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1/*
2 * Copyright (c) 2013, 2021 Johannes Berg <johannes@sipsolutions.net>
3 *
4 * This file is free software: you may copy, redistribute and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation, either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This file is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 *
17 * This file incorporates work covered by the following copyright and
18 * permission notice:
19 *
20 * Copyright (c) 2012 Qualcomm Atheros, Inc.
21 *
22 * Permission to use, copy, modify, and/or distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
27 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
29 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
30 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
31 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
32 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33 */
34
35#include <linux/module.h>
36#include <linux/pci.h>
37#include <linux/interrupt.h>
38#include <linux/ip.h>
39#include <linux/ipv6.h>
40#include <linux/if_vlan.h>
41#include <linux/mdio.h>
42#include <linux/bitops.h>
43#include <linux/netdevice.h>
44#include <linux/etherdevice.h>
45#include <net/ip6_checksum.h>
46#include <linux/crc32.h>
47#include "alx.h"
48#include "hw.h"
49#include "reg.h"
50
51static const char alx_drv_name[] = "alx";
52
53static void alx_free_txbuf(struct alx_tx_queue *txq, int entry)
54{
55 struct alx_buffer *txb = &txq->bufs[entry];
56
57 if (dma_unmap_len(txb, size)) {
58 dma_unmap_single(txq->dev,
59 dma_unmap_addr(txb, dma),
60 dma_unmap_len(txb, size),
61 DMA_TO_DEVICE);
62 dma_unmap_len_set(txb, size, 0);
63 }
64
65 if (txb->skb) {
66 dev_kfree_skb_any(txb->skb);
67 txb->skb = NULL;
68 }
69}
70
71static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp)
72{
73 struct alx_rx_queue *rxq = alx->qnapi[0]->rxq;
74 struct sk_buff *skb;
75 struct alx_buffer *cur_buf;
76 dma_addr_t dma;
77 u16 cur, next, count = 0;
78
79 next = cur = rxq->write_idx;
80 if (++next == alx->rx_ringsz)
81 next = 0;
82 cur_buf = &rxq->bufs[cur];
83
84 while (!cur_buf->skb && next != rxq->read_idx) {
85 struct alx_rfd *rfd = &rxq->rfd[cur];
86
87 /*
88 * When DMA RX address is set to something like
89 * 0x....fc0, it will be very likely to cause DMA
90 * RFD overflow issue.
91 *
92 * To work around it, we apply rx skb with 64 bytes
93 * longer space, and offset the address whenever
94 * 0x....fc0 is detected.
95 */
96 skb = __netdev_alloc_skb(alx->dev, alx->rxbuf_size + 64, gfp);
97 if (!skb)
98 break;
99
100 if (((unsigned long)skb->data & 0xfff) == 0xfc0)
101 skb_reserve(skb, 64);
102
103 dma = dma_map_single(&alx->hw.pdev->dev,
104 skb->data, alx->rxbuf_size,
105 DMA_FROM_DEVICE);
106 if (dma_mapping_error(&alx->hw.pdev->dev, dma)) {
107 dev_kfree_skb(skb);
108 break;
109 }
110
111 /* Unfortunately, RX descriptor buffers must be 4-byte
112 * aligned, so we can't use IP alignment.
113 */
114 if (WARN_ON(dma & 3)) {
115 dev_kfree_skb(skb);
116 break;
117 }
118
119 cur_buf->skb = skb;
120 dma_unmap_len_set(cur_buf, size, alx->rxbuf_size);
121 dma_unmap_addr_set(cur_buf, dma, dma);
122 rfd->addr = cpu_to_le64(dma);
123
124 cur = next;
125 if (++next == alx->rx_ringsz)
126 next = 0;
127 cur_buf = &rxq->bufs[cur];
128 count++;
129 }
130
131 if (count) {
132 /* flush all updates before updating hardware */
133 wmb();
134 rxq->write_idx = cur;
135 alx_write_mem16(&alx->hw, ALX_RFD_PIDX, cur);
136 }
137
138 return count;
139}
140
141static struct alx_tx_queue *alx_tx_queue_mapping(struct alx_priv *alx,
142 struct sk_buff *skb)
143{
144 unsigned int r_idx = skb->queue_mapping;
145
146 if (r_idx >= alx->num_txq)
147 r_idx = r_idx % alx->num_txq;
148
149 return alx->qnapi[r_idx]->txq;
150}
151
152static struct netdev_queue *alx_get_tx_queue(const struct alx_tx_queue *txq)
153{
154 return netdev_get_tx_queue(txq->netdev, txq->queue_idx);
155}
156
157static inline int alx_tpd_avail(struct alx_tx_queue *txq)
158{
159 if (txq->write_idx >= txq->read_idx)
160 return txq->count + txq->read_idx - txq->write_idx - 1;
161 return txq->read_idx - txq->write_idx - 1;
162}
163
164static bool alx_clean_tx_irq(struct alx_tx_queue *txq)
165{
166 struct alx_priv *alx;
167 struct netdev_queue *tx_queue;
168 u16 hw_read_idx, sw_read_idx;
169 unsigned int total_bytes = 0, total_packets = 0;
170 int budget = ALX_DEFAULT_TX_WORK;
171
172 alx = netdev_priv(txq->netdev);
173 tx_queue = alx_get_tx_queue(txq);
174
175 sw_read_idx = txq->read_idx;
176 hw_read_idx = alx_read_mem16(&alx->hw, txq->c_reg);
177
178 if (sw_read_idx != hw_read_idx) {
179 while (sw_read_idx != hw_read_idx && budget > 0) {
180 struct sk_buff *skb;
181
182 skb = txq->bufs[sw_read_idx].skb;
183 if (skb) {
184 total_bytes += skb->len;
185 total_packets++;
186 budget--;
187 }
188
189 alx_free_txbuf(txq, sw_read_idx);
190
191 if (++sw_read_idx == txq->count)
192 sw_read_idx = 0;
193 }
194 txq->read_idx = sw_read_idx;
195
196 netdev_tx_completed_queue(tx_queue, total_packets, total_bytes);
197 }
198
199 if (netif_tx_queue_stopped(tx_queue) && netif_carrier_ok(alx->dev) &&
200 alx_tpd_avail(txq) > txq->count / 4)
201 netif_tx_wake_queue(tx_queue);
202
203 return sw_read_idx == hw_read_idx;
204}
205
206static void alx_schedule_link_check(struct alx_priv *alx)
207{
208 schedule_work(&alx->link_check_wk);
209}
210
211static void alx_schedule_reset(struct alx_priv *alx)
212{
213 schedule_work(&alx->reset_wk);
214}
215
216static int alx_clean_rx_irq(struct alx_rx_queue *rxq, int budget)
217{
218 struct alx_priv *alx;
219 struct alx_rrd *rrd;
220 struct alx_buffer *rxb;
221 struct sk_buff *skb;
222 u16 length, rfd_cleaned = 0;
223 int work = 0;
224
225 alx = netdev_priv(rxq->netdev);
226
227 while (work < budget) {
228 rrd = &rxq->rrd[rxq->rrd_read_idx];
229 if (!(rrd->word3 & cpu_to_le32(1 << RRD_UPDATED_SHIFT)))
230 break;
231 rrd->word3 &= ~cpu_to_le32(1 << RRD_UPDATED_SHIFT);
232
233 if (ALX_GET_FIELD(le32_to_cpu(rrd->word0),
234 RRD_SI) != rxq->read_idx ||
235 ALX_GET_FIELD(le32_to_cpu(rrd->word0),
236 RRD_NOR) != 1) {
237 alx_schedule_reset(alx);
238 return work;
239 }
240
241 rxb = &rxq->bufs[rxq->read_idx];
242 dma_unmap_single(rxq->dev,
243 dma_unmap_addr(rxb, dma),
244 dma_unmap_len(rxb, size),
245 DMA_FROM_DEVICE);
246 dma_unmap_len_set(rxb, size, 0);
247 skb = rxb->skb;
248 rxb->skb = NULL;
249
250 if (rrd->word3 & cpu_to_le32(1 << RRD_ERR_RES_SHIFT) ||
251 rrd->word3 & cpu_to_le32(1 << RRD_ERR_LEN_SHIFT)) {
252 rrd->word3 = 0;
253 dev_kfree_skb_any(skb);
254 goto next_pkt;
255 }
256
257 length = ALX_GET_FIELD(le32_to_cpu(rrd->word3),
258 RRD_PKTLEN) - ETH_FCS_LEN;
259 skb_put(skb, length);
260 skb->protocol = eth_type_trans(skb, rxq->netdev);
261
262 skb_checksum_none_assert(skb);
263 if (alx->dev->features & NETIF_F_RXCSUM &&
264 !(rrd->word3 & (cpu_to_le32(1 << RRD_ERR_L4_SHIFT) |
265 cpu_to_le32(1 << RRD_ERR_IPV4_SHIFT)))) {
266 switch (ALX_GET_FIELD(le32_to_cpu(rrd->word2),
267 RRD_PID)) {
268 case RRD_PID_IPV6UDP:
269 case RRD_PID_IPV4UDP:
270 case RRD_PID_IPV4TCP:
271 case RRD_PID_IPV6TCP:
272 skb->ip_summed = CHECKSUM_UNNECESSARY;
273 break;
274 }
275 }
276
277 napi_gro_receive(&rxq->np->napi, skb);
278 work++;
279
280next_pkt:
281 if (++rxq->read_idx == rxq->count)
282 rxq->read_idx = 0;
283 if (++rxq->rrd_read_idx == rxq->count)
284 rxq->rrd_read_idx = 0;
285
286 if (++rfd_cleaned > ALX_RX_ALLOC_THRESH)
287 rfd_cleaned -= alx_refill_rx_ring(alx, GFP_ATOMIC);
288 }
289
290 if (rfd_cleaned)
291 alx_refill_rx_ring(alx, GFP_ATOMIC);
292
293 return work;
294}
295
296static int alx_poll(struct napi_struct *napi, int budget)
297{
298 struct alx_napi *np = container_of(napi, struct alx_napi, napi);
299 struct alx_priv *alx = np->alx;
300 struct alx_hw *hw = &alx->hw;
301 unsigned long flags;
302 bool tx_complete = true;
303 int work = 0;
304
305 if (np->txq)
306 tx_complete = alx_clean_tx_irq(np->txq);
307 if (np->rxq)
308 work = alx_clean_rx_irq(np->rxq, budget);
309
310 if (!tx_complete || work == budget)
311 return budget;
312
313 napi_complete_done(&np->napi, work);
314
315 /* enable interrupt */
316 if (alx->hw.pdev->msix_enabled) {
317 alx_mask_msix(hw, np->vec_idx, false);
318 } else {
319 spin_lock_irqsave(&alx->irq_lock, flags);
320 alx->int_mask |= ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0;
321 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
322 spin_unlock_irqrestore(&alx->irq_lock, flags);
323 }
324
325 alx_post_write(hw);
326
327 return work;
328}
329
330static bool alx_intr_handle_misc(struct alx_priv *alx, u32 intr)
331{
332 struct alx_hw *hw = &alx->hw;
333
334 if (intr & ALX_ISR_FATAL) {
335 netif_warn(alx, hw, alx->dev,
336 "fatal interrupt 0x%x, resetting\n", intr);
337 alx_schedule_reset(alx);
338 return true;
339 }
340
341 if (intr & ALX_ISR_ALERT)
342 netdev_warn(alx->dev, "alert interrupt: 0x%x\n", intr);
343
344 if (intr & ALX_ISR_PHY) {
345 /* suppress PHY interrupt, because the source
346 * is from PHY internal. only the internal status
347 * is cleared, the interrupt status could be cleared.
348 */
349 alx->int_mask &= ~ALX_ISR_PHY;
350 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
351 alx_schedule_link_check(alx);
352 }
353
354 return false;
355}
356
357static irqreturn_t alx_intr_handle(struct alx_priv *alx, u32 intr)
358{
359 struct alx_hw *hw = &alx->hw;
360
361 spin_lock(&alx->irq_lock);
362
363 /* ACK interrupt */
364 alx_write_mem32(hw, ALX_ISR, intr | ALX_ISR_DIS);
365 intr &= alx->int_mask;
366
367 if (alx_intr_handle_misc(alx, intr))
368 goto out;
369
370 if (intr & (ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0)) {
371 napi_schedule(&alx->qnapi[0]->napi);
372 /* mask rx/tx interrupt, enable them when napi complete */
373 alx->int_mask &= ~ALX_ISR_ALL_QUEUES;
374 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
375 }
376
377 alx_write_mem32(hw, ALX_ISR, 0);
378
379 out:
380 spin_unlock(&alx->irq_lock);
381 return IRQ_HANDLED;
382}
383
384static irqreturn_t alx_intr_msix_ring(int irq, void *data)
385{
386 struct alx_napi *np = data;
387 struct alx_hw *hw = &np->alx->hw;
388
389 /* mask interrupt to ACK chip */
390 alx_mask_msix(hw, np->vec_idx, true);
391 /* clear interrupt status */
392 alx_write_mem32(hw, ALX_ISR, np->vec_mask);
393
394 napi_schedule(&np->napi);
395
396 return IRQ_HANDLED;
397}
398
399static irqreturn_t alx_intr_msix_misc(int irq, void *data)
400{
401 struct alx_priv *alx = data;
402 struct alx_hw *hw = &alx->hw;
403 u32 intr;
404
405 /* mask interrupt to ACK chip */
406 alx_mask_msix(hw, 0, true);
407
408 /* read interrupt status */
409 intr = alx_read_mem32(hw, ALX_ISR);
410 intr &= (alx->int_mask & ~ALX_ISR_ALL_QUEUES);
411
412 if (alx_intr_handle_misc(alx, intr))
413 return IRQ_HANDLED;
414
415 /* clear interrupt status */
416 alx_write_mem32(hw, ALX_ISR, intr);
417
418 /* enable interrupt again */
419 alx_mask_msix(hw, 0, false);
420
421 return IRQ_HANDLED;
422}
423
424static irqreturn_t alx_intr_msi(int irq, void *data)
425{
426 struct alx_priv *alx = data;
427
428 return alx_intr_handle(alx, alx_read_mem32(&alx->hw, ALX_ISR));
429}
430
431static irqreturn_t alx_intr_legacy(int irq, void *data)
432{
433 struct alx_priv *alx = data;
434 struct alx_hw *hw = &alx->hw;
435 u32 intr;
436
437 intr = alx_read_mem32(hw, ALX_ISR);
438
439 if (intr & ALX_ISR_DIS || !(intr & alx->int_mask))
440 return IRQ_NONE;
441
442 return alx_intr_handle(alx, intr);
443}
444
445static const u16 txring_header_reg[] = {ALX_TPD_PRI0_ADDR_LO,
446 ALX_TPD_PRI1_ADDR_LO,
447 ALX_TPD_PRI2_ADDR_LO,
448 ALX_TPD_PRI3_ADDR_LO};
449
450static void alx_init_ring_ptrs(struct alx_priv *alx)
451{
452 struct alx_hw *hw = &alx->hw;
453 u32 addr_hi = ((u64)alx->descmem.dma) >> 32;
454 struct alx_napi *np;
455 int i;
456
457 for (i = 0; i < alx->num_napi; i++) {
458 np = alx->qnapi[i];
459 if (np->txq) {
460 np->txq->read_idx = 0;
461 np->txq->write_idx = 0;
462 alx_write_mem32(hw,
463 txring_header_reg[np->txq->queue_idx],
464 np->txq->tpd_dma);
465 }
466
467 if (np->rxq) {
468 np->rxq->read_idx = 0;
469 np->rxq->write_idx = 0;
470 np->rxq->rrd_read_idx = 0;
471 alx_write_mem32(hw, ALX_RRD_ADDR_LO, np->rxq->rrd_dma);
472 alx_write_mem32(hw, ALX_RFD_ADDR_LO, np->rxq->rfd_dma);
473 }
474 }
475
476 alx_write_mem32(hw, ALX_TX_BASE_ADDR_HI, addr_hi);
477 alx_write_mem32(hw, ALX_TPD_RING_SZ, alx->tx_ringsz);
478
479 alx_write_mem32(hw, ALX_RX_BASE_ADDR_HI, addr_hi);
480 alx_write_mem32(hw, ALX_RRD_RING_SZ, alx->rx_ringsz);
481 alx_write_mem32(hw, ALX_RFD_RING_SZ, alx->rx_ringsz);
482 alx_write_mem32(hw, ALX_RFD_BUF_SZ, alx->rxbuf_size);
483
484 /* load these pointers into the chip */
485 alx_write_mem32(hw, ALX_SRAM9, ALX_SRAM_LOAD_PTR);
486}
487
488static void alx_free_txring_buf(struct alx_tx_queue *txq)
489{
490 int i;
491
492 if (!txq->bufs)
493 return;
494
495 for (i = 0; i < txq->count; i++)
496 alx_free_txbuf(txq, i);
497
498 memset(txq->bufs, 0, txq->count * sizeof(struct alx_buffer));
499 memset(txq->tpd, 0, txq->count * sizeof(struct alx_txd));
500 txq->write_idx = 0;
501 txq->read_idx = 0;
502
503 netdev_tx_reset_queue(alx_get_tx_queue(txq));
504}
505
506static void alx_free_rxring_buf(struct alx_rx_queue *rxq)
507{
508 struct alx_buffer *cur_buf;
509 u16 i;
510
511 if (!rxq->bufs)
512 return;
513
514 for (i = 0; i < rxq->count; i++) {
515 cur_buf = rxq->bufs + i;
516 if (cur_buf->skb) {
517 dma_unmap_single(rxq->dev,
518 dma_unmap_addr(cur_buf, dma),
519 dma_unmap_len(cur_buf, size),
520 DMA_FROM_DEVICE);
521 dev_kfree_skb(cur_buf->skb);
522 cur_buf->skb = NULL;
523 dma_unmap_len_set(cur_buf, size, 0);
524 dma_unmap_addr_set(cur_buf, dma, 0);
525 }
526 }
527
528 rxq->write_idx = 0;
529 rxq->read_idx = 0;
530 rxq->rrd_read_idx = 0;
531}
532
533static void alx_free_buffers(struct alx_priv *alx)
534{
535 int i;
536
537 for (i = 0; i < alx->num_txq; i++)
538 if (alx->qnapi[i] && alx->qnapi[i]->txq)
539 alx_free_txring_buf(alx->qnapi[i]->txq);
540
541 if (alx->qnapi[0] && alx->qnapi[0]->rxq)
542 alx_free_rxring_buf(alx->qnapi[0]->rxq);
543}
544
545static int alx_reinit_rings(struct alx_priv *alx)
546{
547 alx_free_buffers(alx);
548
549 alx_init_ring_ptrs(alx);
550
551 if (!alx_refill_rx_ring(alx, GFP_KERNEL))
552 return -ENOMEM;
553
554 return 0;
555}
556
557static void alx_add_mc_addr(struct alx_hw *hw, const u8 *addr, u32 *mc_hash)
558{
559 u32 crc32, bit, reg;
560
561 crc32 = ether_crc(ETH_ALEN, addr);
562 reg = (crc32 >> 31) & 0x1;
563 bit = (crc32 >> 26) & 0x1F;
564
565 mc_hash[reg] |= BIT(bit);
566}
567
568static void __alx_set_rx_mode(struct net_device *netdev)
569{
570 struct alx_priv *alx = netdev_priv(netdev);
571 struct alx_hw *hw = &alx->hw;
572 struct netdev_hw_addr *ha;
573 u32 mc_hash[2] = {};
574
575 if (!(netdev->flags & IFF_ALLMULTI)) {
576 netdev_for_each_mc_addr(ha, netdev)
577 alx_add_mc_addr(hw, ha->addr, mc_hash);
578
579 alx_write_mem32(hw, ALX_HASH_TBL0, mc_hash[0]);
580 alx_write_mem32(hw, ALX_HASH_TBL1, mc_hash[1]);
581 }
582
583 hw->rx_ctrl &= ~(ALX_MAC_CTRL_MULTIALL_EN | ALX_MAC_CTRL_PROMISC_EN);
584 if (netdev->flags & IFF_PROMISC)
585 hw->rx_ctrl |= ALX_MAC_CTRL_PROMISC_EN;
586 if (netdev->flags & IFF_ALLMULTI)
587 hw->rx_ctrl |= ALX_MAC_CTRL_MULTIALL_EN;
588
589 alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl);
590}
591
592static void alx_set_rx_mode(struct net_device *netdev)
593{
594 __alx_set_rx_mode(netdev);
595}
596
597static int alx_set_mac_address(struct net_device *netdev, void *data)
598{
599 struct alx_priv *alx = netdev_priv(netdev);
600 struct alx_hw *hw = &alx->hw;
601 struct sockaddr *addr = data;
602
603 if (!is_valid_ether_addr(addr->sa_data))
604 return -EADDRNOTAVAIL;
605
606 if (netdev->addr_assign_type & NET_ADDR_RANDOM)
607 netdev->addr_assign_type ^= NET_ADDR_RANDOM;
608
609 eth_hw_addr_set(netdev, addr->sa_data);
610 memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
611 alx_set_macaddr(hw, hw->mac_addr);
612
613 return 0;
614}
615
616static int alx_alloc_tx_ring(struct alx_priv *alx, struct alx_tx_queue *txq,
617 int offset)
618{
619 txq->bufs = kcalloc(txq->count, sizeof(struct alx_buffer), GFP_KERNEL);
620 if (!txq->bufs)
621 return -ENOMEM;
622
623 txq->tpd = alx->descmem.virt + offset;
624 txq->tpd_dma = alx->descmem.dma + offset;
625 offset += sizeof(struct alx_txd) * txq->count;
626
627 return offset;
628}
629
630static int alx_alloc_rx_ring(struct alx_priv *alx, struct alx_rx_queue *rxq,
631 int offset)
632{
633 rxq->bufs = kcalloc(rxq->count, sizeof(struct alx_buffer), GFP_KERNEL);
634 if (!rxq->bufs)
635 return -ENOMEM;
636
637 rxq->rrd = alx->descmem.virt + offset;
638 rxq->rrd_dma = alx->descmem.dma + offset;
639 offset += sizeof(struct alx_rrd) * rxq->count;
640
641 rxq->rfd = alx->descmem.virt + offset;
642 rxq->rfd_dma = alx->descmem.dma + offset;
643 offset += sizeof(struct alx_rfd) * rxq->count;
644
645 return offset;
646}
647
648static int alx_alloc_rings(struct alx_priv *alx)
649{
650 int i, offset = 0;
651
652 /* physical tx/rx ring descriptors
653 *
654 * Allocate them as a single chunk because they must not cross a
655 * 4G boundary (hardware has a single register for high 32 bits
656 * of addresses only)
657 */
658 alx->descmem.size = sizeof(struct alx_txd) * alx->tx_ringsz *
659 alx->num_txq +
660 sizeof(struct alx_rrd) * alx->rx_ringsz +
661 sizeof(struct alx_rfd) * alx->rx_ringsz;
662 alx->descmem.virt = dma_alloc_coherent(&alx->hw.pdev->dev,
663 alx->descmem.size,
664 &alx->descmem.dma, GFP_KERNEL);
665 if (!alx->descmem.virt)
666 return -ENOMEM;
667
668 /* alignment requirements */
669 BUILD_BUG_ON(sizeof(struct alx_txd) % 8);
670 BUILD_BUG_ON(sizeof(struct alx_rrd) % 8);
671
672 for (i = 0; i < alx->num_txq; i++) {
673 offset = alx_alloc_tx_ring(alx, alx->qnapi[i]->txq, offset);
674 if (offset < 0) {
675 netdev_err(alx->dev, "Allocation of tx buffer failed!\n");
676 return -ENOMEM;
677 }
678 }
679
680 offset = alx_alloc_rx_ring(alx, alx->qnapi[0]->rxq, offset);
681 if (offset < 0) {
682 netdev_err(alx->dev, "Allocation of rx buffer failed!\n");
683 return -ENOMEM;
684 }
685
686 return 0;
687}
688
689static void alx_free_rings(struct alx_priv *alx)
690{
691 int i;
692
693 alx_free_buffers(alx);
694
695 for (i = 0; i < alx->num_txq; i++)
696 if (alx->qnapi[i] && alx->qnapi[i]->txq)
697 kfree(alx->qnapi[i]->txq->bufs);
698
699 if (alx->qnapi[0] && alx->qnapi[0]->rxq)
700 kfree(alx->qnapi[0]->rxq->bufs);
701
702 if (alx->descmem.virt)
703 dma_free_coherent(&alx->hw.pdev->dev,
704 alx->descmem.size,
705 alx->descmem.virt,
706 alx->descmem.dma);
707}
708
709static void alx_free_napis(struct alx_priv *alx)
710{
711 struct alx_napi *np;
712 int i;
713
714 for (i = 0; i < alx->num_napi; i++) {
715 np = alx->qnapi[i];
716 if (!np)
717 continue;
718
719 netif_napi_del(&np->napi);
720 kfree(np->txq);
721 kfree(np->rxq);
722 kfree(np);
723 alx->qnapi[i] = NULL;
724 }
725}
726
727static const u16 tx_pidx_reg[] = {ALX_TPD_PRI0_PIDX, ALX_TPD_PRI1_PIDX,
728 ALX_TPD_PRI2_PIDX, ALX_TPD_PRI3_PIDX};
729static const u16 tx_cidx_reg[] = {ALX_TPD_PRI0_CIDX, ALX_TPD_PRI1_CIDX,
730 ALX_TPD_PRI2_CIDX, ALX_TPD_PRI3_CIDX};
731static const u32 tx_vect_mask[] = {ALX_ISR_TX_Q0, ALX_ISR_TX_Q1,
732 ALX_ISR_TX_Q2, ALX_ISR_TX_Q3};
733static const u32 rx_vect_mask[] = {ALX_ISR_RX_Q0, ALX_ISR_RX_Q1,
734 ALX_ISR_RX_Q2, ALX_ISR_RX_Q3,
735 ALX_ISR_RX_Q4, ALX_ISR_RX_Q5,
736 ALX_ISR_RX_Q6, ALX_ISR_RX_Q7};
737
738static int alx_alloc_napis(struct alx_priv *alx)
739{
740 struct alx_napi *np;
741 struct alx_rx_queue *rxq;
742 struct alx_tx_queue *txq;
743 int i;
744
745 alx->int_mask &= ~ALX_ISR_ALL_QUEUES;
746
747 /* allocate alx_napi structures */
748 for (i = 0; i < alx->num_napi; i++) {
749 np = kzalloc(sizeof(struct alx_napi), GFP_KERNEL);
750 if (!np)
751 goto err_out;
752
753 np->alx = alx;
754 netif_napi_add(alx->dev, &np->napi, alx_poll);
755 alx->qnapi[i] = np;
756 }
757
758 /* allocate tx queues */
759 for (i = 0; i < alx->num_txq; i++) {
760 np = alx->qnapi[i];
761 txq = kzalloc(sizeof(*txq), GFP_KERNEL);
762 if (!txq)
763 goto err_out;
764
765 np->txq = txq;
766 txq->p_reg = tx_pidx_reg[i];
767 txq->c_reg = tx_cidx_reg[i];
768 txq->queue_idx = i;
769 txq->count = alx->tx_ringsz;
770 txq->netdev = alx->dev;
771 txq->dev = &alx->hw.pdev->dev;
772 np->vec_mask |= tx_vect_mask[i];
773 alx->int_mask |= tx_vect_mask[i];
774 }
775
776 /* allocate rx queues */
777 np = alx->qnapi[0];
778 rxq = kzalloc(sizeof(*rxq), GFP_KERNEL);
779 if (!rxq)
780 goto err_out;
781
782 np->rxq = rxq;
783 rxq->np = alx->qnapi[0];
784 rxq->queue_idx = 0;
785 rxq->count = alx->rx_ringsz;
786 rxq->netdev = alx->dev;
787 rxq->dev = &alx->hw.pdev->dev;
788 np->vec_mask |= rx_vect_mask[0];
789 alx->int_mask |= rx_vect_mask[0];
790
791 return 0;
792
793err_out:
794 netdev_err(alx->dev, "error allocating internal structures\n");
795 alx_free_napis(alx);
796 return -ENOMEM;
797}
798
799static const int txq_vec_mapping_shift[] = {
800 0, ALX_MSI_MAP_TBL1_TXQ0_SHIFT,
801 0, ALX_MSI_MAP_TBL1_TXQ1_SHIFT,
802 1, ALX_MSI_MAP_TBL2_TXQ2_SHIFT,
803 1, ALX_MSI_MAP_TBL2_TXQ3_SHIFT,
804};
805
806static void alx_config_vector_mapping(struct alx_priv *alx)
807{
808 struct alx_hw *hw = &alx->hw;
809 u32 tbl[2] = {0, 0};
810 int i, vector, idx, shift;
811
812 if (alx->hw.pdev->msix_enabled) {
813 /* tx mappings */
814 for (i = 0, vector = 1; i < alx->num_txq; i++, vector++) {
815 idx = txq_vec_mapping_shift[i * 2];
816 shift = txq_vec_mapping_shift[i * 2 + 1];
817 tbl[idx] |= vector << shift;
818 }
819
820 /* rx mapping */
821 tbl[0] |= 1 << ALX_MSI_MAP_TBL1_RXQ0_SHIFT;
822 }
823
824 alx_write_mem32(hw, ALX_MSI_MAP_TBL1, tbl[0]);
825 alx_write_mem32(hw, ALX_MSI_MAP_TBL2, tbl[1]);
826 alx_write_mem32(hw, ALX_MSI_ID_MAP, 0);
827}
828
829static int alx_enable_msix(struct alx_priv *alx)
830{
831 int err, num_vec, num_txq, num_rxq;
832
833 num_txq = min_t(int, num_online_cpus(), ALX_MAX_TX_QUEUES);
834 num_rxq = 1;
835 num_vec = max_t(int, num_txq, num_rxq) + 1;
836
837 err = pci_alloc_irq_vectors(alx->hw.pdev, num_vec, num_vec,
838 PCI_IRQ_MSIX);
839 if (err < 0) {
840 netdev_warn(alx->dev, "Enabling MSI-X interrupts failed!\n");
841 return err;
842 }
843
844 alx->num_vec = num_vec;
845 alx->num_napi = num_vec - 1;
846 alx->num_txq = num_txq;
847 alx->num_rxq = num_rxq;
848
849 return err;
850}
851
852static int alx_request_msix(struct alx_priv *alx)
853{
854 struct net_device *netdev = alx->dev;
855 int i, err, vector = 0, free_vector = 0;
856
857 err = request_irq(pci_irq_vector(alx->hw.pdev, 0), alx_intr_msix_misc,
858 0, netdev->name, alx);
859 if (err)
860 goto out_err;
861
862 for (i = 0; i < alx->num_napi; i++) {
863 struct alx_napi *np = alx->qnapi[i];
864
865 vector++;
866
867 if (np->txq && np->rxq)
868 sprintf(np->irq_lbl, "%s-TxRx-%u", netdev->name,
869 np->txq->queue_idx);
870 else if (np->txq)
871 sprintf(np->irq_lbl, "%s-tx-%u", netdev->name,
872 np->txq->queue_idx);
873 else if (np->rxq)
874 sprintf(np->irq_lbl, "%s-rx-%u", netdev->name,
875 np->rxq->queue_idx);
876 else
877 sprintf(np->irq_lbl, "%s-unused", netdev->name);
878
879 np->vec_idx = vector;
880 err = request_irq(pci_irq_vector(alx->hw.pdev, vector),
881 alx_intr_msix_ring, 0, np->irq_lbl, np);
882 if (err)
883 goto out_free;
884 }
885 return 0;
886
887out_free:
888 free_irq(pci_irq_vector(alx->hw.pdev, free_vector++), alx);
889
890 vector--;
891 for (i = 0; i < vector; i++)
892 free_irq(pci_irq_vector(alx->hw.pdev,free_vector++),
893 alx->qnapi[i]);
894
895out_err:
896 return err;
897}
898
899static int alx_init_intr(struct alx_priv *alx)
900{
901 int ret;
902
903 ret = pci_alloc_irq_vectors(alx->hw.pdev, 1, 1,
904 PCI_IRQ_MSI | PCI_IRQ_LEGACY);
905 if (ret < 0)
906 return ret;
907
908 alx->num_vec = 1;
909 alx->num_napi = 1;
910 alx->num_txq = 1;
911 alx->num_rxq = 1;
912 return 0;
913}
914
915static void alx_irq_enable(struct alx_priv *alx)
916{
917 struct alx_hw *hw = &alx->hw;
918 int i;
919
920 /* level-1 interrupt switch */
921 alx_write_mem32(hw, ALX_ISR, 0);
922 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
923 alx_post_write(hw);
924
925 if (alx->hw.pdev->msix_enabled) {
926 /* enable all msix irqs */
927 for (i = 0; i < alx->num_vec; i++)
928 alx_mask_msix(hw, i, false);
929 }
930}
931
932static void alx_irq_disable(struct alx_priv *alx)
933{
934 struct alx_hw *hw = &alx->hw;
935 int i;
936
937 alx_write_mem32(hw, ALX_ISR, ALX_ISR_DIS);
938 alx_write_mem32(hw, ALX_IMR, 0);
939 alx_post_write(hw);
940
941 if (alx->hw.pdev->msix_enabled) {
942 for (i = 0; i < alx->num_vec; i++) {
943 alx_mask_msix(hw, i, true);
944 synchronize_irq(pci_irq_vector(alx->hw.pdev, i));
945 }
946 } else {
947 synchronize_irq(pci_irq_vector(alx->hw.pdev, 0));
948 }
949}
950
951static int alx_realloc_resources(struct alx_priv *alx)
952{
953 int err;
954
955 alx_free_rings(alx);
956 alx_free_napis(alx);
957 pci_free_irq_vectors(alx->hw.pdev);
958
959 err = alx_init_intr(alx);
960 if (err)
961 return err;
962
963 err = alx_alloc_napis(alx);
964 if (err)
965 return err;
966
967 err = alx_alloc_rings(alx);
968 if (err)
969 return err;
970
971 return 0;
972}
973
974static int alx_request_irq(struct alx_priv *alx)
975{
976 struct pci_dev *pdev = alx->hw.pdev;
977 struct alx_hw *hw = &alx->hw;
978 int err;
979 u32 msi_ctrl;
980
981 msi_ctrl = (hw->imt >> 1) << ALX_MSI_RETRANS_TM_SHIFT;
982
983 if (alx->hw.pdev->msix_enabled) {
984 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, msi_ctrl);
985 err = alx_request_msix(alx);
986 if (!err)
987 goto out;
988
989 /* msix request failed, realloc resources */
990 err = alx_realloc_resources(alx);
991 if (err)
992 goto out;
993 }
994
995 if (alx->hw.pdev->msi_enabled) {
996 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER,
997 msi_ctrl | ALX_MSI_MASK_SEL_LINE);
998 err = request_irq(pci_irq_vector(pdev, 0), alx_intr_msi, 0,
999 alx->dev->name, alx);
1000 if (!err)
1001 goto out;
1002
1003 /* fall back to legacy interrupt */
1004 pci_free_irq_vectors(alx->hw.pdev);
1005 }
1006
1007 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, 0);
1008 err = request_irq(pci_irq_vector(pdev, 0), alx_intr_legacy, IRQF_SHARED,
1009 alx->dev->name, alx);
1010out:
1011 if (!err)
1012 alx_config_vector_mapping(alx);
1013 else
1014 netdev_err(alx->dev, "IRQ registration failed!\n");
1015 return err;
1016}
1017
1018static void alx_free_irq(struct alx_priv *alx)
1019{
1020 struct pci_dev *pdev = alx->hw.pdev;
1021 int i;
1022
1023 free_irq(pci_irq_vector(pdev, 0), alx);
1024 if (alx->hw.pdev->msix_enabled) {
1025 for (i = 0; i < alx->num_napi; i++)
1026 free_irq(pci_irq_vector(pdev, i + 1), alx->qnapi[i]);
1027 }
1028
1029 pci_free_irq_vectors(pdev);
1030}
1031
1032static int alx_identify_hw(struct alx_priv *alx)
1033{
1034 struct alx_hw *hw = &alx->hw;
1035 int rev = alx_hw_revision(hw);
1036
1037 if (rev > ALX_REV_C0)
1038 return -EINVAL;
1039
1040 hw->max_dma_chnl = rev >= ALX_REV_B0 ? 4 : 2;
1041
1042 return 0;
1043}
1044
1045static int alx_init_sw(struct alx_priv *alx)
1046{
1047 struct pci_dev *pdev = alx->hw.pdev;
1048 struct alx_hw *hw = &alx->hw;
1049 int err;
1050
1051 err = alx_identify_hw(alx);
1052 if (err) {
1053 dev_err(&pdev->dev, "unrecognized chip, aborting\n");
1054 return err;
1055 }
1056
1057 alx->hw.lnk_patch =
1058 pdev->device == ALX_DEV_ID_AR8161 &&
1059 pdev->subsystem_vendor == PCI_VENDOR_ID_ATTANSIC &&
1060 pdev->subsystem_device == 0x0091 &&
1061 pdev->revision == 0;
1062
1063 hw->smb_timer = 400;
1064 hw->mtu = alx->dev->mtu;
1065 alx->rxbuf_size = ALX_MAX_FRAME_LEN(hw->mtu);
1066 /* MTU range: 34 - 9256 */
1067 alx->dev->min_mtu = 34;
1068 alx->dev->max_mtu = ALX_MAX_FRAME_LEN(ALX_MAX_FRAME_SIZE);
1069 alx->tx_ringsz = 256;
1070 alx->rx_ringsz = 512;
1071 hw->imt = 200;
1072 alx->int_mask = ALX_ISR_MISC;
1073 hw->dma_chnl = hw->max_dma_chnl;
1074 hw->ith_tpd = alx->tx_ringsz / 3;
1075 hw->link_speed = SPEED_UNKNOWN;
1076 hw->duplex = DUPLEX_UNKNOWN;
1077 hw->adv_cfg = ADVERTISED_Autoneg |
1078 ADVERTISED_10baseT_Half |
1079 ADVERTISED_10baseT_Full |
1080 ADVERTISED_100baseT_Full |
1081 ADVERTISED_100baseT_Half |
1082 ADVERTISED_1000baseT_Full;
1083 hw->flowctrl = ALX_FC_ANEG | ALX_FC_RX | ALX_FC_TX;
1084
1085 hw->rx_ctrl = ALX_MAC_CTRL_WOLSPED_SWEN |
1086 ALX_MAC_CTRL_MHASH_ALG_HI5B |
1087 ALX_MAC_CTRL_BRD_EN |
1088 ALX_MAC_CTRL_PCRCE |
1089 ALX_MAC_CTRL_CRCE |
1090 ALX_MAC_CTRL_RXFC_EN |
1091 ALX_MAC_CTRL_TXFC_EN |
1092 7 << ALX_MAC_CTRL_PRMBLEN_SHIFT;
1093 mutex_init(&alx->mtx);
1094
1095 return 0;
1096}
1097
1098
1099static netdev_features_t alx_fix_features(struct net_device *netdev,
1100 netdev_features_t features)
1101{
1102 if (netdev->mtu > ALX_MAX_TSO_PKT_SIZE)
1103 features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
1104
1105 return features;
1106}
1107
1108static void alx_netif_stop(struct alx_priv *alx)
1109{
1110 int i;
1111
1112 netif_trans_update(alx->dev);
1113 if (netif_carrier_ok(alx->dev)) {
1114 netif_carrier_off(alx->dev);
1115 netif_tx_disable(alx->dev);
1116 for (i = 0; i < alx->num_napi; i++)
1117 napi_disable(&alx->qnapi[i]->napi);
1118 }
1119}
1120
1121static void alx_halt(struct alx_priv *alx)
1122{
1123 struct alx_hw *hw = &alx->hw;
1124
1125 lockdep_assert_held(&alx->mtx);
1126
1127 alx_netif_stop(alx);
1128 hw->link_speed = SPEED_UNKNOWN;
1129 hw->duplex = DUPLEX_UNKNOWN;
1130
1131 alx_reset_mac(hw);
1132
1133 /* disable l0s/l1 */
1134 alx_enable_aspm(hw, false, false);
1135 alx_irq_disable(alx);
1136 alx_free_buffers(alx);
1137}
1138
1139static void alx_configure(struct alx_priv *alx)
1140{
1141 struct alx_hw *hw = &alx->hw;
1142
1143 alx_configure_basic(hw);
1144 alx_disable_rss(hw);
1145 __alx_set_rx_mode(alx->dev);
1146
1147 alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl);
1148}
1149
1150static void alx_activate(struct alx_priv *alx)
1151{
1152 lockdep_assert_held(&alx->mtx);
1153
1154 /* hardware setting lost, restore it */
1155 alx_reinit_rings(alx);
1156 alx_configure(alx);
1157
1158 /* clear old interrupts */
1159 alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS);
1160
1161 alx_irq_enable(alx);
1162
1163 alx_schedule_link_check(alx);
1164}
1165
1166static void alx_reinit(struct alx_priv *alx)
1167{
1168 lockdep_assert_held(&alx->mtx);
1169
1170 alx_halt(alx);
1171 alx_activate(alx);
1172}
1173
1174static int alx_change_mtu(struct net_device *netdev, int mtu)
1175{
1176 struct alx_priv *alx = netdev_priv(netdev);
1177 int max_frame = ALX_MAX_FRAME_LEN(mtu);
1178
1179 netdev->mtu = mtu;
1180 alx->hw.mtu = mtu;
1181 alx->rxbuf_size = max(max_frame, ALX_DEF_RXBUF_SIZE);
1182 netdev_update_features(netdev);
1183 if (netif_running(netdev)) {
1184 mutex_lock(&alx->mtx);
1185 alx_reinit(alx);
1186 mutex_unlock(&alx->mtx);
1187 }
1188 return 0;
1189}
1190
1191static void alx_netif_start(struct alx_priv *alx)
1192{
1193 int i;
1194
1195 netif_tx_wake_all_queues(alx->dev);
1196 for (i = 0; i < alx->num_napi; i++)
1197 napi_enable(&alx->qnapi[i]->napi);
1198 netif_carrier_on(alx->dev);
1199}
1200
1201static int __alx_open(struct alx_priv *alx, bool resume)
1202{
1203 int err;
1204
1205 err = alx_enable_msix(alx);
1206 if (err < 0) {
1207 err = alx_init_intr(alx);
1208 if (err)
1209 return err;
1210 }
1211
1212 if (!resume)
1213 netif_carrier_off(alx->dev);
1214
1215 err = alx_alloc_napis(alx);
1216 if (err)
1217 goto out_disable_adv_intr;
1218
1219 err = alx_alloc_rings(alx);
1220 if (err)
1221 goto out_free_rings;
1222
1223 alx_configure(alx);
1224
1225 err = alx_request_irq(alx);
1226 if (err)
1227 goto out_free_rings;
1228
1229 /* must be called after alx_request_irq because the chip stops working
1230 * if we copy the dma addresses in alx_init_ring_ptrs twice when
1231 * requesting msi-x interrupts failed
1232 */
1233 alx_reinit_rings(alx);
1234
1235 netif_set_real_num_tx_queues(alx->dev, alx->num_txq);
1236 netif_set_real_num_rx_queues(alx->dev, alx->num_rxq);
1237
1238 /* clear old interrupts */
1239 alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS);
1240
1241 alx_irq_enable(alx);
1242
1243 if (!resume)
1244 netif_tx_start_all_queues(alx->dev);
1245
1246 alx_schedule_link_check(alx);
1247 return 0;
1248
1249out_free_rings:
1250 alx_free_rings(alx);
1251 alx_free_napis(alx);
1252out_disable_adv_intr:
1253 pci_free_irq_vectors(alx->hw.pdev);
1254 return err;
1255}
1256
1257static void __alx_stop(struct alx_priv *alx)
1258{
1259 lockdep_assert_held(&alx->mtx);
1260
1261 alx_free_irq(alx);
1262
1263 cancel_work_sync(&alx->link_check_wk);
1264 cancel_work_sync(&alx->reset_wk);
1265
1266 alx_halt(alx);
1267 alx_free_rings(alx);
1268 alx_free_napis(alx);
1269}
1270
1271static const char *alx_speed_desc(struct alx_hw *hw)
1272{
1273 switch (alx_speed_to_ethadv(hw->link_speed, hw->duplex)) {
1274 case ADVERTISED_1000baseT_Full:
1275 return "1 Gbps Full";
1276 case ADVERTISED_100baseT_Full:
1277 return "100 Mbps Full";
1278 case ADVERTISED_100baseT_Half:
1279 return "100 Mbps Half";
1280 case ADVERTISED_10baseT_Full:
1281 return "10 Mbps Full";
1282 case ADVERTISED_10baseT_Half:
1283 return "10 Mbps Half";
1284 default:
1285 return "Unknown speed";
1286 }
1287}
1288
1289static void alx_check_link(struct alx_priv *alx)
1290{
1291 struct alx_hw *hw = &alx->hw;
1292 unsigned long flags;
1293 int old_speed;
1294 int err;
1295
1296 lockdep_assert_held(&alx->mtx);
1297
1298 /* clear PHY internal interrupt status, otherwise the main
1299 * interrupt status will be asserted forever
1300 */
1301 alx_clear_phy_intr(hw);
1302
1303 old_speed = hw->link_speed;
1304 err = alx_read_phy_link(hw);
1305 if (err < 0)
1306 goto reset;
1307
1308 spin_lock_irqsave(&alx->irq_lock, flags);
1309 alx->int_mask |= ALX_ISR_PHY;
1310 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
1311 spin_unlock_irqrestore(&alx->irq_lock, flags);
1312
1313 if (old_speed == hw->link_speed)
1314 return;
1315
1316 if (hw->link_speed != SPEED_UNKNOWN) {
1317 netif_info(alx, link, alx->dev,
1318 "NIC Up: %s\n", alx_speed_desc(hw));
1319 alx_post_phy_link(hw);
1320 alx_enable_aspm(hw, true, true);
1321 alx_start_mac(hw);
1322
1323 if (old_speed == SPEED_UNKNOWN)
1324 alx_netif_start(alx);
1325 } else {
1326 /* link is now down */
1327 alx_netif_stop(alx);
1328 netif_info(alx, link, alx->dev, "Link Down\n");
1329 err = alx_reset_mac(hw);
1330 if (err)
1331 goto reset;
1332 alx_irq_disable(alx);
1333
1334 /* MAC reset causes all HW settings to be lost, restore all */
1335 err = alx_reinit_rings(alx);
1336 if (err)
1337 goto reset;
1338 alx_configure(alx);
1339 alx_enable_aspm(hw, false, true);
1340 alx_post_phy_link(hw);
1341 alx_irq_enable(alx);
1342 }
1343
1344 return;
1345
1346reset:
1347 alx_schedule_reset(alx);
1348}
1349
1350static int alx_open(struct net_device *netdev)
1351{
1352 struct alx_priv *alx = netdev_priv(netdev);
1353 int ret;
1354
1355 mutex_lock(&alx->mtx);
1356 ret = __alx_open(alx, false);
1357 mutex_unlock(&alx->mtx);
1358
1359 return ret;
1360}
1361
1362static int alx_stop(struct net_device *netdev)
1363{
1364 struct alx_priv *alx = netdev_priv(netdev);
1365
1366 mutex_lock(&alx->mtx);
1367 __alx_stop(alx);
1368 mutex_unlock(&alx->mtx);
1369
1370 return 0;
1371}
1372
1373static void alx_link_check(struct work_struct *work)
1374{
1375 struct alx_priv *alx;
1376
1377 alx = container_of(work, struct alx_priv, link_check_wk);
1378
1379 mutex_lock(&alx->mtx);
1380 alx_check_link(alx);
1381 mutex_unlock(&alx->mtx);
1382}
1383
1384static void alx_reset(struct work_struct *work)
1385{
1386 struct alx_priv *alx = container_of(work, struct alx_priv, reset_wk);
1387
1388 mutex_lock(&alx->mtx);
1389 alx_reinit(alx);
1390 mutex_unlock(&alx->mtx);
1391}
1392
1393static int alx_tpd_req(struct sk_buff *skb)
1394{
1395 int num;
1396
1397 num = skb_shinfo(skb)->nr_frags + 1;
1398 /* we need one extra descriptor for LSOv2 */
1399 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1400 num++;
1401
1402 return num;
1403}
1404
1405static int alx_tx_csum(struct sk_buff *skb, struct alx_txd *first)
1406{
1407 u8 cso, css;
1408
1409 if (skb->ip_summed != CHECKSUM_PARTIAL)
1410 return 0;
1411
1412 cso = skb_checksum_start_offset(skb);
1413 if (cso & 1)
1414 return -EINVAL;
1415
1416 css = cso + skb->csum_offset;
1417 first->word1 |= cpu_to_le32((cso >> 1) << TPD_CXSUMSTART_SHIFT);
1418 first->word1 |= cpu_to_le32((css >> 1) << TPD_CXSUMOFFSET_SHIFT);
1419 first->word1 |= cpu_to_le32(1 << TPD_CXSUM_EN_SHIFT);
1420
1421 return 0;
1422}
1423
1424static int alx_tso(struct sk_buff *skb, struct alx_txd *first)
1425{
1426 int err;
1427
1428 if (skb->ip_summed != CHECKSUM_PARTIAL)
1429 return 0;
1430
1431 if (!skb_is_gso(skb))
1432 return 0;
1433
1434 err = skb_cow_head(skb, 0);
1435 if (err < 0)
1436 return err;
1437
1438 if (skb->protocol == htons(ETH_P_IP)) {
1439 struct iphdr *iph = ip_hdr(skb);
1440
1441 iph->check = 0;
1442 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
1443 0, IPPROTO_TCP, 0);
1444 first->word1 |= 1 << TPD_IPV4_SHIFT;
1445 } else if (skb_is_gso_v6(skb)) {
1446 tcp_v6_gso_csum_prep(skb);
1447 /* LSOv2: the first TPD only provides the packet length */
1448 first->adrl.l.pkt_len = skb->len;
1449 first->word1 |= 1 << TPD_LSO_V2_SHIFT;
1450 }
1451
1452 first->word1 |= 1 << TPD_LSO_EN_SHIFT;
1453 first->word1 |= (skb_transport_offset(skb) &
1454 TPD_L4HDROFFSET_MASK) << TPD_L4HDROFFSET_SHIFT;
1455 first->word1 |= (skb_shinfo(skb)->gso_size &
1456 TPD_MSS_MASK) << TPD_MSS_SHIFT;
1457 return 1;
1458}
1459
1460static int alx_map_tx_skb(struct alx_tx_queue *txq, struct sk_buff *skb)
1461{
1462 struct alx_txd *tpd, *first_tpd;
1463 dma_addr_t dma;
1464 int maplen, f, first_idx = txq->write_idx;
1465
1466 first_tpd = &txq->tpd[txq->write_idx];
1467 tpd = first_tpd;
1468
1469 if (tpd->word1 & (1 << TPD_LSO_V2_SHIFT)) {
1470 if (++txq->write_idx == txq->count)
1471 txq->write_idx = 0;
1472
1473 tpd = &txq->tpd[txq->write_idx];
1474 tpd->len = first_tpd->len;
1475 tpd->vlan_tag = first_tpd->vlan_tag;
1476 tpd->word1 = first_tpd->word1;
1477 }
1478
1479 maplen = skb_headlen(skb);
1480 dma = dma_map_single(txq->dev, skb->data, maplen,
1481 DMA_TO_DEVICE);
1482 if (dma_mapping_error(txq->dev, dma))
1483 goto err_dma;
1484
1485 dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen);
1486 dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma);
1487
1488 tpd->adrl.addr = cpu_to_le64(dma);
1489 tpd->len = cpu_to_le16(maplen);
1490
1491 for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
1492 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1493
1494 if (++txq->write_idx == txq->count)
1495 txq->write_idx = 0;
1496 tpd = &txq->tpd[txq->write_idx];
1497
1498 tpd->word1 = first_tpd->word1;
1499
1500 maplen = skb_frag_size(frag);
1501 dma = skb_frag_dma_map(txq->dev, frag, 0,
1502 maplen, DMA_TO_DEVICE);
1503 if (dma_mapping_error(txq->dev, dma))
1504 goto err_dma;
1505 dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen);
1506 dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma);
1507
1508 tpd->adrl.addr = cpu_to_le64(dma);
1509 tpd->len = cpu_to_le16(maplen);
1510 }
1511
1512 /* last TPD, set EOP flag and store skb */
1513 tpd->word1 |= cpu_to_le32(1 << TPD_EOP_SHIFT);
1514 txq->bufs[txq->write_idx].skb = skb;
1515
1516 if (++txq->write_idx == txq->count)
1517 txq->write_idx = 0;
1518
1519 return 0;
1520
1521err_dma:
1522 f = first_idx;
1523 while (f != txq->write_idx) {
1524 alx_free_txbuf(txq, f);
1525 if (++f == txq->count)
1526 f = 0;
1527 }
1528 return -ENOMEM;
1529}
1530
1531static netdev_tx_t alx_start_xmit_ring(struct sk_buff *skb,
1532 struct alx_tx_queue *txq)
1533{
1534 struct alx_priv *alx;
1535 struct alx_txd *first;
1536 int tso;
1537
1538 alx = netdev_priv(txq->netdev);
1539
1540 if (alx_tpd_avail(txq) < alx_tpd_req(skb)) {
1541 netif_tx_stop_queue(alx_get_tx_queue(txq));
1542 goto drop;
1543 }
1544
1545 first = &txq->tpd[txq->write_idx];
1546 memset(first, 0, sizeof(*first));
1547
1548 tso = alx_tso(skb, first);
1549 if (tso < 0)
1550 goto drop;
1551 else if (!tso && alx_tx_csum(skb, first))
1552 goto drop;
1553
1554 if (alx_map_tx_skb(txq, skb) < 0)
1555 goto drop;
1556
1557 netdev_tx_sent_queue(alx_get_tx_queue(txq), skb->len);
1558
1559 /* flush updates before updating hardware */
1560 wmb();
1561 alx_write_mem16(&alx->hw, txq->p_reg, txq->write_idx);
1562
1563 if (alx_tpd_avail(txq) < txq->count / 8)
1564 netif_tx_stop_queue(alx_get_tx_queue(txq));
1565
1566 return NETDEV_TX_OK;
1567
1568drop:
1569 dev_kfree_skb_any(skb);
1570 return NETDEV_TX_OK;
1571}
1572
1573static netdev_tx_t alx_start_xmit(struct sk_buff *skb,
1574 struct net_device *netdev)
1575{
1576 struct alx_priv *alx = netdev_priv(netdev);
1577 return alx_start_xmit_ring(skb, alx_tx_queue_mapping(alx, skb));
1578}
1579
1580static void alx_tx_timeout(struct net_device *dev, unsigned int txqueue)
1581{
1582 struct alx_priv *alx = netdev_priv(dev);
1583
1584 alx_schedule_reset(alx);
1585}
1586
1587static int alx_mdio_read(struct net_device *netdev,
1588 int prtad, int devad, u16 addr)
1589{
1590 struct alx_priv *alx = netdev_priv(netdev);
1591 struct alx_hw *hw = &alx->hw;
1592 u16 val;
1593 int err;
1594
1595 if (prtad != hw->mdio.prtad)
1596 return -EINVAL;
1597
1598 if (devad == MDIO_DEVAD_NONE)
1599 err = alx_read_phy_reg(hw, addr, &val);
1600 else
1601 err = alx_read_phy_ext(hw, devad, addr, &val);
1602
1603 if (err)
1604 return err;
1605 return val;
1606}
1607
1608static int alx_mdio_write(struct net_device *netdev,
1609 int prtad, int devad, u16 addr, u16 val)
1610{
1611 struct alx_priv *alx = netdev_priv(netdev);
1612 struct alx_hw *hw = &alx->hw;
1613
1614 if (prtad != hw->mdio.prtad)
1615 return -EINVAL;
1616
1617 if (devad == MDIO_DEVAD_NONE)
1618 return alx_write_phy_reg(hw, addr, val);
1619
1620 return alx_write_phy_ext(hw, devad, addr, val);
1621}
1622
1623static int alx_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1624{
1625 struct alx_priv *alx = netdev_priv(netdev);
1626
1627 if (!netif_running(netdev))
1628 return -EAGAIN;
1629
1630 return mdio_mii_ioctl(&alx->hw.mdio, if_mii(ifr), cmd);
1631}
1632
1633#ifdef CONFIG_NET_POLL_CONTROLLER
1634static void alx_poll_controller(struct net_device *netdev)
1635{
1636 struct alx_priv *alx = netdev_priv(netdev);
1637 int i;
1638
1639 if (alx->hw.pdev->msix_enabled) {
1640 alx_intr_msix_misc(0, alx);
1641 for (i = 0; i < alx->num_txq; i++)
1642 alx_intr_msix_ring(0, alx->qnapi[i]);
1643 } else if (alx->hw.pdev->msi_enabled)
1644 alx_intr_msi(0, alx);
1645 else
1646 alx_intr_legacy(0, alx);
1647}
1648#endif
1649
1650static void alx_get_stats64(struct net_device *dev,
1651 struct rtnl_link_stats64 *net_stats)
1652{
1653 struct alx_priv *alx = netdev_priv(dev);
1654 struct alx_hw_stats *hw_stats = &alx->hw.stats;
1655
1656 spin_lock(&alx->stats_lock);
1657
1658 alx_update_hw_stats(&alx->hw);
1659
1660 net_stats->tx_bytes = hw_stats->tx_byte_cnt;
1661 net_stats->rx_bytes = hw_stats->rx_byte_cnt;
1662 net_stats->multicast = hw_stats->rx_mcast;
1663 net_stats->collisions = hw_stats->tx_single_col +
1664 hw_stats->tx_multi_col +
1665 hw_stats->tx_late_col +
1666 hw_stats->tx_abort_col;
1667
1668 net_stats->rx_errors = hw_stats->rx_frag +
1669 hw_stats->rx_fcs_err +
1670 hw_stats->rx_len_err +
1671 hw_stats->rx_ov_sz +
1672 hw_stats->rx_ov_rrd +
1673 hw_stats->rx_align_err +
1674 hw_stats->rx_ov_rxf;
1675
1676 net_stats->rx_fifo_errors = hw_stats->rx_ov_rxf;
1677 net_stats->rx_length_errors = hw_stats->rx_len_err;
1678 net_stats->rx_crc_errors = hw_stats->rx_fcs_err;
1679 net_stats->rx_frame_errors = hw_stats->rx_align_err;
1680 net_stats->rx_dropped = hw_stats->rx_ov_rrd;
1681
1682 net_stats->tx_errors = hw_stats->tx_late_col +
1683 hw_stats->tx_abort_col +
1684 hw_stats->tx_underrun +
1685 hw_stats->tx_trunc;
1686
1687 net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1688 net_stats->tx_fifo_errors = hw_stats->tx_underrun;
1689 net_stats->tx_window_errors = hw_stats->tx_late_col;
1690
1691 net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;
1692 net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
1693
1694 spin_unlock(&alx->stats_lock);
1695}
1696
1697static const struct net_device_ops alx_netdev_ops = {
1698 .ndo_open = alx_open,
1699 .ndo_stop = alx_stop,
1700 .ndo_start_xmit = alx_start_xmit,
1701 .ndo_get_stats64 = alx_get_stats64,
1702 .ndo_set_rx_mode = alx_set_rx_mode,
1703 .ndo_validate_addr = eth_validate_addr,
1704 .ndo_set_mac_address = alx_set_mac_address,
1705 .ndo_change_mtu = alx_change_mtu,
1706 .ndo_eth_ioctl = alx_ioctl,
1707 .ndo_tx_timeout = alx_tx_timeout,
1708 .ndo_fix_features = alx_fix_features,
1709#ifdef CONFIG_NET_POLL_CONTROLLER
1710 .ndo_poll_controller = alx_poll_controller,
1711#endif
1712};
1713
1714static int alx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1715{
1716 struct net_device *netdev;
1717 struct alx_priv *alx;
1718 struct alx_hw *hw;
1719 bool phy_configured;
1720 int err;
1721
1722 err = pci_enable_device_mem(pdev);
1723 if (err)
1724 return err;
1725
1726 /* The alx chip can DMA to 64-bit addresses, but it uses a single
1727 * shared register for the high 32 bits, so only a single, aligned,
1728 * 4 GB physical address range can be used for descriptors.
1729 */
1730 if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
1731 dev_dbg(&pdev->dev, "DMA to 64-BIT addresses\n");
1732 } else {
1733 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
1734 if (err) {
1735 dev_err(&pdev->dev, "No usable DMA config, aborting\n");
1736 goto out_pci_disable;
1737 }
1738 }
1739
1740 err = pci_request_mem_regions(pdev, alx_drv_name);
1741 if (err) {
1742 dev_err(&pdev->dev,
1743 "pci_request_mem_regions failed\n");
1744 goto out_pci_disable;
1745 }
1746
1747 pci_set_master(pdev);
1748
1749 if (!pdev->pm_cap) {
1750 dev_err(&pdev->dev,
1751 "Can't find power management capability, aborting\n");
1752 err = -EIO;
1753 goto out_pci_release;
1754 }
1755
1756 netdev = alloc_etherdev_mqs(sizeof(*alx),
1757 ALX_MAX_TX_QUEUES, 1);
1758 if (!netdev) {
1759 err = -ENOMEM;
1760 goto out_pci_release;
1761 }
1762
1763 SET_NETDEV_DEV(netdev, &pdev->dev);
1764 alx = netdev_priv(netdev);
1765 spin_lock_init(&alx->hw.mdio_lock);
1766 spin_lock_init(&alx->irq_lock);
1767 spin_lock_init(&alx->stats_lock);
1768 alx->dev = netdev;
1769 alx->hw.pdev = pdev;
1770 alx->msg_enable = NETIF_MSG_LINK | NETIF_MSG_HW | NETIF_MSG_IFUP |
1771 NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR | NETIF_MSG_WOL;
1772 hw = &alx->hw;
1773 pci_set_drvdata(pdev, alx);
1774
1775 hw->hw_addr = pci_ioremap_bar(pdev, 0);
1776 if (!hw->hw_addr) {
1777 dev_err(&pdev->dev, "cannot map device registers\n");
1778 err = -EIO;
1779 goto out_free_netdev;
1780 }
1781
1782 netdev->netdev_ops = &alx_netdev_ops;
1783 netdev->ethtool_ops = &alx_ethtool_ops;
1784 netdev->irq = pci_irq_vector(pdev, 0);
1785 netdev->watchdog_timeo = ALX_WATCHDOG_TIME;
1786
1787 if (ent->driver_data & ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG)
1788 pdev->dev_flags |= PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG;
1789
1790 err = alx_init_sw(alx);
1791 if (err) {
1792 dev_err(&pdev->dev, "net device private data init failed\n");
1793 goto out_unmap;
1794 }
1795
1796 mutex_lock(&alx->mtx);
1797
1798 alx_reset_pcie(hw);
1799
1800 phy_configured = alx_phy_configured(hw);
1801
1802 if (!phy_configured)
1803 alx_reset_phy(hw);
1804
1805 err = alx_reset_mac(hw);
1806 if (err) {
1807 dev_err(&pdev->dev, "MAC Reset failed, error = %d\n", err);
1808 goto out_unlock;
1809 }
1810
1811 /* setup link to put it in a known good starting state */
1812 if (!phy_configured) {
1813 err = alx_setup_speed_duplex(hw, hw->adv_cfg, hw->flowctrl);
1814 if (err) {
1815 dev_err(&pdev->dev,
1816 "failed to configure PHY speed/duplex (err=%d)\n",
1817 err);
1818 goto out_unlock;
1819 }
1820 }
1821
1822 netdev->hw_features = NETIF_F_SG |
1823 NETIF_F_HW_CSUM |
1824 NETIF_F_RXCSUM |
1825 NETIF_F_TSO |
1826 NETIF_F_TSO6;
1827
1828 if (alx_get_perm_macaddr(hw, hw->perm_addr)) {
1829 dev_warn(&pdev->dev,
1830 "Invalid permanent address programmed, using random one\n");
1831 eth_hw_addr_random(netdev);
1832 memcpy(hw->perm_addr, netdev->dev_addr, netdev->addr_len);
1833 }
1834
1835 memcpy(hw->mac_addr, hw->perm_addr, ETH_ALEN);
1836 eth_hw_addr_set(netdev, hw->mac_addr);
1837 memcpy(netdev->perm_addr, hw->perm_addr, ETH_ALEN);
1838
1839 hw->mdio.prtad = 0;
1840 hw->mdio.mmds = 0;
1841 hw->mdio.dev = netdev;
1842 hw->mdio.mode_support = MDIO_SUPPORTS_C45 |
1843 MDIO_SUPPORTS_C22 |
1844 MDIO_EMULATE_C22;
1845 hw->mdio.mdio_read = alx_mdio_read;
1846 hw->mdio.mdio_write = alx_mdio_write;
1847
1848 if (!alx_get_phy_info(hw)) {
1849 dev_err(&pdev->dev, "failed to identify PHY\n");
1850 err = -EIO;
1851 goto out_unlock;
1852 }
1853
1854 mutex_unlock(&alx->mtx);
1855
1856 INIT_WORK(&alx->link_check_wk, alx_link_check);
1857 INIT_WORK(&alx->reset_wk, alx_reset);
1858 netif_carrier_off(netdev);
1859
1860 err = register_netdev(netdev);
1861 if (err) {
1862 dev_err(&pdev->dev, "register netdevice failed\n");
1863 goto out_unmap;
1864 }
1865
1866 netdev_info(netdev,
1867 "Qualcomm Atheros AR816x/AR817x Ethernet [%pM]\n",
1868 netdev->dev_addr);
1869
1870 return 0;
1871
1872out_unlock:
1873 mutex_unlock(&alx->mtx);
1874out_unmap:
1875 iounmap(hw->hw_addr);
1876out_free_netdev:
1877 free_netdev(netdev);
1878out_pci_release:
1879 pci_release_mem_regions(pdev);
1880out_pci_disable:
1881 pci_disable_device(pdev);
1882 return err;
1883}
1884
1885static void alx_remove(struct pci_dev *pdev)
1886{
1887 struct alx_priv *alx = pci_get_drvdata(pdev);
1888 struct alx_hw *hw = &alx->hw;
1889
1890 /* restore permanent mac address */
1891 alx_set_macaddr(hw, hw->perm_addr);
1892
1893 unregister_netdev(alx->dev);
1894 iounmap(hw->hw_addr);
1895 pci_release_mem_regions(pdev);
1896
1897 pci_disable_device(pdev);
1898
1899 mutex_destroy(&alx->mtx);
1900
1901 free_netdev(alx->dev);
1902}
1903
1904static int alx_suspend(struct device *dev)
1905{
1906 struct alx_priv *alx = dev_get_drvdata(dev);
1907
1908 if (!netif_running(alx->dev))
1909 return 0;
1910
1911 rtnl_lock();
1912 netif_device_detach(alx->dev);
1913
1914 mutex_lock(&alx->mtx);
1915 __alx_stop(alx);
1916 mutex_unlock(&alx->mtx);
1917 rtnl_unlock();
1918
1919 return 0;
1920}
1921
1922static int alx_resume(struct device *dev)
1923{
1924 struct alx_priv *alx = dev_get_drvdata(dev);
1925 struct alx_hw *hw = &alx->hw;
1926 int err;
1927
1928 rtnl_lock();
1929 mutex_lock(&alx->mtx);
1930 alx_reset_phy(hw);
1931
1932 if (!netif_running(alx->dev)) {
1933 err = 0;
1934 goto unlock;
1935 }
1936
1937 err = __alx_open(alx, true);
1938 if (err)
1939 goto unlock;
1940
1941 netif_device_attach(alx->dev);
1942
1943unlock:
1944 mutex_unlock(&alx->mtx);
1945 rtnl_unlock();
1946 return err;
1947}
1948
1949static DEFINE_SIMPLE_DEV_PM_OPS(alx_pm_ops, alx_suspend, alx_resume);
1950
1951static pci_ers_result_t alx_pci_error_detected(struct pci_dev *pdev,
1952 pci_channel_state_t state)
1953{
1954 struct alx_priv *alx = pci_get_drvdata(pdev);
1955 struct net_device *netdev = alx->dev;
1956 pci_ers_result_t rc = PCI_ERS_RESULT_NEED_RESET;
1957
1958 dev_info(&pdev->dev, "pci error detected\n");
1959
1960 mutex_lock(&alx->mtx);
1961
1962 if (netif_running(netdev)) {
1963 netif_device_detach(netdev);
1964 alx_halt(alx);
1965 }
1966
1967 if (state == pci_channel_io_perm_failure)
1968 rc = PCI_ERS_RESULT_DISCONNECT;
1969 else
1970 pci_disable_device(pdev);
1971
1972 mutex_unlock(&alx->mtx);
1973
1974 return rc;
1975}
1976
1977static pci_ers_result_t alx_pci_error_slot_reset(struct pci_dev *pdev)
1978{
1979 struct alx_priv *alx = pci_get_drvdata(pdev);
1980 struct alx_hw *hw = &alx->hw;
1981 pci_ers_result_t rc = PCI_ERS_RESULT_DISCONNECT;
1982
1983 dev_info(&pdev->dev, "pci error slot reset\n");
1984
1985 mutex_lock(&alx->mtx);
1986
1987 if (pci_enable_device(pdev)) {
1988 dev_err(&pdev->dev, "Failed to re-enable PCI device after reset\n");
1989 goto out;
1990 }
1991
1992 pci_set_master(pdev);
1993
1994 alx_reset_pcie(hw);
1995 if (!alx_reset_mac(hw))
1996 rc = PCI_ERS_RESULT_RECOVERED;
1997out:
1998 mutex_unlock(&alx->mtx);
1999
2000 return rc;
2001}
2002
2003static void alx_pci_error_resume(struct pci_dev *pdev)
2004{
2005 struct alx_priv *alx = pci_get_drvdata(pdev);
2006 struct net_device *netdev = alx->dev;
2007
2008 dev_info(&pdev->dev, "pci error resume\n");
2009
2010 mutex_lock(&alx->mtx);
2011
2012 if (netif_running(netdev)) {
2013 alx_activate(alx);
2014 netif_device_attach(netdev);
2015 }
2016
2017 mutex_unlock(&alx->mtx);
2018}
2019
2020static const struct pci_error_handlers alx_err_handlers = {
2021 .error_detected = alx_pci_error_detected,
2022 .slot_reset = alx_pci_error_slot_reset,
2023 .resume = alx_pci_error_resume,
2024};
2025
2026static const struct pci_device_id alx_pci_tbl[] = {
2027 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8161),
2028 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2029 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2200),
2030 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2031 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2400),
2032 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2033 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2500),
2034 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2035 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8162),
2036 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2037 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8171) },
2038 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8172) },
2039 {}
2040};
2041
2042static struct pci_driver alx_driver = {
2043 .name = alx_drv_name,
2044 .id_table = alx_pci_tbl,
2045 .probe = alx_probe,
2046 .remove = alx_remove,
2047 .err_handler = &alx_err_handlers,
2048 .driver.pm = pm_sleep_ptr(&alx_pm_ops),
2049};
2050
2051module_pci_driver(alx_driver);
2052MODULE_DEVICE_TABLE(pci, alx_pci_tbl);
2053MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
2054MODULE_AUTHOR("Qualcomm Corporation");
2055MODULE_DESCRIPTION(
2056 "Qualcomm Atheros(R) AR816x/AR817x PCI-E Ethernet Network Driver");
2057MODULE_LICENSE("GPL");
1/*
2 * Copyright (c) 2013, 2021 Johannes Berg <johannes@sipsolutions.net>
3 *
4 * This file is free software: you may copy, redistribute and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation, either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * This file is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 *
17 * This file incorporates work covered by the following copyright and
18 * permission notice:
19 *
20 * Copyright (c) 2012 Qualcomm Atheros, Inc.
21 *
22 * Permission to use, copy, modify, and/or distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
27 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
29 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
30 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
31 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
32 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33 */
34
35#include <linux/module.h>
36#include <linux/pci.h>
37#include <linux/interrupt.h>
38#include <linux/ip.h>
39#include <linux/ipv6.h>
40#include <linux/if_vlan.h>
41#include <linux/mdio.h>
42#include <linux/aer.h>
43#include <linux/bitops.h>
44#include <linux/netdevice.h>
45#include <linux/etherdevice.h>
46#include <net/ip6_checksum.h>
47#include <linux/crc32.h>
48#include "alx.h"
49#include "hw.h"
50#include "reg.h"
51
52static const char alx_drv_name[] = "alx";
53
54static void alx_free_txbuf(struct alx_tx_queue *txq, int entry)
55{
56 struct alx_buffer *txb = &txq->bufs[entry];
57
58 if (dma_unmap_len(txb, size)) {
59 dma_unmap_single(txq->dev,
60 dma_unmap_addr(txb, dma),
61 dma_unmap_len(txb, size),
62 DMA_TO_DEVICE);
63 dma_unmap_len_set(txb, size, 0);
64 }
65
66 if (txb->skb) {
67 dev_kfree_skb_any(txb->skb);
68 txb->skb = NULL;
69 }
70}
71
72static int alx_refill_rx_ring(struct alx_priv *alx, gfp_t gfp)
73{
74 struct alx_rx_queue *rxq = alx->qnapi[0]->rxq;
75 struct sk_buff *skb;
76 struct alx_buffer *cur_buf;
77 dma_addr_t dma;
78 u16 cur, next, count = 0;
79
80 next = cur = rxq->write_idx;
81 if (++next == alx->rx_ringsz)
82 next = 0;
83 cur_buf = &rxq->bufs[cur];
84
85 while (!cur_buf->skb && next != rxq->read_idx) {
86 struct alx_rfd *rfd = &rxq->rfd[cur];
87
88 /*
89 * When DMA RX address is set to something like
90 * 0x....fc0, it will be very likely to cause DMA
91 * RFD overflow issue.
92 *
93 * To work around it, we apply rx skb with 64 bytes
94 * longer space, and offset the address whenever
95 * 0x....fc0 is detected.
96 */
97 skb = __netdev_alloc_skb(alx->dev, alx->rxbuf_size + 64, gfp);
98 if (!skb)
99 break;
100
101 if (((unsigned long)skb->data & 0xfff) == 0xfc0)
102 skb_reserve(skb, 64);
103
104 dma = dma_map_single(&alx->hw.pdev->dev,
105 skb->data, alx->rxbuf_size,
106 DMA_FROM_DEVICE);
107 if (dma_mapping_error(&alx->hw.pdev->dev, dma)) {
108 dev_kfree_skb(skb);
109 break;
110 }
111
112 /* Unfortunately, RX descriptor buffers must be 4-byte
113 * aligned, so we can't use IP alignment.
114 */
115 if (WARN_ON(dma & 3)) {
116 dev_kfree_skb(skb);
117 break;
118 }
119
120 cur_buf->skb = skb;
121 dma_unmap_len_set(cur_buf, size, alx->rxbuf_size);
122 dma_unmap_addr_set(cur_buf, dma, dma);
123 rfd->addr = cpu_to_le64(dma);
124
125 cur = next;
126 if (++next == alx->rx_ringsz)
127 next = 0;
128 cur_buf = &rxq->bufs[cur];
129 count++;
130 }
131
132 if (count) {
133 /* flush all updates before updating hardware */
134 wmb();
135 rxq->write_idx = cur;
136 alx_write_mem16(&alx->hw, ALX_RFD_PIDX, cur);
137 }
138
139 return count;
140}
141
142static struct alx_tx_queue *alx_tx_queue_mapping(struct alx_priv *alx,
143 struct sk_buff *skb)
144{
145 unsigned int r_idx = skb->queue_mapping;
146
147 if (r_idx >= alx->num_txq)
148 r_idx = r_idx % alx->num_txq;
149
150 return alx->qnapi[r_idx]->txq;
151}
152
153static struct netdev_queue *alx_get_tx_queue(const struct alx_tx_queue *txq)
154{
155 return netdev_get_tx_queue(txq->netdev, txq->queue_idx);
156}
157
158static inline int alx_tpd_avail(struct alx_tx_queue *txq)
159{
160 if (txq->write_idx >= txq->read_idx)
161 return txq->count + txq->read_idx - txq->write_idx - 1;
162 return txq->read_idx - txq->write_idx - 1;
163}
164
165static bool alx_clean_tx_irq(struct alx_tx_queue *txq)
166{
167 struct alx_priv *alx;
168 struct netdev_queue *tx_queue;
169 u16 hw_read_idx, sw_read_idx;
170 unsigned int total_bytes = 0, total_packets = 0;
171 int budget = ALX_DEFAULT_TX_WORK;
172
173 alx = netdev_priv(txq->netdev);
174 tx_queue = alx_get_tx_queue(txq);
175
176 sw_read_idx = txq->read_idx;
177 hw_read_idx = alx_read_mem16(&alx->hw, txq->c_reg);
178
179 if (sw_read_idx != hw_read_idx) {
180 while (sw_read_idx != hw_read_idx && budget > 0) {
181 struct sk_buff *skb;
182
183 skb = txq->bufs[sw_read_idx].skb;
184 if (skb) {
185 total_bytes += skb->len;
186 total_packets++;
187 budget--;
188 }
189
190 alx_free_txbuf(txq, sw_read_idx);
191
192 if (++sw_read_idx == txq->count)
193 sw_read_idx = 0;
194 }
195 txq->read_idx = sw_read_idx;
196
197 netdev_tx_completed_queue(tx_queue, total_packets, total_bytes);
198 }
199
200 if (netif_tx_queue_stopped(tx_queue) && netif_carrier_ok(alx->dev) &&
201 alx_tpd_avail(txq) > txq->count / 4)
202 netif_tx_wake_queue(tx_queue);
203
204 return sw_read_idx == hw_read_idx;
205}
206
207static void alx_schedule_link_check(struct alx_priv *alx)
208{
209 schedule_work(&alx->link_check_wk);
210}
211
212static void alx_schedule_reset(struct alx_priv *alx)
213{
214 schedule_work(&alx->reset_wk);
215}
216
217static int alx_clean_rx_irq(struct alx_rx_queue *rxq, int budget)
218{
219 struct alx_priv *alx;
220 struct alx_rrd *rrd;
221 struct alx_buffer *rxb;
222 struct sk_buff *skb;
223 u16 length, rfd_cleaned = 0;
224 int work = 0;
225
226 alx = netdev_priv(rxq->netdev);
227
228 while (work < budget) {
229 rrd = &rxq->rrd[rxq->rrd_read_idx];
230 if (!(rrd->word3 & cpu_to_le32(1 << RRD_UPDATED_SHIFT)))
231 break;
232 rrd->word3 &= ~cpu_to_le32(1 << RRD_UPDATED_SHIFT);
233
234 if (ALX_GET_FIELD(le32_to_cpu(rrd->word0),
235 RRD_SI) != rxq->read_idx ||
236 ALX_GET_FIELD(le32_to_cpu(rrd->word0),
237 RRD_NOR) != 1) {
238 alx_schedule_reset(alx);
239 return work;
240 }
241
242 rxb = &rxq->bufs[rxq->read_idx];
243 dma_unmap_single(rxq->dev,
244 dma_unmap_addr(rxb, dma),
245 dma_unmap_len(rxb, size),
246 DMA_FROM_DEVICE);
247 dma_unmap_len_set(rxb, size, 0);
248 skb = rxb->skb;
249 rxb->skb = NULL;
250
251 if (rrd->word3 & cpu_to_le32(1 << RRD_ERR_RES_SHIFT) ||
252 rrd->word3 & cpu_to_le32(1 << RRD_ERR_LEN_SHIFT)) {
253 rrd->word3 = 0;
254 dev_kfree_skb_any(skb);
255 goto next_pkt;
256 }
257
258 length = ALX_GET_FIELD(le32_to_cpu(rrd->word3),
259 RRD_PKTLEN) - ETH_FCS_LEN;
260 skb_put(skb, length);
261 skb->protocol = eth_type_trans(skb, rxq->netdev);
262
263 skb_checksum_none_assert(skb);
264 if (alx->dev->features & NETIF_F_RXCSUM &&
265 !(rrd->word3 & (cpu_to_le32(1 << RRD_ERR_L4_SHIFT) |
266 cpu_to_le32(1 << RRD_ERR_IPV4_SHIFT)))) {
267 switch (ALX_GET_FIELD(le32_to_cpu(rrd->word2),
268 RRD_PID)) {
269 case RRD_PID_IPV6UDP:
270 case RRD_PID_IPV4UDP:
271 case RRD_PID_IPV4TCP:
272 case RRD_PID_IPV6TCP:
273 skb->ip_summed = CHECKSUM_UNNECESSARY;
274 break;
275 }
276 }
277
278 napi_gro_receive(&rxq->np->napi, skb);
279 work++;
280
281next_pkt:
282 if (++rxq->read_idx == rxq->count)
283 rxq->read_idx = 0;
284 if (++rxq->rrd_read_idx == rxq->count)
285 rxq->rrd_read_idx = 0;
286
287 if (++rfd_cleaned > ALX_RX_ALLOC_THRESH)
288 rfd_cleaned -= alx_refill_rx_ring(alx, GFP_ATOMIC);
289 }
290
291 if (rfd_cleaned)
292 alx_refill_rx_ring(alx, GFP_ATOMIC);
293
294 return work;
295}
296
297static int alx_poll(struct napi_struct *napi, int budget)
298{
299 struct alx_napi *np = container_of(napi, struct alx_napi, napi);
300 struct alx_priv *alx = np->alx;
301 struct alx_hw *hw = &alx->hw;
302 unsigned long flags;
303 bool tx_complete = true;
304 int work = 0;
305
306 if (np->txq)
307 tx_complete = alx_clean_tx_irq(np->txq);
308 if (np->rxq)
309 work = alx_clean_rx_irq(np->rxq, budget);
310
311 if (!tx_complete || work == budget)
312 return budget;
313
314 napi_complete_done(&np->napi, work);
315
316 /* enable interrupt */
317 if (alx->hw.pdev->msix_enabled) {
318 alx_mask_msix(hw, np->vec_idx, false);
319 } else {
320 spin_lock_irqsave(&alx->irq_lock, flags);
321 alx->int_mask |= ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0;
322 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
323 spin_unlock_irqrestore(&alx->irq_lock, flags);
324 }
325
326 alx_post_write(hw);
327
328 return work;
329}
330
331static bool alx_intr_handle_misc(struct alx_priv *alx, u32 intr)
332{
333 struct alx_hw *hw = &alx->hw;
334
335 if (intr & ALX_ISR_FATAL) {
336 netif_warn(alx, hw, alx->dev,
337 "fatal interrupt 0x%x, resetting\n", intr);
338 alx_schedule_reset(alx);
339 return true;
340 }
341
342 if (intr & ALX_ISR_ALERT)
343 netdev_warn(alx->dev, "alert interrupt: 0x%x\n", intr);
344
345 if (intr & ALX_ISR_PHY) {
346 /* suppress PHY interrupt, because the source
347 * is from PHY internal. only the internal status
348 * is cleared, the interrupt status could be cleared.
349 */
350 alx->int_mask &= ~ALX_ISR_PHY;
351 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
352 alx_schedule_link_check(alx);
353 }
354
355 return false;
356}
357
358static irqreturn_t alx_intr_handle(struct alx_priv *alx, u32 intr)
359{
360 struct alx_hw *hw = &alx->hw;
361
362 spin_lock(&alx->irq_lock);
363
364 /* ACK interrupt */
365 alx_write_mem32(hw, ALX_ISR, intr | ALX_ISR_DIS);
366 intr &= alx->int_mask;
367
368 if (alx_intr_handle_misc(alx, intr))
369 goto out;
370
371 if (intr & (ALX_ISR_TX_Q0 | ALX_ISR_RX_Q0)) {
372 napi_schedule(&alx->qnapi[0]->napi);
373 /* mask rx/tx interrupt, enable them when napi complete */
374 alx->int_mask &= ~ALX_ISR_ALL_QUEUES;
375 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
376 }
377
378 alx_write_mem32(hw, ALX_ISR, 0);
379
380 out:
381 spin_unlock(&alx->irq_lock);
382 return IRQ_HANDLED;
383}
384
385static irqreturn_t alx_intr_msix_ring(int irq, void *data)
386{
387 struct alx_napi *np = data;
388 struct alx_hw *hw = &np->alx->hw;
389
390 /* mask interrupt to ACK chip */
391 alx_mask_msix(hw, np->vec_idx, true);
392 /* clear interrupt status */
393 alx_write_mem32(hw, ALX_ISR, np->vec_mask);
394
395 napi_schedule(&np->napi);
396
397 return IRQ_HANDLED;
398}
399
400static irqreturn_t alx_intr_msix_misc(int irq, void *data)
401{
402 struct alx_priv *alx = data;
403 struct alx_hw *hw = &alx->hw;
404 u32 intr;
405
406 /* mask interrupt to ACK chip */
407 alx_mask_msix(hw, 0, true);
408
409 /* read interrupt status */
410 intr = alx_read_mem32(hw, ALX_ISR);
411 intr &= (alx->int_mask & ~ALX_ISR_ALL_QUEUES);
412
413 if (alx_intr_handle_misc(alx, intr))
414 return IRQ_HANDLED;
415
416 /* clear interrupt status */
417 alx_write_mem32(hw, ALX_ISR, intr);
418
419 /* enable interrupt again */
420 alx_mask_msix(hw, 0, false);
421
422 return IRQ_HANDLED;
423}
424
425static irqreturn_t alx_intr_msi(int irq, void *data)
426{
427 struct alx_priv *alx = data;
428
429 return alx_intr_handle(alx, alx_read_mem32(&alx->hw, ALX_ISR));
430}
431
432static irqreturn_t alx_intr_legacy(int irq, void *data)
433{
434 struct alx_priv *alx = data;
435 struct alx_hw *hw = &alx->hw;
436 u32 intr;
437
438 intr = alx_read_mem32(hw, ALX_ISR);
439
440 if (intr & ALX_ISR_DIS || !(intr & alx->int_mask))
441 return IRQ_NONE;
442
443 return alx_intr_handle(alx, intr);
444}
445
446static const u16 txring_header_reg[] = {ALX_TPD_PRI0_ADDR_LO,
447 ALX_TPD_PRI1_ADDR_LO,
448 ALX_TPD_PRI2_ADDR_LO,
449 ALX_TPD_PRI3_ADDR_LO};
450
451static void alx_init_ring_ptrs(struct alx_priv *alx)
452{
453 struct alx_hw *hw = &alx->hw;
454 u32 addr_hi = ((u64)alx->descmem.dma) >> 32;
455 struct alx_napi *np;
456 int i;
457
458 for (i = 0; i < alx->num_napi; i++) {
459 np = alx->qnapi[i];
460 if (np->txq) {
461 np->txq->read_idx = 0;
462 np->txq->write_idx = 0;
463 alx_write_mem32(hw,
464 txring_header_reg[np->txq->queue_idx],
465 np->txq->tpd_dma);
466 }
467
468 if (np->rxq) {
469 np->rxq->read_idx = 0;
470 np->rxq->write_idx = 0;
471 np->rxq->rrd_read_idx = 0;
472 alx_write_mem32(hw, ALX_RRD_ADDR_LO, np->rxq->rrd_dma);
473 alx_write_mem32(hw, ALX_RFD_ADDR_LO, np->rxq->rfd_dma);
474 }
475 }
476
477 alx_write_mem32(hw, ALX_TX_BASE_ADDR_HI, addr_hi);
478 alx_write_mem32(hw, ALX_TPD_RING_SZ, alx->tx_ringsz);
479
480 alx_write_mem32(hw, ALX_RX_BASE_ADDR_HI, addr_hi);
481 alx_write_mem32(hw, ALX_RRD_RING_SZ, alx->rx_ringsz);
482 alx_write_mem32(hw, ALX_RFD_RING_SZ, alx->rx_ringsz);
483 alx_write_mem32(hw, ALX_RFD_BUF_SZ, alx->rxbuf_size);
484
485 /* load these pointers into the chip */
486 alx_write_mem32(hw, ALX_SRAM9, ALX_SRAM_LOAD_PTR);
487}
488
489static void alx_free_txring_buf(struct alx_tx_queue *txq)
490{
491 int i;
492
493 if (!txq->bufs)
494 return;
495
496 for (i = 0; i < txq->count; i++)
497 alx_free_txbuf(txq, i);
498
499 memset(txq->bufs, 0, txq->count * sizeof(struct alx_buffer));
500 memset(txq->tpd, 0, txq->count * sizeof(struct alx_txd));
501 txq->write_idx = 0;
502 txq->read_idx = 0;
503
504 netdev_tx_reset_queue(alx_get_tx_queue(txq));
505}
506
507static void alx_free_rxring_buf(struct alx_rx_queue *rxq)
508{
509 struct alx_buffer *cur_buf;
510 u16 i;
511
512 if (!rxq->bufs)
513 return;
514
515 for (i = 0; i < rxq->count; i++) {
516 cur_buf = rxq->bufs + i;
517 if (cur_buf->skb) {
518 dma_unmap_single(rxq->dev,
519 dma_unmap_addr(cur_buf, dma),
520 dma_unmap_len(cur_buf, size),
521 DMA_FROM_DEVICE);
522 dev_kfree_skb(cur_buf->skb);
523 cur_buf->skb = NULL;
524 dma_unmap_len_set(cur_buf, size, 0);
525 dma_unmap_addr_set(cur_buf, dma, 0);
526 }
527 }
528
529 rxq->write_idx = 0;
530 rxq->read_idx = 0;
531 rxq->rrd_read_idx = 0;
532}
533
534static void alx_free_buffers(struct alx_priv *alx)
535{
536 int i;
537
538 for (i = 0; i < alx->num_txq; i++)
539 if (alx->qnapi[i] && alx->qnapi[i]->txq)
540 alx_free_txring_buf(alx->qnapi[i]->txq);
541
542 if (alx->qnapi[0] && alx->qnapi[0]->rxq)
543 alx_free_rxring_buf(alx->qnapi[0]->rxq);
544}
545
546static int alx_reinit_rings(struct alx_priv *alx)
547{
548 alx_free_buffers(alx);
549
550 alx_init_ring_ptrs(alx);
551
552 if (!alx_refill_rx_ring(alx, GFP_KERNEL))
553 return -ENOMEM;
554
555 return 0;
556}
557
558static void alx_add_mc_addr(struct alx_hw *hw, const u8 *addr, u32 *mc_hash)
559{
560 u32 crc32, bit, reg;
561
562 crc32 = ether_crc(ETH_ALEN, addr);
563 reg = (crc32 >> 31) & 0x1;
564 bit = (crc32 >> 26) & 0x1F;
565
566 mc_hash[reg] |= BIT(bit);
567}
568
569static void __alx_set_rx_mode(struct net_device *netdev)
570{
571 struct alx_priv *alx = netdev_priv(netdev);
572 struct alx_hw *hw = &alx->hw;
573 struct netdev_hw_addr *ha;
574 u32 mc_hash[2] = {};
575
576 if (!(netdev->flags & IFF_ALLMULTI)) {
577 netdev_for_each_mc_addr(ha, netdev)
578 alx_add_mc_addr(hw, ha->addr, mc_hash);
579
580 alx_write_mem32(hw, ALX_HASH_TBL0, mc_hash[0]);
581 alx_write_mem32(hw, ALX_HASH_TBL1, mc_hash[1]);
582 }
583
584 hw->rx_ctrl &= ~(ALX_MAC_CTRL_MULTIALL_EN | ALX_MAC_CTRL_PROMISC_EN);
585 if (netdev->flags & IFF_PROMISC)
586 hw->rx_ctrl |= ALX_MAC_CTRL_PROMISC_EN;
587 if (netdev->flags & IFF_ALLMULTI)
588 hw->rx_ctrl |= ALX_MAC_CTRL_MULTIALL_EN;
589
590 alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl);
591}
592
593static void alx_set_rx_mode(struct net_device *netdev)
594{
595 __alx_set_rx_mode(netdev);
596}
597
598static int alx_set_mac_address(struct net_device *netdev, void *data)
599{
600 struct alx_priv *alx = netdev_priv(netdev);
601 struct alx_hw *hw = &alx->hw;
602 struct sockaddr *addr = data;
603
604 if (!is_valid_ether_addr(addr->sa_data))
605 return -EADDRNOTAVAIL;
606
607 if (netdev->addr_assign_type & NET_ADDR_RANDOM)
608 netdev->addr_assign_type ^= NET_ADDR_RANDOM;
609
610 eth_hw_addr_set(netdev, addr->sa_data);
611 memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
612 alx_set_macaddr(hw, hw->mac_addr);
613
614 return 0;
615}
616
617static int alx_alloc_tx_ring(struct alx_priv *alx, struct alx_tx_queue *txq,
618 int offset)
619{
620 txq->bufs = kcalloc(txq->count, sizeof(struct alx_buffer), GFP_KERNEL);
621 if (!txq->bufs)
622 return -ENOMEM;
623
624 txq->tpd = alx->descmem.virt + offset;
625 txq->tpd_dma = alx->descmem.dma + offset;
626 offset += sizeof(struct alx_txd) * txq->count;
627
628 return offset;
629}
630
631static int alx_alloc_rx_ring(struct alx_priv *alx, struct alx_rx_queue *rxq,
632 int offset)
633{
634 rxq->bufs = kcalloc(rxq->count, sizeof(struct alx_buffer), GFP_KERNEL);
635 if (!rxq->bufs)
636 return -ENOMEM;
637
638 rxq->rrd = alx->descmem.virt + offset;
639 rxq->rrd_dma = alx->descmem.dma + offset;
640 offset += sizeof(struct alx_rrd) * rxq->count;
641
642 rxq->rfd = alx->descmem.virt + offset;
643 rxq->rfd_dma = alx->descmem.dma + offset;
644 offset += sizeof(struct alx_rfd) * rxq->count;
645
646 return offset;
647}
648
649static int alx_alloc_rings(struct alx_priv *alx)
650{
651 int i, offset = 0;
652
653 /* physical tx/rx ring descriptors
654 *
655 * Allocate them as a single chunk because they must not cross a
656 * 4G boundary (hardware has a single register for high 32 bits
657 * of addresses only)
658 */
659 alx->descmem.size = sizeof(struct alx_txd) * alx->tx_ringsz *
660 alx->num_txq +
661 sizeof(struct alx_rrd) * alx->rx_ringsz +
662 sizeof(struct alx_rfd) * alx->rx_ringsz;
663 alx->descmem.virt = dma_alloc_coherent(&alx->hw.pdev->dev,
664 alx->descmem.size,
665 &alx->descmem.dma, GFP_KERNEL);
666 if (!alx->descmem.virt)
667 return -ENOMEM;
668
669 /* alignment requirements */
670 BUILD_BUG_ON(sizeof(struct alx_txd) % 8);
671 BUILD_BUG_ON(sizeof(struct alx_rrd) % 8);
672
673 for (i = 0; i < alx->num_txq; i++) {
674 offset = alx_alloc_tx_ring(alx, alx->qnapi[i]->txq, offset);
675 if (offset < 0) {
676 netdev_err(alx->dev, "Allocation of tx buffer failed!\n");
677 return -ENOMEM;
678 }
679 }
680
681 offset = alx_alloc_rx_ring(alx, alx->qnapi[0]->rxq, offset);
682 if (offset < 0) {
683 netdev_err(alx->dev, "Allocation of rx buffer failed!\n");
684 return -ENOMEM;
685 }
686
687 return 0;
688}
689
690static void alx_free_rings(struct alx_priv *alx)
691{
692 int i;
693
694 alx_free_buffers(alx);
695
696 for (i = 0; i < alx->num_txq; i++)
697 if (alx->qnapi[i] && alx->qnapi[i]->txq)
698 kfree(alx->qnapi[i]->txq->bufs);
699
700 if (alx->qnapi[0] && alx->qnapi[0]->rxq)
701 kfree(alx->qnapi[0]->rxq->bufs);
702
703 if (alx->descmem.virt)
704 dma_free_coherent(&alx->hw.pdev->dev,
705 alx->descmem.size,
706 alx->descmem.virt,
707 alx->descmem.dma);
708}
709
710static void alx_free_napis(struct alx_priv *alx)
711{
712 struct alx_napi *np;
713 int i;
714
715 for (i = 0; i < alx->num_napi; i++) {
716 np = alx->qnapi[i];
717 if (!np)
718 continue;
719
720 netif_napi_del(&np->napi);
721 kfree(np->txq);
722 kfree(np->rxq);
723 kfree(np);
724 alx->qnapi[i] = NULL;
725 }
726}
727
728static const u16 tx_pidx_reg[] = {ALX_TPD_PRI0_PIDX, ALX_TPD_PRI1_PIDX,
729 ALX_TPD_PRI2_PIDX, ALX_TPD_PRI3_PIDX};
730static const u16 tx_cidx_reg[] = {ALX_TPD_PRI0_CIDX, ALX_TPD_PRI1_CIDX,
731 ALX_TPD_PRI2_CIDX, ALX_TPD_PRI3_CIDX};
732static const u32 tx_vect_mask[] = {ALX_ISR_TX_Q0, ALX_ISR_TX_Q1,
733 ALX_ISR_TX_Q2, ALX_ISR_TX_Q3};
734static const u32 rx_vect_mask[] = {ALX_ISR_RX_Q0, ALX_ISR_RX_Q1,
735 ALX_ISR_RX_Q2, ALX_ISR_RX_Q3,
736 ALX_ISR_RX_Q4, ALX_ISR_RX_Q5,
737 ALX_ISR_RX_Q6, ALX_ISR_RX_Q7};
738
739static int alx_alloc_napis(struct alx_priv *alx)
740{
741 struct alx_napi *np;
742 struct alx_rx_queue *rxq;
743 struct alx_tx_queue *txq;
744 int i;
745
746 alx->int_mask &= ~ALX_ISR_ALL_QUEUES;
747
748 /* allocate alx_napi structures */
749 for (i = 0; i < alx->num_napi; i++) {
750 np = kzalloc(sizeof(struct alx_napi), GFP_KERNEL);
751 if (!np)
752 goto err_out;
753
754 np->alx = alx;
755 netif_napi_add(alx->dev, &np->napi, alx_poll);
756 alx->qnapi[i] = np;
757 }
758
759 /* allocate tx queues */
760 for (i = 0; i < alx->num_txq; i++) {
761 np = alx->qnapi[i];
762 txq = kzalloc(sizeof(*txq), GFP_KERNEL);
763 if (!txq)
764 goto err_out;
765
766 np->txq = txq;
767 txq->p_reg = tx_pidx_reg[i];
768 txq->c_reg = tx_cidx_reg[i];
769 txq->queue_idx = i;
770 txq->count = alx->tx_ringsz;
771 txq->netdev = alx->dev;
772 txq->dev = &alx->hw.pdev->dev;
773 np->vec_mask |= tx_vect_mask[i];
774 alx->int_mask |= tx_vect_mask[i];
775 }
776
777 /* allocate rx queues */
778 np = alx->qnapi[0];
779 rxq = kzalloc(sizeof(*rxq), GFP_KERNEL);
780 if (!rxq)
781 goto err_out;
782
783 np->rxq = rxq;
784 rxq->np = alx->qnapi[0];
785 rxq->queue_idx = 0;
786 rxq->count = alx->rx_ringsz;
787 rxq->netdev = alx->dev;
788 rxq->dev = &alx->hw.pdev->dev;
789 np->vec_mask |= rx_vect_mask[0];
790 alx->int_mask |= rx_vect_mask[0];
791
792 return 0;
793
794err_out:
795 netdev_err(alx->dev, "error allocating internal structures\n");
796 alx_free_napis(alx);
797 return -ENOMEM;
798}
799
800static const int txq_vec_mapping_shift[] = {
801 0, ALX_MSI_MAP_TBL1_TXQ0_SHIFT,
802 0, ALX_MSI_MAP_TBL1_TXQ1_SHIFT,
803 1, ALX_MSI_MAP_TBL2_TXQ2_SHIFT,
804 1, ALX_MSI_MAP_TBL2_TXQ3_SHIFT,
805};
806
807static void alx_config_vector_mapping(struct alx_priv *alx)
808{
809 struct alx_hw *hw = &alx->hw;
810 u32 tbl[2] = {0, 0};
811 int i, vector, idx, shift;
812
813 if (alx->hw.pdev->msix_enabled) {
814 /* tx mappings */
815 for (i = 0, vector = 1; i < alx->num_txq; i++, vector++) {
816 idx = txq_vec_mapping_shift[i * 2];
817 shift = txq_vec_mapping_shift[i * 2 + 1];
818 tbl[idx] |= vector << shift;
819 }
820
821 /* rx mapping */
822 tbl[0] |= 1 << ALX_MSI_MAP_TBL1_RXQ0_SHIFT;
823 }
824
825 alx_write_mem32(hw, ALX_MSI_MAP_TBL1, tbl[0]);
826 alx_write_mem32(hw, ALX_MSI_MAP_TBL2, tbl[1]);
827 alx_write_mem32(hw, ALX_MSI_ID_MAP, 0);
828}
829
830static int alx_enable_msix(struct alx_priv *alx)
831{
832 int err, num_vec, num_txq, num_rxq;
833
834 num_txq = min_t(int, num_online_cpus(), ALX_MAX_TX_QUEUES);
835 num_rxq = 1;
836 num_vec = max_t(int, num_txq, num_rxq) + 1;
837
838 err = pci_alloc_irq_vectors(alx->hw.pdev, num_vec, num_vec,
839 PCI_IRQ_MSIX);
840 if (err < 0) {
841 netdev_warn(alx->dev, "Enabling MSI-X interrupts failed!\n");
842 return err;
843 }
844
845 alx->num_vec = num_vec;
846 alx->num_napi = num_vec - 1;
847 alx->num_txq = num_txq;
848 alx->num_rxq = num_rxq;
849
850 return err;
851}
852
853static int alx_request_msix(struct alx_priv *alx)
854{
855 struct net_device *netdev = alx->dev;
856 int i, err, vector = 0, free_vector = 0;
857
858 err = request_irq(pci_irq_vector(alx->hw.pdev, 0), alx_intr_msix_misc,
859 0, netdev->name, alx);
860 if (err)
861 goto out_err;
862
863 for (i = 0; i < alx->num_napi; i++) {
864 struct alx_napi *np = alx->qnapi[i];
865
866 vector++;
867
868 if (np->txq && np->rxq)
869 sprintf(np->irq_lbl, "%s-TxRx-%u", netdev->name,
870 np->txq->queue_idx);
871 else if (np->txq)
872 sprintf(np->irq_lbl, "%s-tx-%u", netdev->name,
873 np->txq->queue_idx);
874 else if (np->rxq)
875 sprintf(np->irq_lbl, "%s-rx-%u", netdev->name,
876 np->rxq->queue_idx);
877 else
878 sprintf(np->irq_lbl, "%s-unused", netdev->name);
879
880 np->vec_idx = vector;
881 err = request_irq(pci_irq_vector(alx->hw.pdev, vector),
882 alx_intr_msix_ring, 0, np->irq_lbl, np);
883 if (err)
884 goto out_free;
885 }
886 return 0;
887
888out_free:
889 free_irq(pci_irq_vector(alx->hw.pdev, free_vector++), alx);
890
891 vector--;
892 for (i = 0; i < vector; i++)
893 free_irq(pci_irq_vector(alx->hw.pdev,free_vector++),
894 alx->qnapi[i]);
895
896out_err:
897 return err;
898}
899
900static int alx_init_intr(struct alx_priv *alx)
901{
902 int ret;
903
904 ret = pci_alloc_irq_vectors(alx->hw.pdev, 1, 1,
905 PCI_IRQ_MSI | PCI_IRQ_LEGACY);
906 if (ret < 0)
907 return ret;
908
909 alx->num_vec = 1;
910 alx->num_napi = 1;
911 alx->num_txq = 1;
912 alx->num_rxq = 1;
913 return 0;
914}
915
916static void alx_irq_enable(struct alx_priv *alx)
917{
918 struct alx_hw *hw = &alx->hw;
919 int i;
920
921 /* level-1 interrupt switch */
922 alx_write_mem32(hw, ALX_ISR, 0);
923 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
924 alx_post_write(hw);
925
926 if (alx->hw.pdev->msix_enabled) {
927 /* enable all msix irqs */
928 for (i = 0; i < alx->num_vec; i++)
929 alx_mask_msix(hw, i, false);
930 }
931}
932
933static void alx_irq_disable(struct alx_priv *alx)
934{
935 struct alx_hw *hw = &alx->hw;
936 int i;
937
938 alx_write_mem32(hw, ALX_ISR, ALX_ISR_DIS);
939 alx_write_mem32(hw, ALX_IMR, 0);
940 alx_post_write(hw);
941
942 if (alx->hw.pdev->msix_enabled) {
943 for (i = 0; i < alx->num_vec; i++) {
944 alx_mask_msix(hw, i, true);
945 synchronize_irq(pci_irq_vector(alx->hw.pdev, i));
946 }
947 } else {
948 synchronize_irq(pci_irq_vector(alx->hw.pdev, 0));
949 }
950}
951
952static int alx_realloc_resources(struct alx_priv *alx)
953{
954 int err;
955
956 alx_free_rings(alx);
957 alx_free_napis(alx);
958 pci_free_irq_vectors(alx->hw.pdev);
959
960 err = alx_init_intr(alx);
961 if (err)
962 return err;
963
964 err = alx_alloc_napis(alx);
965 if (err)
966 return err;
967
968 err = alx_alloc_rings(alx);
969 if (err)
970 return err;
971
972 return 0;
973}
974
975static int alx_request_irq(struct alx_priv *alx)
976{
977 struct pci_dev *pdev = alx->hw.pdev;
978 struct alx_hw *hw = &alx->hw;
979 int err;
980 u32 msi_ctrl;
981
982 msi_ctrl = (hw->imt >> 1) << ALX_MSI_RETRANS_TM_SHIFT;
983
984 if (alx->hw.pdev->msix_enabled) {
985 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, msi_ctrl);
986 err = alx_request_msix(alx);
987 if (!err)
988 goto out;
989
990 /* msix request failed, realloc resources */
991 err = alx_realloc_resources(alx);
992 if (err)
993 goto out;
994 }
995
996 if (alx->hw.pdev->msi_enabled) {
997 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER,
998 msi_ctrl | ALX_MSI_MASK_SEL_LINE);
999 err = request_irq(pci_irq_vector(pdev, 0), alx_intr_msi, 0,
1000 alx->dev->name, alx);
1001 if (!err)
1002 goto out;
1003
1004 /* fall back to legacy interrupt */
1005 pci_free_irq_vectors(alx->hw.pdev);
1006 }
1007
1008 alx_write_mem32(hw, ALX_MSI_RETRANS_TIMER, 0);
1009 err = request_irq(pci_irq_vector(pdev, 0), alx_intr_legacy, IRQF_SHARED,
1010 alx->dev->name, alx);
1011out:
1012 if (!err)
1013 alx_config_vector_mapping(alx);
1014 else
1015 netdev_err(alx->dev, "IRQ registration failed!\n");
1016 return err;
1017}
1018
1019static void alx_free_irq(struct alx_priv *alx)
1020{
1021 struct pci_dev *pdev = alx->hw.pdev;
1022 int i;
1023
1024 free_irq(pci_irq_vector(pdev, 0), alx);
1025 if (alx->hw.pdev->msix_enabled) {
1026 for (i = 0; i < alx->num_napi; i++)
1027 free_irq(pci_irq_vector(pdev, i + 1), alx->qnapi[i]);
1028 }
1029
1030 pci_free_irq_vectors(pdev);
1031}
1032
1033static int alx_identify_hw(struct alx_priv *alx)
1034{
1035 struct alx_hw *hw = &alx->hw;
1036 int rev = alx_hw_revision(hw);
1037
1038 if (rev > ALX_REV_C0)
1039 return -EINVAL;
1040
1041 hw->max_dma_chnl = rev >= ALX_REV_B0 ? 4 : 2;
1042
1043 return 0;
1044}
1045
1046static int alx_init_sw(struct alx_priv *alx)
1047{
1048 struct pci_dev *pdev = alx->hw.pdev;
1049 struct alx_hw *hw = &alx->hw;
1050 int err;
1051
1052 err = alx_identify_hw(alx);
1053 if (err) {
1054 dev_err(&pdev->dev, "unrecognized chip, aborting\n");
1055 return err;
1056 }
1057
1058 alx->hw.lnk_patch =
1059 pdev->device == ALX_DEV_ID_AR8161 &&
1060 pdev->subsystem_vendor == PCI_VENDOR_ID_ATTANSIC &&
1061 pdev->subsystem_device == 0x0091 &&
1062 pdev->revision == 0;
1063
1064 hw->smb_timer = 400;
1065 hw->mtu = alx->dev->mtu;
1066 alx->rxbuf_size = ALX_MAX_FRAME_LEN(hw->mtu);
1067 /* MTU range: 34 - 9256 */
1068 alx->dev->min_mtu = 34;
1069 alx->dev->max_mtu = ALX_MAX_FRAME_LEN(ALX_MAX_FRAME_SIZE);
1070 alx->tx_ringsz = 256;
1071 alx->rx_ringsz = 512;
1072 hw->imt = 200;
1073 alx->int_mask = ALX_ISR_MISC;
1074 hw->dma_chnl = hw->max_dma_chnl;
1075 hw->ith_tpd = alx->tx_ringsz / 3;
1076 hw->link_speed = SPEED_UNKNOWN;
1077 hw->duplex = DUPLEX_UNKNOWN;
1078 hw->adv_cfg = ADVERTISED_Autoneg |
1079 ADVERTISED_10baseT_Half |
1080 ADVERTISED_10baseT_Full |
1081 ADVERTISED_100baseT_Full |
1082 ADVERTISED_100baseT_Half |
1083 ADVERTISED_1000baseT_Full;
1084 hw->flowctrl = ALX_FC_ANEG | ALX_FC_RX | ALX_FC_TX;
1085
1086 hw->rx_ctrl = ALX_MAC_CTRL_WOLSPED_SWEN |
1087 ALX_MAC_CTRL_MHASH_ALG_HI5B |
1088 ALX_MAC_CTRL_BRD_EN |
1089 ALX_MAC_CTRL_PCRCE |
1090 ALX_MAC_CTRL_CRCE |
1091 ALX_MAC_CTRL_RXFC_EN |
1092 ALX_MAC_CTRL_TXFC_EN |
1093 7 << ALX_MAC_CTRL_PRMBLEN_SHIFT;
1094 mutex_init(&alx->mtx);
1095
1096 return 0;
1097}
1098
1099
1100static netdev_features_t alx_fix_features(struct net_device *netdev,
1101 netdev_features_t features)
1102{
1103 if (netdev->mtu > ALX_MAX_TSO_PKT_SIZE)
1104 features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
1105
1106 return features;
1107}
1108
1109static void alx_netif_stop(struct alx_priv *alx)
1110{
1111 int i;
1112
1113 netif_trans_update(alx->dev);
1114 if (netif_carrier_ok(alx->dev)) {
1115 netif_carrier_off(alx->dev);
1116 netif_tx_disable(alx->dev);
1117 for (i = 0; i < alx->num_napi; i++)
1118 napi_disable(&alx->qnapi[i]->napi);
1119 }
1120}
1121
1122static void alx_halt(struct alx_priv *alx)
1123{
1124 struct alx_hw *hw = &alx->hw;
1125
1126 lockdep_assert_held(&alx->mtx);
1127
1128 alx_netif_stop(alx);
1129 hw->link_speed = SPEED_UNKNOWN;
1130 hw->duplex = DUPLEX_UNKNOWN;
1131
1132 alx_reset_mac(hw);
1133
1134 /* disable l0s/l1 */
1135 alx_enable_aspm(hw, false, false);
1136 alx_irq_disable(alx);
1137 alx_free_buffers(alx);
1138}
1139
1140static void alx_configure(struct alx_priv *alx)
1141{
1142 struct alx_hw *hw = &alx->hw;
1143
1144 alx_configure_basic(hw);
1145 alx_disable_rss(hw);
1146 __alx_set_rx_mode(alx->dev);
1147
1148 alx_write_mem32(hw, ALX_MAC_CTRL, hw->rx_ctrl);
1149}
1150
1151static void alx_activate(struct alx_priv *alx)
1152{
1153 lockdep_assert_held(&alx->mtx);
1154
1155 /* hardware setting lost, restore it */
1156 alx_reinit_rings(alx);
1157 alx_configure(alx);
1158
1159 /* clear old interrupts */
1160 alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS);
1161
1162 alx_irq_enable(alx);
1163
1164 alx_schedule_link_check(alx);
1165}
1166
1167static void alx_reinit(struct alx_priv *alx)
1168{
1169 lockdep_assert_held(&alx->mtx);
1170
1171 alx_halt(alx);
1172 alx_activate(alx);
1173}
1174
1175static int alx_change_mtu(struct net_device *netdev, int mtu)
1176{
1177 struct alx_priv *alx = netdev_priv(netdev);
1178 int max_frame = ALX_MAX_FRAME_LEN(mtu);
1179
1180 netdev->mtu = mtu;
1181 alx->hw.mtu = mtu;
1182 alx->rxbuf_size = max(max_frame, ALX_DEF_RXBUF_SIZE);
1183 netdev_update_features(netdev);
1184 if (netif_running(netdev)) {
1185 mutex_lock(&alx->mtx);
1186 alx_reinit(alx);
1187 mutex_unlock(&alx->mtx);
1188 }
1189 return 0;
1190}
1191
1192static void alx_netif_start(struct alx_priv *alx)
1193{
1194 int i;
1195
1196 netif_tx_wake_all_queues(alx->dev);
1197 for (i = 0; i < alx->num_napi; i++)
1198 napi_enable(&alx->qnapi[i]->napi);
1199 netif_carrier_on(alx->dev);
1200}
1201
1202static int __alx_open(struct alx_priv *alx, bool resume)
1203{
1204 int err;
1205
1206 err = alx_enable_msix(alx);
1207 if (err < 0) {
1208 err = alx_init_intr(alx);
1209 if (err)
1210 return err;
1211 }
1212
1213 if (!resume)
1214 netif_carrier_off(alx->dev);
1215
1216 err = alx_alloc_napis(alx);
1217 if (err)
1218 goto out_disable_adv_intr;
1219
1220 err = alx_alloc_rings(alx);
1221 if (err)
1222 goto out_free_rings;
1223
1224 alx_configure(alx);
1225
1226 err = alx_request_irq(alx);
1227 if (err)
1228 goto out_free_rings;
1229
1230 /* must be called after alx_request_irq because the chip stops working
1231 * if we copy the dma addresses in alx_init_ring_ptrs twice when
1232 * requesting msi-x interrupts failed
1233 */
1234 alx_reinit_rings(alx);
1235
1236 netif_set_real_num_tx_queues(alx->dev, alx->num_txq);
1237 netif_set_real_num_rx_queues(alx->dev, alx->num_rxq);
1238
1239 /* clear old interrupts */
1240 alx_write_mem32(&alx->hw, ALX_ISR, ~(u32)ALX_ISR_DIS);
1241
1242 alx_irq_enable(alx);
1243
1244 if (!resume)
1245 netif_tx_start_all_queues(alx->dev);
1246
1247 alx_schedule_link_check(alx);
1248 return 0;
1249
1250out_free_rings:
1251 alx_free_rings(alx);
1252 alx_free_napis(alx);
1253out_disable_adv_intr:
1254 pci_free_irq_vectors(alx->hw.pdev);
1255 return err;
1256}
1257
1258static void __alx_stop(struct alx_priv *alx)
1259{
1260 lockdep_assert_held(&alx->mtx);
1261
1262 alx_free_irq(alx);
1263
1264 cancel_work_sync(&alx->link_check_wk);
1265 cancel_work_sync(&alx->reset_wk);
1266
1267 alx_halt(alx);
1268 alx_free_rings(alx);
1269 alx_free_napis(alx);
1270}
1271
1272static const char *alx_speed_desc(struct alx_hw *hw)
1273{
1274 switch (alx_speed_to_ethadv(hw->link_speed, hw->duplex)) {
1275 case ADVERTISED_1000baseT_Full:
1276 return "1 Gbps Full";
1277 case ADVERTISED_100baseT_Full:
1278 return "100 Mbps Full";
1279 case ADVERTISED_100baseT_Half:
1280 return "100 Mbps Half";
1281 case ADVERTISED_10baseT_Full:
1282 return "10 Mbps Full";
1283 case ADVERTISED_10baseT_Half:
1284 return "10 Mbps Half";
1285 default:
1286 return "Unknown speed";
1287 }
1288}
1289
1290static void alx_check_link(struct alx_priv *alx)
1291{
1292 struct alx_hw *hw = &alx->hw;
1293 unsigned long flags;
1294 int old_speed;
1295 int err;
1296
1297 lockdep_assert_held(&alx->mtx);
1298
1299 /* clear PHY internal interrupt status, otherwise the main
1300 * interrupt status will be asserted forever
1301 */
1302 alx_clear_phy_intr(hw);
1303
1304 old_speed = hw->link_speed;
1305 err = alx_read_phy_link(hw);
1306 if (err < 0)
1307 goto reset;
1308
1309 spin_lock_irqsave(&alx->irq_lock, flags);
1310 alx->int_mask |= ALX_ISR_PHY;
1311 alx_write_mem32(hw, ALX_IMR, alx->int_mask);
1312 spin_unlock_irqrestore(&alx->irq_lock, flags);
1313
1314 if (old_speed == hw->link_speed)
1315 return;
1316
1317 if (hw->link_speed != SPEED_UNKNOWN) {
1318 netif_info(alx, link, alx->dev,
1319 "NIC Up: %s\n", alx_speed_desc(hw));
1320 alx_post_phy_link(hw);
1321 alx_enable_aspm(hw, true, true);
1322 alx_start_mac(hw);
1323
1324 if (old_speed == SPEED_UNKNOWN)
1325 alx_netif_start(alx);
1326 } else {
1327 /* link is now down */
1328 alx_netif_stop(alx);
1329 netif_info(alx, link, alx->dev, "Link Down\n");
1330 err = alx_reset_mac(hw);
1331 if (err)
1332 goto reset;
1333 alx_irq_disable(alx);
1334
1335 /* MAC reset causes all HW settings to be lost, restore all */
1336 err = alx_reinit_rings(alx);
1337 if (err)
1338 goto reset;
1339 alx_configure(alx);
1340 alx_enable_aspm(hw, false, true);
1341 alx_post_phy_link(hw);
1342 alx_irq_enable(alx);
1343 }
1344
1345 return;
1346
1347reset:
1348 alx_schedule_reset(alx);
1349}
1350
1351static int alx_open(struct net_device *netdev)
1352{
1353 struct alx_priv *alx = netdev_priv(netdev);
1354 int ret;
1355
1356 mutex_lock(&alx->mtx);
1357 ret = __alx_open(alx, false);
1358 mutex_unlock(&alx->mtx);
1359
1360 return ret;
1361}
1362
1363static int alx_stop(struct net_device *netdev)
1364{
1365 struct alx_priv *alx = netdev_priv(netdev);
1366
1367 mutex_lock(&alx->mtx);
1368 __alx_stop(alx);
1369 mutex_unlock(&alx->mtx);
1370
1371 return 0;
1372}
1373
1374static void alx_link_check(struct work_struct *work)
1375{
1376 struct alx_priv *alx;
1377
1378 alx = container_of(work, struct alx_priv, link_check_wk);
1379
1380 mutex_lock(&alx->mtx);
1381 alx_check_link(alx);
1382 mutex_unlock(&alx->mtx);
1383}
1384
1385static void alx_reset(struct work_struct *work)
1386{
1387 struct alx_priv *alx = container_of(work, struct alx_priv, reset_wk);
1388
1389 mutex_lock(&alx->mtx);
1390 alx_reinit(alx);
1391 mutex_unlock(&alx->mtx);
1392}
1393
1394static int alx_tpd_req(struct sk_buff *skb)
1395{
1396 int num;
1397
1398 num = skb_shinfo(skb)->nr_frags + 1;
1399 /* we need one extra descriptor for LSOv2 */
1400 if (skb_is_gso(skb) && skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
1401 num++;
1402
1403 return num;
1404}
1405
1406static int alx_tx_csum(struct sk_buff *skb, struct alx_txd *first)
1407{
1408 u8 cso, css;
1409
1410 if (skb->ip_summed != CHECKSUM_PARTIAL)
1411 return 0;
1412
1413 cso = skb_checksum_start_offset(skb);
1414 if (cso & 1)
1415 return -EINVAL;
1416
1417 css = cso + skb->csum_offset;
1418 first->word1 |= cpu_to_le32((cso >> 1) << TPD_CXSUMSTART_SHIFT);
1419 first->word1 |= cpu_to_le32((css >> 1) << TPD_CXSUMOFFSET_SHIFT);
1420 first->word1 |= cpu_to_le32(1 << TPD_CXSUM_EN_SHIFT);
1421
1422 return 0;
1423}
1424
1425static int alx_tso(struct sk_buff *skb, struct alx_txd *first)
1426{
1427 int err;
1428
1429 if (skb->ip_summed != CHECKSUM_PARTIAL)
1430 return 0;
1431
1432 if (!skb_is_gso(skb))
1433 return 0;
1434
1435 err = skb_cow_head(skb, 0);
1436 if (err < 0)
1437 return err;
1438
1439 if (skb->protocol == htons(ETH_P_IP)) {
1440 struct iphdr *iph = ip_hdr(skb);
1441
1442 iph->check = 0;
1443 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
1444 0, IPPROTO_TCP, 0);
1445 first->word1 |= 1 << TPD_IPV4_SHIFT;
1446 } else if (skb_is_gso_v6(skb)) {
1447 tcp_v6_gso_csum_prep(skb);
1448 /* LSOv2: the first TPD only provides the packet length */
1449 first->adrl.l.pkt_len = skb->len;
1450 first->word1 |= 1 << TPD_LSO_V2_SHIFT;
1451 }
1452
1453 first->word1 |= 1 << TPD_LSO_EN_SHIFT;
1454 first->word1 |= (skb_transport_offset(skb) &
1455 TPD_L4HDROFFSET_MASK) << TPD_L4HDROFFSET_SHIFT;
1456 first->word1 |= (skb_shinfo(skb)->gso_size &
1457 TPD_MSS_MASK) << TPD_MSS_SHIFT;
1458 return 1;
1459}
1460
1461static int alx_map_tx_skb(struct alx_tx_queue *txq, struct sk_buff *skb)
1462{
1463 struct alx_txd *tpd, *first_tpd;
1464 dma_addr_t dma;
1465 int maplen, f, first_idx = txq->write_idx;
1466
1467 first_tpd = &txq->tpd[txq->write_idx];
1468 tpd = first_tpd;
1469
1470 if (tpd->word1 & (1 << TPD_LSO_V2_SHIFT)) {
1471 if (++txq->write_idx == txq->count)
1472 txq->write_idx = 0;
1473
1474 tpd = &txq->tpd[txq->write_idx];
1475 tpd->len = first_tpd->len;
1476 tpd->vlan_tag = first_tpd->vlan_tag;
1477 tpd->word1 = first_tpd->word1;
1478 }
1479
1480 maplen = skb_headlen(skb);
1481 dma = dma_map_single(txq->dev, skb->data, maplen,
1482 DMA_TO_DEVICE);
1483 if (dma_mapping_error(txq->dev, dma))
1484 goto err_dma;
1485
1486 dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen);
1487 dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma);
1488
1489 tpd->adrl.addr = cpu_to_le64(dma);
1490 tpd->len = cpu_to_le16(maplen);
1491
1492 for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
1493 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1494
1495 if (++txq->write_idx == txq->count)
1496 txq->write_idx = 0;
1497 tpd = &txq->tpd[txq->write_idx];
1498
1499 tpd->word1 = first_tpd->word1;
1500
1501 maplen = skb_frag_size(frag);
1502 dma = skb_frag_dma_map(txq->dev, frag, 0,
1503 maplen, DMA_TO_DEVICE);
1504 if (dma_mapping_error(txq->dev, dma))
1505 goto err_dma;
1506 dma_unmap_len_set(&txq->bufs[txq->write_idx], size, maplen);
1507 dma_unmap_addr_set(&txq->bufs[txq->write_idx], dma, dma);
1508
1509 tpd->adrl.addr = cpu_to_le64(dma);
1510 tpd->len = cpu_to_le16(maplen);
1511 }
1512
1513 /* last TPD, set EOP flag and store skb */
1514 tpd->word1 |= cpu_to_le32(1 << TPD_EOP_SHIFT);
1515 txq->bufs[txq->write_idx].skb = skb;
1516
1517 if (++txq->write_idx == txq->count)
1518 txq->write_idx = 0;
1519
1520 return 0;
1521
1522err_dma:
1523 f = first_idx;
1524 while (f != txq->write_idx) {
1525 alx_free_txbuf(txq, f);
1526 if (++f == txq->count)
1527 f = 0;
1528 }
1529 return -ENOMEM;
1530}
1531
1532static netdev_tx_t alx_start_xmit_ring(struct sk_buff *skb,
1533 struct alx_tx_queue *txq)
1534{
1535 struct alx_priv *alx;
1536 struct alx_txd *first;
1537 int tso;
1538
1539 alx = netdev_priv(txq->netdev);
1540
1541 if (alx_tpd_avail(txq) < alx_tpd_req(skb)) {
1542 netif_tx_stop_queue(alx_get_tx_queue(txq));
1543 goto drop;
1544 }
1545
1546 first = &txq->tpd[txq->write_idx];
1547 memset(first, 0, sizeof(*first));
1548
1549 tso = alx_tso(skb, first);
1550 if (tso < 0)
1551 goto drop;
1552 else if (!tso && alx_tx_csum(skb, first))
1553 goto drop;
1554
1555 if (alx_map_tx_skb(txq, skb) < 0)
1556 goto drop;
1557
1558 netdev_tx_sent_queue(alx_get_tx_queue(txq), skb->len);
1559
1560 /* flush updates before updating hardware */
1561 wmb();
1562 alx_write_mem16(&alx->hw, txq->p_reg, txq->write_idx);
1563
1564 if (alx_tpd_avail(txq) < txq->count / 8)
1565 netif_tx_stop_queue(alx_get_tx_queue(txq));
1566
1567 return NETDEV_TX_OK;
1568
1569drop:
1570 dev_kfree_skb_any(skb);
1571 return NETDEV_TX_OK;
1572}
1573
1574static netdev_tx_t alx_start_xmit(struct sk_buff *skb,
1575 struct net_device *netdev)
1576{
1577 struct alx_priv *alx = netdev_priv(netdev);
1578 return alx_start_xmit_ring(skb, alx_tx_queue_mapping(alx, skb));
1579}
1580
1581static void alx_tx_timeout(struct net_device *dev, unsigned int txqueue)
1582{
1583 struct alx_priv *alx = netdev_priv(dev);
1584
1585 alx_schedule_reset(alx);
1586}
1587
1588static int alx_mdio_read(struct net_device *netdev,
1589 int prtad, int devad, u16 addr)
1590{
1591 struct alx_priv *alx = netdev_priv(netdev);
1592 struct alx_hw *hw = &alx->hw;
1593 u16 val;
1594 int err;
1595
1596 if (prtad != hw->mdio.prtad)
1597 return -EINVAL;
1598
1599 if (devad == MDIO_DEVAD_NONE)
1600 err = alx_read_phy_reg(hw, addr, &val);
1601 else
1602 err = alx_read_phy_ext(hw, devad, addr, &val);
1603
1604 if (err)
1605 return err;
1606 return val;
1607}
1608
1609static int alx_mdio_write(struct net_device *netdev,
1610 int prtad, int devad, u16 addr, u16 val)
1611{
1612 struct alx_priv *alx = netdev_priv(netdev);
1613 struct alx_hw *hw = &alx->hw;
1614
1615 if (prtad != hw->mdio.prtad)
1616 return -EINVAL;
1617
1618 if (devad == MDIO_DEVAD_NONE)
1619 return alx_write_phy_reg(hw, addr, val);
1620
1621 return alx_write_phy_ext(hw, devad, addr, val);
1622}
1623
1624static int alx_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1625{
1626 struct alx_priv *alx = netdev_priv(netdev);
1627
1628 if (!netif_running(netdev))
1629 return -EAGAIN;
1630
1631 return mdio_mii_ioctl(&alx->hw.mdio, if_mii(ifr), cmd);
1632}
1633
1634#ifdef CONFIG_NET_POLL_CONTROLLER
1635static void alx_poll_controller(struct net_device *netdev)
1636{
1637 struct alx_priv *alx = netdev_priv(netdev);
1638 int i;
1639
1640 if (alx->hw.pdev->msix_enabled) {
1641 alx_intr_msix_misc(0, alx);
1642 for (i = 0; i < alx->num_txq; i++)
1643 alx_intr_msix_ring(0, alx->qnapi[i]);
1644 } else if (alx->hw.pdev->msi_enabled)
1645 alx_intr_msi(0, alx);
1646 else
1647 alx_intr_legacy(0, alx);
1648}
1649#endif
1650
1651static void alx_get_stats64(struct net_device *dev,
1652 struct rtnl_link_stats64 *net_stats)
1653{
1654 struct alx_priv *alx = netdev_priv(dev);
1655 struct alx_hw_stats *hw_stats = &alx->hw.stats;
1656
1657 spin_lock(&alx->stats_lock);
1658
1659 alx_update_hw_stats(&alx->hw);
1660
1661 net_stats->tx_bytes = hw_stats->tx_byte_cnt;
1662 net_stats->rx_bytes = hw_stats->rx_byte_cnt;
1663 net_stats->multicast = hw_stats->rx_mcast;
1664 net_stats->collisions = hw_stats->tx_single_col +
1665 hw_stats->tx_multi_col +
1666 hw_stats->tx_late_col +
1667 hw_stats->tx_abort_col;
1668
1669 net_stats->rx_errors = hw_stats->rx_frag +
1670 hw_stats->rx_fcs_err +
1671 hw_stats->rx_len_err +
1672 hw_stats->rx_ov_sz +
1673 hw_stats->rx_ov_rrd +
1674 hw_stats->rx_align_err +
1675 hw_stats->rx_ov_rxf;
1676
1677 net_stats->rx_fifo_errors = hw_stats->rx_ov_rxf;
1678 net_stats->rx_length_errors = hw_stats->rx_len_err;
1679 net_stats->rx_crc_errors = hw_stats->rx_fcs_err;
1680 net_stats->rx_frame_errors = hw_stats->rx_align_err;
1681 net_stats->rx_dropped = hw_stats->rx_ov_rrd;
1682
1683 net_stats->tx_errors = hw_stats->tx_late_col +
1684 hw_stats->tx_abort_col +
1685 hw_stats->tx_underrun +
1686 hw_stats->tx_trunc;
1687
1688 net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
1689 net_stats->tx_fifo_errors = hw_stats->tx_underrun;
1690 net_stats->tx_window_errors = hw_stats->tx_late_col;
1691
1692 net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;
1693 net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
1694
1695 spin_unlock(&alx->stats_lock);
1696}
1697
1698static const struct net_device_ops alx_netdev_ops = {
1699 .ndo_open = alx_open,
1700 .ndo_stop = alx_stop,
1701 .ndo_start_xmit = alx_start_xmit,
1702 .ndo_get_stats64 = alx_get_stats64,
1703 .ndo_set_rx_mode = alx_set_rx_mode,
1704 .ndo_validate_addr = eth_validate_addr,
1705 .ndo_set_mac_address = alx_set_mac_address,
1706 .ndo_change_mtu = alx_change_mtu,
1707 .ndo_eth_ioctl = alx_ioctl,
1708 .ndo_tx_timeout = alx_tx_timeout,
1709 .ndo_fix_features = alx_fix_features,
1710#ifdef CONFIG_NET_POLL_CONTROLLER
1711 .ndo_poll_controller = alx_poll_controller,
1712#endif
1713};
1714
1715static int alx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1716{
1717 struct net_device *netdev;
1718 struct alx_priv *alx;
1719 struct alx_hw *hw;
1720 bool phy_configured;
1721 int err;
1722
1723 err = pci_enable_device_mem(pdev);
1724 if (err)
1725 return err;
1726
1727 /* The alx chip can DMA to 64-bit addresses, but it uses a single
1728 * shared register for the high 32 bits, so only a single, aligned,
1729 * 4 GB physical address range can be used for descriptors.
1730 */
1731 if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
1732 dev_dbg(&pdev->dev, "DMA to 64-BIT addresses\n");
1733 } else {
1734 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
1735 if (err) {
1736 dev_err(&pdev->dev, "No usable DMA config, aborting\n");
1737 goto out_pci_disable;
1738 }
1739 }
1740
1741 err = pci_request_mem_regions(pdev, alx_drv_name);
1742 if (err) {
1743 dev_err(&pdev->dev,
1744 "pci_request_mem_regions failed\n");
1745 goto out_pci_disable;
1746 }
1747
1748 pci_enable_pcie_error_reporting(pdev);
1749 pci_set_master(pdev);
1750
1751 if (!pdev->pm_cap) {
1752 dev_err(&pdev->dev,
1753 "Can't find power management capability, aborting\n");
1754 err = -EIO;
1755 goto out_pci_release;
1756 }
1757
1758 netdev = alloc_etherdev_mqs(sizeof(*alx),
1759 ALX_MAX_TX_QUEUES, 1);
1760 if (!netdev) {
1761 err = -ENOMEM;
1762 goto out_pci_release;
1763 }
1764
1765 SET_NETDEV_DEV(netdev, &pdev->dev);
1766 alx = netdev_priv(netdev);
1767 spin_lock_init(&alx->hw.mdio_lock);
1768 spin_lock_init(&alx->irq_lock);
1769 spin_lock_init(&alx->stats_lock);
1770 alx->dev = netdev;
1771 alx->hw.pdev = pdev;
1772 alx->msg_enable = NETIF_MSG_LINK | NETIF_MSG_HW | NETIF_MSG_IFUP |
1773 NETIF_MSG_TX_ERR | NETIF_MSG_RX_ERR | NETIF_MSG_WOL;
1774 hw = &alx->hw;
1775 pci_set_drvdata(pdev, alx);
1776
1777 hw->hw_addr = pci_ioremap_bar(pdev, 0);
1778 if (!hw->hw_addr) {
1779 dev_err(&pdev->dev, "cannot map device registers\n");
1780 err = -EIO;
1781 goto out_free_netdev;
1782 }
1783
1784 netdev->netdev_ops = &alx_netdev_ops;
1785 netdev->ethtool_ops = &alx_ethtool_ops;
1786 netdev->irq = pci_irq_vector(pdev, 0);
1787 netdev->watchdog_timeo = ALX_WATCHDOG_TIME;
1788
1789 if (ent->driver_data & ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG)
1790 pdev->dev_flags |= PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG;
1791
1792 err = alx_init_sw(alx);
1793 if (err) {
1794 dev_err(&pdev->dev, "net device private data init failed\n");
1795 goto out_unmap;
1796 }
1797
1798 mutex_lock(&alx->mtx);
1799
1800 alx_reset_pcie(hw);
1801
1802 phy_configured = alx_phy_configured(hw);
1803
1804 if (!phy_configured)
1805 alx_reset_phy(hw);
1806
1807 err = alx_reset_mac(hw);
1808 if (err) {
1809 dev_err(&pdev->dev, "MAC Reset failed, error = %d\n", err);
1810 goto out_unlock;
1811 }
1812
1813 /* setup link to put it in a known good starting state */
1814 if (!phy_configured) {
1815 err = alx_setup_speed_duplex(hw, hw->adv_cfg, hw->flowctrl);
1816 if (err) {
1817 dev_err(&pdev->dev,
1818 "failed to configure PHY speed/duplex (err=%d)\n",
1819 err);
1820 goto out_unlock;
1821 }
1822 }
1823
1824 netdev->hw_features = NETIF_F_SG |
1825 NETIF_F_HW_CSUM |
1826 NETIF_F_RXCSUM |
1827 NETIF_F_TSO |
1828 NETIF_F_TSO6;
1829
1830 if (alx_get_perm_macaddr(hw, hw->perm_addr)) {
1831 dev_warn(&pdev->dev,
1832 "Invalid permanent address programmed, using random one\n");
1833 eth_hw_addr_random(netdev);
1834 memcpy(hw->perm_addr, netdev->dev_addr, netdev->addr_len);
1835 }
1836
1837 memcpy(hw->mac_addr, hw->perm_addr, ETH_ALEN);
1838 eth_hw_addr_set(netdev, hw->mac_addr);
1839 memcpy(netdev->perm_addr, hw->perm_addr, ETH_ALEN);
1840
1841 hw->mdio.prtad = 0;
1842 hw->mdio.mmds = 0;
1843 hw->mdio.dev = netdev;
1844 hw->mdio.mode_support = MDIO_SUPPORTS_C45 |
1845 MDIO_SUPPORTS_C22 |
1846 MDIO_EMULATE_C22;
1847 hw->mdio.mdio_read = alx_mdio_read;
1848 hw->mdio.mdio_write = alx_mdio_write;
1849
1850 if (!alx_get_phy_info(hw)) {
1851 dev_err(&pdev->dev, "failed to identify PHY\n");
1852 err = -EIO;
1853 goto out_unlock;
1854 }
1855
1856 mutex_unlock(&alx->mtx);
1857
1858 INIT_WORK(&alx->link_check_wk, alx_link_check);
1859 INIT_WORK(&alx->reset_wk, alx_reset);
1860 netif_carrier_off(netdev);
1861
1862 err = register_netdev(netdev);
1863 if (err) {
1864 dev_err(&pdev->dev, "register netdevice failed\n");
1865 goto out_unmap;
1866 }
1867
1868 netdev_info(netdev,
1869 "Qualcomm Atheros AR816x/AR817x Ethernet [%pM]\n",
1870 netdev->dev_addr);
1871
1872 return 0;
1873
1874out_unlock:
1875 mutex_unlock(&alx->mtx);
1876out_unmap:
1877 iounmap(hw->hw_addr);
1878out_free_netdev:
1879 free_netdev(netdev);
1880out_pci_release:
1881 pci_release_mem_regions(pdev);
1882 pci_disable_pcie_error_reporting(pdev);
1883out_pci_disable:
1884 pci_disable_device(pdev);
1885 return err;
1886}
1887
1888static void alx_remove(struct pci_dev *pdev)
1889{
1890 struct alx_priv *alx = pci_get_drvdata(pdev);
1891 struct alx_hw *hw = &alx->hw;
1892
1893 /* restore permanent mac address */
1894 alx_set_macaddr(hw, hw->perm_addr);
1895
1896 unregister_netdev(alx->dev);
1897 iounmap(hw->hw_addr);
1898 pci_release_mem_regions(pdev);
1899
1900 pci_disable_pcie_error_reporting(pdev);
1901 pci_disable_device(pdev);
1902
1903 mutex_destroy(&alx->mtx);
1904
1905 free_netdev(alx->dev);
1906}
1907
1908#ifdef CONFIG_PM_SLEEP
1909static int alx_suspend(struct device *dev)
1910{
1911 struct alx_priv *alx = dev_get_drvdata(dev);
1912
1913 if (!netif_running(alx->dev))
1914 return 0;
1915
1916 rtnl_lock();
1917 netif_device_detach(alx->dev);
1918
1919 mutex_lock(&alx->mtx);
1920 __alx_stop(alx);
1921 mutex_unlock(&alx->mtx);
1922 rtnl_unlock();
1923
1924 return 0;
1925}
1926
1927static int alx_resume(struct device *dev)
1928{
1929 struct alx_priv *alx = dev_get_drvdata(dev);
1930 struct alx_hw *hw = &alx->hw;
1931 int err;
1932
1933 rtnl_lock();
1934 mutex_lock(&alx->mtx);
1935 alx_reset_phy(hw);
1936
1937 if (!netif_running(alx->dev)) {
1938 err = 0;
1939 goto unlock;
1940 }
1941
1942 err = __alx_open(alx, true);
1943 if (err)
1944 goto unlock;
1945
1946 netif_device_attach(alx->dev);
1947
1948unlock:
1949 mutex_unlock(&alx->mtx);
1950 rtnl_unlock();
1951 return err;
1952}
1953
1954static SIMPLE_DEV_PM_OPS(alx_pm_ops, alx_suspend, alx_resume);
1955#define ALX_PM_OPS (&alx_pm_ops)
1956#else
1957#define ALX_PM_OPS NULL
1958#endif
1959
1960
1961static pci_ers_result_t alx_pci_error_detected(struct pci_dev *pdev,
1962 pci_channel_state_t state)
1963{
1964 struct alx_priv *alx = pci_get_drvdata(pdev);
1965 struct net_device *netdev = alx->dev;
1966 pci_ers_result_t rc = PCI_ERS_RESULT_NEED_RESET;
1967
1968 dev_info(&pdev->dev, "pci error detected\n");
1969
1970 mutex_lock(&alx->mtx);
1971
1972 if (netif_running(netdev)) {
1973 netif_device_detach(netdev);
1974 alx_halt(alx);
1975 }
1976
1977 if (state == pci_channel_io_perm_failure)
1978 rc = PCI_ERS_RESULT_DISCONNECT;
1979 else
1980 pci_disable_device(pdev);
1981
1982 mutex_unlock(&alx->mtx);
1983
1984 return rc;
1985}
1986
1987static pci_ers_result_t alx_pci_error_slot_reset(struct pci_dev *pdev)
1988{
1989 struct alx_priv *alx = pci_get_drvdata(pdev);
1990 struct alx_hw *hw = &alx->hw;
1991 pci_ers_result_t rc = PCI_ERS_RESULT_DISCONNECT;
1992
1993 dev_info(&pdev->dev, "pci error slot reset\n");
1994
1995 mutex_lock(&alx->mtx);
1996
1997 if (pci_enable_device(pdev)) {
1998 dev_err(&pdev->dev, "Failed to re-enable PCI device after reset\n");
1999 goto out;
2000 }
2001
2002 pci_set_master(pdev);
2003
2004 alx_reset_pcie(hw);
2005 if (!alx_reset_mac(hw))
2006 rc = PCI_ERS_RESULT_RECOVERED;
2007out:
2008 mutex_unlock(&alx->mtx);
2009
2010 return rc;
2011}
2012
2013static void alx_pci_error_resume(struct pci_dev *pdev)
2014{
2015 struct alx_priv *alx = pci_get_drvdata(pdev);
2016 struct net_device *netdev = alx->dev;
2017
2018 dev_info(&pdev->dev, "pci error resume\n");
2019
2020 mutex_lock(&alx->mtx);
2021
2022 if (netif_running(netdev)) {
2023 alx_activate(alx);
2024 netif_device_attach(netdev);
2025 }
2026
2027 mutex_unlock(&alx->mtx);
2028}
2029
2030static const struct pci_error_handlers alx_err_handlers = {
2031 .error_detected = alx_pci_error_detected,
2032 .slot_reset = alx_pci_error_slot_reset,
2033 .resume = alx_pci_error_resume,
2034};
2035
2036static const struct pci_device_id alx_pci_tbl[] = {
2037 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8161),
2038 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2039 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2200),
2040 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2041 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2400),
2042 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2043 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_E2500),
2044 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2045 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8162),
2046 .driver_data = ALX_DEV_QUIRK_MSI_INTX_DISABLE_BUG },
2047 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8171) },
2048 { PCI_VDEVICE(ATTANSIC, ALX_DEV_ID_AR8172) },
2049 {}
2050};
2051
2052static struct pci_driver alx_driver = {
2053 .name = alx_drv_name,
2054 .id_table = alx_pci_tbl,
2055 .probe = alx_probe,
2056 .remove = alx_remove,
2057 .err_handler = &alx_err_handlers,
2058 .driver.pm = ALX_PM_OPS,
2059};
2060
2061module_pci_driver(alx_driver);
2062MODULE_DEVICE_TABLE(pci, alx_pci_tbl);
2063MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
2064MODULE_AUTHOR("Qualcomm Corporation");
2065MODULE_DESCRIPTION(
2066 "Qualcomm Atheros(R) AR816x/AR817x PCI-E Ethernet Network Driver");
2067MODULE_LICENSE("GPL");