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1/*
2 * Copyright (c) 2012 Qualcomm Atheros, Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <linux/etherdevice.h>
18#include <net/ieee80211_radiotap.h>
19#include <linux/if_arp.h>
20#include <linux/moduleparam.h>
21#include <linux/ip.h>
22#include <linux/ipv6.h>
23#include <net/ipv6.h>
24#include <linux/prefetch.h>
25
26#include "wil6210.h"
27#include "wmi.h"
28#include "txrx.h"
29#include "trace.h"
30
31static bool rtap_include_phy_info;
32module_param(rtap_include_phy_info, bool, S_IRUGO);
33MODULE_PARM_DESC(rtap_include_phy_info,
34 " Include PHY info in the radiotap header, default - no");
35
36static inline int wil_vring_is_empty(struct vring *vring)
37{
38 return vring->swhead == vring->swtail;
39}
40
41static inline u32 wil_vring_next_tail(struct vring *vring)
42{
43 return (vring->swtail + 1) % vring->size;
44}
45
46static inline void wil_vring_advance_head(struct vring *vring, int n)
47{
48 vring->swhead = (vring->swhead + n) % vring->size;
49}
50
51static inline int wil_vring_is_full(struct vring *vring)
52{
53 return wil_vring_next_tail(vring) == vring->swhead;
54}
55/*
56 * Available space in Tx Vring
57 */
58static inline int wil_vring_avail_tx(struct vring *vring)
59{
60 u32 swhead = vring->swhead;
61 u32 swtail = vring->swtail;
62 int used = (vring->size + swhead - swtail) % vring->size;
63
64 return vring->size - used - 1;
65}
66
67static int wil_vring_alloc(struct wil6210_priv *wil, struct vring *vring)
68{
69 struct device *dev = wil_to_dev(wil);
70 size_t sz = vring->size * sizeof(vring->va[0]);
71 uint i;
72
73 BUILD_BUG_ON(sizeof(vring->va[0]) != 32);
74
75 vring->swhead = 0;
76 vring->swtail = 0;
77 vring->ctx = kcalloc(vring->size, sizeof(vring->ctx[0]), GFP_KERNEL);
78 if (!vring->ctx) {
79 vring->va = NULL;
80 return -ENOMEM;
81 }
82 /*
83 * vring->va should be aligned on its size rounded up to power of 2
84 * This is granted by the dma_alloc_coherent
85 */
86 vring->va = dma_alloc_coherent(dev, sz, &vring->pa, GFP_KERNEL);
87 if (!vring->va) {
88 kfree(vring->ctx);
89 vring->ctx = NULL;
90 return -ENOMEM;
91 }
92 /* initially, all descriptors are SW owned
93 * For Tx and Rx, ownership bit is at the same location, thus
94 * we can use any
95 */
96 for (i = 0; i < vring->size; i++) {
97 volatile struct vring_tx_desc *_d = &(vring->va[i].tx);
98 _d->dma.status = TX_DMA_STATUS_DU;
99 }
100
101 wil_dbg_misc(wil, "vring[%d] 0x%p:0x%016llx 0x%p\n", vring->size,
102 vring->va, (unsigned long long)vring->pa, vring->ctx);
103
104 return 0;
105}
106
107static void wil_txdesc_unmap(struct device *dev, struct vring_tx_desc *d,
108 struct wil_ctx *ctx)
109{
110 dma_addr_t pa = wil_desc_addr(&d->dma.addr);
111 u16 dmalen = le16_to_cpu(d->dma.length);
112 switch (ctx->mapped_as) {
113 case wil_mapped_as_single:
114 dma_unmap_single(dev, pa, dmalen, DMA_TO_DEVICE);
115 break;
116 case wil_mapped_as_page:
117 dma_unmap_page(dev, pa, dmalen, DMA_TO_DEVICE);
118 break;
119 default:
120 break;
121 }
122}
123
124static void wil_vring_free(struct wil6210_priv *wil, struct vring *vring,
125 int tx)
126{
127 struct device *dev = wil_to_dev(wil);
128 size_t sz = vring->size * sizeof(vring->va[0]);
129
130 while (!wil_vring_is_empty(vring)) {
131 dma_addr_t pa;
132 u16 dmalen;
133 struct wil_ctx *ctx;
134
135 if (tx) {
136 struct vring_tx_desc dd, *d = ⅆ
137 volatile struct vring_tx_desc *_d =
138 &vring->va[vring->swtail].tx;
139
140 ctx = &vring->ctx[vring->swtail];
141 *d = *_d;
142 wil_txdesc_unmap(dev, d, ctx);
143 if (ctx->skb)
144 dev_kfree_skb_any(ctx->skb);
145 vring->swtail = wil_vring_next_tail(vring);
146 } else { /* rx */
147 struct vring_rx_desc dd, *d = ⅆ
148 volatile struct vring_rx_desc *_d =
149 &vring->va[vring->swhead].rx;
150
151 ctx = &vring->ctx[vring->swhead];
152 *d = *_d;
153 pa = wil_desc_addr(&d->dma.addr);
154 dmalen = le16_to_cpu(d->dma.length);
155 dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
156 kfree_skb(ctx->skb);
157 wil_vring_advance_head(vring, 1);
158 }
159 }
160 dma_free_coherent(dev, sz, (void *)vring->va, vring->pa);
161 kfree(vring->ctx);
162 vring->pa = 0;
163 vring->va = NULL;
164 vring->ctx = NULL;
165}
166
167/**
168 * Allocate one skb for Rx VRING
169 *
170 * Safe to call from IRQ
171 */
172static int wil_vring_alloc_skb(struct wil6210_priv *wil, struct vring *vring,
173 u32 i, int headroom)
174{
175 struct device *dev = wil_to_dev(wil);
176 unsigned int sz = RX_BUF_LEN;
177 struct vring_rx_desc dd, *d = ⅆ
178 volatile struct vring_rx_desc *_d = &(vring->va[i].rx);
179 dma_addr_t pa;
180
181 /* TODO align */
182 struct sk_buff *skb = dev_alloc_skb(sz + headroom);
183 if (unlikely(!skb))
184 return -ENOMEM;
185
186 skb_reserve(skb, headroom);
187 skb_put(skb, sz);
188
189 pa = dma_map_single(dev, skb->data, skb->len, DMA_FROM_DEVICE);
190 if (unlikely(dma_mapping_error(dev, pa))) {
191 kfree_skb(skb);
192 return -ENOMEM;
193 }
194
195 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
196 wil_desc_addr_set(&d->dma.addr, pa);
197 /* ip_length don't care */
198 /* b11 don't care */
199 /* error don't care */
200 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
201 d->dma.length = cpu_to_le16(sz);
202 *_d = *d;
203 vring->ctx[i].skb = skb;
204
205 return 0;
206}
207
208/**
209 * Adds radiotap header
210 *
211 * Any error indicated as "Bad FCS"
212 *
213 * Vendor data for 04:ce:14-1 (Wilocity-1) consists of:
214 * - Rx descriptor: 32 bytes
215 * - Phy info
216 */
217static void wil_rx_add_radiotap_header(struct wil6210_priv *wil,
218 struct sk_buff *skb)
219{
220 struct wireless_dev *wdev = wil->wdev;
221 struct wil6210_rtap {
222 struct ieee80211_radiotap_header rthdr;
223 /* fields should be in the order of bits in rthdr.it_present */
224 /* flags */
225 u8 flags;
226 /* channel */
227 __le16 chnl_freq __aligned(2);
228 __le16 chnl_flags;
229 /* MCS */
230 u8 mcs_present;
231 u8 mcs_flags;
232 u8 mcs_index;
233 } __packed;
234 struct wil6210_rtap_vendor {
235 struct wil6210_rtap rtap;
236 /* vendor */
237 u8 vendor_oui[3] __aligned(2);
238 u8 vendor_ns;
239 __le16 vendor_skip;
240 u8 vendor_data[0];
241 } __packed;
242 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
243 struct wil6210_rtap_vendor *rtap_vendor;
244 int rtap_len = sizeof(struct wil6210_rtap);
245 int phy_length = 0; /* phy info header size, bytes */
246 static char phy_data[128];
247 struct ieee80211_channel *ch = wdev->preset_chandef.chan;
248
249 if (rtap_include_phy_info) {
250 rtap_len = sizeof(*rtap_vendor) + sizeof(*d);
251 /* calculate additional length */
252 if (d->dma.status & RX_DMA_STATUS_PHY_INFO) {
253 /**
254 * PHY info starts from 8-byte boundary
255 * there are 8-byte lines, last line may be partially
256 * written (HW bug), thus FW configures for last line
257 * to be excessive. Driver skips this last line.
258 */
259 int len = min_t(int, 8 + sizeof(phy_data),
260 wil_rxdesc_phy_length(d));
261 if (len > 8) {
262 void *p = skb_tail_pointer(skb);
263 void *pa = PTR_ALIGN(p, 8);
264 if (skb_tailroom(skb) >= len + (pa - p)) {
265 phy_length = len - 8;
266 memcpy(phy_data, pa, phy_length);
267 }
268 }
269 }
270 rtap_len += phy_length;
271 }
272
273 if (skb_headroom(skb) < rtap_len &&
274 pskb_expand_head(skb, rtap_len, 0, GFP_ATOMIC)) {
275 wil_err(wil, "Unable to expand headrom to %d\n", rtap_len);
276 return;
277 }
278
279 rtap_vendor = (void *)skb_push(skb, rtap_len);
280 memset(rtap_vendor, 0, rtap_len);
281
282 rtap_vendor->rtap.rthdr.it_version = PKTHDR_RADIOTAP_VERSION;
283 rtap_vendor->rtap.rthdr.it_len = cpu_to_le16(rtap_len);
284 rtap_vendor->rtap.rthdr.it_present = cpu_to_le32(
285 (1 << IEEE80211_RADIOTAP_FLAGS) |
286 (1 << IEEE80211_RADIOTAP_CHANNEL) |
287 (1 << IEEE80211_RADIOTAP_MCS));
288 if (d->dma.status & RX_DMA_STATUS_ERROR)
289 rtap_vendor->rtap.flags |= IEEE80211_RADIOTAP_F_BADFCS;
290
291 rtap_vendor->rtap.chnl_freq = cpu_to_le16(ch ? ch->center_freq : 58320);
292 rtap_vendor->rtap.chnl_flags = cpu_to_le16(0);
293
294 rtap_vendor->rtap.mcs_present = IEEE80211_RADIOTAP_MCS_HAVE_MCS;
295 rtap_vendor->rtap.mcs_flags = 0;
296 rtap_vendor->rtap.mcs_index = wil_rxdesc_mcs(d);
297
298 if (rtap_include_phy_info) {
299 rtap_vendor->rtap.rthdr.it_present |= cpu_to_le32(1 <<
300 IEEE80211_RADIOTAP_VENDOR_NAMESPACE);
301 /* OUI for Wilocity 04:ce:14 */
302 rtap_vendor->vendor_oui[0] = 0x04;
303 rtap_vendor->vendor_oui[1] = 0xce;
304 rtap_vendor->vendor_oui[2] = 0x14;
305 rtap_vendor->vendor_ns = 1;
306 /* Rx descriptor + PHY data */
307 rtap_vendor->vendor_skip = cpu_to_le16(sizeof(*d) +
308 phy_length);
309 memcpy(rtap_vendor->vendor_data, (void *)d, sizeof(*d));
310 memcpy(rtap_vendor->vendor_data + sizeof(*d), phy_data,
311 phy_length);
312 }
313}
314
315/*
316 * Fast swap in place between 2 registers
317 */
318static void wil_swap_u16(u16 *a, u16 *b)
319{
320 *a ^= *b;
321 *b ^= *a;
322 *a ^= *b;
323}
324
325static void wil_swap_ethaddr(void *data)
326{
327 struct ethhdr *eth = data;
328 u16 *s = (u16 *)eth->h_source;
329 u16 *d = (u16 *)eth->h_dest;
330
331 wil_swap_u16(s++, d++);
332 wil_swap_u16(s++, d++);
333 wil_swap_u16(s, d);
334}
335
336/**
337 * reap 1 frame from @swhead
338 *
339 * Rx descriptor copied to skb->cb
340 *
341 * Safe to call from IRQ
342 */
343static struct sk_buff *wil_vring_reap_rx(struct wil6210_priv *wil,
344 struct vring *vring)
345{
346 struct device *dev = wil_to_dev(wil);
347 struct net_device *ndev = wil_to_ndev(wil);
348 volatile struct vring_rx_desc *_d;
349 struct vring_rx_desc *d;
350 struct sk_buff *skb;
351 dma_addr_t pa;
352 unsigned int sz = RX_BUF_LEN;
353 u16 dmalen;
354 u8 ftype;
355 u8 ds_bits;
356 int cid;
357 struct wil_net_stats *stats;
358
359
360 BUILD_BUG_ON(sizeof(struct vring_rx_desc) > sizeof(skb->cb));
361
362 if (wil_vring_is_empty(vring))
363 return NULL;
364
365 _d = &(vring->va[vring->swhead].rx);
366 if (!(_d->dma.status & RX_DMA_STATUS_DU)) {
367 /* it is not error, we just reached end of Rx done area */
368 return NULL;
369 }
370
371 skb = vring->ctx[vring->swhead].skb;
372 d = wil_skb_rxdesc(skb);
373 *d = *_d;
374 pa = wil_desc_addr(&d->dma.addr);
375 vring->ctx[vring->swhead].skb = NULL;
376 wil_vring_advance_head(vring, 1);
377
378 dma_unmap_single(dev, pa, sz, DMA_FROM_DEVICE);
379 dmalen = le16_to_cpu(d->dma.length);
380
381 trace_wil6210_rx(vring->swhead, d);
382 wil_dbg_txrx(wil, "Rx[%3d] : %d bytes\n", vring->swhead, dmalen);
383 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_NONE, 32, 4,
384 (const void *)d, sizeof(*d), false);
385
386 if (dmalen > sz) {
387 wil_err(wil, "Rx size too large: %d bytes!\n", dmalen);
388 kfree_skb(skb);
389 return NULL;
390 }
391 skb_trim(skb, dmalen);
392
393 prefetch(skb->data);
394
395 wil_hex_dump_txrx("Rx ", DUMP_PREFIX_OFFSET, 16, 1,
396 skb->data, skb_headlen(skb), false);
397
398 cid = wil_rxdesc_cid(d);
399 stats = &wil->sta[cid].stats;
400 stats->last_mcs_rx = wil_rxdesc_mcs(d);
401 wil->stats.last_mcs_rx = stats->last_mcs_rx;
402
403 /* use radiotap header only if required */
404 if (ndev->type == ARPHRD_IEEE80211_RADIOTAP)
405 wil_rx_add_radiotap_header(wil, skb);
406
407 /* no extra checks if in sniffer mode */
408 if (ndev->type != ARPHRD_ETHER)
409 return skb;
410 /*
411 * Non-data frames may be delivered through Rx DMA channel (ex: BAR)
412 * Driver should recognize it by frame type, that is found
413 * in Rx descriptor. If type is not data, it is 802.11 frame as is
414 */
415 ftype = wil_rxdesc_ftype(d) << 2;
416 if (ftype != IEEE80211_FTYPE_DATA) {
417 wil_dbg_txrx(wil, "Non-data frame ftype 0x%08x\n", ftype);
418 /* TODO: process it */
419 kfree_skb(skb);
420 return NULL;
421 }
422
423 if (skb->len < ETH_HLEN) {
424 wil_err(wil, "Short frame, len = %d\n", skb->len);
425 /* TODO: process it (i.e. BAR) */
426 kfree_skb(skb);
427 return NULL;
428 }
429
430 /* L4 IDENT is on when HW calculated checksum, check status
431 * and in case of error drop the packet
432 * higher stack layers will handle retransmission (if required)
433 */
434 if (d->dma.status & RX_DMA_STATUS_L4_IDENT) {
435 /* L4 protocol identified, csum calculated */
436 if ((d->dma.error & RX_DMA_ERROR_L4_ERR) == 0)
437 skb->ip_summed = CHECKSUM_UNNECESSARY;
438 /* If HW reports bad checksum, let IP stack re-check it
439 * For example, HW don't understand Microsoft IP stack that
440 * mis-calculates TCP checksum - if it should be 0x0,
441 * it writes 0xffff in violation of RFC 1624
442 */
443 }
444
445 ds_bits = wil_rxdesc_ds_bits(d);
446 if (ds_bits == 1) {
447 /*
448 * HW bug - in ToDS mode, i.e. Rx on AP side,
449 * addresses get swapped
450 */
451 wil_swap_ethaddr(skb->data);
452 }
453
454 return skb;
455}
456
457/**
458 * allocate and fill up to @count buffers in rx ring
459 * buffers posted at @swtail
460 */
461static int wil_rx_refill(struct wil6210_priv *wil, int count)
462{
463 struct net_device *ndev = wil_to_ndev(wil);
464 struct vring *v = &wil->vring_rx;
465 u32 next_tail;
466 int rc = 0;
467 int headroom = ndev->type == ARPHRD_IEEE80211_RADIOTAP ?
468 WIL6210_RTAP_SIZE : 0;
469
470 for (; next_tail = wil_vring_next_tail(v),
471 (next_tail != v->swhead) && (count-- > 0);
472 v->swtail = next_tail) {
473 rc = wil_vring_alloc_skb(wil, v, v->swtail, headroom);
474 if (rc) {
475 wil_err(wil, "Error %d in wil_rx_refill[%d]\n",
476 rc, v->swtail);
477 break;
478 }
479 }
480 iowrite32(v->swtail, wil->csr + HOSTADDR(v->hwtail));
481
482 return rc;
483}
484
485/*
486 * Pass Rx packet to the netif. Update statistics.
487 * Called in softirq context (NAPI poll).
488 */
489void wil_netif_rx_any(struct sk_buff *skb, struct net_device *ndev)
490{
491 gro_result_t rc;
492 struct wil6210_priv *wil = ndev_to_wil(ndev);
493 unsigned int len = skb->len;
494 struct vring_rx_desc *d = wil_skb_rxdesc(skb);
495 int cid = wil_rxdesc_cid(d);
496 struct wil_net_stats *stats = &wil->sta[cid].stats;
497
498 skb_orphan(skb);
499
500 rc = napi_gro_receive(&wil->napi_rx, skb);
501
502 if (unlikely(rc == GRO_DROP)) {
503 ndev->stats.rx_dropped++;
504 stats->rx_dropped++;
505 wil_dbg_txrx(wil, "Rx drop %d bytes\n", len);
506 } else {
507 ndev->stats.rx_packets++;
508 stats->rx_packets++;
509 ndev->stats.rx_bytes += len;
510 stats->rx_bytes += len;
511 }
512}
513
514/**
515 * Proceed all completed skb's from Rx VRING
516 *
517 * Safe to call from NAPI poll, i.e. softirq with interrupts enabled
518 */
519void wil_rx_handle(struct wil6210_priv *wil, int *quota)
520{
521 struct net_device *ndev = wil_to_ndev(wil);
522 struct vring *v = &wil->vring_rx;
523 struct sk_buff *skb;
524
525 if (!v->va) {
526 wil_err(wil, "Rx IRQ while Rx not yet initialized\n");
527 return;
528 }
529 wil_dbg_txrx(wil, "%s()\n", __func__);
530 while ((*quota > 0) && (NULL != (skb = wil_vring_reap_rx(wil, v)))) {
531 (*quota)--;
532
533 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
534 skb->dev = ndev;
535 skb_reset_mac_header(skb);
536 skb->ip_summed = CHECKSUM_UNNECESSARY;
537 skb->pkt_type = PACKET_OTHERHOST;
538 skb->protocol = htons(ETH_P_802_2);
539 wil_netif_rx_any(skb, ndev);
540 } else {
541 struct ethhdr *eth = (void *)skb->data;
542
543 skb->protocol = eth_type_trans(skb, ndev);
544
545 if (is_unicast_ether_addr(eth->h_dest))
546 wil_rx_reorder(wil, skb);
547 else
548 wil_netif_rx_any(skb, ndev);
549 }
550
551 }
552 wil_rx_refill(wil, v->size);
553}
554
555int wil_rx_init(struct wil6210_priv *wil)
556{
557 struct vring *vring = &wil->vring_rx;
558 int rc;
559
560 if (vring->va) {
561 wil_err(wil, "Rx ring already allocated\n");
562 return -EINVAL;
563 }
564
565 vring->size = WIL6210_RX_RING_SIZE;
566 rc = wil_vring_alloc(wil, vring);
567 if (rc)
568 return rc;
569
570 rc = wmi_rx_chain_add(wil, vring);
571 if (rc)
572 goto err_free;
573
574 rc = wil_rx_refill(wil, vring->size);
575 if (rc)
576 goto err_free;
577
578 return 0;
579 err_free:
580 wil_vring_free(wil, vring, 0);
581
582 return rc;
583}
584
585void wil_rx_fini(struct wil6210_priv *wil)
586{
587 struct vring *vring = &wil->vring_rx;
588
589 if (vring->va)
590 wil_vring_free(wil, vring, 0);
591}
592
593int wil_vring_init_tx(struct wil6210_priv *wil, int id, int size,
594 int cid, int tid)
595{
596 int rc;
597 struct wmi_vring_cfg_cmd cmd = {
598 .action = cpu_to_le32(WMI_VRING_CMD_ADD),
599 .vring_cfg = {
600 .tx_sw_ring = {
601 .max_mpdu_size = cpu_to_le16(TX_BUF_LEN),
602 .ring_size = cpu_to_le16(size),
603 },
604 .ringid = id,
605 .cidxtid = mk_cidxtid(cid, tid),
606 .encap_trans_type = WMI_VRING_ENC_TYPE_802_3,
607 .mac_ctrl = 0,
608 .to_resolution = 0,
609 .agg_max_wsize = 16,
610 .schd_params = {
611 .priority = cpu_to_le16(0),
612 .timeslot_us = cpu_to_le16(0xfff),
613 },
614 },
615 };
616 struct {
617 struct wil6210_mbox_hdr_wmi wmi;
618 struct wmi_vring_cfg_done_event cmd;
619 } __packed reply;
620 struct vring *vring = &wil->vring_tx[id];
621 struct vring_tx_data *txdata = &wil->vring_tx_data[id];
622
623 if (vring->va) {
624 wil_err(wil, "Tx ring [%d] already allocated\n", id);
625 rc = -EINVAL;
626 goto out;
627 }
628
629 memset(txdata, 0, sizeof(*txdata));
630 vring->size = size;
631 rc = wil_vring_alloc(wil, vring);
632 if (rc)
633 goto out;
634
635 wil->vring2cid_tid[id][0] = cid;
636 wil->vring2cid_tid[id][1] = tid;
637
638 cmd.vring_cfg.tx_sw_ring.ring_mem_base = cpu_to_le64(vring->pa);
639
640 rc = wmi_call(wil, WMI_VRING_CFG_CMDID, &cmd, sizeof(cmd),
641 WMI_VRING_CFG_DONE_EVENTID, &reply, sizeof(reply), 100);
642 if (rc)
643 goto out_free;
644
645 if (reply.cmd.status != WMI_FW_STATUS_SUCCESS) {
646 wil_err(wil, "Tx config failed, status 0x%02x\n",
647 reply.cmd.status);
648 rc = -EINVAL;
649 goto out_free;
650 }
651 vring->hwtail = le32_to_cpu(reply.cmd.tx_vring_tail_ptr);
652
653 txdata->enabled = 1;
654
655 return 0;
656 out_free:
657 wil_vring_free(wil, vring, 1);
658 out:
659
660 return rc;
661}
662
663void wil_vring_fini_tx(struct wil6210_priv *wil, int id)
664{
665 struct vring *vring = &wil->vring_tx[id];
666
667 WARN_ON(!mutex_is_locked(&wil->mutex));
668
669 if (!vring->va)
670 return;
671
672 /* make sure NAPI won't touch this vring */
673 wil->vring_tx_data[id].enabled = 0;
674 if (test_bit(wil_status_napi_en, &wil->status))
675 napi_synchronize(&wil->napi_tx);
676
677 wil_vring_free(wil, vring, 1);
678}
679
680static struct vring *wil_find_tx_vring(struct wil6210_priv *wil,
681 struct sk_buff *skb)
682{
683 int i;
684 struct ethhdr *eth = (void *)skb->data;
685 int cid = wil_find_cid(wil, eth->h_dest);
686
687 if (cid < 0)
688 return NULL;
689
690 if (!wil->sta[cid].data_port_open &&
691 (skb->protocol != cpu_to_be16(ETH_P_PAE)))
692 return NULL;
693
694 /* TODO: fix for multiple TID */
695 for (i = 0; i < ARRAY_SIZE(wil->vring2cid_tid); i++) {
696 if (wil->vring2cid_tid[i][0] == cid) {
697 struct vring *v = &wil->vring_tx[i];
698 wil_dbg_txrx(wil, "%s(%pM) -> [%d]\n",
699 __func__, eth->h_dest, i);
700 if (v->va) {
701 return v;
702 } else {
703 wil_dbg_txrx(wil, "vring[%d] not valid\n", i);
704 return NULL;
705 }
706 }
707 }
708
709 return NULL;
710}
711
712static void wil_set_da_for_vring(struct wil6210_priv *wil,
713 struct sk_buff *skb, int vring_index)
714{
715 struct ethhdr *eth = (void *)skb->data;
716 int cid = wil->vring2cid_tid[vring_index][0];
717 memcpy(eth->h_dest, wil->sta[cid].addr, ETH_ALEN);
718}
719
720static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
721 struct sk_buff *skb);
722/*
723 * Find 1-st vring and return it; set dest address for this vring in skb
724 * duplicate skb and send it to other active vrings
725 */
726static struct vring *wil_tx_bcast(struct wil6210_priv *wil,
727 struct sk_buff *skb)
728{
729 struct vring *v, *v2;
730 struct sk_buff *skb2;
731 int i;
732 u8 cid;
733
734 /* find 1-st vring eligible for data */
735 for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
736 v = &wil->vring_tx[i];
737 if (!v->va)
738 continue;
739
740 cid = wil->vring2cid_tid[i][0];
741 if (!wil->sta[cid].data_port_open)
742 continue;
743
744 goto found;
745 }
746
747 wil_err(wil, "Tx while no vrings active?\n");
748
749 return NULL;
750
751found:
752 wil_dbg_txrx(wil, "BCAST -> ring %d\n", i);
753 wil_set_da_for_vring(wil, skb, i);
754
755 /* find other active vrings and duplicate skb for each */
756 for (i++; i < WIL6210_MAX_TX_RINGS; i++) {
757 v2 = &wil->vring_tx[i];
758 if (!v2->va)
759 continue;
760 cid = wil->vring2cid_tid[i][0];
761 if (!wil->sta[cid].data_port_open)
762 continue;
763
764 skb2 = skb_copy(skb, GFP_ATOMIC);
765 if (skb2) {
766 wil_dbg_txrx(wil, "BCAST DUP -> ring %d\n", i);
767 wil_set_da_for_vring(wil, skb2, i);
768 wil_tx_vring(wil, v2, skb2);
769 } else {
770 wil_err(wil, "skb_copy failed\n");
771 }
772 }
773
774 return v;
775}
776
777static int wil_tx_desc_map(struct vring_tx_desc *d, dma_addr_t pa, u32 len,
778 int vring_index)
779{
780 wil_desc_addr_set(&d->dma.addr, pa);
781 d->dma.ip_length = 0;
782 /* 0..6: mac_length; 7:ip_version 0-IP6 1-IP4*/
783 d->dma.b11 = 0/*14 | BIT(7)*/;
784 d->dma.error = 0;
785 d->dma.status = 0; /* BIT(0) should be 0 for HW_OWNED */
786 d->dma.length = cpu_to_le16((u16)len);
787 d->dma.d0 = (vring_index << DMA_CFG_DESC_TX_0_QID_POS);
788 d->mac.d[0] = 0;
789 d->mac.d[1] = 0;
790 d->mac.d[2] = 0;
791 d->mac.ucode_cmd = 0;
792 /* use dst index 0 */
793 d->mac.d[1] |= BIT(MAC_CFG_DESC_TX_1_DST_INDEX_EN_POS) |
794 (0 << MAC_CFG_DESC_TX_1_DST_INDEX_POS);
795 /* translation type: 0 - bypass; 1 - 802.3; 2 - native wifi */
796 d->mac.d[2] = BIT(MAC_CFG_DESC_TX_2_SNAP_HDR_INSERTION_EN_POS) |
797 (1 << MAC_CFG_DESC_TX_2_L2_TRANSLATION_TYPE_POS);
798
799 return 0;
800}
801
802static inline
803void wil_tx_desc_set_nr_frags(struct vring_tx_desc *d, int nr_frags)
804{
805 d->mac.d[2] |= ((nr_frags + 1) <<
806 MAC_CFG_DESC_TX_2_NUM_OF_DESCRIPTORS_POS);
807}
808
809static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
810 struct vring_tx_desc *d,
811 struct sk_buff *skb)
812{
813 int protocol;
814
815 if (skb->ip_summed != CHECKSUM_PARTIAL)
816 return 0;
817
818 d->dma.b11 = ETH_HLEN; /* MAC header length */
819
820 switch (skb->protocol) {
821 case cpu_to_be16(ETH_P_IP):
822 protocol = ip_hdr(skb)->protocol;
823 d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
824 break;
825 case cpu_to_be16(ETH_P_IPV6):
826 protocol = ipv6_hdr(skb)->nexthdr;
827 break;
828 default:
829 return -EINVAL;
830 }
831
832 switch (protocol) {
833 case IPPROTO_TCP:
834 d->dma.d0 |= (2 << DMA_CFG_DESC_TX_0_L4_TYPE_POS);
835 /* L4 header len: TCP header length */
836 d->dma.d0 |=
837 (tcp_hdrlen(skb) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
838 break;
839 case IPPROTO_UDP:
840 /* L4 header len: UDP header length */
841 d->dma.d0 |=
842 (sizeof(struct udphdr) & DMA_CFG_DESC_TX_0_L4_LENGTH_MSK);
843 break;
844 default:
845 return -EINVAL;
846 }
847
848 d->dma.ip_length = skb_network_header_len(skb);
849 /* Enable TCP/UDP checksum */
850 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
851 /* Calculate pseudo-header */
852 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_PSEUDO_HEADER_CALC_EN_POS);
853
854 return 0;
855}
856
857static int wil_tx_vring(struct wil6210_priv *wil, struct vring *vring,
858 struct sk_buff *skb)
859{
860 struct device *dev = wil_to_dev(wil);
861 struct vring_tx_desc dd, *d = ⅆ
862 volatile struct vring_tx_desc *_d;
863 u32 swhead = vring->swhead;
864 int avail = wil_vring_avail_tx(vring);
865 int nr_frags = skb_shinfo(skb)->nr_frags;
866 uint f = 0;
867 int vring_index = vring - wil->vring_tx;
868 uint i = swhead;
869 dma_addr_t pa;
870
871 wil_dbg_txrx(wil, "%s()\n", __func__);
872
873 if (avail < 1 + nr_frags) {
874 wil_err(wil, "Tx ring full. No space for %d fragments\n",
875 1 + nr_frags);
876 return -ENOMEM;
877 }
878 _d = &(vring->va[i].tx);
879
880 pa = dma_map_single(dev, skb->data,
881 skb_headlen(skb), DMA_TO_DEVICE);
882
883 wil_dbg_txrx(wil, "Tx skb %d bytes %p -> %#08llx\n", skb_headlen(skb),
884 skb->data, (unsigned long long)pa);
885 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_OFFSET, 16, 1,
886 skb->data, skb_headlen(skb), false);
887
888 if (unlikely(dma_mapping_error(dev, pa)))
889 return -EINVAL;
890 vring->ctx[i].mapped_as = wil_mapped_as_single;
891 /* 1-st segment */
892 wil_tx_desc_map(d, pa, skb_headlen(skb), vring_index);
893 /* Process TCP/UDP checksum offloading */
894 if (wil_tx_desc_offload_cksum_set(wil, d, skb)) {
895 wil_err(wil, "VRING #%d Failed to set cksum, drop packet\n",
896 vring_index);
897 goto dma_error;
898 }
899
900 vring->ctx[i].nr_frags = nr_frags;
901 wil_tx_desc_set_nr_frags(d, nr_frags);
902 if (nr_frags)
903 *_d = *d;
904
905 /* middle segments */
906 for (; f < nr_frags; f++) {
907 const struct skb_frag_struct *frag =
908 &skb_shinfo(skb)->frags[f];
909 int len = skb_frag_size(frag);
910 i = (swhead + f + 1) % vring->size;
911 _d = &(vring->va[i].tx);
912 pa = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
913 DMA_TO_DEVICE);
914 if (unlikely(dma_mapping_error(dev, pa)))
915 goto dma_error;
916 vring->ctx[i].mapped_as = wil_mapped_as_page;
917 wil_tx_desc_map(d, pa, len, vring_index);
918 /* no need to check return code -
919 * if it succeeded for 1-st descriptor,
920 * it will succeed here too
921 */
922 wil_tx_desc_offload_cksum_set(wil, d, skb);
923 *_d = *d;
924 }
925 /* for the last seg only */
926 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_EOP_POS);
927 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_MARK_WB_POS);
928 d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_CMD_DMA_IT_POS);
929 *_d = *d;
930
931 /* hold reference to skb
932 * to prevent skb release before accounting
933 * in case of immediate "tx done"
934 */
935 vring->ctx[i].skb = skb_get(skb);
936
937 wil_hex_dump_txrx("Tx ", DUMP_PREFIX_NONE, 32, 4,
938 (const void *)d, sizeof(*d), false);
939
940 /* advance swhead */
941 wil_vring_advance_head(vring, nr_frags + 1);
942 wil_dbg_txrx(wil, "Tx swhead %d -> %d\n", swhead, vring->swhead);
943 trace_wil6210_tx(vring_index, swhead, skb->len, nr_frags);
944 iowrite32(vring->swhead, wil->csr + HOSTADDR(vring->hwtail));
945
946 return 0;
947 dma_error:
948 /* unmap what we have mapped */
949 nr_frags = f + 1; /* frags mapped + one for skb head */
950 for (f = 0; f < nr_frags; f++) {
951 struct wil_ctx *ctx;
952
953 i = (swhead + f) % vring->size;
954 ctx = &vring->ctx[i];
955 _d = &(vring->va[i].tx);
956 *d = *_d;
957 _d->dma.status = TX_DMA_STATUS_DU;
958 wil_txdesc_unmap(dev, d, ctx);
959
960 if (ctx->skb)
961 dev_kfree_skb_any(ctx->skb);
962
963 memset(ctx, 0, sizeof(*ctx));
964 }
965
966 return -EINVAL;
967}
968
969
970netdev_tx_t wil_start_xmit(struct sk_buff *skb, struct net_device *ndev)
971{
972 struct wil6210_priv *wil = ndev_to_wil(ndev);
973 struct ethhdr *eth = (void *)skb->data;
974 struct vring *vring;
975 static bool pr_once_fw;
976 int rc;
977
978 wil_dbg_txrx(wil, "%s()\n", __func__);
979 if (!test_bit(wil_status_fwready, &wil->status)) {
980 if (!pr_once_fw) {
981 wil_err(wil, "FW not ready\n");
982 pr_once_fw = true;
983 }
984 goto drop;
985 }
986 if (!test_bit(wil_status_fwconnected, &wil->status)) {
987 wil_err(wil, "FW not connected\n");
988 goto drop;
989 }
990 if (wil->wdev->iftype == NL80211_IFTYPE_MONITOR) {
991 wil_err(wil, "Xmit in monitor mode not supported\n");
992 goto drop;
993 }
994 pr_once_fw = false;
995
996 /* find vring */
997 if (is_unicast_ether_addr(eth->h_dest)) {
998 vring = wil_find_tx_vring(wil, skb);
999 } else {
1000 vring = wil_tx_bcast(wil, skb);
1001 }
1002 if (!vring) {
1003 wil_err(wil, "No Tx VRING found for %pM\n", eth->h_dest);
1004 goto drop;
1005 }
1006 /* set up vring entry */
1007 rc = wil_tx_vring(wil, vring, skb);
1008
1009 /* do we still have enough room in the vring? */
1010 if (wil_vring_avail_tx(vring) < vring->size/8)
1011 netif_tx_stop_all_queues(wil_to_ndev(wil));
1012
1013 switch (rc) {
1014 case 0:
1015 /* statistics will be updated on the tx_complete */
1016 dev_kfree_skb_any(skb);
1017 return NETDEV_TX_OK;
1018 case -ENOMEM:
1019 return NETDEV_TX_BUSY;
1020 default:
1021 break; /* goto drop; */
1022 }
1023 drop:
1024 ndev->stats.tx_dropped++;
1025 dev_kfree_skb_any(skb);
1026
1027 return NET_XMIT_DROP;
1028}
1029
1030/**
1031 * Clean up transmitted skb's from the Tx VRING
1032 *
1033 * Return number of descriptors cleared
1034 *
1035 * Safe to call from IRQ
1036 */
1037int wil_tx_complete(struct wil6210_priv *wil, int ringid)
1038{
1039 struct net_device *ndev = wil_to_ndev(wil);
1040 struct device *dev = wil_to_dev(wil);
1041 struct vring *vring = &wil->vring_tx[ringid];
1042 struct vring_tx_data *txdata = &wil->vring_tx_data[ringid];
1043 int done = 0;
1044 int cid = wil->vring2cid_tid[ringid][0];
1045 struct wil_net_stats *stats = &wil->sta[cid].stats;
1046 volatile struct vring_tx_desc *_d;
1047
1048 if (!vring->va) {
1049 wil_err(wil, "Tx irq[%d]: vring not initialized\n", ringid);
1050 return 0;
1051 }
1052
1053 if (!txdata->enabled) {
1054 wil_info(wil, "Tx irq[%d]: vring disabled\n", ringid);
1055 return 0;
1056 }
1057
1058 wil_dbg_txrx(wil, "%s(%d)\n", __func__, ringid);
1059
1060 while (!wil_vring_is_empty(vring)) {
1061 int new_swtail;
1062 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1063 /**
1064 * For the fragmented skb, HW will set DU bit only for the
1065 * last fragment. look for it
1066 */
1067 int lf = (vring->swtail + ctx->nr_frags) % vring->size;
1068 /* TODO: check we are not past head */
1069
1070 _d = &vring->va[lf].tx;
1071 if (!(_d->dma.status & TX_DMA_STATUS_DU))
1072 break;
1073
1074 new_swtail = (lf + 1) % vring->size;
1075 while (vring->swtail != new_swtail) {
1076 struct vring_tx_desc dd, *d = ⅆ
1077 u16 dmalen;
1078 struct wil_ctx *ctx = &vring->ctx[vring->swtail];
1079 struct sk_buff *skb = ctx->skb;
1080 _d = &vring->va[vring->swtail].tx;
1081
1082 *d = *_d;
1083
1084 dmalen = le16_to_cpu(d->dma.length);
1085 trace_wil6210_tx_done(ringid, vring->swtail, dmalen,
1086 d->dma.error);
1087 wil_dbg_txrx(wil,
1088 "Tx[%3d] : %d bytes, status 0x%02x err 0x%02x\n",
1089 vring->swtail, dmalen, d->dma.status,
1090 d->dma.error);
1091 wil_hex_dump_txrx("TxC ", DUMP_PREFIX_NONE, 32, 4,
1092 (const void *)d, sizeof(*d), false);
1093
1094 wil_txdesc_unmap(dev, d, ctx);
1095
1096 if (skb) {
1097 if (d->dma.error == 0) {
1098 ndev->stats.tx_packets++;
1099 stats->tx_packets++;
1100 ndev->stats.tx_bytes += skb->len;
1101 stats->tx_bytes += skb->len;
1102 } else {
1103 ndev->stats.tx_errors++;
1104 stats->tx_errors++;
1105 }
1106
1107 dev_kfree_skb_any(skb);
1108 }
1109 memset(ctx, 0, sizeof(*ctx));
1110 /* There is no need to touch HW descriptor:
1111 * - ststus bit TX_DMA_STATUS_DU is set by design,
1112 * so hardware will not try to process this desc.,
1113 * - rest of descriptor will be initialized on Tx.
1114 */
1115 vring->swtail = wil_vring_next_tail(vring);
1116 done++;
1117 }
1118 }
1119 if (wil_vring_avail_tx(vring) > vring->size/4)
1120 netif_tx_wake_all_queues(wil_to_ndev(wil));
1121
1122 return done;
1123}