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1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2010-2012 Solarflare Communications Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
8 */
9#include <linux/pci.h>
10#include <linux/module.h>
11#include "net_driver.h"
12#include "efx.h"
13#include "nic.h"
14#include "io.h"
15#include "mcdi.h"
16#include "filter.h"
17#include "mcdi_pcol.h"
18#include "farch_regs.h"
19#include "siena_sriov.h"
20#include "vfdi.h"
21
22/* Number of longs required to track all the VIs in a VF */
23#define VI_MASK_LENGTH BITS_TO_LONGS(1 << EFX_VI_SCALE_MAX)
24
25/* Maximum number of RX queues supported */
26#define VF_MAX_RX_QUEUES 63
27
28/**
29 * enum efx_vf_tx_filter_mode - TX MAC filtering behaviour
30 * @VF_TX_FILTER_OFF: Disabled
31 * @VF_TX_FILTER_AUTO: Enabled if MAC address assigned to VF and only
32 * 2 TX queues allowed per VF.
33 * @VF_TX_FILTER_ON: Enabled
34 */
35enum efx_vf_tx_filter_mode {
36 VF_TX_FILTER_OFF,
37 VF_TX_FILTER_AUTO,
38 VF_TX_FILTER_ON,
39};
40
41/**
42 * struct siena_vf - Back-end resource and protocol state for a PCI VF
43 * @efx: The Efx NIC owning this VF
44 * @pci_rid: The PCI requester ID for this VF
45 * @pci_name: The PCI name (formatted address) of this VF
46 * @index: Index of VF within its port and PF.
47 * @req: VFDI incoming request work item. Incoming USR_EV events are received
48 * by the NAPI handler, but must be handled by executing MCDI requests
49 * inside a work item.
50 * @req_addr: VFDI incoming request DMA address (in VF's PCI address space).
51 * @req_type: Expected next incoming (from VF) %VFDI_EV_TYPE member.
52 * @req_seqno: Expected next incoming (from VF) %VFDI_EV_SEQ member.
53 * @msg_seqno: Next %VFDI_EV_SEQ member to reply to VF. Protected by
54 * @status_lock
55 * @busy: VFDI request queued to be processed or being processed. Receiving
56 * a VFDI request when @busy is set is an error condition.
57 * @buf: Incoming VFDI requests are DMA from the VF into this buffer.
58 * @buftbl_base: Buffer table entries for this VF start at this index.
59 * @rx_filtering: Receive filtering has been requested by the VF driver.
60 * @rx_filter_flags: The flags sent in the %VFDI_OP_INSERT_FILTER request.
61 * @rx_filter_qid: VF relative qid for RX filter requested by VF.
62 * @rx_filter_id: Receive MAC filter ID. Only one filter per VF is supported.
63 * @tx_filter_mode: Transmit MAC filtering mode.
64 * @tx_filter_id: Transmit MAC filter ID.
65 * @addr: The MAC address and outer vlan tag of the VF.
66 * @status_addr: VF DMA address of page for &struct vfdi_status updates.
67 * @status_lock: Mutex protecting @msg_seqno, @status_addr, @addr,
68 * @peer_page_addrs and @peer_page_count from simultaneous
69 * updates by the VM and consumption by
70 * efx_siena_sriov_update_vf_addr()
71 * @peer_page_addrs: Pointer to an array of guest pages for local addresses.
72 * @peer_page_count: Number of entries in @peer_page_count.
73 * @evq0_addrs: Array of guest pages backing evq0.
74 * @evq0_count: Number of entries in @evq0_addrs.
75 * @flush_waitq: wait queue used by %VFDI_OP_FINI_ALL_QUEUES handler
76 * to wait for flush completions.
77 * @txq_lock: Mutex for TX queue allocation.
78 * @txq_mask: Mask of initialized transmit queues.
79 * @txq_count: Number of initialized transmit queues.
80 * @rxq_mask: Mask of initialized receive queues.
81 * @rxq_count: Number of initialized receive queues.
82 * @rxq_retry_mask: Mask or receive queues that need to be flushed again
83 * due to flush failure.
84 * @rxq_retry_count: Number of receive queues in @rxq_retry_mask.
85 * @reset_work: Work item to schedule a VF reset.
86 */
87struct siena_vf {
88 struct efx_nic *efx;
89 unsigned int pci_rid;
90 char pci_name[13]; /* dddd:bb:dd.f */
91 unsigned int index;
92 struct work_struct req;
93 u64 req_addr;
94 int req_type;
95 unsigned req_seqno;
96 unsigned msg_seqno;
97 bool busy;
98 struct efx_buffer buf;
99 unsigned buftbl_base;
100 bool rx_filtering;
101 enum efx_filter_flags rx_filter_flags;
102 unsigned rx_filter_qid;
103 int rx_filter_id;
104 enum efx_vf_tx_filter_mode tx_filter_mode;
105 int tx_filter_id;
106 struct vfdi_endpoint addr;
107 u64 status_addr;
108 struct mutex status_lock;
109 u64 *peer_page_addrs;
110 unsigned peer_page_count;
111 u64 evq0_addrs[EFX_MAX_VF_EVQ_SIZE * sizeof(efx_qword_t) /
112 EFX_BUF_SIZE];
113 unsigned evq0_count;
114 wait_queue_head_t flush_waitq;
115 struct mutex txq_lock;
116 unsigned long txq_mask[VI_MASK_LENGTH];
117 unsigned txq_count;
118 unsigned long rxq_mask[VI_MASK_LENGTH];
119 unsigned rxq_count;
120 unsigned long rxq_retry_mask[VI_MASK_LENGTH];
121 atomic_t rxq_retry_count;
122 struct work_struct reset_work;
123};
124
125struct efx_memcpy_req {
126 unsigned int from_rid;
127 void *from_buf;
128 u64 from_addr;
129 unsigned int to_rid;
130 u64 to_addr;
131 unsigned length;
132};
133
134/**
135 * struct efx_local_addr - A MAC address on the vswitch without a VF.
136 *
137 * Siena does not have a switch, so VFs can't transmit data to each
138 * other. Instead the VFs must be made aware of the local addresses
139 * on the vswitch, so that they can arrange for an alternative
140 * software datapath to be used.
141 *
142 * @link: List head for insertion into efx->local_addr_list.
143 * @addr: Ethernet address
144 */
145struct efx_local_addr {
146 struct list_head link;
147 u8 addr[ETH_ALEN];
148};
149
150/**
151 * struct efx_endpoint_page - Page of vfdi_endpoint structures
152 *
153 * @link: List head for insertion into efx->local_page_list.
154 * @ptr: Pointer to page.
155 * @addr: DMA address of page.
156 */
157struct efx_endpoint_page {
158 struct list_head link;
159 void *ptr;
160 dma_addr_t addr;
161};
162
163/* Buffer table entries are reserved txq0,rxq0,evq0,txq1,rxq1,evq1 */
164#define EFX_BUFTBL_TXQ_BASE(_vf, _qid) \
165 ((_vf)->buftbl_base + EFX_VF_BUFTBL_PER_VI * (_qid))
166#define EFX_BUFTBL_RXQ_BASE(_vf, _qid) \
167 (EFX_BUFTBL_TXQ_BASE(_vf, _qid) + \
168 (EFX_MAX_DMAQ_SIZE * sizeof(efx_qword_t) / EFX_BUF_SIZE))
169#define EFX_BUFTBL_EVQ_BASE(_vf, _qid) \
170 (EFX_BUFTBL_TXQ_BASE(_vf, _qid) + \
171 (2 * EFX_MAX_DMAQ_SIZE * sizeof(efx_qword_t) / EFX_BUF_SIZE))
172
173#define EFX_FIELD_MASK(_field) \
174 ((1 << _field ## _WIDTH) - 1)
175
176/* VFs can only use this many transmit channels */
177static unsigned int vf_max_tx_channels = 2;
178module_param(vf_max_tx_channels, uint, 0444);
179MODULE_PARM_DESC(vf_max_tx_channels,
180 "Limit the number of TX channels VFs can use");
181
182static int max_vfs = -1;
183module_param(max_vfs, int, 0444);
184MODULE_PARM_DESC(max_vfs,
185 "Reduce the number of VFs initialized by the driver");
186
187/* Workqueue used by VFDI communication. We can't use the global
188 * workqueue because it may be running the VF driver's probe()
189 * routine, which will be blocked there waiting for a VFDI response.
190 */
191static struct workqueue_struct *vfdi_workqueue;
192
193static unsigned abs_index(struct siena_vf *vf, unsigned index)
194{
195 return EFX_VI_BASE + vf->index * efx_vf_size(vf->efx) + index;
196}
197
198static int efx_siena_sriov_cmd(struct efx_nic *efx, bool enable,
199 unsigned *vi_scale_out, unsigned *vf_total_out)
200{
201 MCDI_DECLARE_BUF(inbuf, MC_CMD_SRIOV_IN_LEN);
202 MCDI_DECLARE_BUF(outbuf, MC_CMD_SRIOV_OUT_LEN);
203 unsigned vi_scale, vf_total;
204 size_t outlen;
205 int rc;
206
207 MCDI_SET_DWORD(inbuf, SRIOV_IN_ENABLE, enable ? 1 : 0);
208 MCDI_SET_DWORD(inbuf, SRIOV_IN_VI_BASE, EFX_VI_BASE);
209 MCDI_SET_DWORD(inbuf, SRIOV_IN_VF_COUNT, efx->vf_count);
210
211 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_SRIOV, inbuf, MC_CMD_SRIOV_IN_LEN,
212 outbuf, MC_CMD_SRIOV_OUT_LEN, &outlen);
213 if (rc)
214 return rc;
215 if (outlen < MC_CMD_SRIOV_OUT_LEN)
216 return -EIO;
217
218 vf_total = MCDI_DWORD(outbuf, SRIOV_OUT_VF_TOTAL);
219 vi_scale = MCDI_DWORD(outbuf, SRIOV_OUT_VI_SCALE);
220 if (vi_scale > EFX_VI_SCALE_MAX)
221 return -EOPNOTSUPP;
222
223 if (vi_scale_out)
224 *vi_scale_out = vi_scale;
225 if (vf_total_out)
226 *vf_total_out = vf_total;
227
228 return 0;
229}
230
231static void efx_siena_sriov_usrev(struct efx_nic *efx, bool enabled)
232{
233 struct siena_nic_data *nic_data = efx->nic_data;
234 efx_oword_t reg;
235
236 EFX_POPULATE_OWORD_2(reg,
237 FRF_CZ_USREV_DIS, enabled ? 0 : 1,
238 FRF_CZ_DFLT_EVQ, nic_data->vfdi_channel->channel);
239 efx_writeo(efx, ®, FR_CZ_USR_EV_CFG);
240}
241
242static int efx_siena_sriov_memcpy(struct efx_nic *efx,
243 struct efx_memcpy_req *req,
244 unsigned int count)
245{
246 MCDI_DECLARE_BUF(inbuf, MCDI_CTL_SDU_LEN_MAX_V1);
247 MCDI_DECLARE_STRUCT_PTR(record);
248 unsigned int index, used;
249 u64 from_addr;
250 u32 from_rid;
251 int rc;
252
253 mb(); /* Finish writing source/reading dest before DMA starts */
254
255 if (WARN_ON(count > MC_CMD_MEMCPY_IN_RECORD_MAXNUM))
256 return -ENOBUFS;
257 used = MC_CMD_MEMCPY_IN_LEN(count);
258
259 for (index = 0; index < count; index++) {
260 record = MCDI_ARRAY_STRUCT_PTR(inbuf, MEMCPY_IN_RECORD, index);
261 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_NUM_RECORDS,
262 count);
263 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_TO_RID,
264 req->to_rid);
265 MCDI_SET_QWORD(record, MEMCPY_RECORD_TYPEDEF_TO_ADDR,
266 req->to_addr);
267 if (req->from_buf == NULL) {
268 from_rid = req->from_rid;
269 from_addr = req->from_addr;
270 } else {
271 if (WARN_ON(used + req->length >
272 MCDI_CTL_SDU_LEN_MAX_V1)) {
273 rc = -ENOBUFS;
274 goto out;
275 }
276
277 from_rid = MC_CMD_MEMCPY_RECORD_TYPEDEF_RID_INLINE;
278 from_addr = used;
279 memcpy(_MCDI_PTR(inbuf, used), req->from_buf,
280 req->length);
281 used += req->length;
282 }
283
284 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_FROM_RID, from_rid);
285 MCDI_SET_QWORD(record, MEMCPY_RECORD_TYPEDEF_FROM_ADDR,
286 from_addr);
287 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_LENGTH,
288 req->length);
289
290 ++req;
291 }
292
293 rc = efx_mcdi_rpc(efx, MC_CMD_MEMCPY, inbuf, used, NULL, 0, NULL);
294out:
295 mb(); /* Don't write source/read dest before DMA is complete */
296
297 return rc;
298}
299
300/* The TX filter is entirely controlled by this driver, and is modified
301 * underneath the feet of the VF
302 */
303static void efx_siena_sriov_reset_tx_filter(struct siena_vf *vf)
304{
305 struct efx_nic *efx = vf->efx;
306 struct efx_filter_spec filter;
307 u16 vlan;
308 int rc;
309
310 if (vf->tx_filter_id != -1) {
311 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
312 vf->tx_filter_id);
313 netif_dbg(efx, hw, efx->net_dev, "Removed vf %s tx filter %d\n",
314 vf->pci_name, vf->tx_filter_id);
315 vf->tx_filter_id = -1;
316 }
317
318 if (is_zero_ether_addr(vf->addr.mac_addr))
319 return;
320
321 /* Turn on TX filtering automatically if not explicitly
322 * enabled or disabled.
323 */
324 if (vf->tx_filter_mode == VF_TX_FILTER_AUTO && vf_max_tx_channels <= 2)
325 vf->tx_filter_mode = VF_TX_FILTER_ON;
326
327 vlan = ntohs(vf->addr.tci) & VLAN_VID_MASK;
328 efx_filter_init_tx(&filter, abs_index(vf, 0));
329 rc = efx_filter_set_eth_local(&filter,
330 vlan ? vlan : EFX_FILTER_VID_UNSPEC,
331 vf->addr.mac_addr);
332 BUG_ON(rc);
333
334 rc = efx_filter_insert_filter(efx, &filter, true);
335 if (rc < 0) {
336 netif_warn(efx, hw, efx->net_dev,
337 "Unable to migrate tx filter for vf %s\n",
338 vf->pci_name);
339 } else {
340 netif_dbg(efx, hw, efx->net_dev, "Inserted vf %s tx filter %d\n",
341 vf->pci_name, rc);
342 vf->tx_filter_id = rc;
343 }
344}
345
346/* The RX filter is managed here on behalf of the VF driver */
347static void efx_siena_sriov_reset_rx_filter(struct siena_vf *vf)
348{
349 struct efx_nic *efx = vf->efx;
350 struct efx_filter_spec filter;
351 u16 vlan;
352 int rc;
353
354 if (vf->rx_filter_id != -1) {
355 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
356 vf->rx_filter_id);
357 netif_dbg(efx, hw, efx->net_dev, "Removed vf %s rx filter %d\n",
358 vf->pci_name, vf->rx_filter_id);
359 vf->rx_filter_id = -1;
360 }
361
362 if (!vf->rx_filtering || is_zero_ether_addr(vf->addr.mac_addr))
363 return;
364
365 vlan = ntohs(vf->addr.tci) & VLAN_VID_MASK;
366 efx_filter_init_rx(&filter, EFX_FILTER_PRI_REQUIRED,
367 vf->rx_filter_flags,
368 abs_index(vf, vf->rx_filter_qid));
369 rc = efx_filter_set_eth_local(&filter,
370 vlan ? vlan : EFX_FILTER_VID_UNSPEC,
371 vf->addr.mac_addr);
372 BUG_ON(rc);
373
374 rc = efx_filter_insert_filter(efx, &filter, true);
375 if (rc < 0) {
376 netif_warn(efx, hw, efx->net_dev,
377 "Unable to insert rx filter for vf %s\n",
378 vf->pci_name);
379 } else {
380 netif_dbg(efx, hw, efx->net_dev, "Inserted vf %s rx filter %d\n",
381 vf->pci_name, rc);
382 vf->rx_filter_id = rc;
383 }
384}
385
386static void __efx_siena_sriov_update_vf_addr(struct siena_vf *vf)
387{
388 struct efx_nic *efx = vf->efx;
389 struct siena_nic_data *nic_data = efx->nic_data;
390
391 efx_siena_sriov_reset_tx_filter(vf);
392 efx_siena_sriov_reset_rx_filter(vf);
393 queue_work(vfdi_workqueue, &nic_data->peer_work);
394}
395
396/* Push the peer list to this VF. The caller must hold status_lock to interlock
397 * with VFDI requests, and they must be serialised against manipulation of
398 * local_page_list, either by acquiring local_lock or by running from
399 * efx_siena_sriov_peer_work()
400 */
401static void __efx_siena_sriov_push_vf_status(struct siena_vf *vf)
402{
403 struct efx_nic *efx = vf->efx;
404 struct siena_nic_data *nic_data = efx->nic_data;
405 struct vfdi_status *status = nic_data->vfdi_status.addr;
406 struct efx_memcpy_req copy[4];
407 struct efx_endpoint_page *epp;
408 unsigned int pos, count;
409 unsigned data_offset;
410 efx_qword_t event;
411
412 WARN_ON(!mutex_is_locked(&vf->status_lock));
413 WARN_ON(!vf->status_addr);
414
415 status->local = vf->addr;
416 status->generation_end = ++status->generation_start;
417
418 memset(copy, '\0', sizeof(copy));
419 /* Write generation_start */
420 copy[0].from_buf = &status->generation_start;
421 copy[0].to_rid = vf->pci_rid;
422 copy[0].to_addr = vf->status_addr + offsetof(struct vfdi_status,
423 generation_start);
424 copy[0].length = sizeof(status->generation_start);
425 /* DMA the rest of the structure (excluding the generations). This
426 * assumes that the non-generation portion of vfdi_status is in
427 * one chunk starting at the version member.
428 */
429 data_offset = offsetof(struct vfdi_status, version);
430 copy[1].from_rid = efx->pci_dev->devfn;
431 copy[1].from_addr = nic_data->vfdi_status.dma_addr + data_offset;
432 copy[1].to_rid = vf->pci_rid;
433 copy[1].to_addr = vf->status_addr + data_offset;
434 copy[1].length = status->length - data_offset;
435
436 /* Copy the peer pages */
437 pos = 2;
438 count = 0;
439 list_for_each_entry(epp, &nic_data->local_page_list, link) {
440 if (count == vf->peer_page_count) {
441 /* The VF driver will know they need to provide more
442 * pages because peer_addr_count is too large.
443 */
444 break;
445 }
446 copy[pos].from_buf = NULL;
447 copy[pos].from_rid = efx->pci_dev->devfn;
448 copy[pos].from_addr = epp->addr;
449 copy[pos].to_rid = vf->pci_rid;
450 copy[pos].to_addr = vf->peer_page_addrs[count];
451 copy[pos].length = EFX_PAGE_SIZE;
452
453 if (++pos == ARRAY_SIZE(copy)) {
454 efx_siena_sriov_memcpy(efx, copy, ARRAY_SIZE(copy));
455 pos = 0;
456 }
457 ++count;
458 }
459
460 /* Write generation_end */
461 copy[pos].from_buf = &status->generation_end;
462 copy[pos].to_rid = vf->pci_rid;
463 copy[pos].to_addr = vf->status_addr + offsetof(struct vfdi_status,
464 generation_end);
465 copy[pos].length = sizeof(status->generation_end);
466 efx_siena_sriov_memcpy(efx, copy, pos + 1);
467
468 /* Notify the guest */
469 EFX_POPULATE_QWORD_3(event,
470 FSF_AZ_EV_CODE, FSE_CZ_EV_CODE_USER_EV,
471 VFDI_EV_SEQ, (vf->msg_seqno & 0xff),
472 VFDI_EV_TYPE, VFDI_EV_TYPE_STATUS);
473 ++vf->msg_seqno;
474 efx_farch_generate_event(efx,
475 EFX_VI_BASE + vf->index * efx_vf_size(efx),
476 &event);
477}
478
479static void efx_siena_sriov_bufs(struct efx_nic *efx, unsigned offset,
480 u64 *addr, unsigned count)
481{
482 efx_qword_t buf;
483 unsigned pos;
484
485 for (pos = 0; pos < count; ++pos) {
486 EFX_POPULATE_QWORD_3(buf,
487 FRF_AZ_BUF_ADR_REGION, 0,
488 FRF_AZ_BUF_ADR_FBUF,
489 addr ? addr[pos] >> 12 : 0,
490 FRF_AZ_BUF_OWNER_ID_FBUF, 0);
491 efx_sram_writeq(efx, efx->membase + FR_BZ_BUF_FULL_TBL,
492 &buf, offset + pos);
493 }
494}
495
496static bool bad_vf_index(struct efx_nic *efx, unsigned index)
497{
498 return index >= efx_vf_size(efx);
499}
500
501static bool bad_buf_count(unsigned buf_count, unsigned max_entry_count)
502{
503 unsigned max_buf_count = max_entry_count *
504 sizeof(efx_qword_t) / EFX_BUF_SIZE;
505
506 return ((buf_count & (buf_count - 1)) || buf_count > max_buf_count);
507}
508
509/* Check that VI specified by per-port index belongs to a VF.
510 * Optionally set VF index and VI index within the VF.
511 */
512static bool map_vi_index(struct efx_nic *efx, unsigned abs_index,
513 struct siena_vf **vf_out, unsigned *rel_index_out)
514{
515 struct siena_nic_data *nic_data = efx->nic_data;
516 unsigned vf_i;
517
518 if (abs_index < EFX_VI_BASE)
519 return true;
520 vf_i = (abs_index - EFX_VI_BASE) / efx_vf_size(efx);
521 if (vf_i >= efx->vf_init_count)
522 return true;
523
524 if (vf_out)
525 *vf_out = nic_data->vf + vf_i;
526 if (rel_index_out)
527 *rel_index_out = abs_index % efx_vf_size(efx);
528 return false;
529}
530
531static int efx_vfdi_init_evq(struct siena_vf *vf)
532{
533 struct efx_nic *efx = vf->efx;
534 struct vfdi_req *req = vf->buf.addr;
535 unsigned vf_evq = req->u.init_evq.index;
536 unsigned buf_count = req->u.init_evq.buf_count;
537 unsigned abs_evq = abs_index(vf, vf_evq);
538 unsigned buftbl = EFX_BUFTBL_EVQ_BASE(vf, vf_evq);
539 efx_oword_t reg;
540
541 if (bad_vf_index(efx, vf_evq) ||
542 bad_buf_count(buf_count, EFX_MAX_VF_EVQ_SIZE)) {
543 if (net_ratelimit())
544 netif_err(efx, hw, efx->net_dev,
545 "ERROR: Invalid INIT_EVQ from %s: evq %d bufs %d\n",
546 vf->pci_name, vf_evq, buf_count);
547 return VFDI_RC_EINVAL;
548 }
549
550 efx_siena_sriov_bufs(efx, buftbl, req->u.init_evq.addr, buf_count);
551
552 EFX_POPULATE_OWORD_3(reg,
553 FRF_CZ_TIMER_Q_EN, 1,
554 FRF_CZ_HOST_NOTIFY_MODE, 0,
555 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
556 efx_writeo_table(efx, ®, FR_BZ_TIMER_TBL, abs_evq);
557 EFX_POPULATE_OWORD_3(reg,
558 FRF_AZ_EVQ_EN, 1,
559 FRF_AZ_EVQ_SIZE, __ffs(buf_count),
560 FRF_AZ_EVQ_BUF_BASE_ID, buftbl);
561 efx_writeo_table(efx, ®, FR_BZ_EVQ_PTR_TBL, abs_evq);
562
563 if (vf_evq == 0) {
564 memcpy(vf->evq0_addrs, req->u.init_evq.addr,
565 buf_count * sizeof(u64));
566 vf->evq0_count = buf_count;
567 }
568
569 return VFDI_RC_SUCCESS;
570}
571
572static int efx_vfdi_init_rxq(struct siena_vf *vf)
573{
574 struct efx_nic *efx = vf->efx;
575 struct vfdi_req *req = vf->buf.addr;
576 unsigned vf_rxq = req->u.init_rxq.index;
577 unsigned vf_evq = req->u.init_rxq.evq;
578 unsigned buf_count = req->u.init_rxq.buf_count;
579 unsigned buftbl = EFX_BUFTBL_RXQ_BASE(vf, vf_rxq);
580 unsigned label;
581 efx_oword_t reg;
582
583 if (bad_vf_index(efx, vf_evq) || bad_vf_index(efx, vf_rxq) ||
584 vf_rxq >= VF_MAX_RX_QUEUES ||
585 bad_buf_count(buf_count, EFX_MAX_DMAQ_SIZE)) {
586 if (net_ratelimit())
587 netif_err(efx, hw, efx->net_dev,
588 "ERROR: Invalid INIT_RXQ from %s: rxq %d evq %d "
589 "buf_count %d\n", vf->pci_name, vf_rxq,
590 vf_evq, buf_count);
591 return VFDI_RC_EINVAL;
592 }
593 if (__test_and_set_bit(req->u.init_rxq.index, vf->rxq_mask))
594 ++vf->rxq_count;
595 efx_siena_sriov_bufs(efx, buftbl, req->u.init_rxq.addr, buf_count);
596
597 label = req->u.init_rxq.label & EFX_FIELD_MASK(FRF_AZ_RX_DESCQ_LABEL);
598 EFX_POPULATE_OWORD_6(reg,
599 FRF_AZ_RX_DESCQ_BUF_BASE_ID, buftbl,
600 FRF_AZ_RX_DESCQ_EVQ_ID, abs_index(vf, vf_evq),
601 FRF_AZ_RX_DESCQ_LABEL, label,
602 FRF_AZ_RX_DESCQ_SIZE, __ffs(buf_count),
603 FRF_AZ_RX_DESCQ_JUMBO,
604 !!(req->u.init_rxq.flags &
605 VFDI_RXQ_FLAG_SCATTER_EN),
606 FRF_AZ_RX_DESCQ_EN, 1);
607 efx_writeo_table(efx, ®, FR_BZ_RX_DESC_PTR_TBL,
608 abs_index(vf, vf_rxq));
609
610 return VFDI_RC_SUCCESS;
611}
612
613static int efx_vfdi_init_txq(struct siena_vf *vf)
614{
615 struct efx_nic *efx = vf->efx;
616 struct vfdi_req *req = vf->buf.addr;
617 unsigned vf_txq = req->u.init_txq.index;
618 unsigned vf_evq = req->u.init_txq.evq;
619 unsigned buf_count = req->u.init_txq.buf_count;
620 unsigned buftbl = EFX_BUFTBL_TXQ_BASE(vf, vf_txq);
621 unsigned label, eth_filt_en;
622 efx_oword_t reg;
623
624 if (bad_vf_index(efx, vf_evq) || bad_vf_index(efx, vf_txq) ||
625 vf_txq >= vf_max_tx_channels ||
626 bad_buf_count(buf_count, EFX_MAX_DMAQ_SIZE)) {
627 if (net_ratelimit())
628 netif_err(efx, hw, efx->net_dev,
629 "ERROR: Invalid INIT_TXQ from %s: txq %d evq %d "
630 "buf_count %d\n", vf->pci_name, vf_txq,
631 vf_evq, buf_count);
632 return VFDI_RC_EINVAL;
633 }
634
635 mutex_lock(&vf->txq_lock);
636 if (__test_and_set_bit(req->u.init_txq.index, vf->txq_mask))
637 ++vf->txq_count;
638 mutex_unlock(&vf->txq_lock);
639 efx_siena_sriov_bufs(efx, buftbl, req->u.init_txq.addr, buf_count);
640
641 eth_filt_en = vf->tx_filter_mode == VF_TX_FILTER_ON;
642
643 label = req->u.init_txq.label & EFX_FIELD_MASK(FRF_AZ_TX_DESCQ_LABEL);
644 EFX_POPULATE_OWORD_8(reg,
645 FRF_CZ_TX_DPT_Q_MASK_WIDTH, min(efx->vi_scale, 1U),
646 FRF_CZ_TX_DPT_ETH_FILT_EN, eth_filt_en,
647 FRF_AZ_TX_DESCQ_EN, 1,
648 FRF_AZ_TX_DESCQ_BUF_BASE_ID, buftbl,
649 FRF_AZ_TX_DESCQ_EVQ_ID, abs_index(vf, vf_evq),
650 FRF_AZ_TX_DESCQ_LABEL, label,
651 FRF_AZ_TX_DESCQ_SIZE, __ffs(buf_count),
652 FRF_BZ_TX_NON_IP_DROP_DIS, 1);
653 efx_writeo_table(efx, ®, FR_BZ_TX_DESC_PTR_TBL,
654 abs_index(vf, vf_txq));
655
656 return VFDI_RC_SUCCESS;
657}
658
659/* Returns true when efx_vfdi_fini_all_queues should wake */
660static bool efx_vfdi_flush_wake(struct siena_vf *vf)
661{
662 /* Ensure that all updates are visible to efx_vfdi_fini_all_queues() */
663 smp_mb();
664
665 return (!vf->txq_count && !vf->rxq_count) ||
666 atomic_read(&vf->rxq_retry_count);
667}
668
669static void efx_vfdi_flush_clear(struct siena_vf *vf)
670{
671 memset(vf->txq_mask, 0, sizeof(vf->txq_mask));
672 vf->txq_count = 0;
673 memset(vf->rxq_mask, 0, sizeof(vf->rxq_mask));
674 vf->rxq_count = 0;
675 memset(vf->rxq_retry_mask, 0, sizeof(vf->rxq_retry_mask));
676 atomic_set(&vf->rxq_retry_count, 0);
677}
678
679static int efx_vfdi_fini_all_queues(struct siena_vf *vf)
680{
681 struct efx_nic *efx = vf->efx;
682 efx_oword_t reg;
683 unsigned count = efx_vf_size(efx);
684 unsigned vf_offset = EFX_VI_BASE + vf->index * efx_vf_size(efx);
685 unsigned timeout = HZ;
686 unsigned index, rxqs_count;
687 MCDI_DECLARE_BUF(inbuf, MC_CMD_FLUSH_RX_QUEUES_IN_LENMAX);
688 int rc;
689
690 BUILD_BUG_ON(VF_MAX_RX_QUEUES >
691 MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
692
693 rtnl_lock();
694 siena_prepare_flush(efx);
695 rtnl_unlock();
696
697 /* Flush all the initialized queues */
698 rxqs_count = 0;
699 for (index = 0; index < count; ++index) {
700 if (test_bit(index, vf->txq_mask)) {
701 EFX_POPULATE_OWORD_2(reg,
702 FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
703 FRF_AZ_TX_FLUSH_DESCQ,
704 vf_offset + index);
705 efx_writeo(efx, ®, FR_AZ_TX_FLUSH_DESCQ);
706 }
707 if (test_bit(index, vf->rxq_mask)) {
708 MCDI_SET_ARRAY_DWORD(
709 inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
710 rxqs_count, vf_offset + index);
711 rxqs_count++;
712 }
713 }
714
715 atomic_set(&vf->rxq_retry_count, 0);
716 while (timeout && (vf->rxq_count || vf->txq_count)) {
717 rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
718 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(rxqs_count),
719 NULL, 0, NULL);
720 WARN_ON(rc < 0);
721
722 timeout = wait_event_timeout(vf->flush_waitq,
723 efx_vfdi_flush_wake(vf),
724 timeout);
725 rxqs_count = 0;
726 for (index = 0; index < count; ++index) {
727 if (test_and_clear_bit(index, vf->rxq_retry_mask)) {
728 atomic_dec(&vf->rxq_retry_count);
729 MCDI_SET_ARRAY_DWORD(
730 inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
731 rxqs_count, vf_offset + index);
732 rxqs_count++;
733 }
734 }
735 }
736
737 rtnl_lock();
738 siena_finish_flush(efx);
739 rtnl_unlock();
740
741 /* Irrespective of success/failure, fini the queues */
742 EFX_ZERO_OWORD(reg);
743 for (index = 0; index < count; ++index) {
744 efx_writeo_table(efx, ®, FR_BZ_RX_DESC_PTR_TBL,
745 vf_offset + index);
746 efx_writeo_table(efx, ®, FR_BZ_TX_DESC_PTR_TBL,
747 vf_offset + index);
748 efx_writeo_table(efx, ®, FR_BZ_EVQ_PTR_TBL,
749 vf_offset + index);
750 efx_writeo_table(efx, ®, FR_BZ_TIMER_TBL,
751 vf_offset + index);
752 }
753 efx_siena_sriov_bufs(efx, vf->buftbl_base, NULL,
754 EFX_VF_BUFTBL_PER_VI * efx_vf_size(efx));
755 efx_vfdi_flush_clear(vf);
756
757 vf->evq0_count = 0;
758
759 return timeout ? 0 : VFDI_RC_ETIMEDOUT;
760}
761
762static int efx_vfdi_insert_filter(struct siena_vf *vf)
763{
764 struct efx_nic *efx = vf->efx;
765 struct siena_nic_data *nic_data = efx->nic_data;
766 struct vfdi_req *req = vf->buf.addr;
767 unsigned vf_rxq = req->u.mac_filter.rxq;
768 unsigned flags;
769
770 if (bad_vf_index(efx, vf_rxq) || vf->rx_filtering) {
771 if (net_ratelimit())
772 netif_err(efx, hw, efx->net_dev,
773 "ERROR: Invalid INSERT_FILTER from %s: rxq %d "
774 "flags 0x%x\n", vf->pci_name, vf_rxq,
775 req->u.mac_filter.flags);
776 return VFDI_RC_EINVAL;
777 }
778
779 flags = 0;
780 if (req->u.mac_filter.flags & VFDI_MAC_FILTER_FLAG_RSS)
781 flags |= EFX_FILTER_FLAG_RX_RSS;
782 if (req->u.mac_filter.flags & VFDI_MAC_FILTER_FLAG_SCATTER)
783 flags |= EFX_FILTER_FLAG_RX_SCATTER;
784 vf->rx_filter_flags = flags;
785 vf->rx_filter_qid = vf_rxq;
786 vf->rx_filtering = true;
787
788 efx_siena_sriov_reset_rx_filter(vf);
789 queue_work(vfdi_workqueue, &nic_data->peer_work);
790
791 return VFDI_RC_SUCCESS;
792}
793
794static int efx_vfdi_remove_all_filters(struct siena_vf *vf)
795{
796 struct efx_nic *efx = vf->efx;
797 struct siena_nic_data *nic_data = efx->nic_data;
798
799 vf->rx_filtering = false;
800 efx_siena_sriov_reset_rx_filter(vf);
801 queue_work(vfdi_workqueue, &nic_data->peer_work);
802
803 return VFDI_RC_SUCCESS;
804}
805
806static int efx_vfdi_set_status_page(struct siena_vf *vf)
807{
808 struct efx_nic *efx = vf->efx;
809 struct siena_nic_data *nic_data = efx->nic_data;
810 struct vfdi_req *req = vf->buf.addr;
811 u64 page_count = req->u.set_status_page.peer_page_count;
812 u64 max_page_count =
813 (EFX_PAGE_SIZE -
814 offsetof(struct vfdi_req, u.set_status_page.peer_page_addr[0]))
815 / sizeof(req->u.set_status_page.peer_page_addr[0]);
816
817 if (!req->u.set_status_page.dma_addr || page_count > max_page_count) {
818 if (net_ratelimit())
819 netif_err(efx, hw, efx->net_dev,
820 "ERROR: Invalid SET_STATUS_PAGE from %s\n",
821 vf->pci_name);
822 return VFDI_RC_EINVAL;
823 }
824
825 mutex_lock(&nic_data->local_lock);
826 mutex_lock(&vf->status_lock);
827 vf->status_addr = req->u.set_status_page.dma_addr;
828
829 kfree(vf->peer_page_addrs);
830 vf->peer_page_addrs = NULL;
831 vf->peer_page_count = 0;
832
833 if (page_count) {
834 vf->peer_page_addrs = kcalloc(page_count, sizeof(u64),
835 GFP_KERNEL);
836 if (vf->peer_page_addrs) {
837 memcpy(vf->peer_page_addrs,
838 req->u.set_status_page.peer_page_addr,
839 page_count * sizeof(u64));
840 vf->peer_page_count = page_count;
841 }
842 }
843
844 __efx_siena_sriov_push_vf_status(vf);
845 mutex_unlock(&vf->status_lock);
846 mutex_unlock(&nic_data->local_lock);
847
848 return VFDI_RC_SUCCESS;
849}
850
851static int efx_vfdi_clear_status_page(struct siena_vf *vf)
852{
853 mutex_lock(&vf->status_lock);
854 vf->status_addr = 0;
855 mutex_unlock(&vf->status_lock);
856
857 return VFDI_RC_SUCCESS;
858}
859
860typedef int (*efx_vfdi_op_t)(struct siena_vf *vf);
861
862static const efx_vfdi_op_t vfdi_ops[VFDI_OP_LIMIT] = {
863 [VFDI_OP_INIT_EVQ] = efx_vfdi_init_evq,
864 [VFDI_OP_INIT_TXQ] = efx_vfdi_init_txq,
865 [VFDI_OP_INIT_RXQ] = efx_vfdi_init_rxq,
866 [VFDI_OP_FINI_ALL_QUEUES] = efx_vfdi_fini_all_queues,
867 [VFDI_OP_INSERT_FILTER] = efx_vfdi_insert_filter,
868 [VFDI_OP_REMOVE_ALL_FILTERS] = efx_vfdi_remove_all_filters,
869 [VFDI_OP_SET_STATUS_PAGE] = efx_vfdi_set_status_page,
870 [VFDI_OP_CLEAR_STATUS_PAGE] = efx_vfdi_clear_status_page,
871};
872
873static void efx_siena_sriov_vfdi(struct work_struct *work)
874{
875 struct siena_vf *vf = container_of(work, struct siena_vf, req);
876 struct efx_nic *efx = vf->efx;
877 struct vfdi_req *req = vf->buf.addr;
878 struct efx_memcpy_req copy[2];
879 int rc;
880
881 /* Copy this page into the local address space */
882 memset(copy, '\0', sizeof(copy));
883 copy[0].from_rid = vf->pci_rid;
884 copy[0].from_addr = vf->req_addr;
885 copy[0].to_rid = efx->pci_dev->devfn;
886 copy[0].to_addr = vf->buf.dma_addr;
887 copy[0].length = EFX_PAGE_SIZE;
888 rc = efx_siena_sriov_memcpy(efx, copy, 1);
889 if (rc) {
890 /* If we can't get the request, we can't reply to the caller */
891 if (net_ratelimit())
892 netif_err(efx, hw, efx->net_dev,
893 "ERROR: Unable to fetch VFDI request from %s rc %d\n",
894 vf->pci_name, -rc);
895 vf->busy = false;
896 return;
897 }
898
899 if (req->op < VFDI_OP_LIMIT && vfdi_ops[req->op] != NULL) {
900 rc = vfdi_ops[req->op](vf);
901 if (rc == 0) {
902 netif_dbg(efx, hw, efx->net_dev,
903 "vfdi request %d from %s ok\n",
904 req->op, vf->pci_name);
905 }
906 } else {
907 netif_dbg(efx, hw, efx->net_dev,
908 "ERROR: Unrecognised request %d from VF %s addr "
909 "%llx\n", req->op, vf->pci_name,
910 (unsigned long long)vf->req_addr);
911 rc = VFDI_RC_EOPNOTSUPP;
912 }
913
914 /* Allow subsequent VF requests */
915 vf->busy = false;
916 smp_wmb();
917
918 /* Respond to the request */
919 req->rc = rc;
920 req->op = VFDI_OP_RESPONSE;
921
922 memset(copy, '\0', sizeof(copy));
923 copy[0].from_buf = &req->rc;
924 copy[0].to_rid = vf->pci_rid;
925 copy[0].to_addr = vf->req_addr + offsetof(struct vfdi_req, rc);
926 copy[0].length = sizeof(req->rc);
927 copy[1].from_buf = &req->op;
928 copy[1].to_rid = vf->pci_rid;
929 copy[1].to_addr = vf->req_addr + offsetof(struct vfdi_req, op);
930 copy[1].length = sizeof(req->op);
931
932 (void)efx_siena_sriov_memcpy(efx, copy, ARRAY_SIZE(copy));
933}
934
935
936
937/* After a reset the event queues inside the guests no longer exist. Fill the
938 * event ring in guest memory with VFDI reset events, then (re-initialise) the
939 * event queue to raise an interrupt. The guest driver will then recover.
940 */
941
942static void efx_siena_sriov_reset_vf(struct siena_vf *vf,
943 struct efx_buffer *buffer)
944{
945 struct efx_nic *efx = vf->efx;
946 struct efx_memcpy_req copy_req[4];
947 efx_qword_t event;
948 unsigned int pos, count, k, buftbl, abs_evq;
949 efx_oword_t reg;
950 efx_dword_t ptr;
951 int rc;
952
953 BUG_ON(buffer->len != EFX_PAGE_SIZE);
954
955 if (!vf->evq0_count)
956 return;
957 BUG_ON(vf->evq0_count & (vf->evq0_count - 1));
958
959 mutex_lock(&vf->status_lock);
960 EFX_POPULATE_QWORD_3(event,
961 FSF_AZ_EV_CODE, FSE_CZ_EV_CODE_USER_EV,
962 VFDI_EV_SEQ, vf->msg_seqno,
963 VFDI_EV_TYPE, VFDI_EV_TYPE_RESET);
964 vf->msg_seqno++;
965 for (pos = 0; pos < EFX_PAGE_SIZE; pos += sizeof(event))
966 memcpy(buffer->addr + pos, &event, sizeof(event));
967
968 for (pos = 0; pos < vf->evq0_count; pos += count) {
969 count = min_t(unsigned, vf->evq0_count - pos,
970 ARRAY_SIZE(copy_req));
971 for (k = 0; k < count; k++) {
972 copy_req[k].from_buf = NULL;
973 copy_req[k].from_rid = efx->pci_dev->devfn;
974 copy_req[k].from_addr = buffer->dma_addr;
975 copy_req[k].to_rid = vf->pci_rid;
976 copy_req[k].to_addr = vf->evq0_addrs[pos + k];
977 copy_req[k].length = EFX_PAGE_SIZE;
978 }
979 rc = efx_siena_sriov_memcpy(efx, copy_req, count);
980 if (rc) {
981 if (net_ratelimit())
982 netif_err(efx, hw, efx->net_dev,
983 "ERROR: Unable to notify %s of reset"
984 ": %d\n", vf->pci_name, -rc);
985 break;
986 }
987 }
988
989 /* Reinitialise, arm and trigger evq0 */
990 abs_evq = abs_index(vf, 0);
991 buftbl = EFX_BUFTBL_EVQ_BASE(vf, 0);
992 efx_siena_sriov_bufs(efx, buftbl, vf->evq0_addrs, vf->evq0_count);
993
994 EFX_POPULATE_OWORD_3(reg,
995 FRF_CZ_TIMER_Q_EN, 1,
996 FRF_CZ_HOST_NOTIFY_MODE, 0,
997 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
998 efx_writeo_table(efx, ®, FR_BZ_TIMER_TBL, abs_evq);
999 EFX_POPULATE_OWORD_3(reg,
1000 FRF_AZ_EVQ_EN, 1,
1001 FRF_AZ_EVQ_SIZE, __ffs(vf->evq0_count),
1002 FRF_AZ_EVQ_BUF_BASE_ID, buftbl);
1003 efx_writeo_table(efx, ®, FR_BZ_EVQ_PTR_TBL, abs_evq);
1004 EFX_POPULATE_DWORD_1(ptr, FRF_AZ_EVQ_RPTR, 0);
1005 efx_writed(efx, &ptr, FR_BZ_EVQ_RPTR + FR_BZ_EVQ_RPTR_STEP * abs_evq);
1006
1007 mutex_unlock(&vf->status_lock);
1008}
1009
1010static void efx_siena_sriov_reset_vf_work(struct work_struct *work)
1011{
1012 struct siena_vf *vf = container_of(work, struct siena_vf, req);
1013 struct efx_nic *efx = vf->efx;
1014 struct efx_buffer buf;
1015
1016 if (!efx_nic_alloc_buffer(efx, &buf, EFX_PAGE_SIZE, GFP_NOIO)) {
1017 efx_siena_sriov_reset_vf(vf, &buf);
1018 efx_nic_free_buffer(efx, &buf);
1019 }
1020}
1021
1022static void efx_siena_sriov_handle_no_channel(struct efx_nic *efx)
1023{
1024 netif_err(efx, drv, efx->net_dev,
1025 "ERROR: IOV requires MSI-X and 1 additional interrupt"
1026 "vector. IOV disabled\n");
1027 efx->vf_count = 0;
1028}
1029
1030static int efx_siena_sriov_probe_channel(struct efx_channel *channel)
1031{
1032 struct siena_nic_data *nic_data = channel->efx->nic_data;
1033 nic_data->vfdi_channel = channel;
1034
1035 return 0;
1036}
1037
1038static void
1039efx_siena_sriov_get_channel_name(struct efx_channel *channel,
1040 char *buf, size_t len)
1041{
1042 snprintf(buf, len, "%s-iov", channel->efx->name);
1043}
1044
1045static const struct efx_channel_type efx_siena_sriov_channel_type = {
1046 .handle_no_channel = efx_siena_sriov_handle_no_channel,
1047 .pre_probe = efx_siena_sriov_probe_channel,
1048 .post_remove = efx_channel_dummy_op_void,
1049 .get_name = efx_siena_sriov_get_channel_name,
1050 /* no copy operation; channel must not be reallocated */
1051 .keep_eventq = true,
1052};
1053
1054void efx_siena_sriov_probe(struct efx_nic *efx)
1055{
1056 unsigned count;
1057
1058 if (!max_vfs)
1059 return;
1060
1061 if (efx_siena_sriov_cmd(efx, false, &efx->vi_scale, &count)) {
1062 netif_info(efx, probe, efx->net_dev, "no SR-IOV VFs probed\n");
1063 return;
1064 }
1065 if (count > 0 && count > max_vfs)
1066 count = max_vfs;
1067
1068 /* efx_nic_dimension_resources() will reduce vf_count as appopriate */
1069 efx->vf_count = count;
1070
1071 efx->extra_channel_type[EFX_EXTRA_CHANNEL_IOV] = &efx_siena_sriov_channel_type;
1072}
1073
1074/* Copy the list of individual addresses into the vfdi_status.peers
1075 * array and auxiliary pages, protected by %local_lock. Drop that lock
1076 * and then broadcast the address list to every VF.
1077 */
1078static void efx_siena_sriov_peer_work(struct work_struct *data)
1079{
1080 struct siena_nic_data *nic_data = container_of(data,
1081 struct siena_nic_data,
1082 peer_work);
1083 struct efx_nic *efx = nic_data->efx;
1084 struct vfdi_status *vfdi_status = nic_data->vfdi_status.addr;
1085 struct siena_vf *vf;
1086 struct efx_local_addr *local_addr;
1087 struct vfdi_endpoint *peer;
1088 struct efx_endpoint_page *epp;
1089 struct list_head pages;
1090 unsigned int peer_space;
1091 unsigned int peer_count;
1092 unsigned int pos;
1093
1094 mutex_lock(&nic_data->local_lock);
1095
1096 /* Move the existing peer pages off %local_page_list */
1097 INIT_LIST_HEAD(&pages);
1098 list_splice_tail_init(&nic_data->local_page_list, &pages);
1099
1100 /* Populate the VF addresses starting from entry 1 (entry 0 is
1101 * the PF address)
1102 */
1103 peer = vfdi_status->peers + 1;
1104 peer_space = ARRAY_SIZE(vfdi_status->peers) - 1;
1105 peer_count = 1;
1106 for (pos = 0; pos < efx->vf_count; ++pos) {
1107 vf = nic_data->vf + pos;
1108
1109 mutex_lock(&vf->status_lock);
1110 if (vf->rx_filtering && !is_zero_ether_addr(vf->addr.mac_addr)) {
1111 *peer++ = vf->addr;
1112 ++peer_count;
1113 --peer_space;
1114 BUG_ON(peer_space == 0);
1115 }
1116 mutex_unlock(&vf->status_lock);
1117 }
1118
1119 /* Fill the remaining addresses */
1120 list_for_each_entry(local_addr, &nic_data->local_addr_list, link) {
1121 ether_addr_copy(peer->mac_addr, local_addr->addr);
1122 peer->tci = 0;
1123 ++peer;
1124 ++peer_count;
1125 if (--peer_space == 0) {
1126 if (list_empty(&pages)) {
1127 epp = kmalloc(sizeof(*epp), GFP_KERNEL);
1128 if (!epp)
1129 break;
1130 epp->ptr = dma_alloc_coherent(
1131 &efx->pci_dev->dev, EFX_PAGE_SIZE,
1132 &epp->addr, GFP_KERNEL);
1133 if (!epp->ptr) {
1134 kfree(epp);
1135 break;
1136 }
1137 } else {
1138 epp = list_first_entry(
1139 &pages, struct efx_endpoint_page, link);
1140 list_del(&epp->link);
1141 }
1142
1143 list_add_tail(&epp->link, &nic_data->local_page_list);
1144 peer = (struct vfdi_endpoint *)epp->ptr;
1145 peer_space = EFX_PAGE_SIZE / sizeof(struct vfdi_endpoint);
1146 }
1147 }
1148 vfdi_status->peer_count = peer_count;
1149 mutex_unlock(&nic_data->local_lock);
1150
1151 /* Free any now unused endpoint pages */
1152 while (!list_empty(&pages)) {
1153 epp = list_first_entry(
1154 &pages, struct efx_endpoint_page, link);
1155 list_del(&epp->link);
1156 dma_free_coherent(&efx->pci_dev->dev, EFX_PAGE_SIZE,
1157 epp->ptr, epp->addr);
1158 kfree(epp);
1159 }
1160
1161 /* Finally, push the pages */
1162 for (pos = 0; pos < efx->vf_count; ++pos) {
1163 vf = nic_data->vf + pos;
1164
1165 mutex_lock(&vf->status_lock);
1166 if (vf->status_addr)
1167 __efx_siena_sriov_push_vf_status(vf);
1168 mutex_unlock(&vf->status_lock);
1169 }
1170}
1171
1172static void efx_siena_sriov_free_local(struct efx_nic *efx)
1173{
1174 struct siena_nic_data *nic_data = efx->nic_data;
1175 struct efx_local_addr *local_addr;
1176 struct efx_endpoint_page *epp;
1177
1178 while (!list_empty(&nic_data->local_addr_list)) {
1179 local_addr = list_first_entry(&nic_data->local_addr_list,
1180 struct efx_local_addr, link);
1181 list_del(&local_addr->link);
1182 kfree(local_addr);
1183 }
1184
1185 while (!list_empty(&nic_data->local_page_list)) {
1186 epp = list_first_entry(&nic_data->local_page_list,
1187 struct efx_endpoint_page, link);
1188 list_del(&epp->link);
1189 dma_free_coherent(&efx->pci_dev->dev, EFX_PAGE_SIZE,
1190 epp->ptr, epp->addr);
1191 kfree(epp);
1192 }
1193}
1194
1195static int efx_siena_sriov_vf_alloc(struct efx_nic *efx)
1196{
1197 unsigned index;
1198 struct siena_vf *vf;
1199 struct siena_nic_data *nic_data = efx->nic_data;
1200
1201 nic_data->vf = kcalloc(efx->vf_count, sizeof(*nic_data->vf),
1202 GFP_KERNEL);
1203 if (!nic_data->vf)
1204 return -ENOMEM;
1205
1206 for (index = 0; index < efx->vf_count; ++index) {
1207 vf = nic_data->vf + index;
1208
1209 vf->efx = efx;
1210 vf->index = index;
1211 vf->rx_filter_id = -1;
1212 vf->tx_filter_mode = VF_TX_FILTER_AUTO;
1213 vf->tx_filter_id = -1;
1214 INIT_WORK(&vf->req, efx_siena_sriov_vfdi);
1215 INIT_WORK(&vf->reset_work, efx_siena_sriov_reset_vf_work);
1216 init_waitqueue_head(&vf->flush_waitq);
1217 mutex_init(&vf->status_lock);
1218 mutex_init(&vf->txq_lock);
1219 }
1220
1221 return 0;
1222}
1223
1224static void efx_siena_sriov_vfs_fini(struct efx_nic *efx)
1225{
1226 struct siena_nic_data *nic_data = efx->nic_data;
1227 struct siena_vf *vf;
1228 unsigned int pos;
1229
1230 for (pos = 0; pos < efx->vf_count; ++pos) {
1231 vf = nic_data->vf + pos;
1232
1233 efx_nic_free_buffer(efx, &vf->buf);
1234 kfree(vf->peer_page_addrs);
1235 vf->peer_page_addrs = NULL;
1236 vf->peer_page_count = 0;
1237
1238 vf->evq0_count = 0;
1239 }
1240}
1241
1242static int efx_siena_sriov_vfs_init(struct efx_nic *efx)
1243{
1244 struct pci_dev *pci_dev = efx->pci_dev;
1245 struct siena_nic_data *nic_data = efx->nic_data;
1246 unsigned index, devfn, sriov, buftbl_base;
1247 u16 offset, stride;
1248 struct siena_vf *vf;
1249 int rc;
1250
1251 sriov = pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV);
1252 if (!sriov)
1253 return -ENOENT;
1254
1255 pci_read_config_word(pci_dev, sriov + PCI_SRIOV_VF_OFFSET, &offset);
1256 pci_read_config_word(pci_dev, sriov + PCI_SRIOV_VF_STRIDE, &stride);
1257
1258 buftbl_base = nic_data->vf_buftbl_base;
1259 devfn = pci_dev->devfn + offset;
1260 for (index = 0; index < efx->vf_count; ++index) {
1261 vf = nic_data->vf + index;
1262
1263 /* Reserve buffer entries */
1264 vf->buftbl_base = buftbl_base;
1265 buftbl_base += EFX_VF_BUFTBL_PER_VI * efx_vf_size(efx);
1266
1267 vf->pci_rid = devfn;
1268 snprintf(vf->pci_name, sizeof(vf->pci_name),
1269 "%04x:%02x:%02x.%d",
1270 pci_domain_nr(pci_dev->bus), pci_dev->bus->number,
1271 PCI_SLOT(devfn), PCI_FUNC(devfn));
1272
1273 rc = efx_nic_alloc_buffer(efx, &vf->buf, EFX_PAGE_SIZE,
1274 GFP_KERNEL);
1275 if (rc)
1276 goto fail;
1277
1278 devfn += stride;
1279 }
1280
1281 return 0;
1282
1283fail:
1284 efx_siena_sriov_vfs_fini(efx);
1285 return rc;
1286}
1287
1288int efx_siena_sriov_init(struct efx_nic *efx)
1289{
1290 struct net_device *net_dev = efx->net_dev;
1291 struct siena_nic_data *nic_data = efx->nic_data;
1292 struct vfdi_status *vfdi_status;
1293 int rc;
1294
1295 /* Ensure there's room for vf_channel */
1296 BUILD_BUG_ON(EFX_MAX_CHANNELS + 1 >= EFX_VI_BASE);
1297 /* Ensure that VI_BASE is aligned on VI_SCALE */
1298 BUILD_BUG_ON(EFX_VI_BASE & ((1 << EFX_VI_SCALE_MAX) - 1));
1299
1300 if (efx->vf_count == 0)
1301 return 0;
1302
1303 rc = efx_siena_sriov_cmd(efx, true, NULL, NULL);
1304 if (rc)
1305 goto fail_cmd;
1306
1307 rc = efx_nic_alloc_buffer(efx, &nic_data->vfdi_status,
1308 sizeof(*vfdi_status), GFP_KERNEL);
1309 if (rc)
1310 goto fail_status;
1311 vfdi_status = nic_data->vfdi_status.addr;
1312 memset(vfdi_status, 0, sizeof(*vfdi_status));
1313 vfdi_status->version = 1;
1314 vfdi_status->length = sizeof(*vfdi_status);
1315 vfdi_status->max_tx_channels = vf_max_tx_channels;
1316 vfdi_status->vi_scale = efx->vi_scale;
1317 vfdi_status->rss_rxq_count = efx->rss_spread;
1318 vfdi_status->peer_count = 1 + efx->vf_count;
1319 vfdi_status->timer_quantum_ns = efx->timer_quantum_ns;
1320
1321 rc = efx_siena_sriov_vf_alloc(efx);
1322 if (rc)
1323 goto fail_alloc;
1324
1325 mutex_init(&nic_data->local_lock);
1326 INIT_WORK(&nic_data->peer_work, efx_siena_sriov_peer_work);
1327 INIT_LIST_HEAD(&nic_data->local_addr_list);
1328 INIT_LIST_HEAD(&nic_data->local_page_list);
1329
1330 rc = efx_siena_sriov_vfs_init(efx);
1331 if (rc)
1332 goto fail_vfs;
1333
1334 rtnl_lock();
1335 ether_addr_copy(vfdi_status->peers[0].mac_addr, net_dev->dev_addr);
1336 efx->vf_init_count = efx->vf_count;
1337 rtnl_unlock();
1338
1339 efx_siena_sriov_usrev(efx, true);
1340
1341 /* At this point we must be ready to accept VFDI requests */
1342
1343 rc = pci_enable_sriov(efx->pci_dev, efx->vf_count);
1344 if (rc)
1345 goto fail_pci;
1346
1347 netif_info(efx, probe, net_dev,
1348 "enabled SR-IOV for %d VFs, %d VI per VF\n",
1349 efx->vf_count, efx_vf_size(efx));
1350 return 0;
1351
1352fail_pci:
1353 efx_siena_sriov_usrev(efx, false);
1354 rtnl_lock();
1355 efx->vf_init_count = 0;
1356 rtnl_unlock();
1357 efx_siena_sriov_vfs_fini(efx);
1358fail_vfs:
1359 cancel_work_sync(&nic_data->peer_work);
1360 efx_siena_sriov_free_local(efx);
1361 kfree(nic_data->vf);
1362fail_alloc:
1363 efx_nic_free_buffer(efx, &nic_data->vfdi_status);
1364fail_status:
1365 efx_siena_sriov_cmd(efx, false, NULL, NULL);
1366fail_cmd:
1367 return rc;
1368}
1369
1370void efx_siena_sriov_fini(struct efx_nic *efx)
1371{
1372 struct siena_vf *vf;
1373 unsigned int pos;
1374 struct siena_nic_data *nic_data = efx->nic_data;
1375
1376 if (efx->vf_init_count == 0)
1377 return;
1378
1379 /* Disable all interfaces to reconfiguration */
1380 BUG_ON(nic_data->vfdi_channel->enabled);
1381 efx_siena_sriov_usrev(efx, false);
1382 rtnl_lock();
1383 efx->vf_init_count = 0;
1384 rtnl_unlock();
1385
1386 /* Flush all reconfiguration work */
1387 for (pos = 0; pos < efx->vf_count; ++pos) {
1388 vf = nic_data->vf + pos;
1389 cancel_work_sync(&vf->req);
1390 cancel_work_sync(&vf->reset_work);
1391 }
1392 cancel_work_sync(&nic_data->peer_work);
1393
1394 pci_disable_sriov(efx->pci_dev);
1395
1396 /* Tear down back-end state */
1397 efx_siena_sriov_vfs_fini(efx);
1398 efx_siena_sriov_free_local(efx);
1399 kfree(nic_data->vf);
1400 efx_nic_free_buffer(efx, &nic_data->vfdi_status);
1401 efx_siena_sriov_cmd(efx, false, NULL, NULL);
1402}
1403
1404void efx_siena_sriov_event(struct efx_channel *channel, efx_qword_t *event)
1405{
1406 struct efx_nic *efx = channel->efx;
1407 struct siena_vf *vf;
1408 unsigned qid, seq, type, data;
1409
1410 qid = EFX_QWORD_FIELD(*event, FSF_CZ_USER_QID);
1411
1412 /* USR_EV_REG_VALUE is dword0, so access the VFDI_EV fields directly */
1413 BUILD_BUG_ON(FSF_CZ_USER_EV_REG_VALUE_LBN != 0);
1414 seq = EFX_QWORD_FIELD(*event, VFDI_EV_SEQ);
1415 type = EFX_QWORD_FIELD(*event, VFDI_EV_TYPE);
1416 data = EFX_QWORD_FIELD(*event, VFDI_EV_DATA);
1417
1418 netif_vdbg(efx, hw, efx->net_dev,
1419 "USR_EV event from qid %d seq 0x%x type %d data 0x%x\n",
1420 qid, seq, type, data);
1421
1422 if (map_vi_index(efx, qid, &vf, NULL))
1423 return;
1424 if (vf->busy)
1425 goto error;
1426
1427 if (type == VFDI_EV_TYPE_REQ_WORD0) {
1428 /* Resynchronise */
1429 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1430 vf->req_seqno = seq + 1;
1431 vf->req_addr = 0;
1432 } else if (seq != (vf->req_seqno++ & 0xff) || type != vf->req_type)
1433 goto error;
1434
1435 switch (vf->req_type) {
1436 case VFDI_EV_TYPE_REQ_WORD0:
1437 case VFDI_EV_TYPE_REQ_WORD1:
1438 case VFDI_EV_TYPE_REQ_WORD2:
1439 vf->req_addr |= (u64)data << (vf->req_type << 4);
1440 ++vf->req_type;
1441 return;
1442
1443 case VFDI_EV_TYPE_REQ_WORD3:
1444 vf->req_addr |= (u64)data << 48;
1445 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1446 vf->busy = true;
1447 queue_work(vfdi_workqueue, &vf->req);
1448 return;
1449 }
1450
1451error:
1452 if (net_ratelimit())
1453 netif_err(efx, hw, efx->net_dev,
1454 "ERROR: Screaming VFDI request from %s\n",
1455 vf->pci_name);
1456 /* Reset the request and sequence number */
1457 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1458 vf->req_seqno = seq + 1;
1459}
1460
1461void efx_siena_sriov_flr(struct efx_nic *efx, unsigned vf_i)
1462{
1463 struct siena_nic_data *nic_data = efx->nic_data;
1464 struct siena_vf *vf;
1465
1466 if (vf_i > efx->vf_init_count)
1467 return;
1468 vf = nic_data->vf + vf_i;
1469 netif_info(efx, hw, efx->net_dev,
1470 "FLR on VF %s\n", vf->pci_name);
1471
1472 vf->status_addr = 0;
1473 efx_vfdi_remove_all_filters(vf);
1474 efx_vfdi_flush_clear(vf);
1475
1476 vf->evq0_count = 0;
1477}
1478
1479int efx_siena_sriov_mac_address_changed(struct efx_nic *efx)
1480{
1481 struct siena_nic_data *nic_data = efx->nic_data;
1482 struct vfdi_status *vfdi_status = nic_data->vfdi_status.addr;
1483
1484 if (!efx->vf_init_count)
1485 return 0;
1486 ether_addr_copy(vfdi_status->peers[0].mac_addr,
1487 efx->net_dev->dev_addr);
1488 queue_work(vfdi_workqueue, &nic_data->peer_work);
1489
1490 return 0;
1491}
1492
1493void efx_siena_sriov_tx_flush_done(struct efx_nic *efx, efx_qword_t *event)
1494{
1495 struct siena_vf *vf;
1496 unsigned queue, qid;
1497
1498 queue = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
1499 if (map_vi_index(efx, queue, &vf, &qid))
1500 return;
1501 /* Ignore flush completions triggered by an FLR */
1502 if (!test_bit(qid, vf->txq_mask))
1503 return;
1504
1505 __clear_bit(qid, vf->txq_mask);
1506 --vf->txq_count;
1507
1508 if (efx_vfdi_flush_wake(vf))
1509 wake_up(&vf->flush_waitq);
1510}
1511
1512void efx_siena_sriov_rx_flush_done(struct efx_nic *efx, efx_qword_t *event)
1513{
1514 struct siena_vf *vf;
1515 unsigned ev_failed, queue, qid;
1516
1517 queue = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
1518 ev_failed = EFX_QWORD_FIELD(*event,
1519 FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
1520 if (map_vi_index(efx, queue, &vf, &qid))
1521 return;
1522 if (!test_bit(qid, vf->rxq_mask))
1523 return;
1524
1525 if (ev_failed) {
1526 set_bit(qid, vf->rxq_retry_mask);
1527 atomic_inc(&vf->rxq_retry_count);
1528 } else {
1529 __clear_bit(qid, vf->rxq_mask);
1530 --vf->rxq_count;
1531 }
1532 if (efx_vfdi_flush_wake(vf))
1533 wake_up(&vf->flush_waitq);
1534}
1535
1536/* Called from napi. Schedule the reset work item */
1537void efx_siena_sriov_desc_fetch_err(struct efx_nic *efx, unsigned dmaq)
1538{
1539 struct siena_vf *vf;
1540 unsigned int rel;
1541
1542 if (map_vi_index(efx, dmaq, &vf, &rel))
1543 return;
1544
1545 if (net_ratelimit())
1546 netif_err(efx, hw, efx->net_dev,
1547 "VF %d DMA Q %d reports descriptor fetch error.\n",
1548 vf->index, rel);
1549 queue_work(vfdi_workqueue, &vf->reset_work);
1550}
1551
1552/* Reset all VFs */
1553void efx_siena_sriov_reset(struct efx_nic *efx)
1554{
1555 struct siena_nic_data *nic_data = efx->nic_data;
1556 unsigned int vf_i;
1557 struct efx_buffer buf;
1558 struct siena_vf *vf;
1559
1560 ASSERT_RTNL();
1561
1562 if (efx->vf_init_count == 0)
1563 return;
1564
1565 efx_siena_sriov_usrev(efx, true);
1566 (void)efx_siena_sriov_cmd(efx, true, NULL, NULL);
1567
1568 if (efx_nic_alloc_buffer(efx, &buf, EFX_PAGE_SIZE, GFP_NOIO))
1569 return;
1570
1571 for (vf_i = 0; vf_i < efx->vf_init_count; ++vf_i) {
1572 vf = nic_data->vf + vf_i;
1573 efx_siena_sriov_reset_vf(vf, &buf);
1574 }
1575
1576 efx_nic_free_buffer(efx, &buf);
1577}
1578
1579int efx_init_sriov(void)
1580{
1581 /* A single threaded workqueue is sufficient. efx_siena_sriov_vfdi() and
1582 * efx_siena_sriov_peer_work() spend almost all their time sleeping for
1583 * MCDI to complete anyway
1584 */
1585 vfdi_workqueue = create_singlethread_workqueue("sfc_vfdi");
1586 if (!vfdi_workqueue)
1587 return -ENOMEM;
1588 return 0;
1589}
1590
1591void efx_fini_sriov(void)
1592{
1593 destroy_workqueue(vfdi_workqueue);
1594}
1595
1596int efx_siena_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac)
1597{
1598 struct siena_nic_data *nic_data = efx->nic_data;
1599 struct siena_vf *vf;
1600
1601 if (vf_i >= efx->vf_init_count)
1602 return -EINVAL;
1603 vf = nic_data->vf + vf_i;
1604
1605 mutex_lock(&vf->status_lock);
1606 ether_addr_copy(vf->addr.mac_addr, mac);
1607 __efx_siena_sriov_update_vf_addr(vf);
1608 mutex_unlock(&vf->status_lock);
1609
1610 return 0;
1611}
1612
1613int efx_siena_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i,
1614 u16 vlan, u8 qos)
1615{
1616 struct siena_nic_data *nic_data = efx->nic_data;
1617 struct siena_vf *vf;
1618 u16 tci;
1619
1620 if (vf_i >= efx->vf_init_count)
1621 return -EINVAL;
1622 vf = nic_data->vf + vf_i;
1623
1624 mutex_lock(&vf->status_lock);
1625 tci = (vlan & VLAN_VID_MASK) | ((qos & 0x7) << VLAN_PRIO_SHIFT);
1626 vf->addr.tci = htons(tci);
1627 __efx_siena_sriov_update_vf_addr(vf);
1628 mutex_unlock(&vf->status_lock);
1629
1630 return 0;
1631}
1632
1633int efx_siena_sriov_set_vf_spoofchk(struct efx_nic *efx, int vf_i,
1634 bool spoofchk)
1635{
1636 struct siena_nic_data *nic_data = efx->nic_data;
1637 struct siena_vf *vf;
1638 int rc;
1639
1640 if (vf_i >= efx->vf_init_count)
1641 return -EINVAL;
1642 vf = nic_data->vf + vf_i;
1643
1644 mutex_lock(&vf->txq_lock);
1645 if (vf->txq_count == 0) {
1646 vf->tx_filter_mode =
1647 spoofchk ? VF_TX_FILTER_ON : VF_TX_FILTER_OFF;
1648 rc = 0;
1649 } else {
1650 /* This cannot be changed while TX queues are running */
1651 rc = -EBUSY;
1652 }
1653 mutex_unlock(&vf->txq_lock);
1654 return rc;
1655}
1656
1657int efx_siena_sriov_get_vf_config(struct efx_nic *efx, int vf_i,
1658 struct ifla_vf_info *ivi)
1659{
1660 struct siena_nic_data *nic_data = efx->nic_data;
1661 struct siena_vf *vf;
1662 u16 tci;
1663
1664 if (vf_i >= efx->vf_init_count)
1665 return -EINVAL;
1666 vf = nic_data->vf + vf_i;
1667
1668 ivi->vf = vf_i;
1669 ether_addr_copy(ivi->mac, vf->addr.mac_addr);
1670 ivi->max_tx_rate = 0;
1671 ivi->min_tx_rate = 0;
1672 tci = ntohs(vf->addr.tci);
1673 ivi->vlan = tci & VLAN_VID_MASK;
1674 ivi->qos = (tci >> VLAN_PRIO_SHIFT) & 0x7;
1675 ivi->spoofchk = vf->tx_filter_mode == VF_TX_FILTER_ON;
1676
1677 return 0;
1678}
1679
1680bool efx_siena_sriov_wanted(struct efx_nic *efx)
1681{
1682 return efx->vf_count != 0;
1683}
1684
1685int efx_siena_sriov_configure(struct efx_nic *efx, int num_vfs)
1686{
1687 return 0;
1688}