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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / ethernet / sfc / siena_sriov.c
blob83dcfcae3d4b543e669eb69254383423662d57aa
1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2010-2012 Solarflare Communications Inc.
5 */
6 #include <linux/pci.h>
7 #include <linux/module.h>
8 #include "net_driver.h"
9 #include "efx.h"
10 #include "efx_channels.h"
11 #include "nic.h"
12 #include "io.h"
13 #include "mcdi.h"
14 #include "filter.h"
15 #include "mcdi_pcol.h"
16 #include "farch_regs.h"
17 #include "siena_sriov.h"
18 #include "vfdi.h"
19
20 /* Number of longs required to track all the VIs in a VF */
21 #define VI_MASK_LENGTH BITS_TO_LONGS(1 << EFX_VI_SCALE_MAX)
22
23 /* Maximum number of RX queues supported */
24 #define VF_MAX_RX_QUEUES 63
25
26 /**
27 * enum efx_vf_tx_filter_mode - TX MAC filtering behaviour
28 * @VF_TX_FILTER_OFF: Disabled
29 * @VF_TX_FILTER_AUTO: Enabled if MAC address assigned to VF and only
30 * 2 TX queues allowed per VF.
31 * @VF_TX_FILTER_ON: Enabled
32 */
33 enum efx_vf_tx_filter_mode {
34 VF_TX_FILTER_OFF,
35 VF_TX_FILTER_AUTO,
36 VF_TX_FILTER_ON,
37 };
38
39 /**
40 * struct siena_vf - Back-end resource and protocol state for a PCI VF
41 * @efx: The Efx NIC owning this VF
42 * @pci_rid: The PCI requester ID for this VF
43 * @pci_name: The PCI name (formatted address) of this VF
44 * @index: Index of VF within its port and PF.
45 * @req: VFDI incoming request work item. Incoming USR_EV events are received
46 * by the NAPI handler, but must be handled by executing MCDI requests
47 * inside a work item.
48 * @req_addr: VFDI incoming request DMA address (in VF's PCI address space).
49 * @req_type: Expected next incoming (from VF) %VFDI_EV_TYPE member.
50 * @req_seqno: Expected next incoming (from VF) %VFDI_EV_SEQ member.
51 * @msg_seqno: Next %VFDI_EV_SEQ member to reply to VF. Protected by
52 * @status_lock
53 * @busy: VFDI request queued to be processed or being processed. Receiving
54 * a VFDI request when @busy is set is an error condition.
55 * @buf: Incoming VFDI requests are DMA from the VF into this buffer.
56 * @buftbl_base: Buffer table entries for this VF start at this index.
57 * @rx_filtering: Receive filtering has been requested by the VF driver.
58 * @rx_filter_flags: The flags sent in the %VFDI_OP_INSERT_FILTER request.
59 * @rx_filter_qid: VF relative qid for RX filter requested by VF.
60 * @rx_filter_id: Receive MAC filter ID. Only one filter per VF is supported.
61 * @tx_filter_mode: Transmit MAC filtering mode.
62 * @tx_filter_id: Transmit MAC filter ID.
63 * @addr: The MAC address and outer vlan tag of the VF.
64 * @status_addr: VF DMA address of page for &struct vfdi_status updates.
65 * @status_lock: Mutex protecting @msg_seqno, @status_addr, @addr,
66 * @peer_page_addrs and @peer_page_count from simultaneous
67 * updates by the VM and consumption by
68 * efx_siena_sriov_update_vf_addr()
69 * @peer_page_addrs: Pointer to an array of guest pages for local addresses.
70 * @peer_page_count: Number of entries in @peer_page_count.
71 * @evq0_addrs: Array of guest pages backing evq0.
72 * @evq0_count: Number of entries in @evq0_addrs.
73 * @flush_waitq: wait queue used by %VFDI_OP_FINI_ALL_QUEUES handler
74 * to wait for flush completions.
75 * @txq_lock: Mutex for TX queue allocation.
76 * @txq_mask: Mask of initialized transmit queues.
77 * @txq_count: Number of initialized transmit queues.
78 * @rxq_mask: Mask of initialized receive queues.
79 * @rxq_count: Number of initialized receive queues.
80 * @rxq_retry_mask: Mask or receive queues that need to be flushed again
81 * due to flush failure.
82 * @rxq_retry_count: Number of receive queues in @rxq_retry_mask.
83 * @reset_work: Work item to schedule a VF reset.
84 */
85 struct siena_vf {
86 struct efx_nic *efx;
87 unsigned int pci_rid;
88 char pci_name[13]; /* dddd:bb:dd.f */
89 unsigned int index;
90 struct work_struct req;
91 u64 req_addr;
92 int req_type;
93 unsigned req_seqno;
94 unsigned msg_seqno;
95 bool busy;
96 struct efx_buffer buf;
97 unsigned buftbl_base;
98 bool rx_filtering;
99 enum efx_filter_flags rx_filter_flags;
100 unsigned rx_filter_qid;
101 int rx_filter_id;
102 enum efx_vf_tx_filter_mode tx_filter_mode;
103 int tx_filter_id;
104 struct vfdi_endpoint addr;
105 u64 status_addr;
106 struct mutex status_lock;
107 u64 *peer_page_addrs;
108 unsigned peer_page_count;
109 u64 evq0_addrs[EFX_MAX_VF_EVQ_SIZE * sizeof(efx_qword_t) /
110 EFX_BUF_SIZE];
111 unsigned evq0_count;
112 wait_queue_head_t flush_waitq;
113 struct mutex txq_lock;
114 unsigned long txq_mask[VI_MASK_LENGTH];
115 unsigned txq_count;
116 unsigned long rxq_mask[VI_MASK_LENGTH];
117 unsigned rxq_count;
118 unsigned long rxq_retry_mask[VI_MASK_LENGTH];
119 atomic_t rxq_retry_count;
120 struct work_struct reset_work;
121 };
122
123 struct efx_memcpy_req {
124 unsigned int from_rid;
125 void *from_buf;
126 u64 from_addr;
127 unsigned int to_rid;
128 u64 to_addr;
129 unsigned length;
130 };
131
132 /**
133 * struct efx_local_addr - A MAC address on the vswitch without a VF.
134 *
135 * Siena does not have a switch, so VFs can't transmit data to each
136 * other. Instead the VFs must be made aware of the local addresses
137 * on the vswitch, so that they can arrange for an alternative
138 * software datapath to be used.
139 *
140 * @link: List head for insertion into efx->local_addr_list.
141 * @addr: Ethernet address
142 */
143 struct efx_local_addr {
144 struct list_head link;
145 u8 addr[ETH_ALEN];
146 };
147
148 /**
149 * struct efx_endpoint_page - Page of vfdi_endpoint structures
150 *
151 * @link: List head for insertion into efx->local_page_list.
152 * @ptr: Pointer to page.
153 * @addr: DMA address of page.
154 */
155 struct efx_endpoint_page {
156 struct list_head link;
157 void *ptr;
158 dma_addr_t addr;
159 };
160
161 /* Buffer table entries are reserved txq0,rxq0,evq0,txq1,rxq1,evq1 */
162 #define EFX_BUFTBL_TXQ_BASE(_vf, _qid) \
163 ((_vf)->buftbl_base + EFX_VF_BUFTBL_PER_VI * (_qid))
164 #define EFX_BUFTBL_RXQ_BASE(_vf, _qid) \
165 (EFX_BUFTBL_TXQ_BASE(_vf, _qid) + \
166 (EFX_MAX_DMAQ_SIZE * sizeof(efx_qword_t) / EFX_BUF_SIZE))
167 #define EFX_BUFTBL_EVQ_BASE(_vf, _qid) \
168 (EFX_BUFTBL_TXQ_BASE(_vf, _qid) + \
169 (2 * EFX_MAX_DMAQ_SIZE * sizeof(efx_qword_t) / EFX_BUF_SIZE))
170
171 #define EFX_FIELD_MASK(_field) \
172 ((1 << _field ## _WIDTH) - 1)
173
174 /* VFs can only use this many transmit channels */
175 static unsigned int vf_max_tx_channels = 2;
176 module_param(vf_max_tx_channels, uint, 0444);
177 MODULE_PARM_DESC(vf_max_tx_channels,
178 "Limit the number of TX channels VFs can use");
179
180 static int max_vfs = -1;
181 module_param(max_vfs, int, 0444);
182 MODULE_PARM_DESC(max_vfs,
183 "Reduce the number of VFs initialized by the driver");
184
185 /* Workqueue used by VFDI communication. We can't use the global
186 * workqueue because it may be running the VF driver's probe()
187 * routine, which will be blocked there waiting for a VFDI response.
188 */
189 static struct workqueue_struct *vfdi_workqueue;
190
191 static unsigned abs_index(struct siena_vf *vf, unsigned index)
192 {
193 return EFX_VI_BASE + vf->index * efx_vf_size(vf->efx) + index;
194 }
195
196 static int efx_siena_sriov_cmd(struct efx_nic *efx, bool enable,
197 unsigned *vi_scale_out, unsigned *vf_total_out)
198 {
199 MCDI_DECLARE_BUF(inbuf, MC_CMD_SRIOV_IN_LEN);
200 MCDI_DECLARE_BUF(outbuf, MC_CMD_SRIOV_OUT_LEN);
201 unsigned vi_scale, vf_total;
202 size_t outlen;
203 int rc;
204
205 MCDI_SET_DWORD(inbuf, SRIOV_IN_ENABLE, enable ? 1 : 0);
206 MCDI_SET_DWORD(inbuf, SRIOV_IN_VI_BASE, EFX_VI_BASE);
207 MCDI_SET_DWORD(inbuf, SRIOV_IN_VF_COUNT, efx->vf_count);
208
209 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_SRIOV, inbuf, MC_CMD_SRIOV_IN_LEN,
210 outbuf, MC_CMD_SRIOV_OUT_LEN, &outlen);
211 if (rc)
212 return rc;
213 if (outlen < MC_CMD_SRIOV_OUT_LEN)
214 return -EIO;
215
216 vf_total = MCDI_DWORD(outbuf, SRIOV_OUT_VF_TOTAL);
217 vi_scale = MCDI_DWORD(outbuf, SRIOV_OUT_VI_SCALE);
218 if (vi_scale > EFX_VI_SCALE_MAX)
219 return -EOPNOTSUPP;
220
221 if (vi_scale_out)
222 *vi_scale_out = vi_scale;
223 if (vf_total_out)
224 *vf_total_out = vf_total;
225
226 return 0;
227 }
228
229 static void efx_siena_sriov_usrev(struct efx_nic *efx, bool enabled)
230 {
231 struct siena_nic_data *nic_data = efx->nic_data;
232 efx_oword_t reg;
233
234 EFX_POPULATE_OWORD_2(reg,
235 FRF_CZ_USREV_DIS, enabled ? 0 : 1,
236 FRF_CZ_DFLT_EVQ, nic_data->vfdi_channel->channel);
237 efx_writeo(efx, &reg, FR_CZ_USR_EV_CFG);
238 }
239
240 static int efx_siena_sriov_memcpy(struct efx_nic *efx,
241 struct efx_memcpy_req *req,
242 unsigned int count)
243 {
244 MCDI_DECLARE_BUF(inbuf, MCDI_CTL_SDU_LEN_MAX_V1);
245 MCDI_DECLARE_STRUCT_PTR(record);
246 unsigned int index, used;
247 u64 from_addr;
248 u32 from_rid;
249 int rc;
250
251 mb(); /* Finish writing source/reading dest before DMA starts */
252
253 if (WARN_ON(count > MC_CMD_MEMCPY_IN_RECORD_MAXNUM))
254 return -ENOBUFS;
255 used = MC_CMD_MEMCPY_IN_LEN(count);
256
257 for (index = 0; index < count; index++) {
258 record = MCDI_ARRAY_STRUCT_PTR(inbuf, MEMCPY_IN_RECORD, index);
259 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_NUM_RECORDS,
260 count);
261 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_TO_RID,
262 req->to_rid);
263 MCDI_SET_QWORD(record, MEMCPY_RECORD_TYPEDEF_TO_ADDR,
264 req->to_addr);
265 if (req->from_buf == NULL) {
266 from_rid = req->from_rid;
267 from_addr = req->from_addr;
268 } else {
269 if (WARN_ON(used + req->length >
270 MCDI_CTL_SDU_LEN_MAX_V1)) {
271 rc = -ENOBUFS;
272 goto out;
273 }
274
275 from_rid = MC_CMD_MEMCPY_RECORD_TYPEDEF_RID_INLINE;
276 from_addr = used;
277 memcpy(_MCDI_PTR(inbuf, used), req->from_buf,
278 req->length);
279 used += req->length;
280 }
281
282 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_FROM_RID, from_rid);
283 MCDI_SET_QWORD(record, MEMCPY_RECORD_TYPEDEF_FROM_ADDR,
284 from_addr);
285 MCDI_SET_DWORD(record, MEMCPY_RECORD_TYPEDEF_LENGTH,
286 req->length);
287
288 ++req;
289 }
290
291 rc = efx_mcdi_rpc(efx, MC_CMD_MEMCPY, inbuf, used, NULL, 0, NULL);
292 out:
293 mb(); /* Don't write source/read dest before DMA is complete */
294
295 return rc;
296 }
297
298 /* The TX filter is entirely controlled by this driver, and is modified
299 * underneath the feet of the VF
300 */
301 static void efx_siena_sriov_reset_tx_filter(struct siena_vf *vf)
302 {
303 struct efx_nic *efx = vf->efx;
304 struct efx_filter_spec filter;
305 u16 vlan;
306 int rc;
307
308 if (vf->tx_filter_id != -1) {
309 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
310 vf->tx_filter_id);
311 netif_dbg(efx, hw, efx->net_dev, "Removed vf %s tx filter %d\n",
312 vf->pci_name, vf->tx_filter_id);
313 vf->tx_filter_id = -1;
314 }
315
316 if (is_zero_ether_addr(vf->addr.mac_addr))
317 return;
318
319 /* Turn on TX filtering automatically if not explicitly
320 * enabled or disabled.
321 */
322 if (vf->tx_filter_mode == VF_TX_FILTER_AUTO && vf_max_tx_channels <= 2)
323 vf->tx_filter_mode = VF_TX_FILTER_ON;
324
325 vlan = ntohs(vf->addr.tci) & VLAN_VID_MASK;
326 efx_filter_init_tx(&filter, abs_index(vf, 0));
327 rc = efx_filter_set_eth_local(&filter,
328 vlan ? vlan : EFX_FILTER_VID_UNSPEC,
329 vf->addr.mac_addr);
330 BUG_ON(rc);
331
332 rc = efx_filter_insert_filter(efx, &filter, true);
333 if (rc < 0) {
334 netif_warn(efx, hw, efx->net_dev,
335 "Unable to migrate tx filter for vf %s\n",
336 vf->pci_name);
337 } else {
338 netif_dbg(efx, hw, efx->net_dev, "Inserted vf %s tx filter %d\n",
339 vf->pci_name, rc);
340 vf->tx_filter_id = rc;
341 }
342 }
343
344 /* The RX filter is managed here on behalf of the VF driver */
345 static void efx_siena_sriov_reset_rx_filter(struct siena_vf *vf)
346 {
347 struct efx_nic *efx = vf->efx;
348 struct efx_filter_spec filter;
349 u16 vlan;
350 int rc;
351
352 if (vf->rx_filter_id != -1) {
353 efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED,
354 vf->rx_filter_id);
355 netif_dbg(efx, hw, efx->net_dev, "Removed vf %s rx filter %d\n",
356 vf->pci_name, vf->rx_filter_id);
357 vf->rx_filter_id = -1;
358 }
359
360 if (!vf->rx_filtering || is_zero_ether_addr(vf->addr.mac_addr))
361 return;
362
363 vlan = ntohs(vf->addr.tci) & VLAN_VID_MASK;
364 efx_filter_init_rx(&filter, EFX_FILTER_PRI_REQUIRED,
365 vf->rx_filter_flags,
366 abs_index(vf, vf->rx_filter_qid));
367 rc = efx_filter_set_eth_local(&filter,
368 vlan ? vlan : EFX_FILTER_VID_UNSPEC,
369 vf->addr.mac_addr);
370 BUG_ON(rc);
371
372 rc = efx_filter_insert_filter(efx, &filter, true);
373 if (rc < 0) {
374 netif_warn(efx, hw, efx->net_dev,
375 "Unable to insert rx filter for vf %s\n",
376 vf->pci_name);
377 } else {
378 netif_dbg(efx, hw, efx->net_dev, "Inserted vf %s rx filter %d\n",
379 vf->pci_name, rc);
380 vf->rx_filter_id = rc;
381 }
382 }
383
384 static void __efx_siena_sriov_update_vf_addr(struct siena_vf *vf)
385 {
386 struct efx_nic *efx = vf->efx;
387 struct siena_nic_data *nic_data = efx->nic_data;
388
389 efx_siena_sriov_reset_tx_filter(vf);
390 efx_siena_sriov_reset_rx_filter(vf);
391 queue_work(vfdi_workqueue, &nic_data->peer_work);
392 }
393
394 /* Push the peer list to this VF. The caller must hold status_lock to interlock
395 * with VFDI requests, and they must be serialised against manipulation of
396 * local_page_list, either by acquiring local_lock or by running from
397 * efx_siena_sriov_peer_work()
398 */
399 static void __efx_siena_sriov_push_vf_status(struct siena_vf *vf)
400 {
401 struct efx_nic *efx = vf->efx;
402 struct siena_nic_data *nic_data = efx->nic_data;
403 struct vfdi_status *status = nic_data->vfdi_status.addr;
404 struct efx_memcpy_req copy[4];
405 struct efx_endpoint_page *epp;
406 unsigned int pos, count;
407 unsigned data_offset;
408 efx_qword_t event;
409
410 WARN_ON(!mutex_is_locked(&vf->status_lock));
411 WARN_ON(!vf->status_addr);
412
413 status->local = vf->addr;
414 status->generation_end = ++status->generation_start;
415
416 memset(copy, '\0', sizeof(copy));
417 /* Write generation_start */
418 copy[0].from_buf = &status->generation_start;
419 copy[0].to_rid = vf->pci_rid;
420 copy[0].to_addr = vf->status_addr + offsetof(struct vfdi_status,
421 generation_start);
422 copy[0].length = sizeof(status->generation_start);
423 /* DMA the rest of the structure (excluding the generations). This
424 * assumes that the non-generation portion of vfdi_status is in
425 * one chunk starting at the version member.
426 */
427 data_offset = offsetof(struct vfdi_status, version);
428 copy[1].from_rid = efx->pci_dev->devfn;
429 copy[1].from_addr = nic_data->vfdi_status.dma_addr + data_offset;
430 copy[1].to_rid = vf->pci_rid;
431 copy[1].to_addr = vf->status_addr + data_offset;
432 copy[1].length = status->length - data_offset;
433
434 /* Copy the peer pages */
435 pos = 2;
436 count = 0;
437 list_for_each_entry(epp, &nic_data->local_page_list, link) {
438 if (count == vf->peer_page_count) {
439 /* The VF driver will know they need to provide more
440 * pages because peer_addr_count is too large.
441 */
442 break;
443 }
444 copy[pos].from_buf = NULL;
445 copy[pos].from_rid = efx->pci_dev->devfn;
446 copy[pos].from_addr = epp->addr;
447 copy[pos].to_rid = vf->pci_rid;
448 copy[pos].to_addr = vf->peer_page_addrs[count];
449 copy[pos].length = EFX_PAGE_SIZE;
450
451 if (++pos == ARRAY_SIZE(copy)) {
452 efx_siena_sriov_memcpy(efx, copy, ARRAY_SIZE(copy));
453 pos = 0;
454 }
455 ++count;
456 }
457
458 /* Write generation_end */
459 copy[pos].from_buf = &status->generation_end;
460 copy[pos].to_rid = vf->pci_rid;
461 copy[pos].to_addr = vf->status_addr + offsetof(struct vfdi_status,
462 generation_end);
463 copy[pos].length = sizeof(status->generation_end);
464 efx_siena_sriov_memcpy(efx, copy, pos + 1);
465
466 /* Notify the guest */
467 EFX_POPULATE_QWORD_3(event,
468 FSF_AZ_EV_CODE, FSE_CZ_EV_CODE_USER_EV,
469 VFDI_EV_SEQ, (vf->msg_seqno & 0xff),
470 VFDI_EV_TYPE, VFDI_EV_TYPE_STATUS);
471 ++vf->msg_seqno;
472 efx_farch_generate_event(efx,
473 EFX_VI_BASE + vf->index * efx_vf_size(efx),
474 &event);
475 }
476
477 static void efx_siena_sriov_bufs(struct efx_nic *efx, unsigned offset,
478 u64 *addr, unsigned count)
479 {
480 efx_qword_t buf;
481 unsigned pos;
482
483 for (pos = 0; pos < count; ++pos) {
484 EFX_POPULATE_QWORD_3(buf,
485 FRF_AZ_BUF_ADR_REGION, 0,
486 FRF_AZ_BUF_ADR_FBUF,
487 addr ? addr[pos] >> 12 : 0,
488 FRF_AZ_BUF_OWNER_ID_FBUF, 0);
489 efx_sram_writeq(efx, efx->membase + FR_BZ_BUF_FULL_TBL,
490 &buf, offset + pos);
491 }
492 }
493
494 static bool bad_vf_index(struct efx_nic *efx, unsigned index)
495 {
496 return index >= efx_vf_size(efx);
497 }
498
499 static bool bad_buf_count(unsigned buf_count, unsigned max_entry_count)
500 {
501 unsigned max_buf_count = max_entry_count *
502 sizeof(efx_qword_t) / EFX_BUF_SIZE;
503
504 return ((buf_count & (buf_count - 1)) || buf_count > max_buf_count);
505 }
506
507 /* Check that VI specified by per-port index belongs to a VF.
508 * Optionally set VF index and VI index within the VF.
509 */
510 static bool map_vi_index(struct efx_nic *efx, unsigned abs_index,
511 struct siena_vf **vf_out, unsigned *rel_index_out)
512 {
513 struct siena_nic_data *nic_data = efx->nic_data;
514 unsigned vf_i;
515
516 if (abs_index < EFX_VI_BASE)
517 return true;
518 vf_i = (abs_index - EFX_VI_BASE) / efx_vf_size(efx);
519 if (vf_i >= efx->vf_init_count)
520 return true;
521
522 if (vf_out)
523 *vf_out = nic_data->vf + vf_i;
524 if (rel_index_out)
525 *rel_index_out = abs_index % efx_vf_size(efx);
526 return false;
527 }
528
529 static int efx_vfdi_init_evq(struct siena_vf *vf)
530 {
531 struct efx_nic *efx = vf->efx;
532 struct vfdi_req *req = vf->buf.addr;
533 unsigned vf_evq = req->u.init_evq.index;
534 unsigned buf_count = req->u.init_evq.buf_count;
535 unsigned abs_evq = abs_index(vf, vf_evq);
536 unsigned buftbl = EFX_BUFTBL_EVQ_BASE(vf, vf_evq);
537 efx_oword_t reg;
538
539 if (bad_vf_index(efx, vf_evq) ||
540 bad_buf_count(buf_count, EFX_MAX_VF_EVQ_SIZE)) {
541 if (net_ratelimit())
542 netif_err(efx, hw, efx->net_dev,
543 "ERROR: Invalid INIT_EVQ from %s: evq %d bufs %d\n",
544 vf->pci_name, vf_evq, buf_count);
545 return VFDI_RC_EINVAL;
546 }
547
548 efx_siena_sriov_bufs(efx, buftbl, req->u.init_evq.addr, buf_count);
549
550 EFX_POPULATE_OWORD_3(reg,
551 FRF_CZ_TIMER_Q_EN, 1,
552 FRF_CZ_HOST_NOTIFY_MODE, 0,
553 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
554 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, abs_evq);
555 EFX_POPULATE_OWORD_3(reg,
556 FRF_AZ_EVQ_EN, 1,
557 FRF_AZ_EVQ_SIZE, __ffs(buf_count),
558 FRF_AZ_EVQ_BUF_BASE_ID, buftbl);
559 efx_writeo_table(efx, &reg, FR_BZ_EVQ_PTR_TBL, abs_evq);
560
561 if (vf_evq == 0) {
562 memcpy(vf->evq0_addrs, req->u.init_evq.addr,
563 buf_count * sizeof(u64));
564 vf->evq0_count = buf_count;
565 }
566
567 return VFDI_RC_SUCCESS;
568 }
569
570 static int efx_vfdi_init_rxq(struct siena_vf *vf)
571 {
572 struct efx_nic *efx = vf->efx;
573 struct vfdi_req *req = vf->buf.addr;
574 unsigned vf_rxq = req->u.init_rxq.index;
575 unsigned vf_evq = req->u.init_rxq.evq;
576 unsigned buf_count = req->u.init_rxq.buf_count;
577 unsigned buftbl = EFX_BUFTBL_RXQ_BASE(vf, vf_rxq);
578 unsigned label;
579 efx_oword_t reg;
580
581 if (bad_vf_index(efx, vf_evq) || bad_vf_index(efx, vf_rxq) ||
582 vf_rxq >= VF_MAX_RX_QUEUES ||
583 bad_buf_count(buf_count, EFX_MAX_DMAQ_SIZE)) {
584 if (net_ratelimit())
585 netif_err(efx, hw, efx->net_dev,
586 "ERROR: Invalid INIT_RXQ from %s: rxq %d evq %d "
587 "buf_count %d\n", vf->pci_name, vf_rxq,
588 vf_evq, buf_count);
589 return VFDI_RC_EINVAL;
590 }
591 if (__test_and_set_bit(req->u.init_rxq.index, vf->rxq_mask))
592 ++vf->rxq_count;
593 efx_siena_sriov_bufs(efx, buftbl, req->u.init_rxq.addr, buf_count);
594
595 label = req->u.init_rxq.label & EFX_FIELD_MASK(FRF_AZ_RX_DESCQ_LABEL);
596 EFX_POPULATE_OWORD_6(reg,
597 FRF_AZ_RX_DESCQ_BUF_BASE_ID, buftbl,
598 FRF_AZ_RX_DESCQ_EVQ_ID, abs_index(vf, vf_evq),
599 FRF_AZ_RX_DESCQ_LABEL, label,
600 FRF_AZ_RX_DESCQ_SIZE, __ffs(buf_count),
601 FRF_AZ_RX_DESCQ_JUMBO,
602 !!(req->u.init_rxq.flags &
603 VFDI_RXQ_FLAG_SCATTER_EN),
604 FRF_AZ_RX_DESCQ_EN, 1);
605 efx_writeo_table(efx, &reg, FR_BZ_RX_DESC_PTR_TBL,
606 abs_index(vf, vf_rxq));
607
608 return VFDI_RC_SUCCESS;
609 }
610
611 static int efx_vfdi_init_txq(struct siena_vf *vf)
612 {
613 struct efx_nic *efx = vf->efx;
614 struct vfdi_req *req = vf->buf.addr;
615 unsigned vf_txq = req->u.init_txq.index;
616 unsigned vf_evq = req->u.init_txq.evq;
617 unsigned buf_count = req->u.init_txq.buf_count;
618 unsigned buftbl = EFX_BUFTBL_TXQ_BASE(vf, vf_txq);
619 unsigned label, eth_filt_en;
620 efx_oword_t reg;
621
622 if (bad_vf_index(efx, vf_evq) || bad_vf_index(efx, vf_txq) ||
623 vf_txq >= vf_max_tx_channels ||
624 bad_buf_count(buf_count, EFX_MAX_DMAQ_SIZE)) {
625 if (net_ratelimit())
626 netif_err(efx, hw, efx->net_dev,
627 "ERROR: Invalid INIT_TXQ from %s: txq %d evq %d "
628 "buf_count %d\n", vf->pci_name, vf_txq,
629 vf_evq, buf_count);
630 return VFDI_RC_EINVAL;
631 }
632
633 mutex_lock(&vf->txq_lock);
634 if (__test_and_set_bit(req->u.init_txq.index, vf->txq_mask))
635 ++vf->txq_count;
636 mutex_unlock(&vf->txq_lock);
637 efx_siena_sriov_bufs(efx, buftbl, req->u.init_txq.addr, buf_count);
638
639 eth_filt_en = vf->tx_filter_mode == VF_TX_FILTER_ON;
640
641 label = req->u.init_txq.label & EFX_FIELD_MASK(FRF_AZ_TX_DESCQ_LABEL);
642 EFX_POPULATE_OWORD_8(reg,
643 FRF_CZ_TX_DPT_Q_MASK_WIDTH, min(efx->vi_scale, 1U),
644 FRF_CZ_TX_DPT_ETH_FILT_EN, eth_filt_en,
645 FRF_AZ_TX_DESCQ_EN, 1,
646 FRF_AZ_TX_DESCQ_BUF_BASE_ID, buftbl,
647 FRF_AZ_TX_DESCQ_EVQ_ID, abs_index(vf, vf_evq),
648 FRF_AZ_TX_DESCQ_LABEL, label,
649 FRF_AZ_TX_DESCQ_SIZE, __ffs(buf_count),
650 FRF_BZ_TX_NON_IP_DROP_DIS, 1);
651 efx_writeo_table(efx, &reg, FR_BZ_TX_DESC_PTR_TBL,
652 abs_index(vf, vf_txq));
653
654 return VFDI_RC_SUCCESS;
655 }
656
657 /* Returns true when efx_vfdi_fini_all_queues should wake */
658 static bool efx_vfdi_flush_wake(struct siena_vf *vf)
659 {
660 /* Ensure that all updates are visible to efx_vfdi_fini_all_queues() */
661 smp_mb();
662
663 return (!vf->txq_count && !vf->rxq_count) ||
664 atomic_read(&vf->rxq_retry_count);
665 }
666
667 static void efx_vfdi_flush_clear(struct siena_vf *vf)
668 {
669 memset(vf->txq_mask, 0, sizeof(vf->txq_mask));
670 vf->txq_count = 0;
671 memset(vf->rxq_mask, 0, sizeof(vf->rxq_mask));
672 vf->rxq_count = 0;
673 memset(vf->rxq_retry_mask, 0, sizeof(vf->rxq_retry_mask));
674 atomic_set(&vf->rxq_retry_count, 0);
675 }
676
677 static int efx_vfdi_fini_all_queues(struct siena_vf *vf)
678 {
679 struct efx_nic *efx = vf->efx;
680 efx_oword_t reg;
681 unsigned count = efx_vf_size(efx);
682 unsigned vf_offset = EFX_VI_BASE + vf->index * efx_vf_size(efx);
683 unsigned timeout = HZ;
684 unsigned index, rxqs_count;
685 MCDI_DECLARE_BUF(inbuf, MC_CMD_FLUSH_RX_QUEUES_IN_LENMAX);
686 int rc;
687
688 BUILD_BUG_ON(VF_MAX_RX_QUEUES >
689 MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
690
691 rtnl_lock();
692 siena_prepare_flush(efx);
693 rtnl_unlock();
694
695 /* Flush all the initialized queues */
696 rxqs_count = 0;
697 for (index = 0; index < count; ++index) {
698 if (test_bit(index, vf->txq_mask)) {
699 EFX_POPULATE_OWORD_2(reg,
700 FRF_AZ_TX_FLUSH_DESCQ_CMD, 1,
701 FRF_AZ_TX_FLUSH_DESCQ,
702 vf_offset + index);
703 efx_writeo(efx, &reg, FR_AZ_TX_FLUSH_DESCQ);
704 }
705 if (test_bit(index, vf->rxq_mask)) {
706 MCDI_SET_ARRAY_DWORD(
707 inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
708 rxqs_count, vf_offset + index);
709 rxqs_count++;
710 }
711 }
712
713 atomic_set(&vf->rxq_retry_count, 0);
714 while (timeout && (vf->rxq_count || vf->txq_count)) {
715 rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
716 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(rxqs_count),
717 NULL, 0, NULL);
718 WARN_ON(rc < 0);
719
720 timeout = wait_event_timeout(vf->flush_waitq,
721 efx_vfdi_flush_wake(vf),
722 timeout);
723 rxqs_count = 0;
724 for (index = 0; index < count; ++index) {
725 if (test_and_clear_bit(index, vf->rxq_retry_mask)) {
726 atomic_dec(&vf->rxq_retry_count);
727 MCDI_SET_ARRAY_DWORD(
728 inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
729 rxqs_count, vf_offset + index);
730 rxqs_count++;
731 }
732 }
733 }
734
735 rtnl_lock();
736 siena_finish_flush(efx);
737 rtnl_unlock();
738
739 /* Irrespective of success/failure, fini the queues */
740 EFX_ZERO_OWORD(reg);
741 for (index = 0; index < count; ++index) {
742 efx_writeo_table(efx, &reg, FR_BZ_RX_DESC_PTR_TBL,
743 vf_offset + index);
744 efx_writeo_table(efx, &reg, FR_BZ_TX_DESC_PTR_TBL,
745 vf_offset + index);
746 efx_writeo_table(efx, &reg, FR_BZ_EVQ_PTR_TBL,
747 vf_offset + index);
748 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL,
749 vf_offset + index);
750 }
751 efx_siena_sriov_bufs(efx, vf->buftbl_base, NULL,
752 EFX_VF_BUFTBL_PER_VI * efx_vf_size(efx));
753 efx_vfdi_flush_clear(vf);
754
755 vf->evq0_count = 0;
756
757 return timeout ? 0 : VFDI_RC_ETIMEDOUT;
758 }
759
760 static int efx_vfdi_insert_filter(struct siena_vf *vf)
761 {
762 struct efx_nic *efx = vf->efx;
763 struct siena_nic_data *nic_data = efx->nic_data;
764 struct vfdi_req *req = vf->buf.addr;
765 unsigned vf_rxq = req->u.mac_filter.rxq;
766 unsigned flags;
767
768 if (bad_vf_index(efx, vf_rxq) || vf->rx_filtering) {
769 if (net_ratelimit())
770 netif_err(efx, hw, efx->net_dev,
771 "ERROR: Invalid INSERT_FILTER from %s: rxq %d "
772 "flags 0x%x\n", vf->pci_name, vf_rxq,
773 req->u.mac_filter.flags);
774 return VFDI_RC_EINVAL;
775 }
776
777 flags = 0;
778 if (req->u.mac_filter.flags & VFDI_MAC_FILTER_FLAG_RSS)
779 flags |= EFX_FILTER_FLAG_RX_RSS;
780 if (req->u.mac_filter.flags & VFDI_MAC_FILTER_FLAG_SCATTER)
781 flags |= EFX_FILTER_FLAG_RX_SCATTER;
782 vf->rx_filter_flags = flags;
783 vf->rx_filter_qid = vf_rxq;
784 vf->rx_filtering = true;
785
786 efx_siena_sriov_reset_rx_filter(vf);
787 queue_work(vfdi_workqueue, &nic_data->peer_work);
788
789 return VFDI_RC_SUCCESS;
790 }
791
792 static int efx_vfdi_remove_all_filters(struct siena_vf *vf)
793 {
794 struct efx_nic *efx = vf->efx;
795 struct siena_nic_data *nic_data = efx->nic_data;
796
797 vf->rx_filtering = false;
798 efx_siena_sriov_reset_rx_filter(vf);
799 queue_work(vfdi_workqueue, &nic_data->peer_work);
800
801 return VFDI_RC_SUCCESS;
802 }
803
804 static int efx_vfdi_set_status_page(struct siena_vf *vf)
805 {
806 struct efx_nic *efx = vf->efx;
807 struct siena_nic_data *nic_data = efx->nic_data;
808 struct vfdi_req *req = vf->buf.addr;
809 u64 page_count = req->u.set_status_page.peer_page_count;
810 u64 max_page_count =
811 (EFX_PAGE_SIZE -
812 offsetof(struct vfdi_req, u.set_status_page.peer_page_addr[0]))
813 / sizeof(req->u.set_status_page.peer_page_addr[0]);
814
815 if (!req->u.set_status_page.dma_addr || page_count > max_page_count) {
816 if (net_ratelimit())
817 netif_err(efx, hw, efx->net_dev,
818 "ERROR: Invalid SET_STATUS_PAGE from %s\n",
819 vf->pci_name);
820 return VFDI_RC_EINVAL;
821 }
822
823 mutex_lock(&nic_data->local_lock);
824 mutex_lock(&vf->status_lock);
825 vf->status_addr = req->u.set_status_page.dma_addr;
826
827 kfree(vf->peer_page_addrs);
828 vf->peer_page_addrs = NULL;
829 vf->peer_page_count = 0;
830
831 if (page_count) {
832 vf->peer_page_addrs = kcalloc(page_count, sizeof(u64),
833 GFP_KERNEL);
834 if (vf->peer_page_addrs) {
835 memcpy(vf->peer_page_addrs,
836 req->u.set_status_page.peer_page_addr,
837 page_count * sizeof(u64));
838 vf->peer_page_count = page_count;
839 }
840 }
841
842 __efx_siena_sriov_push_vf_status(vf);
843 mutex_unlock(&vf->status_lock);
844 mutex_unlock(&nic_data->local_lock);
845
846 return VFDI_RC_SUCCESS;
847 }
848
849 static int efx_vfdi_clear_status_page(struct siena_vf *vf)
850 {
851 mutex_lock(&vf->status_lock);
852 vf->status_addr = 0;
853 mutex_unlock(&vf->status_lock);
854
855 return VFDI_RC_SUCCESS;
856 }
857
858 typedef int (*efx_vfdi_op_t)(struct siena_vf *vf);
859
860 static const efx_vfdi_op_t vfdi_ops[VFDI_OP_LIMIT] = {
861 [VFDI_OP_INIT_EVQ] = efx_vfdi_init_evq,
862 [VFDI_OP_INIT_TXQ] = efx_vfdi_init_txq,
863 [VFDI_OP_INIT_RXQ] = efx_vfdi_init_rxq,
864 [VFDI_OP_FINI_ALL_QUEUES] = efx_vfdi_fini_all_queues,
865 [VFDI_OP_INSERT_FILTER] = efx_vfdi_insert_filter,
866 [VFDI_OP_REMOVE_ALL_FILTERS] = efx_vfdi_remove_all_filters,
867 [VFDI_OP_SET_STATUS_PAGE] = efx_vfdi_set_status_page,
868 [VFDI_OP_CLEAR_STATUS_PAGE] = efx_vfdi_clear_status_page,
869 };
870
871 static void efx_siena_sriov_vfdi(struct work_struct *work)
872 {
873 struct siena_vf *vf = container_of(work, struct siena_vf, req);
874 struct efx_nic *efx = vf->efx;
875 struct vfdi_req *req = vf->buf.addr;
876 struct efx_memcpy_req copy[2];
877 int rc;
878
879 /* Copy this page into the local address space */
880 memset(copy, '\0', sizeof(copy));
881 copy[0].from_rid = vf->pci_rid;
882 copy[0].from_addr = vf->req_addr;
883 copy[0].to_rid = efx->pci_dev->devfn;
884 copy[0].to_addr = vf->buf.dma_addr;
885 copy[0].length = EFX_PAGE_SIZE;
886 rc = efx_siena_sriov_memcpy(efx, copy, 1);
887 if (rc) {
888 /* If we can't get the request, we can't reply to the caller */
889 if (net_ratelimit())
890 netif_err(efx, hw, efx->net_dev,
891 "ERROR: Unable to fetch VFDI request from %s rc %d\n",
892 vf->pci_name, -rc);
893 vf->busy = false;
894 return;
895 }
896
897 if (req->op < VFDI_OP_LIMIT && vfdi_ops[req->op] != NULL) {
898 rc = vfdi_ops[req->op](vf);
899 if (rc == 0) {
900 netif_dbg(efx, hw, efx->net_dev,
901 "vfdi request %d from %s ok\n",
902 req->op, vf->pci_name);
903 }
904 } else {
905 netif_dbg(efx, hw, efx->net_dev,
906 "ERROR: Unrecognised request %d from VF %s addr "
907 "%llx\n", req->op, vf->pci_name,
908 (unsigned long long)vf->req_addr);
909 rc = VFDI_RC_EOPNOTSUPP;
910 }
911
912 /* Allow subsequent VF requests */
913 vf->busy = false;
914 smp_wmb();
915
916 /* Respond to the request */
917 req->rc = rc;
918 req->op = VFDI_OP_RESPONSE;
919
920 memset(copy, '\0', sizeof(copy));
921 copy[0].from_buf = &req->rc;
922 copy[0].to_rid = vf->pci_rid;
923 copy[0].to_addr = vf->req_addr + offsetof(struct vfdi_req, rc);
924 copy[0].length = sizeof(req->rc);
925 copy[1].from_buf = &req->op;
926 copy[1].to_rid = vf->pci_rid;
927 copy[1].to_addr = vf->req_addr + offsetof(struct vfdi_req, op);
928 copy[1].length = sizeof(req->op);
929
930 (void)efx_siena_sriov_memcpy(efx, copy, ARRAY_SIZE(copy));
931 }
932
933
934
935 /* After a reset the event queues inside the guests no longer exist. Fill the
936 * event ring in guest memory with VFDI reset events, then (re-initialise) the
937 * event queue to raise an interrupt. The guest driver will then recover.
938 */
939
940 static void efx_siena_sriov_reset_vf(struct siena_vf *vf,
941 struct efx_buffer *buffer)
942 {
943 struct efx_nic *efx = vf->efx;
944 struct efx_memcpy_req copy_req[4];
945 efx_qword_t event;
946 unsigned int pos, count, k, buftbl, abs_evq;
947 efx_oword_t reg;
948 efx_dword_t ptr;
949 int rc;
950
951 BUG_ON(buffer->len != EFX_PAGE_SIZE);
952
953 if (!vf->evq0_count)
954 return;
955 BUG_ON(vf->evq0_count & (vf->evq0_count - 1));
956
957 mutex_lock(&vf->status_lock);
958 EFX_POPULATE_QWORD_3(event,
959 FSF_AZ_EV_CODE, FSE_CZ_EV_CODE_USER_EV,
960 VFDI_EV_SEQ, vf->msg_seqno,
961 VFDI_EV_TYPE, VFDI_EV_TYPE_RESET);
962 vf->msg_seqno++;
963 for (pos = 0; pos < EFX_PAGE_SIZE; pos += sizeof(event))
964 memcpy(buffer->addr + pos, &event, sizeof(event));
965
966 for (pos = 0; pos < vf->evq0_count; pos += count) {
967 count = min_t(unsigned, vf->evq0_count - pos,
968 ARRAY_SIZE(copy_req));
969 for (k = 0; k < count; k++) {
970 copy_req[k].from_buf = NULL;
971 copy_req[k].from_rid = efx->pci_dev->devfn;
972 copy_req[k].from_addr = buffer->dma_addr;
973 copy_req[k].to_rid = vf->pci_rid;
974 copy_req[k].to_addr = vf->evq0_addrs[pos + k];
975 copy_req[k].length = EFX_PAGE_SIZE;
976 }
977 rc = efx_siena_sriov_memcpy(efx, copy_req, count);
978 if (rc) {
979 if (net_ratelimit())
980 netif_err(efx, hw, efx->net_dev,
981 "ERROR: Unable to notify %s of reset"
982 ": %d\n", vf->pci_name, -rc);
983 break;
984 }
985 }
986
987 /* Reinitialise, arm and trigger evq0 */
988 abs_evq = abs_index(vf, 0);
989 buftbl = EFX_BUFTBL_EVQ_BASE(vf, 0);
990 efx_siena_sriov_bufs(efx, buftbl, vf->evq0_addrs, vf->evq0_count);
991
992 EFX_POPULATE_OWORD_3(reg,
993 FRF_CZ_TIMER_Q_EN, 1,
994 FRF_CZ_HOST_NOTIFY_MODE, 0,
995 FRF_CZ_TIMER_MODE, FFE_CZ_TIMER_MODE_DIS);
996 efx_writeo_table(efx, &reg, FR_BZ_TIMER_TBL, abs_evq);
997 EFX_POPULATE_OWORD_3(reg,
998 FRF_AZ_EVQ_EN, 1,
999 FRF_AZ_EVQ_SIZE, __ffs(vf->evq0_count),
1000 FRF_AZ_EVQ_BUF_BASE_ID, buftbl);
1001 efx_writeo_table(efx, &reg, FR_BZ_EVQ_PTR_TBL, abs_evq);
1002 EFX_POPULATE_DWORD_1(ptr, FRF_AZ_EVQ_RPTR, 0);
1003 efx_writed(efx, &ptr, FR_BZ_EVQ_RPTR + FR_BZ_EVQ_RPTR_STEP * abs_evq);
1004
1005 mutex_unlock(&vf->status_lock);
1006 }
1007
1008 static void efx_siena_sriov_reset_vf_work(struct work_struct *work)
1009 {
1010 struct siena_vf *vf = container_of(work, struct siena_vf, req);
1011 struct efx_nic *efx = vf->efx;
1012 struct efx_buffer buf;
1013
1014 if (!efx_nic_alloc_buffer(efx, &buf, EFX_PAGE_SIZE, GFP_NOIO)) {
1015 efx_siena_sriov_reset_vf(vf, &buf);
1016 efx_nic_free_buffer(efx, &buf);
1017 }
1018 }
1019
1020 static void efx_siena_sriov_handle_no_channel(struct efx_nic *efx)
1021 {
1022 netif_err(efx, drv, efx->net_dev,
1023 "ERROR: IOV requires MSI-X and 1 additional interrupt"
1024 "vector. IOV disabled\n");
1025 efx->vf_count = 0;
1026 }
1027
1028 static int efx_siena_sriov_probe_channel(struct efx_channel *channel)
1029 {
1030 struct siena_nic_data *nic_data = channel->efx->nic_data;
1031 nic_data->vfdi_channel = channel;
1032
1033 return 0;
1034 }
1035
1036 static void
1037 efx_siena_sriov_get_channel_name(struct efx_channel *channel,
1038 char *buf, size_t len)
1039 {
1040 snprintf(buf, len, "%s-iov", channel->efx->name);
1041 }
1042
1043 static const struct efx_channel_type efx_siena_sriov_channel_type = {
1044 .handle_no_channel = efx_siena_sriov_handle_no_channel,
1045 .pre_probe = efx_siena_sriov_probe_channel,
1046 .post_remove = efx_channel_dummy_op_void,
1047 .get_name = efx_siena_sriov_get_channel_name,
1048 /* no copy operation; channel must not be reallocated */
1049 .keep_eventq = true,
1050 };
1051
1052 void efx_siena_sriov_probe(struct efx_nic *efx)
1053 {
1054 unsigned count;
1055
1056 if (!max_vfs)
1057 return;
1058
1059 if (efx_siena_sriov_cmd(efx, false, &efx->vi_scale, &count)) {
1060 netif_info(efx, probe, efx->net_dev, "no SR-IOV VFs probed\n");
1061 return;
1062 }
1063 if (count > 0 && count > max_vfs)
1064 count = max_vfs;
1065
1066 /* efx_nic_dimension_resources() will reduce vf_count as appopriate */
1067 efx->vf_count = count;
1068
1069 efx->extra_channel_type[EFX_EXTRA_CHANNEL_IOV] = &efx_siena_sriov_channel_type;
1070 }
1071
1072 /* Copy the list of individual addresses into the vfdi_status.peers
1073 * array and auxiliary pages, protected by %local_lock. Drop that lock
1074 * and then broadcast the address list to every VF.
1075 */
1076 static void efx_siena_sriov_peer_work(struct work_struct *data)
1077 {
1078 struct siena_nic_data *nic_data = container_of(data,
1079 struct siena_nic_data,
1080 peer_work);
1081 struct efx_nic *efx = nic_data->efx;
1082 struct vfdi_status *vfdi_status = nic_data->vfdi_status.addr;
1083 struct siena_vf *vf;
1084 struct efx_local_addr *local_addr;
1085 struct vfdi_endpoint *peer;
1086 struct efx_endpoint_page *epp;
1087 struct list_head pages;
1088 unsigned int peer_space;
1089 unsigned int peer_count;
1090 unsigned int pos;
1091
1092 mutex_lock(&nic_data->local_lock);
1093
1094 /* Move the existing peer pages off %local_page_list */
1095 INIT_LIST_HEAD(&pages);
1096 list_splice_tail_init(&nic_data->local_page_list, &pages);
1097
1098 /* Populate the VF addresses starting from entry 1 (entry 0 is
1099 * the PF address)
1100 */
1101 peer = vfdi_status->peers + 1;
1102 peer_space = ARRAY_SIZE(vfdi_status->peers) - 1;
1103 peer_count = 1;
1104 for (pos = 0; pos < efx->vf_count; ++pos) {
1105 vf = nic_data->vf + pos;
1106
1107 mutex_lock(&vf->status_lock);
1108 if (vf->rx_filtering && !is_zero_ether_addr(vf->addr.mac_addr)) {
1109 *peer++ = vf->addr;
1110 ++peer_count;
1111 --peer_space;
1112 BUG_ON(peer_space == 0);
1113 }
1114 mutex_unlock(&vf->status_lock);
1115 }
1116
1117 /* Fill the remaining addresses */
1118 list_for_each_entry(local_addr, &nic_data->local_addr_list, link) {
1119 ether_addr_copy(peer->mac_addr, local_addr->addr);
1120 peer->tci = 0;
1121 ++peer;
1122 ++peer_count;
1123 if (--peer_space == 0) {
1124 if (list_empty(&pages)) {
1125 epp = kmalloc(sizeof(*epp), GFP_KERNEL);
1126 if (!epp)
1127 break;
1128 epp->ptr = dma_alloc_coherent(
1129 &efx->pci_dev->dev, EFX_PAGE_SIZE,
1130 &epp->addr, GFP_KERNEL);
1131 if (!epp->ptr) {
1132 kfree(epp);
1133 break;
1134 }
1135 } else {
1136 epp = list_first_entry(
1137 &pages, struct efx_endpoint_page, link);
1138 list_del(&epp->link);
1139 }
1140
1141 list_add_tail(&epp->link, &nic_data->local_page_list);
1142 peer = (struct vfdi_endpoint *)epp->ptr;
1143 peer_space = EFX_PAGE_SIZE / sizeof(struct vfdi_endpoint);
1144 }
1145 }
1146 vfdi_status->peer_count = peer_count;
1147 mutex_unlock(&nic_data->local_lock);
1148
1149 /* Free any now unused endpoint pages */
1150 while (!list_empty(&pages)) {
1151 epp = list_first_entry(
1152 &pages, struct efx_endpoint_page, link);
1153 list_del(&epp->link);
1154 dma_free_coherent(&efx->pci_dev->dev, EFX_PAGE_SIZE,
1155 epp->ptr, epp->addr);
1156 kfree(epp);
1157 }
1158
1159 /* Finally, push the pages */
1160 for (pos = 0; pos < efx->vf_count; ++pos) {
1161 vf = nic_data->vf + pos;
1162
1163 mutex_lock(&vf->status_lock);
1164 if (vf->status_addr)
1165 __efx_siena_sriov_push_vf_status(vf);
1166 mutex_unlock(&vf->status_lock);
1167 }
1168 }
1169
1170 static void efx_siena_sriov_free_local(struct efx_nic *efx)
1171 {
1172 struct siena_nic_data *nic_data = efx->nic_data;
1173 struct efx_local_addr *local_addr;
1174 struct efx_endpoint_page *epp;
1175
1176 while (!list_empty(&nic_data->local_addr_list)) {
1177 local_addr = list_first_entry(&nic_data->local_addr_list,
1178 struct efx_local_addr, link);
1179 list_del(&local_addr->link);
1180 kfree(local_addr);
1181 }
1182
1183 while (!list_empty(&nic_data->local_page_list)) {
1184 epp = list_first_entry(&nic_data->local_page_list,
1185 struct efx_endpoint_page, link);
1186 list_del(&epp->link);
1187 dma_free_coherent(&efx->pci_dev->dev, EFX_PAGE_SIZE,
1188 epp->ptr, epp->addr);
1189 kfree(epp);
1190 }
1191 }
1192
1193 static int efx_siena_sriov_vf_alloc(struct efx_nic *efx)
1194 {
1195 unsigned index;
1196 struct siena_vf *vf;
1197 struct siena_nic_data *nic_data = efx->nic_data;
1198
1199 nic_data->vf = kcalloc(efx->vf_count, sizeof(*nic_data->vf),
1200 GFP_KERNEL);
1201 if (!nic_data->vf)
1202 return -ENOMEM;
1203
1204 for (index = 0; index < efx->vf_count; ++index) {
1205 vf = nic_data->vf + index;
1206
1207 vf->efx = efx;
1208 vf->index = index;
1209 vf->rx_filter_id = -1;
1210 vf->tx_filter_mode = VF_TX_FILTER_AUTO;
1211 vf->tx_filter_id = -1;
1212 INIT_WORK(&vf->req, efx_siena_sriov_vfdi);
1213 INIT_WORK(&vf->reset_work, efx_siena_sriov_reset_vf_work);
1214 init_waitqueue_head(&vf->flush_waitq);
1215 mutex_init(&vf->status_lock);
1216 mutex_init(&vf->txq_lock);
1217 }
1218
1219 return 0;
1220 }
1221
1222 static void efx_siena_sriov_vfs_fini(struct efx_nic *efx)
1223 {
1224 struct siena_nic_data *nic_data = efx->nic_data;
1225 struct siena_vf *vf;
1226 unsigned int pos;
1227
1228 for (pos = 0; pos < efx->vf_count; ++pos) {
1229 vf = nic_data->vf + pos;
1230
1231 efx_nic_free_buffer(efx, &vf->buf);
1232 kfree(vf->peer_page_addrs);
1233 vf->peer_page_addrs = NULL;
1234 vf->peer_page_count = 0;
1235
1236 vf->evq0_count = 0;
1237 }
1238 }
1239
1240 static int efx_siena_sriov_vfs_init(struct efx_nic *efx)
1241 {
1242 struct pci_dev *pci_dev = efx->pci_dev;
1243 struct siena_nic_data *nic_data = efx->nic_data;
1244 unsigned index, devfn, sriov, buftbl_base;
1245 u16 offset, stride;
1246 struct siena_vf *vf;
1247 int rc;
1248
1249 sriov = pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV);
1250 if (!sriov)
1251 return -ENOENT;
1252
1253 pci_read_config_word(pci_dev, sriov + PCI_SRIOV_VF_OFFSET, &offset);
1254 pci_read_config_word(pci_dev, sriov + PCI_SRIOV_VF_STRIDE, &stride);
1255
1256 buftbl_base = nic_data->vf_buftbl_base;
1257 devfn = pci_dev->devfn + offset;
1258 for (index = 0; index < efx->vf_count; ++index) {
1259 vf = nic_data->vf + index;
1260
1261 /* Reserve buffer entries */
1262 vf->buftbl_base = buftbl_base;
1263 buftbl_base += EFX_VF_BUFTBL_PER_VI * efx_vf_size(efx);
1264
1265 vf->pci_rid = devfn;
1266 snprintf(vf->pci_name, sizeof(vf->pci_name),
1267 "%04x:%02x:%02x.%d",
1268 pci_domain_nr(pci_dev->bus), pci_dev->bus->number,
1269 PCI_SLOT(devfn), PCI_FUNC(devfn));
1270
1271 rc = efx_nic_alloc_buffer(efx, &vf->buf, EFX_PAGE_SIZE,
1272 GFP_KERNEL);
1273 if (rc)
1274 goto fail;
1275
1276 devfn += stride;
1277 }
1278
1279 return 0;
1280
1281 fail:
1282 efx_siena_sriov_vfs_fini(efx);
1283 return rc;
1284 }
1285
1286 int efx_siena_sriov_init(struct efx_nic *efx)
1287 {
1288 struct net_device *net_dev = efx->net_dev;
1289 struct siena_nic_data *nic_data = efx->nic_data;
1290 struct vfdi_status *vfdi_status;
1291 int rc;
1292
1293 /* Ensure there's room for vf_channel */
1294 BUILD_BUG_ON(EFX_MAX_CHANNELS + 1 >= EFX_VI_BASE);
1295 /* Ensure that VI_BASE is aligned on VI_SCALE */
1296 BUILD_BUG_ON(EFX_VI_BASE & ((1 << EFX_VI_SCALE_MAX) - 1));
1297
1298 if (efx->vf_count == 0)
1299 return 0;
1300
1301 rc = efx_siena_sriov_cmd(efx, true, NULL, NULL);
1302 if (rc)
1303 goto fail_cmd;
1304
1305 rc = efx_nic_alloc_buffer(efx, &nic_data->vfdi_status,
1306 sizeof(*vfdi_status), GFP_KERNEL);
1307 if (rc)
1308 goto fail_status;
1309 vfdi_status = nic_data->vfdi_status.addr;
1310 memset(vfdi_status, 0, sizeof(*vfdi_status));
1311 vfdi_status->version = 1;
1312 vfdi_status->length = sizeof(*vfdi_status);
1313 vfdi_status->max_tx_channels = vf_max_tx_channels;
1314 vfdi_status->vi_scale = efx->vi_scale;
1315 vfdi_status->rss_rxq_count = efx->rss_spread;
1316 vfdi_status->peer_count = 1 + efx->vf_count;
1317 vfdi_status->timer_quantum_ns = efx->timer_quantum_ns;
1318
1319 rc = efx_siena_sriov_vf_alloc(efx);
1320 if (rc)
1321 goto fail_alloc;
1322
1323 mutex_init(&nic_data->local_lock);
1324 INIT_WORK(&nic_data->peer_work, efx_siena_sriov_peer_work);
1325 INIT_LIST_HEAD(&nic_data->local_addr_list);
1326 INIT_LIST_HEAD(&nic_data->local_page_list);
1327
1328 rc = efx_siena_sriov_vfs_init(efx);
1329 if (rc)
1330 goto fail_vfs;
1331
1332 rtnl_lock();
1333 ether_addr_copy(vfdi_status->peers[0].mac_addr, net_dev->dev_addr);
1334 efx->vf_init_count = efx->vf_count;
1335 rtnl_unlock();
1336
1337 efx_siena_sriov_usrev(efx, true);
1338
1339 /* At this point we must be ready to accept VFDI requests */
1340
1341 rc = pci_enable_sriov(efx->pci_dev, efx->vf_count);
1342 if (rc)
1343 goto fail_pci;
1344
1345 netif_info(efx, probe, net_dev,
1346 "enabled SR-IOV for %d VFs, %d VI per VF\n",
1347 efx->vf_count, efx_vf_size(efx));
1348 return 0;
1349
1350 fail_pci:
1351 efx_siena_sriov_usrev(efx, false);
1352 rtnl_lock();
1353 efx->vf_init_count = 0;
1354 rtnl_unlock();
1355 efx_siena_sriov_vfs_fini(efx);
1356 fail_vfs:
1357 cancel_work_sync(&nic_data->peer_work);
1358 efx_siena_sriov_free_local(efx);
1359 kfree(nic_data->vf);
1360 fail_alloc:
1361 efx_nic_free_buffer(efx, &nic_data->vfdi_status);
1362 fail_status:
1363 efx_siena_sriov_cmd(efx, false, NULL, NULL);
1364 fail_cmd:
1365 return rc;
1366 }
1367
1368 void efx_siena_sriov_fini(struct efx_nic *efx)
1369 {
1370 struct siena_vf *vf;
1371 unsigned int pos;
1372 struct siena_nic_data *nic_data = efx->nic_data;
1373
1374 if (efx->vf_init_count == 0)
1375 return;
1376
1377 /* Disable all interfaces to reconfiguration */
1378 BUG_ON(nic_data->vfdi_channel->enabled);
1379 efx_siena_sriov_usrev(efx, false);
1380 rtnl_lock();
1381 efx->vf_init_count = 0;
1382 rtnl_unlock();
1383
1384 /* Flush all reconfiguration work */
1385 for (pos = 0; pos < efx->vf_count; ++pos) {
1386 vf = nic_data->vf + pos;
1387 cancel_work_sync(&vf->req);
1388 cancel_work_sync(&vf->reset_work);
1389 }
1390 cancel_work_sync(&nic_data->peer_work);
1391
1392 pci_disable_sriov(efx->pci_dev);
1393
1394 /* Tear down back-end state */
1395 efx_siena_sriov_vfs_fini(efx);
1396 efx_siena_sriov_free_local(efx);
1397 kfree(nic_data->vf);
1398 efx_nic_free_buffer(efx, &nic_data->vfdi_status);
1399 efx_siena_sriov_cmd(efx, false, NULL, NULL);
1400 }
1401
1402 void efx_siena_sriov_event(struct efx_channel *channel, efx_qword_t *event)
1403 {
1404 struct efx_nic *efx = channel->efx;
1405 struct siena_vf *vf;
1406 unsigned qid, seq, type, data;
1407
1408 qid = EFX_QWORD_FIELD(*event, FSF_CZ_USER_QID);
1409
1410 /* USR_EV_REG_VALUE is dword0, so access the VFDI_EV fields directly */
1411 BUILD_BUG_ON(FSF_CZ_USER_EV_REG_VALUE_LBN != 0);
1412 seq = EFX_QWORD_FIELD(*event, VFDI_EV_SEQ);
1413 type = EFX_QWORD_FIELD(*event, VFDI_EV_TYPE);
1414 data = EFX_QWORD_FIELD(*event, VFDI_EV_DATA);
1415
1416 netif_vdbg(efx, hw, efx->net_dev,
1417 "USR_EV event from qid %d seq 0x%x type %d data 0x%x\n",
1418 qid, seq, type, data);
1419
1420 if (map_vi_index(efx, qid, &vf, NULL))
1421 return;
1422 if (vf->busy)
1423 goto error;
1424
1425 if (type == VFDI_EV_TYPE_REQ_WORD0) {
1426 /* Resynchronise */
1427 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1428 vf->req_seqno = seq + 1;
1429 vf->req_addr = 0;
1430 } else if (seq != (vf->req_seqno++ & 0xff) || type != vf->req_type)
1431 goto error;
1432
1433 switch (vf->req_type) {
1434 case VFDI_EV_TYPE_REQ_WORD0:
1435 case VFDI_EV_TYPE_REQ_WORD1:
1436 case VFDI_EV_TYPE_REQ_WORD2:
1437 vf->req_addr |= (u64)data << (vf->req_type << 4);
1438 ++vf->req_type;
1439 return;
1440
1441 case VFDI_EV_TYPE_REQ_WORD3:
1442 vf->req_addr |= (u64)data << 48;
1443 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1444 vf->busy = true;
1445 queue_work(vfdi_workqueue, &vf->req);
1446 return;
1447 }
1448
1449 error:
1450 if (net_ratelimit())
1451 netif_err(efx, hw, efx->net_dev,
1452 "ERROR: Screaming VFDI request from %s\n",
1453 vf->pci_name);
1454 /* Reset the request and sequence number */
1455 vf->req_type = VFDI_EV_TYPE_REQ_WORD0;
1456 vf->req_seqno = seq + 1;
1457 }
1458
1459 void efx_siena_sriov_flr(struct efx_nic *efx, unsigned vf_i)
1460 {
1461 struct siena_nic_data *nic_data = efx->nic_data;
1462 struct siena_vf *vf;
1463
1464 if (vf_i > efx->vf_init_count)
1465 return;
1466 vf = nic_data->vf + vf_i;
1467 netif_info(efx, hw, efx->net_dev,
1468 "FLR on VF %s\n", vf->pci_name);
1469
1470 vf->status_addr = 0;
1471 efx_vfdi_remove_all_filters(vf);
1472 efx_vfdi_flush_clear(vf);
1473
1474 vf->evq0_count = 0;
1475 }
1476
1477 int efx_siena_sriov_mac_address_changed(struct efx_nic *efx)
1478 {
1479 struct siena_nic_data *nic_data = efx->nic_data;
1480 struct vfdi_status *vfdi_status = nic_data->vfdi_status.addr;
1481
1482 if (!efx->vf_init_count)
1483 return 0;
1484 ether_addr_copy(vfdi_status->peers[0].mac_addr,
1485 efx->net_dev->dev_addr);
1486 queue_work(vfdi_workqueue, &nic_data->peer_work);
1487
1488 return 0;
1489 }
1490
1491 void efx_siena_sriov_tx_flush_done(struct efx_nic *efx, efx_qword_t *event)
1492 {
1493 struct siena_vf *vf;
1494 unsigned queue, qid;
1495
1496 queue = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA);
1497 if (map_vi_index(efx, queue, &vf, &qid))
1498 return;
1499 /* Ignore flush completions triggered by an FLR */
1500 if (!test_bit(qid, vf->txq_mask))
1501 return;
1502
1503 __clear_bit(qid, vf->txq_mask);
1504 --vf->txq_count;
1505
1506 if (efx_vfdi_flush_wake(vf))
1507 wake_up(&vf->flush_waitq);
1508 }
1509
1510 void efx_siena_sriov_rx_flush_done(struct efx_nic *efx, efx_qword_t *event)
1511 {
1512 struct siena_vf *vf;
1513 unsigned ev_failed, queue, qid;
1514
1515 queue = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID);
1516 ev_failed = EFX_QWORD_FIELD(*event,
1517 FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL);
1518 if (map_vi_index(efx, queue, &vf, &qid))
1519 return;
1520 if (!test_bit(qid, vf->rxq_mask))
1521 return;
1522
1523 if (ev_failed) {
1524 set_bit(qid, vf->rxq_retry_mask);
1525 atomic_inc(&vf->rxq_retry_count);
1526 } else {
1527 __clear_bit(qid, vf->rxq_mask);
1528 --vf->rxq_count;
1529 }
1530 if (efx_vfdi_flush_wake(vf))
1531 wake_up(&vf->flush_waitq);
1532 }
1533
1534 /* Called from napi. Schedule the reset work item */
1535 void efx_siena_sriov_desc_fetch_err(struct efx_nic *efx, unsigned dmaq)
1536 {
1537 struct siena_vf *vf;
1538 unsigned int rel;
1539
1540 if (map_vi_index(efx, dmaq, &vf, &rel))
1541 return;
1542
1543 if (net_ratelimit())
1544 netif_err(efx, hw, efx->net_dev,
1545 "VF %d DMA Q %d reports descriptor fetch error.\n",
1546 vf->index, rel);
1547 queue_work(vfdi_workqueue, &vf->reset_work);
1548 }
1549
1550 /* Reset all VFs */
1551 void efx_siena_sriov_reset(struct efx_nic *efx)
1552 {
1553 struct siena_nic_data *nic_data = efx->nic_data;
1554 unsigned int vf_i;
1555 struct efx_buffer buf;
1556 struct siena_vf *vf;
1557
1558 ASSERT_RTNL();
1559
1560 if (efx->vf_init_count == 0)
1561 return;
1562
1563 efx_siena_sriov_usrev(efx, true);
1564 (void)efx_siena_sriov_cmd(efx, true, NULL, NULL);
1565
1566 if (efx_nic_alloc_buffer(efx, &buf, EFX_PAGE_SIZE, GFP_NOIO))
1567 return;
1568
1569 for (vf_i = 0; vf_i < efx->vf_init_count; ++vf_i) {
1570 vf = nic_data->vf + vf_i;
1571 efx_siena_sriov_reset_vf(vf, &buf);
1572 }
1573
1574 efx_nic_free_buffer(efx, &buf);
1575 }
1576
1577 int efx_init_sriov(void)
1578 {
1579 /* A single threaded workqueue is sufficient. efx_siena_sriov_vfdi() and
1580 * efx_siena_sriov_peer_work() spend almost all their time sleeping for
1581 * MCDI to complete anyway
1582 */
1583 vfdi_workqueue = create_singlethread_workqueue("sfc_vfdi");
1584 if (!vfdi_workqueue)
1585 return -ENOMEM;
1586 return 0;
1587 }
1588
1589 void efx_fini_sriov(void)
1590 {
1591 destroy_workqueue(vfdi_workqueue);
1592 }
1593
1594 int efx_siena_sriov_set_vf_mac(struct efx_nic *efx, int vf_i, u8 *mac)
1595 {
1596 struct siena_nic_data *nic_data = efx->nic_data;
1597 struct siena_vf *vf;
1598
1599 if (vf_i >= efx->vf_init_count)
1600 return -EINVAL;
1601 vf = nic_data->vf + vf_i;
1602
1603 mutex_lock(&vf->status_lock);
1604 ether_addr_copy(vf->addr.mac_addr, mac);
1605 __efx_siena_sriov_update_vf_addr(vf);
1606 mutex_unlock(&vf->status_lock);
1607
1608 return 0;
1609 }
1610
1611 int efx_siena_sriov_set_vf_vlan(struct efx_nic *efx, int vf_i,
1612 u16 vlan, u8 qos)
1613 {
1614 struct siena_nic_data *nic_data = efx->nic_data;
1615 struct siena_vf *vf;
1616 u16 tci;
1617
1618 if (vf_i >= efx->vf_init_count)
1619 return -EINVAL;
1620 vf = nic_data->vf + vf_i;
1621
1622 mutex_lock(&vf->status_lock);
1623 tci = (vlan & VLAN_VID_MASK) | ((qos & 0x7) << VLAN_PRIO_SHIFT);
1624 vf->addr.tci = htons(tci);
1625 __efx_siena_sriov_update_vf_addr(vf);
1626 mutex_unlock(&vf->status_lock);
1627
1628 return 0;
1629 }
1630
1631 int efx_siena_sriov_set_vf_spoofchk(struct efx_nic *efx, int vf_i,
1632 bool spoofchk)
1633 {
1634 struct siena_nic_data *nic_data = efx->nic_data;
1635 struct siena_vf *vf;
1636 int rc;
1637
1638 if (vf_i >= efx->vf_init_count)
1639 return -EINVAL;
1640 vf = nic_data->vf + vf_i;
1641
1642 mutex_lock(&vf->txq_lock);
1643 if (vf->txq_count == 0) {
1644 vf->tx_filter_mode =
1645 spoofchk ? VF_TX_FILTER_ON : VF_TX_FILTER_OFF;
1646 rc = 0;
1647 } else {
1648 /* This cannot be changed while TX queues are running */
1649 rc = -EBUSY;
1650 }
1651 mutex_unlock(&vf->txq_lock);
1652 return rc;
1653 }
1654
1655 int efx_siena_sriov_get_vf_config(struct efx_nic *efx, int vf_i,
1656 struct ifla_vf_info *ivi)
1657 {
1658 struct siena_nic_data *nic_data = efx->nic_data;
1659 struct siena_vf *vf;
1660 u16 tci;
1661
1662 if (vf_i >= efx->vf_init_count)
1663 return -EINVAL;
1664 vf = nic_data->vf + vf_i;
1665
1666 ivi->vf = vf_i;
1667 ether_addr_copy(ivi->mac, vf->addr.mac_addr);
1668 ivi->max_tx_rate = 0;
1669 ivi->min_tx_rate = 0;
1670 tci = ntohs(vf->addr.tci);
1671 ivi->vlan = tci & VLAN_VID_MASK;
1672 ivi->qos = (tci >> VLAN_PRIO_SHIFT) & 0x7;
1673 ivi->spoofchk = vf->tx_filter_mode == VF_TX_FILTER_ON;
1674
1675 return 0;
1676 }
1677
1678 bool efx_siena_sriov_wanted(struct efx_nic *efx)
1679 {
1680 return efx->vf_count != 0;
1681 }
1682
1683 int efx_siena_sriov_configure(struct efx_nic *efx, int num_vfs)
1684 {
1685 return 0;
1686 }
Linux with added FPC-III support