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Merge branch 'x86-atomic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / net / enic / enic_main.c
1 /*
2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 *
18 */
19
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/workqueue.h>
28 #include <linux/pci.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/if_ether.h>
32 #include <linux/if_vlan.h>
33 #include <linux/ethtool.h>
34 #include <linux/in.h>
35 #include <linux/ip.h>
36 #include <linux/ipv6.h>
37 #include <linux/tcp.h>
38 #include <linux/rtnetlink.h>
39 #include <linux/prefetch.h>
40 #include <net/ip6_checksum.h>
41
42 #include "cq_enet_desc.h"
43 #include "vnic_dev.h"
44 #include "vnic_intr.h"
45 #include "vnic_stats.h"
46 #include "vnic_vic.h"
47 #include "enic_res.h"
48 #include "enic.h"
49 #include "enic_dev.h"
50 #include "enic_pp.h"
51
52 #define ENIC_NOTIFY_TIMER_PERIOD (2 * HZ)
53 #define WQ_ENET_MAX_DESC_LEN (1 << WQ_ENET_LEN_BITS)
54 #define MAX_TSO (1 << 16)
55 #define ENIC_DESC_MAX_SPLITS (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
56
57 #define PCI_DEVICE_ID_CISCO_VIC_ENET 0x0043 /* ethernet vnic */
58 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN 0x0044 /* enet dynamic vnic */
59
60 /* Supported devices */
61 static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
62 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
63 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
64 { 0, } /* end of table */
65 };
66
67 MODULE_DESCRIPTION(DRV_DESCRIPTION);
68 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
69 MODULE_LICENSE("GPL");
70 MODULE_VERSION(DRV_VERSION);
71 MODULE_DEVICE_TABLE(pci, enic_id_table);
72
73 struct enic_stat {
74 char name[ETH_GSTRING_LEN];
75 unsigned int offset;
76 };
77
78 #define ENIC_TX_STAT(stat) \
79 { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
80 #define ENIC_RX_STAT(stat) \
81 { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
82
83 static const struct enic_stat enic_tx_stats[] = {
84 ENIC_TX_STAT(tx_frames_ok),
85 ENIC_TX_STAT(tx_unicast_frames_ok),
86 ENIC_TX_STAT(tx_multicast_frames_ok),
87 ENIC_TX_STAT(tx_broadcast_frames_ok),
88 ENIC_TX_STAT(tx_bytes_ok),
89 ENIC_TX_STAT(tx_unicast_bytes_ok),
90 ENIC_TX_STAT(tx_multicast_bytes_ok),
91 ENIC_TX_STAT(tx_broadcast_bytes_ok),
92 ENIC_TX_STAT(tx_drops),
93 ENIC_TX_STAT(tx_errors),
94 ENIC_TX_STAT(tx_tso),
95 };
96
97 static const struct enic_stat enic_rx_stats[] = {
98 ENIC_RX_STAT(rx_frames_ok),
99 ENIC_RX_STAT(rx_frames_total),
100 ENIC_RX_STAT(rx_unicast_frames_ok),
101 ENIC_RX_STAT(rx_multicast_frames_ok),
102 ENIC_RX_STAT(rx_broadcast_frames_ok),
103 ENIC_RX_STAT(rx_bytes_ok),
104 ENIC_RX_STAT(rx_unicast_bytes_ok),
105 ENIC_RX_STAT(rx_multicast_bytes_ok),
106 ENIC_RX_STAT(rx_broadcast_bytes_ok),
107 ENIC_RX_STAT(rx_drop),
108 ENIC_RX_STAT(rx_no_bufs),
109 ENIC_RX_STAT(rx_errors),
110 ENIC_RX_STAT(rx_rss),
111 ENIC_RX_STAT(rx_crc_errors),
112 ENIC_RX_STAT(rx_frames_64),
113 ENIC_RX_STAT(rx_frames_127),
114 ENIC_RX_STAT(rx_frames_255),
115 ENIC_RX_STAT(rx_frames_511),
116 ENIC_RX_STAT(rx_frames_1023),
117 ENIC_RX_STAT(rx_frames_1518),
118 ENIC_RX_STAT(rx_frames_to_max),
119 };
120
121 static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
122 static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
123
124 static int enic_is_dynamic(struct enic *enic)
125 {
126 return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
127 }
128
129 static inline unsigned int enic_cq_rq(struct enic *enic, unsigned int rq)
130 {
131 return rq;
132 }
133
134 static inline unsigned int enic_cq_wq(struct enic *enic, unsigned int wq)
135 {
136 return enic->rq_count + wq;
137 }
138
139 static inline unsigned int enic_legacy_io_intr(void)
140 {
141 return 0;
142 }
143
144 static inline unsigned int enic_legacy_err_intr(void)
145 {
146 return 1;
147 }
148
149 static inline unsigned int enic_legacy_notify_intr(void)
150 {
151 return 2;
152 }
153
154 static inline unsigned int enic_msix_rq_intr(struct enic *enic, unsigned int rq)
155 {
156 return enic->cq[enic_cq_rq(enic, rq)].interrupt_offset;
157 }
158
159 static inline unsigned int enic_msix_wq_intr(struct enic *enic, unsigned int wq)
160 {
161 return enic->cq[enic_cq_wq(enic, wq)].interrupt_offset;
162 }
163
164 static inline unsigned int enic_msix_err_intr(struct enic *enic)
165 {
166 return enic->rq_count + enic->wq_count;
167 }
168
169 static inline unsigned int enic_msix_notify_intr(struct enic *enic)
170 {
171 return enic->rq_count + enic->wq_count + 1;
172 }
173
174 static int enic_get_settings(struct net_device *netdev,
175 struct ethtool_cmd *ecmd)
176 {
177 struct enic *enic = netdev_priv(netdev);
178
179 ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
180 ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
181 ecmd->port = PORT_FIBRE;
182 ecmd->transceiver = XCVR_EXTERNAL;
183
184 if (netif_carrier_ok(netdev)) {
185 ethtool_cmd_speed_set(ecmd, vnic_dev_port_speed(enic->vdev));
186 ecmd->duplex = DUPLEX_FULL;
187 } else {
188 ethtool_cmd_speed_set(ecmd, -1);
189 ecmd->duplex = -1;
190 }
191
192 ecmd->autoneg = AUTONEG_DISABLE;
193
194 return 0;
195 }
196
197 static void enic_get_drvinfo(struct net_device *netdev,
198 struct ethtool_drvinfo *drvinfo)
199 {
200 struct enic *enic = netdev_priv(netdev);
201 struct vnic_devcmd_fw_info *fw_info;
202
203 enic_dev_fw_info(enic, &fw_info);
204
205 strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
206 strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
207 strncpy(drvinfo->fw_version, fw_info->fw_version,
208 sizeof(drvinfo->fw_version));
209 strncpy(drvinfo->bus_info, pci_name(enic->pdev),
210 sizeof(drvinfo->bus_info));
211 }
212
213 static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
214 {
215 unsigned int i;
216
217 switch (stringset) {
218 case ETH_SS_STATS:
219 for (i = 0; i < enic_n_tx_stats; i++) {
220 memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
221 data += ETH_GSTRING_LEN;
222 }
223 for (i = 0; i < enic_n_rx_stats; i++) {
224 memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
225 data += ETH_GSTRING_LEN;
226 }
227 break;
228 }
229 }
230
231 static int enic_get_sset_count(struct net_device *netdev, int sset)
232 {
233 switch (sset) {
234 case ETH_SS_STATS:
235 return enic_n_tx_stats + enic_n_rx_stats;
236 default:
237 return -EOPNOTSUPP;
238 }
239 }
240
241 static void enic_get_ethtool_stats(struct net_device *netdev,
242 struct ethtool_stats *stats, u64 *data)
243 {
244 struct enic *enic = netdev_priv(netdev);
245 struct vnic_stats *vstats;
246 unsigned int i;
247
248 enic_dev_stats_dump(enic, &vstats);
249
250 for (i = 0; i < enic_n_tx_stats; i++)
251 *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
252 for (i = 0; i < enic_n_rx_stats; i++)
253 *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
254 }
255
256 static u32 enic_get_msglevel(struct net_device *netdev)
257 {
258 struct enic *enic = netdev_priv(netdev);
259 return enic->msg_enable;
260 }
261
262 static void enic_set_msglevel(struct net_device *netdev, u32 value)
263 {
264 struct enic *enic = netdev_priv(netdev);
265 enic->msg_enable = value;
266 }
267
268 static int enic_get_coalesce(struct net_device *netdev,
269 struct ethtool_coalesce *ecmd)
270 {
271 struct enic *enic = netdev_priv(netdev);
272
273 ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
274 ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
275
276 return 0;
277 }
278
279 static int enic_set_coalesce(struct net_device *netdev,
280 struct ethtool_coalesce *ecmd)
281 {
282 struct enic *enic = netdev_priv(netdev);
283 u32 tx_coalesce_usecs;
284 u32 rx_coalesce_usecs;
285 unsigned int i, intr;
286
287 tx_coalesce_usecs = min_t(u32, ecmd->tx_coalesce_usecs,
288 vnic_dev_get_intr_coal_timer_max(enic->vdev));
289 rx_coalesce_usecs = min_t(u32, ecmd->rx_coalesce_usecs,
290 vnic_dev_get_intr_coal_timer_max(enic->vdev));
291
292 switch (vnic_dev_get_intr_mode(enic->vdev)) {
293 case VNIC_DEV_INTR_MODE_INTX:
294 if (tx_coalesce_usecs != rx_coalesce_usecs)
295 return -EINVAL;
296
297 intr = enic_legacy_io_intr();
298 vnic_intr_coalescing_timer_set(&enic->intr[intr],
299 tx_coalesce_usecs);
300 break;
301 case VNIC_DEV_INTR_MODE_MSI:
302 if (tx_coalesce_usecs != rx_coalesce_usecs)
303 return -EINVAL;
304
305 vnic_intr_coalescing_timer_set(&enic->intr[0],
306 tx_coalesce_usecs);
307 break;
308 case VNIC_DEV_INTR_MODE_MSIX:
309 for (i = 0; i < enic->wq_count; i++) {
310 intr = enic_msix_wq_intr(enic, i);
311 vnic_intr_coalescing_timer_set(&enic->intr[intr],
312 tx_coalesce_usecs);
313 }
314
315 for (i = 0; i < enic->rq_count; i++) {
316 intr = enic_msix_rq_intr(enic, i);
317 vnic_intr_coalescing_timer_set(&enic->intr[intr],
318 rx_coalesce_usecs);
319 }
320
321 break;
322 default:
323 break;
324 }
325
326 enic->tx_coalesce_usecs = tx_coalesce_usecs;
327 enic->rx_coalesce_usecs = rx_coalesce_usecs;
328
329 return 0;
330 }
331
332 static const struct ethtool_ops enic_ethtool_ops = {
333 .get_settings = enic_get_settings,
334 .get_drvinfo = enic_get_drvinfo,
335 .get_msglevel = enic_get_msglevel,
336 .set_msglevel = enic_set_msglevel,
337 .get_link = ethtool_op_get_link,
338 .get_strings = enic_get_strings,
339 .get_sset_count = enic_get_sset_count,
340 .get_ethtool_stats = enic_get_ethtool_stats,
341 .get_coalesce = enic_get_coalesce,
342 .set_coalesce = enic_set_coalesce,
343 };
344
345 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
346 {
347 struct enic *enic = vnic_dev_priv(wq->vdev);
348
349 if (buf->sop)
350 pci_unmap_single(enic->pdev, buf->dma_addr,
351 buf->len, PCI_DMA_TODEVICE);
352 else
353 pci_unmap_page(enic->pdev, buf->dma_addr,
354 buf->len, PCI_DMA_TODEVICE);
355
356 if (buf->os_buf)
357 dev_kfree_skb_any(buf->os_buf);
358 }
359
360 static void enic_wq_free_buf(struct vnic_wq *wq,
361 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
362 {
363 enic_free_wq_buf(wq, buf);
364 }
365
366 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
367 u8 type, u16 q_number, u16 completed_index, void *opaque)
368 {
369 struct enic *enic = vnic_dev_priv(vdev);
370
371 spin_lock(&enic->wq_lock[q_number]);
372
373 vnic_wq_service(&enic->wq[q_number], cq_desc,
374 completed_index, enic_wq_free_buf,
375 opaque);
376
377 if (netif_queue_stopped(enic->netdev) &&
378 vnic_wq_desc_avail(&enic->wq[q_number]) >=
379 (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
380 netif_wake_queue(enic->netdev);
381
382 spin_unlock(&enic->wq_lock[q_number]);
383
384 return 0;
385 }
386
387 static void enic_log_q_error(struct enic *enic)
388 {
389 unsigned int i;
390 u32 error_status;
391
392 for (i = 0; i < enic->wq_count; i++) {
393 error_status = vnic_wq_error_status(&enic->wq[i]);
394 if (error_status)
395 netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
396 i, error_status);
397 }
398
399 for (i = 0; i < enic->rq_count; i++) {
400 error_status = vnic_rq_error_status(&enic->rq[i]);
401 if (error_status)
402 netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
403 i, error_status);
404 }
405 }
406
407 static void enic_msglvl_check(struct enic *enic)
408 {
409 u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
410
411 if (msg_enable != enic->msg_enable) {
412 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
413 enic->msg_enable, msg_enable);
414 enic->msg_enable = msg_enable;
415 }
416 }
417
418 static void enic_mtu_check(struct enic *enic)
419 {
420 u32 mtu = vnic_dev_mtu(enic->vdev);
421 struct net_device *netdev = enic->netdev;
422
423 if (mtu && mtu != enic->port_mtu) {
424 enic->port_mtu = mtu;
425 if (enic_is_dynamic(enic)) {
426 mtu = max_t(int, ENIC_MIN_MTU,
427 min_t(int, ENIC_MAX_MTU, mtu));
428 if (mtu != netdev->mtu)
429 schedule_work(&enic->change_mtu_work);
430 } else {
431 if (mtu < netdev->mtu)
432 netdev_warn(netdev,
433 "interface MTU (%d) set higher "
434 "than switch port MTU (%d)\n",
435 netdev->mtu, mtu);
436 }
437 }
438 }
439
440 static void enic_link_check(struct enic *enic)
441 {
442 int link_status = vnic_dev_link_status(enic->vdev);
443 int carrier_ok = netif_carrier_ok(enic->netdev);
444
445 if (link_status && !carrier_ok) {
446 netdev_info(enic->netdev, "Link UP\n");
447 netif_carrier_on(enic->netdev);
448 } else if (!link_status && carrier_ok) {
449 netdev_info(enic->netdev, "Link DOWN\n");
450 netif_carrier_off(enic->netdev);
451 }
452 }
453
454 static void enic_notify_check(struct enic *enic)
455 {
456 enic_msglvl_check(enic);
457 enic_mtu_check(enic);
458 enic_link_check(enic);
459 }
460
461 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
462
463 static irqreturn_t enic_isr_legacy(int irq, void *data)
464 {
465 struct net_device *netdev = data;
466 struct enic *enic = netdev_priv(netdev);
467 unsigned int io_intr = enic_legacy_io_intr();
468 unsigned int err_intr = enic_legacy_err_intr();
469 unsigned int notify_intr = enic_legacy_notify_intr();
470 u32 pba;
471
472 vnic_intr_mask(&enic->intr[io_intr]);
473
474 pba = vnic_intr_legacy_pba(enic->legacy_pba);
475 if (!pba) {
476 vnic_intr_unmask(&enic->intr[io_intr]);
477 return IRQ_NONE; /* not our interrupt */
478 }
479
480 if (ENIC_TEST_INTR(pba, notify_intr)) {
481 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
482 enic_notify_check(enic);
483 }
484
485 if (ENIC_TEST_INTR(pba, err_intr)) {
486 vnic_intr_return_all_credits(&enic->intr[err_intr]);
487 enic_log_q_error(enic);
488 /* schedule recovery from WQ/RQ error */
489 schedule_work(&enic->reset);
490 return IRQ_HANDLED;
491 }
492
493 if (ENIC_TEST_INTR(pba, io_intr)) {
494 if (napi_schedule_prep(&enic->napi[0]))
495 __napi_schedule(&enic->napi[0]);
496 } else {
497 vnic_intr_unmask(&enic->intr[io_intr]);
498 }
499
500 return IRQ_HANDLED;
501 }
502
503 static irqreturn_t enic_isr_msi(int irq, void *data)
504 {
505 struct enic *enic = data;
506
507 /* With MSI, there is no sharing of interrupts, so this is
508 * our interrupt and there is no need to ack it. The device
509 * is not providing per-vector masking, so the OS will not
510 * write to PCI config space to mask/unmask the interrupt.
511 * We're using mask_on_assertion for MSI, so the device
512 * automatically masks the interrupt when the interrupt is
513 * generated. Later, when exiting polling, the interrupt
514 * will be unmasked (see enic_poll).
515 *
516 * Also, the device uses the same PCIe Traffic Class (TC)
517 * for Memory Write data and MSI, so there are no ordering
518 * issues; the MSI will always arrive at the Root Complex
519 * _after_ corresponding Memory Writes (i.e. descriptor
520 * writes).
521 */
522
523 napi_schedule(&enic->napi[0]);
524
525 return IRQ_HANDLED;
526 }
527
528 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
529 {
530 struct napi_struct *napi = data;
531
532 /* schedule NAPI polling for RQ cleanup */
533 napi_schedule(napi);
534
535 return IRQ_HANDLED;
536 }
537
538 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
539 {
540 struct enic *enic = data;
541 unsigned int cq = enic_cq_wq(enic, 0);
542 unsigned int intr = enic_msix_wq_intr(enic, 0);
543 unsigned int wq_work_to_do = -1; /* no limit */
544 unsigned int wq_work_done;
545
546 wq_work_done = vnic_cq_service(&enic->cq[cq],
547 wq_work_to_do, enic_wq_service, NULL);
548
549 vnic_intr_return_credits(&enic->intr[intr],
550 wq_work_done,
551 1 /* unmask intr */,
552 1 /* reset intr timer */);
553
554 return IRQ_HANDLED;
555 }
556
557 static irqreturn_t enic_isr_msix_err(int irq, void *data)
558 {
559 struct enic *enic = data;
560 unsigned int intr = enic_msix_err_intr(enic);
561
562 vnic_intr_return_all_credits(&enic->intr[intr]);
563
564 enic_log_q_error(enic);
565
566 /* schedule recovery from WQ/RQ error */
567 schedule_work(&enic->reset);
568
569 return IRQ_HANDLED;
570 }
571
572 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
573 {
574 struct enic *enic = data;
575 unsigned int intr = enic_msix_notify_intr(enic);
576
577 vnic_intr_return_all_credits(&enic->intr[intr]);
578 enic_notify_check(enic);
579
580 return IRQ_HANDLED;
581 }
582
583 static inline void enic_queue_wq_skb_cont(struct enic *enic,
584 struct vnic_wq *wq, struct sk_buff *skb,
585 unsigned int len_left, int loopback)
586 {
587 skb_frag_t *frag;
588
589 /* Queue additional data fragments */
590 for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
591 len_left -= frag->size;
592 enic_queue_wq_desc_cont(wq, skb,
593 pci_map_page(enic->pdev, frag->page,
594 frag->page_offset, frag->size,
595 PCI_DMA_TODEVICE),
596 frag->size,
597 (len_left == 0), /* EOP? */
598 loopback);
599 }
600 }
601
602 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
603 struct vnic_wq *wq, struct sk_buff *skb,
604 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
605 {
606 unsigned int head_len = skb_headlen(skb);
607 unsigned int len_left = skb->len - head_len;
608 int eop = (len_left == 0);
609
610 /* Queue the main skb fragment. The fragments are no larger
611 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
612 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
613 * per fragment is queued.
614 */
615 enic_queue_wq_desc(wq, skb,
616 pci_map_single(enic->pdev, skb->data,
617 head_len, PCI_DMA_TODEVICE),
618 head_len,
619 vlan_tag_insert, vlan_tag,
620 eop, loopback);
621
622 if (!eop)
623 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
624 }
625
626 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
627 struct vnic_wq *wq, struct sk_buff *skb,
628 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
629 {
630 unsigned int head_len = skb_headlen(skb);
631 unsigned int len_left = skb->len - head_len;
632 unsigned int hdr_len = skb_checksum_start_offset(skb);
633 unsigned int csum_offset = hdr_len + skb->csum_offset;
634 int eop = (len_left == 0);
635
636 /* Queue the main skb fragment. The fragments are no larger
637 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
638 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
639 * per fragment is queued.
640 */
641 enic_queue_wq_desc_csum_l4(wq, skb,
642 pci_map_single(enic->pdev, skb->data,
643 head_len, PCI_DMA_TODEVICE),
644 head_len,
645 csum_offset,
646 hdr_len,
647 vlan_tag_insert, vlan_tag,
648 eop, loopback);
649
650 if (!eop)
651 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
652 }
653
654 static inline void enic_queue_wq_skb_tso(struct enic *enic,
655 struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
656 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
657 {
658 unsigned int frag_len_left = skb_headlen(skb);
659 unsigned int len_left = skb->len - frag_len_left;
660 unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
661 int eop = (len_left == 0);
662 unsigned int len;
663 dma_addr_t dma_addr;
664 unsigned int offset = 0;
665 skb_frag_t *frag;
666
667 /* Preload TCP csum field with IP pseudo hdr calculated
668 * with IP length set to zero. HW will later add in length
669 * to each TCP segment resulting from the TSO.
670 */
671
672 if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
673 ip_hdr(skb)->check = 0;
674 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
675 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
676 } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
677 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
678 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
679 }
680
681 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
682 * for the main skb fragment
683 */
684 while (frag_len_left) {
685 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
686 dma_addr = pci_map_single(enic->pdev, skb->data + offset,
687 len, PCI_DMA_TODEVICE);
688 enic_queue_wq_desc_tso(wq, skb,
689 dma_addr,
690 len,
691 mss, hdr_len,
692 vlan_tag_insert, vlan_tag,
693 eop && (len == frag_len_left), loopback);
694 frag_len_left -= len;
695 offset += len;
696 }
697
698 if (eop)
699 return;
700
701 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
702 * for additional data fragments
703 */
704 for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
705 len_left -= frag->size;
706 frag_len_left = frag->size;
707 offset = frag->page_offset;
708
709 while (frag_len_left) {
710 len = min(frag_len_left,
711 (unsigned int)WQ_ENET_MAX_DESC_LEN);
712 dma_addr = pci_map_page(enic->pdev, frag->page,
713 offset, len,
714 PCI_DMA_TODEVICE);
715 enic_queue_wq_desc_cont(wq, skb,
716 dma_addr,
717 len,
718 (len_left == 0) &&
719 (len == frag_len_left), /* EOP? */
720 loopback);
721 frag_len_left -= len;
722 offset += len;
723 }
724 }
725 }
726
727 static inline void enic_queue_wq_skb(struct enic *enic,
728 struct vnic_wq *wq, struct sk_buff *skb)
729 {
730 unsigned int mss = skb_shinfo(skb)->gso_size;
731 unsigned int vlan_tag = 0;
732 int vlan_tag_insert = 0;
733 int loopback = 0;
734
735 if (vlan_tx_tag_present(skb)) {
736 /* VLAN tag from trunking driver */
737 vlan_tag_insert = 1;
738 vlan_tag = vlan_tx_tag_get(skb);
739 } else if (enic->loop_enable) {
740 vlan_tag = enic->loop_tag;
741 loopback = 1;
742 }
743
744 if (mss)
745 enic_queue_wq_skb_tso(enic, wq, skb, mss,
746 vlan_tag_insert, vlan_tag, loopback);
747 else if (skb->ip_summed == CHECKSUM_PARTIAL)
748 enic_queue_wq_skb_csum_l4(enic, wq, skb,
749 vlan_tag_insert, vlan_tag, loopback);
750 else
751 enic_queue_wq_skb_vlan(enic, wq, skb,
752 vlan_tag_insert, vlan_tag, loopback);
753 }
754
755 /* netif_tx_lock held, process context with BHs disabled, or BH */
756 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
757 struct net_device *netdev)
758 {
759 struct enic *enic = netdev_priv(netdev);
760 struct vnic_wq *wq = &enic->wq[0];
761 unsigned long flags;
762
763 if (skb->len <= 0) {
764 dev_kfree_skb(skb);
765 return NETDEV_TX_OK;
766 }
767
768 /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
769 * which is very likely. In the off chance it's going to take
770 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
771 */
772
773 if (skb_shinfo(skb)->gso_size == 0 &&
774 skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
775 skb_linearize(skb)) {
776 dev_kfree_skb(skb);
777 return NETDEV_TX_OK;
778 }
779
780 spin_lock_irqsave(&enic->wq_lock[0], flags);
781
782 if (vnic_wq_desc_avail(wq) <
783 skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
784 netif_stop_queue(netdev);
785 /* This is a hard error, log it */
786 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
787 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
788 return NETDEV_TX_BUSY;
789 }
790
791 enic_queue_wq_skb(enic, wq, skb);
792
793 if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
794 netif_stop_queue(netdev);
795
796 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
797
798 return NETDEV_TX_OK;
799 }
800
801 /* dev_base_lock rwlock held, nominally process context */
802 static struct rtnl_link_stats64 *enic_get_stats(struct net_device *netdev,
803 struct rtnl_link_stats64 *net_stats)
804 {
805 struct enic *enic = netdev_priv(netdev);
806 struct vnic_stats *stats;
807
808 enic_dev_stats_dump(enic, &stats);
809
810 net_stats->tx_packets = stats->tx.tx_frames_ok;
811 net_stats->tx_bytes = stats->tx.tx_bytes_ok;
812 net_stats->tx_errors = stats->tx.tx_errors;
813 net_stats->tx_dropped = stats->tx.tx_drops;
814
815 net_stats->rx_packets = stats->rx.rx_frames_ok;
816 net_stats->rx_bytes = stats->rx.rx_bytes_ok;
817 net_stats->rx_errors = stats->rx.rx_errors;
818 net_stats->multicast = stats->rx.rx_multicast_frames_ok;
819 net_stats->rx_over_errors = enic->rq_truncated_pkts;
820 net_stats->rx_crc_errors = enic->rq_bad_fcs;
821 net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
822
823 return net_stats;
824 }
825
826 void enic_reset_addr_lists(struct enic *enic)
827 {
828 enic->mc_count = 0;
829 enic->uc_count = 0;
830 enic->flags = 0;
831 }
832
833 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
834 {
835 struct enic *enic = netdev_priv(netdev);
836
837 if (enic_is_dynamic(enic)) {
838 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
839 return -EADDRNOTAVAIL;
840 } else {
841 if (!is_valid_ether_addr(addr))
842 return -EADDRNOTAVAIL;
843 }
844
845 memcpy(netdev->dev_addr, addr, netdev->addr_len);
846
847 return 0;
848 }
849
850 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
851 {
852 struct enic *enic = netdev_priv(netdev);
853 struct sockaddr *saddr = p;
854 char *addr = saddr->sa_data;
855 int err;
856
857 if (netif_running(enic->netdev)) {
858 err = enic_dev_del_station_addr(enic);
859 if (err)
860 return err;
861 }
862
863 err = enic_set_mac_addr(netdev, addr);
864 if (err)
865 return err;
866
867 if (netif_running(enic->netdev)) {
868 err = enic_dev_add_station_addr(enic);
869 if (err)
870 return err;
871 }
872
873 return err;
874 }
875
876 static int enic_set_mac_address(struct net_device *netdev, void *p)
877 {
878 struct sockaddr *saddr = p;
879 char *addr = saddr->sa_data;
880 struct enic *enic = netdev_priv(netdev);
881 int err;
882
883 err = enic_dev_del_station_addr(enic);
884 if (err)
885 return err;
886
887 err = enic_set_mac_addr(netdev, addr);
888 if (err)
889 return err;
890
891 return enic_dev_add_station_addr(enic);
892 }
893
894 static void enic_update_multicast_addr_list(struct enic *enic)
895 {
896 struct net_device *netdev = enic->netdev;
897 struct netdev_hw_addr *ha;
898 unsigned int mc_count = netdev_mc_count(netdev);
899 u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
900 unsigned int i, j;
901
902 if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS) {
903 netdev_warn(netdev, "Registering only %d out of %d "
904 "multicast addresses\n",
905 ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
906 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
907 }
908
909 /* Is there an easier way? Trying to minimize to
910 * calls to add/del multicast addrs. We keep the
911 * addrs from the last call in enic->mc_addr and
912 * look for changes to add/del.
913 */
914
915 i = 0;
916 netdev_for_each_mc_addr(ha, netdev) {
917 if (i == mc_count)
918 break;
919 memcpy(mc_addr[i++], ha->addr, ETH_ALEN);
920 }
921
922 for (i = 0; i < enic->mc_count; i++) {
923 for (j = 0; j < mc_count; j++)
924 if (compare_ether_addr(enic->mc_addr[i],
925 mc_addr[j]) == 0)
926 break;
927 if (j == mc_count)
928 enic_dev_del_addr(enic, enic->mc_addr[i]);
929 }
930
931 for (i = 0; i < mc_count; i++) {
932 for (j = 0; j < enic->mc_count; j++)
933 if (compare_ether_addr(mc_addr[i],
934 enic->mc_addr[j]) == 0)
935 break;
936 if (j == enic->mc_count)
937 enic_dev_add_addr(enic, mc_addr[i]);
938 }
939
940 /* Save the list to compare against next time
941 */
942
943 for (i = 0; i < mc_count; i++)
944 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
945
946 enic->mc_count = mc_count;
947 }
948
949 static void enic_update_unicast_addr_list(struct enic *enic)
950 {
951 struct net_device *netdev = enic->netdev;
952 struct netdev_hw_addr *ha;
953 unsigned int uc_count = netdev_uc_count(netdev);
954 u8 uc_addr[ENIC_UNICAST_PERFECT_FILTERS][ETH_ALEN];
955 unsigned int i, j;
956
957 if (uc_count > ENIC_UNICAST_PERFECT_FILTERS) {
958 netdev_warn(netdev, "Registering only %d out of %d "
959 "unicast addresses\n",
960 ENIC_UNICAST_PERFECT_FILTERS, uc_count);
961 uc_count = ENIC_UNICAST_PERFECT_FILTERS;
962 }
963
964 /* Is there an easier way? Trying to minimize to
965 * calls to add/del unicast addrs. We keep the
966 * addrs from the last call in enic->uc_addr and
967 * look for changes to add/del.
968 */
969
970 i = 0;
971 netdev_for_each_uc_addr(ha, netdev) {
972 if (i == uc_count)
973 break;
974 memcpy(uc_addr[i++], ha->addr, ETH_ALEN);
975 }
976
977 for (i = 0; i < enic->uc_count; i++) {
978 for (j = 0; j < uc_count; j++)
979 if (compare_ether_addr(enic->uc_addr[i],
980 uc_addr[j]) == 0)
981 break;
982 if (j == uc_count)
983 enic_dev_del_addr(enic, enic->uc_addr[i]);
984 }
985
986 for (i = 0; i < uc_count; i++) {
987 for (j = 0; j < enic->uc_count; j++)
988 if (compare_ether_addr(uc_addr[i],
989 enic->uc_addr[j]) == 0)
990 break;
991 if (j == enic->uc_count)
992 enic_dev_add_addr(enic, uc_addr[i]);
993 }
994
995 /* Save the list to compare against next time
996 */
997
998 for (i = 0; i < uc_count; i++)
999 memcpy(enic->uc_addr[i], uc_addr[i], ETH_ALEN);
1000
1001 enic->uc_count = uc_count;
1002 }
1003
1004 /* netif_tx_lock held, BHs disabled */
1005 static void enic_set_rx_mode(struct net_device *netdev)
1006 {
1007 struct enic *enic = netdev_priv(netdev);
1008 int directed = 1;
1009 int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
1010 int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
1011 int promisc = (netdev->flags & IFF_PROMISC) ||
1012 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
1013 int allmulti = (netdev->flags & IFF_ALLMULTI) ||
1014 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
1015 unsigned int flags = netdev->flags |
1016 (allmulti ? IFF_ALLMULTI : 0) |
1017 (promisc ? IFF_PROMISC : 0);
1018
1019 if (enic->flags != flags) {
1020 enic->flags = flags;
1021 enic_dev_packet_filter(enic, directed,
1022 multicast, broadcast, promisc, allmulti);
1023 }
1024
1025 if (!promisc) {
1026 enic_update_unicast_addr_list(enic);
1027 if (!allmulti)
1028 enic_update_multicast_addr_list(enic);
1029 }
1030 }
1031
1032 /* netif_tx_lock held, BHs disabled */
1033 static void enic_tx_timeout(struct net_device *netdev)
1034 {
1035 struct enic *enic = netdev_priv(netdev);
1036 schedule_work(&enic->reset);
1037 }
1038
1039 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
1040 {
1041 struct enic *enic = netdev_priv(netdev);
1042
1043 if (vf != PORT_SELF_VF)
1044 return -EOPNOTSUPP;
1045
1046 /* Ignore the vf argument for now. We can assume the request
1047 * is coming on a vf.
1048 */
1049 if (is_valid_ether_addr(mac)) {
1050 memcpy(enic->pp.vf_mac, mac, ETH_ALEN);
1051 return 0;
1052 } else
1053 return -EINVAL;
1054 }
1055
1056 static int enic_set_vf_port(struct net_device *netdev, int vf,
1057 struct nlattr *port[])
1058 {
1059 struct enic *enic = netdev_priv(netdev);
1060 struct enic_port_profile prev_pp;
1061 int err = 0, restore_pp = 1;
1062
1063 /* don't support VFs, yet */
1064 if (vf != PORT_SELF_VF)
1065 return -EOPNOTSUPP;
1066
1067 if (!port[IFLA_PORT_REQUEST])
1068 return -EOPNOTSUPP;
1069
1070 memcpy(&prev_pp, &enic->pp, sizeof(enic->pp));
1071 memset(&enic->pp, 0, sizeof(enic->pp));
1072
1073 enic->pp.set |= ENIC_SET_REQUEST;
1074 enic->pp.request = nla_get_u8(port[IFLA_PORT_REQUEST]);
1075
1076 if (port[IFLA_PORT_PROFILE]) {
1077 enic->pp.set |= ENIC_SET_NAME;
1078 memcpy(enic->pp.name, nla_data(port[IFLA_PORT_PROFILE]),
1079 PORT_PROFILE_MAX);
1080 }
1081
1082 if (port[IFLA_PORT_INSTANCE_UUID]) {
1083 enic->pp.set |= ENIC_SET_INSTANCE;
1084 memcpy(enic->pp.instance_uuid,
1085 nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
1086 }
1087
1088 if (port[IFLA_PORT_HOST_UUID]) {
1089 enic->pp.set |= ENIC_SET_HOST;
1090 memcpy(enic->pp.host_uuid,
1091 nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
1092 }
1093
1094 /* Special case handling: mac came from IFLA_VF_MAC */
1095 if (!is_zero_ether_addr(prev_pp.vf_mac))
1096 memcpy(enic->pp.mac_addr, prev_pp.vf_mac, ETH_ALEN);
1097
1098 if (is_zero_ether_addr(netdev->dev_addr))
1099 random_ether_addr(netdev->dev_addr);
1100
1101 err = enic_process_set_pp_request(enic, &prev_pp, &restore_pp);
1102 if (err) {
1103 if (restore_pp) {
1104 /* Things are still the way they were: Implicit
1105 * DISASSOCIATE failed
1106 */
1107 memcpy(&enic->pp, &prev_pp, sizeof(enic->pp));
1108 } else {
1109 memset(&enic->pp, 0, sizeof(enic->pp));
1110 memset(netdev->dev_addr, 0, ETH_ALEN);
1111 }
1112 } else {
1113 /* Set flag to indicate that the port assoc/disassoc
1114 * request has been sent out to fw
1115 */
1116 enic->pp.set |= ENIC_PORT_REQUEST_APPLIED;
1117
1118 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
1119 if (enic->pp.request == PORT_REQUEST_DISASSOCIATE) {
1120 memset(enic->pp.mac_addr, 0, ETH_ALEN);
1121 memset(netdev->dev_addr, 0, ETH_ALEN);
1122 }
1123 }
1124
1125 memset(enic->pp.vf_mac, 0, ETH_ALEN);
1126
1127 return err;
1128 }
1129
1130 static int enic_get_vf_port(struct net_device *netdev, int vf,
1131 struct sk_buff *skb)
1132 {
1133 struct enic *enic = netdev_priv(netdev);
1134 u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
1135 int err;
1136
1137 if (!(enic->pp.set & ENIC_PORT_REQUEST_APPLIED))
1138 return -ENODATA;
1139
1140 err = enic_process_get_pp_request(enic, enic->pp.request, &response);
1141 if (err)
1142 return err;
1143
1144 NLA_PUT_U16(skb, IFLA_PORT_REQUEST, enic->pp.request);
1145 NLA_PUT_U16(skb, IFLA_PORT_RESPONSE, response);
1146 if (enic->pp.set & ENIC_SET_NAME)
1147 NLA_PUT(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX,
1148 enic->pp.name);
1149 if (enic->pp.set & ENIC_SET_INSTANCE)
1150 NLA_PUT(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
1151 enic->pp.instance_uuid);
1152 if (enic->pp.set & ENIC_SET_HOST)
1153 NLA_PUT(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX,
1154 enic->pp.host_uuid);
1155
1156 return 0;
1157
1158 nla_put_failure:
1159 return -EMSGSIZE;
1160 }
1161
1162 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1163 {
1164 struct enic *enic = vnic_dev_priv(rq->vdev);
1165
1166 if (!buf->os_buf)
1167 return;
1168
1169 pci_unmap_single(enic->pdev, buf->dma_addr,
1170 buf->len, PCI_DMA_FROMDEVICE);
1171 dev_kfree_skb_any(buf->os_buf);
1172 }
1173
1174 static int enic_rq_alloc_buf(struct vnic_rq *rq)
1175 {
1176 struct enic *enic = vnic_dev_priv(rq->vdev);
1177 struct net_device *netdev = enic->netdev;
1178 struct sk_buff *skb;
1179 unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
1180 unsigned int os_buf_index = 0;
1181 dma_addr_t dma_addr;
1182
1183 skb = netdev_alloc_skb_ip_align(netdev, len);
1184 if (!skb)
1185 return -ENOMEM;
1186
1187 dma_addr = pci_map_single(enic->pdev, skb->data,
1188 len, PCI_DMA_FROMDEVICE);
1189
1190 enic_queue_rq_desc(rq, skb, os_buf_index,
1191 dma_addr, len);
1192
1193 return 0;
1194 }
1195
1196 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1197 struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1198 int skipped, void *opaque)
1199 {
1200 struct enic *enic = vnic_dev_priv(rq->vdev);
1201 struct net_device *netdev = enic->netdev;
1202 struct sk_buff *skb;
1203
1204 u8 type, color, eop, sop, ingress_port, vlan_stripped;
1205 u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1206 u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1207 u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1208 u8 packet_error;
1209 u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1210 u32 rss_hash;
1211
1212 if (skipped)
1213 return;
1214
1215 skb = buf->os_buf;
1216 prefetch(skb->data - NET_IP_ALIGN);
1217 pci_unmap_single(enic->pdev, buf->dma_addr,
1218 buf->len, PCI_DMA_FROMDEVICE);
1219
1220 cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1221 &type, &color, &q_number, &completed_index,
1222 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1223 &csum_not_calc, &rss_hash, &bytes_written,
1224 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1225 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1226 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1227 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1228 &fcs_ok);
1229
1230 if (packet_error) {
1231
1232 if (!fcs_ok) {
1233 if (bytes_written > 0)
1234 enic->rq_bad_fcs++;
1235 else if (bytes_written == 0)
1236 enic->rq_truncated_pkts++;
1237 }
1238
1239 dev_kfree_skb_any(skb);
1240
1241 return;
1242 }
1243
1244 if (eop && bytes_written > 0) {
1245
1246 /* Good receive
1247 */
1248
1249 skb_put(skb, bytes_written);
1250 skb->protocol = eth_type_trans(skb, netdev);
1251
1252 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc) {
1253 skb->csum = htons(checksum);
1254 skb->ip_summed = CHECKSUM_COMPLETE;
1255 }
1256
1257 skb->dev = netdev;
1258
1259 if (vlan_stripped)
1260 __vlan_hwaccel_put_tag(skb, vlan_tci);
1261
1262 if (netdev->features & NETIF_F_GRO)
1263 napi_gro_receive(&enic->napi[q_number], skb);
1264 else
1265 netif_receive_skb(skb);
1266 } else {
1267
1268 /* Buffer overflow
1269 */
1270
1271 dev_kfree_skb_any(skb);
1272 }
1273 }
1274
1275 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1276 u8 type, u16 q_number, u16 completed_index, void *opaque)
1277 {
1278 struct enic *enic = vnic_dev_priv(vdev);
1279
1280 vnic_rq_service(&enic->rq[q_number], cq_desc,
1281 completed_index, VNIC_RQ_RETURN_DESC,
1282 enic_rq_indicate_buf, opaque);
1283
1284 return 0;
1285 }
1286
1287 static int enic_poll(struct napi_struct *napi, int budget)
1288 {
1289 struct net_device *netdev = napi->dev;
1290 struct enic *enic = netdev_priv(netdev);
1291 unsigned int cq_rq = enic_cq_rq(enic, 0);
1292 unsigned int cq_wq = enic_cq_wq(enic, 0);
1293 unsigned int intr = enic_legacy_io_intr();
1294 unsigned int rq_work_to_do = budget;
1295 unsigned int wq_work_to_do = -1; /* no limit */
1296 unsigned int work_done, rq_work_done, wq_work_done;
1297 int err;
1298
1299 /* Service RQ (first) and WQ
1300 */
1301
1302 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1303 rq_work_to_do, enic_rq_service, NULL);
1304
1305 wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
1306 wq_work_to_do, enic_wq_service, NULL);
1307
1308 /* Accumulate intr event credits for this polling
1309 * cycle. An intr event is the completion of a
1310 * a WQ or RQ packet.
1311 */
1312
1313 work_done = rq_work_done + wq_work_done;
1314
1315 if (work_done > 0)
1316 vnic_intr_return_credits(&enic->intr[intr],
1317 work_done,
1318 0 /* don't unmask intr */,
1319 0 /* don't reset intr timer */);
1320
1321 err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1322
1323 /* Buffer allocation failed. Stay in polling
1324 * mode so we can try to fill the ring again.
1325 */
1326
1327 if (err)
1328 rq_work_done = rq_work_to_do;
1329
1330 if (rq_work_done < rq_work_to_do) {
1331
1332 /* Some work done, but not enough to stay in polling,
1333 * exit polling
1334 */
1335
1336 napi_complete(napi);
1337 vnic_intr_unmask(&enic->intr[intr]);
1338 }
1339
1340 return rq_work_done;
1341 }
1342
1343 static int enic_poll_msix(struct napi_struct *napi, int budget)
1344 {
1345 struct net_device *netdev = napi->dev;
1346 struct enic *enic = netdev_priv(netdev);
1347 unsigned int rq = (napi - &enic->napi[0]);
1348 unsigned int cq = enic_cq_rq(enic, rq);
1349 unsigned int intr = enic_msix_rq_intr(enic, rq);
1350 unsigned int work_to_do = budget;
1351 unsigned int work_done;
1352 int err;
1353
1354 /* Service RQ
1355 */
1356
1357 work_done = vnic_cq_service(&enic->cq[cq],
1358 work_to_do, enic_rq_service, NULL);
1359
1360 /* Return intr event credits for this polling
1361 * cycle. An intr event is the completion of a
1362 * RQ packet.
1363 */
1364
1365 if (work_done > 0)
1366 vnic_intr_return_credits(&enic->intr[intr],
1367 work_done,
1368 0 /* don't unmask intr */,
1369 0 /* don't reset intr timer */);
1370
1371 err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1372
1373 /* Buffer allocation failed. Stay in polling mode
1374 * so we can try to fill the ring again.
1375 */
1376
1377 if (err)
1378 work_done = work_to_do;
1379
1380 if (work_done < work_to_do) {
1381
1382 /* Some work done, but not enough to stay in polling,
1383 * exit polling
1384 */
1385
1386 napi_complete(napi);
1387 vnic_intr_unmask(&enic->intr[intr]);
1388 }
1389
1390 return work_done;
1391 }
1392
1393 static void enic_notify_timer(unsigned long data)
1394 {
1395 struct enic *enic = (struct enic *)data;
1396
1397 enic_notify_check(enic);
1398
1399 mod_timer(&enic->notify_timer,
1400 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1401 }
1402
1403 static void enic_free_intr(struct enic *enic)
1404 {
1405 struct net_device *netdev = enic->netdev;
1406 unsigned int i;
1407
1408 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1409 case VNIC_DEV_INTR_MODE_INTX:
1410 free_irq(enic->pdev->irq, netdev);
1411 break;
1412 case VNIC_DEV_INTR_MODE_MSI:
1413 free_irq(enic->pdev->irq, enic);
1414 break;
1415 case VNIC_DEV_INTR_MODE_MSIX:
1416 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1417 if (enic->msix[i].requested)
1418 free_irq(enic->msix_entry[i].vector,
1419 enic->msix[i].devid);
1420 break;
1421 default:
1422 break;
1423 }
1424 }
1425
1426 static int enic_request_intr(struct enic *enic)
1427 {
1428 struct net_device *netdev = enic->netdev;
1429 unsigned int i, intr;
1430 int err = 0;
1431
1432 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1433
1434 case VNIC_DEV_INTR_MODE_INTX:
1435
1436 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1437 IRQF_SHARED, netdev->name, netdev);
1438 break;
1439
1440 case VNIC_DEV_INTR_MODE_MSI:
1441
1442 err = request_irq(enic->pdev->irq, enic_isr_msi,
1443 0, netdev->name, enic);
1444 break;
1445
1446 case VNIC_DEV_INTR_MODE_MSIX:
1447
1448 for (i = 0; i < enic->rq_count; i++) {
1449 intr = enic_msix_rq_intr(enic, i);
1450 sprintf(enic->msix[intr].devname,
1451 "%.11s-rx-%d", netdev->name, i);
1452 enic->msix[intr].isr = enic_isr_msix_rq;
1453 enic->msix[intr].devid = &enic->napi[i];
1454 }
1455
1456 for (i = 0; i < enic->wq_count; i++) {
1457 intr = enic_msix_wq_intr(enic, i);
1458 sprintf(enic->msix[intr].devname,
1459 "%.11s-tx-%d", netdev->name, i);
1460 enic->msix[intr].isr = enic_isr_msix_wq;
1461 enic->msix[intr].devid = enic;
1462 }
1463
1464 intr = enic_msix_err_intr(enic);
1465 sprintf(enic->msix[intr].devname,
1466 "%.11s-err", netdev->name);
1467 enic->msix[intr].isr = enic_isr_msix_err;
1468 enic->msix[intr].devid = enic;
1469
1470 intr = enic_msix_notify_intr(enic);
1471 sprintf(enic->msix[intr].devname,
1472 "%.11s-notify", netdev->name);
1473 enic->msix[intr].isr = enic_isr_msix_notify;
1474 enic->msix[intr].devid = enic;
1475
1476 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1477 enic->msix[i].requested = 0;
1478
1479 for (i = 0; i < enic->intr_count; i++) {
1480 err = request_irq(enic->msix_entry[i].vector,
1481 enic->msix[i].isr, 0,
1482 enic->msix[i].devname,
1483 enic->msix[i].devid);
1484 if (err) {
1485 enic_free_intr(enic);
1486 break;
1487 }
1488 enic->msix[i].requested = 1;
1489 }
1490
1491 break;
1492
1493 default:
1494 break;
1495 }
1496
1497 return err;
1498 }
1499
1500 static void enic_synchronize_irqs(struct enic *enic)
1501 {
1502 unsigned int i;
1503
1504 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1505 case VNIC_DEV_INTR_MODE_INTX:
1506 case VNIC_DEV_INTR_MODE_MSI:
1507 synchronize_irq(enic->pdev->irq);
1508 break;
1509 case VNIC_DEV_INTR_MODE_MSIX:
1510 for (i = 0; i < enic->intr_count; i++)
1511 synchronize_irq(enic->msix_entry[i].vector);
1512 break;
1513 default:
1514 break;
1515 }
1516 }
1517
1518 static int enic_dev_notify_set(struct enic *enic)
1519 {
1520 int err;
1521
1522 spin_lock(&enic->devcmd_lock);
1523 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1524 case VNIC_DEV_INTR_MODE_INTX:
1525 err = vnic_dev_notify_set(enic->vdev,
1526 enic_legacy_notify_intr());
1527 break;
1528 case VNIC_DEV_INTR_MODE_MSIX:
1529 err = vnic_dev_notify_set(enic->vdev,
1530 enic_msix_notify_intr(enic));
1531 break;
1532 default:
1533 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1534 break;
1535 }
1536 spin_unlock(&enic->devcmd_lock);
1537
1538 return err;
1539 }
1540
1541 static void enic_notify_timer_start(struct enic *enic)
1542 {
1543 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1544 case VNIC_DEV_INTR_MODE_MSI:
1545 mod_timer(&enic->notify_timer, jiffies);
1546 break;
1547 default:
1548 /* Using intr for notification for INTx/MSI-X */
1549 break;
1550 }
1551 }
1552
1553 /* rtnl lock is held, process context */
1554 static int enic_open(struct net_device *netdev)
1555 {
1556 struct enic *enic = netdev_priv(netdev);
1557 unsigned int i;
1558 int err;
1559
1560 err = enic_request_intr(enic);
1561 if (err) {
1562 netdev_err(netdev, "Unable to request irq.\n");
1563 return err;
1564 }
1565
1566 err = enic_dev_notify_set(enic);
1567 if (err) {
1568 netdev_err(netdev,
1569 "Failed to alloc notify buffer, aborting.\n");
1570 goto err_out_free_intr;
1571 }
1572
1573 for (i = 0; i < enic->rq_count; i++) {
1574 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1575 /* Need at least one buffer on ring to get going */
1576 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1577 netdev_err(netdev, "Unable to alloc receive buffers\n");
1578 err = -ENOMEM;
1579 goto err_out_notify_unset;
1580 }
1581 }
1582
1583 for (i = 0; i < enic->wq_count; i++)
1584 vnic_wq_enable(&enic->wq[i]);
1585 for (i = 0; i < enic->rq_count; i++)
1586 vnic_rq_enable(&enic->rq[i]);
1587
1588 if (enic_is_dynamic(enic) && !is_zero_ether_addr(enic->pp.mac_addr))
1589 enic_dev_add_addr(enic, enic->pp.mac_addr);
1590 else
1591 enic_dev_add_station_addr(enic);
1592 enic_set_rx_mode(netdev);
1593
1594 netif_wake_queue(netdev);
1595
1596 for (i = 0; i < enic->rq_count; i++)
1597 napi_enable(&enic->napi[i]);
1598
1599 enic_dev_enable(enic);
1600
1601 for (i = 0; i < enic->intr_count; i++)
1602 vnic_intr_unmask(&enic->intr[i]);
1603
1604 enic_notify_timer_start(enic);
1605
1606 return 0;
1607
1608 err_out_notify_unset:
1609 enic_dev_notify_unset(enic);
1610 err_out_free_intr:
1611 enic_free_intr(enic);
1612
1613 return err;
1614 }
1615
1616 /* rtnl lock is held, process context */
1617 static int enic_stop(struct net_device *netdev)
1618 {
1619 struct enic *enic = netdev_priv(netdev);
1620 unsigned int i;
1621 int err;
1622
1623 for (i = 0; i < enic->intr_count; i++) {
1624 vnic_intr_mask(&enic->intr[i]);
1625 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1626 }
1627
1628 enic_synchronize_irqs(enic);
1629
1630 del_timer_sync(&enic->notify_timer);
1631
1632 enic_dev_disable(enic);
1633
1634 for (i = 0; i < enic->rq_count; i++)
1635 napi_disable(&enic->napi[i]);
1636
1637 netif_carrier_off(netdev);
1638 netif_tx_disable(netdev);
1639 if (enic_is_dynamic(enic) && !is_zero_ether_addr(enic->pp.mac_addr))
1640 enic_dev_del_addr(enic, enic->pp.mac_addr);
1641 else
1642 enic_dev_del_station_addr(enic);
1643
1644 for (i = 0; i < enic->wq_count; i++) {
1645 err = vnic_wq_disable(&enic->wq[i]);
1646 if (err)
1647 return err;
1648 }
1649 for (i = 0; i < enic->rq_count; i++) {
1650 err = vnic_rq_disable(&enic->rq[i]);
1651 if (err)
1652 return err;
1653 }
1654
1655 enic_dev_notify_unset(enic);
1656 enic_free_intr(enic);
1657
1658 for (i = 0; i < enic->wq_count; i++)
1659 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1660 for (i = 0; i < enic->rq_count; i++)
1661 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1662 for (i = 0; i < enic->cq_count; i++)
1663 vnic_cq_clean(&enic->cq[i]);
1664 for (i = 0; i < enic->intr_count; i++)
1665 vnic_intr_clean(&enic->intr[i]);
1666
1667 return 0;
1668 }
1669
1670 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1671 {
1672 struct enic *enic = netdev_priv(netdev);
1673 int running = netif_running(netdev);
1674
1675 if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1676 return -EINVAL;
1677
1678 if (enic_is_dynamic(enic))
1679 return -EOPNOTSUPP;
1680
1681 if (running)
1682 enic_stop(netdev);
1683
1684 netdev->mtu = new_mtu;
1685
1686 if (netdev->mtu > enic->port_mtu)
1687 netdev_warn(netdev,
1688 "interface MTU (%d) set higher than port MTU (%d)\n",
1689 netdev->mtu, enic->port_mtu);
1690
1691 if (running)
1692 enic_open(netdev);
1693
1694 return 0;
1695 }
1696
1697 static void enic_change_mtu_work(struct work_struct *work)
1698 {
1699 struct enic *enic = container_of(work, struct enic, change_mtu_work);
1700 struct net_device *netdev = enic->netdev;
1701 int new_mtu = vnic_dev_mtu(enic->vdev);
1702 int err;
1703 unsigned int i;
1704
1705 new_mtu = max_t(int, ENIC_MIN_MTU, min_t(int, ENIC_MAX_MTU, new_mtu));
1706
1707 rtnl_lock();
1708
1709 /* Stop RQ */
1710 del_timer_sync(&enic->notify_timer);
1711
1712 for (i = 0; i < enic->rq_count; i++)
1713 napi_disable(&enic->napi[i]);
1714
1715 vnic_intr_mask(&enic->intr[0]);
1716 enic_synchronize_irqs(enic);
1717 err = vnic_rq_disable(&enic->rq[0]);
1718 if (err) {
1719 netdev_err(netdev, "Unable to disable RQ.\n");
1720 return;
1721 }
1722 vnic_rq_clean(&enic->rq[0], enic_free_rq_buf);
1723 vnic_cq_clean(&enic->cq[0]);
1724 vnic_intr_clean(&enic->intr[0]);
1725
1726 /* Fill RQ with new_mtu-sized buffers */
1727 netdev->mtu = new_mtu;
1728 vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1729 /* Need at least one buffer on ring to get going */
1730 if (vnic_rq_desc_used(&enic->rq[0]) == 0) {
1731 netdev_err(netdev, "Unable to alloc receive buffers.\n");
1732 return;
1733 }
1734
1735 /* Start RQ */
1736 vnic_rq_enable(&enic->rq[0]);
1737 napi_enable(&enic->napi[0]);
1738 vnic_intr_unmask(&enic->intr[0]);
1739 enic_notify_timer_start(enic);
1740
1741 rtnl_unlock();
1742
1743 netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
1744 }
1745
1746 #ifdef CONFIG_NET_POLL_CONTROLLER
1747 static void enic_poll_controller(struct net_device *netdev)
1748 {
1749 struct enic *enic = netdev_priv(netdev);
1750 struct vnic_dev *vdev = enic->vdev;
1751 unsigned int i, intr;
1752
1753 switch (vnic_dev_get_intr_mode(vdev)) {
1754 case VNIC_DEV_INTR_MODE_MSIX:
1755 for (i = 0; i < enic->rq_count; i++) {
1756 intr = enic_msix_rq_intr(enic, i);
1757 enic_isr_msix_rq(enic->msix_entry[intr].vector,
1758 &enic->napi[i]);
1759 }
1760
1761 for (i = 0; i < enic->wq_count; i++) {
1762 intr = enic_msix_wq_intr(enic, i);
1763 enic_isr_msix_wq(enic->msix_entry[intr].vector, enic);
1764 }
1765
1766 break;
1767 case VNIC_DEV_INTR_MODE_MSI:
1768 enic_isr_msi(enic->pdev->irq, enic);
1769 break;
1770 case VNIC_DEV_INTR_MODE_INTX:
1771 enic_isr_legacy(enic->pdev->irq, netdev);
1772 break;
1773 default:
1774 break;
1775 }
1776 }
1777 #endif
1778
1779 static int enic_dev_wait(struct vnic_dev *vdev,
1780 int (*start)(struct vnic_dev *, int),
1781 int (*finished)(struct vnic_dev *, int *),
1782 int arg)
1783 {
1784 unsigned long time;
1785 int done;
1786 int err;
1787
1788 BUG_ON(in_interrupt());
1789
1790 err = start(vdev, arg);
1791 if (err)
1792 return err;
1793
1794 /* Wait for func to complete...2 seconds max
1795 */
1796
1797 time = jiffies + (HZ * 2);
1798 do {
1799
1800 err = finished(vdev, &done);
1801 if (err)
1802 return err;
1803
1804 if (done)
1805 return 0;
1806
1807 schedule_timeout_uninterruptible(HZ / 10);
1808
1809 } while (time_after(time, jiffies));
1810
1811 return -ETIMEDOUT;
1812 }
1813
1814 static int enic_dev_open(struct enic *enic)
1815 {
1816 int err;
1817
1818 err = enic_dev_wait(enic->vdev, vnic_dev_open,
1819 vnic_dev_open_done, 0);
1820 if (err)
1821 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1822 err);
1823
1824 return err;
1825 }
1826
1827 static int enic_dev_hang_reset(struct enic *enic)
1828 {
1829 int err;
1830
1831 err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1832 vnic_dev_hang_reset_done, 0);
1833 if (err)
1834 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1835 err);
1836
1837 return err;
1838 }
1839
1840 static int enic_set_rsskey(struct enic *enic)
1841 {
1842 dma_addr_t rss_key_buf_pa;
1843 union vnic_rss_key *rss_key_buf_va = NULL;
1844 union vnic_rss_key rss_key = {
1845 .key[0].b = {85, 67, 83, 97, 119, 101, 115, 111, 109, 101},
1846 .key[1].b = {80, 65, 76, 79, 117, 110, 105, 113, 117, 101},
1847 .key[2].b = {76, 73, 78, 85, 88, 114, 111, 99, 107, 115},
1848 .key[3].b = {69, 78, 73, 67, 105, 115, 99, 111, 111, 108},
1849 };
1850 int err;
1851
1852 rss_key_buf_va = pci_alloc_consistent(enic->pdev,
1853 sizeof(union vnic_rss_key), &rss_key_buf_pa);
1854 if (!rss_key_buf_va)
1855 return -ENOMEM;
1856
1857 memcpy(rss_key_buf_va, &rss_key, sizeof(union vnic_rss_key));
1858
1859 spin_lock(&enic->devcmd_lock);
1860 err = enic_set_rss_key(enic,
1861 rss_key_buf_pa,
1862 sizeof(union vnic_rss_key));
1863 spin_unlock(&enic->devcmd_lock);
1864
1865 pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1866 rss_key_buf_va, rss_key_buf_pa);
1867
1868 return err;
1869 }
1870
1871 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1872 {
1873 dma_addr_t rss_cpu_buf_pa;
1874 union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1875 unsigned int i;
1876 int err;
1877
1878 rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1879 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1880 if (!rss_cpu_buf_va)
1881 return -ENOMEM;
1882
1883 for (i = 0; i < (1 << rss_hash_bits); i++)
1884 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1885
1886 spin_lock(&enic->devcmd_lock);
1887 err = enic_set_rss_cpu(enic,
1888 rss_cpu_buf_pa,
1889 sizeof(union vnic_rss_cpu));
1890 spin_unlock(&enic->devcmd_lock);
1891
1892 pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1893 rss_cpu_buf_va, rss_cpu_buf_pa);
1894
1895 return err;
1896 }
1897
1898 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
1899 u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
1900 {
1901 const u8 tso_ipid_split_en = 0;
1902 const u8 ig_vlan_strip_en = 1;
1903 int err;
1904
1905 /* Enable VLAN tag stripping.
1906 */
1907
1908 spin_lock(&enic->devcmd_lock);
1909 err = enic_set_nic_cfg(enic,
1910 rss_default_cpu, rss_hash_type,
1911 rss_hash_bits, rss_base_cpu,
1912 rss_enable, tso_ipid_split_en,
1913 ig_vlan_strip_en);
1914 spin_unlock(&enic->devcmd_lock);
1915
1916 return err;
1917 }
1918
1919 static int enic_set_rss_nic_cfg(struct enic *enic)
1920 {
1921 struct device *dev = enic_get_dev(enic);
1922 const u8 rss_default_cpu = 0;
1923 const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
1924 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
1925 NIC_CFG_RSS_HASH_TYPE_IPV6 |
1926 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
1927 const u8 rss_hash_bits = 7;
1928 const u8 rss_base_cpu = 0;
1929 u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
1930
1931 if (rss_enable) {
1932 if (!enic_set_rsskey(enic)) {
1933 if (enic_set_rsscpu(enic, rss_hash_bits)) {
1934 rss_enable = 0;
1935 dev_warn(dev, "RSS disabled, "
1936 "Failed to set RSS cpu indirection table.");
1937 }
1938 } else {
1939 rss_enable = 0;
1940 dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
1941 }
1942 }
1943
1944 return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
1945 rss_hash_bits, rss_base_cpu, rss_enable);
1946 }
1947
1948 static void enic_reset(struct work_struct *work)
1949 {
1950 struct enic *enic = container_of(work, struct enic, reset);
1951
1952 if (!netif_running(enic->netdev))
1953 return;
1954
1955 rtnl_lock();
1956
1957 enic_dev_hang_notify(enic);
1958 enic_stop(enic->netdev);
1959 enic_dev_hang_reset(enic);
1960 enic_reset_addr_lists(enic);
1961 enic_init_vnic_resources(enic);
1962 enic_set_rss_nic_cfg(enic);
1963 enic_dev_set_ig_vlan_rewrite_mode(enic);
1964 enic_open(enic->netdev);
1965
1966 rtnl_unlock();
1967 }
1968
1969 static int enic_set_intr_mode(struct enic *enic)
1970 {
1971 unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
1972 unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
1973 unsigned int i;
1974
1975 /* Set interrupt mode (INTx, MSI, MSI-X) depending
1976 * on system capabilities.
1977 *
1978 * Try MSI-X first
1979 *
1980 * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1981 * (the second to last INTR is used for WQ/RQ errors)
1982 * (the last INTR is used for notifications)
1983 */
1984
1985 BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1986 for (i = 0; i < n + m + 2; i++)
1987 enic->msix_entry[i].entry = i;
1988
1989 /* Use multiple RQs if RSS is enabled
1990 */
1991
1992 if (ENIC_SETTING(enic, RSS) &&
1993 enic->config.intr_mode < 1 &&
1994 enic->rq_count >= n &&
1995 enic->wq_count >= m &&
1996 enic->cq_count >= n + m &&
1997 enic->intr_count >= n + m + 2) {
1998
1999 if (!pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {
2000
2001 enic->rq_count = n;
2002 enic->wq_count = m;
2003 enic->cq_count = n + m;
2004 enic->intr_count = n + m + 2;
2005
2006 vnic_dev_set_intr_mode(enic->vdev,
2007 VNIC_DEV_INTR_MODE_MSIX);
2008
2009 return 0;
2010 }
2011 }
2012
2013 if (enic->config.intr_mode < 1 &&
2014 enic->rq_count >= 1 &&
2015 enic->wq_count >= m &&
2016 enic->cq_count >= 1 + m &&
2017 enic->intr_count >= 1 + m + 2) {
2018 if (!pci_enable_msix(enic->pdev, enic->msix_entry, 1 + m + 2)) {
2019
2020 enic->rq_count = 1;
2021 enic->wq_count = m;
2022 enic->cq_count = 1 + m;
2023 enic->intr_count = 1 + m + 2;
2024
2025 vnic_dev_set_intr_mode(enic->vdev,
2026 VNIC_DEV_INTR_MODE_MSIX);
2027
2028 return 0;
2029 }
2030 }
2031
2032 /* Next try MSI
2033 *
2034 * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2035 */
2036
2037 if (enic->config.intr_mode < 2 &&
2038 enic->rq_count >= 1 &&
2039 enic->wq_count >= 1 &&
2040 enic->cq_count >= 2 &&
2041 enic->intr_count >= 1 &&
2042 !pci_enable_msi(enic->pdev)) {
2043
2044 enic->rq_count = 1;
2045 enic->wq_count = 1;
2046 enic->cq_count = 2;
2047 enic->intr_count = 1;
2048
2049 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2050
2051 return 0;
2052 }
2053
2054 /* Next try INTx
2055 *
2056 * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2057 * (the first INTR is used for WQ/RQ)
2058 * (the second INTR is used for WQ/RQ errors)
2059 * (the last INTR is used for notifications)
2060 */
2061
2062 if (enic->config.intr_mode < 3 &&
2063 enic->rq_count >= 1 &&
2064 enic->wq_count >= 1 &&
2065 enic->cq_count >= 2 &&
2066 enic->intr_count >= 3) {
2067
2068 enic->rq_count = 1;
2069 enic->wq_count = 1;
2070 enic->cq_count = 2;
2071 enic->intr_count = 3;
2072
2073 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2074
2075 return 0;
2076 }
2077
2078 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2079
2080 return -EINVAL;
2081 }
2082
2083 static void enic_clear_intr_mode(struct enic *enic)
2084 {
2085 switch (vnic_dev_get_intr_mode(enic->vdev)) {
2086 case VNIC_DEV_INTR_MODE_MSIX:
2087 pci_disable_msix(enic->pdev);
2088 break;
2089 case VNIC_DEV_INTR_MODE_MSI:
2090 pci_disable_msi(enic->pdev);
2091 break;
2092 default:
2093 break;
2094 }
2095
2096 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2097 }
2098
2099 static const struct net_device_ops enic_netdev_dynamic_ops = {
2100 .ndo_open = enic_open,
2101 .ndo_stop = enic_stop,
2102 .ndo_start_xmit = enic_hard_start_xmit,
2103 .ndo_get_stats64 = enic_get_stats,
2104 .ndo_validate_addr = eth_validate_addr,
2105 .ndo_set_rx_mode = enic_set_rx_mode,
2106 .ndo_set_multicast_list = enic_set_rx_mode,
2107 .ndo_set_mac_address = enic_set_mac_address_dynamic,
2108 .ndo_change_mtu = enic_change_mtu,
2109 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid,
2110 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid,
2111 .ndo_tx_timeout = enic_tx_timeout,
2112 .ndo_set_vf_port = enic_set_vf_port,
2113 .ndo_get_vf_port = enic_get_vf_port,
2114 .ndo_set_vf_mac = enic_set_vf_mac,
2115 #ifdef CONFIG_NET_POLL_CONTROLLER
2116 .ndo_poll_controller = enic_poll_controller,
2117 #endif
2118 };
2119
2120 static const struct net_device_ops enic_netdev_ops = {
2121 .ndo_open = enic_open,
2122 .ndo_stop = enic_stop,
2123 .ndo_start_xmit = enic_hard_start_xmit,
2124 .ndo_get_stats64 = enic_get_stats,
2125 .ndo_validate_addr = eth_validate_addr,
2126 .ndo_set_mac_address = enic_set_mac_address,
2127 .ndo_set_rx_mode = enic_set_rx_mode,
2128 .ndo_set_multicast_list = enic_set_rx_mode,
2129 .ndo_change_mtu = enic_change_mtu,
2130 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid,
2131 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid,
2132 .ndo_tx_timeout = enic_tx_timeout,
2133 #ifdef CONFIG_NET_POLL_CONTROLLER
2134 .ndo_poll_controller = enic_poll_controller,
2135 #endif
2136 };
2137
2138 static void enic_dev_deinit(struct enic *enic)
2139 {
2140 unsigned int i;
2141
2142 for (i = 0; i < enic->rq_count; i++)
2143 netif_napi_del(&enic->napi[i]);
2144
2145 enic_free_vnic_resources(enic);
2146 enic_clear_intr_mode(enic);
2147 }
2148
2149 static int enic_dev_init(struct enic *enic)
2150 {
2151 struct device *dev = enic_get_dev(enic);
2152 struct net_device *netdev = enic->netdev;
2153 unsigned int i;
2154 int err;
2155
2156 /* Get interrupt coalesce timer info */
2157 err = enic_dev_intr_coal_timer_info(enic);
2158 if (err) {
2159 dev_warn(dev, "Using default conversion factor for "
2160 "interrupt coalesce timer\n");
2161 vnic_dev_intr_coal_timer_info_default(enic->vdev);
2162 }
2163
2164 /* Get vNIC configuration
2165 */
2166
2167 err = enic_get_vnic_config(enic);
2168 if (err) {
2169 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2170 return err;
2171 }
2172
2173 /* Get available resource counts
2174 */
2175
2176 enic_get_res_counts(enic);
2177
2178 /* Set interrupt mode based on resource counts and system
2179 * capabilities
2180 */
2181
2182 err = enic_set_intr_mode(enic);
2183 if (err) {
2184 dev_err(dev, "Failed to set intr mode based on resource "
2185 "counts and system capabilities, aborting\n");
2186 return err;
2187 }
2188
2189 /* Allocate and configure vNIC resources
2190 */
2191
2192 err = enic_alloc_vnic_resources(enic);
2193 if (err) {
2194 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2195 goto err_out_free_vnic_resources;
2196 }
2197
2198 enic_init_vnic_resources(enic);
2199
2200 err = enic_set_rss_nic_cfg(enic);
2201 if (err) {
2202 dev_err(dev, "Failed to config nic, aborting\n");
2203 goto err_out_free_vnic_resources;
2204 }
2205
2206 switch (vnic_dev_get_intr_mode(enic->vdev)) {
2207 default:
2208 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2209 break;
2210 case VNIC_DEV_INTR_MODE_MSIX:
2211 for (i = 0; i < enic->rq_count; i++)
2212 netif_napi_add(netdev, &enic->napi[i],
2213 enic_poll_msix, 64);
2214 break;
2215 }
2216
2217 return 0;
2218
2219 err_out_free_vnic_resources:
2220 enic_clear_intr_mode(enic);
2221 enic_free_vnic_resources(enic);
2222
2223 return err;
2224 }
2225
2226 static void enic_iounmap(struct enic *enic)
2227 {
2228 unsigned int i;
2229
2230 for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2231 if (enic->bar[i].vaddr)
2232 iounmap(enic->bar[i].vaddr);
2233 }
2234
2235 static int __devinit enic_probe(struct pci_dev *pdev,
2236 const struct pci_device_id *ent)
2237 {
2238 struct device *dev = &pdev->dev;
2239 struct net_device *netdev;
2240 struct enic *enic;
2241 int using_dac = 0;
2242 unsigned int i;
2243 int err;
2244
2245 /* Allocate net device structure and initialize. Private
2246 * instance data is initialized to zero.
2247 */
2248
2249 netdev = alloc_etherdev(sizeof(struct enic));
2250 if (!netdev) {
2251 pr_err("Etherdev alloc failed, aborting\n");
2252 return -ENOMEM;
2253 }
2254
2255 pci_set_drvdata(pdev, netdev);
2256
2257 SET_NETDEV_DEV(netdev, &pdev->dev);
2258
2259 enic = netdev_priv(netdev);
2260 enic->netdev = netdev;
2261 enic->pdev = pdev;
2262
2263 /* Setup PCI resources
2264 */
2265
2266 err = pci_enable_device_mem(pdev);
2267 if (err) {
2268 dev_err(dev, "Cannot enable PCI device, aborting\n");
2269 goto err_out_free_netdev;
2270 }
2271
2272 err = pci_request_regions(pdev, DRV_NAME);
2273 if (err) {
2274 dev_err(dev, "Cannot request PCI regions, aborting\n");
2275 goto err_out_disable_device;
2276 }
2277
2278 pci_set_master(pdev);
2279
2280 /* Query PCI controller on system for DMA addressing
2281 * limitation for the device. Try 40-bit first, and
2282 * fail to 32-bit.
2283 */
2284
2285 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40));
2286 if (err) {
2287 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2288 if (err) {
2289 dev_err(dev, "No usable DMA configuration, aborting\n");
2290 goto err_out_release_regions;
2291 }
2292 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2293 if (err) {
2294 dev_err(dev, "Unable to obtain %u-bit DMA "
2295 "for consistent allocations, aborting\n", 32);
2296 goto err_out_release_regions;
2297 }
2298 } else {
2299 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40));
2300 if (err) {
2301 dev_err(dev, "Unable to obtain %u-bit DMA "
2302 "for consistent allocations, aborting\n", 40);
2303 goto err_out_release_regions;
2304 }
2305 using_dac = 1;
2306 }
2307
2308 /* Map vNIC resources from BAR0-5
2309 */
2310
2311 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2312 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2313 continue;
2314 enic->bar[i].len = pci_resource_len(pdev, i);
2315 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2316 if (!enic->bar[i].vaddr) {
2317 dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2318 err = -ENODEV;
2319 goto err_out_iounmap;
2320 }
2321 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2322 }
2323
2324 /* Register vNIC device
2325 */
2326
2327 enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2328 ARRAY_SIZE(enic->bar));
2329 if (!enic->vdev) {
2330 dev_err(dev, "vNIC registration failed, aborting\n");
2331 err = -ENODEV;
2332 goto err_out_iounmap;
2333 }
2334
2335 /* Issue device open to get device in known state
2336 */
2337
2338 err = enic_dev_open(enic);
2339 if (err) {
2340 dev_err(dev, "vNIC dev open failed, aborting\n");
2341 goto err_out_vnic_unregister;
2342 }
2343
2344 /* Setup devcmd lock
2345 */
2346
2347 spin_lock_init(&enic->devcmd_lock);
2348
2349 /*
2350 * Set ingress vlan rewrite mode before vnic initialization
2351 */
2352
2353 err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2354 if (err) {
2355 dev_err(dev,
2356 "Failed to set ingress vlan rewrite mode, aborting.\n");
2357 goto err_out_dev_close;
2358 }
2359
2360 /* Issue device init to initialize the vnic-to-switch link.
2361 * We'll start with carrier off and wait for link UP
2362 * notification later to turn on carrier. We don't need
2363 * to wait here for the vnic-to-switch link initialization
2364 * to complete; link UP notification is the indication that
2365 * the process is complete.
2366 */
2367
2368 netif_carrier_off(netdev);
2369
2370 /* Do not call dev_init for a dynamic vnic.
2371 * For a dynamic vnic, init_prov_info will be
2372 * called later by an upper layer.
2373 */
2374
2375 if (!enic_is_dynamic(enic)) {
2376 err = vnic_dev_init(enic->vdev, 0);
2377 if (err) {
2378 dev_err(dev, "vNIC dev init failed, aborting\n");
2379 goto err_out_dev_close;
2380 }
2381 }
2382
2383 err = enic_dev_init(enic);
2384 if (err) {
2385 dev_err(dev, "Device initialization failed, aborting\n");
2386 goto err_out_dev_close;
2387 }
2388
2389 /* Setup notification timer, HW reset task, and wq locks
2390 */
2391
2392 init_timer(&enic->notify_timer);
2393 enic->notify_timer.function = enic_notify_timer;
2394 enic->notify_timer.data = (unsigned long)enic;
2395
2396 INIT_WORK(&enic->reset, enic_reset);
2397 INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2398
2399 for (i = 0; i < enic->wq_count; i++)
2400 spin_lock_init(&enic->wq_lock[i]);
2401
2402 /* Register net device
2403 */
2404
2405 enic->port_mtu = enic->config.mtu;
2406 (void)enic_change_mtu(netdev, enic->port_mtu);
2407
2408 err = enic_set_mac_addr(netdev, enic->mac_addr);
2409 if (err) {
2410 dev_err(dev, "Invalid MAC address, aborting\n");
2411 goto err_out_dev_deinit;
2412 }
2413
2414 enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2415 enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2416
2417 if (enic_is_dynamic(enic))
2418 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2419 else
2420 netdev->netdev_ops = &enic_netdev_ops;
2421
2422 netdev->watchdog_timeo = 2 * HZ;
2423 netdev->ethtool_ops = &enic_ethtool_ops;
2424
2425 netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
2426 if (ENIC_SETTING(enic, LOOP)) {
2427 netdev->features &= ~NETIF_F_HW_VLAN_TX;
2428 enic->loop_enable = 1;
2429 enic->loop_tag = enic->config.loop_tag;
2430 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2431 }
2432 if (ENIC_SETTING(enic, TXCSUM))
2433 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2434 if (ENIC_SETTING(enic, TSO))
2435 netdev->hw_features |= NETIF_F_TSO |
2436 NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2437 if (ENIC_SETTING(enic, RXCSUM))
2438 netdev->hw_features |= NETIF_F_RXCSUM;
2439
2440 netdev->features |= netdev->hw_features;
2441
2442 if (using_dac)
2443 netdev->features |= NETIF_F_HIGHDMA;
2444
2445 err = register_netdev(netdev);
2446 if (err) {
2447 dev_err(dev, "Cannot register net device, aborting\n");
2448 goto err_out_dev_deinit;
2449 }
2450
2451 return 0;
2452
2453 err_out_dev_deinit:
2454 enic_dev_deinit(enic);
2455 err_out_dev_close:
2456 vnic_dev_close(enic->vdev);
2457 err_out_vnic_unregister:
2458 vnic_dev_unregister(enic->vdev);
2459 err_out_iounmap:
2460 enic_iounmap(enic);
2461 err_out_release_regions:
2462 pci_release_regions(pdev);
2463 err_out_disable_device:
2464 pci_disable_device(pdev);
2465 err_out_free_netdev:
2466 pci_set_drvdata(pdev, NULL);
2467 free_netdev(netdev);
2468
2469 return err;
2470 }
2471
2472 static void __devexit enic_remove(struct pci_dev *pdev)
2473 {
2474 struct net_device *netdev = pci_get_drvdata(pdev);
2475
2476 if (netdev) {
2477 struct enic *enic = netdev_priv(netdev);
2478
2479 cancel_work_sync(&enic->reset);
2480 cancel_work_sync(&enic->change_mtu_work);
2481 unregister_netdev(netdev);
2482 enic_dev_deinit(enic);
2483 vnic_dev_close(enic->vdev);
2484 vnic_dev_unregister(enic->vdev);
2485 enic_iounmap(enic);
2486 pci_release_regions(pdev);
2487 pci_disable_device(pdev);
2488 pci_set_drvdata(pdev, NULL);
2489 free_netdev(netdev);
2490 }
2491 }
2492
2493 static struct pci_driver enic_driver = {
2494 .name = DRV_NAME,
2495 .id_table = enic_id_table,
2496 .probe = enic_probe,
2497 .remove = __devexit_p(enic_remove),
2498 };
2499
2500 static int __init enic_init_module(void)
2501 {
2502 pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2503
2504 return pci_register_driver(&enic_driver);
2505 }
2506
2507 static void __exit enic_cleanup_module(void)
2508 {
2509 pci_unregister_driver(&enic_driver);
2510 }
2511
2512 module_init(enic_init_module);
2513 module_exit(enic_cleanup_module);
Linux kernel - Deliverables
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