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Input: wacom - fix touch parsing on newer Bamboos
[linux-btrfs-devel.git] / drivers / net / enic / enic_main.c
blob2f433fbfca0cfa30e8e95fd38aefb901792fad17
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/workqueue.h>
27 #include <linux/pci.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/if_ether.h>
31 #include <linux/if_vlan.h>
32 #include <linux/ethtool.h>
33 #include <linux/in.h>
34 #include <linux/ip.h>
35 #include <linux/ipv6.h>
36 #include <linux/tcp.h>
37 #include <linux/rtnetlink.h>
38 #include <linux/prefetch.h>
39 #include <net/ip6_checksum.h>
40
41 #include "cq_enet_desc.h"
42 #include "vnic_dev.h"
43 #include "vnic_intr.h"
44 #include "vnic_stats.h"
45 #include "vnic_vic.h"
46 #include "enic_res.h"
47 #include "enic.h"
48 #include "enic_dev.h"
49 #include "enic_pp.h"
50
51 #define ENIC_NOTIFY_TIMER_PERIOD (2 * HZ)
52 #define WQ_ENET_MAX_DESC_LEN (1 << WQ_ENET_LEN_BITS)
53 #define MAX_TSO (1 << 16)
54 #define ENIC_DESC_MAX_SPLITS (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
55
56 #define PCI_DEVICE_ID_CISCO_VIC_ENET 0x0043 /* ethernet vnic */
57 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN 0x0044 /* enet dynamic vnic */
58
59 /* Supported devices */
60 static DEFINE_PCI_DEVICE_TABLE(enic_id_table) = {
61 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
62 { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
63 { 0, } /* end of table */
64 };
65
66 MODULE_DESCRIPTION(DRV_DESCRIPTION);
67 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
68 MODULE_LICENSE("GPL");
69 MODULE_VERSION(DRV_VERSION);
70 MODULE_DEVICE_TABLE(pci, enic_id_table);
71
72 struct enic_stat {
73 char name[ETH_GSTRING_LEN];
74 unsigned int offset;
75 };
76
77 #define ENIC_TX_STAT(stat) \
78 { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
79 #define ENIC_RX_STAT(stat) \
80 { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
81
82 static const struct enic_stat enic_tx_stats[] = {
83 ENIC_TX_STAT(tx_frames_ok),
84 ENIC_TX_STAT(tx_unicast_frames_ok),
85 ENIC_TX_STAT(tx_multicast_frames_ok),
86 ENIC_TX_STAT(tx_broadcast_frames_ok),
87 ENIC_TX_STAT(tx_bytes_ok),
88 ENIC_TX_STAT(tx_unicast_bytes_ok),
89 ENIC_TX_STAT(tx_multicast_bytes_ok),
90 ENIC_TX_STAT(tx_broadcast_bytes_ok),
91 ENIC_TX_STAT(tx_drops),
92 ENIC_TX_STAT(tx_errors),
93 ENIC_TX_STAT(tx_tso),
94 };
95
96 static const struct enic_stat enic_rx_stats[] = {
97 ENIC_RX_STAT(rx_frames_ok),
98 ENIC_RX_STAT(rx_frames_total),
99 ENIC_RX_STAT(rx_unicast_frames_ok),
100 ENIC_RX_STAT(rx_multicast_frames_ok),
101 ENIC_RX_STAT(rx_broadcast_frames_ok),
102 ENIC_RX_STAT(rx_bytes_ok),
103 ENIC_RX_STAT(rx_unicast_bytes_ok),
104 ENIC_RX_STAT(rx_multicast_bytes_ok),
105 ENIC_RX_STAT(rx_broadcast_bytes_ok),
106 ENIC_RX_STAT(rx_drop),
107 ENIC_RX_STAT(rx_no_bufs),
108 ENIC_RX_STAT(rx_errors),
109 ENIC_RX_STAT(rx_rss),
110 ENIC_RX_STAT(rx_crc_errors),
111 ENIC_RX_STAT(rx_frames_64),
112 ENIC_RX_STAT(rx_frames_127),
113 ENIC_RX_STAT(rx_frames_255),
114 ENIC_RX_STAT(rx_frames_511),
115 ENIC_RX_STAT(rx_frames_1023),
116 ENIC_RX_STAT(rx_frames_1518),
117 ENIC_RX_STAT(rx_frames_to_max),
118 };
119
120 static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
121 static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
122
123 static int enic_is_dynamic(struct enic *enic)
124 {
125 return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
126 }
127
128 static inline unsigned int enic_cq_rq(struct enic *enic, unsigned int rq)
129 {
130 return rq;
131 }
132
133 static inline unsigned int enic_cq_wq(struct enic *enic, unsigned int wq)
134 {
135 return enic->rq_count + wq;
136 }
137
138 static inline unsigned int enic_legacy_io_intr(void)
139 {
140 return 0;
141 }
142
143 static inline unsigned int enic_legacy_err_intr(void)
144 {
145 return 1;
146 }
147
148 static inline unsigned int enic_legacy_notify_intr(void)
149 {
150 return 2;
151 }
152
153 static inline unsigned int enic_msix_rq_intr(struct enic *enic, unsigned int rq)
154 {
155 return rq;
156 }
157
158 static inline unsigned int enic_msix_wq_intr(struct enic *enic, unsigned int wq)
159 {
160 return enic->rq_count + wq;
161 }
162
163 static inline unsigned int enic_msix_err_intr(struct enic *enic)
164 {
165 return enic->rq_count + enic->wq_count;
166 }
167
168 static inline unsigned int enic_msix_notify_intr(struct enic *enic)
169 {
170 return enic->rq_count + enic->wq_count + 1;
171 }
172
173 static int enic_get_settings(struct net_device *netdev,
174 struct ethtool_cmd *ecmd)
175 {
176 struct enic *enic = netdev_priv(netdev);
177
178 ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
179 ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
180 ecmd->port = PORT_FIBRE;
181 ecmd->transceiver = XCVR_EXTERNAL;
182
183 if (netif_carrier_ok(netdev)) {
184 ethtool_cmd_speed_set(ecmd, vnic_dev_port_speed(enic->vdev));
185 ecmd->duplex = DUPLEX_FULL;
186 } else {
187 ethtool_cmd_speed_set(ecmd, -1);
188 ecmd->duplex = -1;
189 }
190
191 ecmd->autoneg = AUTONEG_DISABLE;
192
193 return 0;
194 }
195
196 static void enic_get_drvinfo(struct net_device *netdev,
197 struct ethtool_drvinfo *drvinfo)
198 {
199 struct enic *enic = netdev_priv(netdev);
200 struct vnic_devcmd_fw_info *fw_info;
201
202 enic_dev_fw_info(enic, &fw_info);
203
204 strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
205 strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
206 strncpy(drvinfo->fw_version, fw_info->fw_version,
207 sizeof(drvinfo->fw_version));
208 strncpy(drvinfo->bus_info, pci_name(enic->pdev),
209 sizeof(drvinfo->bus_info));
210 }
211
212 static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
213 {
214 unsigned int i;
215
216 switch (stringset) {
217 case ETH_SS_STATS:
218 for (i = 0; i < enic_n_tx_stats; i++) {
219 memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
220 data += ETH_GSTRING_LEN;
221 }
222 for (i = 0; i < enic_n_rx_stats; i++) {
223 memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
224 data += ETH_GSTRING_LEN;
225 }
226 break;
227 }
228 }
229
230 static int enic_get_sset_count(struct net_device *netdev, int sset)
231 {
232 switch (sset) {
233 case ETH_SS_STATS:
234 return enic_n_tx_stats + enic_n_rx_stats;
235 default:
236 return -EOPNOTSUPP;
237 }
238 }
239
240 static void enic_get_ethtool_stats(struct net_device *netdev,
241 struct ethtool_stats *stats, u64 *data)
242 {
243 struct enic *enic = netdev_priv(netdev);
244 struct vnic_stats *vstats;
245 unsigned int i;
246
247 enic_dev_stats_dump(enic, &vstats);
248
249 for (i = 0; i < enic_n_tx_stats; i++)
250 *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
251 for (i = 0; i < enic_n_rx_stats; i++)
252 *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
253 }
254
255 static u32 enic_get_msglevel(struct net_device *netdev)
256 {
257 struct enic *enic = netdev_priv(netdev);
258 return enic->msg_enable;
259 }
260
261 static void enic_set_msglevel(struct net_device *netdev, u32 value)
262 {
263 struct enic *enic = netdev_priv(netdev);
264 enic->msg_enable = value;
265 }
266
267 static int enic_get_coalesce(struct net_device *netdev,
268 struct ethtool_coalesce *ecmd)
269 {
270 struct enic *enic = netdev_priv(netdev);
271
272 ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
273 ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
274
275 return 0;
276 }
277
278 static int enic_set_coalesce(struct net_device *netdev,
279 struct ethtool_coalesce *ecmd)
280 {
281 struct enic *enic = netdev_priv(netdev);
282 u32 tx_coalesce_usecs;
283 u32 rx_coalesce_usecs;
284 unsigned int i, intr;
285
286 tx_coalesce_usecs = min_t(u32,
287 INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
288 ecmd->tx_coalesce_usecs);
289 rx_coalesce_usecs = min_t(u32,
290 INTR_COALESCE_HW_TO_USEC(VNIC_INTR_TIMER_MAX),
291 ecmd->rx_coalesce_usecs);
292
293 switch (vnic_dev_get_intr_mode(enic->vdev)) {
294 case VNIC_DEV_INTR_MODE_INTX:
295 if (tx_coalesce_usecs != rx_coalesce_usecs)
296 return -EINVAL;
297
298 intr = enic_legacy_io_intr();
299 vnic_intr_coalescing_timer_set(&enic->intr[intr],
300 INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
301 break;
302 case VNIC_DEV_INTR_MODE_MSI:
303 if (tx_coalesce_usecs != rx_coalesce_usecs)
304 return -EINVAL;
305
306 vnic_intr_coalescing_timer_set(&enic->intr[0],
307 INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
308 break;
309 case VNIC_DEV_INTR_MODE_MSIX:
310 for (i = 0; i < enic->wq_count; i++) {
311 intr = enic_msix_wq_intr(enic, i);
312 vnic_intr_coalescing_timer_set(&enic->intr[intr],
313 INTR_COALESCE_USEC_TO_HW(tx_coalesce_usecs));
314 }
315
316 for (i = 0; i < enic->rq_count; i++) {
317 intr = enic_msix_rq_intr(enic, i);
318 vnic_intr_coalescing_timer_set(&enic->intr[intr],
319 INTR_COALESCE_USEC_TO_HW(rx_coalesce_usecs));
320 }
321
322 break;
323 default:
324 break;
325 }
326
327 enic->tx_coalesce_usecs = tx_coalesce_usecs;
328 enic->rx_coalesce_usecs = rx_coalesce_usecs;
329
330 return 0;
331 }
332
333 static const struct ethtool_ops enic_ethtool_ops = {
334 .get_settings = enic_get_settings,
335 .get_drvinfo = enic_get_drvinfo,
336 .get_msglevel = enic_get_msglevel,
337 .set_msglevel = enic_set_msglevel,
338 .get_link = ethtool_op_get_link,
339 .get_strings = enic_get_strings,
340 .get_sset_count = enic_get_sset_count,
341 .get_ethtool_stats = enic_get_ethtool_stats,
342 .get_coalesce = enic_get_coalesce,
343 .set_coalesce = enic_set_coalesce,
344 };
345
346 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
347 {
348 struct enic *enic = vnic_dev_priv(wq->vdev);
349
350 if (buf->sop)
351 pci_unmap_single(enic->pdev, buf->dma_addr,
352 buf->len, PCI_DMA_TODEVICE);
353 else
354 pci_unmap_page(enic->pdev, buf->dma_addr,
355 buf->len, PCI_DMA_TODEVICE);
356
357 if (buf->os_buf)
358 dev_kfree_skb_any(buf->os_buf);
359 }
360
361 static void enic_wq_free_buf(struct vnic_wq *wq,
362 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
363 {
364 enic_free_wq_buf(wq, buf);
365 }
366
367 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
368 u8 type, u16 q_number, u16 completed_index, void *opaque)
369 {
370 struct enic *enic = vnic_dev_priv(vdev);
371
372 spin_lock(&enic->wq_lock[q_number]);
373
374 vnic_wq_service(&enic->wq[q_number], cq_desc,
375 completed_index, enic_wq_free_buf,
376 opaque);
377
378 if (netif_queue_stopped(enic->netdev) &&
379 vnic_wq_desc_avail(&enic->wq[q_number]) >=
380 (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
381 netif_wake_queue(enic->netdev);
382
383 spin_unlock(&enic->wq_lock[q_number]);
384
385 return 0;
386 }
387
388 static void enic_log_q_error(struct enic *enic)
389 {
390 unsigned int i;
391 u32 error_status;
392
393 for (i = 0; i < enic->wq_count; i++) {
394 error_status = vnic_wq_error_status(&enic->wq[i]);
395 if (error_status)
396 netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
397 i, error_status);
398 }
399
400 for (i = 0; i < enic->rq_count; i++) {
401 error_status = vnic_rq_error_status(&enic->rq[i]);
402 if (error_status)
403 netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
404 i, error_status);
405 }
406 }
407
408 static void enic_msglvl_check(struct enic *enic)
409 {
410 u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
411
412 if (msg_enable != enic->msg_enable) {
413 netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
414 enic->msg_enable, msg_enable);
415 enic->msg_enable = msg_enable;
416 }
417 }
418
419 static void enic_mtu_check(struct enic *enic)
420 {
421 u32 mtu = vnic_dev_mtu(enic->vdev);
422 struct net_device *netdev = enic->netdev;
423
424 if (mtu && mtu != enic->port_mtu) {
425 enic->port_mtu = mtu;
426 if (mtu < netdev->mtu)
427 netdev_warn(netdev,
428 "interface MTU (%d) set higher "
429 "than switch port MTU (%d)\n",
430 netdev->mtu, mtu);
431 }
432 }
433
434 static void enic_link_check(struct enic *enic)
435 {
436 int link_status = vnic_dev_link_status(enic->vdev);
437 int carrier_ok = netif_carrier_ok(enic->netdev);
438
439 if (link_status && !carrier_ok) {
440 netdev_info(enic->netdev, "Link UP\n");
441 netif_carrier_on(enic->netdev);
442 } else if (!link_status && carrier_ok) {
443 netdev_info(enic->netdev, "Link DOWN\n");
444 netif_carrier_off(enic->netdev);
445 }
446 }
447
448 static void enic_notify_check(struct enic *enic)
449 {
450 enic_msglvl_check(enic);
451 enic_mtu_check(enic);
452 enic_link_check(enic);
453 }
454
455 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
456
457 static irqreturn_t enic_isr_legacy(int irq, void *data)
458 {
459 struct net_device *netdev = data;
460 struct enic *enic = netdev_priv(netdev);
461 unsigned int io_intr = enic_legacy_io_intr();
462 unsigned int err_intr = enic_legacy_err_intr();
463 unsigned int notify_intr = enic_legacy_notify_intr();
464 u32 pba;
465
466 vnic_intr_mask(&enic->intr[io_intr]);
467
468 pba = vnic_intr_legacy_pba(enic->legacy_pba);
469 if (!pba) {
470 vnic_intr_unmask(&enic->intr[io_intr]);
471 return IRQ_NONE; /* not our interrupt */
472 }
473
474 if (ENIC_TEST_INTR(pba, notify_intr)) {
475 vnic_intr_return_all_credits(&enic->intr[notify_intr]);
476 enic_notify_check(enic);
477 }
478
479 if (ENIC_TEST_INTR(pba, err_intr)) {
480 vnic_intr_return_all_credits(&enic->intr[err_intr]);
481 enic_log_q_error(enic);
482 /* schedule recovery from WQ/RQ error */
483 schedule_work(&enic->reset);
484 return IRQ_HANDLED;
485 }
486
487 if (ENIC_TEST_INTR(pba, io_intr)) {
488 if (napi_schedule_prep(&enic->napi[0]))
489 __napi_schedule(&enic->napi[0]);
490 } else {
491 vnic_intr_unmask(&enic->intr[io_intr]);
492 }
493
494 return IRQ_HANDLED;
495 }
496
497 static irqreturn_t enic_isr_msi(int irq, void *data)
498 {
499 struct enic *enic = data;
500
501 /* With MSI, there is no sharing of interrupts, so this is
502 * our interrupt and there is no need to ack it. The device
503 * is not providing per-vector masking, so the OS will not
504 * write to PCI config space to mask/unmask the interrupt.
505 * We're using mask_on_assertion for MSI, so the device
506 * automatically masks the interrupt when the interrupt is
507 * generated. Later, when exiting polling, the interrupt
508 * will be unmasked (see enic_poll).
509 *
510 * Also, the device uses the same PCIe Traffic Class (TC)
511 * for Memory Write data and MSI, so there are no ordering
512 * issues; the MSI will always arrive at the Root Complex
513 * _after_ corresponding Memory Writes (i.e. descriptor
514 * writes).
515 */
516
517 napi_schedule(&enic->napi[0]);
518
519 return IRQ_HANDLED;
520 }
521
522 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
523 {
524 struct napi_struct *napi = data;
525
526 /* schedule NAPI polling for RQ cleanup */
527 napi_schedule(napi);
528
529 return IRQ_HANDLED;
530 }
531
532 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
533 {
534 struct enic *enic = data;
535 unsigned int cq = enic_cq_wq(enic, 0);
536 unsigned int intr = enic_msix_wq_intr(enic, 0);
537 unsigned int wq_work_to_do = -1; /* no limit */
538 unsigned int wq_work_done;
539
540 wq_work_done = vnic_cq_service(&enic->cq[cq],
541 wq_work_to_do, enic_wq_service, NULL);
542
543 vnic_intr_return_credits(&enic->intr[intr],
544 wq_work_done,
545 1 /* unmask intr */,
546 1 /* reset intr timer */);
547
548 return IRQ_HANDLED;
549 }
550
551 static irqreturn_t enic_isr_msix_err(int irq, void *data)
552 {
553 struct enic *enic = data;
554 unsigned int intr = enic_msix_err_intr(enic);
555
556 vnic_intr_return_all_credits(&enic->intr[intr]);
557
558 enic_log_q_error(enic);
559
560 /* schedule recovery from WQ/RQ error */
561 schedule_work(&enic->reset);
562
563 return IRQ_HANDLED;
564 }
565
566 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
567 {
568 struct enic *enic = data;
569 unsigned int intr = enic_msix_notify_intr(enic);
570
571 vnic_intr_return_all_credits(&enic->intr[intr]);
572 enic_notify_check(enic);
573
574 return IRQ_HANDLED;
575 }
576
577 static inline void enic_queue_wq_skb_cont(struct enic *enic,
578 struct vnic_wq *wq, struct sk_buff *skb,
579 unsigned int len_left, int loopback)
580 {
581 skb_frag_t *frag;
582
583 /* Queue additional data fragments */
584 for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
585 len_left -= frag->size;
586 enic_queue_wq_desc_cont(wq, skb,
587 pci_map_page(enic->pdev, frag->page,
588 frag->page_offset, frag->size,
589 PCI_DMA_TODEVICE),
590 frag->size,
591 (len_left == 0), /* EOP? */
592 loopback);
593 }
594 }
595
596 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
597 struct vnic_wq *wq, struct sk_buff *skb,
598 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
599 {
600 unsigned int head_len = skb_headlen(skb);
601 unsigned int len_left = skb->len - head_len;
602 int eop = (len_left == 0);
603
604 /* Queue the main skb fragment. The fragments are no larger
605 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
606 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
607 * per fragment is queued.
608 */
609 enic_queue_wq_desc(wq, skb,
610 pci_map_single(enic->pdev, skb->data,
611 head_len, PCI_DMA_TODEVICE),
612 head_len,
613 vlan_tag_insert, vlan_tag,
614 eop, loopback);
615
616 if (!eop)
617 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
618 }
619
620 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
621 struct vnic_wq *wq, struct sk_buff *skb,
622 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
623 {
624 unsigned int head_len = skb_headlen(skb);
625 unsigned int len_left = skb->len - head_len;
626 unsigned int hdr_len = skb_checksum_start_offset(skb);
627 unsigned int csum_offset = hdr_len + skb->csum_offset;
628 int eop = (len_left == 0);
629
630 /* Queue the main skb fragment. The fragments are no larger
631 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
632 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
633 * per fragment is queued.
634 */
635 enic_queue_wq_desc_csum_l4(wq, skb,
636 pci_map_single(enic->pdev, skb->data,
637 head_len, PCI_DMA_TODEVICE),
638 head_len,
639 csum_offset,
640 hdr_len,
641 vlan_tag_insert, vlan_tag,
642 eop, loopback);
643
644 if (!eop)
645 enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
646 }
647
648 static inline void enic_queue_wq_skb_tso(struct enic *enic,
649 struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
650 int vlan_tag_insert, unsigned int vlan_tag, int loopback)
651 {
652 unsigned int frag_len_left = skb_headlen(skb);
653 unsigned int len_left = skb->len - frag_len_left;
654 unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
655 int eop = (len_left == 0);
656 unsigned int len;
657 dma_addr_t dma_addr;
658 unsigned int offset = 0;
659 skb_frag_t *frag;
660
661 /* Preload TCP csum field with IP pseudo hdr calculated
662 * with IP length set to zero. HW will later add in length
663 * to each TCP segment resulting from the TSO.
664 */
665
666 if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
667 ip_hdr(skb)->check = 0;
668 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
669 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
670 } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
671 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
672 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
673 }
674
675 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
676 * for the main skb fragment
677 */
678 while (frag_len_left) {
679 len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
680 dma_addr = pci_map_single(enic->pdev, skb->data + offset,
681 len, PCI_DMA_TODEVICE);
682 enic_queue_wq_desc_tso(wq, skb,
683 dma_addr,
684 len,
685 mss, hdr_len,
686 vlan_tag_insert, vlan_tag,
687 eop && (len == frag_len_left), loopback);
688 frag_len_left -= len;
689 offset += len;
690 }
691
692 if (eop)
693 return;
694
695 /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
696 * for additional data fragments
697 */
698 for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
699 len_left -= frag->size;
700 frag_len_left = frag->size;
701 offset = frag->page_offset;
702
703 while (frag_len_left) {
704 len = min(frag_len_left,
705 (unsigned int)WQ_ENET_MAX_DESC_LEN);
706 dma_addr = pci_map_page(enic->pdev, frag->page,
707 offset, len,
708 PCI_DMA_TODEVICE);
709 enic_queue_wq_desc_cont(wq, skb,
710 dma_addr,
711 len,
712 (len_left == 0) &&
713 (len == frag_len_left), /* EOP? */
714 loopback);
715 frag_len_left -= len;
716 offset += len;
717 }
718 }
719 }
720
721 static inline void enic_queue_wq_skb(struct enic *enic,
722 struct vnic_wq *wq, struct sk_buff *skb)
723 {
724 unsigned int mss = skb_shinfo(skb)->gso_size;
725 unsigned int vlan_tag = 0;
726 int vlan_tag_insert = 0;
727 int loopback = 0;
728
729 if (vlan_tx_tag_present(skb)) {
730 /* VLAN tag from trunking driver */
731 vlan_tag_insert = 1;
732 vlan_tag = vlan_tx_tag_get(skb);
733 } else if (enic->loop_enable) {
734 vlan_tag = enic->loop_tag;
735 loopback = 1;
736 }
737
738 if (mss)
739 enic_queue_wq_skb_tso(enic, wq, skb, mss,
740 vlan_tag_insert, vlan_tag, loopback);
741 else if (skb->ip_summed == CHECKSUM_PARTIAL)
742 enic_queue_wq_skb_csum_l4(enic, wq, skb,
743 vlan_tag_insert, vlan_tag, loopback);
744 else
745 enic_queue_wq_skb_vlan(enic, wq, skb,
746 vlan_tag_insert, vlan_tag, loopback);
747 }
748
749 /* netif_tx_lock held, process context with BHs disabled, or BH */
750 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
751 struct net_device *netdev)
752 {
753 struct enic *enic = netdev_priv(netdev);
754 struct vnic_wq *wq = &enic->wq[0];
755 unsigned long flags;
756
757 if (skb->len <= 0) {
758 dev_kfree_skb(skb);
759 return NETDEV_TX_OK;
760 }
761
762 /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
763 * which is very likely. In the off chance it's going to take
764 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
765 */
766
767 if (skb_shinfo(skb)->gso_size == 0 &&
768 skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
769 skb_linearize(skb)) {
770 dev_kfree_skb(skb);
771 return NETDEV_TX_OK;
772 }
773
774 spin_lock_irqsave(&enic->wq_lock[0], flags);
775
776 if (vnic_wq_desc_avail(wq) <
777 skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
778 netif_stop_queue(netdev);
779 /* This is a hard error, log it */
780 netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
781 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
782 return NETDEV_TX_BUSY;
783 }
784
785 enic_queue_wq_skb(enic, wq, skb);
786
787 if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
788 netif_stop_queue(netdev);
789
790 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
791
792 return NETDEV_TX_OK;
793 }
794
795 /* dev_base_lock rwlock held, nominally process context */
796 static struct net_device_stats *enic_get_stats(struct net_device *netdev)
797 {
798 struct enic *enic = netdev_priv(netdev);
799 struct net_device_stats *net_stats = &netdev->stats;
800 struct vnic_stats *stats;
801
802 enic_dev_stats_dump(enic, &stats);
803
804 net_stats->tx_packets = stats->tx.tx_frames_ok;
805 net_stats->tx_bytes = stats->tx.tx_bytes_ok;
806 net_stats->tx_errors = stats->tx.tx_errors;
807 net_stats->tx_dropped = stats->tx.tx_drops;
808
809 net_stats->rx_packets = stats->rx.rx_frames_ok;
810 net_stats->rx_bytes = stats->rx.rx_bytes_ok;
811 net_stats->rx_errors = stats->rx.rx_errors;
812 net_stats->multicast = stats->rx.rx_multicast_frames_ok;
813 net_stats->rx_over_errors = enic->rq_truncated_pkts;
814 net_stats->rx_crc_errors = enic->rq_bad_fcs;
815 net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
816
817 return net_stats;
818 }
819
820 void enic_reset_addr_lists(struct enic *enic)
821 {
822 enic->mc_count = 0;
823 enic->uc_count = 0;
824 enic->flags = 0;
825 }
826
827 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
828 {
829 struct enic *enic = netdev_priv(netdev);
830
831 if (enic_is_dynamic(enic)) {
832 if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
833 return -EADDRNOTAVAIL;
834 } else {
835 if (!is_valid_ether_addr(addr))
836 return -EADDRNOTAVAIL;
837 }
838
839 memcpy(netdev->dev_addr, addr, netdev->addr_len);
840
841 return 0;
842 }
843
844 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
845 {
846 struct enic *enic = netdev_priv(netdev);
847 struct sockaddr *saddr = p;
848 char *addr = saddr->sa_data;
849 int err;
850
851 if (netif_running(enic->netdev)) {
852 err = enic_dev_del_station_addr(enic);
853 if (err)
854 return err;
855 }
856
857 err = enic_set_mac_addr(netdev, addr);
858 if (err)
859 return err;
860
861 if (netif_running(enic->netdev)) {
862 err = enic_dev_add_station_addr(enic);
863 if (err)
864 return err;
865 }
866
867 return err;
868 }
869
870 static int enic_set_mac_address(struct net_device *netdev, void *p)
871 {
872 struct sockaddr *saddr = p;
873 char *addr = saddr->sa_data;
874 struct enic *enic = netdev_priv(netdev);
875 int err;
876
877 err = enic_dev_del_station_addr(enic);
878 if (err)
879 return err;
880
881 err = enic_set_mac_addr(netdev, addr);
882 if (err)
883 return err;
884
885 return enic_dev_add_station_addr(enic);
886 }
887
888 static void enic_update_multicast_addr_list(struct enic *enic)
889 {
890 struct net_device *netdev = enic->netdev;
891 struct netdev_hw_addr *ha;
892 unsigned int mc_count = netdev_mc_count(netdev);
893 u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
894 unsigned int i, j;
895
896 if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS) {
897 netdev_warn(netdev, "Registering only %d out of %d "
898 "multicast addresses\n",
899 ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
900 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
901 }
902
903 /* Is there an easier way? Trying to minimize to
904 * calls to add/del multicast addrs. We keep the
905 * addrs from the last call in enic->mc_addr and
906 * look for changes to add/del.
907 */
908
909 i = 0;
910 netdev_for_each_mc_addr(ha, netdev) {
911 if (i == mc_count)
912 break;
913 memcpy(mc_addr[i++], ha->addr, ETH_ALEN);
914 }
915
916 for (i = 0; i < enic->mc_count; i++) {
917 for (j = 0; j < mc_count; j++)
918 if (compare_ether_addr(enic->mc_addr[i],
919 mc_addr[j]) == 0)
920 break;
921 if (j == mc_count)
922 enic_dev_del_addr(enic, enic->mc_addr[i]);
923 }
924
925 for (i = 0; i < mc_count; i++) {
926 for (j = 0; j < enic->mc_count; j++)
927 if (compare_ether_addr(mc_addr[i],
928 enic->mc_addr[j]) == 0)
929 break;
930 if (j == enic->mc_count)
931 enic_dev_add_addr(enic, mc_addr[i]);
932 }
933
934 /* Save the list to compare against next time
935 */
936
937 for (i = 0; i < mc_count; i++)
938 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
939
940 enic->mc_count = mc_count;
941 }
942
943 static void enic_update_unicast_addr_list(struct enic *enic)
944 {
945 struct net_device *netdev = enic->netdev;
946 struct netdev_hw_addr *ha;
947 unsigned int uc_count = netdev_uc_count(netdev);
948 u8 uc_addr[ENIC_UNICAST_PERFECT_FILTERS][ETH_ALEN];
949 unsigned int i, j;
950
951 if (uc_count > ENIC_UNICAST_PERFECT_FILTERS) {
952 netdev_warn(netdev, "Registering only %d out of %d "
953 "unicast addresses\n",
954 ENIC_UNICAST_PERFECT_FILTERS, uc_count);
955 uc_count = ENIC_UNICAST_PERFECT_FILTERS;
956 }
957
958 /* Is there an easier way? Trying to minimize to
959 * calls to add/del unicast addrs. We keep the
960 * addrs from the last call in enic->uc_addr and
961 * look for changes to add/del.
962 */
963
964 i = 0;
965 netdev_for_each_uc_addr(ha, netdev) {
966 if (i == uc_count)
967 break;
968 memcpy(uc_addr[i++], ha->addr, ETH_ALEN);
969 }
970
971 for (i = 0; i < enic->uc_count; i++) {
972 for (j = 0; j < uc_count; j++)
973 if (compare_ether_addr(enic->uc_addr[i],
974 uc_addr[j]) == 0)
975 break;
976 if (j == uc_count)
977 enic_dev_del_addr(enic, enic->uc_addr[i]);
978 }
979
980 for (i = 0; i < uc_count; i++) {
981 for (j = 0; j < enic->uc_count; j++)
982 if (compare_ether_addr(uc_addr[i],
983 enic->uc_addr[j]) == 0)
984 break;
985 if (j == enic->uc_count)
986 enic_dev_add_addr(enic, uc_addr[i]);
987 }
988
989 /* Save the list to compare against next time
990 */
991
992 for (i = 0; i < uc_count; i++)
993 memcpy(enic->uc_addr[i], uc_addr[i], ETH_ALEN);
994
995 enic->uc_count = uc_count;
996 }
997
998 /* netif_tx_lock held, BHs disabled */
999 static void enic_set_rx_mode(struct net_device *netdev)
1000 {
1001 struct enic *enic = netdev_priv(netdev);
1002 int directed = 1;
1003 int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
1004 int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
1005 int promisc = (netdev->flags & IFF_PROMISC) ||
1006 netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
1007 int allmulti = (netdev->flags & IFF_ALLMULTI) ||
1008 netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
1009 unsigned int flags = netdev->flags |
1010 (allmulti ? IFF_ALLMULTI : 0) |
1011 (promisc ? IFF_PROMISC : 0);
1012
1013 if (enic->flags != flags) {
1014 enic->flags = flags;
1015 enic_dev_packet_filter(enic, directed,
1016 multicast, broadcast, promisc, allmulti);
1017 }
1018
1019 if (!promisc) {
1020 enic_update_unicast_addr_list(enic);
1021 if (!allmulti)
1022 enic_update_multicast_addr_list(enic);
1023 }
1024 }
1025
1026 /* rtnl lock is held */
1027 static void enic_vlan_rx_register(struct net_device *netdev,
1028 struct vlan_group *vlan_group)
1029 {
1030 struct enic *enic = netdev_priv(netdev);
1031 enic->vlan_group = vlan_group;
1032 }
1033
1034 /* netif_tx_lock held, BHs disabled */
1035 static void enic_tx_timeout(struct net_device *netdev)
1036 {
1037 struct enic *enic = netdev_priv(netdev);
1038 schedule_work(&enic->reset);
1039 }
1040
1041 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
1042 {
1043 struct enic *enic = netdev_priv(netdev);
1044
1045 if (vf != PORT_SELF_VF)
1046 return -EOPNOTSUPP;
1047
1048 /* Ignore the vf argument for now. We can assume the request
1049 * is coming on a vf.
1050 */
1051 if (is_valid_ether_addr(mac)) {
1052 memcpy(enic->pp.vf_mac, mac, ETH_ALEN);
1053 return 0;
1054 } else
1055 return -EINVAL;
1056 }
1057
1058 static int enic_set_vf_port(struct net_device *netdev, int vf,
1059 struct nlattr *port[])
1060 {
1061 struct enic *enic = netdev_priv(netdev);
1062 struct enic_port_profile prev_pp;
1063 int err = 0, restore_pp = 1;
1064
1065 /* don't support VFs, yet */
1066 if (vf != PORT_SELF_VF)
1067 return -EOPNOTSUPP;
1068
1069 if (!port[IFLA_PORT_REQUEST])
1070 return -EOPNOTSUPP;
1071
1072 memcpy(&prev_pp, &enic->pp, sizeof(enic->pp));
1073 memset(&enic->pp, 0, sizeof(enic->pp));
1074
1075 enic->pp.set |= ENIC_SET_REQUEST;
1076 enic->pp.request = nla_get_u8(port[IFLA_PORT_REQUEST]);
1077
1078 if (port[IFLA_PORT_PROFILE]) {
1079 enic->pp.set |= ENIC_SET_NAME;
1080 memcpy(enic->pp.name, nla_data(port[IFLA_PORT_PROFILE]),
1081 PORT_PROFILE_MAX);
1082 }
1083
1084 if (port[IFLA_PORT_INSTANCE_UUID]) {
1085 enic->pp.set |= ENIC_SET_INSTANCE;
1086 memcpy(enic->pp.instance_uuid,
1087 nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
1088 }
1089
1090 if (port[IFLA_PORT_HOST_UUID]) {
1091 enic->pp.set |= ENIC_SET_HOST;
1092 memcpy(enic->pp.host_uuid,
1093 nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
1094 }
1095
1096 /* Special case handling: mac came from IFLA_VF_MAC */
1097 if (!is_zero_ether_addr(prev_pp.vf_mac))
1098 memcpy(enic->pp.mac_addr, prev_pp.vf_mac, ETH_ALEN);
1099
1100 if (is_zero_ether_addr(netdev->dev_addr))
1101 random_ether_addr(netdev->dev_addr);
1102
1103 err = enic_process_set_pp_request(enic, &prev_pp, &restore_pp);
1104 if (err) {
1105 if (restore_pp) {
1106 /* Things are still the way they were: Implicit
1107 * DISASSOCIATE failed
1108 */
1109 memcpy(&enic->pp, &prev_pp, sizeof(enic->pp));
1110 } else {
1111 memset(&enic->pp, 0, sizeof(enic->pp));
1112 memset(netdev->dev_addr, 0, ETH_ALEN);
1113 }
1114 } else {
1115 /* Set flag to indicate that the port assoc/disassoc
1116 * request has been sent out to fw
1117 */
1118 enic->pp.set |= ENIC_PORT_REQUEST_APPLIED;
1119
1120 /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
1121 if (enic->pp.request == PORT_REQUEST_DISASSOCIATE) {
1122 memset(enic->pp.mac_addr, 0, ETH_ALEN);
1123 memset(netdev->dev_addr, 0, ETH_ALEN);
1124 }
1125 }
1126
1127 memset(enic->pp.vf_mac, 0, ETH_ALEN);
1128
1129 return err;
1130 }
1131
1132 static int enic_get_vf_port(struct net_device *netdev, int vf,
1133 struct sk_buff *skb)
1134 {
1135 struct enic *enic = netdev_priv(netdev);
1136 u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
1137 int err;
1138
1139 if (!(enic->pp.set & ENIC_PORT_REQUEST_APPLIED))
1140 return -ENODATA;
1141
1142 err = enic_process_get_pp_request(enic, enic->pp.request, &response);
1143 if (err)
1144 return err;
1145
1146 NLA_PUT_U16(skb, IFLA_PORT_REQUEST, enic->pp.request);
1147 NLA_PUT_U16(skb, IFLA_PORT_RESPONSE, response);
1148 if (enic->pp.set & ENIC_SET_NAME)
1149 NLA_PUT(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX,
1150 enic->pp.name);
1151 if (enic->pp.set & ENIC_SET_INSTANCE)
1152 NLA_PUT(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
1153 enic->pp.instance_uuid);
1154 if (enic->pp.set & ENIC_SET_HOST)
1155 NLA_PUT(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX,
1156 enic->pp.host_uuid);
1157
1158 return 0;
1159
1160 nla_put_failure:
1161 return -EMSGSIZE;
1162 }
1163
1164 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1165 {
1166 struct enic *enic = vnic_dev_priv(rq->vdev);
1167
1168 if (!buf->os_buf)
1169 return;
1170
1171 pci_unmap_single(enic->pdev, buf->dma_addr,
1172 buf->len, PCI_DMA_FROMDEVICE);
1173 dev_kfree_skb_any(buf->os_buf);
1174 }
1175
1176 static int enic_rq_alloc_buf(struct vnic_rq *rq)
1177 {
1178 struct enic *enic = vnic_dev_priv(rq->vdev);
1179 struct net_device *netdev = enic->netdev;
1180 struct sk_buff *skb;
1181 unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
1182 unsigned int os_buf_index = 0;
1183 dma_addr_t dma_addr;
1184
1185 skb = netdev_alloc_skb_ip_align(netdev, len);
1186 if (!skb)
1187 return -ENOMEM;
1188
1189 dma_addr = pci_map_single(enic->pdev, skb->data,
1190 len, PCI_DMA_FROMDEVICE);
1191
1192 enic_queue_rq_desc(rq, skb, os_buf_index,
1193 dma_addr, len);
1194
1195 return 0;
1196 }
1197
1198 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1199 struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1200 int skipped, void *opaque)
1201 {
1202 struct enic *enic = vnic_dev_priv(rq->vdev);
1203 struct net_device *netdev = enic->netdev;
1204 struct sk_buff *skb;
1205
1206 u8 type, color, eop, sop, ingress_port, vlan_stripped;
1207 u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1208 u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1209 u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1210 u8 packet_error;
1211 u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1212 u32 rss_hash;
1213
1214 if (skipped)
1215 return;
1216
1217 skb = buf->os_buf;
1218 prefetch(skb->data - NET_IP_ALIGN);
1219 pci_unmap_single(enic->pdev, buf->dma_addr,
1220 buf->len, PCI_DMA_FROMDEVICE);
1221
1222 cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1223 &type, &color, &q_number, &completed_index,
1224 &ingress_port, &fcoe, &eop, &sop, &rss_type,
1225 &csum_not_calc, &rss_hash, &bytes_written,
1226 &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1227 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1228 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1229 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1230 &fcs_ok);
1231
1232 if (packet_error) {
1233
1234 if (!fcs_ok) {
1235 if (bytes_written > 0)
1236 enic->rq_bad_fcs++;
1237 else if (bytes_written == 0)
1238 enic->rq_truncated_pkts++;
1239 }
1240
1241 dev_kfree_skb_any(skb);
1242
1243 return;
1244 }
1245
1246 if (eop && bytes_written > 0) {
1247
1248 /* Good receive
1249 */
1250
1251 skb_put(skb, bytes_written);
1252 skb->protocol = eth_type_trans(skb, netdev);
1253
1254 if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc) {
1255 skb->csum = htons(checksum);
1256 skb->ip_summed = CHECKSUM_COMPLETE;
1257 }
1258
1259 skb->dev = netdev;
1260
1261 if (enic->vlan_group && vlan_stripped &&
1262 (vlan_tci & CQ_ENET_RQ_DESC_VLAN_TCI_VLAN_MASK)) {
1263
1264 if (netdev->features & NETIF_F_GRO)
1265 vlan_gro_receive(&enic->napi[q_number],
1266 enic->vlan_group, vlan_tci, skb);
1267 else
1268 vlan_hwaccel_receive_skb(skb,
1269 enic->vlan_group, vlan_tci);
1270
1271 } else {
1272
1273 if (netdev->features & NETIF_F_GRO)
1274 napi_gro_receive(&enic->napi[q_number], skb);
1275 else
1276 netif_receive_skb(skb);
1277
1278 }
1279 } else {
1280
1281 /* Buffer overflow
1282 */
1283
1284 dev_kfree_skb_any(skb);
1285 }
1286 }
1287
1288 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1289 u8 type, u16 q_number, u16 completed_index, void *opaque)
1290 {
1291 struct enic *enic = vnic_dev_priv(vdev);
1292
1293 vnic_rq_service(&enic->rq[q_number], cq_desc,
1294 completed_index, VNIC_RQ_RETURN_DESC,
1295 enic_rq_indicate_buf, opaque);
1296
1297 return 0;
1298 }
1299
1300 static int enic_poll(struct napi_struct *napi, int budget)
1301 {
1302 struct net_device *netdev = napi->dev;
1303 struct enic *enic = netdev_priv(netdev);
1304 unsigned int cq_rq = enic_cq_rq(enic, 0);
1305 unsigned int cq_wq = enic_cq_wq(enic, 0);
1306 unsigned int intr = enic_legacy_io_intr();
1307 unsigned int rq_work_to_do = budget;
1308 unsigned int wq_work_to_do = -1; /* no limit */
1309 unsigned int work_done, rq_work_done, wq_work_done;
1310 int err;
1311
1312 /* Service RQ (first) and WQ
1313 */
1314
1315 rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1316 rq_work_to_do, enic_rq_service, NULL);
1317
1318 wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
1319 wq_work_to_do, enic_wq_service, NULL);
1320
1321 /* Accumulate intr event credits for this polling
1322 * cycle. An intr event is the completion of a
1323 * a WQ or RQ packet.
1324 */
1325
1326 work_done = rq_work_done + wq_work_done;
1327
1328 if (work_done > 0)
1329 vnic_intr_return_credits(&enic->intr[intr],
1330 work_done,
1331 0 /* don't unmask intr */,
1332 0 /* don't reset intr timer */);
1333
1334 err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1335
1336 /* Buffer allocation failed. Stay in polling
1337 * mode so we can try to fill the ring again.
1338 */
1339
1340 if (err)
1341 rq_work_done = rq_work_to_do;
1342
1343 if (rq_work_done < rq_work_to_do) {
1344
1345 /* Some work done, but not enough to stay in polling,
1346 * exit polling
1347 */
1348
1349 napi_complete(napi);
1350 vnic_intr_unmask(&enic->intr[intr]);
1351 }
1352
1353 return rq_work_done;
1354 }
1355
1356 static int enic_poll_msix(struct napi_struct *napi, int budget)
1357 {
1358 struct net_device *netdev = napi->dev;
1359 struct enic *enic = netdev_priv(netdev);
1360 unsigned int rq = (napi - &enic->napi[0]);
1361 unsigned int cq = enic_cq_rq(enic, rq);
1362 unsigned int intr = enic_msix_rq_intr(enic, rq);
1363 unsigned int work_to_do = budget;
1364 unsigned int work_done;
1365 int err;
1366
1367 /* Service RQ
1368 */
1369
1370 work_done = vnic_cq_service(&enic->cq[cq],
1371 work_to_do, enic_rq_service, NULL);
1372
1373 /* Return intr event credits for this polling
1374 * cycle. An intr event is the completion of a
1375 * RQ packet.
1376 */
1377
1378 if (work_done > 0)
1379 vnic_intr_return_credits(&enic->intr[intr],
1380 work_done,
1381 0 /* don't unmask intr */,
1382 0 /* don't reset intr timer */);
1383
1384 err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1385
1386 /* Buffer allocation failed. Stay in polling mode
1387 * so we can try to fill the ring again.
1388 */
1389
1390 if (err)
1391 work_done = work_to_do;
1392
1393 if (work_done < work_to_do) {
1394
1395 /* Some work done, but not enough to stay in polling,
1396 * exit polling
1397 */
1398
1399 napi_complete(napi);
1400 vnic_intr_unmask(&enic->intr[intr]);
1401 }
1402
1403 return work_done;
1404 }
1405
1406 static void enic_notify_timer(unsigned long data)
1407 {
1408 struct enic *enic = (struct enic *)data;
1409
1410 enic_notify_check(enic);
1411
1412 mod_timer(&enic->notify_timer,
1413 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1414 }
1415
1416 static void enic_free_intr(struct enic *enic)
1417 {
1418 struct net_device *netdev = enic->netdev;
1419 unsigned int i;
1420
1421 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1422 case VNIC_DEV_INTR_MODE_INTX:
1423 free_irq(enic->pdev->irq, netdev);
1424 break;
1425 case VNIC_DEV_INTR_MODE_MSI:
1426 free_irq(enic->pdev->irq, enic);
1427 break;
1428 case VNIC_DEV_INTR_MODE_MSIX:
1429 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1430 if (enic->msix[i].requested)
1431 free_irq(enic->msix_entry[i].vector,
1432 enic->msix[i].devid);
1433 break;
1434 default:
1435 break;
1436 }
1437 }
1438
1439 static int enic_request_intr(struct enic *enic)
1440 {
1441 struct net_device *netdev = enic->netdev;
1442 unsigned int i, intr;
1443 int err = 0;
1444
1445 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1446
1447 case VNIC_DEV_INTR_MODE_INTX:
1448
1449 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1450 IRQF_SHARED, netdev->name, netdev);
1451 break;
1452
1453 case VNIC_DEV_INTR_MODE_MSI:
1454
1455 err = request_irq(enic->pdev->irq, enic_isr_msi,
1456 0, netdev->name, enic);
1457 break;
1458
1459 case VNIC_DEV_INTR_MODE_MSIX:
1460
1461 for (i = 0; i < enic->rq_count; i++) {
1462 intr = enic_msix_rq_intr(enic, i);
1463 sprintf(enic->msix[intr].devname,
1464 "%.11s-rx-%d", netdev->name, i);
1465 enic->msix[intr].isr = enic_isr_msix_rq;
1466 enic->msix[intr].devid = &enic->napi[i];
1467 }
1468
1469 for (i = 0; i < enic->wq_count; i++) {
1470 intr = enic_msix_wq_intr(enic, i);
1471 sprintf(enic->msix[intr].devname,
1472 "%.11s-tx-%d", netdev->name, i);
1473 enic->msix[intr].isr = enic_isr_msix_wq;
1474 enic->msix[intr].devid = enic;
1475 }
1476
1477 intr = enic_msix_err_intr(enic);
1478 sprintf(enic->msix[intr].devname,
1479 "%.11s-err", netdev->name);
1480 enic->msix[intr].isr = enic_isr_msix_err;
1481 enic->msix[intr].devid = enic;
1482
1483 intr = enic_msix_notify_intr(enic);
1484 sprintf(enic->msix[intr].devname,
1485 "%.11s-notify", netdev->name);
1486 enic->msix[intr].isr = enic_isr_msix_notify;
1487 enic->msix[intr].devid = enic;
1488
1489 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1490 enic->msix[i].requested = 0;
1491
1492 for (i = 0; i < enic->intr_count; i++) {
1493 err = request_irq(enic->msix_entry[i].vector,
1494 enic->msix[i].isr, 0,
1495 enic->msix[i].devname,
1496 enic->msix[i].devid);
1497 if (err) {
1498 enic_free_intr(enic);
1499 break;
1500 }
1501 enic->msix[i].requested = 1;
1502 }
1503
1504 break;
1505
1506 default:
1507 break;
1508 }
1509
1510 return err;
1511 }
1512
1513 static void enic_synchronize_irqs(struct enic *enic)
1514 {
1515 unsigned int i;
1516
1517 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1518 case VNIC_DEV_INTR_MODE_INTX:
1519 case VNIC_DEV_INTR_MODE_MSI:
1520 synchronize_irq(enic->pdev->irq);
1521 break;
1522 case VNIC_DEV_INTR_MODE_MSIX:
1523 for (i = 0; i < enic->intr_count; i++)
1524 synchronize_irq(enic->msix_entry[i].vector);
1525 break;
1526 default:
1527 break;
1528 }
1529 }
1530
1531 static int enic_dev_notify_set(struct enic *enic)
1532 {
1533 int err;
1534
1535 spin_lock(&enic->devcmd_lock);
1536 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1537 case VNIC_DEV_INTR_MODE_INTX:
1538 err = vnic_dev_notify_set(enic->vdev,
1539 enic_legacy_notify_intr());
1540 break;
1541 case VNIC_DEV_INTR_MODE_MSIX:
1542 err = vnic_dev_notify_set(enic->vdev,
1543 enic_msix_notify_intr(enic));
1544 break;
1545 default:
1546 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1547 break;
1548 }
1549 spin_unlock(&enic->devcmd_lock);
1550
1551 return err;
1552 }
1553
1554 static void enic_notify_timer_start(struct enic *enic)
1555 {
1556 switch (vnic_dev_get_intr_mode(enic->vdev)) {
1557 case VNIC_DEV_INTR_MODE_MSI:
1558 mod_timer(&enic->notify_timer, jiffies);
1559 break;
1560 default:
1561 /* Using intr for notification for INTx/MSI-X */
1562 break;
1563 };
1564 }
1565
1566 /* rtnl lock is held, process context */
1567 static int enic_open(struct net_device *netdev)
1568 {
1569 struct enic *enic = netdev_priv(netdev);
1570 unsigned int i;
1571 int err;
1572
1573 err = enic_request_intr(enic);
1574 if (err) {
1575 netdev_err(netdev, "Unable to request irq.\n");
1576 return err;
1577 }
1578
1579 err = enic_dev_notify_set(enic);
1580 if (err) {
1581 netdev_err(netdev,
1582 "Failed to alloc notify buffer, aborting.\n");
1583 goto err_out_free_intr;
1584 }
1585
1586 for (i = 0; i < enic->rq_count; i++) {
1587 vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1588 /* Need at least one buffer on ring to get going */
1589 if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1590 netdev_err(netdev, "Unable to alloc receive buffers\n");
1591 err = -ENOMEM;
1592 goto err_out_notify_unset;
1593 }
1594 }
1595
1596 for (i = 0; i < enic->wq_count; i++)
1597 vnic_wq_enable(&enic->wq[i]);
1598 for (i = 0; i < enic->rq_count; i++)
1599 vnic_rq_enable(&enic->rq[i]);
1600
1601 if (enic_is_dynamic(enic) && !is_zero_ether_addr(enic->pp.mac_addr))
1602 enic_dev_add_addr(enic, enic->pp.mac_addr);
1603 else
1604 enic_dev_add_station_addr(enic);
1605 enic_set_rx_mode(netdev);
1606
1607 netif_wake_queue(netdev);
1608
1609 for (i = 0; i < enic->rq_count; i++)
1610 napi_enable(&enic->napi[i]);
1611
1612 enic_dev_enable(enic);
1613
1614 for (i = 0; i < enic->intr_count; i++)
1615 vnic_intr_unmask(&enic->intr[i]);
1616
1617 enic_notify_timer_start(enic);
1618
1619 return 0;
1620
1621 err_out_notify_unset:
1622 enic_dev_notify_unset(enic);
1623 err_out_free_intr:
1624 enic_free_intr(enic);
1625
1626 return err;
1627 }
1628
1629 /* rtnl lock is held, process context */
1630 static int enic_stop(struct net_device *netdev)
1631 {
1632 struct enic *enic = netdev_priv(netdev);
1633 unsigned int i;
1634 int err;
1635
1636 for (i = 0; i < enic->intr_count; i++) {
1637 vnic_intr_mask(&enic->intr[i]);
1638 (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1639 }
1640
1641 enic_synchronize_irqs(enic);
1642
1643 del_timer_sync(&enic->notify_timer);
1644
1645 enic_dev_disable(enic);
1646
1647 for (i = 0; i < enic->rq_count; i++)
1648 napi_disable(&enic->napi[i]);
1649
1650 netif_carrier_off(netdev);
1651 netif_tx_disable(netdev);
1652 if (enic_is_dynamic(enic) && !is_zero_ether_addr(enic->pp.mac_addr))
1653 enic_dev_del_addr(enic, enic->pp.mac_addr);
1654 else
1655 enic_dev_del_station_addr(enic);
1656
1657 for (i = 0; i < enic->wq_count; i++) {
1658 err = vnic_wq_disable(&enic->wq[i]);
1659 if (err)
1660 return err;
1661 }
1662 for (i = 0; i < enic->rq_count; i++) {
1663 err = vnic_rq_disable(&enic->rq[i]);
1664 if (err)
1665 return err;
1666 }
1667
1668 enic_dev_notify_unset(enic);
1669 enic_free_intr(enic);
1670
1671 for (i = 0; i < enic->wq_count; i++)
1672 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1673 for (i = 0; i < enic->rq_count; i++)
1674 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1675 for (i = 0; i < enic->cq_count; i++)
1676 vnic_cq_clean(&enic->cq[i]);
1677 for (i = 0; i < enic->intr_count; i++)
1678 vnic_intr_clean(&enic->intr[i]);
1679
1680 return 0;
1681 }
1682
1683 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1684 {
1685 struct enic *enic = netdev_priv(netdev);
1686 int running = netif_running(netdev);
1687
1688 if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1689 return -EINVAL;
1690
1691 if (running)
1692 enic_stop(netdev);
1693
1694 netdev->mtu = new_mtu;
1695
1696 if (netdev->mtu > enic->port_mtu)
1697 netdev_warn(netdev,
1698 "interface MTU (%d) set higher than port MTU (%d)\n",
1699 netdev->mtu, enic->port_mtu);
1700
1701 if (running)
1702 enic_open(netdev);
1703
1704 return 0;
1705 }
1706
1707 #ifdef CONFIG_NET_POLL_CONTROLLER
1708 static void enic_poll_controller(struct net_device *netdev)
1709 {
1710 struct enic *enic = netdev_priv(netdev);
1711 struct vnic_dev *vdev = enic->vdev;
1712 unsigned int i, intr;
1713
1714 switch (vnic_dev_get_intr_mode(vdev)) {
1715 case VNIC_DEV_INTR_MODE_MSIX:
1716 for (i = 0; i < enic->rq_count; i++) {
1717 intr = enic_msix_rq_intr(enic, i);
1718 enic_isr_msix_rq(enic->msix_entry[intr].vector,
1719 &enic->napi[i]);
1720 }
1721 intr = enic_msix_wq_intr(enic, i);
1722 enic_isr_msix_wq(enic->msix_entry[intr].vector, enic);
1723 break;
1724 case VNIC_DEV_INTR_MODE_MSI:
1725 enic_isr_msi(enic->pdev->irq, enic);
1726 break;
1727 case VNIC_DEV_INTR_MODE_INTX:
1728 enic_isr_legacy(enic->pdev->irq, netdev);
1729 break;
1730 default:
1731 break;
1732 }
1733 }
1734 #endif
1735
1736 static int enic_dev_wait(struct vnic_dev *vdev,
1737 int (*start)(struct vnic_dev *, int),
1738 int (*finished)(struct vnic_dev *, int *),
1739 int arg)
1740 {
1741 unsigned long time;
1742 int done;
1743 int err;
1744
1745 BUG_ON(in_interrupt());
1746
1747 err = start(vdev, arg);
1748 if (err)
1749 return err;
1750
1751 /* Wait for func to complete...2 seconds max
1752 */
1753
1754 time = jiffies + (HZ * 2);
1755 do {
1756
1757 err = finished(vdev, &done);
1758 if (err)
1759 return err;
1760
1761 if (done)
1762 return 0;
1763
1764 schedule_timeout_uninterruptible(HZ / 10);
1765
1766 } while (time_after(time, jiffies));
1767
1768 return -ETIMEDOUT;
1769 }
1770
1771 static int enic_dev_open(struct enic *enic)
1772 {
1773 int err;
1774
1775 err = enic_dev_wait(enic->vdev, vnic_dev_open,
1776 vnic_dev_open_done, 0);
1777 if (err)
1778 dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
1779 err);
1780
1781 return err;
1782 }
1783
1784 static int enic_dev_hang_reset(struct enic *enic)
1785 {
1786 int err;
1787
1788 err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
1789 vnic_dev_hang_reset_done, 0);
1790 if (err)
1791 netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
1792 err);
1793
1794 return err;
1795 }
1796
1797 static int enic_set_rsskey(struct enic *enic)
1798 {
1799 dma_addr_t rss_key_buf_pa;
1800 union vnic_rss_key *rss_key_buf_va = NULL;
1801 union vnic_rss_key rss_key = {
1802 .key[0].b = {85, 67, 83, 97, 119, 101, 115, 111, 109, 101},
1803 .key[1].b = {80, 65, 76, 79, 117, 110, 105, 113, 117, 101},
1804 .key[2].b = {76, 73, 78, 85, 88, 114, 111, 99, 107, 115},
1805 .key[3].b = {69, 78, 73, 67, 105, 115, 99, 111, 111, 108},
1806 };
1807 int err;
1808
1809 rss_key_buf_va = pci_alloc_consistent(enic->pdev,
1810 sizeof(union vnic_rss_key), &rss_key_buf_pa);
1811 if (!rss_key_buf_va)
1812 return -ENOMEM;
1813
1814 memcpy(rss_key_buf_va, &rss_key, sizeof(union vnic_rss_key));
1815
1816 spin_lock(&enic->devcmd_lock);
1817 err = enic_set_rss_key(enic,
1818 rss_key_buf_pa,
1819 sizeof(union vnic_rss_key));
1820 spin_unlock(&enic->devcmd_lock);
1821
1822 pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
1823 rss_key_buf_va, rss_key_buf_pa);
1824
1825 return err;
1826 }
1827
1828 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
1829 {
1830 dma_addr_t rss_cpu_buf_pa;
1831 union vnic_rss_cpu *rss_cpu_buf_va = NULL;
1832 unsigned int i;
1833 int err;
1834
1835 rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
1836 sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
1837 if (!rss_cpu_buf_va)
1838 return -ENOMEM;
1839
1840 for (i = 0; i < (1 << rss_hash_bits); i++)
1841 (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
1842
1843 spin_lock(&enic->devcmd_lock);
1844 err = enic_set_rss_cpu(enic,
1845 rss_cpu_buf_pa,
1846 sizeof(union vnic_rss_cpu));
1847 spin_unlock(&enic->devcmd_lock);
1848
1849 pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
1850 rss_cpu_buf_va, rss_cpu_buf_pa);
1851
1852 return err;
1853 }
1854
1855 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
1856 u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
1857 {
1858 const u8 tso_ipid_split_en = 0;
1859 const u8 ig_vlan_strip_en = 1;
1860 int err;
1861
1862 /* Enable VLAN tag stripping.
1863 */
1864
1865 spin_lock(&enic->devcmd_lock);
1866 err = enic_set_nic_cfg(enic,
1867 rss_default_cpu, rss_hash_type,
1868 rss_hash_bits, rss_base_cpu,
1869 rss_enable, tso_ipid_split_en,
1870 ig_vlan_strip_en);
1871 spin_unlock(&enic->devcmd_lock);
1872
1873 return err;
1874 }
1875
1876 static int enic_set_rss_nic_cfg(struct enic *enic)
1877 {
1878 struct device *dev = enic_get_dev(enic);
1879 const u8 rss_default_cpu = 0;
1880 const u8 rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4 |
1881 NIC_CFG_RSS_HASH_TYPE_TCP_IPV4 |
1882 NIC_CFG_RSS_HASH_TYPE_IPV6 |
1883 NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
1884 const u8 rss_hash_bits = 7;
1885 const u8 rss_base_cpu = 0;
1886 u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
1887
1888 if (rss_enable) {
1889 if (!enic_set_rsskey(enic)) {
1890 if (enic_set_rsscpu(enic, rss_hash_bits)) {
1891 rss_enable = 0;
1892 dev_warn(dev, "RSS disabled, "
1893 "Failed to set RSS cpu indirection table.");
1894 }
1895 } else {
1896 rss_enable = 0;
1897 dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
1898 }
1899 }
1900
1901 return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
1902 rss_hash_bits, rss_base_cpu, rss_enable);
1903 }
1904
1905 static void enic_reset(struct work_struct *work)
1906 {
1907 struct enic *enic = container_of(work, struct enic, reset);
1908
1909 if (!netif_running(enic->netdev))
1910 return;
1911
1912 rtnl_lock();
1913
1914 enic_dev_hang_notify(enic);
1915 enic_stop(enic->netdev);
1916 enic_dev_hang_reset(enic);
1917 enic_reset_addr_lists(enic);
1918 enic_init_vnic_resources(enic);
1919 enic_set_rss_nic_cfg(enic);
1920 enic_dev_set_ig_vlan_rewrite_mode(enic);
1921 enic_open(enic->netdev);
1922
1923 rtnl_unlock();
1924 }
1925
1926 static int enic_set_intr_mode(struct enic *enic)
1927 {
1928 unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
1929 unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
1930 unsigned int i;
1931
1932 /* Set interrupt mode (INTx, MSI, MSI-X) depending
1933 * on system capabilities.
1934 *
1935 * Try MSI-X first
1936 *
1937 * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1938 * (the second to last INTR is used for WQ/RQ errors)
1939 * (the last INTR is used for notifications)
1940 */
1941
1942 BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1943 for (i = 0; i < n + m + 2; i++)
1944 enic->msix_entry[i].entry = i;
1945
1946 /* Use multiple RQs if RSS is enabled
1947 */
1948
1949 if (ENIC_SETTING(enic, RSS) &&
1950 enic->config.intr_mode < 1 &&
1951 enic->rq_count >= n &&
1952 enic->wq_count >= m &&
1953 enic->cq_count >= n + m &&
1954 enic->intr_count >= n + m + 2) {
1955
1956 if (!pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {
1957
1958 enic->rq_count = n;
1959 enic->wq_count = m;
1960 enic->cq_count = n + m;
1961 enic->intr_count = n + m + 2;
1962
1963 vnic_dev_set_intr_mode(enic->vdev,
1964 VNIC_DEV_INTR_MODE_MSIX);
1965
1966 return 0;
1967 }
1968 }
1969
1970 if (enic->config.intr_mode < 1 &&
1971 enic->rq_count >= 1 &&
1972 enic->wq_count >= m &&
1973 enic->cq_count >= 1 + m &&
1974 enic->intr_count >= 1 + m + 2) {
1975 if (!pci_enable_msix(enic->pdev, enic->msix_entry, 1 + m + 2)) {
1976
1977 enic->rq_count = 1;
1978 enic->wq_count = m;
1979 enic->cq_count = 1 + m;
1980 enic->intr_count = 1 + m + 2;
1981
1982 vnic_dev_set_intr_mode(enic->vdev,
1983 VNIC_DEV_INTR_MODE_MSIX);
1984
1985 return 0;
1986 }
1987 }
1988
1989 /* Next try MSI
1990 *
1991 * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
1992 */
1993
1994 if (enic->config.intr_mode < 2 &&
1995 enic->rq_count >= 1 &&
1996 enic->wq_count >= 1 &&
1997 enic->cq_count >= 2 &&
1998 enic->intr_count >= 1 &&
1999 !pci_enable_msi(enic->pdev)) {
2000
2001 enic->rq_count = 1;
2002 enic->wq_count = 1;
2003 enic->cq_count = 2;
2004 enic->intr_count = 1;
2005
2006 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2007
2008 return 0;
2009 }
2010
2011 /* Next try INTx
2012 *
2013 * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2014 * (the first INTR is used for WQ/RQ)
2015 * (the second INTR is used for WQ/RQ errors)
2016 * (the last INTR is used for notifications)
2017 */
2018
2019 if (enic->config.intr_mode < 3 &&
2020 enic->rq_count >= 1 &&
2021 enic->wq_count >= 1 &&
2022 enic->cq_count >= 2 &&
2023 enic->intr_count >= 3) {
2024
2025 enic->rq_count = 1;
2026 enic->wq_count = 1;
2027 enic->cq_count = 2;
2028 enic->intr_count = 3;
2029
2030 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2031
2032 return 0;
2033 }
2034
2035 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2036
2037 return -EINVAL;
2038 }
2039
2040 static void enic_clear_intr_mode(struct enic *enic)
2041 {
2042 switch (vnic_dev_get_intr_mode(enic->vdev)) {
2043 case VNIC_DEV_INTR_MODE_MSIX:
2044 pci_disable_msix(enic->pdev);
2045 break;
2046 case VNIC_DEV_INTR_MODE_MSI:
2047 pci_disable_msi(enic->pdev);
2048 break;
2049 default:
2050 break;
2051 }
2052
2053 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2054 }
2055
2056 static const struct net_device_ops enic_netdev_dynamic_ops = {
2057 .ndo_open = enic_open,
2058 .ndo_stop = enic_stop,
2059 .ndo_start_xmit = enic_hard_start_xmit,
2060 .ndo_get_stats = enic_get_stats,
2061 .ndo_validate_addr = eth_validate_addr,
2062 .ndo_set_rx_mode = enic_set_rx_mode,
2063 .ndo_set_multicast_list = enic_set_rx_mode,
2064 .ndo_set_mac_address = enic_set_mac_address_dynamic,
2065 .ndo_change_mtu = enic_change_mtu,
2066 .ndo_vlan_rx_register = enic_vlan_rx_register,
2067 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid,
2068 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid,
2069 .ndo_tx_timeout = enic_tx_timeout,
2070 .ndo_set_vf_port = enic_set_vf_port,
2071 .ndo_get_vf_port = enic_get_vf_port,
2072 .ndo_set_vf_mac = enic_set_vf_mac,
2073 #ifdef CONFIG_NET_POLL_CONTROLLER
2074 .ndo_poll_controller = enic_poll_controller,
2075 #endif
2076 };
2077
2078 static const struct net_device_ops enic_netdev_ops = {
2079 .ndo_open = enic_open,
2080 .ndo_stop = enic_stop,
2081 .ndo_start_xmit = enic_hard_start_xmit,
2082 .ndo_get_stats = enic_get_stats,
2083 .ndo_validate_addr = eth_validate_addr,
2084 .ndo_set_mac_address = enic_set_mac_address,
2085 .ndo_set_rx_mode = enic_set_rx_mode,
2086 .ndo_set_multicast_list = enic_set_rx_mode,
2087 .ndo_change_mtu = enic_change_mtu,
2088 .ndo_vlan_rx_register = enic_vlan_rx_register,
2089 .ndo_vlan_rx_add_vid = enic_vlan_rx_add_vid,
2090 .ndo_vlan_rx_kill_vid = enic_vlan_rx_kill_vid,
2091 .ndo_tx_timeout = enic_tx_timeout,
2092 #ifdef CONFIG_NET_POLL_CONTROLLER
2093 .ndo_poll_controller = enic_poll_controller,
2094 #endif
2095 };
2096
2097 static void enic_dev_deinit(struct enic *enic)
2098 {
2099 unsigned int i;
2100
2101 for (i = 0; i < enic->rq_count; i++)
2102 netif_napi_del(&enic->napi[i]);
2103
2104 enic_free_vnic_resources(enic);
2105 enic_clear_intr_mode(enic);
2106 }
2107
2108 static int enic_dev_init(struct enic *enic)
2109 {
2110 struct device *dev = enic_get_dev(enic);
2111 struct net_device *netdev = enic->netdev;
2112 unsigned int i;
2113 int err;
2114
2115 /* Get vNIC configuration
2116 */
2117
2118 err = enic_get_vnic_config(enic);
2119 if (err) {
2120 dev_err(dev, "Get vNIC configuration failed, aborting\n");
2121 return err;
2122 }
2123
2124 /* Get available resource counts
2125 */
2126
2127 enic_get_res_counts(enic);
2128
2129 /* Set interrupt mode based on resource counts and system
2130 * capabilities
2131 */
2132
2133 err = enic_set_intr_mode(enic);
2134 if (err) {
2135 dev_err(dev, "Failed to set intr mode based on resource "
2136 "counts and system capabilities, aborting\n");
2137 return err;
2138 }
2139
2140 /* Allocate and configure vNIC resources
2141 */
2142
2143 err = enic_alloc_vnic_resources(enic);
2144 if (err) {
2145 dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2146 goto err_out_free_vnic_resources;
2147 }
2148
2149 enic_init_vnic_resources(enic);
2150
2151 err = enic_set_rss_nic_cfg(enic);
2152 if (err) {
2153 dev_err(dev, "Failed to config nic, aborting\n");
2154 goto err_out_free_vnic_resources;
2155 }
2156
2157 switch (vnic_dev_get_intr_mode(enic->vdev)) {
2158 default:
2159 netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2160 break;
2161 case VNIC_DEV_INTR_MODE_MSIX:
2162 for (i = 0; i < enic->rq_count; i++)
2163 netif_napi_add(netdev, &enic->napi[i],
2164 enic_poll_msix, 64);
2165 break;
2166 }
2167
2168 return 0;
2169
2170 err_out_free_vnic_resources:
2171 enic_clear_intr_mode(enic);
2172 enic_free_vnic_resources(enic);
2173
2174 return err;
2175 }
2176
2177 static void enic_iounmap(struct enic *enic)
2178 {
2179 unsigned int i;
2180
2181 for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2182 if (enic->bar[i].vaddr)
2183 iounmap(enic->bar[i].vaddr);
2184 }
2185
2186 static int __devinit enic_probe(struct pci_dev *pdev,
2187 const struct pci_device_id *ent)
2188 {
2189 struct device *dev = &pdev->dev;
2190 struct net_device *netdev;
2191 struct enic *enic;
2192 int using_dac = 0;
2193 unsigned int i;
2194 int err;
2195
2196 /* Allocate net device structure and initialize. Private
2197 * instance data is initialized to zero.
2198 */
2199
2200 netdev = alloc_etherdev(sizeof(struct enic));
2201 if (!netdev) {
2202 pr_err("Etherdev alloc failed, aborting\n");
2203 return -ENOMEM;
2204 }
2205
2206 pci_set_drvdata(pdev, netdev);
2207
2208 SET_NETDEV_DEV(netdev, &pdev->dev);
2209
2210 enic = netdev_priv(netdev);
2211 enic->netdev = netdev;
2212 enic->pdev = pdev;
2213
2214 /* Setup PCI resources
2215 */
2216
2217 err = pci_enable_device_mem(pdev);
2218 if (err) {
2219 dev_err(dev, "Cannot enable PCI device, aborting\n");
2220 goto err_out_free_netdev;
2221 }
2222
2223 err = pci_request_regions(pdev, DRV_NAME);
2224 if (err) {
2225 dev_err(dev, "Cannot request PCI regions, aborting\n");
2226 goto err_out_disable_device;
2227 }
2228
2229 pci_set_master(pdev);
2230
2231 /* Query PCI controller on system for DMA addressing
2232 * limitation for the device. Try 40-bit first, and
2233 * fail to 32-bit.
2234 */
2235
2236 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(40));
2237 if (err) {
2238 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2239 if (err) {
2240 dev_err(dev, "No usable DMA configuration, aborting\n");
2241 goto err_out_release_regions;
2242 }
2243 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2244 if (err) {
2245 dev_err(dev, "Unable to obtain %u-bit DMA "
2246 "for consistent allocations, aborting\n", 32);
2247 goto err_out_release_regions;
2248 }
2249 } else {
2250 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(40));
2251 if (err) {
2252 dev_err(dev, "Unable to obtain %u-bit DMA "
2253 "for consistent allocations, aborting\n", 40);
2254 goto err_out_release_regions;
2255 }
2256 using_dac = 1;
2257 }
2258
2259 /* Map vNIC resources from BAR0-5
2260 */
2261
2262 for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2263 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2264 continue;
2265 enic->bar[i].len = pci_resource_len(pdev, i);
2266 enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2267 if (!enic->bar[i].vaddr) {
2268 dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2269 err = -ENODEV;
2270 goto err_out_iounmap;
2271 }
2272 enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2273 }
2274
2275 /* Register vNIC device
2276 */
2277
2278 enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2279 ARRAY_SIZE(enic->bar));
2280 if (!enic->vdev) {
2281 dev_err(dev, "vNIC registration failed, aborting\n");
2282 err = -ENODEV;
2283 goto err_out_iounmap;
2284 }
2285
2286 /* Issue device open to get device in known state
2287 */
2288
2289 err = enic_dev_open(enic);
2290 if (err) {
2291 dev_err(dev, "vNIC dev open failed, aborting\n");
2292 goto err_out_vnic_unregister;
2293 }
2294
2295 /* Setup devcmd lock
2296 */
2297
2298 spin_lock_init(&enic->devcmd_lock);
2299
2300 /*
2301 * Set ingress vlan rewrite mode before vnic initialization
2302 */
2303
2304 err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2305 if (err) {
2306 dev_err(dev,
2307 "Failed to set ingress vlan rewrite mode, aborting.\n");
2308 goto err_out_dev_close;
2309 }
2310
2311 /* Issue device init to initialize the vnic-to-switch link.
2312 * We'll start with carrier off and wait for link UP
2313 * notification later to turn on carrier. We don't need
2314 * to wait here for the vnic-to-switch link initialization
2315 * to complete; link UP notification is the indication that
2316 * the process is complete.
2317 */
2318
2319 netif_carrier_off(netdev);
2320
2321 /* Do not call dev_init for a dynamic vnic.
2322 * For a dynamic vnic, init_prov_info will be
2323 * called later by an upper layer.
2324 */
2325
2326 if (!enic_is_dynamic(enic)) {
2327 err = vnic_dev_init(enic->vdev, 0);
2328 if (err) {
2329 dev_err(dev, "vNIC dev init failed, aborting\n");
2330 goto err_out_dev_close;
2331 }
2332 }
2333
2334 err = enic_dev_init(enic);
2335 if (err) {
2336 dev_err(dev, "Device initialization failed, aborting\n");
2337 goto err_out_dev_close;
2338 }
2339
2340 /* Setup notification timer, HW reset task, and wq locks
2341 */
2342
2343 init_timer(&enic->notify_timer);
2344 enic->notify_timer.function = enic_notify_timer;
2345 enic->notify_timer.data = (unsigned long)enic;
2346
2347 INIT_WORK(&enic->reset, enic_reset);
2348
2349 for (i = 0; i < enic->wq_count; i++)
2350 spin_lock_init(&enic->wq_lock[i]);
2351
2352 /* Register net device
2353 */
2354
2355 enic->port_mtu = enic->config.mtu;
2356 (void)enic_change_mtu(netdev, enic->port_mtu);
2357
2358 err = enic_set_mac_addr(netdev, enic->mac_addr);
2359 if (err) {
2360 dev_err(dev, "Invalid MAC address, aborting\n");
2361 goto err_out_dev_deinit;
2362 }
2363
2364 enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2365 enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2366
2367 if (enic_is_dynamic(enic))
2368 netdev->netdev_ops = &enic_netdev_dynamic_ops;
2369 else
2370 netdev->netdev_ops = &enic_netdev_ops;
2371
2372 netdev->watchdog_timeo = 2 * HZ;
2373 netdev->ethtool_ops = &enic_ethtool_ops;
2374
2375 netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
2376 if (ENIC_SETTING(enic, LOOP)) {
2377 netdev->features &= ~NETIF_F_HW_VLAN_TX;
2378 enic->loop_enable = 1;
2379 enic->loop_tag = enic->config.loop_tag;
2380 dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2381 }
2382 if (ENIC_SETTING(enic, TXCSUM))
2383 netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2384 if (ENIC_SETTING(enic, TSO))
2385 netdev->hw_features |= NETIF_F_TSO |
2386 NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2387 if (ENIC_SETTING(enic, RXCSUM))
2388 netdev->hw_features |= NETIF_F_RXCSUM;
2389
2390 netdev->features |= netdev->hw_features;
2391
2392 if (using_dac)
2393 netdev->features |= NETIF_F_HIGHDMA;
2394
2395 err = register_netdev(netdev);
2396 if (err) {
2397 dev_err(dev, "Cannot register net device, aborting\n");
2398 goto err_out_dev_deinit;
2399 }
2400
2401 return 0;
2402
2403 err_out_dev_deinit:
2404 enic_dev_deinit(enic);
2405 err_out_dev_close:
2406 vnic_dev_close(enic->vdev);
2407 err_out_vnic_unregister:
2408 vnic_dev_unregister(enic->vdev);
2409 err_out_iounmap:
2410 enic_iounmap(enic);
2411 err_out_release_regions:
2412 pci_release_regions(pdev);
2413 err_out_disable_device:
2414 pci_disable_device(pdev);
2415 err_out_free_netdev:
2416 pci_set_drvdata(pdev, NULL);
2417 free_netdev(netdev);
2418
2419 return err;
2420 }
2421
2422 static void __devexit enic_remove(struct pci_dev *pdev)
2423 {
2424 struct net_device *netdev = pci_get_drvdata(pdev);
2425
2426 if (netdev) {
2427 struct enic *enic = netdev_priv(netdev);
2428
2429 cancel_work_sync(&enic->reset);
2430 unregister_netdev(netdev);
2431 enic_dev_deinit(enic);
2432 vnic_dev_close(enic->vdev);
2433 vnic_dev_unregister(enic->vdev);
2434 enic_iounmap(enic);
2435 pci_release_regions(pdev);
2436 pci_disable_device(pdev);
2437 pci_set_drvdata(pdev, NULL);
2438 free_netdev(netdev);
2439 }
2440 }
2441
2442 static struct pci_driver enic_driver = {
2443 .name = DRV_NAME,
2444 .id_table = enic_id_table,
2445 .probe = enic_probe,
2446 .remove = __devexit_p(enic_remove),
2447 };
2448
2449 static int __init enic_init_module(void)
2450 {
2451 pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
2452
2453 return pci_register_driver(&enic_driver);
2454 }
2455
2456 static void __exit enic_cleanup_module(void)
2457 {
2458 pci_unregister_driver(&enic_driver);
2459 }
2460
2461 module_init(enic_init_module);
2462 module_exit(enic_cleanup_module);
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