Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
[linux-2.6] / drivers / net / enic / enic_main.c
1 /*
2  * Copyright 2008 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 <net/ip6_checksum.h>
38
39 #include "cq_enet_desc.h"
40 #include "vnic_dev.h"
41 #include "vnic_intr.h"
42 #include "vnic_stats.h"
43 #include "enic_res.h"
44 #include "enic.h"
45
46 #define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
47
48 /* Supported devices */
49 static struct pci_device_id enic_id_table[] = {
50         { PCI_VDEVICE(CISCO, 0x0043) },
51         { 0, }  /* end of table */
52 };
53
54 MODULE_DESCRIPTION(DRV_DESCRIPTION);
55 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
56 MODULE_LICENSE("GPL");
57 MODULE_VERSION(DRV_VERSION);
58 MODULE_DEVICE_TABLE(pci, enic_id_table);
59
60 struct enic_stat {
61         char name[ETH_GSTRING_LEN];
62         unsigned int offset;
63 };
64
65 #define ENIC_TX_STAT(stat)      \
66         { .name = #stat, .offset = offsetof(struct vnic_tx_stats, stat) / 8 }
67 #define ENIC_RX_STAT(stat)      \
68         { .name = #stat, .offset = offsetof(struct vnic_rx_stats, stat) / 8 }
69
70 static const struct enic_stat enic_tx_stats[] = {
71         ENIC_TX_STAT(tx_frames_ok),
72         ENIC_TX_STAT(tx_unicast_frames_ok),
73         ENIC_TX_STAT(tx_multicast_frames_ok),
74         ENIC_TX_STAT(tx_broadcast_frames_ok),
75         ENIC_TX_STAT(tx_bytes_ok),
76         ENIC_TX_STAT(tx_unicast_bytes_ok),
77         ENIC_TX_STAT(tx_multicast_bytes_ok),
78         ENIC_TX_STAT(tx_broadcast_bytes_ok),
79         ENIC_TX_STAT(tx_drops),
80         ENIC_TX_STAT(tx_errors),
81         ENIC_TX_STAT(tx_tso),
82 };
83
84 static const struct enic_stat enic_rx_stats[] = {
85         ENIC_RX_STAT(rx_frames_ok),
86         ENIC_RX_STAT(rx_frames_total),
87         ENIC_RX_STAT(rx_unicast_frames_ok),
88         ENIC_RX_STAT(rx_multicast_frames_ok),
89         ENIC_RX_STAT(rx_broadcast_frames_ok),
90         ENIC_RX_STAT(rx_bytes_ok),
91         ENIC_RX_STAT(rx_unicast_bytes_ok),
92         ENIC_RX_STAT(rx_multicast_bytes_ok),
93         ENIC_RX_STAT(rx_broadcast_bytes_ok),
94         ENIC_RX_STAT(rx_drop),
95         ENIC_RX_STAT(rx_no_bufs),
96         ENIC_RX_STAT(rx_errors),
97         ENIC_RX_STAT(rx_rss),
98         ENIC_RX_STAT(rx_crc_errors),
99         ENIC_RX_STAT(rx_frames_64),
100         ENIC_RX_STAT(rx_frames_127),
101         ENIC_RX_STAT(rx_frames_255),
102         ENIC_RX_STAT(rx_frames_511),
103         ENIC_RX_STAT(rx_frames_1023),
104         ENIC_RX_STAT(rx_frames_1518),
105         ENIC_RX_STAT(rx_frames_to_max),
106 };
107
108 static const unsigned int enic_n_tx_stats = ARRAY_SIZE(enic_tx_stats);
109 static const unsigned int enic_n_rx_stats = ARRAY_SIZE(enic_rx_stats);
110
111 static int enic_get_settings(struct net_device *netdev,
112         struct ethtool_cmd *ecmd)
113 {
114         struct enic *enic = netdev_priv(netdev);
115
116         ecmd->supported = (SUPPORTED_10000baseT_Full | SUPPORTED_FIBRE);
117         ecmd->advertising = (ADVERTISED_10000baseT_Full | ADVERTISED_FIBRE);
118         ecmd->port = PORT_FIBRE;
119         ecmd->transceiver = XCVR_EXTERNAL;
120
121         if (netif_carrier_ok(netdev)) {
122                 ecmd->speed = vnic_dev_port_speed(enic->vdev);
123                 ecmd->duplex = DUPLEX_FULL;
124         } else {
125                 ecmd->speed = -1;
126                 ecmd->duplex = -1;
127         }
128
129         ecmd->autoneg = AUTONEG_DISABLE;
130
131         return 0;
132 }
133
134 static void enic_get_drvinfo(struct net_device *netdev,
135         struct ethtool_drvinfo *drvinfo)
136 {
137         struct enic *enic = netdev_priv(netdev);
138         struct vnic_devcmd_fw_info *fw_info;
139
140         spin_lock(&enic->devcmd_lock);
141         vnic_dev_fw_info(enic->vdev, &fw_info);
142         spin_unlock(&enic->devcmd_lock);
143
144         strncpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
145         strncpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
146         strncpy(drvinfo->fw_version, fw_info->fw_version,
147                 sizeof(drvinfo->fw_version));
148         strncpy(drvinfo->bus_info, pci_name(enic->pdev),
149                 sizeof(drvinfo->bus_info));
150 }
151
152 static void enic_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
153 {
154         unsigned int i;
155
156         switch (stringset) {
157         case ETH_SS_STATS:
158                 for (i = 0; i < enic_n_tx_stats; i++) {
159                         memcpy(data, enic_tx_stats[i].name, ETH_GSTRING_LEN);
160                         data += ETH_GSTRING_LEN;
161                 }
162                 for (i = 0; i < enic_n_rx_stats; i++) {
163                         memcpy(data, enic_rx_stats[i].name, ETH_GSTRING_LEN);
164                         data += ETH_GSTRING_LEN;
165                 }
166                 break;
167         }
168 }
169
170 static int enic_get_sset_count(struct net_device *netdev, int sset)
171 {
172         switch (sset) {
173         case ETH_SS_STATS:
174                 return enic_n_tx_stats + enic_n_rx_stats;
175         default:
176                 return -EOPNOTSUPP;
177         }
178 }
179
180 static void enic_get_ethtool_stats(struct net_device *netdev,
181         struct ethtool_stats *stats, u64 *data)
182 {
183         struct enic *enic = netdev_priv(netdev);
184         struct vnic_stats *vstats;
185         unsigned int i;
186
187         spin_lock(&enic->devcmd_lock);
188         vnic_dev_stats_dump(enic->vdev, &vstats);
189         spin_unlock(&enic->devcmd_lock);
190
191         for (i = 0; i < enic_n_tx_stats; i++)
192                 *(data++) = ((u64 *)&vstats->tx)[enic_tx_stats[i].offset];
193         for (i = 0; i < enic_n_rx_stats; i++)
194                 *(data++) = ((u64 *)&vstats->rx)[enic_rx_stats[i].offset];
195 }
196
197 static u32 enic_get_rx_csum(struct net_device *netdev)
198 {
199         struct enic *enic = netdev_priv(netdev);
200         return enic->csum_rx_enabled;
201 }
202
203 static int enic_set_rx_csum(struct net_device *netdev, u32 data)
204 {
205         struct enic *enic = netdev_priv(netdev);
206
207         if (data && !ENIC_SETTING(enic, RXCSUM))
208                 return -EINVAL;
209
210         enic->csum_rx_enabled = !!data;
211
212         return 0;
213 }
214
215 static int enic_set_tx_csum(struct net_device *netdev, u32 data)
216 {
217         struct enic *enic = netdev_priv(netdev);
218
219         if (data && !ENIC_SETTING(enic, TXCSUM))
220                 return -EINVAL;
221
222         if (data)
223                 netdev->features |= NETIF_F_HW_CSUM;
224         else
225                 netdev->features &= ~NETIF_F_HW_CSUM;
226
227         return 0;
228 }
229
230 static int enic_set_tso(struct net_device *netdev, u32 data)
231 {
232         struct enic *enic = netdev_priv(netdev);
233
234         if (data && !ENIC_SETTING(enic, TSO))
235                 return -EINVAL;
236
237         if (data)
238                 netdev->features |=
239                         NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN;
240         else
241                 netdev->features &=
242                         ~(NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_TSO_ECN);
243
244         return 0;
245 }
246
247 static u32 enic_get_msglevel(struct net_device *netdev)
248 {
249         struct enic *enic = netdev_priv(netdev);
250         return enic->msg_enable;
251 }
252
253 static void enic_set_msglevel(struct net_device *netdev, u32 value)
254 {
255         struct enic *enic = netdev_priv(netdev);
256         enic->msg_enable = value;
257 }
258
259 static struct ethtool_ops enic_ethtool_ops = {
260         .get_settings = enic_get_settings,
261         .get_drvinfo = enic_get_drvinfo,
262         .get_msglevel = enic_get_msglevel,
263         .set_msglevel = enic_set_msglevel,
264         .get_link = ethtool_op_get_link,
265         .get_strings = enic_get_strings,
266         .get_sset_count = enic_get_sset_count,
267         .get_ethtool_stats = enic_get_ethtool_stats,
268         .get_rx_csum = enic_get_rx_csum,
269         .set_rx_csum = enic_set_rx_csum,
270         .get_tx_csum = ethtool_op_get_tx_csum,
271         .set_tx_csum = enic_set_tx_csum,
272         .get_sg = ethtool_op_get_sg,
273         .set_sg = ethtool_op_set_sg,
274         .get_tso = ethtool_op_get_tso,
275         .set_tso = enic_set_tso,
276         .get_flags = ethtool_op_get_flags,
277         .set_flags = ethtool_op_set_flags,
278 };
279
280 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
281 {
282         struct enic *enic = vnic_dev_priv(wq->vdev);
283
284         if (buf->sop)
285                 pci_unmap_single(enic->pdev, buf->dma_addr,
286                         buf->len, PCI_DMA_TODEVICE);
287         else
288                 pci_unmap_page(enic->pdev, buf->dma_addr,
289                         buf->len, PCI_DMA_TODEVICE);
290
291         if (buf->os_buf)
292                 dev_kfree_skb_any(buf->os_buf);
293 }
294
295 static void enic_wq_free_buf(struct vnic_wq *wq,
296         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
297 {
298         enic_free_wq_buf(wq, buf);
299 }
300
301 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
302         u8 type, u16 q_number, u16 completed_index, void *opaque)
303 {
304         struct enic *enic = vnic_dev_priv(vdev);
305
306         spin_lock(&enic->wq_lock[q_number]);
307
308         vnic_wq_service(&enic->wq[q_number], cq_desc,
309                 completed_index, enic_wq_free_buf,
310                 opaque);
311
312         if (netif_queue_stopped(enic->netdev) &&
313             vnic_wq_desc_avail(&enic->wq[q_number]) >= MAX_SKB_FRAGS + 1)
314                 netif_wake_queue(enic->netdev);
315
316         spin_unlock(&enic->wq_lock[q_number]);
317
318         return 0;
319 }
320
321 static void enic_log_q_error(struct enic *enic)
322 {
323         unsigned int i;
324         u32 error_status;
325
326         for (i = 0; i < enic->wq_count; i++) {
327                 error_status = vnic_wq_error_status(&enic->wq[i]);
328                 if (error_status)
329                         printk(KERN_ERR PFX "%s: WQ[%d] error_status %d\n",
330                                 enic->netdev->name, i, error_status);
331         }
332
333         for (i = 0; i < enic->rq_count; i++) {
334                 error_status = vnic_rq_error_status(&enic->rq[i]);
335                 if (error_status)
336                         printk(KERN_ERR PFX "%s: RQ[%d] error_status %d\n",
337                                 enic->netdev->name, i, error_status);
338         }
339 }
340
341 static void enic_link_check(struct enic *enic)
342 {
343         int link_status = vnic_dev_link_status(enic->vdev);
344         int carrier_ok = netif_carrier_ok(enic->netdev);
345
346         if (link_status && !carrier_ok) {
347                 printk(KERN_INFO PFX "%s: Link UP\n", enic->netdev->name);
348                 netif_carrier_on(enic->netdev);
349         } else if (!link_status && carrier_ok) {
350                 printk(KERN_INFO PFX "%s: Link DOWN\n", enic->netdev->name);
351                 netif_carrier_off(enic->netdev);
352         }
353 }
354
355 static void enic_mtu_check(struct enic *enic)
356 {
357         u32 mtu = vnic_dev_mtu(enic->vdev);
358
359         if (mtu != enic->port_mtu) {
360                 if (mtu < enic->netdev->mtu)
361                         printk(KERN_WARNING PFX
362                                 "%s: interface MTU (%d) set higher "
363                                 "than switch port MTU (%d)\n",
364                                 enic->netdev->name, enic->netdev->mtu, mtu);
365                 enic->port_mtu = mtu;
366         }
367 }
368
369 static void enic_msglvl_check(struct enic *enic)
370 {
371         u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
372
373         if (msg_enable != enic->msg_enable) {
374                 printk(KERN_INFO PFX "%s: msg lvl changed from 0x%x to 0x%x\n",
375                         enic->netdev->name, enic->msg_enable, msg_enable);
376                 enic->msg_enable = msg_enable;
377         }
378 }
379
380 static void enic_notify_check(struct enic *enic)
381 {
382         enic_msglvl_check(enic);
383         enic_mtu_check(enic);
384         enic_link_check(enic);
385 }
386
387 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
388
389 static irqreturn_t enic_isr_legacy(int irq, void *data)
390 {
391         struct net_device *netdev = data;
392         struct enic *enic = netdev_priv(netdev);
393         u32 pba;
394
395         vnic_intr_mask(&enic->intr[ENIC_INTX_WQ_RQ]);
396
397         pba = vnic_intr_legacy_pba(enic->legacy_pba);
398         if (!pba) {
399                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
400                 return IRQ_NONE;        /* not our interrupt */
401         }
402
403         if (ENIC_TEST_INTR(pba, ENIC_INTX_NOTIFY)) {
404                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_NOTIFY]);
405                 enic_notify_check(enic);
406         }
407
408         if (ENIC_TEST_INTR(pba, ENIC_INTX_ERR)) {
409                 vnic_intr_return_all_credits(&enic->intr[ENIC_INTX_ERR]);
410                 enic_log_q_error(enic);
411                 /* schedule recovery from WQ/RQ error */
412                 schedule_work(&enic->reset);
413                 return IRQ_HANDLED;
414         }
415
416         if (ENIC_TEST_INTR(pba, ENIC_INTX_WQ_RQ)) {
417                 if (napi_schedule_prep(&enic->napi))
418                         __napi_schedule(&enic->napi);
419         } else {
420                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
421         }
422
423         return IRQ_HANDLED;
424 }
425
426 static irqreturn_t enic_isr_msi(int irq, void *data)
427 {
428         struct enic *enic = data;
429
430         /* With MSI, there is no sharing of interrupts, so this is
431          * our interrupt and there is no need to ack it.  The device
432          * is not providing per-vector masking, so the OS will not
433          * write to PCI config space to mask/unmask the interrupt.
434          * We're using mask_on_assertion for MSI, so the device
435          * automatically masks the interrupt when the interrupt is
436          * generated.  Later, when exiting polling, the interrupt
437          * will be unmasked (see enic_poll).
438          *
439          * Also, the device uses the same PCIe Traffic Class (TC)
440          * for Memory Write data and MSI, so there are no ordering
441          * issues; the MSI will always arrive at the Root Complex
442          * _after_ corresponding Memory Writes (i.e. descriptor
443          * writes).
444          */
445
446         napi_schedule(&enic->napi);
447
448         return IRQ_HANDLED;
449 }
450
451 static irqreturn_t enic_isr_msix_rq(int irq, void *data)
452 {
453         struct enic *enic = data;
454
455         /* schedule NAPI polling for RQ cleanup */
456         napi_schedule(&enic->napi);
457
458         return IRQ_HANDLED;
459 }
460
461 static irqreturn_t enic_isr_msix_wq(int irq, void *data)
462 {
463         struct enic *enic = data;
464         unsigned int wq_work_to_do = -1; /* no limit */
465         unsigned int wq_work_done;
466
467         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
468                 wq_work_to_do, enic_wq_service, NULL);
469
470         vnic_intr_return_credits(&enic->intr[ENIC_MSIX_WQ],
471                 wq_work_done,
472                 1 /* unmask intr */,
473                 1 /* reset intr timer */);
474
475         return IRQ_HANDLED;
476 }
477
478 static irqreturn_t enic_isr_msix_err(int irq, void *data)
479 {
480         struct enic *enic = data;
481
482         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_ERR]);
483
484         enic_log_q_error(enic);
485
486         /* schedule recovery from WQ/RQ error */
487         schedule_work(&enic->reset);
488
489         return IRQ_HANDLED;
490 }
491
492 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
493 {
494         struct enic *enic = data;
495
496         vnic_intr_return_all_credits(&enic->intr[ENIC_MSIX_NOTIFY]);
497         enic_notify_check(enic);
498
499         return IRQ_HANDLED;
500 }
501
502 static inline void enic_queue_wq_skb_cont(struct enic *enic,
503         struct vnic_wq *wq, struct sk_buff *skb,
504         unsigned int len_left)
505 {
506         skb_frag_t *frag;
507
508         /* Queue additional data fragments */
509         for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
510                 len_left -= frag->size;
511                 enic_queue_wq_desc_cont(wq, skb,
512                         pci_map_page(enic->pdev, frag->page,
513                                 frag->page_offset, frag->size,
514                                 PCI_DMA_TODEVICE),
515                         frag->size,
516                         (len_left == 0));       /* EOP? */
517         }
518 }
519
520 static inline void enic_queue_wq_skb_vlan(struct enic *enic,
521         struct vnic_wq *wq, struct sk_buff *skb,
522         int vlan_tag_insert, unsigned int vlan_tag)
523 {
524         unsigned int head_len = skb_headlen(skb);
525         unsigned int len_left = skb->len - head_len;
526         int eop = (len_left == 0);
527
528         /* Queue the main skb fragment */
529         enic_queue_wq_desc(wq, skb,
530                 pci_map_single(enic->pdev, skb->data,
531                         head_len, PCI_DMA_TODEVICE),
532                 head_len,
533                 vlan_tag_insert, vlan_tag,
534                 eop);
535
536         if (!eop)
537                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
538 }
539
540 static inline void enic_queue_wq_skb_csum_l4(struct enic *enic,
541         struct vnic_wq *wq, struct sk_buff *skb,
542         int vlan_tag_insert, unsigned int vlan_tag)
543 {
544         unsigned int head_len = skb_headlen(skb);
545         unsigned int len_left = skb->len - head_len;
546         unsigned int hdr_len = skb_transport_offset(skb);
547         unsigned int csum_offset = hdr_len + skb->csum_offset;
548         int eop = (len_left == 0);
549
550         /* Queue the main skb fragment */
551         enic_queue_wq_desc_csum_l4(wq, skb,
552                 pci_map_single(enic->pdev, skb->data,
553                         head_len, PCI_DMA_TODEVICE),
554                 head_len,
555                 csum_offset,
556                 hdr_len,
557                 vlan_tag_insert, vlan_tag,
558                 eop);
559
560         if (!eop)
561                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
562 }
563
564 static inline void enic_queue_wq_skb_tso(struct enic *enic,
565         struct vnic_wq *wq, struct sk_buff *skb, unsigned int mss,
566         int vlan_tag_insert, unsigned int vlan_tag)
567 {
568         unsigned int head_len = skb_headlen(skb);
569         unsigned int len_left = skb->len - head_len;
570         unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
571         int eop = (len_left == 0);
572
573         /* Preload TCP csum field with IP pseudo hdr calculated
574          * with IP length set to zero.  HW will later add in length
575          * to each TCP segment resulting from the TSO.
576          */
577
578         if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
579                 ip_hdr(skb)->check = 0;
580                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
581                         ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
582         } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
583                 tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
584                         &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
585         }
586
587         /* Queue the main skb fragment */
588         enic_queue_wq_desc_tso(wq, skb,
589                 pci_map_single(enic->pdev, skb->data,
590                         head_len, PCI_DMA_TODEVICE),
591                 head_len,
592                 mss, hdr_len,
593                 vlan_tag_insert, vlan_tag,
594                 eop);
595
596         if (!eop)
597                 enic_queue_wq_skb_cont(enic, wq, skb, len_left);
598 }
599
600 static inline void enic_queue_wq_skb(struct enic *enic,
601         struct vnic_wq *wq, struct sk_buff *skb)
602 {
603         unsigned int mss = skb_shinfo(skb)->gso_size;
604         unsigned int vlan_tag = 0;
605         int vlan_tag_insert = 0;
606
607         if (enic->vlan_group && vlan_tx_tag_present(skb)) {
608                 /* VLAN tag from trunking driver */
609                 vlan_tag_insert = 1;
610                 vlan_tag = vlan_tx_tag_get(skb);
611         }
612
613         if (mss)
614                 enic_queue_wq_skb_tso(enic, wq, skb, mss,
615                         vlan_tag_insert, vlan_tag);
616         else if (skb->ip_summed == CHECKSUM_PARTIAL)
617                 enic_queue_wq_skb_csum_l4(enic, wq, skb,
618                         vlan_tag_insert, vlan_tag);
619         else
620                 enic_queue_wq_skb_vlan(enic, wq, skb,
621                         vlan_tag_insert, vlan_tag);
622 }
623
624 /* netif_tx_lock held, process context with BHs disabled, or BH */
625 static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
626 {
627         struct enic *enic = netdev_priv(netdev);
628         struct vnic_wq *wq = &enic->wq[0];
629         unsigned long flags;
630
631         if (skb->len <= 0) {
632                 dev_kfree_skb(skb);
633                 return NETDEV_TX_OK;
634         }
635
636         /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
637          * which is very likely.  In the off chance it's going to take
638          * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
639          */
640
641         if (skb_shinfo(skb)->gso_size == 0 &&
642             skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
643             skb_linearize(skb)) {
644                 dev_kfree_skb(skb);
645                 return NETDEV_TX_OK;
646         }
647
648         spin_lock_irqsave(&enic->wq_lock[0], flags);
649
650         if (vnic_wq_desc_avail(wq) < skb_shinfo(skb)->nr_frags + 1) {
651                 netif_stop_queue(netdev);
652                 /* This is a hard error, log it */
653                 printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
654                         "queue awake!\n", netdev->name);
655                 spin_unlock_irqrestore(&enic->wq_lock[0], flags);
656                 return NETDEV_TX_BUSY;
657         }
658
659         enic_queue_wq_skb(enic, wq, skb);
660
661         if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + 1)
662                 netif_stop_queue(netdev);
663
664         netdev->trans_start = jiffies;
665
666         spin_unlock_irqrestore(&enic->wq_lock[0], flags);
667
668         return NETDEV_TX_OK;
669 }
670
671 /* dev_base_lock rwlock held, nominally process context */
672 static struct net_device_stats *enic_get_stats(struct net_device *netdev)
673 {
674         struct enic *enic = netdev_priv(netdev);
675         struct net_device_stats *net_stats = &netdev->stats;
676         struct vnic_stats *stats;
677
678         spin_lock(&enic->devcmd_lock);
679         vnic_dev_stats_dump(enic->vdev, &stats);
680         spin_unlock(&enic->devcmd_lock);
681
682         net_stats->tx_packets = stats->tx.tx_frames_ok;
683         net_stats->tx_bytes = stats->tx.tx_bytes_ok;
684         net_stats->tx_errors = stats->tx.tx_errors;
685         net_stats->tx_dropped = stats->tx.tx_drops;
686
687         net_stats->rx_packets = stats->rx.rx_frames_ok;
688         net_stats->rx_bytes = stats->rx.rx_bytes_ok;
689         net_stats->rx_errors = stats->rx.rx_errors;
690         net_stats->multicast = stats->rx.rx_multicast_frames_ok;
691         net_stats->rx_crc_errors = enic->rq_bad_fcs;
692         net_stats->rx_dropped = stats->rx.rx_no_bufs;
693
694         return net_stats;
695 }
696
697 static void enic_reset_mcaddrs(struct enic *enic)
698 {
699         enic->mc_count = 0;
700 }
701
702 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
703 {
704         if (!is_valid_ether_addr(addr))
705                 return -EADDRNOTAVAIL;
706
707         memcpy(netdev->dev_addr, addr, netdev->addr_len);
708
709         return 0;
710 }
711
712 /* netif_tx_lock held, BHs disabled */
713 static void enic_set_multicast_list(struct net_device *netdev)
714 {
715         struct enic *enic = netdev_priv(netdev);
716         struct dev_mc_list *list = netdev->mc_list;
717         int directed = 1;
718         int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
719         int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
720         int promisc = (netdev->flags & IFF_PROMISC) ? 1 : 0;
721         int allmulti = (netdev->flags & IFF_ALLMULTI) ||
722             (netdev->mc_count > ENIC_MULTICAST_PERFECT_FILTERS);
723         u8 mc_addr[ENIC_MULTICAST_PERFECT_FILTERS][ETH_ALEN];
724         unsigned int mc_count = netdev->mc_count;
725         unsigned int i, j;
726
727         if (mc_count > ENIC_MULTICAST_PERFECT_FILTERS)
728                 mc_count = ENIC_MULTICAST_PERFECT_FILTERS;
729
730         spin_lock(&enic->devcmd_lock);
731
732         vnic_dev_packet_filter(enic->vdev, directed,
733                 multicast, broadcast, promisc, allmulti);
734
735         /* Is there an easier way?  Trying to minimize to
736          * calls to add/del multicast addrs.  We keep the
737          * addrs from the last call in enic->mc_addr and
738          * look for changes to add/del.
739          */
740
741         for (i = 0; list && i < mc_count; i++) {
742                 memcpy(mc_addr[i], list->dmi_addr, ETH_ALEN);
743                 list = list->next;
744         }
745
746         for (i = 0; i < enic->mc_count; i++) {
747                 for (j = 0; j < mc_count; j++)
748                         if (compare_ether_addr(enic->mc_addr[i],
749                                 mc_addr[j]) == 0)
750                                 break;
751                 if (j == mc_count)
752                         enic_del_multicast_addr(enic, enic->mc_addr[i]);
753         }
754
755         for (i = 0; i < mc_count; i++) {
756                 for (j = 0; j < enic->mc_count; j++)
757                         if (compare_ether_addr(mc_addr[i],
758                                 enic->mc_addr[j]) == 0)
759                                 break;
760                 if (j == enic->mc_count)
761                         enic_add_multicast_addr(enic, mc_addr[i]);
762         }
763
764         /* Save the list to compare against next time
765          */
766
767         for (i = 0; i < mc_count; i++)
768                 memcpy(enic->mc_addr[i], mc_addr[i], ETH_ALEN);
769
770         enic->mc_count = mc_count;
771
772         spin_unlock(&enic->devcmd_lock);
773 }
774
775 /* rtnl lock is held */
776 static void enic_vlan_rx_register(struct net_device *netdev,
777         struct vlan_group *vlan_group)
778 {
779         struct enic *enic = netdev_priv(netdev);
780         enic->vlan_group = vlan_group;
781 }
782
783 /* rtnl lock is held */
784 static void enic_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
785 {
786         struct enic *enic = netdev_priv(netdev);
787
788         spin_lock(&enic->devcmd_lock);
789         enic_add_vlan(enic, vid);
790         spin_unlock(&enic->devcmd_lock);
791 }
792
793 /* rtnl lock is held */
794 static void enic_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
795 {
796         struct enic *enic = netdev_priv(netdev);
797
798         spin_lock(&enic->devcmd_lock);
799         enic_del_vlan(enic, vid);
800         spin_unlock(&enic->devcmd_lock);
801 }
802
803 /* netif_tx_lock held, BHs disabled */
804 static void enic_tx_timeout(struct net_device *netdev)
805 {
806         struct enic *enic = netdev_priv(netdev);
807         schedule_work(&enic->reset);
808 }
809
810 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
811 {
812         struct enic *enic = vnic_dev_priv(rq->vdev);
813
814         if (!buf->os_buf)
815                 return;
816
817         pci_unmap_single(enic->pdev, buf->dma_addr,
818                 buf->len, PCI_DMA_FROMDEVICE);
819         dev_kfree_skb_any(buf->os_buf);
820 }
821
822 static inline struct sk_buff *enic_rq_alloc_skb(unsigned int size)
823 {
824         struct sk_buff *skb;
825
826         skb = dev_alloc_skb(size + NET_IP_ALIGN);
827
828         if (skb)
829                 skb_reserve(skb, NET_IP_ALIGN);
830
831         return skb;
832 }
833
834 static int enic_rq_alloc_buf(struct vnic_rq *rq)
835 {
836         struct enic *enic = vnic_dev_priv(rq->vdev);
837         struct sk_buff *skb;
838         unsigned int len = enic->netdev->mtu + ETH_HLEN;
839         unsigned int os_buf_index = 0;
840         dma_addr_t dma_addr;
841
842         skb = enic_rq_alloc_skb(len);
843         if (!skb)
844                 return -ENOMEM;
845
846         dma_addr = pci_map_single(enic->pdev, skb->data,
847                 len, PCI_DMA_FROMDEVICE);
848
849         enic_queue_rq_desc(rq, skb, os_buf_index,
850                 dma_addr, len);
851
852         return 0;
853 }
854
855 static int enic_get_skb_header(struct sk_buff *skb, void **iphdr,
856         void **tcph, u64 *hdr_flags, void *priv)
857 {
858         struct cq_enet_rq_desc *cq_desc = priv;
859         unsigned int ip_len;
860         struct iphdr *iph;
861
862         u8 type, color, eop, sop, ingress_port, vlan_stripped;
863         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
864         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
865         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
866         u8 packet_error;
867         u16 q_number, completed_index, bytes_written, vlan, checksum;
868         u32 rss_hash;
869
870         cq_enet_rq_desc_dec(cq_desc,
871                 &type, &color, &q_number, &completed_index,
872                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
873                 &csum_not_calc, &rss_hash, &bytes_written,
874                 &packet_error, &vlan_stripped, &vlan, &checksum,
875                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
876                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
877                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
878                 &fcs_ok);
879
880         if (!(ipv4 && tcp && !ipv4_fragment))
881                 return -1;
882
883         skb_reset_network_header(skb);
884         iph = ip_hdr(skb);
885
886         ip_len = ip_hdrlen(skb);
887         skb_set_transport_header(skb, ip_len);
888
889         /* check if ip header and tcp header are complete */
890         if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
891                 return -1;
892
893         *hdr_flags = LRO_IPV4 | LRO_TCP;
894         *tcph = tcp_hdr(skb);
895         *iphdr = iph;
896
897         return 0;
898 }
899
900 static void enic_rq_indicate_buf(struct vnic_rq *rq,
901         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
902         int skipped, void *opaque)
903 {
904         struct enic *enic = vnic_dev_priv(rq->vdev);
905         struct net_device *netdev = enic->netdev;
906         struct sk_buff *skb;
907
908         u8 type, color, eop, sop, ingress_port, vlan_stripped;
909         u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
910         u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
911         u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
912         u8 packet_error;
913         u16 q_number, completed_index, bytes_written, vlan, checksum;
914         u32 rss_hash;
915
916         if (skipped)
917                 return;
918
919         skb = buf->os_buf;
920         prefetch(skb->data - NET_IP_ALIGN);
921         pci_unmap_single(enic->pdev, buf->dma_addr,
922                 buf->len, PCI_DMA_FROMDEVICE);
923
924         cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
925                 &type, &color, &q_number, &completed_index,
926                 &ingress_port, &fcoe, &eop, &sop, &rss_type,
927                 &csum_not_calc, &rss_hash, &bytes_written,
928                 &packet_error, &vlan_stripped, &vlan, &checksum,
929                 &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
930                 &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
931                 &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
932                 &fcs_ok);
933
934         if (packet_error) {
935
936                 if (bytes_written > 0 && !fcs_ok)
937                         enic->rq_bad_fcs++;
938
939                 dev_kfree_skb_any(skb);
940
941                 return;
942         }
943
944         if (eop && bytes_written > 0) {
945
946                 /* Good receive
947                  */
948
949                 skb_put(skb, bytes_written);
950                 skb->protocol = eth_type_trans(skb, netdev);
951
952                 if (enic->csum_rx_enabled && !csum_not_calc) {
953                         skb->csum = htons(checksum);
954                         skb->ip_summed = CHECKSUM_COMPLETE;
955                 }
956
957                 skb->dev = netdev;
958
959                 if (enic->vlan_group && vlan_stripped) {
960
961                         if ((netdev->features & NETIF_F_LRO) && ipv4)
962                                 lro_vlan_hwaccel_receive_skb(&enic->lro_mgr,
963                                         skb, enic->vlan_group,
964                                         vlan, cq_desc);
965                         else
966                                 vlan_hwaccel_receive_skb(skb,
967                                         enic->vlan_group, vlan);
968
969                 } else {
970
971                         if ((netdev->features & NETIF_F_LRO) && ipv4)
972                                 lro_receive_skb(&enic->lro_mgr, skb, cq_desc);
973                         else
974                                 netif_receive_skb(skb);
975
976                 }
977
978         } else {
979
980                 /* Buffer overflow
981                  */
982
983                 dev_kfree_skb_any(skb);
984         }
985 }
986
987 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
988         u8 type, u16 q_number, u16 completed_index, void *opaque)
989 {
990         struct enic *enic = vnic_dev_priv(vdev);
991
992         vnic_rq_service(&enic->rq[q_number], cq_desc,
993                 completed_index, VNIC_RQ_RETURN_DESC,
994                 enic_rq_indicate_buf, opaque);
995
996         return 0;
997 }
998
999 static void enic_rq_drop_buf(struct vnic_rq *rq,
1000         struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1001         int skipped, void *opaque)
1002 {
1003         struct enic *enic = vnic_dev_priv(rq->vdev);
1004         struct sk_buff *skb = buf->os_buf;
1005
1006         if (skipped)
1007                 return;
1008
1009         pci_unmap_single(enic->pdev, buf->dma_addr,
1010                 buf->len, PCI_DMA_FROMDEVICE);
1011
1012         dev_kfree_skb_any(skb);
1013 }
1014
1015 static int enic_rq_service_drop(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1016         u8 type, u16 q_number, u16 completed_index, void *opaque)
1017 {
1018         struct enic *enic = vnic_dev_priv(vdev);
1019
1020         vnic_rq_service(&enic->rq[q_number], cq_desc,
1021                 completed_index, VNIC_RQ_RETURN_DESC,
1022                 enic_rq_drop_buf, opaque);
1023
1024         return 0;
1025 }
1026
1027 static int enic_poll(struct napi_struct *napi, int budget)
1028 {
1029         struct enic *enic = container_of(napi, struct enic, napi);
1030         struct net_device *netdev = enic->netdev;
1031         unsigned int rq_work_to_do = budget;
1032         unsigned int wq_work_to_do = -1; /* no limit */
1033         unsigned int  work_done, rq_work_done, wq_work_done;
1034
1035         /* Service RQ (first) and WQ
1036          */
1037
1038         rq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1039                 rq_work_to_do, enic_rq_service, NULL);
1040
1041         wq_work_done = vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
1042                 wq_work_to_do, enic_wq_service, NULL);
1043
1044         /* Accumulate intr event credits for this polling
1045          * cycle.  An intr event is the completion of a
1046          * a WQ or RQ packet.
1047          */
1048
1049         work_done = rq_work_done + wq_work_done;
1050
1051         if (work_done > 0)
1052                 vnic_intr_return_credits(&enic->intr[ENIC_INTX_WQ_RQ],
1053                         work_done,
1054                         0 /* don't unmask intr */,
1055                         0 /* don't reset intr timer */);
1056
1057         if (rq_work_done > 0) {
1058
1059                 /* Replenish RQ
1060                  */
1061
1062                 vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1063
1064         } else {
1065
1066                 /* If no work done, flush all LROs and exit polling
1067                  */
1068
1069                 if (netdev->features & NETIF_F_LRO)
1070                         lro_flush_all(&enic->lro_mgr);
1071
1072                 napi_complete(napi);
1073                 vnic_intr_unmask(&enic->intr[ENIC_INTX_WQ_RQ]);
1074         }
1075
1076         return rq_work_done;
1077 }
1078
1079 static int enic_poll_msix(struct napi_struct *napi, int budget)
1080 {
1081         struct enic *enic = container_of(napi, struct enic, napi);
1082         struct net_device *netdev = enic->netdev;
1083         unsigned int work_to_do = budget;
1084         unsigned int work_done;
1085
1086         /* Service RQ
1087          */
1088
1089         work_done = vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1090                 work_to_do, enic_rq_service, NULL);
1091
1092         if (work_done > 0) {
1093
1094                 /* Replenish RQ
1095                  */
1096
1097                 vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1098
1099                 /* Return intr event credits for this polling
1100                  * cycle.  An intr event is the completion of a
1101                  * RQ packet.
1102                  */
1103
1104                 vnic_intr_return_credits(&enic->intr[ENIC_MSIX_RQ],
1105                         work_done,
1106                         0 /* don't unmask intr */,
1107                         0 /* don't reset intr timer */);
1108         } else {
1109
1110                 /* If no work done, flush all LROs and exit polling
1111                  */
1112
1113                 if (netdev->features & NETIF_F_LRO)
1114                         lro_flush_all(&enic->lro_mgr);
1115
1116                 napi_complete(napi);
1117                 vnic_intr_unmask(&enic->intr[ENIC_MSIX_RQ]);
1118         }
1119
1120         return work_done;
1121 }
1122
1123 static void enic_notify_timer(unsigned long data)
1124 {
1125         struct enic *enic = (struct enic *)data;
1126
1127         enic_notify_check(enic);
1128
1129         mod_timer(&enic->notify_timer,
1130                 round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1131 }
1132
1133 static void enic_free_intr(struct enic *enic)
1134 {
1135         struct net_device *netdev = enic->netdev;
1136         unsigned int i;
1137
1138         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1139         case VNIC_DEV_INTR_MODE_INTX:
1140                 free_irq(enic->pdev->irq, netdev);
1141                 break;
1142         case VNIC_DEV_INTR_MODE_MSI:
1143                 free_irq(enic->pdev->irq, enic);
1144                 break;
1145         case VNIC_DEV_INTR_MODE_MSIX:
1146                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1147                         if (enic->msix[i].requested)
1148                                 free_irq(enic->msix_entry[i].vector,
1149                                         enic->msix[i].devid);
1150                 break;
1151         default:
1152                 break;
1153         }
1154 }
1155
1156 static int enic_request_intr(struct enic *enic)
1157 {
1158         struct net_device *netdev = enic->netdev;
1159         unsigned int i;
1160         int err = 0;
1161
1162         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1163
1164         case VNIC_DEV_INTR_MODE_INTX:
1165
1166                 err = request_irq(enic->pdev->irq, enic_isr_legacy,
1167                         IRQF_SHARED, netdev->name, netdev);
1168                 break;
1169
1170         case VNIC_DEV_INTR_MODE_MSI:
1171
1172                 err = request_irq(enic->pdev->irq, enic_isr_msi,
1173                         0, netdev->name, enic);
1174                 break;
1175
1176         case VNIC_DEV_INTR_MODE_MSIX:
1177
1178                 sprintf(enic->msix[ENIC_MSIX_RQ].devname,
1179                         "%.11s-rx-0", netdev->name);
1180                 enic->msix[ENIC_MSIX_RQ].isr = enic_isr_msix_rq;
1181                 enic->msix[ENIC_MSIX_RQ].devid = enic;
1182
1183                 sprintf(enic->msix[ENIC_MSIX_WQ].devname,
1184                         "%.11s-tx-0", netdev->name);
1185                 enic->msix[ENIC_MSIX_WQ].isr = enic_isr_msix_wq;
1186                 enic->msix[ENIC_MSIX_WQ].devid = enic;
1187
1188                 sprintf(enic->msix[ENIC_MSIX_ERR].devname,
1189                         "%.11s-err", netdev->name);
1190                 enic->msix[ENIC_MSIX_ERR].isr = enic_isr_msix_err;
1191                 enic->msix[ENIC_MSIX_ERR].devid = enic;
1192
1193                 sprintf(enic->msix[ENIC_MSIX_NOTIFY].devname,
1194                         "%.11s-notify", netdev->name);
1195                 enic->msix[ENIC_MSIX_NOTIFY].isr = enic_isr_msix_notify;
1196                 enic->msix[ENIC_MSIX_NOTIFY].devid = enic;
1197
1198                 for (i = 0; i < ARRAY_SIZE(enic->msix); i++) {
1199                         err = request_irq(enic->msix_entry[i].vector,
1200                                 enic->msix[i].isr, 0,
1201                                 enic->msix[i].devname,
1202                                 enic->msix[i].devid);
1203                         if (err) {
1204                                 enic_free_intr(enic);
1205                                 break;
1206                         }
1207                         enic->msix[i].requested = 1;
1208                 }
1209
1210                 break;
1211
1212         default:
1213                 break;
1214         }
1215
1216         return err;
1217 }
1218
1219 static int enic_notify_set(struct enic *enic)
1220 {
1221         int err;
1222
1223         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1224         case VNIC_DEV_INTR_MODE_INTX:
1225                 err = vnic_dev_notify_set(enic->vdev, ENIC_INTX_NOTIFY);
1226                 break;
1227         case VNIC_DEV_INTR_MODE_MSIX:
1228                 err = vnic_dev_notify_set(enic->vdev, ENIC_MSIX_NOTIFY);
1229                 break;
1230         default:
1231                 err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1232                 break;
1233         }
1234
1235         return err;
1236 }
1237
1238 static void enic_notify_timer_start(struct enic *enic)
1239 {
1240         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1241         case VNIC_DEV_INTR_MODE_MSI:
1242                 mod_timer(&enic->notify_timer, jiffies);
1243                 break;
1244         default:
1245                 /* Using intr for notification for INTx/MSI-X */
1246                 break;
1247         };
1248 }
1249
1250 /* rtnl lock is held, process context */
1251 static int enic_open(struct net_device *netdev)
1252 {
1253         struct enic *enic = netdev_priv(netdev);
1254         unsigned int i;
1255         int err;
1256
1257         err = enic_request_intr(enic);
1258         if (err) {
1259                 printk(KERN_ERR PFX "%s: Unable to request irq.\n",
1260                         netdev->name);
1261                 return err;
1262         }
1263
1264         err = enic_notify_set(enic);
1265         if (err) {
1266                 printk(KERN_ERR PFX
1267                         "%s: Failed to alloc notify buffer, aborting.\n",
1268                         netdev->name);
1269                 goto err_out_free_intr;
1270         }
1271
1272         for (i = 0; i < enic->rq_count; i++) {
1273                 err = vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1274                 if (err) {
1275                         printk(KERN_ERR PFX
1276                                 "%s: Unable to alloc receive buffers.\n",
1277                                 netdev->name);
1278                         goto err_out_notify_unset;
1279                 }
1280         }
1281
1282         for (i = 0; i < enic->wq_count; i++)
1283                 vnic_wq_enable(&enic->wq[i]);
1284         for (i = 0; i < enic->rq_count; i++)
1285                 vnic_rq_enable(&enic->rq[i]);
1286
1287         enic_add_station_addr(enic);
1288         enic_set_multicast_list(netdev);
1289
1290         netif_wake_queue(netdev);
1291         napi_enable(&enic->napi);
1292         vnic_dev_enable(enic->vdev);
1293
1294         for (i = 0; i < enic->intr_count; i++)
1295                 vnic_intr_unmask(&enic->intr[i]);
1296
1297         enic_notify_timer_start(enic);
1298
1299         return 0;
1300
1301 err_out_notify_unset:
1302         vnic_dev_notify_unset(enic->vdev);
1303 err_out_free_intr:
1304         enic_free_intr(enic);
1305
1306         return err;
1307 }
1308
1309 /* rtnl lock is held, process context */
1310 static int enic_stop(struct net_device *netdev)
1311 {
1312         struct enic *enic = netdev_priv(netdev);
1313         unsigned int i;
1314         int err;
1315
1316         del_timer_sync(&enic->notify_timer);
1317
1318         vnic_dev_disable(enic->vdev);
1319         napi_disable(&enic->napi);
1320         netif_stop_queue(netdev);
1321
1322         for (i = 0; i < enic->intr_count; i++)
1323                 vnic_intr_mask(&enic->intr[i]);
1324
1325         for (i = 0; i < enic->wq_count; i++) {
1326                 err = vnic_wq_disable(&enic->wq[i]);
1327                 if (err)
1328                         return err;
1329         }
1330         for (i = 0; i < enic->rq_count; i++) {
1331                 err = vnic_rq_disable(&enic->rq[i]);
1332                 if (err)
1333                         return err;
1334         }
1335
1336         vnic_dev_notify_unset(enic->vdev);
1337         enic_free_intr(enic);
1338
1339         (void)vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
1340                 -1, enic_rq_service_drop, NULL);
1341         (void)vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
1342                 -1, enic_wq_service, NULL);
1343
1344         for (i = 0; i < enic->wq_count; i++)
1345                 vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
1346         for (i = 0; i < enic->rq_count; i++)
1347                 vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1348         for (i = 0; i < enic->cq_count; i++)
1349                 vnic_cq_clean(&enic->cq[i]);
1350         for (i = 0; i < enic->intr_count; i++)
1351                 vnic_intr_clean(&enic->intr[i]);
1352
1353         return 0;
1354 }
1355
1356 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
1357 {
1358         struct enic *enic = netdev_priv(netdev);
1359         int running = netif_running(netdev);
1360
1361         if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
1362                 return -EINVAL;
1363
1364         if (running)
1365                 enic_stop(netdev);
1366
1367         netdev->mtu = new_mtu;
1368
1369         if (netdev->mtu > enic->port_mtu)
1370                 printk(KERN_WARNING PFX
1371                         "%s: interface MTU (%d) set higher "
1372                         "than port MTU (%d)\n",
1373                         netdev->name, netdev->mtu, enic->port_mtu);
1374
1375         if (running)
1376                 enic_open(netdev);
1377
1378         return 0;
1379 }
1380
1381 #ifdef CONFIG_NET_POLL_CONTROLLER
1382 static void enic_poll_controller(struct net_device *netdev)
1383 {
1384         struct enic *enic = netdev_priv(netdev);
1385         struct vnic_dev *vdev = enic->vdev;
1386
1387         switch (vnic_dev_get_intr_mode(vdev)) {
1388         case VNIC_DEV_INTR_MODE_MSIX:
1389                 enic_isr_msix_rq(enic->pdev->irq, enic);
1390                 enic_isr_msix_wq(enic->pdev->irq, enic);
1391                 break;
1392         case VNIC_DEV_INTR_MODE_MSI:
1393                 enic_isr_msi(enic->pdev->irq, enic);
1394                 break;
1395         case VNIC_DEV_INTR_MODE_INTX:
1396                 enic_isr_legacy(enic->pdev->irq, netdev);
1397                 break;
1398         default:
1399                 break;
1400         }
1401 }
1402 #endif
1403
1404 static int enic_dev_wait(struct vnic_dev *vdev,
1405         int (*start)(struct vnic_dev *, int),
1406         int (*finished)(struct vnic_dev *, int *),
1407         int arg)
1408 {
1409         unsigned long time;
1410         int done;
1411         int err;
1412
1413         BUG_ON(in_interrupt());
1414
1415         err = start(vdev, arg);
1416         if (err)
1417                 return err;
1418
1419         /* Wait for func to complete...2 seconds max
1420          */
1421
1422         time = jiffies + (HZ * 2);
1423         do {
1424
1425                 err = finished(vdev, &done);
1426                 if (err)
1427                         return err;
1428
1429                 if (done)
1430                         return 0;
1431
1432                 schedule_timeout_uninterruptible(HZ / 10);
1433
1434         } while (time_after(time, jiffies));
1435
1436         return -ETIMEDOUT;
1437 }
1438
1439 static int enic_dev_open(struct enic *enic)
1440 {
1441         int err;
1442
1443         err = enic_dev_wait(enic->vdev, vnic_dev_open,
1444                 vnic_dev_open_done, 0);
1445         if (err)
1446                 printk(KERN_ERR PFX
1447                         "vNIC device open failed, err %d.\n", err);
1448
1449         return err;
1450 }
1451
1452 static int enic_dev_soft_reset(struct enic *enic)
1453 {
1454         int err;
1455
1456         err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
1457                 vnic_dev_soft_reset_done, 0);
1458         if (err)
1459                 printk(KERN_ERR PFX
1460                         "vNIC soft reset failed, err %d.\n", err);
1461
1462         return err;
1463 }
1464
1465 static int enic_set_niccfg(struct enic *enic)
1466 {
1467         const u8 rss_default_cpu = 0;
1468         const u8 rss_hash_type = 0;
1469         const u8 rss_hash_bits = 0;
1470         const u8 rss_base_cpu = 0;
1471         const u8 rss_enable = 0;
1472         const u8 tso_ipid_split_en = 0;
1473         const u8 ig_vlan_strip_en = 1;
1474
1475         /* Enable VLAN tag stripping.  RSS not enabled (yet).
1476         */
1477
1478         return enic_set_nic_cfg(enic,
1479                 rss_default_cpu, rss_hash_type,
1480                 rss_hash_bits, rss_base_cpu,
1481                 rss_enable, tso_ipid_split_en,
1482                 ig_vlan_strip_en);
1483 }
1484
1485 static void enic_reset(struct work_struct *work)
1486 {
1487         struct enic *enic = container_of(work, struct enic, reset);
1488
1489         if (!netif_running(enic->netdev))
1490                 return;
1491
1492         rtnl_lock();
1493
1494         spin_lock(&enic->devcmd_lock);
1495         vnic_dev_hang_notify(enic->vdev);
1496         spin_unlock(&enic->devcmd_lock);
1497
1498         enic_stop(enic->netdev);
1499         enic_dev_soft_reset(enic);
1500         vnic_dev_init(enic->vdev, 0);
1501         enic_reset_mcaddrs(enic);
1502         enic_init_vnic_resources(enic);
1503         enic_set_niccfg(enic);
1504         enic_open(enic->netdev);
1505
1506         rtnl_unlock();
1507 }
1508
1509 static int enic_set_intr_mode(struct enic *enic)
1510 {
1511         unsigned int n = ARRAY_SIZE(enic->rq);
1512         unsigned int m = ARRAY_SIZE(enic->wq);
1513         unsigned int i;
1514
1515         /* Set interrupt mode (INTx, MSI, MSI-X) depending
1516          * system capabilities.
1517          *
1518          * Try MSI-X first
1519          *
1520          * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
1521          * (the second to last INTR is used for WQ/RQ errors)
1522          * (the last INTR is used for notifications)
1523          */
1524
1525         BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
1526         for (i = 0; i < n + m + 2; i++)
1527                 enic->msix_entry[i].entry = i;
1528
1529         if (enic->config.intr_mode < 1 &&
1530             enic->rq_count >= n &&
1531             enic->wq_count >= m &&
1532             enic->cq_count >= n + m &&
1533             enic->intr_count >= n + m + 2 &&
1534             !pci_enable_msix(enic->pdev, enic->msix_entry, n + m + 2)) {
1535
1536                 enic->rq_count = n;
1537                 enic->wq_count = m;
1538                 enic->cq_count = n + m;
1539                 enic->intr_count = n + m + 2;
1540
1541                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSIX);
1542
1543                 return 0;
1544         }
1545
1546         /* Next try MSI
1547          *
1548          * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
1549          */
1550
1551         if (enic->config.intr_mode < 2 &&
1552             enic->rq_count >= 1 &&
1553             enic->wq_count >= 1 &&
1554             enic->cq_count >= 2 &&
1555             enic->intr_count >= 1 &&
1556             !pci_enable_msi(enic->pdev)) {
1557
1558                 enic->rq_count = 1;
1559                 enic->wq_count = 1;
1560                 enic->cq_count = 2;
1561                 enic->intr_count = 1;
1562
1563                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
1564
1565                 return 0;
1566         }
1567
1568         /* Next try INTx
1569          *
1570          * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
1571          * (the first INTR is used for WQ/RQ)
1572          * (the second INTR is used for WQ/RQ errors)
1573          * (the last INTR is used for notifications)
1574          */
1575
1576         if (enic->config.intr_mode < 3 &&
1577             enic->rq_count >= 1 &&
1578             enic->wq_count >= 1 &&
1579             enic->cq_count >= 2 &&
1580             enic->intr_count >= 3) {
1581
1582                 enic->rq_count = 1;
1583                 enic->wq_count = 1;
1584                 enic->cq_count = 2;
1585                 enic->intr_count = 3;
1586
1587                 vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
1588
1589                 return 0;
1590         }
1591
1592         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1593
1594         return -EINVAL;
1595 }
1596
1597 static void enic_clear_intr_mode(struct enic *enic)
1598 {
1599         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1600         case VNIC_DEV_INTR_MODE_MSIX:
1601                 pci_disable_msix(enic->pdev);
1602                 break;
1603         case VNIC_DEV_INTR_MODE_MSI:
1604                 pci_disable_msi(enic->pdev);
1605                 break;
1606         default:
1607                 break;
1608         }
1609
1610         vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
1611 }
1612
1613 static void enic_iounmap(struct enic *enic)
1614 {
1615         if (enic->bar0.vaddr)
1616                 iounmap(enic->bar0.vaddr);
1617 }
1618
1619 static const struct net_device_ops enic_netdev_ops = {
1620         .ndo_open               = enic_open,
1621         .ndo_stop               = enic_stop,
1622         .ndo_start_xmit         = enic_hard_start_xmit,
1623         .ndo_get_stats          = enic_get_stats,
1624         .ndo_validate_addr      = eth_validate_addr,
1625         .ndo_set_mac_address    = eth_mac_addr,
1626         .ndo_set_multicast_list = enic_set_multicast_list,
1627         .ndo_change_mtu         = enic_change_mtu,
1628         .ndo_vlan_rx_register   = enic_vlan_rx_register,
1629         .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
1630         .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
1631         .ndo_tx_timeout         = enic_tx_timeout,
1632 #ifdef CONFIG_NET_POLL_CONTROLLER
1633         .ndo_poll_controller    = enic_poll_controller,
1634 #endif
1635 };
1636
1637 static int __devinit enic_probe(struct pci_dev *pdev,
1638         const struct pci_device_id *ent)
1639 {
1640         struct net_device *netdev;
1641         struct enic *enic;
1642         int using_dac = 0;
1643         unsigned int i;
1644         int err;
1645
1646         /* Allocate net device structure and initialize.  Private
1647          * instance data is initialized to zero.
1648          */
1649
1650         netdev = alloc_etherdev(sizeof(struct enic));
1651         if (!netdev) {
1652                 printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
1653                 return -ENOMEM;
1654         }
1655
1656         pci_set_drvdata(pdev, netdev);
1657
1658         SET_NETDEV_DEV(netdev, &pdev->dev);
1659
1660         enic = netdev_priv(netdev);
1661         enic->netdev = netdev;
1662         enic->pdev = pdev;
1663
1664         /* Setup PCI resources
1665          */
1666
1667         err = pci_enable_device(pdev);
1668         if (err) {
1669                 printk(KERN_ERR PFX
1670                         "Cannot enable PCI device, aborting.\n");
1671                 goto err_out_free_netdev;
1672         }
1673
1674         err = pci_request_regions(pdev, DRV_NAME);
1675         if (err) {
1676                 printk(KERN_ERR PFX
1677                         "Cannot request PCI regions, aborting.\n");
1678                 goto err_out_disable_device;
1679         }
1680
1681         pci_set_master(pdev);
1682
1683         /* Query PCI controller on system for DMA addressing
1684          * limitation for the device.  Try 40-bit first, and
1685          * fail to 32-bit.
1686          */
1687
1688         err = pci_set_dma_mask(pdev, DMA_40BIT_MASK);
1689         if (err) {
1690                 err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
1691                 if (err) {
1692                         printk(KERN_ERR PFX
1693                                 "No usable DMA configuration, aborting.\n");
1694                         goto err_out_release_regions;
1695                 }
1696                 err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
1697                 if (err) {
1698                         printk(KERN_ERR PFX
1699                                 "Unable to obtain 32-bit DMA "
1700                                 "for consistent allocations, aborting.\n");
1701                         goto err_out_release_regions;
1702                 }
1703         } else {
1704                 err = pci_set_consistent_dma_mask(pdev, DMA_40BIT_MASK);
1705                 if (err) {
1706                         printk(KERN_ERR PFX
1707                                 "Unable to obtain 40-bit DMA "
1708                                 "for consistent allocations, aborting.\n");
1709                         goto err_out_release_regions;
1710                 }
1711                 using_dac = 1;
1712         }
1713
1714         /* Map vNIC resources from BAR0
1715          */
1716
1717         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
1718                 printk(KERN_ERR PFX
1719                         "BAR0 not memory-map'able, aborting.\n");
1720                 err = -ENODEV;
1721                 goto err_out_release_regions;
1722         }
1723
1724         enic->bar0.vaddr = pci_iomap(pdev, 0, enic->bar0.len);
1725         enic->bar0.bus_addr = pci_resource_start(pdev, 0);
1726         enic->bar0.len = pci_resource_len(pdev, 0);
1727
1728         if (!enic->bar0.vaddr) {
1729                 printk(KERN_ERR PFX
1730                         "Cannot memory-map BAR0 res hdr, aborting.\n");
1731                 err = -ENODEV;
1732                 goto err_out_release_regions;
1733         }
1734
1735         /* Register vNIC device
1736          */
1737
1738         enic->vdev = vnic_dev_register(NULL, enic, pdev, &enic->bar0);
1739         if (!enic->vdev) {
1740                 printk(KERN_ERR PFX
1741                         "vNIC registration failed, aborting.\n");
1742                 err = -ENODEV;
1743                 goto err_out_iounmap;
1744         }
1745
1746         /* Issue device open to get device in known state
1747          */
1748
1749         err = enic_dev_open(enic);
1750         if (err) {
1751                 printk(KERN_ERR PFX
1752                         "vNIC dev open failed, aborting.\n");
1753                 goto err_out_vnic_unregister;
1754         }
1755
1756         /* Issue device init to initialize the vnic-to-switch link.
1757          * We'll start with carrier off and wait for link UP
1758          * notification later to turn on carrier.  We don't need
1759          * to wait here for the vnic-to-switch link initialization
1760          * to complete; link UP notification is the indication that
1761          * the process is complete.
1762          */
1763
1764         netif_carrier_off(netdev);
1765
1766         err = vnic_dev_init(enic->vdev, 0);
1767         if (err) {
1768                 printk(KERN_ERR PFX
1769                         "vNIC dev init failed, aborting.\n");
1770                 goto err_out_dev_close;
1771         }
1772
1773         /* Get vNIC configuration
1774          */
1775
1776         err = enic_get_vnic_config(enic);
1777         if (err) {
1778                 printk(KERN_ERR PFX
1779                         "Get vNIC configuration failed, aborting.\n");
1780                 goto err_out_dev_close;
1781         }
1782
1783         /* Get available resource counts
1784          */
1785
1786         enic_get_res_counts(enic);
1787
1788         /* Set interrupt mode based on resource counts and system
1789          * capabilities
1790          */
1791
1792         err = enic_set_intr_mode(enic);
1793         if (err) {
1794                 printk(KERN_ERR PFX
1795                         "Failed to set intr mode, aborting.\n");
1796                 goto err_out_dev_close;
1797         }
1798
1799         /* Allocate and configure vNIC resources
1800          */
1801
1802         err = enic_alloc_vnic_resources(enic);
1803         if (err) {
1804                 printk(KERN_ERR PFX
1805                         "Failed to alloc vNIC resources, aborting.\n");
1806                 goto err_out_free_vnic_resources;
1807         }
1808
1809         enic_init_vnic_resources(enic);
1810
1811         err = enic_set_niccfg(enic);
1812         if (err) {
1813                 printk(KERN_ERR PFX
1814                         "Failed to config nic, aborting.\n");
1815                 goto err_out_free_vnic_resources;
1816         }
1817
1818         /* Setup notification timer, HW reset task, and locks
1819          */
1820
1821         init_timer(&enic->notify_timer);
1822         enic->notify_timer.function = enic_notify_timer;
1823         enic->notify_timer.data = (unsigned long)enic;
1824
1825         INIT_WORK(&enic->reset, enic_reset);
1826
1827         for (i = 0; i < enic->wq_count; i++)
1828                 spin_lock_init(&enic->wq_lock[i]);
1829
1830         spin_lock_init(&enic->devcmd_lock);
1831
1832         /* Register net device
1833          */
1834
1835         enic->port_mtu = enic->config.mtu;
1836         (void)enic_change_mtu(netdev, enic->port_mtu);
1837
1838         err = enic_set_mac_addr(netdev, enic->mac_addr);
1839         if (err) {
1840                 printk(KERN_ERR PFX
1841                         "Invalid MAC address, aborting.\n");
1842                 goto err_out_free_vnic_resources;
1843         }
1844
1845         netdev->netdev_ops = &enic_netdev_ops;
1846         netdev->watchdog_timeo = 2 * HZ;
1847         netdev->ethtool_ops = &enic_ethtool_ops;
1848
1849         switch (vnic_dev_get_intr_mode(enic->vdev)) {
1850         default:
1851                 netif_napi_add(netdev, &enic->napi, enic_poll, 64);
1852                 break;
1853         case VNIC_DEV_INTR_MODE_MSIX:
1854                 netif_napi_add(netdev, &enic->napi, enic_poll_msix, 64);
1855                 break;
1856         }
1857
1858         netdev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
1859         if (ENIC_SETTING(enic, TXCSUM))
1860                 netdev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
1861         if (ENIC_SETTING(enic, TSO))
1862                 netdev->features |= NETIF_F_TSO |
1863                         NETIF_F_TSO6 | NETIF_F_TSO_ECN;
1864         if (ENIC_SETTING(enic, LRO))
1865                 netdev->features |= NETIF_F_LRO;
1866         if (using_dac)
1867                 netdev->features |= NETIF_F_HIGHDMA;
1868
1869         enic->csum_rx_enabled = ENIC_SETTING(enic, RXCSUM);
1870
1871         enic->lro_mgr.max_aggr = ENIC_LRO_MAX_AGGR;
1872         enic->lro_mgr.max_desc = ENIC_LRO_MAX_DESC;
1873         enic->lro_mgr.lro_arr = enic->lro_desc;
1874         enic->lro_mgr.get_skb_header = enic_get_skb_header;
1875         enic->lro_mgr.features  = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
1876         enic->lro_mgr.dev = netdev;
1877         enic->lro_mgr.ip_summed = CHECKSUM_COMPLETE;
1878         enic->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1879
1880         err = register_netdev(netdev);
1881         if (err) {
1882                 printk(KERN_ERR PFX
1883                         "Cannot register net device, aborting.\n");
1884                 goto err_out_free_vnic_resources;
1885         }
1886
1887         return 0;
1888
1889 err_out_free_vnic_resources:
1890         enic_free_vnic_resources(enic);
1891 err_out_dev_close:
1892         vnic_dev_close(enic->vdev);
1893 err_out_vnic_unregister:
1894         enic_clear_intr_mode(enic);
1895         vnic_dev_unregister(enic->vdev);
1896 err_out_iounmap:
1897         enic_iounmap(enic);
1898 err_out_release_regions:
1899         pci_release_regions(pdev);
1900 err_out_disable_device:
1901         pci_disable_device(pdev);
1902 err_out_free_netdev:
1903         pci_set_drvdata(pdev, NULL);
1904         free_netdev(netdev);
1905
1906         return err;
1907 }
1908
1909 static void __devexit enic_remove(struct pci_dev *pdev)
1910 {
1911         struct net_device *netdev = pci_get_drvdata(pdev);
1912
1913         if (netdev) {
1914                 struct enic *enic = netdev_priv(netdev);
1915
1916                 flush_scheduled_work();
1917                 unregister_netdev(netdev);
1918                 enic_free_vnic_resources(enic);
1919                 vnic_dev_close(enic->vdev);
1920                 enic_clear_intr_mode(enic);
1921                 vnic_dev_unregister(enic->vdev);
1922                 enic_iounmap(enic);
1923                 pci_release_regions(pdev);
1924                 pci_disable_device(pdev);
1925                 pci_set_drvdata(pdev, NULL);
1926                 free_netdev(netdev);
1927         }
1928 }
1929
1930 static struct pci_driver enic_driver = {
1931         .name = DRV_NAME,
1932         .id_table = enic_id_table,
1933         .probe = enic_probe,
1934         .remove = __devexit_p(enic_remove),
1935 };
1936
1937 static int __init enic_init_module(void)
1938 {
1939         printk(KERN_INFO PFX "%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
1940
1941         return pci_register_driver(&enic_driver);
1942 }
1943
1944 static void __exit enic_cleanup_module(void)
1945 {
1946         pci_unregister_driver(&enic_driver);
1947 }
1948
1949 module_init(enic_init_module);
1950 module_exit(enic_cleanup_module);