1 /*
2  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
4  *
5  * This program is free software; you may redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; version 2 of the License.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16  * SOFTWARE.
17  *
18  */
19 
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/workqueue.h>
28 #include <linux/pci.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/if.h>
32 #include <linux/if_ether.h>
33 #include <linux/if_vlan.h>
34 #include <linux/in.h>
35 #include <linux/ip.h>
36 #include <linux/ipv6.h>
37 #include <linux/tcp.h>
38 #include <linux/rtnetlink.h>
39 #include <linux/prefetch.h>
40 #include <net/ip6_checksum.h>
41 #include <linux/ktime.h>
42 #include <linux/numa.h>
43 #ifdef CONFIG_RFS_ACCEL
44 #include <linux/cpu_rmap.h>
45 #endif
46 #include <linux/crash_dump.h>
47 #include <net/busy_poll.h>
48 #include <net/vxlan.h>
49 
50 #include "cq_enet_desc.h"
51 #include "vnic_dev.h"
52 #include "vnic_intr.h"
53 #include "vnic_stats.h"
54 #include "vnic_vic.h"
55 #include "enic_res.h"
56 #include "enic.h"
57 #include "enic_dev.h"
58 #include "enic_pp.h"
59 #include "enic_clsf.h"
60 
61 #define ENIC_NOTIFY_TIMER_PERIOD	(2 * HZ)
62 #define WQ_ENET_MAX_DESC_LEN		(1 << WQ_ENET_LEN_BITS)
63 #define MAX_TSO				(1 << 16)
64 #define ENIC_DESC_MAX_SPLITS		(MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
65 
66 #define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
67 #define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
68 #define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
69 
70 #define RX_COPYBREAK_DEFAULT		256
71 
72 /* Supported devices */
73 static const struct pci_device_id enic_id_table[] = {
74 	{ PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
75 	{ PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
76 	{ PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
77 	{ 0, }	/* end of table */
78 };
79 
80 MODULE_DESCRIPTION(DRV_DESCRIPTION);
81 MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
82 MODULE_LICENSE("GPL");
83 MODULE_DEVICE_TABLE(pci, enic_id_table);
84 
85 #define ENIC_LARGE_PKT_THRESHOLD		1000
86 #define ENIC_MAX_COALESCE_TIMERS		10
87 /*  Interrupt moderation table, which will be used to decide the
88  *  coalescing timer values
89  *  {rx_rate in Mbps, mapping percentage of the range}
90  */
91 static struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
92 	{4000,  0},
93 	{4400, 10},
94 	{5060, 20},
95 	{5230, 30},
96 	{5540, 40},
97 	{5820, 50},
98 	{6120, 60},
99 	{6435, 70},
100 	{6745, 80},
101 	{7000, 90},
102 	{0xFFFFFFFF, 100}
103 };
104 
105 /* This table helps the driver to pick different ranges for rx coalescing
106  * timer depending on the link speed.
107  */
108 static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
109 	{0,  0}, /* 0  - 4  Gbps */
110 	{0,  3}, /* 4  - 10 Gbps */
111 	{3,  6}, /* 10 - 40 Gbps */
112 };
113 
114 static void enic_init_affinity_hint(struct enic *enic)
115 {
116 	int numa_node = dev_to_node(&enic->pdev->dev);
117 	int i;
118 
119 	for (i = 0; i < enic->intr_count; i++) {
120 		if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) ||
121 		    (cpumask_available(enic->msix[i].affinity_mask) &&
122 		     !cpumask_empty(enic->msix[i].affinity_mask)))
123 			continue;
124 		if (zalloc_cpumask_var(&enic->msix[i].affinity_mask,
125 				       GFP_KERNEL))
126 			cpumask_set_cpu(cpumask_local_spread(i, numa_node),
127 					enic->msix[i].affinity_mask);
128 	}
129 }
130 
131 static void enic_free_affinity_hint(struct enic *enic)
132 {
133 	int i;
134 
135 	for (i = 0; i < enic->intr_count; i++) {
136 		if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i))
137 			continue;
138 		free_cpumask_var(enic->msix[i].affinity_mask);
139 	}
140 }
141 
142 static void enic_set_affinity_hint(struct enic *enic)
143 {
144 	int i;
145 	int err;
146 
147 	for (i = 0; i < enic->intr_count; i++) {
148 		if (enic_is_err_intr(enic, i)		||
149 		    enic_is_notify_intr(enic, i)	||
150 		    !cpumask_available(enic->msix[i].affinity_mask) ||
151 		    cpumask_empty(enic->msix[i].affinity_mask))
152 			continue;
153 		err = irq_update_affinity_hint(enic->msix_entry[i].vector,
154 					       enic->msix[i].affinity_mask);
155 		if (err)
156 			netdev_warn(enic->netdev, "irq_update_affinity_hint failed, err %d\n",
157 				    err);
158 	}
159 
160 	for (i = 0; i < enic->wq_count; i++) {
161 		int wq_intr = enic_msix_wq_intr(enic, i);
162 
163 		if (cpumask_available(enic->msix[wq_intr].affinity_mask) &&
164 		    !cpumask_empty(enic->msix[wq_intr].affinity_mask))
165 			netif_set_xps_queue(enic->netdev,
166 					    enic->msix[wq_intr].affinity_mask,
167 					    i);
168 	}
169 }
170 
171 static void enic_unset_affinity_hint(struct enic *enic)
172 {
173 	int i;
174 
175 	for (i = 0; i < enic->intr_count; i++)
176 		irq_update_affinity_hint(enic->msix_entry[i].vector, NULL);
177 }
178 
179 static int enic_udp_tunnel_set_port(struct net_device *netdev,
180 				    unsigned int table, unsigned int entry,
181 				    struct udp_tunnel_info *ti)
182 {
183 	struct enic *enic = netdev_priv(netdev);
184 	int err;
185 
186 	spin_lock_bh(&enic->devcmd_lock);
187 
188 	err = vnic_dev_overlay_offload_cfg(enic->vdev,
189 					   OVERLAY_CFG_VXLAN_PORT_UPDATE,
190 					   ntohs(ti->port));
191 	if (err)
192 		goto error;
193 
194 	err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
195 					    enic->vxlan.patch_level);
196 	if (err)
197 		goto error;
198 
199 	enic->vxlan.vxlan_udp_port_number = ntohs(ti->port);
200 error:
201 	spin_unlock_bh(&enic->devcmd_lock);
202 
203 	return err;
204 }
205 
206 static int enic_udp_tunnel_unset_port(struct net_device *netdev,
207 				      unsigned int table, unsigned int entry,
208 				      struct udp_tunnel_info *ti)
209 {
210 	struct enic *enic = netdev_priv(netdev);
211 	int err;
212 
213 	spin_lock_bh(&enic->devcmd_lock);
214 
215 	err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
216 					    OVERLAY_OFFLOAD_DISABLE);
217 	if (err)
218 		goto unlock;
219 
220 	enic->vxlan.vxlan_udp_port_number = 0;
221 
222 unlock:
223 	spin_unlock_bh(&enic->devcmd_lock);
224 
225 	return err;
226 }
227 
228 static const struct udp_tunnel_nic_info enic_udp_tunnels = {
229 	.set_port	= enic_udp_tunnel_set_port,
230 	.unset_port	= enic_udp_tunnel_unset_port,
231 	.tables		= {
232 		{ .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, },
233 	},
234 }, enic_udp_tunnels_v4 = {
235 	.set_port	= enic_udp_tunnel_set_port,
236 	.unset_port	= enic_udp_tunnel_unset_port,
237 	.flags		= UDP_TUNNEL_NIC_INFO_IPV4_ONLY,
238 	.tables		= {
239 		{ .n_entries = 1, .tunnel_types = UDP_TUNNEL_TYPE_VXLAN, },
240 	},
241 };
242 
243 static netdev_features_t enic_features_check(struct sk_buff *skb,
244 					     struct net_device *dev,
245 					     netdev_features_t features)
246 {
247 	const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
248 	struct enic *enic = netdev_priv(dev);
249 	struct udphdr *udph;
250 	u16 port = 0;
251 	u8 proto;
252 
253 	if (!skb->encapsulation)
254 		return features;
255 
256 	features = vxlan_features_check(skb, features);
257 
258 	switch (vlan_get_protocol(skb)) {
259 	case htons(ETH_P_IPV6):
260 		if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6))
261 			goto out;
262 		proto = ipv6_hdr(skb)->nexthdr;
263 		break;
264 	case htons(ETH_P_IP):
265 		proto = ip_hdr(skb)->protocol;
266 		break;
267 	default:
268 		goto out;
269 	}
270 
271 	switch (eth->h_proto) {
272 	case ntohs(ETH_P_IPV6):
273 		if (!(enic->vxlan.flags & ENIC_VXLAN_INNER_IPV6))
274 			goto out;
275 		fallthrough;
276 	case ntohs(ETH_P_IP):
277 		break;
278 	default:
279 		goto out;
280 	}
281 
282 
283 	if (proto == IPPROTO_UDP) {
284 		udph = udp_hdr(skb);
285 		port = be16_to_cpu(udph->dest);
286 	}
287 
288 	/* HW supports offload of only one UDP port. Remove CSUM and GSO MASK
289 	 * for other UDP port tunnels
290 	 */
291 	if (port  != enic->vxlan.vxlan_udp_port_number)
292 		goto out;
293 
294 	return features;
295 
296 out:
297 	return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
298 }
299 
300 int enic_is_dynamic(struct enic *enic)
301 {
302 	return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
303 }
304 
305 int enic_sriov_enabled(struct enic *enic)
306 {
307 	return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
308 }
309 
310 static int enic_is_sriov_vf(struct enic *enic)
311 {
312 	return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
313 }
314 
315 int enic_is_valid_vf(struct enic *enic, int vf)
316 {
317 #ifdef CONFIG_PCI_IOV
318 	return vf >= 0 && vf < enic->num_vfs;
319 #else
320 	return 0;
321 #endif
322 }
323 
324 static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
325 {
326 	struct enic *enic = vnic_dev_priv(wq->vdev);
327 
328 	if (buf->sop)
329 		dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len,
330 				 DMA_TO_DEVICE);
331 	else
332 		dma_unmap_page(&enic->pdev->dev, buf->dma_addr, buf->len,
333 			       DMA_TO_DEVICE);
334 
335 	if (buf->os_buf)
336 		dev_kfree_skb_any(buf->os_buf);
337 }
338 
339 static void enic_wq_free_buf(struct vnic_wq *wq,
340 	struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
341 {
342 	enic_free_wq_buf(wq, buf);
343 }
344 
345 static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
346 	u8 type, u16 q_number, u16 completed_index, void *opaque)
347 {
348 	struct enic *enic = vnic_dev_priv(vdev);
349 
350 	spin_lock(&enic->wq_lock[q_number]);
351 
352 	vnic_wq_service(&enic->wq[q_number], cq_desc,
353 		completed_index, enic_wq_free_buf,
354 		opaque);
355 
356 	if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
357 	    vnic_wq_desc_avail(&enic->wq[q_number]) >=
358 	    (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
359 		netif_wake_subqueue(enic->netdev, q_number);
360 
361 	spin_unlock(&enic->wq_lock[q_number]);
362 
363 	return 0;
364 }
365 
366 static bool enic_log_q_error(struct enic *enic)
367 {
368 	unsigned int i;
369 	u32 error_status;
370 	bool err = false;
371 
372 	for (i = 0; i < enic->wq_count; i++) {
373 		error_status = vnic_wq_error_status(&enic->wq[i]);
374 		err |= error_status;
375 		if (error_status)
376 			netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
377 				i, error_status);
378 	}
379 
380 	for (i = 0; i < enic->rq_count; i++) {
381 		error_status = vnic_rq_error_status(&enic->rq[i]);
382 		err |= error_status;
383 		if (error_status)
384 			netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
385 				i, error_status);
386 	}
387 
388 	return err;
389 }
390 
391 static void enic_msglvl_check(struct enic *enic)
392 {
393 	u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
394 
395 	if (msg_enable != enic->msg_enable) {
396 		netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
397 			enic->msg_enable, msg_enable);
398 		enic->msg_enable = msg_enable;
399 	}
400 }
401 
402 static void enic_mtu_check(struct enic *enic)
403 {
404 	u32 mtu = vnic_dev_mtu(enic->vdev);
405 	struct net_device *netdev = enic->netdev;
406 
407 	if (mtu && mtu != enic->port_mtu) {
408 		enic->port_mtu = mtu;
409 		if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
410 			mtu = max_t(int, ENIC_MIN_MTU,
411 				min_t(int, ENIC_MAX_MTU, mtu));
412 			if (mtu != netdev->mtu)
413 				schedule_work(&enic->change_mtu_work);
414 		} else {
415 			if (mtu < netdev->mtu)
416 				netdev_warn(netdev,
417 					"interface MTU (%d) set higher "
418 					"than switch port MTU (%d)\n",
419 					netdev->mtu, mtu);
420 		}
421 	}
422 }
423 
424 static void enic_link_check(struct enic *enic)
425 {
426 	int link_status = vnic_dev_link_status(enic->vdev);
427 	int carrier_ok = netif_carrier_ok(enic->netdev);
428 
429 	if (link_status && !carrier_ok) {
430 		netdev_info(enic->netdev, "Link UP\n");
431 		netif_carrier_on(enic->netdev);
432 	} else if (!link_status && carrier_ok) {
433 		netdev_info(enic->netdev, "Link DOWN\n");
434 		netif_carrier_off(enic->netdev);
435 	}
436 }
437 
438 static void enic_notify_check(struct enic *enic)
439 {
440 	enic_msglvl_check(enic);
441 	enic_mtu_check(enic);
442 	enic_link_check(enic);
443 }
444 
445 #define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
446 
447 static irqreturn_t enic_isr_legacy(int irq, void *data)
448 {
449 	struct net_device *netdev = data;
450 	struct enic *enic = netdev_priv(netdev);
451 	unsigned int io_intr = enic_legacy_io_intr();
452 	unsigned int err_intr = enic_legacy_err_intr();
453 	unsigned int notify_intr = enic_legacy_notify_intr();
454 	u32 pba;
455 
456 	vnic_intr_mask(&enic->intr[io_intr]);
457 
458 	pba = vnic_intr_legacy_pba(enic->legacy_pba);
459 	if (!pba) {
460 		vnic_intr_unmask(&enic->intr[io_intr]);
461 		return IRQ_NONE;	/* not our interrupt */
462 	}
463 
464 	if (ENIC_TEST_INTR(pba, notify_intr)) {
465 		enic_notify_check(enic);
466 		vnic_intr_return_all_credits(&enic->intr[notify_intr]);
467 	}
468 
469 	if (ENIC_TEST_INTR(pba, err_intr)) {
470 		vnic_intr_return_all_credits(&enic->intr[err_intr]);
471 		enic_log_q_error(enic);
472 		/* schedule recovery from WQ/RQ error */
473 		schedule_work(&enic->reset);
474 		return IRQ_HANDLED;
475 	}
476 
477 	if (ENIC_TEST_INTR(pba, io_intr))
478 		napi_schedule_irqoff(&enic->napi[0]);
479 	else
480 		vnic_intr_unmask(&enic->intr[io_intr]);
481 
482 	return IRQ_HANDLED;
483 }
484 
485 static irqreturn_t enic_isr_msi(int irq, void *data)
486 {
487 	struct enic *enic = data;
488 
489 	/* With MSI, there is no sharing of interrupts, so this is
490 	 * our interrupt and there is no need to ack it.  The device
491 	 * is not providing per-vector masking, so the OS will not
492 	 * write to PCI config space to mask/unmask the interrupt.
493 	 * We're using mask_on_assertion for MSI, so the device
494 	 * automatically masks the interrupt when the interrupt is
495 	 * generated.  Later, when exiting polling, the interrupt
496 	 * will be unmasked (see enic_poll).
497 	 *
498 	 * Also, the device uses the same PCIe Traffic Class (TC)
499 	 * for Memory Write data and MSI, so there are no ordering
500 	 * issues; the MSI will always arrive at the Root Complex
501 	 * _after_ corresponding Memory Writes (i.e. descriptor
502 	 * writes).
503 	 */
504 
505 	napi_schedule_irqoff(&enic->napi[0]);
506 
507 	return IRQ_HANDLED;
508 }
509 
510 static irqreturn_t enic_isr_msix(int irq, void *data)
511 {
512 	struct napi_struct *napi = data;
513 
514 	napi_schedule_irqoff(napi);
515 
516 	return IRQ_HANDLED;
517 }
518 
519 static irqreturn_t enic_isr_msix_err(int irq, void *data)
520 {
521 	struct enic *enic = data;
522 	unsigned int intr = enic_msix_err_intr(enic);
523 
524 	vnic_intr_return_all_credits(&enic->intr[intr]);
525 
526 	if (enic_log_q_error(enic))
527 		/* schedule recovery from WQ/RQ error */
528 		schedule_work(&enic->reset);
529 
530 	return IRQ_HANDLED;
531 }
532 
533 static irqreturn_t enic_isr_msix_notify(int irq, void *data)
534 {
535 	struct enic *enic = data;
536 	unsigned int intr = enic_msix_notify_intr(enic);
537 
538 	enic_notify_check(enic);
539 	vnic_intr_return_all_credits(&enic->intr[intr]);
540 
541 	return IRQ_HANDLED;
542 }
543 
544 static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
545 				  struct sk_buff *skb, unsigned int len_left,
546 				  int loopback)
547 {
548 	const skb_frag_t *frag;
549 	dma_addr_t dma_addr;
550 
551 	/* Queue additional data fragments */
552 	for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
553 		len_left -= skb_frag_size(frag);
554 		dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
555 					    skb_frag_size(frag),
556 					    DMA_TO_DEVICE);
557 		if (unlikely(enic_dma_map_check(enic, dma_addr)))
558 			return -ENOMEM;
559 		enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
560 					(len_left == 0),	/* EOP? */
561 					loopback);
562 	}
563 
564 	return 0;
565 }
566 
567 static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
568 				  struct sk_buff *skb, int vlan_tag_insert,
569 				  unsigned int vlan_tag, int loopback)
570 {
571 	unsigned int head_len = skb_headlen(skb);
572 	unsigned int len_left = skb->len - head_len;
573 	int eop = (len_left == 0);
574 	dma_addr_t dma_addr;
575 	int err = 0;
576 
577 	dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len,
578 				  DMA_TO_DEVICE);
579 	if (unlikely(enic_dma_map_check(enic, dma_addr)))
580 		return -ENOMEM;
581 
582 	/* Queue the main skb fragment. The fragments are no larger
583 	 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
584 	 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
585 	 * per fragment is queued.
586 	 */
587 	enic_queue_wq_desc(wq, skb, dma_addr, head_len,	vlan_tag_insert,
588 			   vlan_tag, eop, loopback);
589 
590 	if (!eop)
591 		err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
592 
593 	return err;
594 }
595 
596 static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
597 				     struct sk_buff *skb, int vlan_tag_insert,
598 				     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 	unsigned int hdr_len = skb_checksum_start_offset(skb);
603 	unsigned int csum_offset = hdr_len + skb->csum_offset;
604 	int eop = (len_left == 0);
605 	dma_addr_t dma_addr;
606 	int err = 0;
607 
608 	dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len,
609 				  DMA_TO_DEVICE);
610 	if (unlikely(enic_dma_map_check(enic, dma_addr)))
611 		return -ENOMEM;
612 
613 	/* Queue the main skb fragment. The fragments are no larger
614 	 * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
615 	 * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
616 	 * per fragment is queued.
617 	 */
618 	enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len,	csum_offset,
619 				   hdr_len, vlan_tag_insert, vlan_tag, eop,
620 				   loopback);
621 
622 	if (!eop)
623 		err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
624 
625 	return err;
626 }
627 
628 static void enic_preload_tcp_csum_encap(struct sk_buff *skb)
629 {
630 	const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
631 
632 	switch (eth->h_proto) {
633 	case ntohs(ETH_P_IP):
634 		inner_ip_hdr(skb)->check = 0;
635 		inner_tcp_hdr(skb)->check =
636 			~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
637 					   inner_ip_hdr(skb)->daddr, 0,
638 					   IPPROTO_TCP, 0);
639 		break;
640 	case ntohs(ETH_P_IPV6):
641 		inner_tcp_hdr(skb)->check =
642 			~csum_ipv6_magic(&inner_ipv6_hdr(skb)->saddr,
643 					 &inner_ipv6_hdr(skb)->daddr, 0,
644 					 IPPROTO_TCP, 0);
645 		break;
646 	default:
647 		WARN_ONCE(1, "Non ipv4/ipv6 inner pkt for encap offload");
648 		break;
649 	}
650 }
651 
652 static void enic_preload_tcp_csum(struct sk_buff *skb)
653 {
654 	/* Preload TCP csum field with IP pseudo hdr calculated
655 	 * with IP length set to zero.  HW will later add in length
656 	 * to each TCP segment resulting from the TSO.
657 	 */
658 
659 	if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
660 		ip_hdr(skb)->check = 0;
661 		tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
662 			ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
663 	} else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
664 		tcp_v6_gso_csum_prep(skb);
665 	}
666 }
667 
668 static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
669 				 struct sk_buff *skb, unsigned int mss,
670 				 int vlan_tag_insert, unsigned int vlan_tag,
671 				 int loopback)
672 {
673 	unsigned int frag_len_left = skb_headlen(skb);
674 	unsigned int len_left = skb->len - frag_len_left;
675 	int eop = (len_left == 0);
676 	unsigned int offset = 0;
677 	unsigned int hdr_len;
678 	dma_addr_t dma_addr;
679 	unsigned int len;
680 	skb_frag_t *frag;
681 
682 	if (skb->encapsulation) {
683 		hdr_len = skb_inner_tcp_all_headers(skb);
684 		enic_preload_tcp_csum_encap(skb);
685 	} else {
686 		hdr_len = skb_tcp_all_headers(skb);
687 		enic_preload_tcp_csum(skb);
688 	}
689 
690 	/* Queue WQ_ENET_MAX_DESC_LEN length descriptors
691 	 * for the main skb fragment
692 	 */
693 	while (frag_len_left) {
694 		len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
695 		dma_addr = dma_map_single(&enic->pdev->dev,
696 					  skb->data + offset, len,
697 					  DMA_TO_DEVICE);
698 		if (unlikely(enic_dma_map_check(enic, dma_addr)))
699 			return -ENOMEM;
700 		enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
701 				       vlan_tag_insert, vlan_tag,
702 				       eop && (len == frag_len_left), loopback);
703 		frag_len_left -= len;
704 		offset += len;
705 	}
706 
707 	if (eop)
708 		return 0;
709 
710 	/* Queue WQ_ENET_MAX_DESC_LEN length descriptors
711 	 * for additional data fragments
712 	 */
713 	for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
714 		len_left -= skb_frag_size(frag);
715 		frag_len_left = skb_frag_size(frag);
716 		offset = 0;
717 
718 		while (frag_len_left) {
719 			len = min(frag_len_left,
720 				(unsigned int)WQ_ENET_MAX_DESC_LEN);
721 			dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
722 						    offset, len,
723 						    DMA_TO_DEVICE);
724 			if (unlikely(enic_dma_map_check(enic, dma_addr)))
725 				return -ENOMEM;
726 			enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
727 						(len_left == 0) &&
728 						 (len == frag_len_left),/*EOP*/
729 						loopback);
730 			frag_len_left -= len;
731 			offset += len;
732 		}
733 	}
734 
735 	return 0;
736 }
737 
738 static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq,
739 					  struct sk_buff *skb,
740 					  int vlan_tag_insert,
741 					  unsigned int vlan_tag, int loopback)
742 {
743 	unsigned int head_len = skb_headlen(skb);
744 	unsigned int len_left = skb->len - head_len;
745 	/* Hardware will overwrite the checksum fields, calculating from
746 	 * scratch and ignoring the value placed by software.
747 	 * Offload mode = 00
748 	 * mss[2], mss[1], mss[0] bits are set
749 	 */
750 	unsigned int mss_or_csum = 7;
751 	int eop = (len_left == 0);
752 	dma_addr_t dma_addr;
753 	int err = 0;
754 
755 	dma_addr = dma_map_single(&enic->pdev->dev, skb->data, head_len,
756 				  DMA_TO_DEVICE);
757 	if (unlikely(enic_dma_map_check(enic, dma_addr)))
758 		return -ENOMEM;
759 
760 	enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0,
761 			      vlan_tag_insert, vlan_tag,
762 			      WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop,
763 			      loopback);
764 	if (!eop)
765 		err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
766 
767 	return err;
768 }
769 
770 static inline int enic_queue_wq_skb(struct enic *enic,
771 	struct vnic_wq *wq, struct sk_buff *skb)
772 {
773 	unsigned int mss = skb_shinfo(skb)->gso_size;
774 	unsigned int vlan_tag = 0;
775 	int vlan_tag_insert = 0;
776 	int loopback = 0;
777 	int err;
778 
779 	if (skb_vlan_tag_present(skb)) {
780 		/* VLAN tag from trunking driver */
781 		vlan_tag_insert = 1;
782 		vlan_tag = skb_vlan_tag_get(skb);
783 	} else if (enic->loop_enable) {
784 		vlan_tag = enic->loop_tag;
785 		loopback = 1;
786 	}
787 
788 	if (mss)
789 		err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
790 					    vlan_tag_insert, vlan_tag,
791 					    loopback);
792 	else if (skb->encapsulation)
793 		err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert,
794 					      vlan_tag, loopback);
795 	else if	(skb->ip_summed == CHECKSUM_PARTIAL)
796 		err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
797 						vlan_tag, loopback);
798 	else
799 		err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
800 					     vlan_tag, loopback);
801 	if (unlikely(err)) {
802 		struct vnic_wq_buf *buf;
803 
804 		buf = wq->to_use->prev;
805 		/* while not EOP of previous pkt && queue not empty.
806 		 * For all non EOP bufs, os_buf is NULL.
807 		 */
808 		while (!buf->os_buf && (buf->next != wq->to_clean)) {
809 			enic_free_wq_buf(wq, buf);
810 			wq->ring.desc_avail++;
811 			buf = buf->prev;
812 		}
813 		wq->to_use = buf->next;
814 		dev_kfree_skb(skb);
815 	}
816 	return err;
817 }
818 
819 /* netif_tx_lock held, process context with BHs disabled, or BH */
820 static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
821 	struct net_device *netdev)
822 {
823 	struct enic *enic = netdev_priv(netdev);
824 	struct vnic_wq *wq;
825 	unsigned int txq_map;
826 	struct netdev_queue *txq;
827 
828 	if (skb->len <= 0) {
829 		dev_kfree_skb_any(skb);
830 		return NETDEV_TX_OK;
831 	}
832 
833 	txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
834 	wq = &enic->wq[txq_map];
835 	txq = netdev_get_tx_queue(netdev, txq_map);
836 
837 	/* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
838 	 * which is very likely.  In the off chance it's going to take
839 	 * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
840 	 */
841 
842 	if (skb_shinfo(skb)->gso_size == 0 &&
843 	    skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
844 	    skb_linearize(skb)) {
845 		dev_kfree_skb_any(skb);
846 		return NETDEV_TX_OK;
847 	}
848 
849 	spin_lock(&enic->wq_lock[txq_map]);
850 
851 	if (vnic_wq_desc_avail(wq) <
852 	    skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
853 		netif_tx_stop_queue(txq);
854 		/* This is a hard error, log it */
855 		netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
856 		spin_unlock(&enic->wq_lock[txq_map]);
857 		return NETDEV_TX_BUSY;
858 	}
859 
860 	if (enic_queue_wq_skb(enic, wq, skb))
861 		goto error;
862 
863 	if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
864 		netif_tx_stop_queue(txq);
865 	skb_tx_timestamp(skb);
866 	if (!netdev_xmit_more() || netif_xmit_stopped(txq))
867 		vnic_wq_doorbell(wq);
868 
869 error:
870 	spin_unlock(&enic->wq_lock[txq_map]);
871 
872 	return NETDEV_TX_OK;
873 }
874 
875 /* dev_base_lock rwlock held, nominally process context */
876 static void enic_get_stats(struct net_device *netdev,
877 			   struct rtnl_link_stats64 *net_stats)
878 {
879 	struct enic *enic = netdev_priv(netdev);
880 	struct vnic_stats *stats;
881 	int err;
882 
883 	err = enic_dev_stats_dump(enic, &stats);
884 	/* return only when dma_alloc_coherent fails in vnic_dev_stats_dump
885 	 * For other failures, like devcmd failure, we return previously
886 	 * recorded stats.
887 	 */
888 	if (err == -ENOMEM)
889 		return;
890 
891 	net_stats->tx_packets = stats->tx.tx_frames_ok;
892 	net_stats->tx_bytes = stats->tx.tx_bytes_ok;
893 	net_stats->tx_errors = stats->tx.tx_errors;
894 	net_stats->tx_dropped = stats->tx.tx_drops;
895 
896 	net_stats->rx_packets = stats->rx.rx_frames_ok;
897 	net_stats->rx_bytes = stats->rx.rx_bytes_ok;
898 	net_stats->rx_errors = stats->rx.rx_errors;
899 	net_stats->multicast = stats->rx.rx_multicast_frames_ok;
900 	net_stats->rx_over_errors = enic->rq_truncated_pkts;
901 	net_stats->rx_crc_errors = enic->rq_bad_fcs;
902 	net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
903 }
904 
905 static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
906 {
907 	struct enic *enic = netdev_priv(netdev);
908 
909 	if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
910 		unsigned int mc_count = netdev_mc_count(netdev);
911 
912 		netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
913 			    ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
914 
915 		return -ENOSPC;
916 	}
917 
918 	enic_dev_add_addr(enic, mc_addr);
919 	enic->mc_count++;
920 
921 	return 0;
922 }
923 
924 static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
925 {
926 	struct enic *enic = netdev_priv(netdev);
927 
928 	enic_dev_del_addr(enic, mc_addr);
929 	enic->mc_count--;
930 
931 	return 0;
932 }
933 
934 static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
935 {
936 	struct enic *enic = netdev_priv(netdev);
937 
938 	if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
939 		unsigned int uc_count = netdev_uc_count(netdev);
940 
941 		netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
942 			    ENIC_UNICAST_PERFECT_FILTERS, uc_count);
943 
944 		return -ENOSPC;
945 	}
946 
947 	enic_dev_add_addr(enic, uc_addr);
948 	enic->uc_count++;
949 
950 	return 0;
951 }
952 
953 static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
954 {
955 	struct enic *enic = netdev_priv(netdev);
956 
957 	enic_dev_del_addr(enic, uc_addr);
958 	enic->uc_count--;
959 
960 	return 0;
961 }
962 
963 void enic_reset_addr_lists(struct enic *enic)
964 {
965 	struct net_device *netdev = enic->netdev;
966 
967 	__dev_uc_unsync(netdev, NULL);
968 	__dev_mc_unsync(netdev, NULL);
969 
970 	enic->mc_count = 0;
971 	enic->uc_count = 0;
972 	enic->flags = 0;
973 }
974 
975 static int enic_set_mac_addr(struct net_device *netdev, char *addr)
976 {
977 	struct enic *enic = netdev_priv(netdev);
978 
979 	if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
980 		if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
981 			return -EADDRNOTAVAIL;
982 	} else {
983 		if (!is_valid_ether_addr(addr))
984 			return -EADDRNOTAVAIL;
985 	}
986 
987 	eth_hw_addr_set(netdev, addr);
988 
989 	return 0;
990 }
991 
992 static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
993 {
994 	struct enic *enic = netdev_priv(netdev);
995 	struct sockaddr *saddr = p;
996 	char *addr = saddr->sa_data;
997 	int err;
998 
999 	if (netif_running(enic->netdev)) {
1000 		err = enic_dev_del_station_addr(enic);
1001 		if (err)
1002 			return err;
1003 	}
1004 
1005 	err = enic_set_mac_addr(netdev, addr);
1006 	if (err)
1007 		return err;
1008 
1009 	if (netif_running(enic->netdev)) {
1010 		err = enic_dev_add_station_addr(enic);
1011 		if (err)
1012 			return err;
1013 	}
1014 
1015 	return err;
1016 }
1017 
1018 static int enic_set_mac_address(struct net_device *netdev, void *p)
1019 {
1020 	struct sockaddr *saddr = p;
1021 	char *addr = saddr->sa_data;
1022 	struct enic *enic = netdev_priv(netdev);
1023 	int err;
1024 
1025 	err = enic_dev_del_station_addr(enic);
1026 	if (err)
1027 		return err;
1028 
1029 	err = enic_set_mac_addr(netdev, addr);
1030 	if (err)
1031 		return err;
1032 
1033 	return enic_dev_add_station_addr(enic);
1034 }
1035 
1036 /* netif_tx_lock held, BHs disabled */
1037 static void enic_set_rx_mode(struct net_device *netdev)
1038 {
1039 	struct enic *enic = netdev_priv(netdev);
1040 	int directed = 1;
1041 	int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
1042 	int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
1043 	int promisc = (netdev->flags & IFF_PROMISC) ||
1044 		netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
1045 	int allmulti = (netdev->flags & IFF_ALLMULTI) ||
1046 		netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
1047 	unsigned int flags = netdev->flags |
1048 		(allmulti ? IFF_ALLMULTI : 0) |
1049 		(promisc ? IFF_PROMISC : 0);
1050 
1051 	if (enic->flags != flags) {
1052 		enic->flags = flags;
1053 		enic_dev_packet_filter(enic, directed,
1054 			multicast, broadcast, promisc, allmulti);
1055 	}
1056 
1057 	if (!promisc) {
1058 		__dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
1059 		if (!allmulti)
1060 			__dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
1061 	}
1062 }
1063 
1064 /* netif_tx_lock held, BHs disabled */
1065 static void enic_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1066 {
1067 	struct enic *enic = netdev_priv(netdev);
1068 	schedule_work(&enic->tx_hang_reset);
1069 }
1070 
1071 static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
1072 {
1073 	struct enic *enic = netdev_priv(netdev);
1074 	struct enic_port_profile *pp;
1075 	int err;
1076 
1077 	ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1078 	if (err)
1079 		return err;
1080 
1081 	if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
1082 		if (vf == PORT_SELF_VF) {
1083 			memcpy(pp->vf_mac, mac, ETH_ALEN);
1084 			return 0;
1085 		} else {
1086 			/*
1087 			 * For sriov vf's set the mac in hw
1088 			 */
1089 			ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1090 				vnic_dev_set_mac_addr, mac);
1091 			return enic_dev_status_to_errno(err);
1092 		}
1093 	} else
1094 		return -EINVAL;
1095 }
1096 
1097 static int enic_set_vf_port(struct net_device *netdev, int vf,
1098 	struct nlattr *port[])
1099 {
1100 	static const u8 zero_addr[ETH_ALEN] = {};
1101 	struct enic *enic = netdev_priv(netdev);
1102 	struct enic_port_profile prev_pp;
1103 	struct enic_port_profile *pp;
1104 	int err = 0, restore_pp = 1;
1105 
1106 	ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1107 	if (err)
1108 		return err;
1109 
1110 	if (!port[IFLA_PORT_REQUEST])
1111 		return -EOPNOTSUPP;
1112 
1113 	memcpy(&prev_pp, pp, sizeof(*enic->pp));
1114 	memset(pp, 0, sizeof(*enic->pp));
1115 
1116 	pp->set |= ENIC_SET_REQUEST;
1117 	pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
1118 
1119 	if (port[IFLA_PORT_PROFILE]) {
1120 		pp->set |= ENIC_SET_NAME;
1121 		memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
1122 			PORT_PROFILE_MAX);
1123 	}
1124 
1125 	if (port[IFLA_PORT_INSTANCE_UUID]) {
1126 		pp->set |= ENIC_SET_INSTANCE;
1127 		memcpy(pp->instance_uuid,
1128 			nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
1129 	}
1130 
1131 	if (port[IFLA_PORT_HOST_UUID]) {
1132 		pp->set |= ENIC_SET_HOST;
1133 		memcpy(pp->host_uuid,
1134 			nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
1135 	}
1136 
1137 	if (vf == PORT_SELF_VF) {
1138 		/* Special case handling: mac came from IFLA_VF_MAC */
1139 		if (!is_zero_ether_addr(prev_pp.vf_mac))
1140 			memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
1141 
1142 		if (is_zero_ether_addr(netdev->dev_addr))
1143 			eth_hw_addr_random(netdev);
1144 	} else {
1145 		/* SR-IOV VF: get mac from adapter */
1146 		ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1147 			vnic_dev_get_mac_addr, pp->mac_addr);
1148 		if (err) {
1149 			netdev_err(netdev, "Error getting mac for vf %d\n", vf);
1150 			memcpy(pp, &prev_pp, sizeof(*pp));
1151 			return enic_dev_status_to_errno(err);
1152 		}
1153 	}
1154 
1155 	err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
1156 	if (err) {
1157 		if (restore_pp) {
1158 			/* Things are still the way they were: Implicit
1159 			 * DISASSOCIATE failed
1160 			 */
1161 			memcpy(pp, &prev_pp, sizeof(*pp));
1162 		} else {
1163 			memset(pp, 0, sizeof(*pp));
1164 			if (vf == PORT_SELF_VF)
1165 				eth_hw_addr_set(netdev, zero_addr);
1166 		}
1167 	} else {
1168 		/* Set flag to indicate that the port assoc/disassoc
1169 		 * request has been sent out to fw
1170 		 */
1171 		pp->set |= ENIC_PORT_REQUEST_APPLIED;
1172 
1173 		/* If DISASSOCIATE, clean up all assigned/saved macaddresses */
1174 		if (pp->request == PORT_REQUEST_DISASSOCIATE) {
1175 			eth_zero_addr(pp->mac_addr);
1176 			if (vf == PORT_SELF_VF)
1177 				eth_hw_addr_set(netdev, zero_addr);
1178 		}
1179 	}
1180 
1181 	if (vf == PORT_SELF_VF)
1182 		eth_zero_addr(pp->vf_mac);
1183 
1184 	return err;
1185 }
1186 
1187 static int enic_get_vf_port(struct net_device *netdev, int vf,
1188 	struct sk_buff *skb)
1189 {
1190 	struct enic *enic = netdev_priv(netdev);
1191 	u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
1192 	struct enic_port_profile *pp;
1193 	int err;
1194 
1195 	ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1196 	if (err)
1197 		return err;
1198 
1199 	if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
1200 		return -ENODATA;
1201 
1202 	err = enic_process_get_pp_request(enic, vf, pp->request, &response);
1203 	if (err)
1204 		return err;
1205 
1206 	if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
1207 	    nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
1208 	    ((pp->set & ENIC_SET_NAME) &&
1209 	     nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
1210 	    ((pp->set & ENIC_SET_INSTANCE) &&
1211 	     nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
1212 		     pp->instance_uuid)) ||
1213 	    ((pp->set & ENIC_SET_HOST) &&
1214 	     nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
1215 		goto nla_put_failure;
1216 	return 0;
1217 
1218 nla_put_failure:
1219 	return -EMSGSIZE;
1220 }
1221 
1222 static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1223 {
1224 	struct enic *enic = vnic_dev_priv(rq->vdev);
1225 
1226 	if (!buf->os_buf)
1227 		return;
1228 
1229 	dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len,
1230 			 DMA_FROM_DEVICE);
1231 	dev_kfree_skb_any(buf->os_buf);
1232 	buf->os_buf = NULL;
1233 }
1234 
1235 static int enic_rq_alloc_buf(struct vnic_rq *rq)
1236 {
1237 	struct enic *enic = vnic_dev_priv(rq->vdev);
1238 	struct net_device *netdev = enic->netdev;
1239 	struct sk_buff *skb;
1240 	unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
1241 	unsigned int os_buf_index = 0;
1242 	dma_addr_t dma_addr;
1243 	struct vnic_rq_buf *buf = rq->to_use;
1244 
1245 	if (buf->os_buf) {
1246 		enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
1247 				   buf->len);
1248 
1249 		return 0;
1250 	}
1251 	skb = netdev_alloc_skb_ip_align(netdev, len);
1252 	if (!skb)
1253 		return -ENOMEM;
1254 
1255 	dma_addr = dma_map_single(&enic->pdev->dev, skb->data, len,
1256 				  DMA_FROM_DEVICE);
1257 	if (unlikely(enic_dma_map_check(enic, dma_addr))) {
1258 		dev_kfree_skb(skb);
1259 		return -ENOMEM;
1260 	}
1261 
1262 	enic_queue_rq_desc(rq, skb, os_buf_index,
1263 		dma_addr, len);
1264 
1265 	return 0;
1266 }
1267 
1268 static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1269 				      u32 pkt_len)
1270 {
1271 	if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1272 		pkt_size->large_pkt_bytes_cnt += pkt_len;
1273 	else
1274 		pkt_size->small_pkt_bytes_cnt += pkt_len;
1275 }
1276 
1277 static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1278 			     struct vnic_rq_buf *buf, u16 len)
1279 {
1280 	struct enic *enic = netdev_priv(netdev);
1281 	struct sk_buff *new_skb;
1282 
1283 	if (len > enic->rx_copybreak)
1284 		return false;
1285 	new_skb = netdev_alloc_skb_ip_align(netdev, len);
1286 	if (!new_skb)
1287 		return false;
1288 	dma_sync_single_for_cpu(&enic->pdev->dev, buf->dma_addr, len,
1289 				DMA_FROM_DEVICE);
1290 	memcpy(new_skb->data, (*skb)->data, len);
1291 	*skb = new_skb;
1292 
1293 	return true;
1294 }
1295 
1296 static void enic_rq_indicate_buf(struct vnic_rq *rq,
1297 	struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1298 	int skipped, void *opaque)
1299 {
1300 	struct enic *enic = vnic_dev_priv(rq->vdev);
1301 	struct net_device *netdev = enic->netdev;
1302 	struct sk_buff *skb;
1303 	struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1304 
1305 	u8 type, color, eop, sop, ingress_port, vlan_stripped;
1306 	u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1307 	u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1308 	u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1309 	u8 packet_error;
1310 	u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1311 	u32 rss_hash;
1312 	bool outer_csum_ok = true, encap = false;
1313 
1314 	if (skipped)
1315 		return;
1316 
1317 	skb = buf->os_buf;
1318 
1319 	cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1320 		&type, &color, &q_number, &completed_index,
1321 		&ingress_port, &fcoe, &eop, &sop, &rss_type,
1322 		&csum_not_calc, &rss_hash, &bytes_written,
1323 		&packet_error, &vlan_stripped, &vlan_tci, &checksum,
1324 		&fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1325 		&fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1326 		&ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1327 		&fcs_ok);
1328 
1329 	if (packet_error) {
1330 
1331 		if (!fcs_ok) {
1332 			if (bytes_written > 0)
1333 				enic->rq_bad_fcs++;
1334 			else if (bytes_written == 0)
1335 				enic->rq_truncated_pkts++;
1336 		}
1337 
1338 		dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len,
1339 				 DMA_FROM_DEVICE);
1340 		dev_kfree_skb_any(skb);
1341 		buf->os_buf = NULL;
1342 
1343 		return;
1344 	}
1345 
1346 	if (eop && bytes_written > 0) {
1347 
1348 		/* Good receive
1349 		 */
1350 
1351 		if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1352 			buf->os_buf = NULL;
1353 			dma_unmap_single(&enic->pdev->dev, buf->dma_addr,
1354 					 buf->len, DMA_FROM_DEVICE);
1355 		}
1356 		prefetch(skb->data - NET_IP_ALIGN);
1357 
1358 		skb_put(skb, bytes_written);
1359 		skb->protocol = eth_type_trans(skb, netdev);
1360 		skb_record_rx_queue(skb, q_number);
1361 		if ((netdev->features & NETIF_F_RXHASH) && rss_hash &&
1362 		    (type == 3)) {
1363 			switch (rss_type) {
1364 			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv4:
1365 			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6:
1366 			case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6_EX:
1367 				skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L4);
1368 				break;
1369 			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv4:
1370 			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6:
1371 			case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6_EX:
1372 				skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L3);
1373 				break;
1374 			}
1375 		}
1376 		if (enic->vxlan.vxlan_udp_port_number) {
1377 			switch (enic->vxlan.patch_level) {
1378 			case 0:
1379 				if (fcoe) {
1380 					encap = true;
1381 					outer_csum_ok = fcoe_fc_crc_ok;
1382 				}
1383 				break;
1384 			case 2:
1385 				if ((type == 7) &&
1386 				    (rss_hash & BIT(0))) {
1387 					encap = true;
1388 					outer_csum_ok = (rss_hash & BIT(1)) &&
1389 							(rss_hash & BIT(2));
1390 				}
1391 				break;
1392 			}
1393 		}
1394 
1395 		/* Hardware does not provide whole packet checksum. It only
1396 		 * provides pseudo checksum. Since hw validates the packet
1397 		 * checksum but not provide us the checksum value. use
1398 		 * CHECSUM_UNNECESSARY.
1399 		 *
1400 		 * In case of encap pkt tcp_udp_csum_ok/tcp_udp_csum_ok is
1401 		 * inner csum_ok. outer_csum_ok is set by hw when outer udp
1402 		 * csum is correct or is zero.
1403 		 */
1404 		if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc &&
1405 		    tcp_udp_csum_ok && outer_csum_ok &&
1406 		    (ipv4_csum_ok || ipv6)) {
1407 			skb->ip_summed = CHECKSUM_UNNECESSARY;
1408 			skb->csum_level = encap;
1409 		}
1410 
1411 		if (vlan_stripped)
1412 			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1413 
1414 		skb_mark_napi_id(skb, &enic->napi[rq->index]);
1415 		if (!(netdev->features & NETIF_F_GRO))
1416 			netif_receive_skb(skb);
1417 		else
1418 			napi_gro_receive(&enic->napi[q_number], skb);
1419 		if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1420 			enic_intr_update_pkt_size(&cq->pkt_size_counter,
1421 						  bytes_written);
1422 	} else {
1423 
1424 		/* Buffer overflow
1425 		 */
1426 
1427 		dma_unmap_single(&enic->pdev->dev, buf->dma_addr, buf->len,
1428 				 DMA_FROM_DEVICE);
1429 		dev_kfree_skb_any(skb);
1430 		buf->os_buf = NULL;
1431 	}
1432 }
1433 
1434 static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1435 	u8 type, u16 q_number, u16 completed_index, void *opaque)
1436 {
1437 	struct enic *enic = vnic_dev_priv(vdev);
1438 
1439 	vnic_rq_service(&enic->rq[q_number], cq_desc,
1440 		completed_index, VNIC_RQ_RETURN_DESC,
1441 		enic_rq_indicate_buf, opaque);
1442 
1443 	return 0;
1444 }
1445 
1446 static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1447 {
1448 	unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1449 	struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1450 	u32 timer = cq->tobe_rx_coal_timeval;
1451 
1452 	if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1453 		vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1454 		cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1455 	}
1456 }
1457 
1458 static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1459 {
1460 	struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1461 	struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1462 	struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1463 	int index;
1464 	u32 timer;
1465 	u32 range_start;
1466 	u32 traffic;
1467 	u64 delta;
1468 	ktime_t now = ktime_get();
1469 
1470 	delta = ktime_us_delta(now, cq->prev_ts);
1471 	if (delta < ENIC_AIC_TS_BREAK)
1472 		return;
1473 	cq->prev_ts = now;
1474 
1475 	traffic = pkt_size_counter->large_pkt_bytes_cnt +
1476 		  pkt_size_counter->small_pkt_bytes_cnt;
1477 	/* The table takes Mbps
1478 	 * traffic *= 8    => bits
1479 	 * traffic *= (10^6 / delta)    => bps
1480 	 * traffic /= 10^6     => Mbps
1481 	 *
1482 	 * Combining, traffic *= (8 / delta)
1483 	 */
1484 
1485 	traffic <<= 3;
1486 	traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1487 
1488 	for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1489 		if (traffic < mod_table[index].rx_rate)
1490 			break;
1491 	range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1492 		       pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1493 		      rx_coal->small_pkt_range_start :
1494 		      rx_coal->large_pkt_range_start;
1495 	timer = range_start + ((rx_coal->range_end - range_start) *
1496 			       mod_table[index].range_percent / 100);
1497 	/* Damping */
1498 	cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1499 
1500 	pkt_size_counter->large_pkt_bytes_cnt = 0;
1501 	pkt_size_counter->small_pkt_bytes_cnt = 0;
1502 }
1503 
1504 static int enic_poll(struct napi_struct *napi, int budget)
1505 {
1506 	struct net_device *netdev = napi->dev;
1507 	struct enic *enic = netdev_priv(netdev);
1508 	unsigned int cq_rq = enic_cq_rq(enic, 0);
1509 	unsigned int cq_wq = enic_cq_wq(enic, 0);
1510 	unsigned int intr = enic_legacy_io_intr();
1511 	unsigned int rq_work_to_do = budget;
1512 	unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
1513 	unsigned int  work_done, rq_work_done = 0, wq_work_done;
1514 	int err;
1515 
1516 	wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1517 				       enic_wq_service, NULL);
1518 
1519 	if (budget > 0)
1520 		rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1521 			rq_work_to_do, enic_rq_service, NULL);
1522 
1523 	/* Accumulate intr event credits for this polling
1524 	 * cycle.  An intr event is the completion of a
1525 	 * a WQ or RQ packet.
1526 	 */
1527 
1528 	work_done = rq_work_done + wq_work_done;
1529 
1530 	if (work_done > 0)
1531 		vnic_intr_return_credits(&enic->intr[intr],
1532 			work_done,
1533 			0 /* don't unmask intr */,
1534 			0 /* don't reset intr timer */);
1535 
1536 	err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1537 
1538 	/* Buffer allocation failed. Stay in polling
1539 	 * mode so we can try to fill the ring again.
1540 	 */
1541 
1542 	if (err)
1543 		rq_work_done = rq_work_to_do;
1544 	if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1545 		/* Call the function which refreshes the intr coalescing timer
1546 		 * value based on the traffic.
1547 		 */
1548 		enic_calc_int_moderation(enic, &enic->rq[0]);
1549 
1550 	if ((rq_work_done < budget) && napi_complete_done(napi, rq_work_done)) {
1551 
1552 		/* Some work done, but not enough to stay in polling,
1553 		 * exit polling
1554 		 */
1555 
1556 		if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1557 			enic_set_int_moderation(enic, &enic->rq[0]);
1558 		vnic_intr_unmask(&enic->intr[intr]);
1559 	}
1560 
1561 	return rq_work_done;
1562 }
1563 
1564 #ifdef CONFIG_RFS_ACCEL
1565 static void enic_free_rx_cpu_rmap(struct enic *enic)
1566 {
1567 	free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1568 	enic->netdev->rx_cpu_rmap = NULL;
1569 }
1570 
1571 static void enic_set_rx_cpu_rmap(struct enic *enic)
1572 {
1573 	int i, res;
1574 
1575 	if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1576 		enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1577 		if (unlikely(!enic->netdev->rx_cpu_rmap))
1578 			return;
1579 		for (i = 0; i < enic->rq_count; i++) {
1580 			res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1581 					       enic->msix_entry[i].vector);
1582 			if (unlikely(res)) {
1583 				enic_free_rx_cpu_rmap(enic);
1584 				return;
1585 			}
1586 		}
1587 	}
1588 }
1589 
1590 #else
1591 
1592 static void enic_free_rx_cpu_rmap(struct enic *enic)
1593 {
1594 }
1595 
1596 static void enic_set_rx_cpu_rmap(struct enic *enic)
1597 {
1598 }
1599 
1600 #endif /* CONFIG_RFS_ACCEL */
1601 
1602 static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1603 {
1604 	struct net_device *netdev = napi->dev;
1605 	struct enic *enic = netdev_priv(netdev);
1606 	unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1607 	struct vnic_wq *wq = &enic->wq[wq_index];
1608 	unsigned int cq;
1609 	unsigned int intr;
1610 	unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
1611 	unsigned int wq_work_done;
1612 	unsigned int wq_irq;
1613 
1614 	wq_irq = wq->index;
1615 	cq = enic_cq_wq(enic, wq_irq);
1616 	intr = enic_msix_wq_intr(enic, wq_irq);
1617 	wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1618 				       enic_wq_service, NULL);
1619 
1620 	vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1621 				 0 /* don't unmask intr */,
1622 				 1 /* reset intr timer */);
1623 	if (!wq_work_done) {
1624 		napi_complete(napi);
1625 		vnic_intr_unmask(&enic->intr[intr]);
1626 		return 0;
1627 	}
1628 
1629 	return budget;
1630 }
1631 
1632 static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1633 {
1634 	struct net_device *netdev = napi->dev;
1635 	struct enic *enic = netdev_priv(netdev);
1636 	unsigned int rq = (napi - &enic->napi[0]);
1637 	unsigned int cq = enic_cq_rq(enic, rq);
1638 	unsigned int intr = enic_msix_rq_intr(enic, rq);
1639 	unsigned int work_to_do = budget;
1640 	unsigned int work_done = 0;
1641 	int err;
1642 
1643 	/* Service RQ
1644 	 */
1645 
1646 	if (budget > 0)
1647 		work_done = vnic_cq_service(&enic->cq[cq],
1648 			work_to_do, enic_rq_service, NULL);
1649 
1650 	/* Return intr event credits for this polling
1651 	 * cycle.  An intr event is the completion of a
1652 	 * RQ packet.
1653 	 */
1654 
1655 	if (work_done > 0)
1656 		vnic_intr_return_credits(&enic->intr[intr],
1657 			work_done,
1658 			0 /* don't unmask intr */,
1659 			0 /* don't reset intr timer */);
1660 
1661 	err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1662 
1663 	/* Buffer allocation failed. Stay in polling mode
1664 	 * so we can try to fill the ring again.
1665 	 */
1666 
1667 	if (err)
1668 		work_done = work_to_do;
1669 	if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1670 		/* Call the function which refreshes the intr coalescing timer
1671 		 * value based on the traffic.
1672 		 */
1673 		enic_calc_int_moderation(enic, &enic->rq[rq]);
1674 
1675 	if ((work_done < budget) && napi_complete_done(napi, work_done)) {
1676 
1677 		/* Some work done, but not enough to stay in polling,
1678 		 * exit polling
1679 		 */
1680 
1681 		if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1682 			enic_set_int_moderation(enic, &enic->rq[rq]);
1683 		vnic_intr_unmask(&enic->intr[intr]);
1684 	}
1685 
1686 	return work_done;
1687 }
1688 
1689 static void enic_notify_timer(struct timer_list *t)
1690 {
1691 	struct enic *enic = from_timer(enic, t, notify_timer);
1692 
1693 	enic_notify_check(enic);
1694 
1695 	mod_timer(&enic->notify_timer,
1696 		round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1697 }
1698 
1699 static void enic_free_intr(struct enic *enic)
1700 {
1701 	struct net_device *netdev = enic->netdev;
1702 	unsigned int i;
1703 
1704 	enic_free_rx_cpu_rmap(enic);
1705 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
1706 	case VNIC_DEV_INTR_MODE_INTX:
1707 		free_irq(enic->pdev->irq, netdev);
1708 		break;
1709 	case VNIC_DEV_INTR_MODE_MSI:
1710 		free_irq(enic->pdev->irq, enic);
1711 		break;
1712 	case VNIC_DEV_INTR_MODE_MSIX:
1713 		for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1714 			if (enic->msix[i].requested)
1715 				free_irq(enic->msix_entry[i].vector,
1716 					enic->msix[i].devid);
1717 		break;
1718 	default:
1719 		break;
1720 	}
1721 }
1722 
1723 static int enic_request_intr(struct enic *enic)
1724 {
1725 	struct net_device *netdev = enic->netdev;
1726 	unsigned int i, intr;
1727 	int err = 0;
1728 
1729 	enic_set_rx_cpu_rmap(enic);
1730 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
1731 
1732 	case VNIC_DEV_INTR_MODE_INTX:
1733 
1734 		err = request_irq(enic->pdev->irq, enic_isr_legacy,
1735 			IRQF_SHARED, netdev->name, netdev);
1736 		break;
1737 
1738 	case VNIC_DEV_INTR_MODE_MSI:
1739 
1740 		err = request_irq(enic->pdev->irq, enic_isr_msi,
1741 			0, netdev->name, enic);
1742 		break;
1743 
1744 	case VNIC_DEV_INTR_MODE_MSIX:
1745 
1746 		for (i = 0; i < enic->rq_count; i++) {
1747 			intr = enic_msix_rq_intr(enic, i);
1748 			snprintf(enic->msix[intr].devname,
1749 				sizeof(enic->msix[intr].devname),
1750 				"%s-rx-%u", netdev->name, i);
1751 			enic->msix[intr].isr = enic_isr_msix;
1752 			enic->msix[intr].devid = &enic->napi[i];
1753 		}
1754 
1755 		for (i = 0; i < enic->wq_count; i++) {
1756 			int wq = enic_cq_wq(enic, i);
1757 
1758 			intr = enic_msix_wq_intr(enic, i);
1759 			snprintf(enic->msix[intr].devname,
1760 				sizeof(enic->msix[intr].devname),
1761 				"%s-tx-%u", netdev->name, i);
1762 			enic->msix[intr].isr = enic_isr_msix;
1763 			enic->msix[intr].devid = &enic->napi[wq];
1764 		}
1765 
1766 		intr = enic_msix_err_intr(enic);
1767 		snprintf(enic->msix[intr].devname,
1768 			sizeof(enic->msix[intr].devname),
1769 			"%s-err", netdev->name);
1770 		enic->msix[intr].isr = enic_isr_msix_err;
1771 		enic->msix[intr].devid = enic;
1772 
1773 		intr = enic_msix_notify_intr(enic);
1774 		snprintf(enic->msix[intr].devname,
1775 			sizeof(enic->msix[intr].devname),
1776 			"%s-notify", netdev->name);
1777 		enic->msix[intr].isr = enic_isr_msix_notify;
1778 		enic->msix[intr].devid = enic;
1779 
1780 		for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1781 			enic->msix[i].requested = 0;
1782 
1783 		for (i = 0; i < enic->intr_count; i++) {
1784 			err = request_irq(enic->msix_entry[i].vector,
1785 				enic->msix[i].isr, 0,
1786 				enic->msix[i].devname,
1787 				enic->msix[i].devid);
1788 			if (err) {
1789 				enic_free_intr(enic);
1790 				break;
1791 			}
1792 			enic->msix[i].requested = 1;
1793 		}
1794 
1795 		break;
1796 
1797 	default:
1798 		break;
1799 	}
1800 
1801 	return err;
1802 }
1803 
1804 static void enic_synchronize_irqs(struct enic *enic)
1805 {
1806 	unsigned int i;
1807 
1808 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
1809 	case VNIC_DEV_INTR_MODE_INTX:
1810 	case VNIC_DEV_INTR_MODE_MSI:
1811 		synchronize_irq(enic->pdev->irq);
1812 		break;
1813 	case VNIC_DEV_INTR_MODE_MSIX:
1814 		for (i = 0; i < enic->intr_count; i++)
1815 			synchronize_irq(enic->msix_entry[i].vector);
1816 		break;
1817 	default:
1818 		break;
1819 	}
1820 }
1821 
1822 static void enic_set_rx_coal_setting(struct enic *enic)
1823 {
1824 	unsigned int speed;
1825 	int index = -1;
1826 	struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1827 
1828 	/* 1. Read the link speed from fw
1829 	 * 2. Pick the default range for the speed
1830 	 * 3. Update it in enic->rx_coalesce_setting
1831 	 */
1832 	speed = vnic_dev_port_speed(enic->vdev);
1833 	if (ENIC_LINK_SPEED_10G < speed)
1834 		index = ENIC_LINK_40G_INDEX;
1835 	else if (ENIC_LINK_SPEED_4G < speed)
1836 		index = ENIC_LINK_10G_INDEX;
1837 	else
1838 		index = ENIC_LINK_4G_INDEX;
1839 
1840 	rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1841 	rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1842 	rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1843 
1844 	/* Start with the value provided by UCSM */
1845 	for (index = 0; index < enic->rq_count; index++)
1846 		enic->cq[index].cur_rx_coal_timeval =
1847 				enic->config.intr_timer_usec;
1848 
1849 	rx_coal->use_adaptive_rx_coalesce = 1;
1850 }
1851 
1852 static int enic_dev_notify_set(struct enic *enic)
1853 {
1854 	int err;
1855 
1856 	spin_lock_bh(&enic->devcmd_lock);
1857 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
1858 	case VNIC_DEV_INTR_MODE_INTX:
1859 		err = vnic_dev_notify_set(enic->vdev,
1860 			enic_legacy_notify_intr());
1861 		break;
1862 	case VNIC_DEV_INTR_MODE_MSIX:
1863 		err = vnic_dev_notify_set(enic->vdev,
1864 			enic_msix_notify_intr(enic));
1865 		break;
1866 	default:
1867 		err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1868 		break;
1869 	}
1870 	spin_unlock_bh(&enic->devcmd_lock);
1871 
1872 	return err;
1873 }
1874 
1875 static void enic_notify_timer_start(struct enic *enic)
1876 {
1877 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
1878 	case VNIC_DEV_INTR_MODE_MSI:
1879 		mod_timer(&enic->notify_timer, jiffies);
1880 		break;
1881 	default:
1882 		/* Using intr for notification for INTx/MSI-X */
1883 		break;
1884 	}
1885 }
1886 
1887 /* rtnl lock is held, process context */
1888 static int enic_open(struct net_device *netdev)
1889 {
1890 	struct enic *enic = netdev_priv(netdev);
1891 	unsigned int i;
1892 	int err, ret;
1893 
1894 	err = enic_request_intr(enic);
1895 	if (err) {
1896 		netdev_err(netdev, "Unable to request irq.\n");
1897 		return err;
1898 	}
1899 	enic_init_affinity_hint(enic);
1900 	enic_set_affinity_hint(enic);
1901 
1902 	err = enic_dev_notify_set(enic);
1903 	if (err) {
1904 		netdev_err(netdev,
1905 			"Failed to alloc notify buffer, aborting.\n");
1906 		goto err_out_free_intr;
1907 	}
1908 
1909 	for (i = 0; i < enic->rq_count; i++) {
1910 		/* enable rq before updating rq desc */
1911 		vnic_rq_enable(&enic->rq[i]);
1912 		vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1913 		/* Need at least one buffer on ring to get going */
1914 		if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1915 			netdev_err(netdev, "Unable to alloc receive buffers\n");
1916 			err = -ENOMEM;
1917 			goto err_out_free_rq;
1918 		}
1919 	}
1920 
1921 	for (i = 0; i < enic->wq_count; i++)
1922 		vnic_wq_enable(&enic->wq[i]);
1923 
1924 	if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1925 		enic_dev_add_station_addr(enic);
1926 
1927 	enic_set_rx_mode(netdev);
1928 
1929 	netif_tx_wake_all_queues(netdev);
1930 
1931 	for (i = 0; i < enic->rq_count; i++)
1932 		napi_enable(&enic->napi[i]);
1933 
1934 	if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1935 		for (i = 0; i < enic->wq_count; i++)
1936 			napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1937 	enic_dev_enable(enic);
1938 
1939 	for (i = 0; i < enic->intr_count; i++)
1940 		vnic_intr_unmask(&enic->intr[i]);
1941 
1942 	enic_notify_timer_start(enic);
1943 	enic_rfs_timer_start(enic);
1944 
1945 	return 0;
1946 
1947 err_out_free_rq:
1948 	for (i = 0; i < enic->rq_count; i++) {
1949 		ret = vnic_rq_disable(&enic->rq[i]);
1950 		if (!ret)
1951 			vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1952 	}
1953 	enic_dev_notify_unset(enic);
1954 err_out_free_intr:
1955 	enic_unset_affinity_hint(enic);
1956 	enic_free_intr(enic);
1957 
1958 	return err;
1959 }
1960 
1961 /* rtnl lock is held, process context */
1962 static int enic_stop(struct net_device *netdev)
1963 {
1964 	struct enic *enic = netdev_priv(netdev);
1965 	unsigned int i;
1966 	int err;
1967 
1968 	for (i = 0; i < enic->intr_count; i++) {
1969 		vnic_intr_mask(&enic->intr[i]);
1970 		(void)vnic_intr_masked(&enic->intr[i]); /* flush write */
1971 	}
1972 
1973 	enic_synchronize_irqs(enic);
1974 
1975 	del_timer_sync(&enic->notify_timer);
1976 	enic_rfs_flw_tbl_free(enic);
1977 
1978 	enic_dev_disable(enic);
1979 
1980 	for (i = 0; i < enic->rq_count; i++)
1981 		napi_disable(&enic->napi[i]);
1982 
1983 	netif_carrier_off(netdev);
1984 	if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1985 		for (i = 0; i < enic->wq_count; i++)
1986 			napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
1987 	netif_tx_disable(netdev);
1988 
1989 	if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1990 		enic_dev_del_station_addr(enic);
1991 
1992 	for (i = 0; i < enic->wq_count; i++) {
1993 		err = vnic_wq_disable(&enic->wq[i]);
1994 		if (err)
1995 			return err;
1996 	}
1997 	for (i = 0; i < enic->rq_count; i++) {
1998 		err = vnic_rq_disable(&enic->rq[i]);
1999 		if (err)
2000 			return err;
2001 	}
2002 
2003 	enic_dev_notify_unset(enic);
2004 	enic_unset_affinity_hint(enic);
2005 	enic_free_intr(enic);
2006 
2007 	for (i = 0; i < enic->wq_count; i++)
2008 		vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
2009 	for (i = 0; i < enic->rq_count; i++)
2010 		vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
2011 	for (i = 0; i < enic->cq_count; i++)
2012 		vnic_cq_clean(&enic->cq[i]);
2013 	for (i = 0; i < enic->intr_count; i++)
2014 		vnic_intr_clean(&enic->intr[i]);
2015 
2016 	return 0;
2017 }
2018 
2019 static int _enic_change_mtu(struct net_device *netdev, int new_mtu)
2020 {
2021 	bool running = netif_running(netdev);
2022 	int err = 0;
2023 
2024 	ASSERT_RTNL();
2025 	if (running) {
2026 		err = enic_stop(netdev);
2027 		if (err)
2028 			return err;
2029 	}
2030 
2031 	netdev->mtu = new_mtu;
2032 
2033 	if (running) {
2034 		err = enic_open(netdev);
2035 		if (err)
2036 			return err;
2037 	}
2038 
2039 	return 0;
2040 }
2041 
2042 static int enic_change_mtu(struct net_device *netdev, int new_mtu)
2043 {
2044 	struct enic *enic = netdev_priv(netdev);
2045 
2046 	if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2047 		return -EOPNOTSUPP;
2048 
2049 	if (netdev->mtu > enic->port_mtu)
2050 		netdev_warn(netdev,
2051 			    "interface MTU (%d) set higher than port MTU (%d)\n",
2052 			    netdev->mtu, enic->port_mtu);
2053 
2054 	return _enic_change_mtu(netdev, new_mtu);
2055 }
2056 
2057 static void enic_change_mtu_work(struct work_struct *work)
2058 {
2059 	struct enic *enic = container_of(work, struct enic, change_mtu_work);
2060 	struct net_device *netdev = enic->netdev;
2061 	int new_mtu = vnic_dev_mtu(enic->vdev);
2062 
2063 	rtnl_lock();
2064 	(void)_enic_change_mtu(netdev, new_mtu);
2065 	rtnl_unlock();
2066 
2067 	netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
2068 }
2069 
2070 #ifdef CONFIG_NET_POLL_CONTROLLER
2071 static void enic_poll_controller(struct net_device *netdev)
2072 {
2073 	struct enic *enic = netdev_priv(netdev);
2074 	struct vnic_dev *vdev = enic->vdev;
2075 	unsigned int i, intr;
2076 
2077 	switch (vnic_dev_get_intr_mode(vdev)) {
2078 	case VNIC_DEV_INTR_MODE_MSIX:
2079 		for (i = 0; i < enic->rq_count; i++) {
2080 			intr = enic_msix_rq_intr(enic, i);
2081 			enic_isr_msix(enic->msix_entry[intr].vector,
2082 				      &enic->napi[i]);
2083 		}
2084 
2085 		for (i = 0; i < enic->wq_count; i++) {
2086 			intr = enic_msix_wq_intr(enic, i);
2087 			enic_isr_msix(enic->msix_entry[intr].vector,
2088 				      &enic->napi[enic_cq_wq(enic, i)]);
2089 		}
2090 
2091 		break;
2092 	case VNIC_DEV_INTR_MODE_MSI:
2093 		enic_isr_msi(enic->pdev->irq, enic);
2094 		break;
2095 	case VNIC_DEV_INTR_MODE_INTX:
2096 		enic_isr_legacy(enic->pdev->irq, netdev);
2097 		break;
2098 	default:
2099 		break;
2100 	}
2101 }
2102 #endif
2103 
2104 static int enic_dev_wait(struct vnic_dev *vdev,
2105 	int (*start)(struct vnic_dev *, int),
2106 	int (*finished)(struct vnic_dev *, int *),
2107 	int arg)
2108 {
2109 	unsigned long time;
2110 	int done;
2111 	int err;
2112 
2113 	err = start(vdev, arg);
2114 	if (err)
2115 		return err;
2116 
2117 	/* Wait for func to complete...2 seconds max
2118 	 */
2119 
2120 	time = jiffies + (HZ * 2);
2121 	do {
2122 
2123 		err = finished(vdev, &done);
2124 		if (err)
2125 			return err;
2126 
2127 		if (done)
2128 			return 0;
2129 
2130 		schedule_timeout_uninterruptible(HZ / 10);
2131 
2132 	} while (time_after(time, jiffies));
2133 
2134 	return -ETIMEDOUT;
2135 }
2136 
2137 static int enic_dev_open(struct enic *enic)
2138 {
2139 	int err;
2140 	u32 flags = CMD_OPENF_IG_DESCCACHE;
2141 
2142 	err = enic_dev_wait(enic->vdev, vnic_dev_open,
2143 		vnic_dev_open_done, flags);
2144 	if (err)
2145 		dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
2146 			err);
2147 
2148 	return err;
2149 }
2150 
2151 static int enic_dev_soft_reset(struct enic *enic)
2152 {
2153 	int err;
2154 
2155 	err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
2156 			    vnic_dev_soft_reset_done, 0);
2157 	if (err)
2158 		netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n",
2159 			   err);
2160 
2161 	return err;
2162 }
2163 
2164 static int enic_dev_hang_reset(struct enic *enic)
2165 {
2166 	int err;
2167 
2168 	err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
2169 		vnic_dev_hang_reset_done, 0);
2170 	if (err)
2171 		netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
2172 			err);
2173 
2174 	return err;
2175 }
2176 
2177 int __enic_set_rsskey(struct enic *enic)
2178 {
2179 	union vnic_rss_key *rss_key_buf_va;
2180 	dma_addr_t rss_key_buf_pa;
2181 	int i, kidx, bidx, err;
2182 
2183 	rss_key_buf_va = dma_alloc_coherent(&enic->pdev->dev,
2184 					    sizeof(union vnic_rss_key),
2185 					    &rss_key_buf_pa, GFP_ATOMIC);
2186 	if (!rss_key_buf_va)
2187 		return -ENOMEM;
2188 
2189 	for (i = 0; i < ENIC_RSS_LEN; i++) {
2190 		kidx = i / ENIC_RSS_BYTES_PER_KEY;
2191 		bidx = i % ENIC_RSS_BYTES_PER_KEY;
2192 		rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
2193 	}
2194 	spin_lock_bh(&enic->devcmd_lock);
2195 	err = enic_set_rss_key(enic,
2196 		rss_key_buf_pa,
2197 		sizeof(union vnic_rss_key));
2198 	spin_unlock_bh(&enic->devcmd_lock);
2199 
2200 	dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_key),
2201 			  rss_key_buf_va, rss_key_buf_pa);
2202 
2203 	return err;
2204 }
2205 
2206 static int enic_set_rsskey(struct enic *enic)
2207 {
2208 	netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
2209 
2210 	return __enic_set_rsskey(enic);
2211 }
2212 
2213 static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
2214 {
2215 	dma_addr_t rss_cpu_buf_pa;
2216 	union vnic_rss_cpu *rss_cpu_buf_va = NULL;
2217 	unsigned int i;
2218 	int err;
2219 
2220 	rss_cpu_buf_va = dma_alloc_coherent(&enic->pdev->dev,
2221 					    sizeof(union vnic_rss_cpu),
2222 					    &rss_cpu_buf_pa, GFP_ATOMIC);
2223 	if (!rss_cpu_buf_va)
2224 		return -ENOMEM;
2225 
2226 	for (i = 0; i < (1 << rss_hash_bits); i++)
2227 		(*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
2228 
2229 	spin_lock_bh(&enic->devcmd_lock);
2230 	err = enic_set_rss_cpu(enic,
2231 		rss_cpu_buf_pa,
2232 		sizeof(union vnic_rss_cpu));
2233 	spin_unlock_bh(&enic->devcmd_lock);
2234 
2235 	dma_free_coherent(&enic->pdev->dev, sizeof(union vnic_rss_cpu),
2236 			  rss_cpu_buf_va, rss_cpu_buf_pa);
2237 
2238 	return err;
2239 }
2240 
2241 static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2242 	u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2243 {
2244 	const u8 tso_ipid_split_en = 0;
2245 	const u8 ig_vlan_strip_en = 1;
2246 	int err;
2247 
2248 	/* Enable VLAN tag stripping.
2249 	*/
2250 
2251 	spin_lock_bh(&enic->devcmd_lock);
2252 	err = enic_set_nic_cfg(enic,
2253 		rss_default_cpu, rss_hash_type,
2254 		rss_hash_bits, rss_base_cpu,
2255 		rss_enable, tso_ipid_split_en,
2256 		ig_vlan_strip_en);
2257 	spin_unlock_bh(&enic->devcmd_lock);
2258 
2259 	return err;
2260 }
2261 
2262 static int enic_set_rss_nic_cfg(struct enic *enic)
2263 {
2264 	struct device *dev = enic_get_dev(enic);
2265 	const u8 rss_default_cpu = 0;
2266 	const u8 rss_hash_bits = 7;
2267 	const u8 rss_base_cpu = 0;
2268 	u8 rss_hash_type;
2269 	int res;
2270 	u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2271 
2272 	spin_lock_bh(&enic->devcmd_lock);
2273 	res = vnic_dev_capable_rss_hash_type(enic->vdev, &rss_hash_type);
2274 	spin_unlock_bh(&enic->devcmd_lock);
2275 	if (res) {
2276 		/* defaults for old adapters
2277 		 */
2278 		rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4	|
2279 				NIC_CFG_RSS_HASH_TYPE_TCP_IPV4	|
2280 				NIC_CFG_RSS_HASH_TYPE_IPV6	|
2281 				NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2282 	}
2283 
2284 	if (rss_enable) {
2285 		if (!enic_set_rsskey(enic)) {
2286 			if (enic_set_rsscpu(enic, rss_hash_bits)) {
2287 				rss_enable = 0;
2288 				dev_warn(dev, "RSS disabled, "
2289 					"Failed to set RSS cpu indirection table.");
2290 			}
2291 		} else {
2292 			rss_enable = 0;
2293 			dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2294 		}
2295 	}
2296 
2297 	return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2298 		rss_hash_bits, rss_base_cpu, rss_enable);
2299 }
2300 
2301 static void enic_set_api_busy(struct enic *enic, bool busy)
2302 {
2303 	spin_lock(&enic->enic_api_lock);
2304 	enic->enic_api_busy = busy;
2305 	spin_unlock(&enic->enic_api_lock);
2306 }
2307 
2308 static void enic_reset(struct work_struct *work)
2309 {
2310 	struct enic *enic = container_of(work, struct enic, reset);
2311 
2312 	if (!netif_running(enic->netdev))
2313 		return;
2314 
2315 	rtnl_lock();
2316 
2317 	/* Stop any activity from infiniband */
2318 	enic_set_api_busy(enic, true);
2319 
2320 	enic_stop(enic->netdev);
2321 	enic_dev_soft_reset(enic);
2322 	enic_reset_addr_lists(enic);
2323 	enic_init_vnic_resources(enic);
2324 	enic_set_rss_nic_cfg(enic);
2325 	enic_dev_set_ig_vlan_rewrite_mode(enic);
2326 	enic_open(enic->netdev);
2327 
2328 	/* Allow infiniband to fiddle with the device again */
2329 	enic_set_api_busy(enic, false);
2330 
2331 	call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2332 
2333 	rtnl_unlock();
2334 }
2335 
2336 static void enic_tx_hang_reset(struct work_struct *work)
2337 {
2338 	struct enic *enic = container_of(work, struct enic, tx_hang_reset);
2339 
2340 	rtnl_lock();
2341 
2342 	/* Stop any activity from infiniband */
2343 	enic_set_api_busy(enic, true);
2344 
2345 	enic_dev_hang_notify(enic);
2346 	enic_stop(enic->netdev);
2347 	enic_dev_hang_reset(enic);
2348 	enic_reset_addr_lists(enic);
2349 	enic_init_vnic_resources(enic);
2350 	enic_set_rss_nic_cfg(enic);
2351 	enic_dev_set_ig_vlan_rewrite_mode(enic);
2352 	enic_open(enic->netdev);
2353 
2354 	/* Allow infiniband to fiddle with the device again */
2355 	enic_set_api_busy(enic, false);
2356 
2357 	call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2358 
2359 	rtnl_unlock();
2360 }
2361 
2362 static int enic_set_intr_mode(struct enic *enic)
2363 {
2364 	unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2365 	unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2366 	unsigned int i;
2367 
2368 	/* Set interrupt mode (INTx, MSI, MSI-X) depending
2369 	 * on system capabilities.
2370 	 *
2371 	 * Try MSI-X first
2372 	 *
2373 	 * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2374 	 * (the second to last INTR is used for WQ/RQ errors)
2375 	 * (the last INTR is used for notifications)
2376 	 */
2377 
2378 	BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2379 	for (i = 0; i < n + m + 2; i++)
2380 		enic->msix_entry[i].entry = i;
2381 
2382 	/* Use multiple RQs if RSS is enabled
2383 	 */
2384 
2385 	if (ENIC_SETTING(enic, RSS) &&
2386 	    enic->config.intr_mode < 1 &&
2387 	    enic->rq_count >= n &&
2388 	    enic->wq_count >= m &&
2389 	    enic->cq_count >= n + m &&
2390 	    enic->intr_count >= n + m + 2) {
2391 
2392 		if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2393 					  n + m + 2, n + m + 2) > 0) {
2394 
2395 			enic->rq_count = n;
2396 			enic->wq_count = m;
2397 			enic->cq_count = n + m;
2398 			enic->intr_count = n + m + 2;
2399 
2400 			vnic_dev_set_intr_mode(enic->vdev,
2401 				VNIC_DEV_INTR_MODE_MSIX);
2402 
2403 			return 0;
2404 		}
2405 	}
2406 
2407 	if (enic->config.intr_mode < 1 &&
2408 	    enic->rq_count >= 1 &&
2409 	    enic->wq_count >= m &&
2410 	    enic->cq_count >= 1 + m &&
2411 	    enic->intr_count >= 1 + m + 2) {
2412 		if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2413 					  1 + m + 2, 1 + m + 2) > 0) {
2414 
2415 			enic->rq_count = 1;
2416 			enic->wq_count = m;
2417 			enic->cq_count = 1 + m;
2418 			enic->intr_count = 1 + m + 2;
2419 
2420 			vnic_dev_set_intr_mode(enic->vdev,
2421 				VNIC_DEV_INTR_MODE_MSIX);
2422 
2423 			return 0;
2424 		}
2425 	}
2426 
2427 	/* Next try MSI
2428 	 *
2429 	 * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2430 	 */
2431 
2432 	if (enic->config.intr_mode < 2 &&
2433 	    enic->rq_count >= 1 &&
2434 	    enic->wq_count >= 1 &&
2435 	    enic->cq_count >= 2 &&
2436 	    enic->intr_count >= 1 &&
2437 	    !pci_enable_msi(enic->pdev)) {
2438 
2439 		enic->rq_count = 1;
2440 		enic->wq_count = 1;
2441 		enic->cq_count = 2;
2442 		enic->intr_count = 1;
2443 
2444 		vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2445 
2446 		return 0;
2447 	}
2448 
2449 	/* Next try INTx
2450 	 *
2451 	 * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2452 	 * (the first INTR is used for WQ/RQ)
2453 	 * (the second INTR is used for WQ/RQ errors)
2454 	 * (the last INTR is used for notifications)
2455 	 */
2456 
2457 	if (enic->config.intr_mode < 3 &&
2458 	    enic->rq_count >= 1 &&
2459 	    enic->wq_count >= 1 &&
2460 	    enic->cq_count >= 2 &&
2461 	    enic->intr_count >= 3) {
2462 
2463 		enic->rq_count = 1;
2464 		enic->wq_count = 1;
2465 		enic->cq_count = 2;
2466 		enic->intr_count = 3;
2467 
2468 		vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2469 
2470 		return 0;
2471 	}
2472 
2473 	vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2474 
2475 	return -EINVAL;
2476 }
2477 
2478 static void enic_clear_intr_mode(struct enic *enic)
2479 {
2480 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
2481 	case VNIC_DEV_INTR_MODE_MSIX:
2482 		pci_disable_msix(enic->pdev);
2483 		break;
2484 	case VNIC_DEV_INTR_MODE_MSI:
2485 		pci_disable_msi(enic->pdev);
2486 		break;
2487 	default:
2488 		break;
2489 	}
2490 
2491 	vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2492 }
2493 
2494 static const struct net_device_ops enic_netdev_dynamic_ops = {
2495 	.ndo_open		= enic_open,
2496 	.ndo_stop		= enic_stop,
2497 	.ndo_start_xmit		= enic_hard_start_xmit,
2498 	.ndo_get_stats64	= enic_get_stats,
2499 	.ndo_validate_addr	= eth_validate_addr,
2500 	.ndo_set_rx_mode	= enic_set_rx_mode,
2501 	.ndo_set_mac_address	= enic_set_mac_address_dynamic,
2502 	.ndo_change_mtu		= enic_change_mtu,
2503 	.ndo_vlan_rx_add_vid	= enic_vlan_rx_add_vid,
2504 	.ndo_vlan_rx_kill_vid	= enic_vlan_rx_kill_vid,
2505 	.ndo_tx_timeout		= enic_tx_timeout,
2506 	.ndo_set_vf_port	= enic_set_vf_port,
2507 	.ndo_get_vf_port	= enic_get_vf_port,
2508 	.ndo_set_vf_mac		= enic_set_vf_mac,
2509 #ifdef CONFIG_NET_POLL_CONTROLLER
2510 	.ndo_poll_controller	= enic_poll_controller,
2511 #endif
2512 #ifdef CONFIG_RFS_ACCEL
2513 	.ndo_rx_flow_steer	= enic_rx_flow_steer,
2514 #endif
2515 	.ndo_features_check	= enic_features_check,
2516 };
2517 
2518 static const struct net_device_ops enic_netdev_ops = {
2519 	.ndo_open		= enic_open,
2520 	.ndo_stop		= enic_stop,
2521 	.ndo_start_xmit		= enic_hard_start_xmit,
2522 	.ndo_get_stats64	= enic_get_stats,
2523 	.ndo_validate_addr	= eth_validate_addr,
2524 	.ndo_set_mac_address	= enic_set_mac_address,
2525 	.ndo_set_rx_mode	= enic_set_rx_mode,
2526 	.ndo_change_mtu		= enic_change_mtu,
2527 	.ndo_vlan_rx_add_vid	= enic_vlan_rx_add_vid,
2528 	.ndo_vlan_rx_kill_vid	= enic_vlan_rx_kill_vid,
2529 	.ndo_tx_timeout		= enic_tx_timeout,
2530 	.ndo_set_vf_port	= enic_set_vf_port,
2531 	.ndo_get_vf_port	= enic_get_vf_port,
2532 	.ndo_set_vf_mac		= enic_set_vf_mac,
2533 #ifdef CONFIG_NET_POLL_CONTROLLER
2534 	.ndo_poll_controller	= enic_poll_controller,
2535 #endif
2536 #ifdef CONFIG_RFS_ACCEL
2537 	.ndo_rx_flow_steer	= enic_rx_flow_steer,
2538 #endif
2539 	.ndo_features_check	= enic_features_check,
2540 };
2541 
2542 static void enic_dev_deinit(struct enic *enic)
2543 {
2544 	unsigned int i;
2545 
2546 	for (i = 0; i < enic->rq_count; i++)
2547 		__netif_napi_del(&enic->napi[i]);
2548 
2549 	if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2550 		for (i = 0; i < enic->wq_count; i++)
2551 			__netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2552 
2553 	/* observe RCU grace period after __netif_napi_del() calls */
2554 	synchronize_net();
2555 
2556 	enic_free_vnic_resources(enic);
2557 	enic_clear_intr_mode(enic);
2558 	enic_free_affinity_hint(enic);
2559 }
2560 
2561 static void enic_kdump_kernel_config(struct enic *enic)
2562 {
2563 	if (is_kdump_kernel()) {
2564 		dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2565 		enic->rq_count = 1;
2566 		enic->wq_count = 1;
2567 		enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2568 		enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2569 		enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2570 	}
2571 }
2572 
2573 static int enic_dev_init(struct enic *enic)
2574 {
2575 	struct device *dev = enic_get_dev(enic);
2576 	struct net_device *netdev = enic->netdev;
2577 	unsigned int i;
2578 	int err;
2579 
2580 	/* Get interrupt coalesce timer info */
2581 	err = enic_dev_intr_coal_timer_info(enic);
2582 	if (err) {
2583 		dev_warn(dev, "Using default conversion factor for "
2584 			"interrupt coalesce timer\n");
2585 		vnic_dev_intr_coal_timer_info_default(enic->vdev);
2586 	}
2587 
2588 	/* Get vNIC configuration
2589 	 */
2590 
2591 	err = enic_get_vnic_config(enic);
2592 	if (err) {
2593 		dev_err(dev, "Get vNIC configuration failed, aborting\n");
2594 		return err;
2595 	}
2596 
2597 	/* Get available resource counts
2598 	 */
2599 
2600 	enic_get_res_counts(enic);
2601 
2602 	/* modify resource count if we are in kdump_kernel
2603 	 */
2604 	enic_kdump_kernel_config(enic);
2605 
2606 	/* Set interrupt mode based on resource counts and system
2607 	 * capabilities
2608 	 */
2609 
2610 	err = enic_set_intr_mode(enic);
2611 	if (err) {
2612 		dev_err(dev, "Failed to set intr mode based on resource "
2613 			"counts and system capabilities, aborting\n");
2614 		return err;
2615 	}
2616 
2617 	/* Allocate and configure vNIC resources
2618 	 */
2619 
2620 	err = enic_alloc_vnic_resources(enic);
2621 	if (err) {
2622 		dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2623 		goto err_out_free_vnic_resources;
2624 	}
2625 
2626 	enic_init_vnic_resources(enic);
2627 
2628 	err = enic_set_rss_nic_cfg(enic);
2629 	if (err) {
2630 		dev_err(dev, "Failed to config nic, aborting\n");
2631 		goto err_out_free_vnic_resources;
2632 	}
2633 
2634 	switch (vnic_dev_get_intr_mode(enic->vdev)) {
2635 	default:
2636 		netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2637 		break;
2638 	case VNIC_DEV_INTR_MODE_MSIX:
2639 		for (i = 0; i < enic->rq_count; i++) {
2640 			netif_napi_add(netdev, &enic->napi[i],
2641 				enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2642 		}
2643 		for (i = 0; i < enic->wq_count; i++)
2644 			netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2645 				       enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2646 		break;
2647 	}
2648 
2649 	return 0;
2650 
2651 err_out_free_vnic_resources:
2652 	enic_free_affinity_hint(enic);
2653 	enic_clear_intr_mode(enic);
2654 	enic_free_vnic_resources(enic);
2655 
2656 	return err;
2657 }
2658 
2659 static void enic_iounmap(struct enic *enic)
2660 {
2661 	unsigned int i;
2662 
2663 	for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2664 		if (enic->bar[i].vaddr)
2665 			iounmap(enic->bar[i].vaddr);
2666 }
2667 
2668 static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2669 {
2670 	struct device *dev = &pdev->dev;
2671 	struct net_device *netdev;
2672 	struct enic *enic;
2673 	int using_dac = 0;
2674 	unsigned int i;
2675 	int err;
2676 #ifdef CONFIG_PCI_IOV
2677 	int pos = 0;
2678 #endif
2679 	int num_pps = 1;
2680 
2681 	/* Allocate net device structure and initialize.  Private
2682 	 * instance data is initialized to zero.
2683 	 */
2684 
2685 	netdev = alloc_etherdev_mqs(sizeof(struct enic),
2686 				    ENIC_RQ_MAX, ENIC_WQ_MAX);
2687 	if (!netdev)
2688 		return -ENOMEM;
2689 
2690 	pci_set_drvdata(pdev, netdev);
2691 
2692 	SET_NETDEV_DEV(netdev, &pdev->dev);
2693 
2694 	enic = netdev_priv(netdev);
2695 	enic->netdev = netdev;
2696 	enic->pdev = pdev;
2697 
2698 	/* Setup PCI resources
2699 	 */
2700 
2701 	err = pci_enable_device_mem(pdev);
2702 	if (err) {
2703 		dev_err(dev, "Cannot enable PCI device, aborting\n");
2704 		goto err_out_free_netdev;
2705 	}
2706 
2707 	err = pci_request_regions(pdev, DRV_NAME);
2708 	if (err) {
2709 		dev_err(dev, "Cannot request PCI regions, aborting\n");
2710 		goto err_out_disable_device;
2711 	}
2712 
2713 	pci_set_master(pdev);
2714 
2715 	/* Query PCI controller on system for DMA addressing
2716 	 * limitation for the device.  Try 47-bit first, and
2717 	 * fail to 32-bit.
2718 	 */
2719 
2720 	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(47));
2721 	if (err) {
2722 		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
2723 		if (err) {
2724 			dev_err(dev, "No usable DMA configuration, aborting\n");
2725 			goto err_out_release_regions;
2726 		}
2727 	} else {
2728 		using_dac = 1;
2729 	}
2730 
2731 	/* Map vNIC resources from BAR0-5
2732 	 */
2733 
2734 	for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2735 		if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2736 			continue;
2737 		enic->bar[i].len = pci_resource_len(pdev, i);
2738 		enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2739 		if (!enic->bar[i].vaddr) {
2740 			dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2741 			err = -ENODEV;
2742 			goto err_out_iounmap;
2743 		}
2744 		enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2745 	}
2746 
2747 	/* Register vNIC device
2748 	 */
2749 
2750 	enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2751 		ARRAY_SIZE(enic->bar));
2752 	if (!enic->vdev) {
2753 		dev_err(dev, "vNIC registration failed, aborting\n");
2754 		err = -ENODEV;
2755 		goto err_out_iounmap;
2756 	}
2757 
2758 	err = vnic_devcmd_init(enic->vdev);
2759 
2760 	if (err)
2761 		goto err_out_vnic_unregister;
2762 
2763 #ifdef CONFIG_PCI_IOV
2764 	/* Get number of subvnics */
2765 	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2766 	if (pos) {
2767 		pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2768 			&enic->num_vfs);
2769 		if (enic->num_vfs) {
2770 			err = pci_enable_sriov(pdev, enic->num_vfs);
2771 			if (err) {
2772 				dev_err(dev, "SRIOV enable failed, aborting."
2773 					" pci_enable_sriov() returned %d\n",
2774 					err);
2775 				goto err_out_vnic_unregister;
2776 			}
2777 			enic->priv_flags |= ENIC_SRIOV_ENABLED;
2778 			num_pps = enic->num_vfs;
2779 		}
2780 	}
2781 #endif
2782 
2783 	/* Allocate structure for port profiles */
2784 	enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2785 	if (!enic->pp) {
2786 		err = -ENOMEM;
2787 		goto err_out_disable_sriov_pp;
2788 	}
2789 
2790 	/* Issue device open to get device in known state
2791 	 */
2792 
2793 	err = enic_dev_open(enic);
2794 	if (err) {
2795 		dev_err(dev, "vNIC dev open failed, aborting\n");
2796 		goto err_out_disable_sriov;
2797 	}
2798 
2799 	/* Setup devcmd lock
2800 	 */
2801 
2802 	spin_lock_init(&enic->devcmd_lock);
2803 	spin_lock_init(&enic->enic_api_lock);
2804 
2805 	/*
2806 	 * Set ingress vlan rewrite mode before vnic initialization
2807 	 */
2808 
2809 	err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2810 	if (err) {
2811 		dev_err(dev,
2812 			"Failed to set ingress vlan rewrite mode, aborting.\n");
2813 		goto err_out_dev_close;
2814 	}
2815 
2816 	/* Issue device init to initialize the vnic-to-switch link.
2817 	 * We'll start with carrier off and wait for link UP
2818 	 * notification later to turn on carrier.  We don't need
2819 	 * to wait here for the vnic-to-switch link initialization
2820 	 * to complete; link UP notification is the indication that
2821 	 * the process is complete.
2822 	 */
2823 
2824 	netif_carrier_off(netdev);
2825 
2826 	/* Do not call dev_init for a dynamic vnic.
2827 	 * For a dynamic vnic, init_prov_info will be
2828 	 * called later by an upper layer.
2829 	 */
2830 
2831 	if (!enic_is_dynamic(enic)) {
2832 		err = vnic_dev_init(enic->vdev, 0);
2833 		if (err) {
2834 			dev_err(dev, "vNIC dev init failed, aborting\n");
2835 			goto err_out_dev_close;
2836 		}
2837 	}
2838 
2839 	err = enic_dev_init(enic);
2840 	if (err) {
2841 		dev_err(dev, "Device initialization failed, aborting\n");
2842 		goto err_out_dev_close;
2843 	}
2844 
2845 	netif_set_real_num_tx_queues(netdev, enic->wq_count);
2846 	netif_set_real_num_rx_queues(netdev, enic->rq_count);
2847 
2848 	/* Setup notification timer, HW reset task, and wq locks
2849 	 */
2850 
2851 	timer_setup(&enic->notify_timer, enic_notify_timer, 0);
2852 
2853 	enic_rfs_flw_tbl_init(enic);
2854 	enic_set_rx_coal_setting(enic);
2855 	INIT_WORK(&enic->reset, enic_reset);
2856 	INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset);
2857 	INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2858 
2859 	for (i = 0; i < enic->wq_count; i++)
2860 		spin_lock_init(&enic->wq_lock[i]);
2861 
2862 	/* Register net device
2863 	 */
2864 
2865 	enic->port_mtu = enic->config.mtu;
2866 
2867 	err = enic_set_mac_addr(netdev, enic->mac_addr);
2868 	if (err) {
2869 		dev_err(dev, "Invalid MAC address, aborting\n");
2870 		goto err_out_dev_deinit;
2871 	}
2872 
2873 	enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2874 	/* rx coalesce time already got initialized. This gets used
2875 	 * if adaptive coal is turned off
2876 	 */
2877 	enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2878 
2879 	if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2880 		netdev->netdev_ops = &enic_netdev_dynamic_ops;
2881 	else
2882 		netdev->netdev_ops = &enic_netdev_ops;
2883 
2884 	netdev->watchdog_timeo = 2 * HZ;
2885 	enic_set_ethtool_ops(netdev);
2886 
2887 	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2888 	if (ENIC_SETTING(enic, LOOP)) {
2889 		netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2890 		enic->loop_enable = 1;
2891 		enic->loop_tag = enic->config.loop_tag;
2892 		dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2893 	}
2894 	if (ENIC_SETTING(enic, TXCSUM))
2895 		netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2896 	if (ENIC_SETTING(enic, TSO))
2897 		netdev->hw_features |= NETIF_F_TSO |
2898 			NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2899 	if (ENIC_SETTING(enic, RSS))
2900 		netdev->hw_features |= NETIF_F_RXHASH;
2901 	if (ENIC_SETTING(enic, RXCSUM))
2902 		netdev->hw_features |= NETIF_F_RXCSUM;
2903 	if (ENIC_SETTING(enic, VXLAN)) {
2904 		u64 patch_level;
2905 		u64 a1 = 0;
2906 
2907 		netdev->hw_enc_features |= NETIF_F_RXCSUM		|
2908 					   NETIF_F_TSO			|
2909 					   NETIF_F_TSO6			|
2910 					   NETIF_F_TSO_ECN		|
2911 					   NETIF_F_GSO_UDP_TUNNEL	|
2912 					   NETIF_F_HW_CSUM		|
2913 					   NETIF_F_GSO_UDP_TUNNEL_CSUM;
2914 		netdev->hw_features |= netdev->hw_enc_features;
2915 		/* get bit mask from hw about supported offload bit level
2916 		 * BIT(0) = fw supports patch_level 0
2917 		 *	    fcoe bit = encap
2918 		 *	    fcoe_fc_crc_ok = outer csum ok
2919 		 * BIT(1) = always set by fw
2920 		 * BIT(2) = fw supports patch_level 2
2921 		 *	    BIT(0) in rss_hash = encap
2922 		 *	    BIT(1,2) in rss_hash = outer_ip_csum_ok/
2923 		 *				   outer_tcp_csum_ok
2924 		 * used in enic_rq_indicate_buf
2925 		 */
2926 		err = vnic_dev_get_supported_feature_ver(enic->vdev,
2927 							 VIC_FEATURE_VXLAN,
2928 							 &patch_level, &a1);
2929 		if (err)
2930 			patch_level = 0;
2931 		enic->vxlan.flags = (u8)a1;
2932 		/* mask bits that are supported by driver
2933 		 */
2934 		patch_level &= BIT_ULL(0) | BIT_ULL(2);
2935 		patch_level = fls(patch_level);
2936 		patch_level = patch_level ? patch_level - 1 : 0;
2937 		enic->vxlan.patch_level = patch_level;
2938 
2939 		if (vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ) == 1 ||
2940 		    enic->vxlan.flags & ENIC_VXLAN_MULTI_WQ) {
2941 			netdev->udp_tunnel_nic_info = &enic_udp_tunnels_v4;
2942 			if (enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6)
2943 				netdev->udp_tunnel_nic_info = &enic_udp_tunnels;
2944 		}
2945 	}
2946 
2947 	netdev->features |= netdev->hw_features;
2948 	netdev->vlan_features |= netdev->features;
2949 
2950 #ifdef CONFIG_RFS_ACCEL
2951 	netdev->hw_features |= NETIF_F_NTUPLE;
2952 #endif
2953 
2954 	if (using_dac)
2955 		netdev->features |= NETIF_F_HIGHDMA;
2956 
2957 	netdev->priv_flags |= IFF_UNICAST_FLT;
2958 
2959 	/* MTU range: 68 - 9000 */
2960 	netdev->min_mtu = ENIC_MIN_MTU;
2961 	netdev->max_mtu = ENIC_MAX_MTU;
2962 	netdev->mtu	= enic->port_mtu;
2963 
2964 	err = register_netdev(netdev);
2965 	if (err) {
2966 		dev_err(dev, "Cannot register net device, aborting\n");
2967 		goto err_out_dev_deinit;
2968 	}
2969 	enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2970 
2971 	return 0;
2972 
2973 err_out_dev_deinit:
2974 	enic_dev_deinit(enic);
2975 err_out_dev_close:
2976 	vnic_dev_close(enic->vdev);
2977 err_out_disable_sriov:
2978 	kfree(enic->pp);
2979 err_out_disable_sriov_pp:
2980 #ifdef CONFIG_PCI_IOV
2981 	if (enic_sriov_enabled(enic)) {
2982 		pci_disable_sriov(pdev);
2983 		enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
2984 	}
2985 #endif
2986 err_out_vnic_unregister:
2987 	vnic_dev_unregister(enic->vdev);
2988 err_out_iounmap:
2989 	enic_iounmap(enic);
2990 err_out_release_regions:
2991 	pci_release_regions(pdev);
2992 err_out_disable_device:
2993 	pci_disable_device(pdev);
2994 err_out_free_netdev:
2995 	free_netdev(netdev);
2996 
2997 	return err;
2998 }
2999 
3000 static void enic_remove(struct pci_dev *pdev)
3001 {
3002 	struct net_device *netdev = pci_get_drvdata(pdev);
3003 
3004 	if (netdev) {
3005 		struct enic *enic = netdev_priv(netdev);
3006 
3007 		cancel_work_sync(&enic->reset);
3008 		cancel_work_sync(&enic->change_mtu_work);
3009 		unregister_netdev(netdev);
3010 		enic_dev_deinit(enic);
3011 		vnic_dev_close(enic->vdev);
3012 #ifdef CONFIG_PCI_IOV
3013 		if (enic_sriov_enabled(enic)) {
3014 			pci_disable_sriov(pdev);
3015 			enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
3016 		}
3017 #endif
3018 		kfree(enic->pp);
3019 		vnic_dev_unregister(enic->vdev);
3020 		enic_iounmap(enic);
3021 		pci_release_regions(pdev);
3022 		pci_disable_device(pdev);
3023 		free_netdev(netdev);
3024 	}
3025 }
3026 
3027 static struct pci_driver enic_driver = {
3028 	.name = DRV_NAME,
3029 	.id_table = enic_id_table,
3030 	.probe = enic_probe,
3031 	.remove = enic_remove,
3032 };
3033 
3034 module_pci_driver(enic_driver);
3035