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1 From 7f48bab7c7b468961cf70efa1d86a75173e3987a Mon Sep 17 00:00:00 2001
2 From: Mans Rullgard <mans@mansr.com>
3 Date: Thu, 26 May 2016 16:04:02 +0100
4 Subject: [PATCH] ivshmem-net: virtual network device for Jailhouse
5
6 Work in progress.
7
8 (cherry picked from commit ed818547b45e652db57d5966efe336ed646feb45)
9 ---
10 drivers/net/Kconfig | 4 +
11 drivers/net/Makefile | 2 +
12 drivers/net/ivshmem-net.c | 923 ++++++++++++++++++++++++++++++++++++++++++++++
13 3 files changed, 929 insertions(+)
14 create mode 100644 drivers/net/ivshmem-net.c
15
16 --- a/drivers/net/Kconfig
17 +++ b/drivers/net/Kconfig
18 @@ -571,4 +571,8 @@ config NET_FAILOVER
19 a VM with direct attached VF by failing over to the paravirtual
20 datapath when the VF is unplugged.
21
22 +config IVSHMEM_NET
23 + tristate "IVSHMEM virtual network device"
24 + depends on PCI
25 +
26 endif # NETDEVICES
27 --- a/drivers/net/Makefile
28 +++ b/drivers/net/Makefile
29 @@ -80,3 +80,5 @@ thunderbolt-net-y += thunderbolt.o
30 obj-$(CONFIG_THUNDERBOLT_NET) += thunderbolt-net.o
31 obj-$(CONFIG_NETDEVSIM) += netdevsim/
32 obj-$(CONFIG_NET_FAILOVER) += net_failover.o
33 +
34 +obj-$(CONFIG_IVSHMEM_NET) += ivshmem-net.o
35 --- /dev/null
36 +++ b/drivers/net/ivshmem-net.c
37 @@ -0,0 +1,923 @@
38 +/*
39 + * Copyright 2016 Mans Rullgard <mans@mansr.com>
40 + *
41 + * This program is free software; you can redistribute it and/or modify
42 + * it under the terms of the GNU General Public License as published by
43 + * the Free Software Foundation; either version 2 of the License, or
44 + * (at your option) any later version.
45 + *
46 + * This program is distributed in the hope that it will be useful,
47 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
48 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
49 + * GNU General Public License for more details.
50 + *
51 + * You should have received a copy of the GNU General Public License
52 + * along with this program; if not, see <http://www.gnu.org/licenses/>.
53 + */
54 +
55 +#include <linux/kernel.h>
56 +#include <linux/module.h>
57 +#include <linux/pci.h>
58 +#include <linux/io.h>
59 +#include <linux/bitops.h>
60 +#include <linux/interrupt.h>
61 +#include <linux/netdevice.h>
62 +#include <linux/etherdevice.h>
63 +#include <linux/rtnetlink.h>
64 +#include <linux/virtio_ring.h>
65 +
66 +#define DRV_NAME "ivshmem-net"
67 +
68 +#define JAILHOUSE_CFG_SHMEM_PTR 0x40
69 +#define JAILHOUSE_CFG_SHMEM_SZ 0x48
70 +
71 +#define IVSHM_NET_STATE_RESET 0
72 +#define IVSHM_NET_STATE_INIT 1
73 +#define IVSHM_NET_STATE_READY 2
74 +#define IVSHM_NET_STATE_RUN 3
75 +
76 +#define IVSHM_NET_MTU_MIN 256
77 +#define IVSHM_NET_MTU_MAX 65535
78 +#define IVSHM_NET_MTU_DEF 16384
79 +
80 +#define IVSHM_NET_FRAME_SIZE(s) ALIGN(18 + (s), SMP_CACHE_BYTES)
81 +
82 +#define IVSHM_NET_VQ_ALIGN 64
83 +
84 +struct ivshmem_regs {
85 + u32 imask;
86 + u32 istat;
87 + u32 ivpos;
88 + u32 doorbell;
89 + u32 lstate;
90 + u32 rstate;
91 +};
92 +
93 +struct ivshm_net_queue {
94 + struct vring vr;
95 + u32 free_head;
96 + u32 num_free;
97 + u32 num_added;
98 + u16 last_avail_idx;
99 + u16 last_used_idx;
100 +
101 + void *data;
102 + void *end;
103 + u32 size;
104 + u32 head;
105 + u32 tail;
106 +};
107 +
108 +struct ivshm_net_stats {
109 + u32 interrupts;
110 + u32 tx_packets;
111 + u32 tx_notify;
112 + u32 tx_pause;
113 + u32 rx_packets;
114 + u32 rx_notify;
115 + u32 napi_poll;
116 + u32 napi_complete;
117 + u32 napi_poll_n[10];
118 +};
119 +
120 +struct ivshm_net {
121 + struct ivshm_net_queue rx;
122 + struct ivshm_net_queue tx;
123 +
124 + u32 vrsize;
125 + u32 qlen;
126 + u32 qsize;
127 +
128 + spinlock_t tx_free_lock;
129 + spinlock_t tx_clean_lock;
130 +
131 + struct napi_struct napi;
132 +
133 + u32 lstate;
134 + u32 rstate;
135 +
136 + struct workqueue_struct *state_wq;
137 + struct work_struct state_work;
138 +
139 + struct ivshm_net_stats stats;
140 +
141 + struct ivshmem_regs __iomem *ivshm_regs;
142 + void *shm;
143 + phys_addr_t shmaddr;
144 + resource_size_t shmlen;
145 + u32 peer_id;
146 +
147 + struct pci_dev *pdev;
148 + struct msix_entry msix;
149 + bool using_msix;
150 +};
151 +
152 +static void *ivshm_net_desc_data(struct ivshm_net *in,
153 + struct ivshm_net_queue *q,
154 + struct vring_desc *desc,
155 + u32 *len)
156 +{
157 + u64 addr = READ_ONCE(desc->addr);
158 + u32 dlen = READ_ONCE(desc->len);
159 + void *data;
160 +
161 + if (addr < in->shmaddr || desc->addr > in->shmaddr + in->shmlen)
162 + return NULL;
163 +
164 + data = in->shm + (addr - in->shmaddr);
165 +
166 + if (data < q->data || data >= q->end)
167 + return NULL;
168 +
169 + if (dlen > q->end - data)
170 + return NULL;
171 +
172 + *len = dlen;
173 +
174 + return data;
175 +}
176 +
177 +static void ivshm_net_init_queue(struct ivshm_net *in,
178 + struct ivshm_net_queue *q,
179 + void *mem, unsigned int len)
180 +{
181 + memset(q, 0, sizeof(*q));
182 +
183 + vring_init(&q->vr, len, mem, IVSHM_NET_VQ_ALIGN);
184 + q->data = mem + in->vrsize;
185 + q->end = q->data + in->qsize;
186 + q->size = in->qsize;
187 +}
188 +
189 +static void ivshm_net_init_queues(struct net_device *ndev)
190 +{
191 + struct ivshm_net *in = netdev_priv(ndev);
192 + int ivpos = readl(&in->ivshm_regs->ivpos);
193 + void *tx;
194 + void *rx;
195 + int i;
196 +
197 + tx = in->shm + ivpos * in->shmlen / 2;
198 + rx = in->shm + !ivpos * in->shmlen / 2;
199 +
200 + memset(tx, 0, in->shmlen / 2);
201 +
202 + ivshm_net_init_queue(in, &in->rx, rx, in->qlen);
203 + ivshm_net_init_queue(in, &in->tx, tx, in->qlen);
204 +
205 + swap(in->rx.vr.used, in->tx.vr.used);
206 +
207 + in->tx.num_free = in->tx.vr.num;
208 +
209 + for (i = 0; i < in->tx.vr.num - 1; i++)
210 + in->tx.vr.desc[i].next = i + 1;
211 +}
212 +
213 +static int ivshm_net_calc_qsize(struct net_device *ndev)
214 +{
215 + struct ivshm_net *in = netdev_priv(ndev);
216 + unsigned int vrsize;
217 + unsigned int qsize;
218 + unsigned int qlen;
219 +
220 + for (qlen = 4096; qlen > 32; qlen >>= 1) {
221 + vrsize = vring_size(qlen, IVSHM_NET_VQ_ALIGN);
222 + vrsize = ALIGN(vrsize, IVSHM_NET_VQ_ALIGN);
223 + if (vrsize < in->shmlen / 16)
224 + break;
225 + }
226 +
227 + if (vrsize > in->shmlen / 2)
228 + return -EINVAL;
229 +
230 + qsize = in->shmlen / 2 - vrsize;
231 +
232 + if (qsize < 4 * IVSHM_NET_MTU_MIN)
233 + return -EINVAL;
234 +
235 + in->vrsize = vrsize;
236 + in->qlen = qlen;
237 + in->qsize = qsize;
238 +
239 + return 0;
240 +}
241 +
242 +static void ivshm_net_notify_tx(struct ivshm_net *in, unsigned int num)
243 +{
244 + u16 evt, old, new;
245 +
246 + virt_mb();
247 +
248 + evt = READ_ONCE(vring_avail_event(&in->tx.vr));
249 + old = in->tx.last_avail_idx - num;
250 + new = in->tx.last_avail_idx;
251 +
252 + if (vring_need_event(evt, new, old)) {
253 + writel(in->peer_id << 16, &in->ivshm_regs->doorbell);
254 + in->stats.tx_notify++;
255 + }
256 +}
257 +
258 +static void ivshm_net_enable_rx_irq(struct ivshm_net *in)
259 +{
260 + vring_avail_event(&in->rx.vr) = in->rx.last_avail_idx;
261 + virt_wmb();
262 +}
263 +
264 +static void ivshm_net_notify_rx(struct ivshm_net *in, unsigned int num)
265 +{
266 + u16 evt, old, new;
267 +
268 + virt_mb();
269 +
270 + evt = vring_used_event(&in->rx.vr);
271 + old = in->rx.last_used_idx - num;
272 + new = in->rx.last_used_idx;
273 +
274 + if (vring_need_event(evt, new, old)) {
275 + writel(in->peer_id << 16, &in->ivshm_regs->doorbell);
276 + in->stats.rx_notify++;
277 + }
278 +}
279 +
280 +static void ivshm_net_enable_tx_irq(struct ivshm_net *in)
281 +{
282 + vring_used_event(&in->tx.vr) = in->tx.last_used_idx;
283 + virt_wmb();
284 +}
285 +
286 +static bool ivshm_net_rx_avail(struct ivshm_net *in)
287 +{
288 + virt_mb();
289 + return READ_ONCE(in->rx.vr.avail->idx) != in->rx.last_avail_idx;
290 +}
291 +
292 +static size_t ivshm_net_tx_space(struct ivshm_net *in)
293 +{
294 + struct ivshm_net_queue *tx = &in->tx;
295 + u32 tail = tx->tail;
296 + u32 head = tx->head;
297 + u32 space;
298 +
299 + if (head < tail)
300 + space = tail - head;
301 + else
302 + space = max(tx->size - head, tail);
303 +
304 + return space;
305 +}
306 +
307 +static bool ivshm_net_tx_ok(struct ivshm_net *in, unsigned int mtu)
308 +{
309 + return in->tx.num_free >= 2 &&
310 + ivshm_net_tx_space(in) >= 2 * IVSHM_NET_FRAME_SIZE(mtu);
311 +}
312 +
313 +static u32 ivshm_net_tx_advance(struct ivshm_net_queue *q, u32 *pos, u32 len)
314 +{
315 + u32 p = *pos;
316 +
317 + len = IVSHM_NET_FRAME_SIZE(len);
318 +
319 + if (q->size - p < len)
320 + p = 0;
321 + *pos = p + len;
322 +
323 + return p;
324 +}
325 +
326 +static int ivshm_net_tx_frame(struct net_device *ndev, struct sk_buff *skb)
327 +{
328 + struct ivshm_net *in = netdev_priv(ndev);
329 + struct ivshm_net_queue *tx = &in->tx;
330 + struct vring *vr = &tx->vr;
331 + struct vring_desc *desc;
332 + unsigned int desc_idx;
333 + unsigned int avail;
334 + u32 head;
335 + void *buf;
336 +
337 + BUG_ON(tx->num_free < 1);
338 +
339 + spin_lock(&in->tx_free_lock);
340 + desc_idx = tx->free_head;
341 + desc = &vr->desc[desc_idx];
342 + tx->free_head = desc->next;
343 + tx->num_free--;
344 + spin_unlock(&in->tx_free_lock);
345 +
346 + head = ivshm_net_tx_advance(tx, &tx->head, skb->len);
347 +
348 + buf = tx->data + head;
349 + skb_copy_and_csum_dev(skb, buf);
350 +
351 + desc->addr = in->shmaddr + (buf - in->shm);
352 + desc->len = skb->len;
353 +
354 + avail = tx->last_avail_idx++ & (vr->num - 1);
355 + vr->avail->ring[avail] = desc_idx;
356 + tx->num_added++;
357 +
358 + if (!skb->xmit_more) {
359 + virt_store_release(&vr->avail->idx, tx->last_avail_idx);
360 + ivshm_net_notify_tx(in, tx->num_added);
361 + tx->num_added = 0;
362 + }
363 +
364 + return 0;
365 +}
366 +
367 +static void ivshm_net_tx_clean(struct net_device *ndev)
368 +{
369 + struct ivshm_net *in = netdev_priv(ndev);
370 + struct ivshm_net_queue *tx = &in->tx;
371 + struct vring *vr = &tx->vr;
372 + struct vring_desc *desc;
373 + struct vring_desc *fdesc;
374 + unsigned int used;
375 + unsigned int num;
376 + u16 used_idx;
377 + u16 last;
378 + u32 fhead;
379 +
380 + if (!spin_trylock(&in->tx_clean_lock))
381 + return;
382 +
383 + used_idx = virt_load_acquire(&vr->used->idx);
384 + last = tx->last_used_idx;
385 +
386 + fdesc = NULL;
387 + num = 0;
388 +
389 + while (last != used_idx) {
390 + void *data;
391 + u32 len;
392 + u32 tail;
393 +
394 + used = vr->used->ring[last & (vr->num - 1)].id;
395 + if (used >= vr->num) {
396 + netdev_err(ndev, "invalid tx used %d\n", used);
397 + break;
398 + }
399 +
400 + desc = &vr->desc[used];
401 +
402 + data = ivshm_net_desc_data(in, &in->tx, desc, &len);
403 + if (!data) {
404 + netdev_err(ndev, "bad tx descriptor\n");
405 + break;
406 + }
407 +
408 + tail = ivshm_net_tx_advance(tx, &tx->tail, len);
409 + if (data != tx->data + tail) {
410 + netdev_err(ndev, "bad tx descriptor\n");
411 + break;
412 + }
413 +
414 + if (!num)
415 + fdesc = desc;
416 + else
417 + desc->next = fhead;
418 +
419 + fhead = used;
420 + last++;
421 + num++;
422 + }
423 +
424 + tx->last_used_idx = last;
425 +
426 + spin_unlock(&in->tx_clean_lock);
427 +
428 + if (num) {
429 + spin_lock(&in->tx_free_lock);
430 + fdesc->next = tx->free_head;
431 + tx->free_head = fhead;
432 + tx->num_free += num;
433 + BUG_ON(tx->num_free > vr->num);
434 + spin_unlock(&in->tx_free_lock);
435 + }
436 +}
437 +
438 +static struct vring_desc *ivshm_net_rx_desc(struct net_device *ndev)
439 +{
440 + struct ivshm_net *in = netdev_priv(ndev);
441 + struct ivshm_net_queue *rx = &in->rx;
442 + struct vring *vr = &rx->vr;
443 + unsigned int avail;
444 + u16 avail_idx;
445 +
446 + avail_idx = virt_load_acquire(&vr->avail->idx);
447 +
448 + if (avail_idx == rx->last_avail_idx)
449 + return NULL;
450 +
451 + avail = vr->avail->ring[rx->last_avail_idx++ & (vr->num - 1)];
452 + if (avail >= vr->num) {
453 + netdev_err(ndev, "invalid rx avail %d\n", avail);
454 + return NULL;
455 + }
456 +
457 + return &vr->desc[avail];
458 +}
459 +
460 +static void ivshm_net_rx_finish(struct ivshm_net *in, struct vring_desc *desc)
461 +{
462 + struct ivshm_net_queue *rx = &in->rx;
463 + struct vring *vr = &rx->vr;
464 + unsigned int desc_id = desc - vr->desc;
465 + unsigned int used;
466 +
467 + used = rx->last_used_idx++ & (vr->num - 1);
468 + vr->used->ring[used].id = desc_id;
469 +
470 + virt_store_release(&vr->used->idx, rx->last_used_idx);
471 +}
472 +
473 +static int ivshm_net_poll(struct napi_struct *napi, int budget)
474 +{
475 + struct net_device *ndev = napi->dev;
476 + struct ivshm_net *in = container_of(napi, struct ivshm_net, napi);
477 + int received = 0;
478 +
479 + in->stats.napi_poll++;
480 +
481 + ivshm_net_tx_clean(ndev);
482 +
483 + while (received < budget) {
484 + struct vring_desc *desc;
485 + struct sk_buff *skb;
486 + void *data;
487 + u32 len;
488 +
489 + desc = ivshm_net_rx_desc(ndev);
490 + if (!desc)
491 + break;
492 +
493 + data = ivshm_net_desc_data(in, &in->rx, desc, &len);
494 + if (!data) {
495 + netdev_err(ndev, "bad rx descriptor\n");
496 + break;
497 + }
498 +
499 + skb = napi_alloc_skb(napi, len);
500 +
501 + if (skb) {
502 + memcpy(skb_put(skb, len), data, len);
503 + skb->protocol = eth_type_trans(skb, ndev);
504 + napi_gro_receive(napi, skb);
505 + }
506 +
507 + ndev->stats.rx_packets++;
508 + ndev->stats.rx_bytes += len;
509 +
510 + ivshm_net_rx_finish(in, desc);
511 + received++;
512 + }
513 +
514 + if (received < budget) {
515 + in->stats.napi_complete++;
516 + napi_complete_done(napi, received);
517 + ivshm_net_enable_rx_irq(in);
518 + if (ivshm_net_rx_avail(in))
519 + napi_schedule(napi);
520 + }
521 +
522 + if (received)
523 + ivshm_net_notify_rx(in, received);
524 +
525 + in->stats.rx_packets += received;
526 + in->stats.napi_poll_n[received ? 1 + min(ilog2(received), 8) : 0]++;
527 +
528 + if (ivshm_net_tx_ok(in, ndev->mtu))
529 + netif_wake_queue(ndev);
530 +
531 + return received;
532 +}
533 +
534 +static netdev_tx_t ivshm_net_xmit(struct sk_buff *skb, struct net_device *ndev)
535 +{
536 + struct ivshm_net *in = netdev_priv(ndev);
537 +
538 + ivshm_net_tx_clean(ndev);
539 +
540 + if (!ivshm_net_tx_ok(in, ndev->mtu)) {
541 + ivshm_net_enable_tx_irq(in);
542 + netif_stop_queue(ndev);
543 + skb->xmit_more = 0;
544 + in->stats.tx_pause++;
545 + }
546 +
547 + ivshm_net_tx_frame(ndev, skb);
548 +
549 + in->stats.tx_packets++;
550 + ndev->stats.tx_packets++;
551 + ndev->stats.tx_bytes += skb->len;
552 +
553 + dev_consume_skb_any(skb);
554 +
555 + return NETDEV_TX_OK;
556 +}
557 +
558 +static void ivshm_net_set_state(struct ivshm_net *in, u32 state)
559 +{
560 + virt_wmb();
561 + WRITE_ONCE(in->lstate, state);
562 + writel(state, &in->ivshm_regs->lstate);
563 +}
564 +
565 +static void ivshm_net_run(struct net_device *ndev)
566 +{
567 + struct ivshm_net *in = netdev_priv(ndev);
568 +
569 + netif_start_queue(ndev);
570 + napi_enable(&in->napi);
571 + napi_schedule(&in->napi);
572 + ivshm_net_set_state(in, IVSHM_NET_STATE_RUN);
573 +}
574 +
575 +static void ivshm_net_state_change(struct work_struct *work)
576 +{
577 + struct ivshm_net *in = container_of(work, struct ivshm_net, state_work);
578 + struct net_device *ndev = in->napi.dev;
579 + u32 rstate = readl(&in->ivshm_regs->rstate);
580 +
581 +
582 + switch (in->lstate) {
583 + case IVSHM_NET_STATE_RESET:
584 + if (rstate < IVSHM_NET_STATE_READY)
585 + ivshm_net_set_state(in, IVSHM_NET_STATE_INIT);
586 + break;
587 +
588 + case IVSHM_NET_STATE_INIT:
589 + if (rstate > IVSHM_NET_STATE_RESET) {
590 + ivshm_net_init_queues(ndev);
591 + ivshm_net_set_state(in, IVSHM_NET_STATE_READY);
592 +
593 + rtnl_lock();
594 + call_netdevice_notifiers(NETDEV_CHANGEADDR, ndev);
595 + rtnl_unlock();
596 + }
597 + break;
598 +
599 + case IVSHM_NET_STATE_READY:
600 + if (rstate >= IVSHM_NET_STATE_READY) {
601 + netif_carrier_on(ndev);
602 + if (ndev->flags & IFF_UP)
603 + ivshm_net_run(ndev);
604 + } else {
605 + netif_carrier_off(ndev);
606 + ivshm_net_set_state(in, IVSHM_NET_STATE_RESET);
607 + }
608 + break;
609 +
610 + case IVSHM_NET_STATE_RUN:
611 + if (rstate < IVSHM_NET_STATE_READY) {
612 + netif_stop_queue(ndev);
613 + napi_disable(&in->napi);
614 + netif_carrier_off(ndev);
615 + ivshm_net_set_state(in, IVSHM_NET_STATE_RESET);
616 + }
617 + break;
618 + }
619 +
620 + virt_wmb();
621 + WRITE_ONCE(in->rstate, rstate);
622 +}
623 +
624 +static bool ivshm_net_check_state(struct net_device *ndev)
625 +{
626 + struct ivshm_net *in = netdev_priv(ndev);
627 + u32 rstate = readl(&in->ivshm_regs->rstate);
628 +
629 + if (rstate != READ_ONCE(in->rstate) ||
630 + in->lstate != IVSHM_NET_STATE_RUN) {
631 + queue_work(in->state_wq, &in->state_work);
632 + return false;
633 + }
634 +
635 + return true;
636 +}
637 +
638 +static irqreturn_t ivshm_net_int(int irq, void *data)
639 +{
640 + struct net_device *ndev = data;
641 + struct ivshm_net *in = netdev_priv(ndev);
642 +
643 + in->stats.interrupts++;
644 +
645 + ivshm_net_check_state(ndev);
646 + napi_schedule_irqoff(&in->napi);
647 +
648 + return IRQ_HANDLED;
649 +}
650 +
651 +static int ivshm_net_open(struct net_device *ndev)
652 +{
653 + struct ivshm_net *in = netdev_priv(ndev);
654 +
655 + netdev_reset_queue(ndev);
656 + ndev->operstate = IF_OPER_UP;
657 +
658 + if (in->lstate == IVSHM_NET_STATE_READY)
659 + ivshm_net_run(ndev);
660 +
661 + return 0;
662 +}
663 +
664 +static int ivshm_net_stop(struct net_device *ndev)
665 +{
666 + struct ivshm_net *in = netdev_priv(ndev);
667 +
668 + ndev->operstate = IF_OPER_DOWN;
669 +
670 + if (in->lstate == IVSHM_NET_STATE_RUN) {
671 + napi_disable(&in->napi);
672 + netif_stop_queue(ndev);
673 + ivshm_net_set_state(in, IVSHM_NET_STATE_READY);
674 + }
675 +
676 + return 0;
677 +}
678 +
679 +static int ivshm_net_change_mtu(struct net_device *ndev, int mtu)
680 +{
681 + struct ivshm_net *in = netdev_priv(ndev);
682 + struct ivshm_net_queue *tx = &in->tx;
683 +
684 + if (mtu < IVSHM_NET_MTU_MIN || mtu > IVSHM_NET_MTU_MAX)
685 + return -EINVAL;
686 +
687 + if (in->tx.size / mtu < 4)
688 + return -EINVAL;
689 +
690 + if (ivshm_net_tx_space(in) < 2 * IVSHM_NET_FRAME_SIZE(mtu))
691 + return -EBUSY;
692 +
693 + if (in->tx.size - tx->head < IVSHM_NET_FRAME_SIZE(mtu) &&
694 + tx->head < tx->tail)
695 + return -EBUSY;
696 +
697 + netif_tx_lock_bh(ndev);
698 + if (in->tx.size - tx->head < IVSHM_NET_FRAME_SIZE(mtu))
699 + tx->head = 0;
700 + netif_tx_unlock_bh(ndev);
701 +
702 + ndev->mtu = mtu;
703 +
704 + return 0;
705 +}
706 +
707 +#ifdef CONFIG_NET_POLL_CONTROLLER
708 +static void ivshm_net_poll_controller(struct net_device *ndev)
709 +{
710 + struct ivshm_net *in = netdev_priv(ndev);
711 +
712 + napi_schedule(&in->napi);
713 +}
714 +#endif
715 +
716 +static const struct net_device_ops ivshm_net_ops = {
717 + .ndo_open = ivshm_net_open,
718 + .ndo_stop = ivshm_net_stop,
719 + .ndo_start_xmit = ivshm_net_xmit,
720 + .ndo_change_mtu = ivshm_net_change_mtu,
721 +#ifdef CONFIG_NET_POLL_CONTROLLER
722 + .ndo_poll_controller = ivshm_net_poll_controller,
723 +#endif
724 +};
725 +
726 +static const char ivshm_net_stats[][ETH_GSTRING_LEN] = {
727 + "interrupts",
728 + "tx_packets",
729 + "tx_notify",
730 + "tx_pause",
731 + "rx_packets",
732 + "rx_notify",
733 + "napi_poll",
734 + "napi_complete",
735 + "napi_poll_0",
736 + "napi_poll_1",
737 + "napi_poll_2",
738 + "napi_poll_4",
739 + "napi_poll_8",
740 + "napi_poll_16",
741 + "napi_poll_32",
742 + "napi_poll_64",
743 + "napi_poll_128",
744 + "napi_poll_256",
745 +};
746 +
747 +#define NUM_STATS ARRAY_SIZE(ivshm_net_stats)
748 +
749 +static int ivshm_net_get_sset_count(struct net_device *ndev, int sset)
750 +{
751 + if (sset == ETH_SS_STATS)
752 + return NUM_STATS;
753 +
754 + return -EOPNOTSUPP;
755 +}
756 +
757 +static void ivshm_net_get_strings(struct net_device *ndev, u32 sset, u8 *buf)
758 +{
759 + if (sset == ETH_SS_STATS)
760 + memcpy(buf, &ivshm_net_stats, sizeof(ivshm_net_stats));
761 +}
762 +
763 +static void ivshm_net_get_ethtool_stats(struct net_device *ndev,
764 + struct ethtool_stats *estats, u64 *st)
765 +{
766 + struct ivshm_net *in = netdev_priv(ndev);
767 + unsigned int n = 0;
768 + unsigned int i;
769 +
770 + st[n++] = in->stats.interrupts;
771 + st[n++] = in->stats.tx_packets;
772 + st[n++] = in->stats.tx_notify;
773 + st[n++] = in->stats.tx_pause;
774 + st[n++] = in->stats.rx_packets;
775 + st[n++] = in->stats.rx_notify;
776 + st[n++] = in->stats.napi_poll;
777 + st[n++] = in->stats.napi_complete;
778 +
779 + for (i = 0; i < ARRAY_SIZE(in->stats.napi_poll_n); i++)
780 + st[n++] = in->stats.napi_poll_n[i];
781 +
782 + memset(&in->stats, 0, sizeof(in->stats));
783 +}
784 +
785 +static const struct ethtool_ops ivshm_net_ethtool_ops = {
786 + .get_sset_count = ivshm_net_get_sset_count,
787 + .get_strings = ivshm_net_get_strings,
788 + .get_ethtool_stats = ivshm_net_get_ethtool_stats,
789 +};
790 +
791 +static int ivshm_net_probe(struct pci_dev *pdev,
792 + const struct pci_device_id *id)
793 +{
794 + struct net_device *ndev;
795 + struct ivshm_net *in;
796 + struct ivshmem_regs __iomem *regs;
797 + resource_size_t shmaddr;
798 + resource_size_t shmlen;
799 + int interrupt;
800 + void *shm;
801 + u32 ivpos;
802 + int err;
803 +
804 + err = pcim_enable_device(pdev);
805 + if (err) {
806 + dev_err(&pdev->dev, "pci_enable_device: %d\n", err);
807 + return err;
808 + }
809 +
810 + err = pcim_iomap_regions(pdev, BIT(0), DRV_NAME);
811 + if (err) {
812 + dev_err(&pdev->dev, "pcim_iomap_regions: %d\n", err);
813 + return err;
814 + }
815 +
816 + regs = pcim_iomap_table(pdev)[0];
817 +
818 + shmlen = pci_resource_len(pdev, 2);
819 +
820 + if (shmlen) {
821 + shmaddr = pci_resource_start(pdev, 2);
822 + } else {
823 + union { u64 v; u32 hl[2]; } val;
824 +
825 + pci_read_config_dword(pdev, JAILHOUSE_CFG_SHMEM_PTR,
826 + &val.hl[0]);
827 + pci_read_config_dword(pdev, JAILHOUSE_CFG_SHMEM_PTR + 4,
828 + &val.hl[1]);
829 + shmaddr = val.v;
830 +
831 + pci_read_config_dword(pdev, JAILHOUSE_CFG_SHMEM_SZ,
832 + &val.hl[0]);
833 + pci_read_config_dword(pdev, JAILHOUSE_CFG_SHMEM_SZ + 4,
834 + &val.hl[1]);
835 + shmlen = val.v;
836 + }
837 +
838 +
839 + if (!devm_request_mem_region(&pdev->dev, shmaddr, shmlen, DRV_NAME))
840 + return -EBUSY;
841 +
842 + shm = devm_memremap(&pdev->dev, shmaddr, shmlen, MEMREMAP_WC);
843 + if (!shm)
844 + return -ENOMEM;
845 +
846 + ivpos = readl(&regs->ivpos);
847 + if (ivpos > 1) {
848 + dev_err(&pdev->dev, "invalid IVPosition %d\n", ivpos);
849 + return -EINVAL;
850 + }
851 +
852 + dev_info(&pdev->dev, "shared memory size %pa\n", &shmlen);
853 +
854 + ndev = alloc_etherdev(sizeof(*in));
855 + if (!ndev)
856 + return -ENOMEM;
857 +
858 + pci_set_drvdata(pdev, ndev);
859 + SET_NETDEV_DEV(ndev, &pdev->dev);
860 +
861 + in = netdev_priv(ndev);
862 + in->ivshm_regs = regs;
863 + in->shm = shm;
864 + in->shmaddr = shmaddr;
865 + in->shmlen = shmlen;
866 + in->peer_id = !ivpos;
867 + in->pdev = pdev;
868 + spin_lock_init(&in->tx_free_lock);
869 + spin_lock_init(&in->tx_clean_lock);
870 +
871 + err = ivshm_net_calc_qsize(ndev);
872 + if (err)
873 + goto err_free;
874 +
875 + in->state_wq = alloc_ordered_workqueue(DRV_NAME, 0);
876 + if (!in->state_wq)
877 + goto err_free;
878 +
879 + INIT_WORK(&in->state_work, ivshm_net_state_change);
880 +
881 + eth_random_addr(ndev->dev_addr);
882 + ndev->netdev_ops = &ivshm_net_ops;
883 + ndev->ethtool_ops = &ivshm_net_ethtool_ops;
884 + ndev->mtu = min_t(u32, IVSHM_NET_MTU_DEF, in->qsize / 16);
885 + ndev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
886 + ndev->features = ndev->hw_features;
887 +
888 + netif_carrier_off(ndev);
889 + netif_napi_add(ndev, &in->napi, ivshm_net_poll, NAPI_POLL_WEIGHT);
890 +
891 + err = register_netdev(ndev);
892 + if (err)
893 + goto err_wq;
894 +
895 + err = pci_enable_msix(pdev, &in->msix, 1);
896 + if (!err) {
897 + interrupt = in->msix.vector;
898 + in->using_msix = true;
899 + } else {
900 + interrupt = pdev->irq;
901 + in->using_msix = false;
902 + }
903 +
904 + err = request_irq(interrupt, ivshm_net_int, 0, DRV_NAME, ndev);
905 + if (err)
906 + goto err_int;
907 +
908 + pci_set_master(pdev);
909 +
910 + writel(IVSHM_NET_STATE_RESET, &in->ivshm_regs->lstate);
911 +
912 + return 0;
913 +
914 +err_int:
915 + if (in->using_msix)
916 + pci_disable_msix(pdev);
917 + unregister_netdev(ndev);
918 +err_wq:
919 + destroy_workqueue(in->state_wq);
920 +err_free:
921 + free_netdev(ndev);
922 +
923 + return err;
924 +}
925 +
926 +static void ivshm_net_remove(struct pci_dev *pdev)
927 +{
928 + struct net_device *ndev = pci_get_drvdata(pdev);
929 + struct ivshm_net *in = netdev_priv(ndev);
930 +
931 + if (in->using_msix) {
932 + free_irq(in->msix.vector, ndev);
933 + pci_disable_msix(pdev);
934 + } else {
935 + free_irq(pdev->irq, ndev);
936 + }
937 +
938 + unregister_netdev(ndev);
939 + cancel_work_sync(&in->state_work);
940 + destroy_workqueue(in->state_wq);
941 + free_netdev(ndev);
942 +}
943 +
944 +static const struct pci_device_id ivshm_net_id_table[] = {
945 + { PCI_DEVICE(PCI_VENDOR_ID_REDHAT_QUMRANET, 0x1110),
946 + (PCI_CLASS_OTHERS << 16) | (0x01 << 8), 0xffff00 },
947 + { 0 }
948 +};
949 +MODULE_DEVICE_TABLE(pci, ivshm_net_id_table);
950 +
951 +static struct pci_driver ivshm_net_driver = {
952 + .name = DRV_NAME,
953 + .id_table = ivshm_net_id_table,
954 + .probe = ivshm_net_probe,
955 + .remove = ivshm_net_remove,
956 +};
957 +module_pci_driver(ivshm_net_driver);
958 +
959 +MODULE_AUTHOR("Mans Rullgard <mans@mansr.com>");
960 +MODULE_LICENSE("GPL");
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