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bnx2x: Clean the sp rtnl task upon unload
[deliverable/linux.git] / drivers / net / xen-netfront.c
CommitLineData
0d160211
JF		 1/*
2 * Virtual network driver for conversing with remote driver backends.
3 *
4 * Copyright (c) 2002-2005, K A Fraser
5 * Copyright (c) 2005, XenSource Ltd
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation; or, when distributed
10 * separately from the Linux kernel or incorporated into other
11 * software packages, subject to the following license:
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a copy
14 * of this source file (the "Software"), to deal in the Software without
15 * restriction, including without limitation the rights to use, copy, modify,
16 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
17 * and to permit persons to whom the Software is furnished to do so, subject to
18 * the following conditions:
19 *
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
29 * IN THE SOFTWARE.
30 */
31
383eda32
JP		 32#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
0d160211
JF		 34#include <linux/module.h>
35#include <linux/kernel.h>
36#include <linux/netdevice.h>
37#include <linux/etherdevice.h>
38#include <linux/skbuff.h>
39#include <linux/ethtool.h>
40#include <linux/if_ether.h>
9ecd1a75 41#include <net/tcp.h>
0d160211
JF		 42#include <linux/udp.h>
43#include <linux/moduleparam.h>
44#include <linux/mm.h>
5a0e3ad6 45#include <linux/slab.h>
0d160211
JF		 46#include <net/ip.h>
47
ca981633 48#include <asm/xen/page.h>
1ccbf534 49#include <xen/xen.h>
0d160211
JF		 50#include <xen/xenbus.h>
51#include <xen/events.h>
52#include <xen/page.h>
b9136d20 53#include <xen/platform_pci.h>
0d160211
JF		 54#include <xen/grant_table.h>
55
56#include <xen/interface/io/netif.h>
57#include <xen/interface/memory.h>
58#include <xen/interface/grant_table.h>
59
0fc0b732 60static const struct ethtool_ops xennet_ethtool_ops;
0d160211
JF		 61
62struct netfront_cb {
3683243b 63 int pull_to;
0d160211
JF		 64};
65
66#define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb))
67
68#define RX_COPY_THRESHOLD 256
69
70#define GRANT_INVALID_REF 0
71
667c78af
JF		 72#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
73#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
40206dd9 74#define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256)
0d160211 75
e00f85be 76struct netfront_stats {
77 u64 rx_packets;
78 u64 tx_packets;
79 u64 rx_bytes;
80 u64 tx_bytes;
81 struct u64_stats_sync syncp;
82};
83
0d160211
JF		 84struct netfront_info {
85 struct list_head list;
86 struct net_device *netdev;
87
bea3348e 88 struct napi_struct napi;
0d160211 89
d634bf2c
WL		 90 /* Split event channels support, tx_* == rx_* when using
91 * single event channel.
92 */
93 unsigned int tx_evtchn, rx_evtchn;
94 unsigned int tx_irq, rx_irq;
95 /* Only used when split event channels support is enabled */
96 char tx_irq_name[IFNAMSIZ+4]; /* DEVNAME-tx */
97 char rx_irq_name[IFNAMSIZ+4]; /* DEVNAME-rx */
98
84284d3c 99 struct xenbus_device *xbdev;
0d160211 100
84284d3c
JF		 101 spinlock_t tx_lock;
102 struct xen_netif_tx_front_ring tx;
103 int tx_ring_ref;
0d160211
JF		 104
105 /*
106 * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
107 * are linked from tx_skb_freelist through skb_entry.link.
108 *
109 * NB. Freelist index entries are always going to be less than
110 * PAGE_OFFSET, whereas pointers to skbs will always be equal or
111 * greater than PAGE_OFFSET: we use this property to distinguish
112 * them.
113 */
114 union skb_entry {
115 struct sk_buff *skb;
1ffb40b8 116 unsigned long link;
0d160211
JF		 117 } tx_skbs[NET_TX_RING_SIZE];
118 grant_ref_t gref_tx_head;
119 grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
120 unsigned tx_skb_freelist;
121
84284d3c
JF		 122 spinlock_t rx_lock ____cacheline_aligned_in_smp;
123 struct xen_netif_rx_front_ring rx;
124 int rx_ring_ref;
125
126 /* Receive-ring batched refills. */
127#define RX_MIN_TARGET 8
128#define RX_DFL_MIN_TARGET 64
129#define RX_MAX_TARGET min_t(int, NET_RX_RING_SIZE, 256)
130 unsigned rx_min_target, rx_max_target, rx_target;
131 struct sk_buff_head rx_batch;
132
133 struct timer_list rx_refill_timer;
134
0d160211
JF		 135 struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
136 grant_ref_t gref_rx_head;
137 grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
138
0d160211
JF		 139 unsigned long rx_pfn_array[NET_RX_RING_SIZE];
140 struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
141 struct mmu_update rx_mmu[NET_RX_RING_SIZE];
e0ce4af9
IC		 142
143 /* Statistics */
e00f85be 144 struct netfront_stats __percpu *stats;
145
e9a799ea 146 unsigned long rx_gso_checksum_fixup;
0d160211
JF		 147};
148
149struct netfront_rx_info {
150 struct xen_netif_rx_response rx;
151 struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
152};
153
1ffb40b8
IY		 154static void skb_entry_set_link(union skb_entry *list, unsigned short id)
155{
156 list->link = id;
157}
158
159static int skb_entry_is_link(const union skb_entry *list)
160{
161 BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
807540ba 162 return (unsigned long)list->skb < PAGE_OFFSET;
1ffb40b8
IY		 163}
164
0d160211
JF		 165/*
166 * Access macros for acquiring freeing slots in tx_skbs[].
167 */
168
169static void add_id_to_freelist(unsigned *head, union skb_entry *list,
170 unsigned short id)
171{
1ffb40b8 172 skb_entry_set_link(&list[id], *head);
0d160211
JF		 173 *head = id;
174}
175
176static unsigned short get_id_from_freelist(unsigned *head,
177 union skb_entry *list)
178{
179 unsigned int id = *head;
180 *head = list[id].link;
181 return id;
182}
183
184static int xennet_rxidx(RING_IDX idx)
185{
186 return idx & (NET_RX_RING_SIZE - 1);
187}
188
189static struct sk_buff *xennet_get_rx_skb(struct netfront_info *np,
190 RING_IDX ri)
191{
192 int i = xennet_rxidx(ri);
193 struct sk_buff *skb = np->rx_skbs[i];
194 np->rx_skbs[i] = NULL;
195 return skb;
196}
197
198static grant_ref_t xennet_get_rx_ref(struct netfront_info *np,
199 RING_IDX ri)
200{
201 int i = xennet_rxidx(ri);
202 grant_ref_t ref = np->grant_rx_ref[i];
203 np->grant_rx_ref[i] = GRANT_INVALID_REF;
204 return ref;
205}
206
207#ifdef CONFIG_SYSFS
208static int xennet_sysfs_addif(struct net_device *netdev);
209static void xennet_sysfs_delif(struct net_device *netdev);
210#else /* !CONFIG_SYSFS */
211#define xennet_sysfs_addif(dev) (0)
212#define xennet_sysfs_delif(dev) do { } while (0)
213#endif
214
3ad9b358 215static bool xennet_can_sg(struct net_device *dev)
0d160211 216{
3ad9b358 217 return dev->features & NETIF_F_SG;
0d160211
JF		 218}
219
220
221static void rx_refill_timeout(unsigned long data)
222{
223 struct net_device *dev = (struct net_device *)data;
bea3348e 224 struct netfront_info *np = netdev_priv(dev);
288379f0 225 napi_schedule(&np->napi);
0d160211
JF		 226}
227
228static int netfront_tx_slot_available(struct netfront_info *np)
229{
807540ba
ED		 230 return (np->tx.req_prod_pvt - np->tx.rsp_cons) <
231 (TX_MAX_TARGET - MAX_SKB_FRAGS - 2);
0d160211
JF		 232}
233
234static void xennet_maybe_wake_tx(struct net_device *dev)
235{
236 struct netfront_info *np = netdev_priv(dev);
237
238 if (unlikely(netif_queue_stopped(dev)) &&
239 netfront_tx_slot_available(np) &&
240 likely(netif_running(dev)))
241 netif_wake_queue(dev);
242}
243
244static void xennet_alloc_rx_buffers(struct net_device *dev)
245{
246 unsigned short id;
247 struct netfront_info *np = netdev_priv(dev);
248 struct sk_buff *skb;
249 struct page *page;
250 int i, batch_target, notify;
251 RING_IDX req_prod = np->rx.req_prod_pvt;
0d160211
JF		 252 grant_ref_t ref;
253 unsigned long pfn;
254 void *vaddr;
0d160211
JF		 255 struct xen_netif_rx_request *req;
256
257 if (unlikely(!netif_carrier_ok(dev)))
258 return;
259
260 /*
261 * Allocate skbuffs greedily, even though we batch updates to the
262 * receive ring. This creates a less bursty demand on the memory
263 * allocator, so should reduce the chance of failed allocation requests
264 * both for ourself and for other kernel subsystems.
265 */
266 batch_target = np->rx_target - (req_prod - np->rx.rsp_cons);
267 for (i = skb_queue_len(&np->rx_batch); i < batch_target; i++) {
617a20bb 268 skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN,
0d160211
JF		 269 GFP_ATOMIC | __GFP_NOWARN);
270 if (unlikely(!skb))
271 goto no_skb;
272
617a20bb
IY		 273 /* Align ip header to a 16 bytes boundary */
274 skb_reserve(skb, NET_IP_ALIGN);
275
0d160211
JF		 276 page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
277 if (!page) {
278 kfree_skb(skb);
279no_skb:
0d160211
JF		 280 /* Could not allocate any skbuffs. Try again later. */
281 mod_timer(&np->rx_refill_timer,
282 jiffies + (HZ/10));
fdcf7765
MJ		 283
284 /* Any skbuffs queued for refill? Force them out. */
285 if (i != 0)
286 goto refill;
0d160211
JF		 287 break;
288 }
289
093b9c71 290 skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
0d160211
JF		 291 __skb_queue_tail(&np->rx_batch, skb);
292 }
293
294 /* Is the batch large enough to be worthwhile? */
295 if (i < (np->rx_target/2)) {
296 if (req_prod > np->rx.sring->req_prod)
297 goto push;
298 return;
299 }
300
301 /* Adjust our fill target if we risked running out of buffers. */
302 if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) &&
303 ((np->rx_target *= 2) > np->rx_max_target))
304 np->rx_target = np->rx_max_target;
305
306 refill:
5dcddfae 307 for (i = 0; ; i++) {
0d160211
JF		 308 skb = __skb_dequeue(&np->rx_batch);
309 if (skb == NULL)
310 break;
311
312 skb->dev = dev;
313
314 id = xennet_rxidx(req_prod + i);
315
316 BUG_ON(np->rx_skbs[id]);
317 np->rx_skbs[id] = skb;
318
319 ref = gnttab_claim_grant_reference(&np->gref_rx_head);
320 BUG_ON((signed short)ref < 0);
321 np->grant_rx_ref[id] = ref;
322
01c68026
IC		 323 pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
324 vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0]));
0d160211
JF		 325
326 req = RING_GET_REQUEST(&np->rx, req_prod + i);
327 gnttab_grant_foreign_access_ref(ref,
328 np->xbdev->otherend_id,
329 pfn_to_mfn(pfn),
330 0);
331
332 req->id = id;
333 req->gref = ref;
334 }
335
5dcddfae 336 wmb(); /* barrier so backend seens requests */
0d160211
JF		 337
338 /* Above is a suitable barrier to ensure backend will see requests. */
339 np->rx.req_prod_pvt = req_prod + i;
340 push:
341 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
342 if (notify)
d634bf2c 343 notify_remote_via_irq(np->rx_irq);
0d160211
JF		 344}
345
346static int xennet_open(struct net_device *dev)
347{
348 struct netfront_info *np = netdev_priv(dev);
349
bea3348e
SH		 350 napi_enable(&np->napi);
351
0d160211
JF		 352 spin_lock_bh(&np->rx_lock);
353 if (netif_carrier_ok(dev)) {
354 xennet_alloc_rx_buffers(dev);
355 np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
356 if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
288379f0 357 napi_schedule(&np->napi);
0d160211
JF		 358 }
359 spin_unlock_bh(&np->rx_lock);
360
0b1ab1b8 361 netif_start_queue(dev);
0d160211
JF		 362
363 return 0;
364}
365
366static void xennet_tx_buf_gc(struct net_device *dev)
367{
368 RING_IDX cons, prod;
369 unsigned short id;
370 struct netfront_info *np = netdev_priv(dev);
371 struct sk_buff *skb;
372
373 BUG_ON(!netif_carrier_ok(dev));
374
375 do {
376 prod = np->tx.sring->rsp_prod;
377 rmb(); /* Ensure we see responses up to 'rp'. */
378
379 for (cons = np->tx.rsp_cons; cons != prod; cons++) {
380 struct xen_netif_tx_response *txrsp;
381
382 txrsp = RING_GET_RESPONSE(&np->tx, cons);
f942dc25 383 if (txrsp->status == XEN_NETIF_RSP_NULL)
0d160211
JF		 384 continue;
385
386 id = txrsp->id;
387 skb = np->tx_skbs[id].skb;
388 if (unlikely(gnttab_query_foreign_access(
389 np->grant_tx_ref[id]) != 0)) {
383eda32
JP		 390 pr_alert("%s: warning -- grant still in use by backend domain\n",
391 __func__);
0d160211
JF		 392 BUG();
393 }
394 gnttab_end_foreign_access_ref(
395 np->grant_tx_ref[id], GNTMAP_readonly);
396 gnttab_release_grant_reference(
397 &np->gref_tx_head, np->grant_tx_ref[id]);
398 np->grant_tx_ref[id] = GRANT_INVALID_REF;
399 add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id);
400 dev_kfree_skb_irq(skb);
401 }
402
403 np->tx.rsp_cons = prod;
404
405 /*
406 * Set a new event, then check for race with update of tx_cons.
407 * Note that it is essential to schedule a callback, no matter
408 * how few buffers are pending. Even if there is space in the
409 * transmit ring, higher layers may be blocked because too much
410 * data is outstanding: in such cases notification from Xen is
411 * likely to be the only kick that we'll get.
412 */
413 np->tx.sring->rsp_event =
414 prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
415 mb(); /* update shared area */
416 } while ((cons == prod) && (prod != np->tx.sring->rsp_prod));
417
418 xennet_maybe_wake_tx(dev);
419}
420
421static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
422 struct xen_netif_tx_request *tx)
423{
424 struct netfront_info *np = netdev_priv(dev);
425 char *data = skb->data;
426 unsigned long mfn;
427 RING_IDX prod = np->tx.req_prod_pvt;
428 int frags = skb_shinfo(skb)->nr_frags;
429 unsigned int offset = offset_in_page(data);
430 unsigned int len = skb_headlen(skb);
431 unsigned int id;
432 grant_ref_t ref;
433 int i;
434
435 /* While the header overlaps a page boundary (including being
436 larger than a page), split it it into page-sized chunks. */
437 while (len > PAGE_SIZE - offset) {
438 tx->size = PAGE_SIZE - offset;
f942dc25 439 tx->flags |= XEN_NETTXF_more_data;
0d160211
JF		 440 len -= tx->size;
441 data += tx->size;
442 offset = 0;
443
444 id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
445 np->tx_skbs[id].skb = skb_get(skb);
446 tx = RING_GET_REQUEST(&np->tx, prod++);
447 tx->id = id;
448 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
449 BUG_ON((signed short)ref < 0);
450
451 mfn = virt_to_mfn(data);
452 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
453 mfn, GNTMAP_readonly);
454
455 tx->gref = np->grant_tx_ref[id] = ref;
456 tx->offset = offset;
457 tx->size = len;
458 tx->flags = 0;
459 }
460
461 /* Grant backend access to each skb fragment page. */
462 for (i = 0; i < frags; i++) {
463 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
f36c3747 464 struct page *page = skb_frag_page(frag);
0d160211 465
f36c3747
IC		 466 len = skb_frag_size(frag);
467 offset = frag->page_offset;
0d160211 468
f36c3747
IC		 469 /* Data must not cross a page boundary. */
470 BUG_ON(len + offset > PAGE_SIZE<<compound_order(page));
0d160211 471
f36c3747
IC		 472 /* Skip unused frames from start of page */
473 page += offset >> PAGE_SHIFT;
474 offset &= ~PAGE_MASK;
0d160211 475
f36c3747
IC		 476 while (len > 0) {
477 unsigned long bytes;
478
479 BUG_ON(offset >= PAGE_SIZE);
480
481 bytes = PAGE_SIZE - offset;
482 if (bytes > len)
483 bytes = len;
484
485 tx->flags |= XEN_NETTXF_more_data;
486
487 id = get_id_from_freelist(&np->tx_skb_freelist,
488 np->tx_skbs);
489 np->tx_skbs[id].skb = skb_get(skb);
490 tx = RING_GET_REQUEST(&np->tx, prod++);
491 tx->id = id;
492 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
493 BUG_ON((signed short)ref < 0);
494
495 mfn = pfn_to_mfn(page_to_pfn(page));
496 gnttab_grant_foreign_access_ref(ref,
497 np->xbdev->otherend_id,
498 mfn, GNTMAP_readonly);
499
500 tx->gref = np->grant_tx_ref[id] = ref;
501 tx->offset = offset;
502 tx->size = bytes;
503 tx->flags = 0;
504
505 offset += bytes;
506 len -= bytes;
507
508 /* Next frame */
509 if (offset == PAGE_SIZE && len) {
510 BUG_ON(!PageCompound(page));
511 page++;
512 offset = 0;
513 }
514 }
0d160211
JF		 515 }
516
517 np->tx.req_prod_pvt = prod;
518}
519
f36c3747
IC		 520/*
521 * Count how many ring slots are required to send the frags of this
522 * skb. Each frag might be a compound page.
523 */
524static int xennet_count_skb_frag_slots(struct sk_buff *skb)
525{
526 int i, frags = skb_shinfo(skb)->nr_frags;
527 int pages = 0;
528
529 for (i = 0; i < frags; i++) {
530 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
531 unsigned long size = skb_frag_size(frag);
532 unsigned long offset = frag->page_offset;
533
534 /* Skip unused frames from start of page */
535 offset &= ~PAGE_MASK;
536
537 pages += PFN_UP(offset + size);
538 }
539
540 return pages;
541}
542
0d160211
JF		 543static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
544{
545 unsigned short id;
546 struct netfront_info *np = netdev_priv(dev);
e00f85be 547 struct netfront_stats *stats = this_cpu_ptr(np->stats);
0d160211 548 struct xen_netif_tx_request *tx;
0d160211
JF		 549 char *data = skb->data;
550 RING_IDX i;
551 grant_ref_t ref;
552 unsigned long mfn;
553 int notify;
f36c3747 554 int slots;
0d160211
JF		 555 unsigned int offset = offset_in_page(data);
556 unsigned int len = skb_headlen(skb);
cf66f9d4 557 unsigned long flags;
0d160211 558
9ecd1a75
WL		 559 /* If skb->len is too big for wire format, drop skb and alert
560 * user about misconfiguration.
561 */
562 if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
563 net_alert_ratelimited(
564 "xennet: skb->len = %u, too big for wire format\n",
565 skb->len);
566 goto drop;
567 }
568
f36c3747
IC		 569 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) +
570 xennet_count_skb_frag_slots(skb);
571 if (unlikely(slots > MAX_SKB_FRAGS + 1)) {
572 net_alert_ratelimited(
573 "xennet: skb rides the rocket: %d slots\n", slots);
0d160211
JF		 574 goto drop;
575 }
576
cf66f9d4 577 spin_lock_irqsave(&np->tx_lock, flags);
0d160211
JF		 578
579 if (unlikely(!netif_carrier_ok(dev) ||
f36c3747 580 (slots > 1 && !xennet_can_sg(dev)) ||
fc741216 581 netif_needs_gso(skb, netif_skb_features(skb)))) {
cf66f9d4 582 spin_unlock_irqrestore(&np->tx_lock, flags);
0d160211
JF		 583 goto drop;
584 }
585
586 i = np->tx.req_prod_pvt;
587
588 id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
589 np->tx_skbs[id].skb = skb;
590
591 tx = RING_GET_REQUEST(&np->tx, i);
592
593 tx->id = id;
594 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
595 BUG_ON((signed short)ref < 0);
596 mfn = virt_to_mfn(data);
597 gnttab_grant_foreign_access_ref(
598 ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly);
599 tx->gref = np->grant_tx_ref[id] = ref;
600 tx->offset = offset;
601 tx->size = len;
0d160211
JF		 602
603 tx->flags = 0;
604 if (skb->ip_summed == CHECKSUM_PARTIAL)
605 /* local packet? */
f942dc25 606 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
0d160211
JF		 607 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
608 /* remote but checksummed. */
f942dc25 609 tx->flags |= XEN_NETTXF_data_validated;
0d160211
JF		 610
611 if (skb_shinfo(skb)->gso_size) {
612 struct xen_netif_extra_info *gso;
613
614 gso = (struct xen_netif_extra_info *)
615 RING_GET_REQUEST(&np->tx, ++i);
616
e2d617c0 617 tx->flags |= XEN_NETTXF_extra_info;
0d160211
JF		 618
619 gso->u.gso.size = skb_shinfo(skb)->gso_size;
620 gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4;
621 gso->u.gso.pad = 0;
622 gso->u.gso.features = 0;
623
624 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
625 gso->flags = 0;
0d160211
JF		 626 }
627
628 np->tx.req_prod_pvt = i + 1;
629
630 xennet_make_frags(skb, dev, tx);
631 tx->size = skb->len;
632
633 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
634 if (notify)
d634bf2c 635 notify_remote_via_irq(np->tx_irq);
0d160211 636
e00f85be 637 u64_stats_update_begin(&stats->syncp);
638 stats->tx_bytes += skb->len;
639 stats->tx_packets++;
640 u64_stats_update_end(&stats->syncp);
10a273a6
JF		 641
642 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
0d160211
JF		 643 xennet_tx_buf_gc(dev);
644
645 if (!netfront_tx_slot_available(np))
646 netif_stop_queue(dev);
647
cf66f9d4 648 spin_unlock_irqrestore(&np->tx_lock, flags);
0d160211 649
6ed10654 650 return NETDEV_TX_OK;
0d160211
JF		 651
652 drop:
09f75cd7 653 dev->stats.tx_dropped++;
0d160211 654 dev_kfree_skb(skb);
6ed10654 655 return NETDEV_TX_OK;
0d160211
JF		 656}
657
658static int xennet_close(struct net_device *dev)
659{
660 struct netfront_info *np = netdev_priv(dev);
661 netif_stop_queue(np->netdev);
bea3348e 662 napi_disable(&np->napi);
0d160211
JF		 663 return 0;
664}
665
0d160211
JF		 666static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb,
667 grant_ref_t ref)
668{
669 int new = xennet_rxidx(np->rx.req_prod_pvt);
670
671 BUG_ON(np->rx_skbs[new]);
672 np->rx_skbs[new] = skb;
673 np->grant_rx_ref[new] = ref;
674 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
675 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
676 np->rx.req_prod_pvt++;
677}
678
679static int xennet_get_extras(struct netfront_info *np,
680 struct xen_netif_extra_info *extras,
681 RING_IDX rp)
682
683{
684 struct xen_netif_extra_info *extra;
685 struct device *dev = &np->netdev->dev;
686 RING_IDX cons = np->rx.rsp_cons;
687 int err = 0;
688
689 do {
690 struct sk_buff *skb;
691 grant_ref_t ref;
692
693 if (unlikely(cons + 1 == rp)) {
694 if (net_ratelimit())
695 dev_warn(dev, "Missing extra info\n");
696 err = -EBADR;
697 break;
698 }
699
700 extra = (struct xen_netif_extra_info *)
701 RING_GET_RESPONSE(&np->rx, ++cons);
702
703 if (unlikely(!extra->type ||
704 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
705 if (net_ratelimit())
706 dev_warn(dev, "Invalid extra type: %d\n",
707 extra->type);
708 err = -EINVAL;
709 } else {
710 memcpy(&extras[extra->type - 1], extra,
711 sizeof(*extra));
712 }
713
714 skb = xennet_get_rx_skb(np, cons);
715 ref = xennet_get_rx_ref(np, cons);
716 xennet_move_rx_slot(np, skb, ref);
717 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
718
719 np->rx.rsp_cons = cons;
720 return err;
721}
722
723static int xennet_get_responses(struct netfront_info *np,
724 struct netfront_rx_info *rinfo, RING_IDX rp,
725 struct sk_buff_head *list)
726{
727 struct xen_netif_rx_response *rx = &rinfo->rx;
728 struct xen_netif_extra_info *extras = rinfo->extras;
729 struct device *dev = &np->netdev->dev;
730 RING_IDX cons = np->rx.rsp_cons;
731 struct sk_buff *skb = xennet_get_rx_skb(np, cons);
732 grant_ref_t ref = xennet_get_rx_ref(np, cons);
733 int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
7158ff6d 734 int slots = 1;
0d160211
JF		 735 int err = 0;
736 unsigned long ret;
737
f942dc25 738 if (rx->flags & XEN_NETRXF_extra_info) {
0d160211
JF		 739 err = xennet_get_extras(np, extras, rp);
740 cons = np->rx.rsp_cons;
741 }
742
743 for (;;) {
744 if (unlikely(rx->status < 0 ||
745 rx->offset + rx->status > PAGE_SIZE)) {
746 if (net_ratelimit())
747 dev_warn(dev, "rx->offset: %x, size: %u\n",
748 rx->offset, rx->status);
749 xennet_move_rx_slot(np, skb, ref);
750 err = -EINVAL;
751 goto next;
752 }
753
754 /*
755 * This definitely indicates a bug, either in this driver or in
756 * the backend driver. In future this should flag the bad
697089dc 757 * situation to the system controller to reboot the backend.
0d160211
JF		 758 */
759 if (ref == GRANT_INVALID_REF) {
760 if (net_ratelimit())
761 dev_warn(dev, "Bad rx response id %d.\n",
762 rx->id);
763 err = -EINVAL;
764 goto next;
765 }
766
767 ret = gnttab_end_foreign_access_ref(ref, 0);
768 BUG_ON(!ret);
769
770 gnttab_release_grant_reference(&np->gref_rx_head, ref);
771
772 __skb_queue_tail(list, skb);
773
774next:
f942dc25 775 if (!(rx->flags & XEN_NETRXF_more_data))
0d160211
JF		 776 break;
777
7158ff6d 778 if (cons + slots == rp) {
0d160211 779 if (net_ratelimit())
7158ff6d 780 dev_warn(dev, "Need more slots\n");
0d160211
JF		 781 err = -ENOENT;
782 break;
783 }
784
7158ff6d
WL		 785 rx = RING_GET_RESPONSE(&np->rx, cons + slots);
786 skb = xennet_get_rx_skb(np, cons + slots);
787 ref = xennet_get_rx_ref(np, cons + slots);
788 slots++;
0d160211
JF		 789 }
790
7158ff6d 791 if (unlikely(slots > max)) {
0d160211 792 if (net_ratelimit())
697089dc 793 dev_warn(dev, "Too many slots\n");
0d160211
JF		 794 err = -E2BIG;
795 }
796
797 if (unlikely(err))
7158ff6d 798 np->rx.rsp_cons = cons + slots;
0d160211
JF		 799
800 return err;
801}
802
803static int xennet_set_skb_gso(struct sk_buff *skb,
804 struct xen_netif_extra_info *gso)
805{
806 if (!gso->u.gso.size) {
807 if (net_ratelimit())
383eda32 808 pr_warn("GSO size must not be zero\n");
0d160211
JF		 809 return -EINVAL;
810 }
811
812 /* Currently only TCPv4 S.O. is supported. */
813 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
814 if (net_ratelimit())
383eda32 815 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
0d160211
JF		 816 return -EINVAL;
817 }
818
819 skb_shinfo(skb)->gso_size = gso->u.gso.size;
820 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
821
822 /* Header must be checked, and gso_segs computed. */
823 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
824 skb_shinfo(skb)->gso_segs = 0;
825
826 return 0;
827}
828
829static RING_IDX xennet_fill_frags(struct netfront_info *np,
830 struct sk_buff *skb,
831 struct sk_buff_head *list)
832{
833 struct skb_shared_info *shinfo = skb_shinfo(skb);
0d160211 834 RING_IDX cons = np->rx.rsp_cons;
0d160211
JF		 835 struct sk_buff *nskb;
836
837 while ((nskb = __skb_dequeue(list))) {
838 struct xen_netif_rx_response *rx =
839 RING_GET_RESPONSE(&np->rx, ++cons);
01c68026 840 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
0d160211 841
093b9c71
JB		 842 if (shinfo->nr_frags == MAX_SKB_FRAGS) {
843 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
0d160211 844
093b9c71
JB		 845 BUG_ON(pull_to <= skb_headlen(skb));
846 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
847 }
848 BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
849
850 skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
851 rx->offset, rx->status, PAGE_SIZE);
0d160211
JF		 852
853 skb_shinfo(nskb)->nr_frags = 0;
854 kfree_skb(nskb);
0d160211
JF		 855 }
856
0d160211
JF		 857 return cons;
858}
859
e0ce4af9 860static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
0d160211
JF		 861{
862 struct iphdr *iph;
0d160211 863 int err = -EPROTO;
e0ce4af9
IC		 864 int recalculate_partial_csum = 0;
865
866 /*
867 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
868 * peers can fail to set NETRXF_csum_blank when sending a GSO
869 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
870 * recalculate the partial checksum.
871 */
872 if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
873 struct netfront_info *np = netdev_priv(dev);
874 np->rx_gso_checksum_fixup++;
875 skb->ip_summed = CHECKSUM_PARTIAL;
876 recalculate_partial_csum = 1;
877 }
878
879 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
880 if (skb->ip_summed != CHECKSUM_PARTIAL)
881 return 0;
0d160211
JF		 882
883 if (skb->protocol != htons(ETH_P_IP))
884 goto out;
885
886 iph = (void *)skb->data;
0d160211 887
0d160211
JF		 888 switch (iph->protocol) {
889 case IPPROTO_TCP:
8249152c
LR		 890 if (!skb_partial_csum_set(skb, 4 * iph->ihl,
891 offsetof(struct tcphdr, check)))
892 goto out;
e0ce4af9
IC		 893
894 if (recalculate_partial_csum) {
8249152c 895 struct tcphdr *tcph = tcp_hdr(skb);
e0ce4af9
IC		 896 tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
897 skb->len - iph->ihl*4,
898 IPPROTO_TCP, 0);
899 }
0d160211
JF		 900 break;
901 case IPPROTO_UDP:
8249152c
LR		 902 if (!skb_partial_csum_set(skb, 4 * iph->ihl,
903 offsetof(struct udphdr, check)))
904 goto out;
e0ce4af9
IC		 905
906 if (recalculate_partial_csum) {
8249152c 907 struct udphdr *udph = udp_hdr(skb);
e0ce4af9
IC		 908 udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
909 skb->len - iph->ihl*4,
910 IPPROTO_UDP, 0);
911 }
0d160211
JF		 912 break;
913 default:
914 if (net_ratelimit())
383eda32
JP		 915 pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n",
916 iph->protocol);
0d160211
JF		 917 goto out;
918 }
919
0d160211
JF		 920 err = 0;
921
922out:
923 return err;
924}
925
926static int handle_incoming_queue(struct net_device *dev,
09f75cd7 927 struct sk_buff_head *rxq)
0d160211 928{
e00f85be 929 struct netfront_info *np = netdev_priv(dev);
930 struct netfront_stats *stats = this_cpu_ptr(np->stats);
0d160211
JF		 931 int packets_dropped = 0;
932 struct sk_buff *skb;
933
934 while ((skb = __skb_dequeue(rxq)) != NULL) {
3683243b 935 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
0d160211 936
093b9c71
JB		 937 if (pull_to > skb_headlen(skb))
938 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
0d160211
JF		 939
940 /* Ethernet work: Delayed to here as it peeks the header. */
941 skb->protocol = eth_type_trans(skb, dev);
942
e0ce4af9
IC		 943 if (checksum_setup(dev, skb)) {
944 kfree_skb(skb);
945 packets_dropped++;
946 dev->stats.rx_errors++;
947 continue;
0d160211
JF		 948 }
949
e00f85be 950 u64_stats_update_begin(&stats->syncp);
951 stats->rx_packets++;
952 stats->rx_bytes += skb->len;
953 u64_stats_update_end(&stats->syncp);
0d160211
JF		 954
955 /* Pass it up. */
99d3d587 956 napi_gro_receive(&np->napi, skb);
0d160211
JF		 957 }
958
959 return packets_dropped;
960}
961
bea3348e 962static int xennet_poll(struct napi_struct *napi, int budget)
0d160211 963{
bea3348e
SH		 964 struct netfront_info *np = container_of(napi, struct netfront_info, napi);
965 struct net_device *dev = np->netdev;
0d160211
JF		 966 struct sk_buff *skb;
967 struct netfront_rx_info rinfo;
968 struct xen_netif_rx_response *rx = &rinfo.rx;
969 struct xen_netif_extra_info *extras = rinfo.extras;
970 RING_IDX i, rp;
bea3348e 971 int work_done;
0d160211
JF		 972 struct sk_buff_head rxq;
973 struct sk_buff_head errq;
974 struct sk_buff_head tmpq;
975 unsigned long flags;
0d160211
JF		 976 int err;
977
978 spin_lock(&np->rx_lock);
979
0d160211
JF		 980 skb_queue_head_init(&rxq);
981 skb_queue_head_init(&errq);
982 skb_queue_head_init(&tmpq);
983
0d160211
JF		 984 rp = np->rx.sring->rsp_prod;
985 rmb(); /* Ensure we see queued responses up to 'rp'. */
986
987 i = np->rx.rsp_cons;
988 work_done = 0;
989 while ((i != rp) && (work_done < budget)) {
990 memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
991 memset(extras, 0, sizeof(rinfo.extras));
992
993 err = xennet_get_responses(np, &rinfo, rp, &tmpq);
994
995 if (unlikely(err)) {
996err:
997 while ((skb = __skb_dequeue(&tmpq)))
998 __skb_queue_tail(&errq, skb);
09f75cd7 999 dev->stats.rx_errors++;
0d160211
JF		 1000 i = np->rx.rsp_cons;
1001 continue;
1002 }
1003
1004 skb = __skb_dequeue(&tmpq);
1005
1006 if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
1007 struct xen_netif_extra_info *gso;
1008 gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
1009
1010 if (unlikely(xennet_set_skb_gso(skb, gso))) {
1011 __skb_queue_head(&tmpq, skb);
1012 np->rx.rsp_cons += skb_queue_len(&tmpq);
1013 goto err;
1014 }
1015 }
1016
3683243b
IC		 1017 NETFRONT_SKB_CB(skb)->pull_to = rx->status;
1018 if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
1019 NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
0d160211 1020
3683243b
IC		 1021 skb_shinfo(skb)->frags[0].page_offset = rx->offset;
1022 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1023 skb->data_len = rx->status;
093b9c71 1024 skb->len += rx->status;
0d160211
JF		 1025
1026 i = xennet_fill_frags(np, skb, &tmpq);
1027
f942dc25 1028 if (rx->flags & XEN_NETRXF_csum_blank)
0d160211 1029 skb->ip_summed = CHECKSUM_PARTIAL;
f942dc25 1030 else if (rx->flags & XEN_NETRXF_data_validated)
0d160211
JF		 1031 skb->ip_summed = CHECKSUM_UNNECESSARY;
1032
1033 __skb_queue_tail(&rxq, skb);
1034
1035 np->rx.rsp_cons = ++i;
1036 work_done++;
1037 }
1038
56cfe5d0 1039 __skb_queue_purge(&errq);
0d160211
JF		 1040
1041 work_done -= handle_incoming_queue(dev, &rxq);
1042
1043 /* If we get a callback with very few responses, reduce fill target. */
1044 /* NB. Note exponential increase, linear decrease. */
1045 if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
1046 ((3*np->rx_target) / 4)) &&
1047 (--np->rx_target < np->rx_min_target))
1048 np->rx_target = np->rx_min_target;
1049
1050 xennet_alloc_rx_buffers(dev);
1051
0d160211 1052 if (work_done < budget) {
bea3348e
SH		 1053 int more_to_do = 0;
1054
99d3d587
WL		 1055 napi_gro_flush(napi, false);
1056
0d160211
JF		 1057 local_irq_save(flags);
1058
1059 RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do);
1060 if (!more_to_do)
288379f0 1061 __napi_complete(napi);
0d160211
JF		 1062
1063 local_irq_restore(flags);
1064 }
1065
1066 spin_unlock(&np->rx_lock);
1067
bea3348e 1068 return work_done;
0d160211
JF		 1069}
1070
1071static int xennet_change_mtu(struct net_device *dev, int mtu)
1072{
9ecd1a75
WL		 1073 int max = xennet_can_sg(dev) ?
1074 XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN;
0d160211
JF		 1075
1076 if (mtu > max)
1077 return -EINVAL;
1078 dev->mtu = mtu;
1079 return 0;
1080}
1081
e00f85be 1082static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
1083 struct rtnl_link_stats64 *tot)
1084{
1085 struct netfront_info *np = netdev_priv(dev);
1086 int cpu;
1087
1088 for_each_possible_cpu(cpu) {
1089 struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu);
1090 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1091 unsigned int start;
1092
1093 do {
1094 start = u64_stats_fetch_begin_bh(&stats->syncp);
1095
1096 rx_packets = stats->rx_packets;
1097 tx_packets = stats->tx_packets;
1098 rx_bytes = stats->rx_bytes;
1099 tx_bytes = stats->tx_bytes;
1100 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
1101
1102 tot->rx_packets += rx_packets;
1103 tot->tx_packets += tx_packets;
1104 tot->rx_bytes += rx_bytes;
1105 tot->tx_bytes += tx_bytes;
1106 }
1107
1108 tot->rx_errors = dev->stats.rx_errors;
1109 tot->tx_dropped = dev->stats.tx_dropped;
1110
1111 return tot;
1112}
1113
0d160211
JF		 1114static void xennet_release_tx_bufs(struct netfront_info *np)
1115{
1116 struct sk_buff *skb;
1117 int i;
1118
1119 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1120 /* Skip over entries which are actually freelist references */
1ffb40b8 1121 if (skb_entry_is_link(&np->tx_skbs[i]))
0d160211
JF		 1122 continue;
1123
1124 skb = np->tx_skbs[i].skb;
1125 gnttab_end_foreign_access_ref(np->grant_tx_ref[i],
1126 GNTMAP_readonly);
1127 gnttab_release_grant_reference(&np->gref_tx_head,
1128 np->grant_tx_ref[i]);
1129 np->grant_tx_ref[i] = GRANT_INVALID_REF;
1130 add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i);
1131 dev_kfree_skb_irq(skb);
1132 }
1133}
1134
1135static void xennet_release_rx_bufs(struct netfront_info *np)
1136{
1137 struct mmu_update *mmu = np->rx_mmu;
1138 struct multicall_entry *mcl = np->rx_mcl;
1139 struct sk_buff_head free_list;
1140 struct sk_buff *skb;
1141 unsigned long mfn;
1142 int xfer = 0, noxfer = 0, unused = 0;
1143 int id, ref;
1144
1145 dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n",
1146 __func__);
1147 return;
1148
1149 skb_queue_head_init(&free_list);
1150
1151 spin_lock_bh(&np->rx_lock);
1152
1153 for (id = 0; id < NET_RX_RING_SIZE; id++) {
1154 ref = np->grant_rx_ref[id];
1155 if (ref == GRANT_INVALID_REF) {
1156 unused++;
1157 continue;
1158 }
1159
1160 skb = np->rx_skbs[id];
1161 mfn = gnttab_end_foreign_transfer_ref(ref);
1162 gnttab_release_grant_reference(&np->gref_rx_head, ref);
1163 np->grant_rx_ref[id] = GRANT_INVALID_REF;
1164
1165 if (0 == mfn) {
1166 skb_shinfo(skb)->nr_frags = 0;
1167 dev_kfree_skb(skb);
1168 noxfer++;
1169 continue;
1170 }
1171
1172 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
1173 /* Remap the page. */
01c68026
IC		 1174 const struct page *page =
1175 skb_frag_page(&skb_shinfo(skb)->frags[0]);
0d160211
JF		 1176 unsigned long pfn = page_to_pfn(page);
1177 void *vaddr = page_address(page);
1178
1179 MULTI_update_va_mapping(mcl, (unsigned long)vaddr,
1180 mfn_pte(mfn, PAGE_KERNEL),
1181 0);
1182 mcl++;
1183 mmu->ptr = ((u64)mfn << PAGE_SHIFT)
1184 | MMU_MACHPHYS_UPDATE;
1185 mmu->val = pfn;
1186 mmu++;
1187
1188 set_phys_to_machine(pfn, mfn);
1189 }
1190 __skb_queue_tail(&free_list, skb);
1191 xfer++;
1192 }
1193
1194 dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n",
1195 __func__, xfer, noxfer, unused);
1196
1197 if (xfer) {
1198 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
1199 /* Do all the remapping work and M2P updates. */
1200 MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu,
79ea13ce 1201 NULL, DOMID_SELF);
0d160211
JF		 1202 mcl++;
1203 HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl);
1204 }
1205 }
1206
56cfe5d0 1207 __skb_queue_purge(&free_list);
0d160211
JF		 1208
1209 spin_unlock_bh(&np->rx_lock);
1210}
1211
1212static void xennet_uninit(struct net_device *dev)
1213{
1214 struct netfront_info *np = netdev_priv(dev);
1215 xennet_release_tx_bufs(np);
1216 xennet_release_rx_bufs(np);
1217 gnttab_free_grant_references(np->gref_tx_head);
1218 gnttab_free_grant_references(np->gref_rx_head);
1219}
1220
c8f44aff
MM		 1221static netdev_features_t xennet_fix_features(struct net_device *dev,
1222 netdev_features_t features)
8f7b01a1
ED		 1223{
1224 struct netfront_info *np = netdev_priv(dev);
1225 int val;
1226
1227 if (features & NETIF_F_SG) {
1228 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
1229 "%d", &val) < 0)
1230 val = 0;
1231
1232 if (!val)
1233 features &= ~NETIF_F_SG;
1234 }
1235
1236 if (features & NETIF_F_TSO) {
1237 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1238 "feature-gso-tcpv4", "%d", &val) < 0)
1239 val = 0;
1240
1241 if (!val)
1242 features &= ~NETIF_F_TSO;
1243 }
1244
1245 return features;
1246}
1247
c8f44aff
MM		 1248static int xennet_set_features(struct net_device *dev,
1249 netdev_features_t features)
8f7b01a1
ED		 1250{
1251 if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
1252 netdev_info(dev, "Reducing MTU because no SG offload");
1253 dev->mtu = ETH_DATA_LEN;
1254 }
1255
1256 return 0;
1257}
1258
d634bf2c 1259static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
cf66f9d4 1260{
d634bf2c
WL		 1261 struct netfront_info *np = dev_id;
1262 struct net_device *dev = np->netdev;
cf66f9d4
KRW		 1263 unsigned long flags;
1264
1265 spin_lock_irqsave(&np->tx_lock, flags);
d634bf2c
WL		 1266 xennet_tx_buf_gc(dev);
1267 spin_unlock_irqrestore(&np->tx_lock, flags);
cf66f9d4 1268
d634bf2c
WL		 1269 return IRQ_HANDLED;
1270}
1271
1272static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1273{
1274 struct netfront_info *np = dev_id;
1275 struct net_device *dev = np->netdev;
1276
1277 if (likely(netif_carrier_ok(dev) &&
1278 RING_HAS_UNCONSUMED_RESPONSES(&np->rx)))
cf66f9d4 1279 napi_schedule(&np->napi);
cf66f9d4 1280
d634bf2c
WL		 1281 return IRQ_HANDLED;
1282}
cf66f9d4 1283
d634bf2c
WL		 1284static irqreturn_t xennet_interrupt(int irq, void *dev_id)
1285{
1286 xennet_tx_interrupt(irq, dev_id);
1287 xennet_rx_interrupt(irq, dev_id);
cf66f9d4
KRW		 1288 return IRQ_HANDLED;
1289}
1290
1291#ifdef CONFIG_NET_POLL_CONTROLLER
1292static void xennet_poll_controller(struct net_device *dev)
1293{
1294 xennet_interrupt(0, dev);
1295}
1296#endif
1297
0a0b9d2e
SH		 1298static const struct net_device_ops xennet_netdev_ops = {
1299 .ndo_open = xennet_open,
1300 .ndo_uninit = xennet_uninit,
1301 .ndo_stop = xennet_close,
1302 .ndo_start_xmit = xennet_start_xmit,
1303 .ndo_change_mtu = xennet_change_mtu,
e00f85be 1304 .ndo_get_stats64 = xennet_get_stats64,
0a0b9d2e
SH		 1305 .ndo_set_mac_address = eth_mac_addr,
1306 .ndo_validate_addr = eth_validate_addr,
fb507934
MM		 1307 .ndo_fix_features = xennet_fix_features,
1308 .ndo_set_features = xennet_set_features,
cf66f9d4
KRW		 1309#ifdef CONFIG_NET_POLL_CONTROLLER
1310 .ndo_poll_controller = xennet_poll_controller,
1311#endif
0a0b9d2e
SH		 1312};
1313
8e0e46bb 1314static struct net_device *xennet_create_dev(struct xenbus_device *dev)
0d160211
JF		 1315{
1316 int i, err;
1317 struct net_device *netdev;
1318 struct netfront_info *np;
1319
1320 netdev = alloc_etherdev(sizeof(struct netfront_info));
41de8d4c 1321 if (!netdev)
0d160211 1322 return ERR_PTR(-ENOMEM);
0d160211
JF		 1323
1324 np = netdev_priv(netdev);
1325 np->xbdev = dev;
1326
1327 spin_lock_init(&np->tx_lock);
1328 spin_lock_init(&np->rx_lock);
1329
1330 skb_queue_head_init(&np->rx_batch);
1331 np->rx_target = RX_DFL_MIN_TARGET;
1332 np->rx_min_target = RX_DFL_MIN_TARGET;
1333 np->rx_max_target = RX_MAX_TARGET;
1334
1335 init_timer(&np->rx_refill_timer);
1336 np->rx_refill_timer.data = (unsigned long)netdev;
1337 np->rx_refill_timer.function = rx_refill_timeout;
1338
e00f85be 1339 err = -ENOMEM;
1340 np->stats = alloc_percpu(struct netfront_stats);
1341 if (np->stats == NULL)
1342 goto exit;
1343
0d160211
JF		 1344 /* Initialise tx_skbs as a free chain containing every entry. */
1345 np->tx_skb_freelist = 0;
1346 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1ffb40b8 1347 skb_entry_set_link(&np->tx_skbs[i], i+1);
0d160211
JF		 1348 np->grant_tx_ref[i] = GRANT_INVALID_REF;
1349 }
1350
1351 /* Clear out rx_skbs */
1352 for (i = 0; i < NET_RX_RING_SIZE; i++) {
1353 np->rx_skbs[i] = NULL;
1354 np->grant_rx_ref[i] = GRANT_INVALID_REF;
1355 }
1356
1357 /* A grant for every tx ring slot */
1358 if (gnttab_alloc_grant_references(TX_MAX_TARGET,
1359 &np->gref_tx_head) < 0) {
383eda32 1360 pr_alert("can't alloc tx grant refs\n");
0d160211 1361 err = -ENOMEM;
e00f85be 1362 goto exit_free_stats;
0d160211
JF		 1363 }
1364 /* A grant for every rx ring slot */
1365 if (gnttab_alloc_grant_references(RX_MAX_TARGET,
1366 &np->gref_rx_head) < 0) {
383eda32 1367 pr_alert("can't alloc rx grant refs\n");
0d160211
JF		 1368 err = -ENOMEM;
1369 goto exit_free_tx;
1370 }
1371
0a0b9d2e
SH		 1372 netdev->netdev_ops = &xennet_netdev_ops;
1373
bea3348e 1374 netif_napi_add(netdev, &np->napi, xennet_poll, 64);
fb507934
MM		 1375 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1376 NETIF_F_GSO_ROBUST;
1377 netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
0d160211 1378
fc3e5941
IC		 1379 /*
1380 * Assume that all hw features are available for now. This set
1381 * will be adjusted by the call to netdev_update_features() in
1382 * xennet_connect() which is the earliest point where we can
1383 * negotiate with the backend regarding supported features.
1384 */
1385 netdev->features |= netdev->hw_features;
1386
0d160211 1387 SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
0d160211
JF		 1388 SET_NETDEV_DEV(netdev, &dev->dev);
1389
9ecd1a75
WL		 1390 netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER);
1391
0d160211
JF		 1392 np->netdev = netdev;
1393
1394 netif_carrier_off(netdev);
1395
1396 return netdev;
1397
1398 exit_free_tx:
1399 gnttab_free_grant_references(np->gref_tx_head);
e00f85be 1400 exit_free_stats:
1401 free_percpu(np->stats);
0d160211
JF		 1402 exit:
1403 free_netdev(netdev);
1404 return ERR_PTR(err);
1405}
1406
1407/**
1408 * Entry point to this code when a new device is created. Allocate the basic
1409 * structures and the ring buffers for communication with the backend, and
1410 * inform the backend of the appropriate details for those.
1411 */
8e0e46bb 1412static int netfront_probe(struct xenbus_device *dev,
1dd06ae8 1413 const struct xenbus_device_id *id)
0d160211
JF		 1414{
1415 int err;
1416 struct net_device *netdev;
1417 struct netfront_info *info;
1418
1419 netdev = xennet_create_dev(dev);
1420 if (IS_ERR(netdev)) {
1421 err = PTR_ERR(netdev);
1422 xenbus_dev_fatal(dev, err, "creating netdev");
1423 return err;
1424 }
1425
1426 info = netdev_priv(netdev);
1b713e00 1427 dev_set_drvdata(&dev->dev, info);
0d160211
JF		 1428
1429 err = register_netdev(info->netdev);
1430 if (err) {
383eda32 1431 pr_warn("%s: register_netdev err=%d\n", __func__, err);
0d160211
JF		 1432 goto fail;
1433 }
1434
1435 err = xennet_sysfs_addif(info->netdev);
1436 if (err) {
1437 unregister_netdev(info->netdev);
383eda32 1438 pr_warn("%s: add sysfs failed err=%d\n", __func__, err);
0d160211
JF		 1439 goto fail;
1440 }
1441
1442 return 0;
1443
1444 fail:
1445 free_netdev(netdev);
1b713e00 1446 dev_set_drvdata(&dev->dev, NULL);
0d160211
JF		 1447 return err;
1448}
1449
1450static void xennet_end_access(int ref, void *page)
1451{
1452 /* This frees the page as a side-effect */
1453 if (ref != GRANT_INVALID_REF)
1454 gnttab_end_foreign_access(ref, 0, (unsigned long)page);
1455}
1456
1457static void xennet_disconnect_backend(struct netfront_info *info)
1458{
1459 /* Stop old i/f to prevent errors whilst we rebuild the state. */
1460 spin_lock_bh(&info->rx_lock);
1461 spin_lock_irq(&info->tx_lock);
1462 netif_carrier_off(info->netdev);
1463 spin_unlock_irq(&info->tx_lock);
1464 spin_unlock_bh(&info->rx_lock);
1465
d634bf2c
WL		 1466 if (info->tx_irq && (info->tx_irq == info->rx_irq))
1467 unbind_from_irqhandler(info->tx_irq, info);
1468 if (info->tx_irq && (info->tx_irq != info->rx_irq)) {
1469 unbind_from_irqhandler(info->tx_irq, info);
1470 unbind_from_irqhandler(info->rx_irq, info);
1471 }
1472 info->tx_evtchn = info->rx_evtchn = 0;
1473 info->tx_irq = info->rx_irq = 0;
0d160211
JF		 1474
1475 /* End access and free the pages */
1476 xennet_end_access(info->tx_ring_ref, info->tx.sring);
1477 xennet_end_access(info->rx_ring_ref, info->rx.sring);
1478
1479 info->tx_ring_ref = GRANT_INVALID_REF;
1480 info->rx_ring_ref = GRANT_INVALID_REF;
1481 info->tx.sring = NULL;
1482 info->rx.sring = NULL;
1483}
1484
1485/**
1486 * We are reconnecting to the backend, due to a suspend/resume, or a backend
1487 * driver restart. We tear down our netif structure and recreate it, but
1488 * leave the device-layer structures intact so that this is transparent to the
1489 * rest of the kernel.
1490 */
1491static int netfront_resume(struct xenbus_device *dev)
1492{
1b713e00 1493 struct netfront_info *info = dev_get_drvdata(&dev->dev);
0d160211
JF		 1494
1495 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1496
1497 xennet_disconnect_backend(info);
1498 return 0;
1499}
1500
1501static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
1502{
1503 char *s, *e, *macstr;
1504 int i;
1505
1506 macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
1507 if (IS_ERR(macstr))
1508 return PTR_ERR(macstr);
1509
1510 for (i = 0; i < ETH_ALEN; i++) {
1511 mac[i] = simple_strtoul(s, &e, 16);
1512 if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
1513 kfree(macstr);
1514 return -ENOENT;
1515 }
1516 s = e+1;
1517 }
1518
1519 kfree(macstr);
1520 return 0;
1521}
1522
d634bf2c
WL		 1523static int setup_netfront_single(struct netfront_info *info)
1524{
1525 int err;
1526
1527 err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
1528 if (err < 0)
1529 goto fail;
1530
1531 err = bind_evtchn_to_irqhandler(info->tx_evtchn,
1532 xennet_interrupt,
1533 0, info->netdev->name, info);
1534 if (err < 0)
1535 goto bind_fail;
1536 info->rx_evtchn = info->tx_evtchn;
1537 info->rx_irq = info->tx_irq = err;
1538
1539 return 0;
1540
1541bind_fail:
1542 xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
1543 info->tx_evtchn = 0;
1544fail:
1545 return err;
1546}
1547
1548static int setup_netfront_split(struct netfront_info *info)
1549{
1550 int err;
1551
1552 err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
1553 if (err < 0)
1554 goto fail;
1555 err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn);
1556 if (err < 0)
1557 goto alloc_rx_evtchn_fail;
1558
1559 snprintf(info->tx_irq_name, sizeof(info->tx_irq_name),
1560 "%s-tx", info->netdev->name);
1561 err = bind_evtchn_to_irqhandler(info->tx_evtchn,
1562 xennet_tx_interrupt,
1563 0, info->tx_irq_name, info);
1564 if (err < 0)
1565 goto bind_tx_fail;
1566 info->tx_irq = err;
1567
1568 snprintf(info->rx_irq_name, sizeof(info->rx_irq_name),
1569 "%s-rx", info->netdev->name);
1570 err = bind_evtchn_to_irqhandler(info->rx_evtchn,
1571 xennet_rx_interrupt,
1572 0, info->rx_irq_name, info);
1573 if (err < 0)
1574 goto bind_rx_fail;
1575 info->rx_irq = err;
1576
1577 return 0;
1578
1579bind_rx_fail:
1580 unbind_from_irqhandler(info->tx_irq, info);
1581 info->tx_irq = 0;
1582bind_tx_fail:
1583 xenbus_free_evtchn(info->xbdev, info->rx_evtchn);
1584 info->rx_evtchn = 0;
1585alloc_rx_evtchn_fail:
1586 xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
1587 info->tx_evtchn = 0;
1588fail:
1589 return err;
1590}
1591
0d160211
JF		 1592static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
1593{
1594 struct xen_netif_tx_sring *txs;
1595 struct xen_netif_rx_sring *rxs;
1596 int err;
1597 struct net_device *netdev = info->netdev;
d634bf2c 1598 unsigned int feature_split_evtchn;
0d160211
JF		 1599
1600 info->tx_ring_ref = GRANT_INVALID_REF;
1601 info->rx_ring_ref = GRANT_INVALID_REF;
1602 info->rx.sring = NULL;
1603 info->tx.sring = NULL;
1604 netdev->irq = 0;
1605
d634bf2c
WL		 1606 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1607 "feature-split-event-channels", "%u",
1608 &feature_split_evtchn);
1609 if (err < 0)
1610 feature_split_evtchn = 0;
1611
0d160211
JF		 1612 err = xen_net_read_mac(dev, netdev->dev_addr);
1613 if (err) {
1614 xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
1615 goto fail;
1616 }
1617
a144ff09 1618 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
0d160211
JF		 1619 if (!txs) {
1620 err = -ENOMEM;
1621 xenbus_dev_fatal(dev, err, "allocating tx ring page");
1622 goto fail;
1623 }
1624 SHARED_RING_INIT(txs);
1625 FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
1626
1627 err = xenbus_grant_ring(dev, virt_to_mfn(txs));
1ca2983a
WL		 1628 if (err < 0)
1629 goto grant_tx_ring_fail;
0d160211
JF		 1630
1631 info->tx_ring_ref = err;
a144ff09 1632 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
0d160211
JF		 1633 if (!rxs) {
1634 err = -ENOMEM;
1635 xenbus_dev_fatal(dev, err, "allocating rx ring page");
1ca2983a 1636 goto alloc_rx_ring_fail;
0d160211
JF		 1637 }
1638 SHARED_RING_INIT(rxs);
1639 FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
1640
1641 err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
1ca2983a
WL		 1642 if (err < 0)
1643 goto grant_rx_ring_fail;
0d160211
JF		 1644 info->rx_ring_ref = err;
1645
d634bf2c
WL		 1646 if (feature_split_evtchn)
1647 err = setup_netfront_split(info);
1648 /* setup single event channel if
1649 * a) feature-split-event-channels == 0
1650 * b) feature-split-event-channels == 1 but failed to setup
1651 */
1652 if (!feature_split_evtchn || (feature_split_evtchn && err))
1653 err = setup_netfront_single(info);
1654
0d160211 1655 if (err)
1ca2983a 1656 goto alloc_evtchn_fail;
0d160211 1657
0d160211
JF		 1658 return 0;
1659
1ca2983a
WL		 1660 /* If we fail to setup netfront, it is safe to just revoke access to
1661 * granted pages because backend is not accessing it at this point.
1662 */
1ca2983a
WL		 1663alloc_evtchn_fail:
1664 gnttab_end_foreign_access_ref(info->rx_ring_ref, 0);
1665grant_rx_ring_fail:
1666 free_page((unsigned long)rxs);
1667alloc_rx_ring_fail:
1668 gnttab_end_foreign_access_ref(info->tx_ring_ref, 0);
1669grant_tx_ring_fail:
1670 free_page((unsigned long)txs);
1671fail:
0d160211
JF		 1672 return err;
1673}
1674
1675/* Common code used when first setting up, and when resuming. */
f502bf2b 1676static int talk_to_netback(struct xenbus_device *dev,
0d160211
JF		 1677 struct netfront_info *info)
1678{
1679 const char *message;
1680 struct xenbus_transaction xbt;
1681 int err;
1682
1683 /* Create shared ring, alloc event channel. */
1684 err = setup_netfront(dev, info);
1685 if (err)
1686 goto out;
1687
1688again:
1689 err = xenbus_transaction_start(&xbt);
1690 if (err) {
1691 xenbus_dev_fatal(dev, err, "starting transaction");
1692 goto destroy_ring;
1693 }
1694
1695 err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u",
1696 info->tx_ring_ref);
1697 if (err) {
1698 message = "writing tx ring-ref";
1699 goto abort_transaction;
1700 }
1701 err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u",
1702 info->rx_ring_ref);
1703 if (err) {
1704 message = "writing rx ring-ref";
1705 goto abort_transaction;
1706 }
d634bf2c
WL		 1707
1708 if (info->tx_evtchn == info->rx_evtchn) {
1709 err = xenbus_printf(xbt, dev->nodename,
1710 "event-channel", "%u", info->tx_evtchn);
1711 if (err) {
1712 message = "writing event-channel";
1713 goto abort_transaction;
1714 }
1715 } else {
1716 err = xenbus_printf(xbt, dev->nodename,
1717 "event-channel-tx", "%u", info->tx_evtchn);
1718 if (err) {
1719 message = "writing event-channel-tx";
1720 goto abort_transaction;
1721 }
1722 err = xenbus_printf(xbt, dev->nodename,
1723 "event-channel-rx", "%u", info->rx_evtchn);
1724 if (err) {
1725 message = "writing event-channel-rx";
1726 goto abort_transaction;
1727 }
0d160211
JF		 1728 }
1729
1730 err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
1731 1);
1732 if (err) {
1733 message = "writing request-rx-copy";
1734 goto abort_transaction;
1735 }
1736
1737 err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
1738 if (err) {
1739 message = "writing feature-rx-notify";
1740 goto abort_transaction;
1741 }
1742
1743 err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
1744 if (err) {
1745 message = "writing feature-sg";
1746 goto abort_transaction;
1747 }
1748
1749 err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
1750 if (err) {
1751 message = "writing feature-gso-tcpv4";
1752 goto abort_transaction;
1753 }
1754
1755 err = xenbus_transaction_end(xbt, 0);
1756 if (err) {
1757 if (err == -EAGAIN)
1758 goto again;
1759 xenbus_dev_fatal(dev, err, "completing transaction");
1760 goto destroy_ring;
1761 }
1762
1763 return 0;
1764
1765 abort_transaction:
1766 xenbus_transaction_end(xbt, 1);
1767 xenbus_dev_fatal(dev, err, "%s", message);
1768 destroy_ring:
1769 xennet_disconnect_backend(info);
1770 out:
1771 return err;
1772}
1773
0d160211
JF		 1774static int xennet_connect(struct net_device *dev)
1775{
1776 struct netfront_info *np = netdev_priv(dev);
1777 int i, requeue_idx, err;
1778 struct sk_buff *skb;
1779 grant_ref_t ref;
1780 struct xen_netif_rx_request *req;
1781 unsigned int feature_rx_copy;
1782
1783 err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1784 "feature-rx-copy", "%u", &feature_rx_copy);
1785 if (err != 1)
1786 feature_rx_copy = 0;
1787
1788 if (!feature_rx_copy) {
1789 dev_info(&dev->dev,
898eb71c 1790 "backend does not support copying receive path\n");
0d160211
JF		 1791 return -ENODEV;
1792 }
1793
f502bf2b 1794 err = talk_to_netback(np->xbdev, np);
0d160211
JF		 1795 if (err)
1796 return err;
1797
1ba37c51 1798 rtnl_lock();
fb507934 1799 netdev_update_features(dev);
1ba37c51 1800 rtnl_unlock();
0d160211
JF		 1801
1802 spin_lock_bh(&np->rx_lock);
1803 spin_lock_irq(&np->tx_lock);
1804
1805 /* Step 1: Discard all pending TX packet fragments. */
1806 xennet_release_tx_bufs(np);
1807
1808 /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
1809 for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
01c68026
IC		 1810 skb_frag_t *frag;
1811 const struct page *page;
0d160211
JF		 1812 if (!np->rx_skbs[i])
1813 continue;
1814
1815 skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i);
1816 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
1817 req = RING_GET_REQUEST(&np->rx, requeue_idx);
1818
01c68026
IC		 1819 frag = &skb_shinfo(skb)->frags[0];
1820 page = skb_frag_page(frag);
0d160211
JF		 1821 gnttab_grant_foreign_access_ref(
1822 ref, np->xbdev->otherend_id,
01c68026 1823 pfn_to_mfn(page_to_pfn(page)),
0d160211
JF		 1824 0);
1825 req->gref = ref;
1826 req->id = requeue_idx;
1827
1828 requeue_idx++;
1829 }
1830
1831 np->rx.req_prod_pvt = requeue_idx;
1832
1833 /*
1834 * Step 3: All public and private state should now be sane. Get
1835 * ready to start sending and receiving packets and give the driver
1836 * domain a kick because we've probably just requeued some
1837 * packets.
1838 */
1839 netif_carrier_on(np->netdev);
d634bf2c
WL		 1840 notify_remote_via_irq(np->tx_irq);
1841 if (np->tx_irq != np->rx_irq)
1842 notify_remote_via_irq(np->rx_irq);
0d160211
JF		 1843 xennet_tx_buf_gc(dev);
1844 xennet_alloc_rx_buffers(dev);
1845
1846 spin_unlock_irq(&np->tx_lock);
1847 spin_unlock_bh(&np->rx_lock);
1848
1849 return 0;
1850}
1851
1852/**
1853 * Callback received when the backend's state changes.
1854 */
f502bf2b 1855static void netback_changed(struct xenbus_device *dev,
0d160211
JF		 1856 enum xenbus_state backend_state)
1857{
1b713e00 1858 struct netfront_info *np = dev_get_drvdata(&dev->dev);
0d160211
JF		 1859 struct net_device *netdev = np->netdev;
1860
1861 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
1862
1863 switch (backend_state) {
1864 case XenbusStateInitialising:
1865 case XenbusStateInitialised:
b78c9512
NI		 1866 case XenbusStateReconfiguring:
1867 case XenbusStateReconfigured:
0d160211
JF		 1868 case XenbusStateUnknown:
1869 case XenbusStateClosed:
1870 break;
1871
1872 case XenbusStateInitWait:
1873 if (dev->state != XenbusStateInitialising)
1874 break;
1875 if (xennet_connect(netdev) != 0)
1876 break;
1877 xenbus_switch_state(dev, XenbusStateConnected);
08e34eb1
LE		 1878 break;
1879
1880 case XenbusStateConnected:
ee89bab1 1881 netdev_notify_peers(netdev);
0d160211
JF		 1882 break;
1883
1884 case XenbusStateClosing:
1885 xenbus_frontend_closed(dev);
1886 break;
1887 }
1888}
1889
e0ce4af9
IC		 1890static const struct xennet_stat {
1891 char name[ETH_GSTRING_LEN];
1892 u16 offset;
1893} xennet_stats[] = {
1894 {
1895 "rx_gso_checksum_fixup",
1896 offsetof(struct netfront_info, rx_gso_checksum_fixup)
1897 },
1898};
1899
1900static int xennet_get_sset_count(struct net_device *dev, int string_set)
1901{
1902 switch (string_set) {
1903 case ETH_SS_STATS:
1904 return ARRAY_SIZE(xennet_stats);
1905 default:
1906 return -EINVAL;
1907 }
1908}
1909
1910static void xennet_get_ethtool_stats(struct net_device *dev,
1911 struct ethtool_stats *stats, u64 * data)
1912{
1913 void *np = netdev_priv(dev);
1914 int i;
1915
1916 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
48f26d51 1917 data[i] = *(unsigned long *)(np + xennet_stats[i].offset);
e0ce4af9
IC		 1918}
1919
1920static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
1921{
1922 int i;
1923
1924 switch (stringset) {
1925 case ETH_SS_STATS:
1926 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
1927 memcpy(data + i * ETH_GSTRING_LEN,
1928 xennet_stats[i].name, ETH_GSTRING_LEN);
1929 break;
1930 }
1931}
1932
0fc0b732 1933static const struct ethtool_ops xennet_ethtool_ops =
0d160211 1934{
0d160211 1935 .get_link = ethtool_op_get_link,
e0ce4af9
IC		 1936
1937 .get_sset_count = xennet_get_sset_count,
1938 .get_ethtool_stats = xennet_get_ethtool_stats,
1939 .get_strings = xennet_get_strings,
0d160211
JF		 1940};
1941
1942#ifdef CONFIG_SYSFS
1943static ssize_t show_rxbuf_min(struct device *dev,
1944 struct device_attribute *attr, char *buf)
1945{
1946 struct net_device *netdev = to_net_dev(dev);
1947 struct netfront_info *info = netdev_priv(netdev);
1948
1949 return sprintf(buf, "%u\n", info->rx_min_target);
1950}
1951
1952static ssize_t store_rxbuf_min(struct device *dev,
1953 struct device_attribute *attr,
1954 const char *buf, size_t len)
1955{
1956 struct net_device *netdev = to_net_dev(dev);
1957 struct netfront_info *np = netdev_priv(netdev);
1958 char *endp;
1959 unsigned long target;
1960
1961 if (!capable(CAP_NET_ADMIN))
1962 return -EPERM;
1963
1964 target = simple_strtoul(buf, &endp, 0);
1965 if (endp == buf)
1966 return -EBADMSG;
1967
1968 if (target < RX_MIN_TARGET)
1969 target = RX_MIN_TARGET;
1970 if (target > RX_MAX_TARGET)
1971 target = RX_MAX_TARGET;
1972
1973 spin_lock_bh(&np->rx_lock);
1974 if (target > np->rx_max_target)
1975 np->rx_max_target = target;
1976 np->rx_min_target = target;
1977 if (target > np->rx_target)
1978 np->rx_target = target;
1979
1980 xennet_alloc_rx_buffers(netdev);
1981
1982 spin_unlock_bh(&np->rx_lock);
1983 return len;
1984}
1985
1986static ssize_t show_rxbuf_max(struct device *dev,
1987 struct device_attribute *attr, char *buf)
1988{
1989 struct net_device *netdev = to_net_dev(dev);
1990 struct netfront_info *info = netdev_priv(netdev);
1991
1992 return sprintf(buf, "%u\n", info->rx_max_target);
1993}
1994
1995static ssize_t store_rxbuf_max(struct device *dev,
1996 struct device_attribute *attr,
1997 const char *buf, size_t len)
1998{
1999 struct net_device *netdev = to_net_dev(dev);
2000 struct netfront_info *np = netdev_priv(netdev);
2001 char *endp;
2002 unsigned long target;
2003
2004 if (!capable(CAP_NET_ADMIN))
2005 return -EPERM;
2006
2007 target = simple_strtoul(buf, &endp, 0);
2008 if (endp == buf)
2009 return -EBADMSG;
2010
2011 if (target < RX_MIN_TARGET)
2012 target = RX_MIN_TARGET;
2013 if (target > RX_MAX_TARGET)
2014 target = RX_MAX_TARGET;
2015
2016 spin_lock_bh(&np->rx_lock);
2017 if (target < np->rx_min_target)
2018 np->rx_min_target = target;
2019 np->rx_max_target = target;
2020 if (target < np->rx_target)
2021 np->rx_target = target;
2022
2023 xennet_alloc_rx_buffers(netdev);
2024
2025 spin_unlock_bh(&np->rx_lock);
2026 return len;
2027}
2028
2029static ssize_t show_rxbuf_cur(struct device *dev,
2030 struct device_attribute *attr, char *buf)
2031{
2032 struct net_device *netdev = to_net_dev(dev);
2033 struct netfront_info *info = netdev_priv(netdev);
2034
2035 return sprintf(buf, "%u\n", info->rx_target);
2036}
2037
2038static struct device_attribute xennet_attrs[] = {
2039 __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min),
2040 __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max),
2041 __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL),
2042};
2043
2044static int xennet_sysfs_addif(struct net_device *netdev)
2045{
2046 int i;
2047 int err;
2048
2049 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) {
2050 err = device_create_file(&netdev->dev,
2051 &xennet_attrs[i]);
2052 if (err)
2053 goto fail;
2054 }
2055 return 0;
2056
2057 fail:
2058 while (--i >= 0)
2059 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2060 return err;
2061}
2062
2063static void xennet_sysfs_delif(struct net_device *netdev)
2064{
2065 int i;
2066
2067 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++)
2068 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2069}
2070
2071#endif /* CONFIG_SYSFS */
2072
73db144b 2073static const struct xenbus_device_id netfront_ids[] = {
0d160211
JF		 2074 { "vif" },
2075 { "" }
2076};
2077
2078
8e0e46bb 2079static int xennet_remove(struct xenbus_device *dev)
0d160211 2080{
1b713e00 2081 struct netfront_info *info = dev_get_drvdata(&dev->dev);
0d160211
JF		 2082
2083 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2084
0d160211
JF		 2085 xennet_disconnect_backend(info);
2086
0d160211
JF		 2087 xennet_sysfs_delif(info->netdev);
2088
6bc96d04
IC		 2089 unregister_netdev(info->netdev);
2090
2091 del_timer_sync(&info->rx_refill_timer);
2092
e00f85be 2093 free_percpu(info->stats);
2094
0d160211
JF		 2095 free_netdev(info->netdev);
2096
2097 return 0;
2098}
2099
73db144b 2100static DEFINE_XENBUS_DRIVER(netfront, ,
0d160211 2101 .probe = netfront_probe,
8e0e46bb 2102 .remove = xennet_remove,
0d160211 2103 .resume = netfront_resume,
f502bf2b 2104 .otherend_changed = netback_changed,
73db144b 2105);
0d160211
JF		 2106
2107static int __init netif_init(void)
2108{
6e833587 2109 if (!xen_domain())
0d160211
JF		 2110 return -ENODEV;
2111
e95ae5a4 2112 if (xen_hvm_domain() && !xen_platform_pci_unplug)
b9136d20
IM		 2113 return -ENODEV;
2114
383eda32 2115 pr_info("Initialising Xen virtual ethernet driver\n");
0d160211 2116
ffb78a26 2117 return xenbus_register_frontend(&netfront_driver);
0d160211
JF		 2118}
2119module_init(netif_init);
2120
2121
2122static void __exit netif_exit(void)
2123{
ffb78a26 2124 xenbus_unregister_driver(&netfront_driver);
0d160211
JF		 2125}
2126module_exit(netif_exit);
2127
2128MODULE_DESCRIPTION("Xen virtual network device frontend");
2129MODULE_LICENSE("GPL");
d2f0c52b 2130MODULE_ALIAS("xen:vif");
4f93f09b 2131MODULE_ALIAS("xennet");
Linux kernel - Deliverables
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