blob: dd1011e55cb598096ef7c2ad64981a2572b760d7 [file] [log] [blame]
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001/*
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
Joe Perches383eda32013-06-27 21:57:49 -070032#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070034#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>
Wei Liu9ecd1a72013-04-22 02:20:41 +000041#include <net/tcp.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070042#include <linux/udp.h>
43#include <linux/moduleparam.h>
44#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090045#include <linux/slab.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070046#include <net/ip.h>
47
Stefano Stabellinica981632012-08-08 17:21:23 +000048#include <asm/xen/page.h>
Jeremy Fitzhardinge1ccbf532009-10-06 15:11:14 -070049#include <xen/xen.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070050#include <xen/xenbus.h>
51#include <xen/events.h>
52#include <xen/page.h>
Igor Mammedovb9136d22012-03-21 15:08:38 +010053#include <xen/platform_pci.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070054#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
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070060static const struct ethtool_ops xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070061
62struct netfront_cb {
Ian Campbell36832432012-08-22 00:26:47 +000063 int pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070064};
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
Jeremy Fitzhardinge667c78af2010-12-08 12:39:12 -080072#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)
Wei Liu40206dd2012-01-26 07:23:23 +000074#define TX_MAX_TARGET min_t(int, NET_TX_RING_SIZE, 256)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070075
stephen hemmingere00f85b2011-06-21 05:35:31 +000076struct 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
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070084struct netfront_info {
85 struct list_head list;
86 struct net_device *netdev;
87
Stephen Hemmingerbea33482007-10-03 16:41:36 -070088 struct napi_struct napi;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070089
Wei Liud634bf22013-05-22 06:34:46 +000090 /* 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
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -070099 struct xenbus_device *xbdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700100
101 spinlock_t tx_lock;
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700102 struct xen_netif_tx_front_ring tx;
103 int tx_ring_ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700104
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;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700116 unsigned long link;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700117 } 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
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700122 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
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700135 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
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700139 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];
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000142
143 /* Statistics */
stephen hemmingere00f85b2011-06-21 05:35:31 +0000144 struct netfront_stats __percpu *stats;
145
Ian Campbelle9a799e2011-03-10 07:04:18 +0000146 unsigned long rx_gso_checksum_fixup;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700147};
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
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700154static 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));
Eric Dumazet807540b2010-09-23 05:40:09 +0000162 return (unsigned long)list->skb < PAGE_OFFSET;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700163}
164
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700165/*
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{
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700172 skb_entry_set_link(&list[id], *head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700173 *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
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000215static bool xennet_can_sg(struct net_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700216{
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000217 return dev->features & NETIF_F_SG;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700218}
219
220
221static void rx_refill_timeout(unsigned long data)
222{
223 struct net_device *dev = (struct net_device *)data;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700224 struct netfront_info *np = netdev_priv(dev);
Ben Hutchings288379f2009-01-19 16:43:59 -0800225 napi_schedule(&np->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700226}
227
228static int netfront_tx_slot_available(struct netfront_info *np)
229{
Eric Dumazet807540b2010-09-23 05:40:09 +0000230 return (np->tx.req_prod_pvt - np->tx.rsp_cons) <
231 (TX_MAX_TARGET - MAX_SKB_FRAGS - 2);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700232}
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;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700252 grant_ref_t ref;
253 unsigned long pfn;
254 void *vaddr;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700255 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++) {
Isaku Yamahata617a20b2008-10-14 17:50:42 -0700268 skb = __netdev_alloc_skb(dev, RX_COPY_THRESHOLD + NET_IP_ALIGN,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700269 GFP_ATOMIC | __GFP_NOWARN);
270 if (unlikely(!skb))
271 goto no_skb;
272
Isaku Yamahata617a20b2008-10-14 17:50:42 -0700273 /* Align ip header to a 16 bytes boundary */
274 skb_reserve(skb, NET_IP_ALIGN);
275
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700276 page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
277 if (!page) {
278 kfree_skb(skb);
279no_skb:
280 /* Any skbuffs queued for refill? Force them out. */
281 if (i != 0)
282 goto refill;
283 /* Could not allocate any skbuffs. Try again later. */
284 mod_timer(&np->rx_refill_timer,
285 jiffies + (HZ/10));
286 break;
287 }
288
Jan Beulich093b9c72013-07-17 08:09:37 +0100289 skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700290 __skb_queue_tail(&np->rx_batch, skb);
291 }
292
293 /* Is the batch large enough to be worthwhile? */
294 if (i < (np->rx_target/2)) {
295 if (req_prod > np->rx.sring->req_prod)
296 goto push;
297 return;
298 }
299
300 /* Adjust our fill target if we risked running out of buffers. */
301 if (((req_prod - np->rx.sring->rsp_prod) < (np->rx_target / 4)) &&
302 ((np->rx_target *= 2) > np->rx_max_target))
303 np->rx_target = np->rx_max_target;
304
305 refill:
Jeremy Fitzhardinge5dcddfa2007-08-07 14:56:42 -0700306 for (i = 0; ; i++) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700307 skb = __skb_dequeue(&np->rx_batch);
308 if (skb == NULL)
309 break;
310
311 skb->dev = dev;
312
313 id = xennet_rxidx(req_prod + i);
314
315 BUG_ON(np->rx_skbs[id]);
316 np->rx_skbs[id] = skb;
317
318 ref = gnttab_claim_grant_reference(&np->gref_rx_head);
319 BUG_ON((signed short)ref < 0);
320 np->grant_rx_ref[id] = ref;
321
Ian Campbell01c68022011-10-05 00:28:47 +0000322 pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
323 vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0]));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700324
325 req = RING_GET_REQUEST(&np->rx, req_prod + i);
326 gnttab_grant_foreign_access_ref(ref,
327 np->xbdev->otherend_id,
328 pfn_to_mfn(pfn),
329 0);
330
331 req->id = id;
332 req->gref = ref;
333 }
334
Jeremy Fitzhardinge5dcddfa2007-08-07 14:56:42 -0700335 wmb(); /* barrier so backend seens requests */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700336
337 /* Above is a suitable barrier to ensure backend will see requests. */
338 np->rx.req_prod_pvt = req_prod + i;
339 push:
340 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
341 if (notify)
Wei Liud634bf22013-05-22 06:34:46 +0000342 notify_remote_via_irq(np->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700343}
344
345static int xennet_open(struct net_device *dev)
346{
347 struct netfront_info *np = netdev_priv(dev);
348
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700349 napi_enable(&np->napi);
350
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700351 spin_lock_bh(&np->rx_lock);
352 if (netif_carrier_ok(dev)) {
353 xennet_alloc_rx_buffers(dev);
354 np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
355 if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
Ben Hutchings288379f2009-01-19 16:43:59 -0800356 napi_schedule(&np->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700357 }
358 spin_unlock_bh(&np->rx_lock);
359
Eduardo Habkost0b1ab1b2008-07-31 17:36:55 -0300360 netif_start_queue(dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700361
362 return 0;
363}
364
365static void xennet_tx_buf_gc(struct net_device *dev)
366{
367 RING_IDX cons, prod;
368 unsigned short id;
369 struct netfront_info *np = netdev_priv(dev);
370 struct sk_buff *skb;
371
372 BUG_ON(!netif_carrier_ok(dev));
373
374 do {
375 prod = np->tx.sring->rsp_prod;
376 rmb(); /* Ensure we see responses up to 'rp'. */
377
378 for (cons = np->tx.rsp_cons; cons != prod; cons++) {
379 struct xen_netif_tx_response *txrsp;
380
381 txrsp = RING_GET_RESPONSE(&np->tx, cons);
Ian Campbellf942dc22011-03-15 00:06:18 +0000382 if (txrsp->status == XEN_NETIF_RSP_NULL)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700383 continue;
384
385 id = txrsp->id;
386 skb = np->tx_skbs[id].skb;
387 if (unlikely(gnttab_query_foreign_access(
388 np->grant_tx_ref[id]) != 0)) {
Joe Perches383eda32013-06-27 21:57:49 -0700389 pr_alert("%s: warning -- grant still in use by backend domain\n",
390 __func__);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700391 BUG();
392 }
393 gnttab_end_foreign_access_ref(
394 np->grant_tx_ref[id], GNTMAP_readonly);
395 gnttab_release_grant_reference(
396 &np->gref_tx_head, np->grant_tx_ref[id]);
397 np->grant_tx_ref[id] = GRANT_INVALID_REF;
398 add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, id);
399 dev_kfree_skb_irq(skb);
400 }
401
402 np->tx.rsp_cons = prod;
403
404 /*
405 * Set a new event, then check for race with update of tx_cons.
406 * Note that it is essential to schedule a callback, no matter
407 * how few buffers are pending. Even if there is space in the
408 * transmit ring, higher layers may be blocked because too much
409 * data is outstanding: in such cases notification from Xen is
410 * likely to be the only kick that we'll get.
411 */
412 np->tx.sring->rsp_event =
413 prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
414 mb(); /* update shared area */
415 } while ((cons == prod) && (prod != np->tx.sring->rsp_prod));
416
417 xennet_maybe_wake_tx(dev);
418}
419
420static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
421 struct xen_netif_tx_request *tx)
422{
423 struct netfront_info *np = netdev_priv(dev);
424 char *data = skb->data;
425 unsigned long mfn;
426 RING_IDX prod = np->tx.req_prod_pvt;
427 int frags = skb_shinfo(skb)->nr_frags;
428 unsigned int offset = offset_in_page(data);
429 unsigned int len = skb_headlen(skb);
430 unsigned int id;
431 grant_ref_t ref;
432 int i;
433
434 /* While the header overlaps a page boundary (including being
435 larger than a page), split it it into page-sized chunks. */
436 while (len > PAGE_SIZE - offset) {
437 tx->size = PAGE_SIZE - offset;
Ian Campbellf942dc22011-03-15 00:06:18 +0000438 tx->flags |= XEN_NETTXF_more_data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700439 len -= tx->size;
440 data += tx->size;
441 offset = 0;
442
443 id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
444 np->tx_skbs[id].skb = skb_get(skb);
445 tx = RING_GET_REQUEST(&np->tx, prod++);
446 tx->id = id;
447 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
448 BUG_ON((signed short)ref < 0);
449
450 mfn = virt_to_mfn(data);
451 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
452 mfn, GNTMAP_readonly);
453
454 tx->gref = np->grant_tx_ref[id] = ref;
455 tx->offset = offset;
456 tx->size = len;
457 tx->flags = 0;
458 }
459
460 /* Grant backend access to each skb fragment page. */
461 for (i = 0; i < frags; i++) {
462 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
Ian Campbellf36c3742012-11-21 02:02:16 +0000463 struct page *page = skb_frag_page(frag);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700464
Ian Campbellf36c3742012-11-21 02:02:16 +0000465 len = skb_frag_size(frag);
466 offset = frag->page_offset;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700467
Ian Campbellf36c3742012-11-21 02:02:16 +0000468 /* Data must not cross a page boundary. */
469 BUG_ON(len + offset > PAGE_SIZE<<compound_order(page));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700470
Ian Campbellf36c3742012-11-21 02:02:16 +0000471 /* Skip unused frames from start of page */
472 page += offset >> PAGE_SHIFT;
473 offset &= ~PAGE_MASK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700474
Ian Campbellf36c3742012-11-21 02:02:16 +0000475 while (len > 0) {
476 unsigned long bytes;
477
478 BUG_ON(offset >= PAGE_SIZE);
479
480 bytes = PAGE_SIZE - offset;
481 if (bytes > len)
482 bytes = len;
483
484 tx->flags |= XEN_NETTXF_more_data;
485
486 id = get_id_from_freelist(&np->tx_skb_freelist,
487 np->tx_skbs);
488 np->tx_skbs[id].skb = skb_get(skb);
489 tx = RING_GET_REQUEST(&np->tx, prod++);
490 tx->id = id;
491 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
492 BUG_ON((signed short)ref < 0);
493
494 mfn = pfn_to_mfn(page_to_pfn(page));
495 gnttab_grant_foreign_access_ref(ref,
496 np->xbdev->otherend_id,
497 mfn, GNTMAP_readonly);
498
499 tx->gref = np->grant_tx_ref[id] = ref;
500 tx->offset = offset;
501 tx->size = bytes;
502 tx->flags = 0;
503
504 offset += bytes;
505 len -= bytes;
506
507 /* Next frame */
508 if (offset == PAGE_SIZE && len) {
509 BUG_ON(!PageCompound(page));
510 page++;
511 offset = 0;
512 }
513 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700514 }
515
516 np->tx.req_prod_pvt = prod;
517}
518
Ian Campbellf36c3742012-11-21 02:02:16 +0000519/*
520 * Count how many ring slots are required to send the frags of this
521 * skb. Each frag might be a compound page.
522 */
523static int xennet_count_skb_frag_slots(struct sk_buff *skb)
524{
525 int i, frags = skb_shinfo(skb)->nr_frags;
526 int pages = 0;
527
528 for (i = 0; i < frags; i++) {
529 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
530 unsigned long size = skb_frag_size(frag);
531 unsigned long offset = frag->page_offset;
532
533 /* Skip unused frames from start of page */
534 offset &= ~PAGE_MASK;
535
536 pages += PFN_UP(offset + size);
537 }
538
539 return pages;
540}
541
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700542static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
543{
544 unsigned short id;
545 struct netfront_info *np = netdev_priv(dev);
stephen hemmingere00f85b2011-06-21 05:35:31 +0000546 struct netfront_stats *stats = this_cpu_ptr(np->stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700547 struct xen_netif_tx_request *tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700548 char *data = skb->data;
549 RING_IDX i;
550 grant_ref_t ref;
551 unsigned long mfn;
552 int notify;
Ian Campbellf36c3742012-11-21 02:02:16 +0000553 int slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700554 unsigned int offset = offset_in_page(data);
555 unsigned int len = skb_headlen(skb);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000556 unsigned long flags;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700557
Wei Liu9ecd1a72013-04-22 02:20:41 +0000558 /* If skb->len is too big for wire format, drop skb and alert
559 * user about misconfiguration.
560 */
561 if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
562 net_alert_ratelimited(
563 "xennet: skb->len = %u, too big for wire format\n",
564 skb->len);
565 goto drop;
566 }
567
Ian Campbellf36c3742012-11-21 02:02:16 +0000568 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) +
569 xennet_count_skb_frag_slots(skb);
570 if (unlikely(slots > MAX_SKB_FRAGS + 1)) {
571 net_alert_ratelimited(
572 "xennet: skb rides the rocket: %d slots\n", slots);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700573 goto drop;
574 }
575
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000576 spin_lock_irqsave(&np->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700577
578 if (unlikely(!netif_carrier_ok(dev) ||
Ian Campbellf36c3742012-11-21 02:02:16 +0000579 (slots > 1 && !xennet_can_sg(dev)) ||
Jesse Grossfc741212011-01-09 06:23:32 +0000580 netif_needs_gso(skb, netif_skb_features(skb)))) {
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000581 spin_unlock_irqrestore(&np->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700582 goto drop;
583 }
584
585 i = np->tx.req_prod_pvt;
586
587 id = get_id_from_freelist(&np->tx_skb_freelist, np->tx_skbs);
588 np->tx_skbs[id].skb = skb;
589
590 tx = RING_GET_REQUEST(&np->tx, i);
591
592 tx->id = id;
593 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
594 BUG_ON((signed short)ref < 0);
595 mfn = virt_to_mfn(data);
596 gnttab_grant_foreign_access_ref(
597 ref, np->xbdev->otherend_id, mfn, GNTMAP_readonly);
598 tx->gref = np->grant_tx_ref[id] = ref;
599 tx->offset = offset;
600 tx->size = len;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700601
602 tx->flags = 0;
603 if (skb->ip_summed == CHECKSUM_PARTIAL)
604 /* local packet? */
Ian Campbellf942dc22011-03-15 00:06:18 +0000605 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700606 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
607 /* remote but checksummed. */
Ian Campbellf942dc22011-03-15 00:06:18 +0000608 tx->flags |= XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700609
610 if (skb_shinfo(skb)->gso_size) {
611 struct xen_netif_extra_info *gso;
612
613 gso = (struct xen_netif_extra_info *)
614 RING_GET_REQUEST(&np->tx, ++i);
615
Wei Liue2d617c02013-03-25 01:08:17 +0000616 tx->flags |= XEN_NETTXF_extra_info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700617
618 gso->u.gso.size = skb_shinfo(skb)->gso_size;
619 gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4;
620 gso->u.gso.pad = 0;
621 gso->u.gso.features = 0;
622
623 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
624 gso->flags = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700625 }
626
627 np->tx.req_prod_pvt = i + 1;
628
629 xennet_make_frags(skb, dev, tx);
630 tx->size = skb->len;
631
632 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
633 if (notify)
Wei Liud634bf22013-05-22 06:34:46 +0000634 notify_remote_via_irq(np->tx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700635
stephen hemmingere00f85b2011-06-21 05:35:31 +0000636 u64_stats_update_begin(&stats->syncp);
637 stats->tx_bytes += skb->len;
638 stats->tx_packets++;
639 u64_stats_update_end(&stats->syncp);
Jeremy Fitzhardinge10a273a2007-08-13 12:54:37 -0700640
641 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700642 xennet_tx_buf_gc(dev);
643
644 if (!netfront_tx_slot_available(np))
645 netif_stop_queue(dev);
646
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000647 spin_unlock_irqrestore(&np->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700648
Patrick McHardy6ed10652009-06-23 06:03:08 +0000649 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700650
651 drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700652 dev->stats.tx_dropped++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700653 dev_kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000654 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700655}
656
657static int xennet_close(struct net_device *dev)
658{
659 struct netfront_info *np = netdev_priv(dev);
660 netif_stop_queue(np->netdev);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700661 napi_disable(&np->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700662 return 0;
663}
664
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700665static void xennet_move_rx_slot(struct netfront_info *np, struct sk_buff *skb,
666 grant_ref_t ref)
667{
668 int new = xennet_rxidx(np->rx.req_prod_pvt);
669
670 BUG_ON(np->rx_skbs[new]);
671 np->rx_skbs[new] = skb;
672 np->grant_rx_ref[new] = ref;
673 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->id = new;
674 RING_GET_REQUEST(&np->rx, np->rx.req_prod_pvt)->gref = ref;
675 np->rx.req_prod_pvt++;
676}
677
678static int xennet_get_extras(struct netfront_info *np,
679 struct xen_netif_extra_info *extras,
680 RING_IDX rp)
681
682{
683 struct xen_netif_extra_info *extra;
684 struct device *dev = &np->netdev->dev;
685 RING_IDX cons = np->rx.rsp_cons;
686 int err = 0;
687
688 do {
689 struct sk_buff *skb;
690 grant_ref_t ref;
691
692 if (unlikely(cons + 1 == rp)) {
693 if (net_ratelimit())
694 dev_warn(dev, "Missing extra info\n");
695 err = -EBADR;
696 break;
697 }
698
699 extra = (struct xen_netif_extra_info *)
700 RING_GET_RESPONSE(&np->rx, ++cons);
701
702 if (unlikely(!extra->type ||
703 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
704 if (net_ratelimit())
705 dev_warn(dev, "Invalid extra type: %d\n",
706 extra->type);
707 err = -EINVAL;
708 } else {
709 memcpy(&extras[extra->type - 1], extra,
710 sizeof(*extra));
711 }
712
713 skb = xennet_get_rx_skb(np, cons);
714 ref = xennet_get_rx_ref(np, cons);
715 xennet_move_rx_slot(np, skb, ref);
716 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
717
718 np->rx.rsp_cons = cons;
719 return err;
720}
721
722static int xennet_get_responses(struct netfront_info *np,
723 struct netfront_rx_info *rinfo, RING_IDX rp,
724 struct sk_buff_head *list)
725{
726 struct xen_netif_rx_response *rx = &rinfo->rx;
727 struct xen_netif_extra_info *extras = rinfo->extras;
728 struct device *dev = &np->netdev->dev;
729 RING_IDX cons = np->rx.rsp_cons;
730 struct sk_buff *skb = xennet_get_rx_skb(np, cons);
731 grant_ref_t ref = xennet_get_rx_ref(np, cons);
732 int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
Wei Liu7158ff62013-03-25 01:08:19 +0000733 int slots = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700734 int err = 0;
735 unsigned long ret;
736
Ian Campbellf942dc22011-03-15 00:06:18 +0000737 if (rx->flags & XEN_NETRXF_extra_info) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700738 err = xennet_get_extras(np, extras, rp);
739 cons = np->rx.rsp_cons;
740 }
741
742 for (;;) {
743 if (unlikely(rx->status < 0 ||
744 rx->offset + rx->status > PAGE_SIZE)) {
745 if (net_ratelimit())
746 dev_warn(dev, "rx->offset: %x, size: %u\n",
747 rx->offset, rx->status);
748 xennet_move_rx_slot(np, skb, ref);
749 err = -EINVAL;
750 goto next;
751 }
752
753 /*
754 * This definitely indicates a bug, either in this driver or in
755 * the backend driver. In future this should flag the bad
Wei Liu697089d2013-04-22 02:20:40 +0000756 * situation to the system controller to reboot the backend.
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700757 */
758 if (ref == GRANT_INVALID_REF) {
759 if (net_ratelimit())
760 dev_warn(dev, "Bad rx response id %d.\n",
761 rx->id);
762 err = -EINVAL;
763 goto next;
764 }
765
766 ret = gnttab_end_foreign_access_ref(ref, 0);
767 BUG_ON(!ret);
768
769 gnttab_release_grant_reference(&np->gref_rx_head, ref);
770
771 __skb_queue_tail(list, skb);
772
773next:
Ian Campbellf942dc22011-03-15 00:06:18 +0000774 if (!(rx->flags & XEN_NETRXF_more_data))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700775 break;
776
Wei Liu7158ff62013-03-25 01:08:19 +0000777 if (cons + slots == rp) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700778 if (net_ratelimit())
Wei Liu7158ff62013-03-25 01:08:19 +0000779 dev_warn(dev, "Need more slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700780 err = -ENOENT;
781 break;
782 }
783
Wei Liu7158ff62013-03-25 01:08:19 +0000784 rx = RING_GET_RESPONSE(&np->rx, cons + slots);
785 skb = xennet_get_rx_skb(np, cons + slots);
786 ref = xennet_get_rx_ref(np, cons + slots);
787 slots++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700788 }
789
Wei Liu7158ff62013-03-25 01:08:19 +0000790 if (unlikely(slots > max)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700791 if (net_ratelimit())
Wei Liu697089d2013-04-22 02:20:40 +0000792 dev_warn(dev, "Too many slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700793 err = -E2BIG;
794 }
795
796 if (unlikely(err))
Wei Liu7158ff62013-03-25 01:08:19 +0000797 np->rx.rsp_cons = cons + slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700798
799 return err;
800}
801
802static int xennet_set_skb_gso(struct sk_buff *skb,
803 struct xen_netif_extra_info *gso)
804{
805 if (!gso->u.gso.size) {
806 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700807 pr_warn("GSO size must not be zero\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700808 return -EINVAL;
809 }
810
811 /* Currently only TCPv4 S.O. is supported. */
812 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
813 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700814 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700815 return -EINVAL;
816 }
817
818 skb_shinfo(skb)->gso_size = gso->u.gso.size;
819 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
820
821 /* Header must be checked, and gso_segs computed. */
822 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
823 skb_shinfo(skb)->gso_segs = 0;
824
825 return 0;
826}
827
828static RING_IDX xennet_fill_frags(struct netfront_info *np,
829 struct sk_buff *skb,
830 struct sk_buff_head *list)
831{
832 struct skb_shared_info *shinfo = skb_shinfo(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700833 RING_IDX cons = np->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700834 struct sk_buff *nskb;
835
836 while ((nskb = __skb_dequeue(list))) {
837 struct xen_netif_rx_response *rx =
838 RING_GET_RESPONSE(&np->rx, ++cons);
Ian Campbell01c68022011-10-05 00:28:47 +0000839 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700840
Jan Beulich093b9c72013-07-17 08:09:37 +0100841 if (shinfo->nr_frags == MAX_SKB_FRAGS) {
842 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700843
Jan Beulich093b9c72013-07-17 08:09:37 +0100844 BUG_ON(pull_to <= skb_headlen(skb));
845 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
846 }
847 BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
848
849 skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
850 rx->offset, rx->status, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700851
852 skb_shinfo(nskb)->nr_frags = 0;
853 kfree_skb(nskb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700854 }
855
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700856 return cons;
857}
858
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000859static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700860{
861 struct iphdr *iph;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700862 int err = -EPROTO;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000863 int recalculate_partial_csum = 0;
864
865 /*
866 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
867 * peers can fail to set NETRXF_csum_blank when sending a GSO
868 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
869 * recalculate the partial checksum.
870 */
871 if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
872 struct netfront_info *np = netdev_priv(dev);
873 np->rx_gso_checksum_fixup++;
874 skb->ip_summed = CHECKSUM_PARTIAL;
875 recalculate_partial_csum = 1;
876 }
877
878 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
879 if (skb->ip_summed != CHECKSUM_PARTIAL)
880 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700881
882 if (skb->protocol != htons(ETH_P_IP))
883 goto out;
884
885 iph = (void *)skb->data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700886
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700887 switch (iph->protocol) {
888 case IPPROTO_TCP:
Li RongQing82491522013-06-06 14:35:18 +0800889 if (!skb_partial_csum_set(skb, 4 * iph->ihl,
890 offsetof(struct tcphdr, check)))
891 goto out;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000892
893 if (recalculate_partial_csum) {
Li RongQing82491522013-06-06 14:35:18 +0800894 struct tcphdr *tcph = tcp_hdr(skb);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000895 tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
896 skb->len - iph->ihl*4,
897 IPPROTO_TCP, 0);
898 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700899 break;
900 case IPPROTO_UDP:
Li RongQing82491522013-06-06 14:35:18 +0800901 if (!skb_partial_csum_set(skb, 4 * iph->ihl,
902 offsetof(struct udphdr, check)))
903 goto out;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000904
905 if (recalculate_partial_csum) {
Li RongQing82491522013-06-06 14:35:18 +0800906 struct udphdr *udph = udp_hdr(skb);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000907 udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
908 skb->len - iph->ihl*4,
909 IPPROTO_UDP, 0);
910 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700911 break;
912 default:
913 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700914 pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n",
915 iph->protocol);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700916 goto out;
917 }
918
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700919 err = 0;
920
921out:
922 return err;
923}
924
925static int handle_incoming_queue(struct net_device *dev,
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700926 struct sk_buff_head *rxq)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700927{
stephen hemmingere00f85b2011-06-21 05:35:31 +0000928 struct netfront_info *np = netdev_priv(dev);
929 struct netfront_stats *stats = this_cpu_ptr(np->stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700930 int packets_dropped = 0;
931 struct sk_buff *skb;
932
933 while ((skb = __skb_dequeue(rxq)) != NULL) {
Ian Campbell36832432012-08-22 00:26:47 +0000934 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700935
Jan Beulich093b9c72013-07-17 08:09:37 +0100936 if (pull_to > skb_headlen(skb))
937 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700938
939 /* Ethernet work: Delayed to here as it peeks the header. */
940 skb->protocol = eth_type_trans(skb, dev);
941
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000942 if (checksum_setup(dev, skb)) {
943 kfree_skb(skb);
944 packets_dropped++;
945 dev->stats.rx_errors++;
946 continue;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700947 }
948
stephen hemmingere00f85b2011-06-21 05:35:31 +0000949 u64_stats_update_begin(&stats->syncp);
950 stats->rx_packets++;
951 stats->rx_bytes += skb->len;
952 u64_stats_update_end(&stats->syncp);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700953
954 /* Pass it up. */
Wei Liu99d3d582013-09-30 13:46:34 +0100955 napi_gro_receive(&np->napi, skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700956 }
957
958 return packets_dropped;
959}
960
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700961static int xennet_poll(struct napi_struct *napi, int budget)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700962{
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700963 struct netfront_info *np = container_of(napi, struct netfront_info, napi);
964 struct net_device *dev = np->netdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700965 struct sk_buff *skb;
966 struct netfront_rx_info rinfo;
967 struct xen_netif_rx_response *rx = &rinfo.rx;
968 struct xen_netif_extra_info *extras = rinfo.extras;
969 RING_IDX i, rp;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700970 int work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700971 struct sk_buff_head rxq;
972 struct sk_buff_head errq;
973 struct sk_buff_head tmpq;
974 unsigned long flags;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700975 int err;
976
977 spin_lock(&np->rx_lock);
978
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700979 skb_queue_head_init(&rxq);
980 skb_queue_head_init(&errq);
981 skb_queue_head_init(&tmpq);
982
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700983 rp = np->rx.sring->rsp_prod;
984 rmb(); /* Ensure we see queued responses up to 'rp'. */
985
986 i = np->rx.rsp_cons;
987 work_done = 0;
988 while ((i != rp) && (work_done < budget)) {
989 memcpy(rx, RING_GET_RESPONSE(&np->rx, i), sizeof(*rx));
990 memset(extras, 0, sizeof(rinfo.extras));
991
992 err = xennet_get_responses(np, &rinfo, rp, &tmpq);
993
994 if (unlikely(err)) {
995err:
996 while ((skb = __skb_dequeue(&tmpq)))
997 __skb_queue_tail(&errq, skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700998 dev->stats.rx_errors++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700999 i = np->rx.rsp_cons;
1000 continue;
1001 }
1002
1003 skb = __skb_dequeue(&tmpq);
1004
1005 if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
1006 struct xen_netif_extra_info *gso;
1007 gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
1008
1009 if (unlikely(xennet_set_skb_gso(skb, gso))) {
1010 __skb_queue_head(&tmpq, skb);
1011 np->rx.rsp_cons += skb_queue_len(&tmpq);
1012 goto err;
1013 }
1014 }
1015
Ian Campbell36832432012-08-22 00:26:47 +00001016 NETFRONT_SKB_CB(skb)->pull_to = rx->status;
1017 if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
1018 NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001019
Ian Campbell36832432012-08-22 00:26:47 +00001020 skb_shinfo(skb)->frags[0].page_offset = rx->offset;
1021 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1022 skb->data_len = rx->status;
Jan Beulich093b9c72013-07-17 08:09:37 +01001023 skb->len += rx->status;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001024
1025 i = xennet_fill_frags(np, skb, &tmpq);
1026
Ian Campbellf942dc22011-03-15 00:06:18 +00001027 if (rx->flags & XEN_NETRXF_csum_blank)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001028 skb->ip_summed = CHECKSUM_PARTIAL;
Ian Campbellf942dc22011-03-15 00:06:18 +00001029 else if (rx->flags & XEN_NETRXF_data_validated)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001030 skb->ip_summed = CHECKSUM_UNNECESSARY;
1031
1032 __skb_queue_tail(&rxq, skb);
1033
1034 np->rx.rsp_cons = ++i;
1035 work_done++;
1036 }
1037
Wang Chen56cfe5d2008-05-22 18:09:06 +08001038 __skb_queue_purge(&errq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001039
1040 work_done -= handle_incoming_queue(dev, &rxq);
1041
1042 /* If we get a callback with very few responses, reduce fill target. */
1043 /* NB. Note exponential increase, linear decrease. */
1044 if (((np->rx.req_prod_pvt - np->rx.sring->rsp_prod) >
1045 ((3*np->rx_target) / 4)) &&
1046 (--np->rx_target < np->rx_min_target))
1047 np->rx_target = np->rx_min_target;
1048
1049 xennet_alloc_rx_buffers(dev);
1050
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001051 if (work_done < budget) {
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001052 int more_to_do = 0;
1053
Wei Liu99d3d582013-09-30 13:46:34 +01001054 napi_gro_flush(napi, false);
1055
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001056 local_irq_save(flags);
1057
1058 RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do);
1059 if (!more_to_do)
Ben Hutchings288379f2009-01-19 16:43:59 -08001060 __napi_complete(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001061
1062 local_irq_restore(flags);
1063 }
1064
1065 spin_unlock(&np->rx_lock);
1066
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001067 return work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001068}
1069
1070static int xennet_change_mtu(struct net_device *dev, int mtu)
1071{
Wei Liu9ecd1a72013-04-22 02:20:41 +00001072 int max = xennet_can_sg(dev) ?
1073 XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001074
1075 if (mtu > max)
1076 return -EINVAL;
1077 dev->mtu = mtu;
1078 return 0;
1079}
1080
stephen hemmingere00f85b2011-06-21 05:35:31 +00001081static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
1082 struct rtnl_link_stats64 *tot)
1083{
1084 struct netfront_info *np = netdev_priv(dev);
1085 int cpu;
1086
1087 for_each_possible_cpu(cpu) {
1088 struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu);
1089 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1090 unsigned int start;
1091
1092 do {
1093 start = u64_stats_fetch_begin_bh(&stats->syncp);
1094
1095 rx_packets = stats->rx_packets;
1096 tx_packets = stats->tx_packets;
1097 rx_bytes = stats->rx_bytes;
1098 tx_bytes = stats->tx_bytes;
1099 } while (u64_stats_fetch_retry_bh(&stats->syncp, start));
1100
1101 tot->rx_packets += rx_packets;
1102 tot->tx_packets += tx_packets;
1103 tot->rx_bytes += rx_bytes;
1104 tot->tx_bytes += tx_bytes;
1105 }
1106
1107 tot->rx_errors = dev->stats.rx_errors;
1108 tot->tx_dropped = dev->stats.tx_dropped;
1109
1110 return tot;
1111}
1112
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001113static void xennet_release_tx_bufs(struct netfront_info *np)
1114{
1115 struct sk_buff *skb;
1116 int i;
1117
1118 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1119 /* Skip over entries which are actually freelist references */
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -07001120 if (skb_entry_is_link(&np->tx_skbs[i]))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001121 continue;
1122
1123 skb = np->tx_skbs[i].skb;
1124 gnttab_end_foreign_access_ref(np->grant_tx_ref[i],
1125 GNTMAP_readonly);
1126 gnttab_release_grant_reference(&np->gref_tx_head,
1127 np->grant_tx_ref[i]);
1128 np->grant_tx_ref[i] = GRANT_INVALID_REF;
1129 add_id_to_freelist(&np->tx_skb_freelist, np->tx_skbs, i);
1130 dev_kfree_skb_irq(skb);
1131 }
1132}
1133
1134static void xennet_release_rx_bufs(struct netfront_info *np)
1135{
1136 struct mmu_update *mmu = np->rx_mmu;
1137 struct multicall_entry *mcl = np->rx_mcl;
1138 struct sk_buff_head free_list;
1139 struct sk_buff *skb;
1140 unsigned long mfn;
1141 int xfer = 0, noxfer = 0, unused = 0;
1142 int id, ref;
1143
1144 dev_warn(&np->netdev->dev, "%s: fix me for copying receiver.\n",
1145 __func__);
1146 return;
1147
1148 skb_queue_head_init(&free_list);
1149
1150 spin_lock_bh(&np->rx_lock);
1151
1152 for (id = 0; id < NET_RX_RING_SIZE; id++) {
1153 ref = np->grant_rx_ref[id];
1154 if (ref == GRANT_INVALID_REF) {
1155 unused++;
1156 continue;
1157 }
1158
1159 skb = np->rx_skbs[id];
1160 mfn = gnttab_end_foreign_transfer_ref(ref);
1161 gnttab_release_grant_reference(&np->gref_rx_head, ref);
1162 np->grant_rx_ref[id] = GRANT_INVALID_REF;
1163
1164 if (0 == mfn) {
1165 skb_shinfo(skb)->nr_frags = 0;
1166 dev_kfree_skb(skb);
1167 noxfer++;
1168 continue;
1169 }
1170
1171 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
1172 /* Remap the page. */
Ian Campbell01c68022011-10-05 00:28:47 +00001173 const struct page *page =
1174 skb_frag_page(&skb_shinfo(skb)->frags[0]);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001175 unsigned long pfn = page_to_pfn(page);
1176 void *vaddr = page_address(page);
1177
1178 MULTI_update_va_mapping(mcl, (unsigned long)vaddr,
1179 mfn_pte(mfn, PAGE_KERNEL),
1180 0);
1181 mcl++;
1182 mmu->ptr = ((u64)mfn << PAGE_SHIFT)
1183 | MMU_MACHPHYS_UPDATE;
1184 mmu->val = pfn;
1185 mmu++;
1186
1187 set_phys_to_machine(pfn, mfn);
1188 }
1189 __skb_queue_tail(&free_list, skb);
1190 xfer++;
1191 }
1192
1193 dev_info(&np->netdev->dev, "%s: %d xfer, %d noxfer, %d unused\n",
1194 __func__, xfer, noxfer, unused);
1195
1196 if (xfer) {
1197 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
1198 /* Do all the remapping work and M2P updates. */
1199 MULTI_mmu_update(mcl, np->rx_mmu, mmu - np->rx_mmu,
Al Viro79ea13c2008-01-24 02:06:46 -08001200 NULL, DOMID_SELF);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001201 mcl++;
1202 HYPERVISOR_multicall(np->rx_mcl, mcl - np->rx_mcl);
1203 }
1204 }
1205
Wang Chen56cfe5d2008-05-22 18:09:06 +08001206 __skb_queue_purge(&free_list);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001207
1208 spin_unlock_bh(&np->rx_lock);
1209}
1210
1211static void xennet_uninit(struct net_device *dev)
1212{
1213 struct netfront_info *np = netdev_priv(dev);
1214 xennet_release_tx_bufs(np);
1215 xennet_release_rx_bufs(np);
1216 gnttab_free_grant_references(np->gref_tx_head);
1217 gnttab_free_grant_references(np->gref_rx_head);
1218}
1219
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001220static netdev_features_t xennet_fix_features(struct net_device *dev,
1221 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001222{
1223 struct netfront_info *np = netdev_priv(dev);
1224 int val;
1225
1226 if (features & NETIF_F_SG) {
1227 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
1228 "%d", &val) < 0)
1229 val = 0;
1230
1231 if (!val)
1232 features &= ~NETIF_F_SG;
1233 }
1234
1235 if (features & NETIF_F_TSO) {
1236 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1237 "feature-gso-tcpv4", "%d", &val) < 0)
1238 val = 0;
1239
1240 if (!val)
1241 features &= ~NETIF_F_TSO;
1242 }
1243
1244 return features;
1245}
1246
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001247static int xennet_set_features(struct net_device *dev,
1248 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001249{
1250 if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
1251 netdev_info(dev, "Reducing MTU because no SG offload");
1252 dev->mtu = ETH_DATA_LEN;
1253 }
1254
1255 return 0;
1256}
1257
Wei Liud634bf22013-05-22 06:34:46 +00001258static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001259{
Wei Liud634bf22013-05-22 06:34:46 +00001260 struct netfront_info *np = dev_id;
1261 struct net_device *dev = np->netdev;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001262 unsigned long flags;
1263
1264 spin_lock_irqsave(&np->tx_lock, flags);
Wei Liud634bf22013-05-22 06:34:46 +00001265 xennet_tx_buf_gc(dev);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001266 spin_unlock_irqrestore(&np->tx_lock, flags);
1267
1268 return IRQ_HANDLED;
1269}
1270
Wei Liud634bf22013-05-22 06:34:46 +00001271static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1272{
1273 struct netfront_info *np = dev_id;
1274 struct net_device *dev = np->netdev;
1275
1276 if (likely(netif_carrier_ok(dev) &&
1277 RING_HAS_UNCONSUMED_RESPONSES(&np->rx)))
1278 napi_schedule(&np->napi);
1279
1280 return IRQ_HANDLED;
1281}
1282
1283static irqreturn_t xennet_interrupt(int irq, void *dev_id)
1284{
1285 xennet_tx_interrupt(irq, dev_id);
1286 xennet_rx_interrupt(irq, dev_id);
1287 return IRQ_HANDLED;
1288}
1289
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001290#ifdef CONFIG_NET_POLL_CONTROLLER
1291static void xennet_poll_controller(struct net_device *dev)
1292{
1293 xennet_interrupt(0, dev);
1294}
1295#endif
1296
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001297static const struct net_device_ops xennet_netdev_ops = {
1298 .ndo_open = xennet_open,
1299 .ndo_uninit = xennet_uninit,
1300 .ndo_stop = xennet_close,
1301 .ndo_start_xmit = xennet_start_xmit,
1302 .ndo_change_mtu = xennet_change_mtu,
stephen hemmingere00f85b2011-06-21 05:35:31 +00001303 .ndo_get_stats64 = xennet_get_stats64,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001304 .ndo_set_mac_address = eth_mac_addr,
1305 .ndo_validate_addr = eth_validate_addr,
Michał Mirosławfb507932011-03-31 01:01:35 +00001306 .ndo_fix_features = xennet_fix_features,
1307 .ndo_set_features = xennet_set_features,
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001308#ifdef CONFIG_NET_POLL_CONTROLLER
1309 .ndo_poll_controller = xennet_poll_controller,
1310#endif
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001311};
1312
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001313static struct net_device *xennet_create_dev(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001314{
1315 int i, err;
1316 struct net_device *netdev;
1317 struct netfront_info *np;
1318
1319 netdev = alloc_etherdev(sizeof(struct netfront_info));
Joe Perches41de8d42012-01-29 13:47:52 +00001320 if (!netdev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001321 return ERR_PTR(-ENOMEM);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001322
1323 np = netdev_priv(netdev);
1324 np->xbdev = dev;
1325
1326 spin_lock_init(&np->tx_lock);
1327 spin_lock_init(&np->rx_lock);
1328
1329 skb_queue_head_init(&np->rx_batch);
1330 np->rx_target = RX_DFL_MIN_TARGET;
1331 np->rx_min_target = RX_DFL_MIN_TARGET;
1332 np->rx_max_target = RX_MAX_TARGET;
1333
1334 init_timer(&np->rx_refill_timer);
1335 np->rx_refill_timer.data = (unsigned long)netdev;
1336 np->rx_refill_timer.function = rx_refill_timeout;
1337
stephen hemmingere00f85b2011-06-21 05:35:31 +00001338 err = -ENOMEM;
1339 np->stats = alloc_percpu(struct netfront_stats);
1340 if (np->stats == NULL)
1341 goto exit;
1342
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001343 /* Initialise tx_skbs as a free chain containing every entry. */
1344 np->tx_skb_freelist = 0;
1345 for (i = 0; i < NET_TX_RING_SIZE; i++) {
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -07001346 skb_entry_set_link(&np->tx_skbs[i], i+1);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001347 np->grant_tx_ref[i] = GRANT_INVALID_REF;
1348 }
1349
1350 /* Clear out rx_skbs */
1351 for (i = 0; i < NET_RX_RING_SIZE; i++) {
1352 np->rx_skbs[i] = NULL;
1353 np->grant_rx_ref[i] = GRANT_INVALID_REF;
1354 }
1355
1356 /* A grant for every tx ring slot */
1357 if (gnttab_alloc_grant_references(TX_MAX_TARGET,
1358 &np->gref_tx_head) < 0) {
Joe Perches383eda32013-06-27 21:57:49 -07001359 pr_alert("can't alloc tx grant refs\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001360 err = -ENOMEM;
stephen hemmingere00f85b2011-06-21 05:35:31 +00001361 goto exit_free_stats;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001362 }
1363 /* A grant for every rx ring slot */
1364 if (gnttab_alloc_grant_references(RX_MAX_TARGET,
1365 &np->gref_rx_head) < 0) {
Joe Perches383eda32013-06-27 21:57:49 -07001366 pr_alert("can't alloc rx grant refs\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001367 err = -ENOMEM;
1368 goto exit_free_tx;
1369 }
1370
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001371 netdev->netdev_ops = &xennet_netdev_ops;
1372
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001373 netif_napi_add(netdev, &np->napi, xennet_poll, 64);
Michał Mirosławfb507932011-03-31 01:01:35 +00001374 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1375 NETIF_F_GSO_ROBUST;
1376 netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001377
Ian Campbellfc3e5942011-04-04 11:07:57 -07001378 /*
1379 * Assume that all hw features are available for now. This set
1380 * will be adjusted by the call to netdev_update_features() in
1381 * xennet_connect() which is the earliest point where we can
1382 * negotiate with the backend regarding supported features.
1383 */
1384 netdev->features |= netdev->hw_features;
1385
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001386 SET_ETHTOOL_OPS(netdev, &xennet_ethtool_ops);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001387 SET_NETDEV_DEV(netdev, &dev->dev);
1388
Wei Liu9ecd1a72013-04-22 02:20:41 +00001389 netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER);
1390
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001391 np->netdev = netdev;
1392
1393 netif_carrier_off(netdev);
1394
1395 return netdev;
1396
1397 exit_free_tx:
1398 gnttab_free_grant_references(np->gref_tx_head);
stephen hemmingere00f85b2011-06-21 05:35:31 +00001399 exit_free_stats:
1400 free_percpu(np->stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001401 exit:
1402 free_netdev(netdev);
1403 return ERR_PTR(err);
1404}
1405
1406/**
1407 * Entry point to this code when a new device is created. Allocate the basic
1408 * structures and the ring buffers for communication with the backend, and
1409 * inform the backend of the appropriate details for those.
1410 */
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001411static int netfront_probe(struct xenbus_device *dev,
Greg Kroah-Hartman1dd06ae2012-12-06 14:30:56 +00001412 const struct xenbus_device_id *id)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001413{
1414 int err;
1415 struct net_device *netdev;
1416 struct netfront_info *info;
1417
1418 netdev = xennet_create_dev(dev);
1419 if (IS_ERR(netdev)) {
1420 err = PTR_ERR(netdev);
1421 xenbus_dev_fatal(dev, err, "creating netdev");
1422 return err;
1423 }
1424
1425 info = netdev_priv(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001426 dev_set_drvdata(&dev->dev, info);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001427
1428 err = register_netdev(info->netdev);
1429 if (err) {
Joe Perches383eda32013-06-27 21:57:49 -07001430 pr_warn("%s: register_netdev err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001431 goto fail;
1432 }
1433
1434 err = xennet_sysfs_addif(info->netdev);
1435 if (err) {
1436 unregister_netdev(info->netdev);
Joe Perches383eda32013-06-27 21:57:49 -07001437 pr_warn("%s: add sysfs failed err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001438 goto fail;
1439 }
1440
1441 return 0;
1442
1443 fail:
1444 free_netdev(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001445 dev_set_drvdata(&dev->dev, NULL);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001446 return err;
1447}
1448
1449static void xennet_end_access(int ref, void *page)
1450{
1451 /* This frees the page as a side-effect */
1452 if (ref != GRANT_INVALID_REF)
1453 gnttab_end_foreign_access(ref, 0, (unsigned long)page);
1454}
1455
1456static void xennet_disconnect_backend(struct netfront_info *info)
1457{
1458 /* Stop old i/f to prevent errors whilst we rebuild the state. */
1459 spin_lock_bh(&info->rx_lock);
1460 spin_lock_irq(&info->tx_lock);
1461 netif_carrier_off(info->netdev);
1462 spin_unlock_irq(&info->tx_lock);
1463 spin_unlock_bh(&info->rx_lock);
1464
Wei Liud634bf22013-05-22 06:34:46 +00001465 if (info->tx_irq && (info->tx_irq == info->rx_irq))
1466 unbind_from_irqhandler(info->tx_irq, info);
1467 if (info->tx_irq && (info->tx_irq != info->rx_irq)) {
1468 unbind_from_irqhandler(info->tx_irq, info);
1469 unbind_from_irqhandler(info->rx_irq, info);
1470 }
1471 info->tx_evtchn = info->rx_evtchn = 0;
1472 info->tx_irq = info->rx_irq = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001473
1474 /* End access and free the pages */
1475 xennet_end_access(info->tx_ring_ref, info->tx.sring);
1476 xennet_end_access(info->rx_ring_ref, info->rx.sring);
1477
1478 info->tx_ring_ref = GRANT_INVALID_REF;
1479 info->rx_ring_ref = GRANT_INVALID_REF;
1480 info->tx.sring = NULL;
1481 info->rx.sring = NULL;
1482}
1483
1484/**
1485 * We are reconnecting to the backend, due to a suspend/resume, or a backend
1486 * driver restart. We tear down our netif structure and recreate it, but
1487 * leave the device-layer structures intact so that this is transparent to the
1488 * rest of the kernel.
1489 */
1490static int netfront_resume(struct xenbus_device *dev)
1491{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001492 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001493
1494 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1495
1496 xennet_disconnect_backend(info);
1497 return 0;
1498}
1499
1500static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
1501{
1502 char *s, *e, *macstr;
1503 int i;
1504
1505 macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
1506 if (IS_ERR(macstr))
1507 return PTR_ERR(macstr);
1508
1509 for (i = 0; i < ETH_ALEN; i++) {
1510 mac[i] = simple_strtoul(s, &e, 16);
1511 if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
1512 kfree(macstr);
1513 return -ENOENT;
1514 }
1515 s = e+1;
1516 }
1517
1518 kfree(macstr);
1519 return 0;
1520}
1521
Wei Liud634bf22013-05-22 06:34:46 +00001522static int setup_netfront_single(struct netfront_info *info)
1523{
1524 int err;
1525
1526 err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
1527 if (err < 0)
1528 goto fail;
1529
1530 err = bind_evtchn_to_irqhandler(info->tx_evtchn,
1531 xennet_interrupt,
1532 0, info->netdev->name, info);
1533 if (err < 0)
1534 goto bind_fail;
1535 info->rx_evtchn = info->tx_evtchn;
1536 info->rx_irq = info->tx_irq = err;
1537
1538 return 0;
1539
1540bind_fail:
1541 xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
1542 info->tx_evtchn = 0;
1543fail:
1544 return err;
1545}
1546
1547static int setup_netfront_split(struct netfront_info *info)
1548{
1549 int err;
1550
1551 err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
1552 if (err < 0)
1553 goto fail;
1554 err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn);
1555 if (err < 0)
1556 goto alloc_rx_evtchn_fail;
1557
1558 snprintf(info->tx_irq_name, sizeof(info->tx_irq_name),
1559 "%s-tx", info->netdev->name);
1560 err = bind_evtchn_to_irqhandler(info->tx_evtchn,
1561 xennet_tx_interrupt,
1562 0, info->tx_irq_name, info);
1563 if (err < 0)
1564 goto bind_tx_fail;
1565 info->tx_irq = err;
1566
1567 snprintf(info->rx_irq_name, sizeof(info->rx_irq_name),
1568 "%s-rx", info->netdev->name);
1569 err = bind_evtchn_to_irqhandler(info->rx_evtchn,
1570 xennet_rx_interrupt,
1571 0, info->rx_irq_name, info);
1572 if (err < 0)
1573 goto bind_rx_fail;
1574 info->rx_irq = err;
1575
1576 return 0;
1577
1578bind_rx_fail:
1579 unbind_from_irqhandler(info->tx_irq, info);
1580 info->tx_irq = 0;
1581bind_tx_fail:
1582 xenbus_free_evtchn(info->xbdev, info->rx_evtchn);
1583 info->rx_evtchn = 0;
1584alloc_rx_evtchn_fail:
1585 xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
1586 info->tx_evtchn = 0;
1587fail:
1588 return err;
1589}
1590
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001591static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
1592{
1593 struct xen_netif_tx_sring *txs;
1594 struct xen_netif_rx_sring *rxs;
1595 int err;
1596 struct net_device *netdev = info->netdev;
Wei Liud634bf22013-05-22 06:34:46 +00001597 unsigned int feature_split_evtchn;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001598
1599 info->tx_ring_ref = GRANT_INVALID_REF;
1600 info->rx_ring_ref = GRANT_INVALID_REF;
1601 info->rx.sring = NULL;
1602 info->tx.sring = NULL;
1603 netdev->irq = 0;
1604
Wei Liud634bf22013-05-22 06:34:46 +00001605 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1606 "feature-split-event-channels", "%u",
1607 &feature_split_evtchn);
1608 if (err < 0)
1609 feature_split_evtchn = 0;
1610
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001611 err = xen_net_read_mac(dev, netdev->dev_addr);
1612 if (err) {
1613 xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
1614 goto fail;
1615 }
1616
Ian Campbella144ff02008-06-17 10:47:08 +02001617 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001618 if (!txs) {
1619 err = -ENOMEM;
1620 xenbus_dev_fatal(dev, err, "allocating tx ring page");
1621 goto fail;
1622 }
1623 SHARED_RING_INIT(txs);
1624 FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
1625
1626 err = xenbus_grant_ring(dev, virt_to_mfn(txs));
Wei Liu1ca29832013-05-20 01:05:12 +00001627 if (err < 0)
1628 goto grant_tx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001629
1630 info->tx_ring_ref = err;
Ian Campbella144ff02008-06-17 10:47:08 +02001631 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001632 if (!rxs) {
1633 err = -ENOMEM;
1634 xenbus_dev_fatal(dev, err, "allocating rx ring page");
Wei Liu1ca29832013-05-20 01:05:12 +00001635 goto alloc_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001636 }
1637 SHARED_RING_INIT(rxs);
1638 FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
1639
1640 err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
Wei Liu1ca29832013-05-20 01:05:12 +00001641 if (err < 0)
1642 goto grant_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001643 info->rx_ring_ref = err;
1644
Wei Liud634bf22013-05-22 06:34:46 +00001645 if (feature_split_evtchn)
1646 err = setup_netfront_split(info);
1647 /* setup single event channel if
1648 * a) feature-split-event-channels == 0
1649 * b) feature-split-event-channels == 1 but failed to setup
1650 */
1651 if (!feature_split_evtchn || (feature_split_evtchn && err))
1652 err = setup_netfront_single(info);
1653
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001654 if (err)
Wei Liu1ca29832013-05-20 01:05:12 +00001655 goto alloc_evtchn_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001656
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001657 return 0;
1658
Wei Liu1ca29832013-05-20 01:05:12 +00001659 /* If we fail to setup netfront, it is safe to just revoke access to
1660 * granted pages because backend is not accessing it at this point.
1661 */
Wei Liu1ca29832013-05-20 01:05:12 +00001662alloc_evtchn_fail:
1663 gnttab_end_foreign_access_ref(info->rx_ring_ref, 0);
1664grant_rx_ring_fail:
1665 free_page((unsigned long)rxs);
1666alloc_rx_ring_fail:
1667 gnttab_end_foreign_access_ref(info->tx_ring_ref, 0);
1668grant_tx_ring_fail:
1669 free_page((unsigned long)txs);
1670fail:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001671 return err;
1672}
1673
1674/* Common code used when first setting up, and when resuming. */
Ian Campbellf502bf22010-08-18 23:27:49 +00001675static int talk_to_netback(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001676 struct netfront_info *info)
1677{
1678 const char *message;
1679 struct xenbus_transaction xbt;
1680 int err;
1681
1682 /* Create shared ring, alloc event channel. */
1683 err = setup_netfront(dev, info);
1684 if (err)
1685 goto out;
1686
1687again:
1688 err = xenbus_transaction_start(&xbt);
1689 if (err) {
1690 xenbus_dev_fatal(dev, err, "starting transaction");
1691 goto destroy_ring;
1692 }
1693
1694 err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref", "%u",
1695 info->tx_ring_ref);
1696 if (err) {
1697 message = "writing tx ring-ref";
1698 goto abort_transaction;
1699 }
1700 err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref", "%u",
1701 info->rx_ring_ref);
1702 if (err) {
1703 message = "writing rx ring-ref";
1704 goto abort_transaction;
1705 }
Wei Liud634bf22013-05-22 06:34:46 +00001706
1707 if (info->tx_evtchn == info->rx_evtchn) {
1708 err = xenbus_printf(xbt, dev->nodename,
1709 "event-channel", "%u", info->tx_evtchn);
1710 if (err) {
1711 message = "writing event-channel";
1712 goto abort_transaction;
1713 }
1714 } else {
1715 err = xenbus_printf(xbt, dev->nodename,
1716 "event-channel-tx", "%u", info->tx_evtchn);
1717 if (err) {
1718 message = "writing event-channel-tx";
1719 goto abort_transaction;
1720 }
1721 err = xenbus_printf(xbt, dev->nodename,
1722 "event-channel-rx", "%u", info->rx_evtchn);
1723 if (err) {
1724 message = "writing event-channel-rx";
1725 goto abort_transaction;
1726 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001727 }
1728
1729 err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
1730 1);
1731 if (err) {
1732 message = "writing request-rx-copy";
1733 goto abort_transaction;
1734 }
1735
1736 err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
1737 if (err) {
1738 message = "writing feature-rx-notify";
1739 goto abort_transaction;
1740 }
1741
1742 err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
1743 if (err) {
1744 message = "writing feature-sg";
1745 goto abort_transaction;
1746 }
1747
1748 err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
1749 if (err) {
1750 message = "writing feature-gso-tcpv4";
1751 goto abort_transaction;
1752 }
1753
1754 err = xenbus_transaction_end(xbt, 0);
1755 if (err) {
1756 if (err == -EAGAIN)
1757 goto again;
1758 xenbus_dev_fatal(dev, err, "completing transaction");
1759 goto destroy_ring;
1760 }
1761
1762 return 0;
1763
1764 abort_transaction:
1765 xenbus_transaction_end(xbt, 1);
1766 xenbus_dev_fatal(dev, err, "%s", message);
1767 destroy_ring:
1768 xennet_disconnect_backend(info);
1769 out:
1770 return err;
1771}
1772
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001773static int xennet_connect(struct net_device *dev)
1774{
1775 struct netfront_info *np = netdev_priv(dev);
1776 int i, requeue_idx, err;
1777 struct sk_buff *skb;
1778 grant_ref_t ref;
1779 struct xen_netif_rx_request *req;
1780 unsigned int feature_rx_copy;
1781
1782 err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1783 "feature-rx-copy", "%u", &feature_rx_copy);
1784 if (err != 1)
1785 feature_rx_copy = 0;
1786
1787 if (!feature_rx_copy) {
1788 dev_info(&dev->dev,
Joe Perches898eb712007-10-18 03:06:30 -07001789 "backend does not support copying receive path\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001790 return -ENODEV;
1791 }
1792
Ian Campbellf502bf22010-08-18 23:27:49 +00001793 err = talk_to_netback(np->xbdev, np);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001794 if (err)
1795 return err;
1796
Ian Campbell1ba37c52011-05-24 21:56:02 +00001797 rtnl_lock();
Michał Mirosławfb507932011-03-31 01:01:35 +00001798 netdev_update_features(dev);
Ian Campbell1ba37c52011-05-24 21:56:02 +00001799 rtnl_unlock();
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001800
1801 spin_lock_bh(&np->rx_lock);
1802 spin_lock_irq(&np->tx_lock);
1803
1804 /* Step 1: Discard all pending TX packet fragments. */
1805 xennet_release_tx_bufs(np);
1806
1807 /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
1808 for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
Ian Campbell01c68022011-10-05 00:28:47 +00001809 skb_frag_t *frag;
1810 const struct page *page;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001811 if (!np->rx_skbs[i])
1812 continue;
1813
1814 skb = np->rx_skbs[requeue_idx] = xennet_get_rx_skb(np, i);
1815 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
1816 req = RING_GET_REQUEST(&np->rx, requeue_idx);
1817
Ian Campbell01c68022011-10-05 00:28:47 +00001818 frag = &skb_shinfo(skb)->frags[0];
1819 page = skb_frag_page(frag);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001820 gnttab_grant_foreign_access_ref(
1821 ref, np->xbdev->otherend_id,
Ian Campbell01c68022011-10-05 00:28:47 +00001822 pfn_to_mfn(page_to_pfn(page)),
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001823 0);
1824 req->gref = ref;
1825 req->id = requeue_idx;
1826
1827 requeue_idx++;
1828 }
1829
1830 np->rx.req_prod_pvt = requeue_idx;
1831
1832 /*
1833 * Step 3: All public and private state should now be sane. Get
1834 * ready to start sending and receiving packets and give the driver
1835 * domain a kick because we've probably just requeued some
1836 * packets.
1837 */
1838 netif_carrier_on(np->netdev);
Wei Liud634bf22013-05-22 06:34:46 +00001839 notify_remote_via_irq(np->tx_irq);
1840 if (np->tx_irq != np->rx_irq)
1841 notify_remote_via_irq(np->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001842 xennet_tx_buf_gc(dev);
1843 xennet_alloc_rx_buffers(dev);
1844
1845 spin_unlock_irq(&np->tx_lock);
1846 spin_unlock_bh(&np->rx_lock);
1847
1848 return 0;
1849}
1850
1851/**
1852 * Callback received when the backend's state changes.
1853 */
Ian Campbellf502bf22010-08-18 23:27:49 +00001854static void netback_changed(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001855 enum xenbus_state backend_state)
1856{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001857 struct netfront_info *np = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001858 struct net_device *netdev = np->netdev;
1859
1860 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
1861
1862 switch (backend_state) {
1863 case XenbusStateInitialising:
1864 case XenbusStateInitialised:
Noboru Iwamatsub78c9512009-10-13 17:22:29 -04001865 case XenbusStateReconfiguring:
1866 case XenbusStateReconfigured:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001867 case XenbusStateUnknown:
1868 case XenbusStateClosed:
1869 break;
1870
1871 case XenbusStateInitWait:
1872 if (dev->state != XenbusStateInitialising)
1873 break;
1874 if (xennet_connect(netdev) != 0)
1875 break;
1876 xenbus_switch_state(dev, XenbusStateConnected);
Laszlo Ersek08e34eb2011-12-11 01:48:59 +00001877 break;
1878
1879 case XenbusStateConnected:
Amerigo Wangee89bab2012-08-09 22:14:56 +00001880 netdev_notify_peers(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001881 break;
1882
1883 case XenbusStateClosing:
1884 xenbus_frontend_closed(dev);
1885 break;
1886 }
1887}
1888
Ian Campbelle0ce4af2011-01-27 04:14:03 +00001889static const struct xennet_stat {
1890 char name[ETH_GSTRING_LEN];
1891 u16 offset;
1892} xennet_stats[] = {
1893 {
1894 "rx_gso_checksum_fixup",
1895 offsetof(struct netfront_info, rx_gso_checksum_fixup)
1896 },
1897};
1898
1899static int xennet_get_sset_count(struct net_device *dev, int string_set)
1900{
1901 switch (string_set) {
1902 case ETH_SS_STATS:
1903 return ARRAY_SIZE(xennet_stats);
1904 default:
1905 return -EINVAL;
1906 }
1907}
1908
1909static void xennet_get_ethtool_stats(struct net_device *dev,
1910 struct ethtool_stats *stats, u64 * data)
1911{
1912 void *np = netdev_priv(dev);
1913 int i;
1914
1915 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
Eric Dumazet48f26d52011-03-14 21:05:40 -07001916 data[i] = *(unsigned long *)(np + xennet_stats[i].offset);
Ian Campbelle0ce4af2011-01-27 04:14:03 +00001917}
1918
1919static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
1920{
1921 int i;
1922
1923 switch (stringset) {
1924 case ETH_SS_STATS:
1925 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
1926 memcpy(data + i * ETH_GSTRING_LEN,
1927 xennet_stats[i].name, ETH_GSTRING_LEN);
1928 break;
1929 }
1930}
1931
Stephen Hemminger0fc0b732009-09-02 01:03:33 -07001932static const struct ethtool_ops xennet_ethtool_ops =
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001933{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001934 .get_link = ethtool_op_get_link,
Ian Campbelle0ce4af2011-01-27 04:14:03 +00001935
1936 .get_sset_count = xennet_get_sset_count,
1937 .get_ethtool_stats = xennet_get_ethtool_stats,
1938 .get_strings = xennet_get_strings,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001939};
1940
1941#ifdef CONFIG_SYSFS
1942static ssize_t show_rxbuf_min(struct device *dev,
1943 struct device_attribute *attr, char *buf)
1944{
1945 struct net_device *netdev = to_net_dev(dev);
1946 struct netfront_info *info = netdev_priv(netdev);
1947
1948 return sprintf(buf, "%u\n", info->rx_min_target);
1949}
1950
1951static ssize_t store_rxbuf_min(struct device *dev,
1952 struct device_attribute *attr,
1953 const char *buf, size_t len)
1954{
1955 struct net_device *netdev = to_net_dev(dev);
1956 struct netfront_info *np = netdev_priv(netdev);
1957 char *endp;
1958 unsigned long target;
1959
1960 if (!capable(CAP_NET_ADMIN))
1961 return -EPERM;
1962
1963 target = simple_strtoul(buf, &endp, 0);
1964 if (endp == buf)
1965 return -EBADMSG;
1966
1967 if (target < RX_MIN_TARGET)
1968 target = RX_MIN_TARGET;
1969 if (target > RX_MAX_TARGET)
1970 target = RX_MAX_TARGET;
1971
1972 spin_lock_bh(&np->rx_lock);
1973 if (target > np->rx_max_target)
1974 np->rx_max_target = target;
1975 np->rx_min_target = target;
1976 if (target > np->rx_target)
1977 np->rx_target = target;
1978
1979 xennet_alloc_rx_buffers(netdev);
1980
1981 spin_unlock_bh(&np->rx_lock);
1982 return len;
1983}
1984
1985static ssize_t show_rxbuf_max(struct device *dev,
1986 struct device_attribute *attr, char *buf)
1987{
1988 struct net_device *netdev = to_net_dev(dev);
1989 struct netfront_info *info = netdev_priv(netdev);
1990
1991 return sprintf(buf, "%u\n", info->rx_max_target);
1992}
1993
1994static ssize_t store_rxbuf_max(struct device *dev,
1995 struct device_attribute *attr,
1996 const char *buf, size_t len)
1997{
1998 struct net_device *netdev = to_net_dev(dev);
1999 struct netfront_info *np = netdev_priv(netdev);
2000 char *endp;
2001 unsigned long target;
2002
2003 if (!capable(CAP_NET_ADMIN))
2004 return -EPERM;
2005
2006 target = simple_strtoul(buf, &endp, 0);
2007 if (endp == buf)
2008 return -EBADMSG;
2009
2010 if (target < RX_MIN_TARGET)
2011 target = RX_MIN_TARGET;
2012 if (target > RX_MAX_TARGET)
2013 target = RX_MAX_TARGET;
2014
2015 spin_lock_bh(&np->rx_lock);
2016 if (target < np->rx_min_target)
2017 np->rx_min_target = target;
2018 np->rx_max_target = target;
2019 if (target < np->rx_target)
2020 np->rx_target = target;
2021
2022 xennet_alloc_rx_buffers(netdev);
2023
2024 spin_unlock_bh(&np->rx_lock);
2025 return len;
2026}
2027
2028static ssize_t show_rxbuf_cur(struct device *dev,
2029 struct device_attribute *attr, char *buf)
2030{
2031 struct net_device *netdev = to_net_dev(dev);
2032 struct netfront_info *info = netdev_priv(netdev);
2033
2034 return sprintf(buf, "%u\n", info->rx_target);
2035}
2036
2037static struct device_attribute xennet_attrs[] = {
2038 __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf_min, store_rxbuf_min),
2039 __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf_max, store_rxbuf_max),
2040 __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf_cur, NULL),
2041};
2042
2043static int xennet_sysfs_addif(struct net_device *netdev)
2044{
2045 int i;
2046 int err;
2047
2048 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) {
2049 err = device_create_file(&netdev->dev,
2050 &xennet_attrs[i]);
2051 if (err)
2052 goto fail;
2053 }
2054 return 0;
2055
2056 fail:
2057 while (--i >= 0)
2058 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2059 return err;
2060}
2061
2062static void xennet_sysfs_delif(struct net_device *netdev)
2063{
2064 int i;
2065
2066 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++)
2067 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2068}
2069
2070#endif /* CONFIG_SYSFS */
2071
Jan Beulich73db1442011-12-22 09:08:13 +00002072static const struct xenbus_device_id netfront_ids[] = {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002073 { "vif" },
2074 { "" }
2075};
2076
2077
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002078static int xennet_remove(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002079{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002080 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002081
2082 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2083
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002084 xennet_disconnect_backend(info);
2085
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002086 xennet_sysfs_delif(info->netdev);
2087
Ian Campbell6bc96d02012-06-25 22:48:41 +00002088 unregister_netdev(info->netdev);
2089
2090 del_timer_sync(&info->rx_refill_timer);
2091
stephen hemmingere00f85b2011-06-21 05:35:31 +00002092 free_percpu(info->stats);
2093
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002094 free_netdev(info->netdev);
2095
2096 return 0;
2097}
2098
Jan Beulich73db1442011-12-22 09:08:13 +00002099static DEFINE_XENBUS_DRIVER(netfront, ,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002100 .probe = netfront_probe,
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002101 .remove = xennet_remove,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002102 .resume = netfront_resume,
Ian Campbellf502bf22010-08-18 23:27:49 +00002103 .otherend_changed = netback_changed,
Jan Beulich73db1442011-12-22 09:08:13 +00002104);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002105
2106static int __init netif_init(void)
2107{
Jeremy Fitzhardinge6e833582008-08-19 13:16:17 -07002108 if (!xen_domain())
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002109 return -ENODEV;
2110
Igor Mammedove95ae5a2012-03-27 19:31:08 +02002111 if (xen_hvm_domain() && !xen_platform_pci_unplug)
Igor Mammedovb9136d22012-03-21 15:08:38 +01002112 return -ENODEV;
2113
Joe Perches383eda32013-06-27 21:57:49 -07002114 pr_info("Initialising Xen virtual ethernet driver\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002115
Al Viroffb78a22008-11-22 17:38:14 +00002116 return xenbus_register_frontend(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002117}
2118module_init(netif_init);
2119
2120
2121static void __exit netif_exit(void)
2122{
Al Viroffb78a22008-11-22 17:38:14 +00002123 xenbus_unregister_driver(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002124}
2125module_exit(netif_exit);
2126
2127MODULE_DESCRIPTION("Xen virtual network device frontend");
2128MODULE_LICENSE("GPL");
Mark McLoughlind2f0c522008-04-02 10:54:05 -07002129MODULE_ALIAS("xen:vif");
Mark McLoughlin4f93f09b2008-04-02 10:54:06 -07002130MODULE_ALIAS("xennet");