blob: 2f0a9ce9ff737656798fc146ba995d46fe669231 [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
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +010060/* Module parameters */
61static unsigned int xennet_max_queues;
62module_param_named(max_queues, xennet_max_queues, uint, 0644);
63MODULE_PARM_DESC(max_queues,
64 "Maximum number of queues per virtual interface");
65
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070066static const struct ethtool_ops xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070067
68struct netfront_cb {
Ian Campbell36832432012-08-22 00:26:47 +000069 int pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070070};
71
72#define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb))
73
74#define RX_COPY_THRESHOLD 256
75
76#define GRANT_INVALID_REF 0
77
Jeremy Fitzhardinge667c78af2010-12-08 12:39:12 -080078#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
79#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
David Vrabel1f3c2eb2014-10-22 11:17:06 +010080
81/* Minimum number of Rx slots (includes slot for GSO metadata). */
82#define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070083
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010084/* Queue name is interface name with "-qNNN" appended */
85#define QUEUE_NAME_SIZE (IFNAMSIZ + 6)
86
87/* IRQ name is queue name with "-tx" or "-rx" appended */
88#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
89
stephen hemmingere00f85b2011-06-21 05:35:31 +000090struct netfront_stats {
91 u64 rx_packets;
92 u64 tx_packets;
93 u64 rx_bytes;
94 u64 tx_bytes;
95 struct u64_stats_sync syncp;
96};
97
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010098struct netfront_info;
99
100struct netfront_queue {
101 unsigned int id; /* Queue ID, 0-based */
102 char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
103 struct netfront_info *info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700104
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700105 struct napi_struct napi;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700106
Wei Liud634bf22013-05-22 06:34:46 +0000107 /* Split event channels support, tx_* == rx_* when using
108 * single event channel.
109 */
110 unsigned int tx_evtchn, rx_evtchn;
111 unsigned int tx_irq, rx_irq;
112 /* Only used when split event channels support is enabled */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100113 char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
114 char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700115
116 spinlock_t tx_lock;
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700117 struct xen_netif_tx_front_ring tx;
118 int tx_ring_ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700119
120 /*
121 * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
122 * are linked from tx_skb_freelist through skb_entry.link.
123 *
124 * NB. Freelist index entries are always going to be less than
125 * PAGE_OFFSET, whereas pointers to skbs will always be equal or
126 * greater than PAGE_OFFSET: we use this property to distinguish
127 * them.
128 */
129 union skb_entry {
130 struct sk_buff *skb;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700131 unsigned long link;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700132 } tx_skbs[NET_TX_RING_SIZE];
133 grant_ref_t gref_tx_head;
134 grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
Annie Licefe0072014-01-28 11:35:42 +0800135 struct page *grant_tx_page[NET_TX_RING_SIZE];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700136 unsigned tx_skb_freelist;
137
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700138 spinlock_t rx_lock ____cacheline_aligned_in_smp;
139 struct xen_netif_rx_front_ring rx;
140 int rx_ring_ref;
141
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700142 struct timer_list rx_refill_timer;
143
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700144 struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
145 grant_ref_t gref_rx_head;
146 grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
147
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700148 unsigned long rx_pfn_array[NET_RX_RING_SIZE];
149 struct multicall_entry rx_mcl[NET_RX_RING_SIZE+1];
150 struct mmu_update rx_mmu[NET_RX_RING_SIZE];
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100151};
152
153struct netfront_info {
154 struct list_head list;
155 struct net_device *netdev;
156
157 struct xenbus_device *xbdev;
158
159 /* Multi-queue support */
160 struct netfront_queue *queues;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000161
162 /* Statistics */
stephen hemmingere00f85b2011-06-21 05:35:31 +0000163 struct netfront_stats __percpu *stats;
164
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100165 atomic_t rx_gso_checksum_fixup;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700166};
167
168struct netfront_rx_info {
169 struct xen_netif_rx_response rx;
170 struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
171};
172
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700173static void skb_entry_set_link(union skb_entry *list, unsigned short id)
174{
175 list->link = id;
176}
177
178static int skb_entry_is_link(const union skb_entry *list)
179{
180 BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
Eric Dumazet807540b2010-09-23 05:40:09 +0000181 return (unsigned long)list->skb < PAGE_OFFSET;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700182}
183
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700184/*
185 * Access macros for acquiring freeing slots in tx_skbs[].
186 */
187
188static void add_id_to_freelist(unsigned *head, union skb_entry *list,
189 unsigned short id)
190{
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700191 skb_entry_set_link(&list[id], *head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700192 *head = id;
193}
194
195static unsigned short get_id_from_freelist(unsigned *head,
196 union skb_entry *list)
197{
198 unsigned int id = *head;
199 *head = list[id].link;
200 return id;
201}
202
203static int xennet_rxidx(RING_IDX idx)
204{
205 return idx & (NET_RX_RING_SIZE - 1);
206}
207
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100208static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700209 RING_IDX ri)
210{
211 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100212 struct sk_buff *skb = queue->rx_skbs[i];
213 queue->rx_skbs[i] = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700214 return skb;
215}
216
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100217static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700218 RING_IDX ri)
219{
220 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100221 grant_ref_t ref = queue->grant_rx_ref[i];
222 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700223 return ref;
224}
225
226#ifdef CONFIG_SYSFS
227static int xennet_sysfs_addif(struct net_device *netdev);
228static void xennet_sysfs_delif(struct net_device *netdev);
229#else /* !CONFIG_SYSFS */
230#define xennet_sysfs_addif(dev) (0)
231#define xennet_sysfs_delif(dev) do { } while (0)
232#endif
233
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000234static bool xennet_can_sg(struct net_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700235{
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000236 return dev->features & NETIF_F_SG;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700237}
238
239
240static void rx_refill_timeout(unsigned long data)
241{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100242 struct netfront_queue *queue = (struct netfront_queue *)data;
243 napi_schedule(&queue->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700244}
245
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100246static int netfront_tx_slot_available(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700247{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100248 return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) <
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100249 (NET_TX_RING_SIZE - MAX_SKB_FRAGS - 2);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700250}
251
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100252static void xennet_maybe_wake_tx(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700253{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100254 struct net_device *dev = queue->info->netdev;
255 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700256
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100257 if (unlikely(netif_tx_queue_stopped(dev_queue)) &&
258 netfront_tx_slot_available(queue) &&
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700259 likely(netif_running(dev)))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100260 netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700261}
262
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100263
264static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700265{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700266 struct sk_buff *skb;
267 struct page *page;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100268
269 skb = __netdev_alloc_skb(queue->info->netdev,
270 RX_COPY_THRESHOLD + NET_IP_ALIGN,
271 GFP_ATOMIC | __GFP_NOWARN);
272 if (unlikely(!skb))
273 return NULL;
274
275 page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
276 if (!page) {
277 kfree_skb(skb);
278 return NULL;
279 }
280 skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
281
282 /* Align ip header to a 16 bytes boundary */
283 skb_reserve(skb, NET_IP_ALIGN);
284 skb->dev = queue->info->netdev;
285
286 return skb;
287}
288
289
290static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
291{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100292 RING_IDX req_prod = queue->rx.req_prod_pvt;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100293 int notify;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700294
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100295 if (unlikely(!netif_carrier_ok(queue->info->netdev)))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700296 return;
297
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100298 for (req_prod = queue->rx.req_prod_pvt;
299 req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE;
300 req_prod++) {
301 struct sk_buff *skb;
302 unsigned short id;
303 grant_ref_t ref;
304 unsigned long pfn;
305 struct xen_netif_rx_request *req;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700306
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100307 skb = xennet_alloc_one_rx_buffer(queue);
308 if (!skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700309 break;
310
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100311 id = xennet_rxidx(req_prod);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700312
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100313 BUG_ON(queue->rx_skbs[id]);
314 queue->rx_skbs[id] = skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700315
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100316 ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700317 BUG_ON((signed short)ref < 0);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100318 queue->grant_rx_ref[id] = ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700319
Ian Campbell01c68022011-10-05 00:28:47 +0000320 pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700321
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100322 req = RING_GET_REQUEST(&queue->rx, req_prod);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700323 gnttab_grant_foreign_access_ref(ref,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100324 queue->info->xbdev->otherend_id,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700325 pfn_to_mfn(pfn),
326 0);
327
328 req->id = id;
329 req->gref = ref;
330 }
331
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100332 queue->rx.req_prod_pvt = req_prod;
333
334 /* Not enough requests? Try again later. */
335 if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN) {
336 mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
337 return;
338 }
339
Jeremy Fitzhardinge5dcddfa2007-08-07 14:56:42 -0700340 wmb(); /* barrier so backend seens requests */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700341
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100342 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700343 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100344 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700345}
346
347static int xennet_open(struct net_device *dev)
348{
349 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100350 unsigned int num_queues = dev->real_num_tx_queues;
351 unsigned int i = 0;
352 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700353
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100354 for (i = 0; i < num_queues; ++i) {
355 queue = &np->queues[i];
356 napi_enable(&queue->napi);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700357
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100358 spin_lock_bh(&queue->rx_lock);
359 if (netif_carrier_ok(dev)) {
360 xennet_alloc_rx_buffers(queue);
361 queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1;
362 if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))
363 napi_schedule(&queue->napi);
364 }
365 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700366 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700367
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100368 netif_tx_start_all_queues(dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700369
370 return 0;
371}
372
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100373static void xennet_tx_buf_gc(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700374{
375 RING_IDX cons, prod;
376 unsigned short id;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700377 struct sk_buff *skb;
378
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100379 BUG_ON(!netif_carrier_ok(queue->info->netdev));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700380
381 do {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100382 prod = queue->tx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700383 rmb(); /* Ensure we see responses up to 'rp'. */
384
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100385 for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700386 struct xen_netif_tx_response *txrsp;
387
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100388 txrsp = RING_GET_RESPONSE(&queue->tx, cons);
Ian Campbellf942dc22011-03-15 00:06:18 +0000389 if (txrsp->status == XEN_NETIF_RSP_NULL)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700390 continue;
391
392 id = txrsp->id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100393 skb = queue->tx_skbs[id].skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700394 if (unlikely(gnttab_query_foreign_access(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100395 queue->grant_tx_ref[id]) != 0)) {
Joe Perches383eda32013-06-27 21:57:49 -0700396 pr_alert("%s: warning -- grant still in use by backend domain\n",
397 __func__);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700398 BUG();
399 }
400 gnttab_end_foreign_access_ref(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100401 queue->grant_tx_ref[id], GNTMAP_readonly);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700402 gnttab_release_grant_reference(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100403 &queue->gref_tx_head, queue->grant_tx_ref[id]);
404 queue->grant_tx_ref[id] = GRANT_INVALID_REF;
405 queue->grant_tx_page[id] = NULL;
406 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700407 dev_kfree_skb_irq(skb);
408 }
409
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100410 queue->tx.rsp_cons = prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700411
412 /*
413 * Set a new event, then check for race with update of tx_cons.
414 * Note that it is essential to schedule a callback, no matter
415 * how few buffers are pending. Even if there is space in the
416 * transmit ring, higher layers may be blocked because too much
417 * data is outstanding: in such cases notification from Xen is
418 * likely to be the only kick that we'll get.
419 */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100420 queue->tx.sring->rsp_event =
421 prod + ((queue->tx.sring->req_prod - prod) >> 1) + 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700422 mb(); /* update shared area */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100423 } while ((cons == prod) && (prod != queue->tx.sring->rsp_prod));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700424
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100425 xennet_maybe_wake_tx(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700426}
427
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100428static void xennet_make_frags(struct sk_buff *skb, struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700429 struct xen_netif_tx_request *tx)
430{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700431 char *data = skb->data;
432 unsigned long mfn;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100433 RING_IDX prod = queue->tx.req_prod_pvt;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700434 int frags = skb_shinfo(skb)->nr_frags;
435 unsigned int offset = offset_in_page(data);
436 unsigned int len = skb_headlen(skb);
437 unsigned int id;
438 grant_ref_t ref;
439 int i;
440
441 /* While the header overlaps a page boundary (including being
442 larger than a page), split it it into page-sized chunks. */
443 while (len > PAGE_SIZE - offset) {
444 tx->size = PAGE_SIZE - offset;
Ian Campbellf942dc22011-03-15 00:06:18 +0000445 tx->flags |= XEN_NETTXF_more_data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700446 len -= tx->size;
447 data += tx->size;
448 offset = 0;
449
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100450 id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
451 queue->tx_skbs[id].skb = skb_get(skb);
452 tx = RING_GET_REQUEST(&queue->tx, prod++);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700453 tx->id = id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100454 ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700455 BUG_ON((signed short)ref < 0);
456
457 mfn = virt_to_mfn(data);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100458 gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700459 mfn, GNTMAP_readonly);
460
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100461 queue->grant_tx_page[id] = virt_to_page(data);
462 tx->gref = queue->grant_tx_ref[id] = ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700463 tx->offset = offset;
464 tx->size = len;
465 tx->flags = 0;
466 }
467
468 /* Grant backend access to each skb fragment page. */
469 for (i = 0; i < frags; i++) {
470 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
Ian Campbellf36c3742012-11-21 02:02:16 +0000471 struct page *page = skb_frag_page(frag);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700472
Ian Campbellf36c3742012-11-21 02:02:16 +0000473 len = skb_frag_size(frag);
474 offset = frag->page_offset;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700475
Ian Campbellf36c3742012-11-21 02:02:16 +0000476 /* Skip unused frames from start of page */
477 page += offset >> PAGE_SHIFT;
478 offset &= ~PAGE_MASK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700479
Ian Campbellf36c3742012-11-21 02:02:16 +0000480 while (len > 0) {
481 unsigned long bytes;
482
Ian Campbellf36c3742012-11-21 02:02:16 +0000483 bytes = PAGE_SIZE - offset;
484 if (bytes > len)
485 bytes = len;
486
487 tx->flags |= XEN_NETTXF_more_data;
488
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100489 id = get_id_from_freelist(&queue->tx_skb_freelist,
490 queue->tx_skbs);
491 queue->tx_skbs[id].skb = skb_get(skb);
492 tx = RING_GET_REQUEST(&queue->tx, prod++);
Ian Campbellf36c3742012-11-21 02:02:16 +0000493 tx->id = id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100494 ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
Ian Campbellf36c3742012-11-21 02:02:16 +0000495 BUG_ON((signed short)ref < 0);
496
497 mfn = pfn_to_mfn(page_to_pfn(page));
498 gnttab_grant_foreign_access_ref(ref,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100499 queue->info->xbdev->otherend_id,
Ian Campbellf36c3742012-11-21 02:02:16 +0000500 mfn, GNTMAP_readonly);
501
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100502 queue->grant_tx_page[id] = page;
503 tx->gref = queue->grant_tx_ref[id] = ref;
Ian Campbellf36c3742012-11-21 02:02:16 +0000504 tx->offset = offset;
505 tx->size = bytes;
506 tx->flags = 0;
507
508 offset += bytes;
509 len -= bytes;
510
511 /* Next frame */
512 if (offset == PAGE_SIZE && len) {
513 BUG_ON(!PageCompound(page));
514 page++;
515 offset = 0;
516 }
517 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700518 }
519
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100520 queue->tx.req_prod_pvt = prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700521}
522
Ian Campbellf36c3742012-11-21 02:02:16 +0000523/*
524 * Count how many ring slots are required to send the frags of this
525 * skb. Each frag might be a compound page.
526 */
527static int xennet_count_skb_frag_slots(struct sk_buff *skb)
528{
529 int i, frags = skb_shinfo(skb)->nr_frags;
530 int pages = 0;
531
532 for (i = 0; i < frags; i++) {
533 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
534 unsigned long size = skb_frag_size(frag);
535 unsigned long offset = frag->page_offset;
536
537 /* Skip unused frames from start of page */
538 offset &= ~PAGE_MASK;
539
540 pages += PFN_UP(offset + size);
541 }
542
543 return pages;
544}
545
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100546static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb,
547 void *accel_priv, select_queue_fallback_t fallback)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100548{
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100549 unsigned int num_queues = dev->real_num_tx_queues;
550 u32 hash;
551 u16 queue_idx;
552
553 /* First, check if there is only one queue */
554 if (num_queues == 1) {
555 queue_idx = 0;
556 } else {
557 hash = skb_get_hash(skb);
558 queue_idx = hash % num_queues;
559 }
560
561 return queue_idx;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100562}
563
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700564static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
565{
566 unsigned short id;
567 struct netfront_info *np = netdev_priv(dev);
stephen hemmingere00f85b2011-06-21 05:35:31 +0000568 struct netfront_stats *stats = this_cpu_ptr(np->stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700569 struct xen_netif_tx_request *tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700570 char *data = skb->data;
571 RING_IDX i;
572 grant_ref_t ref;
573 unsigned long mfn;
574 int notify;
Ian Campbellf36c3742012-11-21 02:02:16 +0000575 int slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700576 unsigned int offset = offset_in_page(data);
577 unsigned int len = skb_headlen(skb);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000578 unsigned long flags;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100579 struct netfront_queue *queue = NULL;
580 unsigned int num_queues = dev->real_num_tx_queues;
581 u16 queue_index;
582
583 /* Drop the packet if no queues are set up */
584 if (num_queues < 1)
585 goto drop;
586 /* Determine which queue to transmit this SKB on */
587 queue_index = skb_get_queue_mapping(skb);
588 queue = &np->queues[queue_index];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700589
Wei Liu9ecd1a72013-04-22 02:20:41 +0000590 /* If skb->len is too big for wire format, drop skb and alert
591 * user about misconfiguration.
592 */
593 if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
594 net_alert_ratelimited(
595 "xennet: skb->len = %u, too big for wire format\n",
596 skb->len);
597 goto drop;
598 }
599
Ian Campbellf36c3742012-11-21 02:02:16 +0000600 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE) +
601 xennet_count_skb_frag_slots(skb);
602 if (unlikely(slots > MAX_SKB_FRAGS + 1)) {
Zoltan Kiss97a6d1b2014-08-11 18:32:23 +0100603 net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n",
604 slots, skb->len);
605 if (skb_linearize(skb))
606 goto drop;
David Vrabel11d3d2a2014-12-09 18:43:28 +0000607 data = skb->data;
608 offset = offset_in_page(data);
609 len = skb_headlen(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700610 }
611
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100612 spin_lock_irqsave(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700613
614 if (unlikely(!netif_carrier_ok(dev) ||
Ian Campbellf36c3742012-11-21 02:02:16 +0000615 (slots > 1 && !xennet_can_sg(dev)) ||
Tom Herbert04ffcb22014-10-14 15:19:06 -0700616 netif_needs_gso(dev, skb, netif_skb_features(skb)))) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100617 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700618 goto drop;
619 }
620
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100621 i = queue->tx.req_prod_pvt;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700622
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100623 id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
624 queue->tx_skbs[id].skb = skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700625
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100626 tx = RING_GET_REQUEST(&queue->tx, i);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700627
628 tx->id = id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100629 ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700630 BUG_ON((signed short)ref < 0);
631 mfn = virt_to_mfn(data);
632 gnttab_grant_foreign_access_ref(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100633 ref, queue->info->xbdev->otherend_id, mfn, GNTMAP_readonly);
634 queue->grant_tx_page[id] = virt_to_page(data);
635 tx->gref = queue->grant_tx_ref[id] = ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700636 tx->offset = offset;
637 tx->size = len;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700638
639 tx->flags = 0;
640 if (skb->ip_summed == CHECKSUM_PARTIAL)
641 /* local packet? */
Ian Campbellf942dc22011-03-15 00:06:18 +0000642 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700643 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
644 /* remote but checksummed. */
Ian Campbellf942dc22011-03-15 00:06:18 +0000645 tx->flags |= XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700646
647 if (skb_shinfo(skb)->gso_size) {
648 struct xen_netif_extra_info *gso;
649
650 gso = (struct xen_netif_extra_info *)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100651 RING_GET_REQUEST(&queue->tx, ++i);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700652
Wei Liue2d617c2013-03-25 01:08:17 +0000653 tx->flags |= XEN_NETTXF_extra_info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700654
655 gso->u.gso.size = skb_shinfo(skb)->gso_size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000656 gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ?
657 XEN_NETIF_GSO_TYPE_TCPV6 :
658 XEN_NETIF_GSO_TYPE_TCPV4;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700659 gso->u.gso.pad = 0;
660 gso->u.gso.features = 0;
661
662 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
663 gso->flags = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700664 }
665
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100666 queue->tx.req_prod_pvt = i + 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700667
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100668 xennet_make_frags(skb, queue, tx);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700669 tx->size = skb->len;
670
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100671 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700672 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100673 notify_remote_via_irq(queue->tx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700674
stephen hemmingere00f85b2011-06-21 05:35:31 +0000675 u64_stats_update_begin(&stats->syncp);
676 stats->tx_bytes += skb->len;
677 stats->tx_packets++;
678 u64_stats_update_end(&stats->syncp);
Jeremy Fitzhardinge10a273a2007-08-13 12:54:37 -0700679
680 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100681 xennet_tx_buf_gc(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700682
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100683 if (!netfront_tx_slot_available(queue))
684 netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700685
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100686 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700687
Patrick McHardy6ed10652009-06-23 06:03:08 +0000688 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700689
690 drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700691 dev->stats.tx_dropped++;
Eric W. Biederman979de8a2014-03-15 18:33:04 -0700692 dev_kfree_skb_any(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000693 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700694}
695
696static int xennet_close(struct net_device *dev)
697{
698 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100699 unsigned int num_queues = dev->real_num_tx_queues;
700 unsigned int i;
701 struct netfront_queue *queue;
702 netif_tx_stop_all_queues(np->netdev);
703 for (i = 0; i < num_queues; ++i) {
704 queue = &np->queues[i];
705 napi_disable(&queue->napi);
706 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700707 return 0;
708}
709
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100710static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700711 grant_ref_t ref)
712{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100713 int new = xennet_rxidx(queue->rx.req_prod_pvt);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700714
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100715 BUG_ON(queue->rx_skbs[new]);
716 queue->rx_skbs[new] = skb;
717 queue->grant_rx_ref[new] = ref;
718 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
719 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
720 queue->rx.req_prod_pvt++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700721}
722
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100723static int xennet_get_extras(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700724 struct xen_netif_extra_info *extras,
725 RING_IDX rp)
726
727{
728 struct xen_netif_extra_info *extra;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100729 struct device *dev = &queue->info->netdev->dev;
730 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700731 int err = 0;
732
733 do {
734 struct sk_buff *skb;
735 grant_ref_t ref;
736
737 if (unlikely(cons + 1 == rp)) {
738 if (net_ratelimit())
739 dev_warn(dev, "Missing extra info\n");
740 err = -EBADR;
741 break;
742 }
743
744 extra = (struct xen_netif_extra_info *)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100745 RING_GET_RESPONSE(&queue->rx, ++cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700746
747 if (unlikely(!extra->type ||
748 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
749 if (net_ratelimit())
750 dev_warn(dev, "Invalid extra type: %d\n",
751 extra->type);
752 err = -EINVAL;
753 } else {
754 memcpy(&extras[extra->type - 1], extra,
755 sizeof(*extra));
756 }
757
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100758 skb = xennet_get_rx_skb(queue, cons);
759 ref = xennet_get_rx_ref(queue, cons);
760 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700761 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
762
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100763 queue->rx.rsp_cons = cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700764 return err;
765}
766
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100767static int xennet_get_responses(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700768 struct netfront_rx_info *rinfo, RING_IDX rp,
769 struct sk_buff_head *list)
770{
771 struct xen_netif_rx_response *rx = &rinfo->rx;
772 struct xen_netif_extra_info *extras = rinfo->extras;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100773 struct device *dev = &queue->info->netdev->dev;
774 RING_IDX cons = queue->rx.rsp_cons;
775 struct sk_buff *skb = xennet_get_rx_skb(queue, cons);
776 grant_ref_t ref = xennet_get_rx_ref(queue, cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700777 int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
Wei Liu7158ff62013-03-25 01:08:19 +0000778 int slots = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700779 int err = 0;
780 unsigned long ret;
781
Ian Campbellf942dc22011-03-15 00:06:18 +0000782 if (rx->flags & XEN_NETRXF_extra_info) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100783 err = xennet_get_extras(queue, extras, rp);
784 cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700785 }
786
787 for (;;) {
788 if (unlikely(rx->status < 0 ||
789 rx->offset + rx->status > PAGE_SIZE)) {
790 if (net_ratelimit())
791 dev_warn(dev, "rx->offset: %x, size: %u\n",
792 rx->offset, rx->status);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100793 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700794 err = -EINVAL;
795 goto next;
796 }
797
798 /*
799 * This definitely indicates a bug, either in this driver or in
800 * the backend driver. In future this should flag the bad
Wei Liu697089d2013-04-22 02:20:40 +0000801 * situation to the system controller to reboot the backend.
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700802 */
803 if (ref == GRANT_INVALID_REF) {
804 if (net_ratelimit())
805 dev_warn(dev, "Bad rx response id %d.\n",
806 rx->id);
807 err = -EINVAL;
808 goto next;
809 }
810
811 ret = gnttab_end_foreign_access_ref(ref, 0);
812 BUG_ON(!ret);
813
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100814 gnttab_release_grant_reference(&queue->gref_rx_head, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700815
816 __skb_queue_tail(list, skb);
817
818next:
Ian Campbellf942dc22011-03-15 00:06:18 +0000819 if (!(rx->flags & XEN_NETRXF_more_data))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700820 break;
821
Wei Liu7158ff62013-03-25 01:08:19 +0000822 if (cons + slots == rp) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700823 if (net_ratelimit())
Wei Liu7158ff62013-03-25 01:08:19 +0000824 dev_warn(dev, "Need more slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700825 err = -ENOENT;
826 break;
827 }
828
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100829 rx = RING_GET_RESPONSE(&queue->rx, cons + slots);
830 skb = xennet_get_rx_skb(queue, cons + slots);
831 ref = xennet_get_rx_ref(queue, cons + slots);
Wei Liu7158ff62013-03-25 01:08:19 +0000832 slots++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700833 }
834
Wei Liu7158ff62013-03-25 01:08:19 +0000835 if (unlikely(slots > max)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700836 if (net_ratelimit())
Wei Liu697089d2013-04-22 02:20:40 +0000837 dev_warn(dev, "Too many slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700838 err = -E2BIG;
839 }
840
841 if (unlikely(err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100842 queue->rx.rsp_cons = cons + slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700843
844 return err;
845}
846
847static int xennet_set_skb_gso(struct sk_buff *skb,
848 struct xen_netif_extra_info *gso)
849{
850 if (!gso->u.gso.size) {
851 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700852 pr_warn("GSO size must not be zero\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700853 return -EINVAL;
854 }
855
Paul Durrant2c0057d2014-01-15 17:30:33 +0000856 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
857 gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700858 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700859 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700860 return -EINVAL;
861 }
862
863 skb_shinfo(skb)->gso_size = gso->u.gso.size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000864 skb_shinfo(skb)->gso_type =
865 (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
866 SKB_GSO_TCPV4 :
867 SKB_GSO_TCPV6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700868
869 /* Header must be checked, and gso_segs computed. */
870 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
871 skb_shinfo(skb)->gso_segs = 0;
872
873 return 0;
874}
875
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100876static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700877 struct sk_buff *skb,
878 struct sk_buff_head *list)
879{
880 struct skb_shared_info *shinfo = skb_shinfo(skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100881 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700882 struct sk_buff *nskb;
883
884 while ((nskb = __skb_dequeue(list))) {
885 struct xen_netif_rx_response *rx =
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100886 RING_GET_RESPONSE(&queue->rx, ++cons);
Ian Campbell01c68022011-10-05 00:28:47 +0000887 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700888
Jan Beulich093b9c72013-07-17 08:09:37 +0100889 if (shinfo->nr_frags == MAX_SKB_FRAGS) {
890 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700891
Jan Beulich093b9c72013-07-17 08:09:37 +0100892 BUG_ON(pull_to <= skb_headlen(skb));
893 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
894 }
895 BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
896
897 skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
898 rx->offset, rx->status, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700899
900 skb_shinfo(nskb)->nr_frags = 0;
901 kfree_skb(nskb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700902 }
903
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700904 return cons;
905}
906
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000907static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700908{
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000909 bool recalculate_partial_csum = false;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000910
911 /*
912 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
913 * peers can fail to set NETRXF_csum_blank when sending a GSO
914 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
915 * recalculate the partial checksum.
916 */
917 if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
918 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100919 atomic_inc(&np->rx_gso_checksum_fixup);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000920 skb->ip_summed = CHECKSUM_PARTIAL;
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000921 recalculate_partial_csum = true;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000922 }
923
924 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
925 if (skb->ip_summed != CHECKSUM_PARTIAL)
926 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700927
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000928 return skb_checksum_setup(skb, recalculate_partial_csum);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700929}
930
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100931static int handle_incoming_queue(struct netfront_queue *queue,
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700932 struct sk_buff_head *rxq)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700933{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100934 struct netfront_stats *stats = this_cpu_ptr(queue->info->stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700935 int packets_dropped = 0;
936 struct sk_buff *skb;
937
938 while ((skb = __skb_dequeue(rxq)) != NULL) {
Ian Campbell36832432012-08-22 00:26:47 +0000939 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700940
Jan Beulich093b9c72013-07-17 08:09:37 +0100941 if (pull_to > skb_headlen(skb))
942 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700943
944 /* Ethernet work: Delayed to here as it peeks the header. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100945 skb->protocol = eth_type_trans(skb, queue->info->netdev);
Wei Liud554f732014-02-19 18:48:34 +0000946 skb_reset_network_header(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700947
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100948 if (checksum_setup(queue->info->netdev, skb)) {
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000949 kfree_skb(skb);
950 packets_dropped++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100951 queue->info->netdev->stats.rx_errors++;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000952 continue;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700953 }
954
stephen hemmingere00f85b2011-06-21 05:35:31 +0000955 u64_stats_update_begin(&stats->syncp);
956 stats->rx_packets++;
957 stats->rx_bytes += skb->len;
958 u64_stats_update_end(&stats->syncp);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700959
960 /* Pass it up. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100961 napi_gro_receive(&queue->napi, skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700962 }
963
964 return packets_dropped;
965}
966
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700967static int xennet_poll(struct napi_struct *napi, int budget)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700968{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100969 struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
970 struct net_device *dev = queue->info->netdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700971 struct sk_buff *skb;
972 struct netfront_rx_info rinfo;
973 struct xen_netif_rx_response *rx = &rinfo.rx;
974 struct xen_netif_extra_info *extras = rinfo.extras;
975 RING_IDX i, rp;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700976 int work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700977 struct sk_buff_head rxq;
978 struct sk_buff_head errq;
979 struct sk_buff_head tmpq;
980 unsigned long flags;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700981 int err;
982
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100983 spin_lock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700984
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700985 skb_queue_head_init(&rxq);
986 skb_queue_head_init(&errq);
987 skb_queue_head_init(&tmpq);
988
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100989 rp = queue->rx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700990 rmb(); /* Ensure we see queued responses up to 'rp'. */
991
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100992 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700993 work_done = 0;
994 while ((i != rp) && (work_done < budget)) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100995 memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700996 memset(extras, 0, sizeof(rinfo.extras));
997
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100998 err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700999
1000 if (unlikely(err)) {
1001err:
1002 while ((skb = __skb_dequeue(&tmpq)))
1003 __skb_queue_tail(&errq, skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -07001004 dev->stats.rx_errors++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001005 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001006 continue;
1007 }
1008
1009 skb = __skb_dequeue(&tmpq);
1010
1011 if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
1012 struct xen_netif_extra_info *gso;
1013 gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
1014
1015 if (unlikely(xennet_set_skb_gso(skb, gso))) {
1016 __skb_queue_head(&tmpq, skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001017 queue->rx.rsp_cons += skb_queue_len(&tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001018 goto err;
1019 }
1020 }
1021
Ian Campbell36832432012-08-22 00:26:47 +00001022 NETFRONT_SKB_CB(skb)->pull_to = rx->status;
1023 if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
1024 NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001025
Ian Campbell36832432012-08-22 00:26:47 +00001026 skb_shinfo(skb)->frags[0].page_offset = rx->offset;
1027 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1028 skb->data_len = rx->status;
Jan Beulich093b9c72013-07-17 08:09:37 +01001029 skb->len += rx->status;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001030
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001031 i = xennet_fill_frags(queue, skb, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001032
Ian Campbellf942dc22011-03-15 00:06:18 +00001033 if (rx->flags & XEN_NETRXF_csum_blank)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001034 skb->ip_summed = CHECKSUM_PARTIAL;
Ian Campbellf942dc22011-03-15 00:06:18 +00001035 else if (rx->flags & XEN_NETRXF_data_validated)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001036 skb->ip_summed = CHECKSUM_UNNECESSARY;
1037
1038 __skb_queue_tail(&rxq, skb);
1039
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001040 queue->rx.rsp_cons = ++i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001041 work_done++;
1042 }
1043
Wang Chen56cfe5d2008-05-22 18:09:06 +08001044 __skb_queue_purge(&errq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001045
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001046 work_done -= handle_incoming_queue(queue, &rxq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001047
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001048 xennet_alloc_rx_buffers(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001049
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001050 if (work_done < budget) {
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001051 int more_to_do = 0;
1052
Wei Liu99d3d582013-09-30 13:46:34 +01001053 napi_gro_flush(napi, false);
1054
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001055 local_irq_save(flags);
1056
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001057 RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001058 if (!more_to_do)
Ben Hutchings288379f2009-01-19 16:43:59 -08001059 __napi_complete(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001060
1061 local_irq_restore(flags);
1062 }
1063
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001064 spin_unlock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001065
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001066 return work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001067}
1068
1069static int xennet_change_mtu(struct net_device *dev, int mtu)
1070{
Wei Liu9ecd1a72013-04-22 02:20:41 +00001071 int max = xennet_can_sg(dev) ?
1072 XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER : ETH_DATA_LEN;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001073
1074 if (mtu > max)
1075 return -EINVAL;
1076 dev->mtu = mtu;
1077 return 0;
1078}
1079
stephen hemmingere00f85b2011-06-21 05:35:31 +00001080static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
1081 struct rtnl_link_stats64 *tot)
1082{
1083 struct netfront_info *np = netdev_priv(dev);
1084 int cpu;
1085
1086 for_each_possible_cpu(cpu) {
1087 struct netfront_stats *stats = per_cpu_ptr(np->stats, cpu);
1088 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1089 unsigned int start;
1090
1091 do {
Eric W. Biederman57a77442014-03-13 21:26:42 -07001092 start = u64_stats_fetch_begin_irq(&stats->syncp);
stephen hemmingere00f85b2011-06-21 05:35:31 +00001093
1094 rx_packets = stats->rx_packets;
1095 tx_packets = stats->tx_packets;
1096 rx_bytes = stats->rx_bytes;
1097 tx_bytes = stats->tx_bytes;
Eric W. Biederman57a77442014-03-13 21:26:42 -07001098 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
stephen hemmingere00f85b2011-06-21 05:35:31 +00001099
1100 tot->rx_packets += rx_packets;
1101 tot->tx_packets += tx_packets;
1102 tot->rx_bytes += rx_bytes;
1103 tot->tx_bytes += tx_bytes;
1104 }
1105
1106 tot->rx_errors = dev->stats.rx_errors;
1107 tot->tx_dropped = dev->stats.tx_dropped;
1108
1109 return tot;
1110}
1111
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001112static void xennet_release_tx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001113{
1114 struct sk_buff *skb;
1115 int i;
1116
1117 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1118 /* Skip over entries which are actually freelist references */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001119 if (skb_entry_is_link(&queue->tx_skbs[i]))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001120 continue;
1121
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001122 skb = queue->tx_skbs[i].skb;
1123 get_page(queue->grant_tx_page[i]);
1124 gnttab_end_foreign_access(queue->grant_tx_ref[i],
Annie Licefe0072014-01-28 11:35:42 +08001125 GNTMAP_readonly,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001126 (unsigned long)page_address(queue->grant_tx_page[i]));
1127 queue->grant_tx_page[i] = NULL;
1128 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1129 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001130 dev_kfree_skb_irq(skb);
1131 }
1132}
1133
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001134static void xennet_release_rx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001135{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001136 int id, ref;
1137
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001138 spin_lock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001139
1140 for (id = 0; id < NET_RX_RING_SIZE; id++) {
Annie Licefe0072014-01-28 11:35:42 +08001141 struct sk_buff *skb;
1142 struct page *page;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001143
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001144 skb = queue->rx_skbs[id];
Annie Licefe0072014-01-28 11:35:42 +08001145 if (!skb)
1146 continue;
1147
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001148 ref = queue->grant_rx_ref[id];
Annie Licefe0072014-01-28 11:35:42 +08001149 if (ref == GRANT_INVALID_REF)
1150 continue;
1151
1152 page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
1153
1154 /* gnttab_end_foreign_access() needs a page ref until
1155 * foreign access is ended (which may be deferred).
1156 */
1157 get_page(page);
1158 gnttab_end_foreign_access(ref, 0,
1159 (unsigned long)page_address(page));
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001160 queue->grant_rx_ref[id] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001161
Annie Licefe0072014-01-28 11:35:42 +08001162 kfree_skb(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001163 }
1164
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001165 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001166}
1167
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001168static netdev_features_t xennet_fix_features(struct net_device *dev,
1169 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001170{
1171 struct netfront_info *np = netdev_priv(dev);
1172 int val;
1173
1174 if (features & NETIF_F_SG) {
1175 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
1176 "%d", &val) < 0)
1177 val = 0;
1178
1179 if (!val)
1180 features &= ~NETIF_F_SG;
1181 }
1182
Paul Durrant2c0057d2014-01-15 17:30:33 +00001183 if (features & NETIF_F_IPV6_CSUM) {
1184 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1185 "feature-ipv6-csum-offload", "%d", &val) < 0)
1186 val = 0;
1187
1188 if (!val)
1189 features &= ~NETIF_F_IPV6_CSUM;
1190 }
1191
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001192 if (features & NETIF_F_TSO) {
1193 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1194 "feature-gso-tcpv4", "%d", &val) < 0)
1195 val = 0;
1196
1197 if (!val)
1198 features &= ~NETIF_F_TSO;
1199 }
1200
Paul Durrant2c0057d2014-01-15 17:30:33 +00001201 if (features & NETIF_F_TSO6) {
1202 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1203 "feature-gso-tcpv6", "%d", &val) < 0)
1204 val = 0;
1205
1206 if (!val)
1207 features &= ~NETIF_F_TSO6;
1208 }
1209
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001210 return features;
1211}
1212
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001213static int xennet_set_features(struct net_device *dev,
1214 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001215{
1216 if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
1217 netdev_info(dev, "Reducing MTU because no SG offload");
1218 dev->mtu = ETH_DATA_LEN;
1219 }
1220
1221 return 0;
1222}
1223
Wei Liud634bf22013-05-22 06:34:46 +00001224static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001225{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001226 struct netfront_queue *queue = dev_id;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001227 unsigned long flags;
1228
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001229 spin_lock_irqsave(&queue->tx_lock, flags);
1230 xennet_tx_buf_gc(queue);
1231 spin_unlock_irqrestore(&queue->tx_lock, flags);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001232
1233 return IRQ_HANDLED;
1234}
1235
Wei Liud634bf22013-05-22 06:34:46 +00001236static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1237{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001238 struct netfront_queue *queue = dev_id;
1239 struct net_device *dev = queue->info->netdev;
Wei Liud634bf22013-05-22 06:34:46 +00001240
1241 if (likely(netif_carrier_ok(dev) &&
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001242 RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
David Vrabel76541862014-06-18 10:47:27 +01001243 napi_schedule(&queue->napi);
Wei Liud634bf22013-05-22 06:34:46 +00001244
1245 return IRQ_HANDLED;
1246}
1247
1248static irqreturn_t xennet_interrupt(int irq, void *dev_id)
1249{
1250 xennet_tx_interrupt(irq, dev_id);
1251 xennet_rx_interrupt(irq, dev_id);
1252 return IRQ_HANDLED;
1253}
1254
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001255#ifdef CONFIG_NET_POLL_CONTROLLER
1256static void xennet_poll_controller(struct net_device *dev)
1257{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001258 /* Poll each queue */
1259 struct netfront_info *info = netdev_priv(dev);
1260 unsigned int num_queues = dev->real_num_tx_queues;
1261 unsigned int i;
1262 for (i = 0; i < num_queues; ++i)
1263 xennet_interrupt(0, &info->queues[i]);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001264}
1265#endif
1266
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001267static const struct net_device_ops xennet_netdev_ops = {
1268 .ndo_open = xennet_open,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001269 .ndo_stop = xennet_close,
1270 .ndo_start_xmit = xennet_start_xmit,
1271 .ndo_change_mtu = xennet_change_mtu,
stephen hemmingere00f85b2011-06-21 05:35:31 +00001272 .ndo_get_stats64 = xennet_get_stats64,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001273 .ndo_set_mac_address = eth_mac_addr,
1274 .ndo_validate_addr = eth_validate_addr,
Michał Mirosławfb507932011-03-31 01:01:35 +00001275 .ndo_fix_features = xennet_fix_features,
1276 .ndo_set_features = xennet_set_features,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001277 .ndo_select_queue = xennet_select_queue,
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001278#ifdef CONFIG_NET_POLL_CONTROLLER
1279 .ndo_poll_controller = xennet_poll_controller,
1280#endif
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001281};
1282
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001283static struct net_device *xennet_create_dev(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001284{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001285 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001286 struct net_device *netdev;
1287 struct netfront_info *np;
1288
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001289 netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues);
Joe Perches41de8d42012-01-29 13:47:52 +00001290 if (!netdev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001291 return ERR_PTR(-ENOMEM);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001292
1293 np = netdev_priv(netdev);
1294 np->xbdev = dev;
1295
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001296 /* No need to use rtnl_lock() before the call below as it
1297 * happens before register_netdev().
1298 */
1299 netif_set_real_num_tx_queues(netdev, 0);
1300 np->queues = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001301
stephen hemmingere00f85b2011-06-21 05:35:31 +00001302 err = -ENOMEM;
WANG Cong1c213bd2014-02-13 11:46:28 -08001303 np->stats = netdev_alloc_pcpu_stats(struct netfront_stats);
stephen hemmingere00f85b2011-06-21 05:35:31 +00001304 if (np->stats == NULL)
1305 goto exit;
1306
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001307 netdev->netdev_ops = &xennet_netdev_ops;
1308
Michał Mirosławfb507932011-03-31 01:01:35 +00001309 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1310 NETIF_F_GSO_ROBUST;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001311 netdev->hw_features = NETIF_F_SG |
1312 NETIF_F_IPV6_CSUM |
1313 NETIF_F_TSO | NETIF_F_TSO6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001314
Ian Campbellfc3e5942011-04-04 11:07:57 -07001315 /*
1316 * Assume that all hw features are available for now. This set
1317 * will be adjusted by the call to netdev_update_features() in
1318 * xennet_connect() which is the earliest point where we can
1319 * negotiate with the backend regarding supported features.
1320 */
1321 netdev->features |= netdev->hw_features;
1322
Wilfried Klaebe7ad24ea2014-05-11 00:12:32 +00001323 netdev->ethtool_ops = &xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001324 SET_NETDEV_DEV(netdev, &dev->dev);
1325
Wei Liu9ecd1a72013-04-22 02:20:41 +00001326 netif_set_gso_max_size(netdev, XEN_NETIF_MAX_TX_SIZE - MAX_TCP_HEADER);
1327
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001328 np->netdev = netdev;
1329
1330 netif_carrier_off(netdev);
1331
1332 return netdev;
1333
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001334 exit:
1335 free_netdev(netdev);
1336 return ERR_PTR(err);
1337}
1338
1339/**
1340 * Entry point to this code when a new device is created. Allocate the basic
1341 * structures and the ring buffers for communication with the backend, and
1342 * inform the backend of the appropriate details for those.
1343 */
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001344static int netfront_probe(struct xenbus_device *dev,
Greg Kroah-Hartman1dd06ae2012-12-06 14:30:56 +00001345 const struct xenbus_device_id *id)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001346{
1347 int err;
1348 struct net_device *netdev;
1349 struct netfront_info *info;
1350
1351 netdev = xennet_create_dev(dev);
1352 if (IS_ERR(netdev)) {
1353 err = PTR_ERR(netdev);
1354 xenbus_dev_fatal(dev, err, "creating netdev");
1355 return err;
1356 }
1357
1358 info = netdev_priv(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001359 dev_set_drvdata(&dev->dev, info);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001360
1361 err = register_netdev(info->netdev);
1362 if (err) {
Joe Perches383eda32013-06-27 21:57:49 -07001363 pr_warn("%s: register_netdev err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001364 goto fail;
1365 }
1366
1367 err = xennet_sysfs_addif(info->netdev);
1368 if (err) {
1369 unregister_netdev(info->netdev);
Joe Perches383eda32013-06-27 21:57:49 -07001370 pr_warn("%s: add sysfs failed err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001371 goto fail;
1372 }
1373
1374 return 0;
1375
1376 fail:
1377 free_netdev(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001378 dev_set_drvdata(&dev->dev, NULL);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001379 return err;
1380}
1381
1382static void xennet_end_access(int ref, void *page)
1383{
1384 /* This frees the page as a side-effect */
1385 if (ref != GRANT_INVALID_REF)
1386 gnttab_end_foreign_access(ref, 0, (unsigned long)page);
1387}
1388
1389static void xennet_disconnect_backend(struct netfront_info *info)
1390{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001391 unsigned int i = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001392 unsigned int num_queues = info->netdev->real_num_tx_queues;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001393
David Vrabelf9feb1e2014-07-02 16:09:15 +01001394 netif_carrier_off(info->netdev);
1395
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001396 for (i = 0; i < num_queues; ++i) {
David Vrabel76541862014-06-18 10:47:27 +01001397 struct netfront_queue *queue = &info->queues[i];
1398
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001399 if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
1400 unbind_from_irqhandler(queue->tx_irq, queue);
1401 if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
1402 unbind_from_irqhandler(queue->tx_irq, queue);
1403 unbind_from_irqhandler(queue->rx_irq, queue);
1404 }
1405 queue->tx_evtchn = queue->rx_evtchn = 0;
1406 queue->tx_irq = queue->rx_irq = 0;
1407
David Vrabelf9feb1e2014-07-02 16:09:15 +01001408 napi_synchronize(&queue->napi);
1409
David Vrabela5b5dc32014-07-31 17:38:23 +01001410 xennet_release_tx_bufs(queue);
1411 xennet_release_rx_bufs(queue);
1412 gnttab_free_grant_references(queue->gref_tx_head);
1413 gnttab_free_grant_references(queue->gref_rx_head);
1414
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001415 /* End access and free the pages */
1416 xennet_end_access(queue->tx_ring_ref, queue->tx.sring);
1417 xennet_end_access(queue->rx_ring_ref, queue->rx.sring);
1418
1419 queue->tx_ring_ref = GRANT_INVALID_REF;
1420 queue->rx_ring_ref = GRANT_INVALID_REF;
1421 queue->tx.sring = NULL;
1422 queue->rx.sring = NULL;
Wei Liud634bf22013-05-22 06:34:46 +00001423 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001424}
1425
1426/**
1427 * We are reconnecting to the backend, due to a suspend/resume, or a backend
1428 * driver restart. We tear down our netif structure and recreate it, but
1429 * leave the device-layer structures intact so that this is transparent to the
1430 * rest of the kernel.
1431 */
1432static int netfront_resume(struct xenbus_device *dev)
1433{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001434 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001435
1436 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1437
1438 xennet_disconnect_backend(info);
1439 return 0;
1440}
1441
1442static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
1443{
1444 char *s, *e, *macstr;
1445 int i;
1446
1447 macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
1448 if (IS_ERR(macstr))
1449 return PTR_ERR(macstr);
1450
1451 for (i = 0; i < ETH_ALEN; i++) {
1452 mac[i] = simple_strtoul(s, &e, 16);
1453 if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
1454 kfree(macstr);
1455 return -ENOENT;
1456 }
1457 s = e+1;
1458 }
1459
1460 kfree(macstr);
1461 return 0;
1462}
1463
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001464static int setup_netfront_single(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001465{
1466 int err;
1467
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001468 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001469 if (err < 0)
1470 goto fail;
1471
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001472 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001473 xennet_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001474 0, queue->info->netdev->name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001475 if (err < 0)
1476 goto bind_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001477 queue->rx_evtchn = queue->tx_evtchn;
1478 queue->rx_irq = queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001479
1480 return 0;
1481
1482bind_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001483 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1484 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001485fail:
1486 return err;
1487}
1488
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001489static int setup_netfront_split(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001490{
1491 int err;
1492
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001493 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001494 if (err < 0)
1495 goto fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001496 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001497 if (err < 0)
1498 goto alloc_rx_evtchn_fail;
1499
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001500 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
1501 "%s-tx", queue->name);
1502 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001503 xennet_tx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001504 0, queue->tx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001505 if (err < 0)
1506 goto bind_tx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001507 queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001508
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001509 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
1510 "%s-rx", queue->name);
1511 err = bind_evtchn_to_irqhandler(queue->rx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001512 xennet_rx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001513 0, queue->rx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001514 if (err < 0)
1515 goto bind_rx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001516 queue->rx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001517
1518 return 0;
1519
1520bind_rx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001521 unbind_from_irqhandler(queue->tx_irq, queue);
1522 queue->tx_irq = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001523bind_tx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001524 xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
1525 queue->rx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001526alloc_rx_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001527 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1528 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001529fail:
1530 return err;
1531}
1532
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001533static int setup_netfront(struct xenbus_device *dev,
1534 struct netfront_queue *queue, unsigned int feature_split_evtchn)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001535{
1536 struct xen_netif_tx_sring *txs;
1537 struct xen_netif_rx_sring *rxs;
1538 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001539
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001540 queue->tx_ring_ref = GRANT_INVALID_REF;
1541 queue->rx_ring_ref = GRANT_INVALID_REF;
1542 queue->rx.sring = NULL;
1543 queue->tx.sring = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001544
Ian Campbella144ff02008-06-17 10:47:08 +02001545 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001546 if (!txs) {
1547 err = -ENOMEM;
1548 xenbus_dev_fatal(dev, err, "allocating tx ring page");
1549 goto fail;
1550 }
1551 SHARED_RING_INIT(txs);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001552 FRONT_RING_INIT(&queue->tx, txs, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001553
1554 err = xenbus_grant_ring(dev, virt_to_mfn(txs));
Wei Liu1ca29832013-05-20 01:05:12 +00001555 if (err < 0)
1556 goto grant_tx_ring_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001557 queue->tx_ring_ref = err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001558
Ian Campbella144ff02008-06-17 10:47:08 +02001559 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001560 if (!rxs) {
1561 err = -ENOMEM;
1562 xenbus_dev_fatal(dev, err, "allocating rx ring page");
Wei Liu1ca29832013-05-20 01:05:12 +00001563 goto alloc_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001564 }
1565 SHARED_RING_INIT(rxs);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001566 FRONT_RING_INIT(&queue->rx, rxs, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001567
1568 err = xenbus_grant_ring(dev, virt_to_mfn(rxs));
Wei Liu1ca29832013-05-20 01:05:12 +00001569 if (err < 0)
1570 goto grant_rx_ring_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001571 queue->rx_ring_ref = err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001572
Wei Liud634bf22013-05-22 06:34:46 +00001573 if (feature_split_evtchn)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001574 err = setup_netfront_split(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001575 /* setup single event channel if
1576 * a) feature-split-event-channels == 0
1577 * b) feature-split-event-channels == 1 but failed to setup
1578 */
1579 if (!feature_split_evtchn || (feature_split_evtchn && err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001580 err = setup_netfront_single(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001581
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001582 if (err)
Wei Liu1ca29832013-05-20 01:05:12 +00001583 goto alloc_evtchn_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001584
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001585 return 0;
1586
Wei Liu1ca29832013-05-20 01:05:12 +00001587 /* If we fail to setup netfront, it is safe to just revoke access to
1588 * granted pages because backend is not accessing it at this point.
1589 */
Wei Liu1ca29832013-05-20 01:05:12 +00001590alloc_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001591 gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001592grant_rx_ring_fail:
1593 free_page((unsigned long)rxs);
1594alloc_rx_ring_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001595 gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001596grant_tx_ring_fail:
1597 free_page((unsigned long)txs);
1598fail:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001599 return err;
1600}
1601
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001602/* Queue-specific initialisation
1603 * This used to be done in xennet_create_dev() but must now
1604 * be run per-queue.
1605 */
1606static int xennet_init_queue(struct netfront_queue *queue)
1607{
1608 unsigned short i;
1609 int err = 0;
1610
1611 spin_lock_init(&queue->tx_lock);
1612 spin_lock_init(&queue->rx_lock);
1613
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001614 init_timer(&queue->rx_refill_timer);
1615 queue->rx_refill_timer.data = (unsigned long)queue;
1616 queue->rx_refill_timer.function = rx_refill_timeout;
1617
Wei Liu8b715012014-06-04 10:30:47 +01001618 snprintf(queue->name, sizeof(queue->name), "%s-q%u",
1619 queue->info->netdev->name, queue->id);
1620
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001621 /* Initialise tx_skbs as a free chain containing every entry. */
1622 queue->tx_skb_freelist = 0;
1623 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1624 skb_entry_set_link(&queue->tx_skbs[i], i+1);
1625 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1626 queue->grant_tx_page[i] = NULL;
1627 }
1628
1629 /* Clear out rx_skbs */
1630 for (i = 0; i < NET_RX_RING_SIZE; i++) {
1631 queue->rx_skbs[i] = NULL;
1632 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
1633 }
1634
1635 /* A grant for every tx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001636 if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001637 &queue->gref_tx_head) < 0) {
1638 pr_alert("can't alloc tx grant refs\n");
1639 err = -ENOMEM;
1640 goto exit;
1641 }
1642
1643 /* A grant for every rx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001644 if (gnttab_alloc_grant_references(NET_RX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001645 &queue->gref_rx_head) < 0) {
1646 pr_alert("can't alloc rx grant refs\n");
1647 err = -ENOMEM;
1648 goto exit_free_tx;
1649 }
1650
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001651 return 0;
1652
1653 exit_free_tx:
1654 gnttab_free_grant_references(queue->gref_tx_head);
1655 exit:
1656 return err;
1657}
1658
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001659static int write_queue_xenstore_keys(struct netfront_queue *queue,
1660 struct xenbus_transaction *xbt, int write_hierarchical)
1661{
1662 /* Write the queue-specific keys into XenStore in the traditional
1663 * way for a single queue, or in a queue subkeys for multiple
1664 * queues.
1665 */
1666 struct xenbus_device *dev = queue->info->xbdev;
1667 int err;
1668 const char *message;
1669 char *path;
1670 size_t pathsize;
1671
1672 /* Choose the correct place to write the keys */
1673 if (write_hierarchical) {
1674 pathsize = strlen(dev->nodename) + 10;
1675 path = kzalloc(pathsize, GFP_KERNEL);
1676 if (!path) {
1677 err = -ENOMEM;
1678 message = "out of memory while writing ring references";
1679 goto error;
1680 }
1681 snprintf(path, pathsize, "%s/queue-%u",
1682 dev->nodename, queue->id);
1683 } else {
1684 path = (char *)dev->nodename;
1685 }
1686
1687 /* Write ring references */
1688 err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u",
1689 queue->tx_ring_ref);
1690 if (err) {
1691 message = "writing tx-ring-ref";
1692 goto error;
1693 }
1694
1695 err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u",
1696 queue->rx_ring_ref);
1697 if (err) {
1698 message = "writing rx-ring-ref";
1699 goto error;
1700 }
1701
1702 /* Write event channels; taking into account both shared
1703 * and split event channel scenarios.
1704 */
1705 if (queue->tx_evtchn == queue->rx_evtchn) {
1706 /* Shared event channel */
1707 err = xenbus_printf(*xbt, path,
1708 "event-channel", "%u", queue->tx_evtchn);
1709 if (err) {
1710 message = "writing event-channel";
1711 goto error;
1712 }
1713 } else {
1714 /* Split event channels */
1715 err = xenbus_printf(*xbt, path,
1716 "event-channel-tx", "%u", queue->tx_evtchn);
1717 if (err) {
1718 message = "writing event-channel-tx";
1719 goto error;
1720 }
1721
1722 err = xenbus_printf(*xbt, path,
1723 "event-channel-rx", "%u", queue->rx_evtchn);
1724 if (err) {
1725 message = "writing event-channel-rx";
1726 goto error;
1727 }
1728 }
1729
1730 if (write_hierarchical)
1731 kfree(path);
1732 return 0;
1733
1734error:
1735 if (write_hierarchical)
1736 kfree(path);
1737 xenbus_dev_fatal(dev, err, "%s", message);
1738 return err;
1739}
1740
David Vrabelce587252014-06-18 10:47:28 +01001741static void xennet_destroy_queues(struct netfront_info *info)
1742{
1743 unsigned int i;
1744
1745 rtnl_lock();
1746
1747 for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
1748 struct netfront_queue *queue = &info->queues[i];
1749
1750 if (netif_running(info->netdev))
1751 napi_disable(&queue->napi);
1752 netif_napi_del(&queue->napi);
1753 }
1754
1755 rtnl_unlock();
1756
1757 kfree(info->queues);
1758 info->queues = NULL;
1759}
1760
1761static int xennet_create_queues(struct netfront_info *info,
1762 unsigned int num_queues)
1763{
1764 unsigned int i;
1765 int ret;
1766
1767 info->queues = kcalloc(num_queues, sizeof(struct netfront_queue),
1768 GFP_KERNEL);
1769 if (!info->queues)
1770 return -ENOMEM;
1771
1772 rtnl_lock();
1773
1774 for (i = 0; i < num_queues; i++) {
1775 struct netfront_queue *queue = &info->queues[i];
1776
1777 queue->id = i;
1778 queue->info = info;
1779
1780 ret = xennet_init_queue(queue);
1781 if (ret < 0) {
David Vrabel69cb8522014-07-31 17:38:24 +01001782 dev_warn(&info->netdev->dev,
1783 "only created %d queues\n", i);
David Vrabelce587252014-06-18 10:47:28 +01001784 num_queues = i;
1785 break;
1786 }
1787
1788 netif_napi_add(queue->info->netdev, &queue->napi,
1789 xennet_poll, 64);
1790 if (netif_running(info->netdev))
1791 napi_enable(&queue->napi);
1792 }
1793
1794 netif_set_real_num_tx_queues(info->netdev, num_queues);
1795
1796 rtnl_unlock();
1797
1798 if (num_queues == 0) {
1799 dev_err(&info->netdev->dev, "no queues\n");
1800 return -EINVAL;
1801 }
1802 return 0;
1803}
1804
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001805/* Common code used when first setting up, and when resuming. */
Ian Campbellf502bf22010-08-18 23:27:49 +00001806static int talk_to_netback(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001807 struct netfront_info *info)
1808{
1809 const char *message;
1810 struct xenbus_transaction xbt;
1811 int err;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001812 unsigned int feature_split_evtchn;
1813 unsigned int i = 0;
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001814 unsigned int max_queues = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001815 struct netfront_queue *queue = NULL;
1816 unsigned int num_queues = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001817
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001818 info->netdev->irq = 0;
1819
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001820 /* Check if backend supports multiple queues */
1821 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1822 "multi-queue-max-queues", "%u", &max_queues);
1823 if (err < 0)
1824 max_queues = 1;
1825 num_queues = min(max_queues, xennet_max_queues);
1826
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001827 /* Check feature-split-event-channels */
1828 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1829 "feature-split-event-channels", "%u",
1830 &feature_split_evtchn);
1831 if (err < 0)
1832 feature_split_evtchn = 0;
1833
1834 /* Read mac addr. */
1835 err = xen_net_read_mac(dev, info->netdev->dev_addr);
1836 if (err) {
1837 xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001838 goto out;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001839 }
1840
David Vrabelce587252014-06-18 10:47:28 +01001841 if (info->queues)
1842 xennet_destroy_queues(info);
1843
1844 err = xennet_create_queues(info, num_queues);
1845 if (err < 0)
1846 goto destroy_ring;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001847
1848 /* Create shared ring, alloc event channel -- for each queue */
1849 for (i = 0; i < num_queues; ++i) {
1850 queue = &info->queues[i];
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001851 err = setup_netfront(dev, queue, feature_split_evtchn);
1852 if (err) {
David Vrabelce587252014-06-18 10:47:28 +01001853 /* setup_netfront() will tidy up the current
1854 * queue on error, but we need to clean up
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001855 * those already allocated.
1856 */
1857 if (i > 0) {
1858 rtnl_lock();
1859 netif_set_real_num_tx_queues(info->netdev, i);
1860 rtnl_unlock();
1861 goto destroy_ring;
1862 } else {
1863 goto out;
1864 }
1865 }
1866 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001867
1868again:
1869 err = xenbus_transaction_start(&xbt);
1870 if (err) {
1871 xenbus_dev_fatal(dev, err, "starting transaction");
1872 goto destroy_ring;
1873 }
1874
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001875 if (num_queues == 1) {
1876 err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
1877 if (err)
1878 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001879 } else {
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001880 /* Write the number of queues */
1881 err = xenbus_printf(xbt, dev->nodename, "multi-queue-num-queues",
1882 "%u", num_queues);
Wei Liud634bf22013-05-22 06:34:46 +00001883 if (err) {
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001884 message = "writing multi-queue-num-queues";
1885 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001886 }
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001887
1888 /* Write the keys for each queue */
1889 for (i = 0; i < num_queues; ++i) {
1890 queue = &info->queues[i];
1891 err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */
1892 if (err)
1893 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001894 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001895 }
1896
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001897 /* The remaining keys are not queue-specific */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001898 err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
1899 1);
1900 if (err) {
1901 message = "writing request-rx-copy";
1902 goto abort_transaction;
1903 }
1904
1905 err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
1906 if (err) {
1907 message = "writing feature-rx-notify";
1908 goto abort_transaction;
1909 }
1910
1911 err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
1912 if (err) {
1913 message = "writing feature-sg";
1914 goto abort_transaction;
1915 }
1916
1917 err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
1918 if (err) {
1919 message = "writing feature-gso-tcpv4";
1920 goto abort_transaction;
1921 }
1922
Paul Durrant2c0057d2014-01-15 17:30:33 +00001923 err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1");
1924 if (err) {
1925 message = "writing feature-gso-tcpv6";
1926 goto abort_transaction;
1927 }
1928
1929 err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload",
1930 "1");
1931 if (err) {
1932 message = "writing feature-ipv6-csum-offload";
1933 goto abort_transaction;
1934 }
1935
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001936 err = xenbus_transaction_end(xbt, 0);
1937 if (err) {
1938 if (err == -EAGAIN)
1939 goto again;
1940 xenbus_dev_fatal(dev, err, "completing transaction");
1941 goto destroy_ring;
1942 }
1943
1944 return 0;
1945
1946 abort_transaction:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001947 xenbus_dev_fatal(dev, err, "%s", message);
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001948abort_transaction_no_dev_fatal:
1949 xenbus_transaction_end(xbt, 1);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001950 destroy_ring:
1951 xennet_disconnect_backend(info);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001952 kfree(info->queues);
1953 info->queues = NULL;
1954 rtnl_lock();
1955 netif_set_real_num_tx_queues(info->netdev, 0);
David Vrabeldb8c8ab2014-07-31 17:38:22 +01001956 rtnl_unlock();
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001957 out:
1958 return err;
1959}
1960
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001961static int xennet_connect(struct net_device *dev)
1962{
1963 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001964 unsigned int num_queues = 0;
David Vrabela5b5dc32014-07-31 17:38:23 +01001965 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001966 unsigned int feature_rx_copy;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001967 unsigned int j = 0;
1968 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001969
1970 err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1971 "feature-rx-copy", "%u", &feature_rx_copy);
1972 if (err != 1)
1973 feature_rx_copy = 0;
1974
1975 if (!feature_rx_copy) {
1976 dev_info(&dev->dev,
Joe Perches898eb712007-10-18 03:06:30 -07001977 "backend does not support copying receive path\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001978 return -ENODEV;
1979 }
1980
Ian Campbellf502bf22010-08-18 23:27:49 +00001981 err = talk_to_netback(np->xbdev, np);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001982 if (err)
1983 return err;
1984
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001985 /* talk_to_netback() sets the correct number of queues */
1986 num_queues = dev->real_num_tx_queues;
1987
Ian Campbell1ba37c52011-05-24 21:56:02 +00001988 rtnl_lock();
Michał Mirosławfb507932011-03-31 01:01:35 +00001989 netdev_update_features(dev);
Ian Campbell1ba37c52011-05-24 21:56:02 +00001990 rtnl_unlock();
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001991
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001992 /*
David Vrabela5b5dc32014-07-31 17:38:23 +01001993 * All public and private state should now be sane. Get
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001994 * ready to start sending and receiving packets and give the driver
1995 * domain a kick because we've probably just requeued some
1996 * packets.
1997 */
1998 netif_carrier_on(np->netdev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001999 for (j = 0; j < num_queues; ++j) {
2000 queue = &np->queues[j];
David Vrabelf50b4072014-07-02 16:09:14 +01002001
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002002 notify_remote_via_irq(queue->tx_irq);
2003 if (queue->tx_irq != queue->rx_irq)
2004 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002005
David Vrabelf50b4072014-07-02 16:09:14 +01002006 spin_lock_irq(&queue->tx_lock);
2007 xennet_tx_buf_gc(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002008 spin_unlock_irq(&queue->tx_lock);
David Vrabelf50b4072014-07-02 16:09:14 +01002009
2010 spin_lock_bh(&queue->rx_lock);
2011 xennet_alloc_rx_buffers(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002012 spin_unlock_bh(&queue->rx_lock);
2013 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002014
2015 return 0;
2016}
2017
2018/**
2019 * Callback received when the backend's state changes.
2020 */
Ian Campbellf502bf22010-08-18 23:27:49 +00002021static void netback_changed(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002022 enum xenbus_state backend_state)
2023{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002024 struct netfront_info *np = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002025 struct net_device *netdev = np->netdev;
2026
2027 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
2028
2029 switch (backend_state) {
2030 case XenbusStateInitialising:
2031 case XenbusStateInitialised:
Noboru Iwamatsub78c9512009-10-13 17:22:29 -04002032 case XenbusStateReconfiguring:
2033 case XenbusStateReconfigured:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002034 case XenbusStateUnknown:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002035 break;
2036
2037 case XenbusStateInitWait:
2038 if (dev->state != XenbusStateInitialising)
2039 break;
2040 if (xennet_connect(netdev) != 0)
2041 break;
2042 xenbus_switch_state(dev, XenbusStateConnected);
Laszlo Ersek08e34eb2011-12-11 01:48:59 +00002043 break;
2044
2045 case XenbusStateConnected:
Amerigo Wangee89bab2012-08-09 22:14:56 +00002046 netdev_notify_peers(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002047 break;
2048
David Vrabelbce3ea82014-02-04 18:50:26 +00002049 case XenbusStateClosed:
2050 if (dev->state == XenbusStateClosed)
2051 break;
2052 /* Missed the backend's CLOSING state -- fallthrough */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002053 case XenbusStateClosing:
2054 xenbus_frontend_closed(dev);
2055 break;
2056 }
2057}
2058
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002059static const struct xennet_stat {
2060 char name[ETH_GSTRING_LEN];
2061 u16 offset;
2062} xennet_stats[] = {
2063 {
2064 "rx_gso_checksum_fixup",
2065 offsetof(struct netfront_info, rx_gso_checksum_fixup)
2066 },
2067};
2068
2069static int xennet_get_sset_count(struct net_device *dev, int string_set)
2070{
2071 switch (string_set) {
2072 case ETH_SS_STATS:
2073 return ARRAY_SIZE(xennet_stats);
2074 default:
2075 return -EINVAL;
2076 }
2077}
2078
2079static void xennet_get_ethtool_stats(struct net_device *dev,
2080 struct ethtool_stats *stats, u64 * data)
2081{
2082 void *np = netdev_priv(dev);
2083 int i;
2084
2085 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002086 data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset));
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002087}
2088
2089static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
2090{
2091 int i;
2092
2093 switch (stringset) {
2094 case ETH_SS_STATS:
2095 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
2096 memcpy(data + i * ETH_GSTRING_LEN,
2097 xennet_stats[i].name, ETH_GSTRING_LEN);
2098 break;
2099 }
2100}
2101
Stephen Hemminger0fc0b732009-09-02 01:03:33 -07002102static const struct ethtool_ops xennet_ethtool_ops =
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002103{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002104 .get_link = ethtool_op_get_link,
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002105
2106 .get_sset_count = xennet_get_sset_count,
2107 .get_ethtool_stats = xennet_get_ethtool_stats,
2108 .get_strings = xennet_get_strings,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002109};
2110
2111#ifdef CONFIG_SYSFS
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002112static ssize_t show_rxbuf(struct device *dev,
2113 struct device_attribute *attr, char *buf)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002114{
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002115 return sprintf(buf, "%lu\n", NET_RX_RING_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002116}
2117
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002118static ssize_t store_rxbuf(struct device *dev,
2119 struct device_attribute *attr,
2120 const char *buf, size_t len)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002121{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002122 char *endp;
2123 unsigned long target;
2124
2125 if (!capable(CAP_NET_ADMIN))
2126 return -EPERM;
2127
2128 target = simple_strtoul(buf, &endp, 0);
2129 if (endp == buf)
2130 return -EBADMSG;
2131
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002132 /* rxbuf_min and rxbuf_max are no longer configurable. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002133
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002134 return len;
2135}
2136
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002137static struct device_attribute xennet_attrs[] = {
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002138 __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf),
2139 __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf),
2140 __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL),
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002141};
2142
2143static int xennet_sysfs_addif(struct net_device *netdev)
2144{
2145 int i;
2146 int err;
2147
2148 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) {
2149 err = device_create_file(&netdev->dev,
2150 &xennet_attrs[i]);
2151 if (err)
2152 goto fail;
2153 }
2154 return 0;
2155
2156 fail:
2157 while (--i >= 0)
2158 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2159 return err;
2160}
2161
2162static void xennet_sysfs_delif(struct net_device *netdev)
2163{
2164 int i;
2165
2166 for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++)
2167 device_remove_file(&netdev->dev, &xennet_attrs[i]);
2168}
2169
2170#endif /* CONFIG_SYSFS */
2171
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002172static int xennet_remove(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002173{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002174 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002175 unsigned int num_queues = info->netdev->real_num_tx_queues;
2176 struct netfront_queue *queue = NULL;
2177 unsigned int i = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002178
2179 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2180
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002181 xennet_disconnect_backend(info);
2182
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002183 xennet_sysfs_delif(info->netdev);
2184
Ian Campbell6bc96d02012-06-25 22:48:41 +00002185 unregister_netdev(info->netdev);
2186
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002187 for (i = 0; i < num_queues; ++i) {
2188 queue = &info->queues[i];
2189 del_timer_sync(&queue->rx_refill_timer);
2190 }
2191
2192 if (num_queues) {
2193 kfree(info->queues);
2194 info->queues = NULL;
2195 }
Ian Campbell6bc96d02012-06-25 22:48:41 +00002196
stephen hemmingere00f85b2011-06-21 05:35:31 +00002197 free_percpu(info->stats);
2198
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002199 free_netdev(info->netdev);
2200
2201 return 0;
2202}
2203
David Vrabel95afae42014-09-08 17:30:41 +01002204static const struct xenbus_device_id netfront_ids[] = {
2205 { "vif" },
2206 { "" }
2207};
2208
2209static struct xenbus_driver netfront_driver = {
2210 .ids = netfront_ids,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002211 .probe = netfront_probe,
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002212 .remove = xennet_remove,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002213 .resume = netfront_resume,
Ian Campbellf502bf22010-08-18 23:27:49 +00002214 .otherend_changed = netback_changed,
David Vrabel95afae42014-09-08 17:30:41 +01002215};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002216
2217static int __init netif_init(void)
2218{
Jeremy Fitzhardinge6e833582008-08-19 13:16:17 -07002219 if (!xen_domain())
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002220 return -ENODEV;
2221
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -05002222 if (!xen_has_pv_nic_devices())
Igor Mammedovb9136d22012-03-21 15:08:38 +01002223 return -ENODEV;
2224
Joe Perches383eda32013-06-27 21:57:49 -07002225 pr_info("Initialising Xen virtual ethernet driver\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002226
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01002227 /* Allow as many queues as there are CPUs, by default */
2228 xennet_max_queues = num_online_cpus();
2229
Al Viroffb78a22008-11-22 17:38:14 +00002230 return xenbus_register_frontend(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002231}
2232module_init(netif_init);
2233
2234
2235static void __exit netif_exit(void)
2236{
Al Viroffb78a22008-11-22 17:38:14 +00002237 xenbus_unregister_driver(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002238}
2239module_exit(netif_exit);
2240
2241MODULE_DESCRIPTION("Xen virtual network device frontend");
2242MODULE_LICENSE("GPL");
Mark McLoughlind2f0c522008-04-02 10:54:05 -07002243MODULE_ALIAS("xen:vif");
Mark McLoughlin4f93f09b2008-04-02 10:54:06 -07002244MODULE_ALIAS("xennet");