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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
Jeremy Fitzhardinge1ccbf532009-10-06 15:11:14 -070048#include <xen/xen.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070049#include <xen/xenbus.h>
50#include <xen/events.h>
51#include <xen/page.h>
Igor Mammedovb9136d22012-03-21 15:08:38 +010052#include <xen/platform_pci.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070053#include <xen/grant_table.h>
54
55#include <xen/interface/io/netif.h>
56#include <xen/interface/memory.h>
57#include <xen/interface/grant_table.h>
58
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +010059/* Module parameters */
60static unsigned int xennet_max_queues;
61module_param_named(max_queues, xennet_max_queues, uint, 0644);
62MODULE_PARM_DESC(max_queues,
63 "Maximum number of queues per virtual interface");
64
Stephen Hemminger0fc0b732009-09-02 01:03:33 -070065static const struct ethtool_ops xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070066
67struct netfront_cb {
Ian Campbell36832432012-08-22 00:26:47 +000068 int pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070069};
70
71#define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb))
72
73#define RX_COPY_THRESHOLD 256
74
75#define GRANT_INVALID_REF 0
76
Julien Grall30c5d7f2015-04-10 14:42:21 +010077#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE)
78#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE)
David Vrabel1f3c2eb2014-10-22 11:17:06 +010079
80/* Minimum number of Rx slots (includes slot for GSO metadata). */
81#define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070082
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010083/* Queue name is interface name with "-qNNN" appended */
84#define QUEUE_NAME_SIZE (IFNAMSIZ + 6)
85
86/* IRQ name is queue name with "-tx" or "-rx" appended */
87#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3)
88
stephen hemmingere00f85b2011-06-21 05:35:31 +000089struct netfront_stats {
David Vrabel900e1832015-01-13 16:42:42 +000090 u64 packets;
91 u64 bytes;
stephen hemmingere00f85b2011-06-21 05:35:31 +000092 struct u64_stats_sync syncp;
93};
94
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +010095struct netfront_info;
96
97struct netfront_queue {
98 unsigned int id; /* Queue ID, 0-based */
99 char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */
100 struct netfront_info *info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700101
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700102 struct napi_struct napi;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700103
Wei Liud634bf22013-05-22 06:34:46 +0000104 /* Split event channels support, tx_* == rx_* when using
105 * single event channel.
106 */
107 unsigned int tx_evtchn, rx_evtchn;
108 unsigned int tx_irq, rx_irq;
109 /* Only used when split event channels support is enabled */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100110 char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */
111 char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700112
113 spinlock_t tx_lock;
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700114 struct xen_netif_tx_front_ring tx;
115 int tx_ring_ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700116
117 /*
118 * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries
119 * are linked from tx_skb_freelist through skb_entry.link.
120 *
121 * NB. Freelist index entries are always going to be less than
122 * PAGE_OFFSET, whereas pointers to skbs will always be equal or
123 * greater than PAGE_OFFSET: we use this property to distinguish
124 * them.
125 */
126 union skb_entry {
127 struct sk_buff *skb;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700128 unsigned long link;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700129 } tx_skbs[NET_TX_RING_SIZE];
130 grant_ref_t gref_tx_head;
131 grant_ref_t grant_tx_ref[NET_TX_RING_SIZE];
Annie Licefe0072014-01-28 11:35:42 +0800132 struct page *grant_tx_page[NET_TX_RING_SIZE];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700133 unsigned tx_skb_freelist;
134
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700135 spinlock_t rx_lock ____cacheline_aligned_in_smp;
136 struct xen_netif_rx_front_ring rx;
137 int rx_ring_ref;
138
Jeremy Fitzhardinge84284d32007-10-15 12:59:53 -0700139 struct timer_list rx_refill_timer;
140
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700141 struct sk_buff *rx_skbs[NET_RX_RING_SIZE];
142 grant_ref_t gref_rx_head;
143 grant_ref_t grant_rx_ref[NET_RX_RING_SIZE];
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100144};
145
146struct netfront_info {
147 struct list_head list;
148 struct net_device *netdev;
149
150 struct xenbus_device *xbdev;
151
152 /* Multi-queue support */
153 struct netfront_queue *queues;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000154
155 /* Statistics */
David Vrabel900e1832015-01-13 16:42:42 +0000156 struct netfront_stats __percpu *rx_stats;
157 struct netfront_stats __percpu *tx_stats;
stephen hemmingere00f85b2011-06-21 05:35:31 +0000158
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100159 atomic_t rx_gso_checksum_fixup;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700160};
161
162struct netfront_rx_info {
163 struct xen_netif_rx_response rx;
164 struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1];
165};
166
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700167static void skb_entry_set_link(union skb_entry *list, unsigned short id)
168{
169 list->link = id;
170}
171
172static int skb_entry_is_link(const union skb_entry *list)
173{
174 BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link));
Eric Dumazet807540b2010-09-23 05:40:09 +0000175 return (unsigned long)list->skb < PAGE_OFFSET;
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700176}
177
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700178/*
179 * Access macros for acquiring freeing slots in tx_skbs[].
180 */
181
182static void add_id_to_freelist(unsigned *head, union skb_entry *list,
183 unsigned short id)
184{
Isaku Yamahata1ffb40b2008-07-08 15:06:31 -0700185 skb_entry_set_link(&list[id], *head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700186 *head = id;
187}
188
189static unsigned short get_id_from_freelist(unsigned *head,
190 union skb_entry *list)
191{
192 unsigned int id = *head;
193 *head = list[id].link;
194 return id;
195}
196
197static int xennet_rxidx(RING_IDX idx)
198{
199 return idx & (NET_RX_RING_SIZE - 1);
200}
201
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100202static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700203 RING_IDX ri)
204{
205 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100206 struct sk_buff *skb = queue->rx_skbs[i];
207 queue->rx_skbs[i] = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700208 return skb;
209}
210
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100211static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700212 RING_IDX ri)
213{
214 int i = xennet_rxidx(ri);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100215 grant_ref_t ref = queue->grant_rx_ref[i];
216 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700217 return ref;
218}
219
220#ifdef CONFIG_SYSFS
Takashi Iwai27b917e2015-02-04 14:38:55 +0100221static const struct attribute_group xennet_dev_group;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700222#endif
223
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000224static bool xennet_can_sg(struct net_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700225{
Michał Mirosław3ad9b352011-11-16 14:05:33 +0000226 return dev->features & NETIF_F_SG;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700227}
228
229
230static void rx_refill_timeout(unsigned long data)
231{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100232 struct netfront_queue *queue = (struct netfront_queue *)data;
233 napi_schedule(&queue->napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700234}
235
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100236static int netfront_tx_slot_available(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700237{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100238 return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) <
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100239 (NET_TX_RING_SIZE - MAX_SKB_FRAGS - 2);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700240}
241
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100242static void xennet_maybe_wake_tx(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700243{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100244 struct net_device *dev = queue->info->netdev;
245 struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700246
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100247 if (unlikely(netif_tx_queue_stopped(dev_queue)) &&
248 netfront_tx_slot_available(queue) &&
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700249 likely(netif_running(dev)))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100250 netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700251}
252
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100253
254static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700255{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700256 struct sk_buff *skb;
257 struct page *page;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100258
259 skb = __netdev_alloc_skb(queue->info->netdev,
260 RX_COPY_THRESHOLD + NET_IP_ALIGN,
261 GFP_ATOMIC | __GFP_NOWARN);
262 if (unlikely(!skb))
263 return NULL;
264
265 page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
266 if (!page) {
267 kfree_skb(skb);
268 return NULL;
269 }
270 skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE);
271
272 /* Align ip header to a 16 bytes boundary */
273 skb_reserve(skb, NET_IP_ALIGN);
274 skb->dev = queue->info->netdev;
275
276 return skb;
277}
278
279
280static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
281{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100282 RING_IDX req_prod = queue->rx.req_prod_pvt;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100283 int notify;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700284
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100285 if (unlikely(!netif_carrier_ok(queue->info->netdev)))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700286 return;
287
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100288 for (req_prod = queue->rx.req_prod_pvt;
289 req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE;
290 req_prod++) {
291 struct sk_buff *skb;
292 unsigned short id;
293 grant_ref_t ref;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100294 struct page *page;
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100295 struct xen_netif_rx_request *req;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700296
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100297 skb = xennet_alloc_one_rx_buffer(queue);
298 if (!skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700299 break;
300
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100301 id = xennet_rxidx(req_prod);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700302
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100303 BUG_ON(queue->rx_skbs[id]);
304 queue->rx_skbs[id] = skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700305
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100306 ref = gnttab_claim_grant_reference(&queue->gref_rx_head);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700307 BUG_ON((signed short)ref < 0);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100308 queue->grant_rx_ref[id] = ref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700309
Julien Grall30c5d7f2015-04-10 14:42:21 +0100310 page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700311
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100312 req = RING_GET_REQUEST(&queue->rx, req_prod);
Julien Grall30c5d7f2015-04-10 14:42:21 +0100313 gnttab_page_grant_foreign_access_ref_one(ref,
314 queue->info->xbdev->otherend_id,
315 page,
316 0);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700317 req->id = id;
318 req->gref = ref;
319 }
320
David Vrabel1f3c2eb2014-10-22 11:17:06 +0100321 queue->rx.req_prod_pvt = req_prod;
322
323 /* Not enough requests? Try again later. */
324 if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN) {
325 mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
326 return;
327 }
328
Jeremy Fitzhardinge5dcddfa2007-08-07 14:56:42 -0700329 wmb(); /* barrier so backend seens requests */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700330
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100331 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700332 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100333 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700334}
335
336static int xennet_open(struct net_device *dev)
337{
338 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100339 unsigned int num_queues = dev->real_num_tx_queues;
340 unsigned int i = 0;
341 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700342
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100343 for (i = 0; i < num_queues; ++i) {
344 queue = &np->queues[i];
345 napi_enable(&queue->napi);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700346
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100347 spin_lock_bh(&queue->rx_lock);
348 if (netif_carrier_ok(dev)) {
349 xennet_alloc_rx_buffers(queue);
350 queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1;
351 if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))
352 napi_schedule(&queue->napi);
353 }
354 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700355 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700356
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100357 netif_tx_start_all_queues(dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700358
359 return 0;
360}
361
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100362static void xennet_tx_buf_gc(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700363{
364 RING_IDX cons, prod;
365 unsigned short id;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700366 struct sk_buff *skb;
367
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100368 BUG_ON(!netif_carrier_ok(queue->info->netdev));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700369
370 do {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100371 prod = queue->tx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700372 rmb(); /* Ensure we see responses up to 'rp'. */
373
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100374 for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700375 struct xen_netif_tx_response *txrsp;
376
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100377 txrsp = RING_GET_RESPONSE(&queue->tx, cons);
Ian Campbellf942dc22011-03-15 00:06:18 +0000378 if (txrsp->status == XEN_NETIF_RSP_NULL)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700379 continue;
380
381 id = txrsp->id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100382 skb = queue->tx_skbs[id].skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700383 if (unlikely(gnttab_query_foreign_access(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100384 queue->grant_tx_ref[id]) != 0)) {
Joe Perches383eda32013-06-27 21:57:49 -0700385 pr_alert("%s: warning -- grant still in use by backend domain\n",
386 __func__);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700387 BUG();
388 }
389 gnttab_end_foreign_access_ref(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100390 queue->grant_tx_ref[id], GNTMAP_readonly);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700391 gnttab_release_grant_reference(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100392 &queue->gref_tx_head, queue->grant_tx_ref[id]);
393 queue->grant_tx_ref[id] = GRANT_INVALID_REF;
394 queue->grant_tx_page[id] = NULL;
395 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700396 dev_kfree_skb_irq(skb);
397 }
398
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100399 queue->tx.rsp_cons = prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700400
401 /*
402 * Set a new event, then check for race with update of tx_cons.
403 * Note that it is essential to schedule a callback, no matter
404 * how few buffers are pending. Even if there is space in the
405 * transmit ring, higher layers may be blocked because too much
406 * data is outstanding: in such cases notification from Xen is
407 * likely to be the only kick that we'll get.
408 */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100409 queue->tx.sring->rsp_event =
410 prod + ((queue->tx.sring->req_prod - prod) >> 1) + 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700411 mb(); /* update shared area */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100412 } while ((cons == prod) && (prod != queue->tx.sring->rsp_prod));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700413
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100414 xennet_maybe_wake_tx(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700415}
416
Julien Grall30c5d7f2015-04-10 14:42:21 +0100417struct xennet_gnttab_make_txreq {
418 struct netfront_queue *queue;
419 struct sk_buff *skb;
420 struct page *page;
421 struct xen_netif_tx_request *tx; /* Last request */
422 unsigned int size;
423};
424
425static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset,
426 unsigned int len, void *data)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700427{
Julien Grall30c5d7f2015-04-10 14:42:21 +0100428 struct xennet_gnttab_make_txreq *info = data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700429 unsigned int id;
David Vrabela55e8bb2015-01-13 17:16:44 +0000430 struct xen_netif_tx_request *tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700431 grant_ref_t ref;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100432 /* convenient aliases */
433 struct page *page = info->page;
434 struct netfront_queue *queue = info->queue;
435 struct sk_buff *skb = info->skb;
David Vrabela55e8bb2015-01-13 17:16:44 +0000436
437 id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
438 tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
439 ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
440 BUG_ON((signed short)ref < 0);
441
Julien Grall30c5d7f2015-04-10 14:42:21 +0100442 gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
443 gfn, GNTMAP_readonly);
David Vrabela55e8bb2015-01-13 17:16:44 +0000444
445 queue->tx_skbs[id].skb = skb;
446 queue->grant_tx_page[id] = page;
447 queue->grant_tx_ref[id] = ref;
448
449 tx->id = id;
450 tx->gref = ref;
451 tx->offset = offset;
452 tx->size = len;
453 tx->flags = 0;
454
Julien Grall30c5d7f2015-04-10 14:42:21 +0100455 info->tx = tx;
456 info->size += tx->size;
457}
458
459static struct xen_netif_tx_request *xennet_make_first_txreq(
460 struct netfront_queue *queue, struct sk_buff *skb,
461 struct page *page, unsigned int offset, unsigned int len)
462{
463 struct xennet_gnttab_make_txreq info = {
464 .queue = queue,
465 .skb = skb,
466 .page = page,
467 .size = 0,
468 };
469
470 gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info);
471
472 return info.tx;
473}
474
475static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset,
476 unsigned int len, void *data)
477{
478 struct xennet_gnttab_make_txreq *info = data;
479
480 info->tx->flags |= XEN_NETTXF_more_data;
481 skb_get(info->skb);
482 xennet_tx_setup_grant(gfn, offset, len, data);
David Vrabela55e8bb2015-01-13 17:16:44 +0000483}
484
485static struct xen_netif_tx_request *xennet_make_txreqs(
486 struct netfront_queue *queue, struct xen_netif_tx_request *tx,
487 struct sk_buff *skb, struct page *page,
488 unsigned int offset, unsigned int len)
489{
Julien Grall30c5d7f2015-04-10 14:42:21 +0100490 struct xennet_gnttab_make_txreq info = {
491 .queue = queue,
492 .skb = skb,
493 .tx = tx,
494 };
495
David Vrabela55e8bb2015-01-13 17:16:44 +0000496 /* Skip unused frames from start of page */
497 page += offset >> PAGE_SHIFT;
498 offset &= ~PAGE_MASK;
499
500 while (len) {
Julien Grall30c5d7f2015-04-10 14:42:21 +0100501 info.page = page;
502 info.size = 0;
503
504 gnttab_foreach_grant_in_range(page, offset, len,
505 xennet_make_one_txreq,
506 &info);
507
David Vrabela55e8bb2015-01-13 17:16:44 +0000508 page++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700509 offset = 0;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100510 len -= info.size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700511 }
512
Julien Grall30c5d7f2015-04-10 14:42:21 +0100513 return info.tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700514}
515
Ian Campbellf36c3742012-11-21 02:02:16 +0000516/*
David Vrabele84448d2015-01-13 17:16:43 +0000517 * Count how many ring slots are required to send this skb. Each frag
518 * might be a compound page.
Ian Campbellf36c3742012-11-21 02:02:16 +0000519 */
David Vrabele84448d2015-01-13 17:16:43 +0000520static int xennet_count_skb_slots(struct sk_buff *skb)
Ian Campbellf36c3742012-11-21 02:02:16 +0000521{
522 int i, frags = skb_shinfo(skb)->nr_frags;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100523 int slots;
David Vrabele84448d2015-01-13 17:16:43 +0000524
Julien Grall30c5d7f2015-04-10 14:42:21 +0100525 slots = gnttab_count_grant(offset_in_page(skb->data),
526 skb_headlen(skb));
Ian Campbellf36c3742012-11-21 02:02:16 +0000527
528 for (i = 0; i < frags; i++) {
529 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
530 unsigned long size = skb_frag_size(frag);
531 unsigned long offset = frag->page_offset;
532
533 /* Skip unused frames from start of page */
534 offset &= ~PAGE_MASK;
535
Julien Grall30c5d7f2015-04-10 14:42:21 +0100536 slots += gnttab_count_grant(offset, size);
Ian Campbellf36c3742012-11-21 02:02:16 +0000537 }
538
Julien Grall30c5d7f2015-04-10 14:42:21 +0100539 return slots;
Ian Campbellf36c3742012-11-21 02:02:16 +0000540}
541
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100542static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb,
543 void *accel_priv, select_queue_fallback_t fallback)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100544{
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100545 unsigned int num_queues = dev->real_num_tx_queues;
546 u32 hash;
547 u16 queue_idx;
548
549 /* First, check if there is only one queue */
550 if (num_queues == 1) {
551 queue_idx = 0;
552 } else {
553 hash = skb_get_hash(skb);
554 queue_idx = hash % num_queues;
555 }
556
557 return queue_idx;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100558}
559
Julien Grall30c5d7f2015-04-10 14:42:21 +0100560#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)
561
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700562static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
563{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700564 struct netfront_info *np = netdev_priv(dev);
David Vrabel900e1832015-01-13 16:42:42 +0000565 struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats);
David Vrabela55e8bb2015-01-13 17:16:44 +0000566 struct xen_netif_tx_request *tx, *first_tx;
567 unsigned int i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700568 int notify;
Ian Campbellf36c3742012-11-21 02:02:16 +0000569 int slots;
David Vrabela55e8bb2015-01-13 17:16:44 +0000570 struct page *page;
571 unsigned int offset;
572 unsigned int len;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000573 unsigned long flags;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100574 struct netfront_queue *queue = NULL;
575 unsigned int num_queues = dev->real_num_tx_queues;
576 u16 queue_index;
577
578 /* Drop the packet if no queues are set up */
579 if (num_queues < 1)
580 goto drop;
581 /* Determine which queue to transmit this SKB on */
582 queue_index = skb_get_queue_mapping(skb);
583 queue = &np->queues[queue_index];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700584
Wei Liu9ecd1a72013-04-22 02:20:41 +0000585 /* If skb->len is too big for wire format, drop skb and alert
586 * user about misconfiguration.
587 */
588 if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
589 net_alert_ratelimited(
590 "xennet: skb->len = %u, too big for wire format\n",
591 skb->len);
592 goto drop;
593 }
594
David Vrabele84448d2015-01-13 17:16:43 +0000595 slots = xennet_count_skb_slots(skb);
Julien Grall30c5d7f2015-04-10 14:42:21 +0100596 if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) {
Zoltan Kiss97a6d1b2014-08-11 18:32:23 +0100597 net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n",
598 slots, skb->len);
599 if (skb_linearize(skb))
600 goto drop;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700601 }
602
David Vrabela55e8bb2015-01-13 17:16:44 +0000603 page = virt_to_page(skb->data);
604 offset = offset_in_page(skb->data);
605 len = skb_headlen(skb);
606
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100607 spin_lock_irqsave(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700608
609 if (unlikely(!netif_carrier_ok(dev) ||
Ian Campbellf36c3742012-11-21 02:02:16 +0000610 (slots > 1 && !xennet_can_sg(dev)) ||
Johannes Berg8b86a612015-04-17 15:45:04 +0200611 netif_needs_gso(skb, netif_skb_features(skb)))) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100612 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700613 goto drop;
614 }
615
David Vrabela55e8bb2015-01-13 17:16:44 +0000616 /* First request for the linear area. */
Julien Grall30c5d7f2015-04-10 14:42:21 +0100617 first_tx = tx = xennet_make_first_txreq(queue, skb,
618 page, offset, len);
619 offset += tx->size;
620 if (offset == PAGE_SIZE) {
621 page++;
622 offset = 0;
623 }
David Vrabela55e8bb2015-01-13 17:16:44 +0000624 len -= tx->size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700625
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700626 if (skb->ip_summed == CHECKSUM_PARTIAL)
627 /* local packet? */
Ian Campbellf942dc22011-03-15 00:06:18 +0000628 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700629 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
630 /* remote but checksummed. */
Ian Campbellf942dc22011-03-15 00:06:18 +0000631 tx->flags |= XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700632
David Vrabela55e8bb2015-01-13 17:16:44 +0000633 /* Optional extra info after the first request. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700634 if (skb_shinfo(skb)->gso_size) {
635 struct xen_netif_extra_info *gso;
636
637 gso = (struct xen_netif_extra_info *)
David Vrabela55e8bb2015-01-13 17:16:44 +0000638 RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700639
Wei Liue2d617c2013-03-25 01:08:17 +0000640 tx->flags |= XEN_NETTXF_extra_info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700641
642 gso->u.gso.size = skb_shinfo(skb)->gso_size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000643 gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ?
644 XEN_NETIF_GSO_TYPE_TCPV6 :
645 XEN_NETIF_GSO_TYPE_TCPV4;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700646 gso->u.gso.pad = 0;
647 gso->u.gso.features = 0;
648
649 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
650 gso->flags = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700651 }
652
David Vrabela55e8bb2015-01-13 17:16:44 +0000653 /* Requests for the rest of the linear area. */
654 tx = xennet_make_txreqs(queue, tx, skb, page, offset, len);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700655
David Vrabela55e8bb2015-01-13 17:16:44 +0000656 /* Requests for all the frags. */
657 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
658 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
659 tx = xennet_make_txreqs(queue, tx, skb,
660 skb_frag_page(frag), frag->page_offset,
661 skb_frag_size(frag));
662 }
663
664 /* First request has the packet length. */
665 first_tx->size = skb->len;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700666
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100667 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700668 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100669 notify_remote_via_irq(queue->tx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700670
David Vrabel900e1832015-01-13 16:42:42 +0000671 u64_stats_update_begin(&tx_stats->syncp);
672 tx_stats->bytes += skb->len;
673 tx_stats->packets++;
674 u64_stats_update_end(&tx_stats->syncp);
Jeremy Fitzhardinge10a273a2007-08-13 12:54:37 -0700675
676 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100677 xennet_tx_buf_gc(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700678
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100679 if (!netfront_tx_slot_available(queue))
680 netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700681
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100682 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700683
Patrick McHardy6ed10652009-06-23 06:03:08 +0000684 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700685
686 drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700687 dev->stats.tx_dropped++;
Eric W. Biederman979de8a2014-03-15 18:33:04 -0700688 dev_kfree_skb_any(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000689 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700690}
691
692static int xennet_close(struct net_device *dev)
693{
694 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100695 unsigned int num_queues = dev->real_num_tx_queues;
696 unsigned int i;
697 struct netfront_queue *queue;
698 netif_tx_stop_all_queues(np->netdev);
699 for (i = 0; i < num_queues; ++i) {
700 queue = &np->queues[i];
701 napi_disable(&queue->napi);
702 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700703 return 0;
704}
705
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100706static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700707 grant_ref_t ref)
708{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100709 int new = xennet_rxidx(queue->rx.req_prod_pvt);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700710
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100711 BUG_ON(queue->rx_skbs[new]);
712 queue->rx_skbs[new] = skb;
713 queue->grant_rx_ref[new] = ref;
714 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
715 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
716 queue->rx.req_prod_pvt++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700717}
718
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100719static int xennet_get_extras(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700720 struct xen_netif_extra_info *extras,
721 RING_IDX rp)
722
723{
724 struct xen_netif_extra_info *extra;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100725 struct device *dev = &queue->info->netdev->dev;
726 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700727 int err = 0;
728
729 do {
730 struct sk_buff *skb;
731 grant_ref_t ref;
732
733 if (unlikely(cons + 1 == rp)) {
734 if (net_ratelimit())
735 dev_warn(dev, "Missing extra info\n");
736 err = -EBADR;
737 break;
738 }
739
740 extra = (struct xen_netif_extra_info *)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100741 RING_GET_RESPONSE(&queue->rx, ++cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700742
743 if (unlikely(!extra->type ||
744 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
745 if (net_ratelimit())
746 dev_warn(dev, "Invalid extra type: %d\n",
747 extra->type);
748 err = -EINVAL;
749 } else {
750 memcpy(&extras[extra->type - 1], extra,
751 sizeof(*extra));
752 }
753
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100754 skb = xennet_get_rx_skb(queue, cons);
755 ref = xennet_get_rx_ref(queue, cons);
756 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700757 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
758
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100759 queue->rx.rsp_cons = cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700760 return err;
761}
762
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100763static int xennet_get_responses(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700764 struct netfront_rx_info *rinfo, RING_IDX rp,
765 struct sk_buff_head *list)
766{
767 struct xen_netif_rx_response *rx = &rinfo->rx;
768 struct xen_netif_extra_info *extras = rinfo->extras;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100769 struct device *dev = &queue->info->netdev->dev;
770 RING_IDX cons = queue->rx.rsp_cons;
771 struct sk_buff *skb = xennet_get_rx_skb(queue, cons);
772 grant_ref_t ref = xennet_get_rx_ref(queue, cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700773 int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
Wei Liu7158ff62013-03-25 01:08:19 +0000774 int slots = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700775 int err = 0;
776 unsigned long ret;
777
Ian Campbellf942dc22011-03-15 00:06:18 +0000778 if (rx->flags & XEN_NETRXF_extra_info) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100779 err = xennet_get_extras(queue, extras, rp);
780 cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700781 }
782
783 for (;;) {
784 if (unlikely(rx->status < 0 ||
Julien Grall30c5d7f2015-04-10 14:42:21 +0100785 rx->offset + rx->status > XEN_PAGE_SIZE)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700786 if (net_ratelimit())
Julien Grall6c101272015-06-16 20:10:46 +0100787 dev_warn(dev, "rx->offset: %u, size: %d\n",
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700788 rx->offset, rx->status);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100789 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700790 err = -EINVAL;
791 goto next;
792 }
793
794 /*
795 * This definitely indicates a bug, either in this driver or in
796 * the backend driver. In future this should flag the bad
Wei Liu697089d2013-04-22 02:20:40 +0000797 * situation to the system controller to reboot the backend.
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700798 */
799 if (ref == GRANT_INVALID_REF) {
800 if (net_ratelimit())
801 dev_warn(dev, "Bad rx response id %d.\n",
802 rx->id);
803 err = -EINVAL;
804 goto next;
805 }
806
807 ret = gnttab_end_foreign_access_ref(ref, 0);
808 BUG_ON(!ret);
809
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100810 gnttab_release_grant_reference(&queue->gref_rx_head, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700811
812 __skb_queue_tail(list, skb);
813
814next:
Ian Campbellf942dc22011-03-15 00:06:18 +0000815 if (!(rx->flags & XEN_NETRXF_more_data))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700816 break;
817
Wei Liu7158ff62013-03-25 01:08:19 +0000818 if (cons + slots == rp) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700819 if (net_ratelimit())
Wei Liu7158ff62013-03-25 01:08:19 +0000820 dev_warn(dev, "Need more slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700821 err = -ENOENT;
822 break;
823 }
824
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100825 rx = RING_GET_RESPONSE(&queue->rx, cons + slots);
826 skb = xennet_get_rx_skb(queue, cons + slots);
827 ref = xennet_get_rx_ref(queue, cons + slots);
Wei Liu7158ff62013-03-25 01:08:19 +0000828 slots++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700829 }
830
Wei Liu7158ff62013-03-25 01:08:19 +0000831 if (unlikely(slots > max)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700832 if (net_ratelimit())
Wei Liu697089d2013-04-22 02:20:40 +0000833 dev_warn(dev, "Too many slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700834 err = -E2BIG;
835 }
836
837 if (unlikely(err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100838 queue->rx.rsp_cons = cons + slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700839
840 return err;
841}
842
843static int xennet_set_skb_gso(struct sk_buff *skb,
844 struct xen_netif_extra_info *gso)
845{
846 if (!gso->u.gso.size) {
847 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700848 pr_warn("GSO size must not be zero\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700849 return -EINVAL;
850 }
851
Paul Durrant2c0057d2014-01-15 17:30:33 +0000852 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
853 gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700854 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700855 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700856 return -EINVAL;
857 }
858
859 skb_shinfo(skb)->gso_size = gso->u.gso.size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000860 skb_shinfo(skb)->gso_type =
861 (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
862 SKB_GSO_TCPV4 :
863 SKB_GSO_TCPV6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700864
865 /* Header must be checked, and gso_segs computed. */
866 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
867 skb_shinfo(skb)->gso_segs = 0;
868
869 return 0;
870}
871
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100872static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700873 struct sk_buff *skb,
874 struct sk_buff_head *list)
875{
876 struct skb_shared_info *shinfo = skb_shinfo(skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100877 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700878 struct sk_buff *nskb;
879
880 while ((nskb = __skb_dequeue(list))) {
881 struct xen_netif_rx_response *rx =
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100882 RING_GET_RESPONSE(&queue->rx, ++cons);
Ian Campbell01c68022011-10-05 00:28:47 +0000883 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700884
Jan Beulich093b9c72013-07-17 08:09:37 +0100885 if (shinfo->nr_frags == MAX_SKB_FRAGS) {
886 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700887
Jan Beulich093b9c72013-07-17 08:09:37 +0100888 BUG_ON(pull_to <= skb_headlen(skb));
889 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
890 }
891 BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
892
893 skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
894 rx->offset, rx->status, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700895
896 skb_shinfo(nskb)->nr_frags = 0;
897 kfree_skb(nskb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700898 }
899
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700900 return cons;
901}
902
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000903static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700904{
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000905 bool recalculate_partial_csum = false;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000906
907 /*
908 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
909 * peers can fail to set NETRXF_csum_blank when sending a GSO
910 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
911 * recalculate the partial checksum.
912 */
913 if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
914 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100915 atomic_inc(&np->rx_gso_checksum_fixup);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000916 skb->ip_summed = CHECKSUM_PARTIAL;
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000917 recalculate_partial_csum = true;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000918 }
919
920 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
921 if (skb->ip_summed != CHECKSUM_PARTIAL)
922 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700923
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000924 return skb_checksum_setup(skb, recalculate_partial_csum);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700925}
926
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100927static int handle_incoming_queue(struct netfront_queue *queue,
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700928 struct sk_buff_head *rxq)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700929{
David Vrabel900e1832015-01-13 16:42:42 +0000930 struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700931 int packets_dropped = 0;
932 struct sk_buff *skb;
933
934 while ((skb = __skb_dequeue(rxq)) != NULL) {
Ian Campbell36832432012-08-22 00:26:47 +0000935 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700936
Jan Beulich093b9c72013-07-17 08:09:37 +0100937 if (pull_to > skb_headlen(skb))
938 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700939
940 /* Ethernet work: Delayed to here as it peeks the header. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100941 skb->protocol = eth_type_trans(skb, queue->info->netdev);
Wei Liud554f732014-02-19 18:48:34 +0000942 skb_reset_network_header(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700943
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100944 if (checksum_setup(queue->info->netdev, skb)) {
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000945 kfree_skb(skb);
946 packets_dropped++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100947 queue->info->netdev->stats.rx_errors++;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000948 continue;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700949 }
950
David Vrabel900e1832015-01-13 16:42:42 +0000951 u64_stats_update_begin(&rx_stats->syncp);
952 rx_stats->packets++;
953 rx_stats->bytes += skb->len;
954 u64_stats_update_end(&rx_stats->syncp);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700955
956 /* Pass it up. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100957 napi_gro_receive(&queue->napi, skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700958 }
959
960 return packets_dropped;
961}
962
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700963static int xennet_poll(struct napi_struct *napi, int budget)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700964{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100965 struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
966 struct net_device *dev = queue->info->netdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700967 struct sk_buff *skb;
968 struct netfront_rx_info rinfo;
969 struct xen_netif_rx_response *rx = &rinfo.rx;
970 struct xen_netif_extra_info *extras = rinfo.extras;
971 RING_IDX i, rp;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700972 int work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700973 struct sk_buff_head rxq;
974 struct sk_buff_head errq;
975 struct sk_buff_head tmpq;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700976 int err;
977
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100978 spin_lock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700979
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700980 skb_queue_head_init(&rxq);
981 skb_queue_head_init(&errq);
982 skb_queue_head_init(&tmpq);
983
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100984 rp = queue->rx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700985 rmb(); /* Ensure we see queued responses up to 'rp'. */
986
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100987 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700988 work_done = 0;
989 while ((i != rp) && (work_done < budget)) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100990 memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700991 memset(extras, 0, sizeof(rinfo.extras));
992
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100993 err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700994
995 if (unlikely(err)) {
996err:
997 while ((skb = __skb_dequeue(&tmpq)))
998 __skb_queue_tail(&errq, skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700999 dev->stats.rx_errors++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001000 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001001 continue;
1002 }
1003
1004 skb = __skb_dequeue(&tmpq);
1005
1006 if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
1007 struct xen_netif_extra_info *gso;
1008 gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
1009
1010 if (unlikely(xennet_set_skb_gso(skb, gso))) {
1011 __skb_queue_head(&tmpq, skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001012 queue->rx.rsp_cons += skb_queue_len(&tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001013 goto err;
1014 }
1015 }
1016
Ian Campbell36832432012-08-22 00:26:47 +00001017 NETFRONT_SKB_CB(skb)->pull_to = rx->status;
1018 if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
1019 NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001020
Ian Campbell36832432012-08-22 00:26:47 +00001021 skb_shinfo(skb)->frags[0].page_offset = rx->offset;
1022 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1023 skb->data_len = rx->status;
Jan Beulich093b9c72013-07-17 08:09:37 +01001024 skb->len += rx->status;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001025
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001026 i = xennet_fill_frags(queue, skb, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001027
Ian Campbellf942dc22011-03-15 00:06:18 +00001028 if (rx->flags & XEN_NETRXF_csum_blank)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001029 skb->ip_summed = CHECKSUM_PARTIAL;
Ian Campbellf942dc22011-03-15 00:06:18 +00001030 else if (rx->flags & XEN_NETRXF_data_validated)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001031 skb->ip_summed = CHECKSUM_UNNECESSARY;
1032
1033 __skb_queue_tail(&rxq, skb);
1034
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001035 queue->rx.rsp_cons = ++i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001036 work_done++;
1037 }
1038
Wang Chen56cfe5d2008-05-22 18:09:06 +08001039 __skb_queue_purge(&errq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001040
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001041 work_done -= handle_incoming_queue(queue, &rxq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001042
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001043 xennet_alloc_rx_buffers(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001044
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001045 if (work_done < budget) {
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001046 int more_to_do = 0;
1047
David Vrabel6a6dc082014-12-16 18:59:46 +00001048 napi_complete(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001049
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001050 RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
David Vrabel6a6dc082014-12-16 18:59:46 +00001051 if (more_to_do)
1052 napi_schedule(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001053 }
1054
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001055 spin_unlock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001056
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001057 return work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001058}
1059
1060static int xennet_change_mtu(struct net_device *dev, int mtu)
1061{
Jonathan Davies0c368202015-03-31 11:05:15 +01001062 int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001063
1064 if (mtu > max)
1065 return -EINVAL;
1066 dev->mtu = mtu;
1067 return 0;
1068}
1069
stephen hemmingere00f85b2011-06-21 05:35:31 +00001070static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
1071 struct rtnl_link_stats64 *tot)
1072{
1073 struct netfront_info *np = netdev_priv(dev);
1074 int cpu;
1075
1076 for_each_possible_cpu(cpu) {
David Vrabel900e1832015-01-13 16:42:42 +00001077 struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu);
1078 struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu);
stephen hemmingere00f85b2011-06-21 05:35:31 +00001079 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1080 unsigned int start;
1081
1082 do {
David Vrabel900e1832015-01-13 16:42:42 +00001083 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
1084 tx_packets = tx_stats->packets;
1085 tx_bytes = tx_stats->bytes;
1086 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
stephen hemmingere00f85b2011-06-21 05:35:31 +00001087
David Vrabel900e1832015-01-13 16:42:42 +00001088 do {
1089 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
1090 rx_packets = rx_stats->packets;
1091 rx_bytes = rx_stats->bytes;
1092 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
stephen hemmingere00f85b2011-06-21 05:35:31 +00001093
1094 tot->rx_packets += rx_packets;
1095 tot->tx_packets += tx_packets;
1096 tot->rx_bytes += rx_bytes;
1097 tot->tx_bytes += tx_bytes;
1098 }
1099
1100 tot->rx_errors = dev->stats.rx_errors;
1101 tot->tx_dropped = dev->stats.tx_dropped;
1102
1103 return tot;
1104}
1105
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001106static void xennet_release_tx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001107{
1108 struct sk_buff *skb;
1109 int i;
1110
1111 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1112 /* Skip over entries which are actually freelist references */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001113 if (skb_entry_is_link(&queue->tx_skbs[i]))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001114 continue;
1115
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001116 skb = queue->tx_skbs[i].skb;
1117 get_page(queue->grant_tx_page[i]);
1118 gnttab_end_foreign_access(queue->grant_tx_ref[i],
Annie Licefe0072014-01-28 11:35:42 +08001119 GNTMAP_readonly,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001120 (unsigned long)page_address(queue->grant_tx_page[i]));
1121 queue->grant_tx_page[i] = NULL;
1122 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1123 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001124 dev_kfree_skb_irq(skb);
1125 }
1126}
1127
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001128static void xennet_release_rx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001129{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001130 int id, ref;
1131
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001132 spin_lock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001133
1134 for (id = 0; id < NET_RX_RING_SIZE; id++) {
Annie Licefe0072014-01-28 11:35:42 +08001135 struct sk_buff *skb;
1136 struct page *page;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001137
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001138 skb = queue->rx_skbs[id];
Annie Licefe0072014-01-28 11:35:42 +08001139 if (!skb)
1140 continue;
1141
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001142 ref = queue->grant_rx_ref[id];
Annie Licefe0072014-01-28 11:35:42 +08001143 if (ref == GRANT_INVALID_REF)
1144 continue;
1145
1146 page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
1147
1148 /* gnttab_end_foreign_access() needs a page ref until
1149 * foreign access is ended (which may be deferred).
1150 */
1151 get_page(page);
1152 gnttab_end_foreign_access(ref, 0,
1153 (unsigned long)page_address(page));
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001154 queue->grant_rx_ref[id] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001155
Annie Licefe0072014-01-28 11:35:42 +08001156 kfree_skb(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001157 }
1158
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001159 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001160}
1161
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001162static netdev_features_t xennet_fix_features(struct net_device *dev,
1163 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001164{
1165 struct netfront_info *np = netdev_priv(dev);
1166 int val;
1167
1168 if (features & NETIF_F_SG) {
1169 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
1170 "%d", &val) < 0)
1171 val = 0;
1172
1173 if (!val)
1174 features &= ~NETIF_F_SG;
1175 }
1176
Paul Durrant2c0057d2014-01-15 17:30:33 +00001177 if (features & NETIF_F_IPV6_CSUM) {
1178 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1179 "feature-ipv6-csum-offload", "%d", &val) < 0)
1180 val = 0;
1181
1182 if (!val)
1183 features &= ~NETIF_F_IPV6_CSUM;
1184 }
1185
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001186 if (features & NETIF_F_TSO) {
1187 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1188 "feature-gso-tcpv4", "%d", &val) < 0)
1189 val = 0;
1190
1191 if (!val)
1192 features &= ~NETIF_F_TSO;
1193 }
1194
Paul Durrant2c0057d2014-01-15 17:30:33 +00001195 if (features & NETIF_F_TSO6) {
1196 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1197 "feature-gso-tcpv6", "%d", &val) < 0)
1198 val = 0;
1199
1200 if (!val)
1201 features &= ~NETIF_F_TSO6;
1202 }
1203
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001204 return features;
1205}
1206
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001207static int xennet_set_features(struct net_device *dev,
1208 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001209{
1210 if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
1211 netdev_info(dev, "Reducing MTU because no SG offload");
1212 dev->mtu = ETH_DATA_LEN;
1213 }
1214
1215 return 0;
1216}
1217
Wei Liud634bf22013-05-22 06:34:46 +00001218static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001219{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001220 struct netfront_queue *queue = dev_id;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001221 unsigned long flags;
1222
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001223 spin_lock_irqsave(&queue->tx_lock, flags);
1224 xennet_tx_buf_gc(queue);
1225 spin_unlock_irqrestore(&queue->tx_lock, flags);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001226
1227 return IRQ_HANDLED;
1228}
1229
Wei Liud634bf22013-05-22 06:34:46 +00001230static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1231{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001232 struct netfront_queue *queue = dev_id;
1233 struct net_device *dev = queue->info->netdev;
Wei Liud634bf22013-05-22 06:34:46 +00001234
1235 if (likely(netif_carrier_ok(dev) &&
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001236 RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
David Vrabel76541862014-06-18 10:47:27 +01001237 napi_schedule(&queue->napi);
Wei Liud634bf22013-05-22 06:34:46 +00001238
1239 return IRQ_HANDLED;
1240}
1241
1242static irqreturn_t xennet_interrupt(int irq, void *dev_id)
1243{
1244 xennet_tx_interrupt(irq, dev_id);
1245 xennet_rx_interrupt(irq, dev_id);
1246 return IRQ_HANDLED;
1247}
1248
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001249#ifdef CONFIG_NET_POLL_CONTROLLER
1250static void xennet_poll_controller(struct net_device *dev)
1251{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001252 /* Poll each queue */
1253 struct netfront_info *info = netdev_priv(dev);
1254 unsigned int num_queues = dev->real_num_tx_queues;
1255 unsigned int i;
1256 for (i = 0; i < num_queues; ++i)
1257 xennet_interrupt(0, &info->queues[i]);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001258}
1259#endif
1260
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001261static const struct net_device_ops xennet_netdev_ops = {
1262 .ndo_open = xennet_open,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001263 .ndo_stop = xennet_close,
1264 .ndo_start_xmit = xennet_start_xmit,
1265 .ndo_change_mtu = xennet_change_mtu,
stephen hemmingere00f85b2011-06-21 05:35:31 +00001266 .ndo_get_stats64 = xennet_get_stats64,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001267 .ndo_set_mac_address = eth_mac_addr,
1268 .ndo_validate_addr = eth_validate_addr,
Michał Mirosławfb507932011-03-31 01:01:35 +00001269 .ndo_fix_features = xennet_fix_features,
1270 .ndo_set_features = xennet_set_features,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001271 .ndo_select_queue = xennet_select_queue,
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001272#ifdef CONFIG_NET_POLL_CONTROLLER
1273 .ndo_poll_controller = xennet_poll_controller,
1274#endif
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001275};
1276
David Vrabel900e1832015-01-13 16:42:42 +00001277static void xennet_free_netdev(struct net_device *netdev)
1278{
1279 struct netfront_info *np = netdev_priv(netdev);
1280
1281 free_percpu(np->rx_stats);
1282 free_percpu(np->tx_stats);
1283 free_netdev(netdev);
1284}
1285
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001286static struct net_device *xennet_create_dev(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001287{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001288 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001289 struct net_device *netdev;
1290 struct netfront_info *np;
1291
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001292 netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues);
Joe Perches41de8d42012-01-29 13:47:52 +00001293 if (!netdev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001294 return ERR_PTR(-ENOMEM);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001295
1296 np = netdev_priv(netdev);
1297 np->xbdev = dev;
1298
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001299 np->queues = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001300
stephen hemmingere00f85b2011-06-21 05:35:31 +00001301 err = -ENOMEM;
David Vrabel900e1832015-01-13 16:42:42 +00001302 np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
1303 if (np->rx_stats == NULL)
1304 goto exit;
1305 np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
1306 if (np->tx_stats == NULL)
stephen hemmingere00f85b2011-06-21 05:35:31 +00001307 goto exit;
1308
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001309 netdev->netdev_ops = &xennet_netdev_ops;
1310
Michał Mirosławfb507932011-03-31 01:01:35 +00001311 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1312 NETIF_F_GSO_ROBUST;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001313 netdev->hw_features = NETIF_F_SG |
1314 NETIF_F_IPV6_CSUM |
1315 NETIF_F_TSO | NETIF_F_TSO6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001316
Ian Campbellfc3e5942011-04-04 11:07:57 -07001317 /*
1318 * Assume that all hw features are available for now. This set
1319 * will be adjusted by the call to netdev_update_features() in
1320 * xennet_connect() which is the earliest point where we can
1321 * negotiate with the backend regarding supported features.
1322 */
1323 netdev->features |= netdev->hw_features;
1324
Wilfried Klaebe7ad24ea2014-05-11 00:12:32 +00001325 netdev->ethtool_ops = &xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001326 SET_NETDEV_DEV(netdev, &dev->dev);
1327
1328 np->netdev = netdev;
1329
1330 netif_carrier_off(netdev);
1331
1332 return netdev;
1333
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001334 exit:
David Vrabel900e1832015-01-13 16:42:42 +00001335 xennet_free_netdev(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001336 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);
Takashi Iwai27b917e2015-02-04 14:38:55 +01001360#ifdef CONFIG_SYSFS
1361 info->netdev->sysfs_groups[0] = &xennet_dev_group;
1362#endif
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001363 err = register_netdev(info->netdev);
1364 if (err) {
Joe Perches383eda32013-06-27 21:57:49 -07001365 pr_warn("%s: register_netdev err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001366 goto fail;
1367 }
1368
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001369 return 0;
1370
1371 fail:
David Vrabel900e1832015-01-13 16:42:42 +00001372 xennet_free_netdev(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001373 dev_set_drvdata(&dev->dev, NULL);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001374 return err;
1375}
1376
1377static void xennet_end_access(int ref, void *page)
1378{
1379 /* This frees the page as a side-effect */
1380 if (ref != GRANT_INVALID_REF)
1381 gnttab_end_foreign_access(ref, 0, (unsigned long)page);
1382}
1383
1384static void xennet_disconnect_backend(struct netfront_info *info)
1385{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001386 unsigned int i = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001387 unsigned int num_queues = info->netdev->real_num_tx_queues;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001388
David Vrabelf9feb1e2014-07-02 16:09:15 +01001389 netif_carrier_off(info->netdev);
1390
Chas Williams9a873c72015-08-19 19:14:20 -04001391 for (i = 0; i < num_queues && info->queues; ++i) {
David Vrabel76541862014-06-18 10:47:27 +01001392 struct netfront_queue *queue = &info->queues[i];
1393
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001394 if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
1395 unbind_from_irqhandler(queue->tx_irq, queue);
1396 if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
1397 unbind_from_irqhandler(queue->tx_irq, queue);
1398 unbind_from_irqhandler(queue->rx_irq, queue);
1399 }
1400 queue->tx_evtchn = queue->rx_evtchn = 0;
1401 queue->tx_irq = queue->rx_irq = 0;
1402
Chas Williams274b0452015-08-27 12:28:46 -04001403 if (netif_running(info->netdev))
1404 napi_synchronize(&queue->napi);
David Vrabelf9feb1e2014-07-02 16:09:15 +01001405
David Vrabela5b5dc32014-07-31 17:38:23 +01001406 xennet_release_tx_bufs(queue);
1407 xennet_release_rx_bufs(queue);
1408 gnttab_free_grant_references(queue->gref_tx_head);
1409 gnttab_free_grant_references(queue->gref_rx_head);
1410
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001411 /* End access and free the pages */
1412 xennet_end_access(queue->tx_ring_ref, queue->tx.sring);
1413 xennet_end_access(queue->rx_ring_ref, queue->rx.sring);
1414
1415 queue->tx_ring_ref = GRANT_INVALID_REF;
1416 queue->rx_ring_ref = GRANT_INVALID_REF;
1417 queue->tx.sring = NULL;
1418 queue->rx.sring = NULL;
Wei Liud634bf22013-05-22 06:34:46 +00001419 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001420}
1421
1422/**
1423 * We are reconnecting to the backend, due to a suspend/resume, or a backend
1424 * driver restart. We tear down our netif structure and recreate it, but
1425 * leave the device-layer structures intact so that this is transparent to the
1426 * rest of the kernel.
1427 */
1428static int netfront_resume(struct xenbus_device *dev)
1429{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001430 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001431
1432 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1433
1434 xennet_disconnect_backend(info);
1435 return 0;
1436}
1437
1438static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
1439{
1440 char *s, *e, *macstr;
1441 int i;
1442
1443 macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
1444 if (IS_ERR(macstr))
1445 return PTR_ERR(macstr);
1446
1447 for (i = 0; i < ETH_ALEN; i++) {
1448 mac[i] = simple_strtoul(s, &e, 16);
1449 if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
1450 kfree(macstr);
1451 return -ENOENT;
1452 }
1453 s = e+1;
1454 }
1455
1456 kfree(macstr);
1457 return 0;
1458}
1459
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001460static int setup_netfront_single(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001461{
1462 int err;
1463
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001464 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001465 if (err < 0)
1466 goto fail;
1467
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001468 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001469 xennet_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001470 0, queue->info->netdev->name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001471 if (err < 0)
1472 goto bind_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001473 queue->rx_evtchn = queue->tx_evtchn;
1474 queue->rx_irq = queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001475
1476 return 0;
1477
1478bind_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001479 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1480 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001481fail:
1482 return err;
1483}
1484
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001485static int setup_netfront_split(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001486{
1487 int err;
1488
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001489 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001490 if (err < 0)
1491 goto fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001492 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001493 if (err < 0)
1494 goto alloc_rx_evtchn_fail;
1495
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001496 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
1497 "%s-tx", queue->name);
1498 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001499 xennet_tx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001500 0, queue->tx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001501 if (err < 0)
1502 goto bind_tx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001503 queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001504
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001505 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
1506 "%s-rx", queue->name);
1507 err = bind_evtchn_to_irqhandler(queue->rx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001508 xennet_rx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001509 0, queue->rx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001510 if (err < 0)
1511 goto bind_rx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001512 queue->rx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001513
1514 return 0;
1515
1516bind_rx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001517 unbind_from_irqhandler(queue->tx_irq, queue);
1518 queue->tx_irq = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001519bind_tx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001520 xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
1521 queue->rx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001522alloc_rx_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001523 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1524 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001525fail:
1526 return err;
1527}
1528
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001529static int setup_netfront(struct xenbus_device *dev,
1530 struct netfront_queue *queue, unsigned int feature_split_evtchn)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001531{
1532 struct xen_netif_tx_sring *txs;
1533 struct xen_netif_rx_sring *rxs;
Wei Liuccc9d902015-04-03 14:44:59 +08001534 grant_ref_t gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001535 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001536
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001537 queue->tx_ring_ref = GRANT_INVALID_REF;
1538 queue->rx_ring_ref = GRANT_INVALID_REF;
1539 queue->rx.sring = NULL;
1540 queue->tx.sring = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001541
Ian Campbella144ff02008-06-17 10:47:08 +02001542 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001543 if (!txs) {
1544 err = -ENOMEM;
1545 xenbus_dev_fatal(dev, err, "allocating tx ring page");
1546 goto fail;
1547 }
1548 SHARED_RING_INIT(txs);
Julien Grall30c5d7f2015-04-10 14:42:21 +01001549 FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001550
Wei Liuccc9d902015-04-03 14:44:59 +08001551 err = xenbus_grant_ring(dev, txs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001552 if (err < 0)
1553 goto grant_tx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001554 queue->tx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001555
Ian Campbella144ff02008-06-17 10:47:08 +02001556 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001557 if (!rxs) {
1558 err = -ENOMEM;
1559 xenbus_dev_fatal(dev, err, "allocating rx ring page");
Wei Liu1ca29832013-05-20 01:05:12 +00001560 goto alloc_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001561 }
1562 SHARED_RING_INIT(rxs);
Julien Grall30c5d7f2015-04-10 14:42:21 +01001563 FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001564
Wei Liuccc9d902015-04-03 14:44:59 +08001565 err = xenbus_grant_ring(dev, rxs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001566 if (err < 0)
1567 goto grant_rx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001568 queue->rx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001569
Wei Liud634bf22013-05-22 06:34:46 +00001570 if (feature_split_evtchn)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001571 err = setup_netfront_split(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001572 /* setup single event channel if
1573 * a) feature-split-event-channels == 0
1574 * b) feature-split-event-channels == 1 but failed to setup
1575 */
1576 if (!feature_split_evtchn || (feature_split_evtchn && err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001577 err = setup_netfront_single(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001578
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001579 if (err)
Wei Liu1ca29832013-05-20 01:05:12 +00001580 goto alloc_evtchn_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001581
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001582 return 0;
1583
Wei Liu1ca29832013-05-20 01:05:12 +00001584 /* If we fail to setup netfront, it is safe to just revoke access to
1585 * granted pages because backend is not accessing it at this point.
1586 */
Wei Liu1ca29832013-05-20 01:05:12 +00001587alloc_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001588 gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001589grant_rx_ring_fail:
1590 free_page((unsigned long)rxs);
1591alloc_rx_ring_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001592 gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001593grant_tx_ring_fail:
1594 free_page((unsigned long)txs);
1595fail:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001596 return err;
1597}
1598
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001599/* Queue-specific initialisation
1600 * This used to be done in xennet_create_dev() but must now
1601 * be run per-queue.
1602 */
1603static int xennet_init_queue(struct netfront_queue *queue)
1604{
1605 unsigned short i;
1606 int err = 0;
1607
1608 spin_lock_init(&queue->tx_lock);
1609 spin_lock_init(&queue->rx_lock);
1610
Vaishali Thakkar493be552015-06-01 10:28:37 +05301611 setup_timer(&queue->rx_refill_timer, rx_refill_timeout,
1612 (unsigned long)queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001613
Wei Liu8b715012014-06-04 10:30:47 +01001614 snprintf(queue->name, sizeof(queue->name), "%s-q%u",
1615 queue->info->netdev->name, queue->id);
1616
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001617 /* Initialise tx_skbs as a free chain containing every entry. */
1618 queue->tx_skb_freelist = 0;
1619 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1620 skb_entry_set_link(&queue->tx_skbs[i], i+1);
1621 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1622 queue->grant_tx_page[i] = NULL;
1623 }
1624
1625 /* Clear out rx_skbs */
1626 for (i = 0; i < NET_RX_RING_SIZE; i++) {
1627 queue->rx_skbs[i] = NULL;
1628 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
1629 }
1630
1631 /* A grant for every tx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001632 if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001633 &queue->gref_tx_head) < 0) {
1634 pr_alert("can't alloc tx grant refs\n");
1635 err = -ENOMEM;
1636 goto exit;
1637 }
1638
1639 /* A grant for every rx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001640 if (gnttab_alloc_grant_references(NET_RX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001641 &queue->gref_rx_head) < 0) {
1642 pr_alert("can't alloc rx grant refs\n");
1643 err = -ENOMEM;
1644 goto exit_free_tx;
1645 }
1646
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001647 return 0;
1648
1649 exit_free_tx:
1650 gnttab_free_grant_references(queue->gref_tx_head);
1651 exit:
1652 return err;
1653}
1654
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001655static int write_queue_xenstore_keys(struct netfront_queue *queue,
1656 struct xenbus_transaction *xbt, int write_hierarchical)
1657{
1658 /* Write the queue-specific keys into XenStore in the traditional
1659 * way for a single queue, or in a queue subkeys for multiple
1660 * queues.
1661 */
1662 struct xenbus_device *dev = queue->info->xbdev;
1663 int err;
1664 const char *message;
1665 char *path;
1666 size_t pathsize;
1667
1668 /* Choose the correct place to write the keys */
1669 if (write_hierarchical) {
1670 pathsize = strlen(dev->nodename) + 10;
1671 path = kzalloc(pathsize, GFP_KERNEL);
1672 if (!path) {
1673 err = -ENOMEM;
1674 message = "out of memory while writing ring references";
1675 goto error;
1676 }
1677 snprintf(path, pathsize, "%s/queue-%u",
1678 dev->nodename, queue->id);
1679 } else {
1680 path = (char *)dev->nodename;
1681 }
1682
1683 /* Write ring references */
1684 err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u",
1685 queue->tx_ring_ref);
1686 if (err) {
1687 message = "writing tx-ring-ref";
1688 goto error;
1689 }
1690
1691 err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u",
1692 queue->rx_ring_ref);
1693 if (err) {
1694 message = "writing rx-ring-ref";
1695 goto error;
1696 }
1697
1698 /* Write event channels; taking into account both shared
1699 * and split event channel scenarios.
1700 */
1701 if (queue->tx_evtchn == queue->rx_evtchn) {
1702 /* Shared event channel */
1703 err = xenbus_printf(*xbt, path,
1704 "event-channel", "%u", queue->tx_evtchn);
1705 if (err) {
1706 message = "writing event-channel";
1707 goto error;
1708 }
1709 } else {
1710 /* Split event channels */
1711 err = xenbus_printf(*xbt, path,
1712 "event-channel-tx", "%u", queue->tx_evtchn);
1713 if (err) {
1714 message = "writing event-channel-tx";
1715 goto error;
1716 }
1717
1718 err = xenbus_printf(*xbt, path,
1719 "event-channel-rx", "%u", queue->rx_evtchn);
1720 if (err) {
1721 message = "writing event-channel-rx";
1722 goto error;
1723 }
1724 }
1725
1726 if (write_hierarchical)
1727 kfree(path);
1728 return 0;
1729
1730error:
1731 if (write_hierarchical)
1732 kfree(path);
1733 xenbus_dev_fatal(dev, err, "%s", message);
1734 return err;
1735}
1736
David Vrabelce587252014-06-18 10:47:28 +01001737static void xennet_destroy_queues(struct netfront_info *info)
1738{
1739 unsigned int i;
1740
1741 rtnl_lock();
1742
1743 for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
1744 struct netfront_queue *queue = &info->queues[i];
1745
1746 if (netif_running(info->netdev))
1747 napi_disable(&queue->napi);
David Vrabelad068112015-05-27 15:46:10 +01001748 del_timer_sync(&queue->rx_refill_timer);
David Vrabelce587252014-06-18 10:47:28 +01001749 netif_napi_del(&queue->napi);
1750 }
1751
1752 rtnl_unlock();
1753
1754 kfree(info->queues);
1755 info->queues = NULL;
1756}
1757
1758static int xennet_create_queues(struct netfront_info *info,
Joe Jinca88ea12015-10-19 13:37:17 +08001759 unsigned int *num_queues)
David Vrabelce587252014-06-18 10:47:28 +01001760{
1761 unsigned int i;
1762 int ret;
1763
Joe Jinca88ea12015-10-19 13:37:17 +08001764 info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue),
David Vrabelce587252014-06-18 10:47:28 +01001765 GFP_KERNEL);
1766 if (!info->queues)
1767 return -ENOMEM;
1768
1769 rtnl_lock();
1770
Joe Jinca88ea12015-10-19 13:37:17 +08001771 for (i = 0; i < *num_queues; i++) {
David Vrabelce587252014-06-18 10:47:28 +01001772 struct netfront_queue *queue = &info->queues[i];
1773
1774 queue->id = i;
1775 queue->info = info;
1776
1777 ret = xennet_init_queue(queue);
1778 if (ret < 0) {
David Vrabel69cb8522014-07-31 17:38:24 +01001779 dev_warn(&info->netdev->dev,
1780 "only created %d queues\n", i);
Joe Jinca88ea12015-10-19 13:37:17 +08001781 *num_queues = i;
David Vrabelce587252014-06-18 10:47:28 +01001782 break;
1783 }
1784
1785 netif_napi_add(queue->info->netdev, &queue->napi,
1786 xennet_poll, 64);
1787 if (netif_running(info->netdev))
1788 napi_enable(&queue->napi);
1789 }
1790
Joe Jinca88ea12015-10-19 13:37:17 +08001791 netif_set_real_num_tx_queues(info->netdev, *num_queues);
David Vrabelce587252014-06-18 10:47:28 +01001792
1793 rtnl_unlock();
1794
Joe Jinca88ea12015-10-19 13:37:17 +08001795 if (*num_queues == 0) {
David Vrabelce587252014-06-18 10:47:28 +01001796 dev_err(&info->netdev->dev, "no queues\n");
1797 return -EINVAL;
1798 }
1799 return 0;
1800}
1801
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001802/* Common code used when first setting up, and when resuming. */
Ian Campbellf502bf22010-08-18 23:27:49 +00001803static int talk_to_netback(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001804 struct netfront_info *info)
1805{
1806 const char *message;
1807 struct xenbus_transaction xbt;
1808 int err;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001809 unsigned int feature_split_evtchn;
1810 unsigned int i = 0;
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001811 unsigned int max_queues = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001812 struct netfront_queue *queue = NULL;
1813 unsigned int num_queues = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001814
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001815 info->netdev->irq = 0;
1816
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001817 /* Check if backend supports multiple queues */
1818 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1819 "multi-queue-max-queues", "%u", &max_queues);
1820 if (err < 0)
1821 max_queues = 1;
1822 num_queues = min(max_queues, xennet_max_queues);
1823
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001824 /* Check feature-split-event-channels */
1825 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1826 "feature-split-event-channels", "%u",
1827 &feature_split_evtchn);
1828 if (err < 0)
1829 feature_split_evtchn = 0;
1830
1831 /* Read mac addr. */
1832 err = xen_net_read_mac(dev, info->netdev->dev_addr);
1833 if (err) {
1834 xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001835 goto out;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001836 }
1837
David Vrabelce587252014-06-18 10:47:28 +01001838 if (info->queues)
1839 xennet_destroy_queues(info);
1840
Joe Jinca88ea12015-10-19 13:37:17 +08001841 err = xennet_create_queues(info, &num_queues);
David Vrabelce587252014-06-18 10:47:28 +01001842 if (err < 0)
1843 goto destroy_ring;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001844
1845 /* Create shared ring, alloc event channel -- for each queue */
1846 for (i = 0; i < num_queues; ++i) {
1847 queue = &info->queues[i];
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001848 err = setup_netfront(dev, queue, feature_split_evtchn);
1849 if (err) {
David Vrabelce587252014-06-18 10:47:28 +01001850 /* setup_netfront() will tidy up the current
1851 * queue on error, but we need to clean up
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001852 * those already allocated.
1853 */
1854 if (i > 0) {
1855 rtnl_lock();
1856 netif_set_real_num_tx_queues(info->netdev, i);
1857 rtnl_unlock();
1858 goto destroy_ring;
1859 } else {
1860 goto out;
1861 }
1862 }
1863 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001864
1865again:
1866 err = xenbus_transaction_start(&xbt);
1867 if (err) {
1868 xenbus_dev_fatal(dev, err, "starting transaction");
1869 goto destroy_ring;
1870 }
1871
chas williams812494d2015-09-16 16:28:25 -04001872 if (xenbus_exists(XBT_NIL,
1873 info->xbdev->otherend, "multi-queue-max-queues")) {
1874 /* Write the number of queues */
1875 err = xenbus_printf(xbt, dev->nodename,
1876 "multi-queue-num-queues", "%u", num_queues);
1877 if (err) {
1878 message = "writing multi-queue-num-queues";
1879 goto abort_transaction_no_dev_fatal;
1880 }
1881 }
1882
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001883 if (num_queues == 1) {
1884 err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
1885 if (err)
1886 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001887 } else {
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001888 /* 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;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001954 out:
1955 return err;
1956}
1957
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001958static int xennet_connect(struct net_device *dev)
1959{
1960 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001961 unsigned int num_queues = 0;
David Vrabela5b5dc32014-07-31 17:38:23 +01001962 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001963 unsigned int feature_rx_copy;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001964 unsigned int j = 0;
1965 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001966
1967 err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1968 "feature-rx-copy", "%u", &feature_rx_copy);
1969 if (err != 1)
1970 feature_rx_copy = 0;
1971
1972 if (!feature_rx_copy) {
1973 dev_info(&dev->dev,
Joe Perches898eb712007-10-18 03:06:30 -07001974 "backend does not support copying receive path\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001975 return -ENODEV;
1976 }
1977
Ian Campbellf502bf22010-08-18 23:27:49 +00001978 err = talk_to_netback(np->xbdev, np);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001979 if (err)
1980 return err;
1981
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001982 /* talk_to_netback() sets the correct number of queues */
1983 num_queues = dev->real_num_tx_queues;
1984
Ian Campbell1ba37c52011-05-24 21:56:02 +00001985 rtnl_lock();
Michał Mirosławfb507932011-03-31 01:01:35 +00001986 netdev_update_features(dev);
Ian Campbell1ba37c52011-05-24 21:56:02 +00001987 rtnl_unlock();
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001988
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001989 /*
David Vrabela5b5dc32014-07-31 17:38:23 +01001990 * All public and private state should now be sane. Get
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001991 * ready to start sending and receiving packets and give the driver
1992 * domain a kick because we've probably just requeued some
1993 * packets.
1994 */
1995 netif_carrier_on(np->netdev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001996 for (j = 0; j < num_queues; ++j) {
1997 queue = &np->queues[j];
David Vrabelf50b4072014-07-02 16:09:14 +01001998
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001999 notify_remote_via_irq(queue->tx_irq);
2000 if (queue->tx_irq != queue->rx_irq)
2001 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002002
David Vrabelf50b4072014-07-02 16:09:14 +01002003 spin_lock_irq(&queue->tx_lock);
2004 xennet_tx_buf_gc(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002005 spin_unlock_irq(&queue->tx_lock);
David Vrabelf50b4072014-07-02 16:09:14 +01002006
2007 spin_lock_bh(&queue->rx_lock);
2008 xennet_alloc_rx_buffers(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002009 spin_unlock_bh(&queue->rx_lock);
2010 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002011
2012 return 0;
2013}
2014
2015/**
2016 * Callback received when the backend's state changes.
2017 */
Ian Campbellf502bf22010-08-18 23:27:49 +00002018static void netback_changed(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002019 enum xenbus_state backend_state)
2020{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002021 struct netfront_info *np = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002022 struct net_device *netdev = np->netdev;
2023
2024 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
2025
2026 switch (backend_state) {
2027 case XenbusStateInitialising:
2028 case XenbusStateInitialised:
Noboru Iwamatsub78c9512009-10-13 17:22:29 -04002029 case XenbusStateReconfiguring:
2030 case XenbusStateReconfigured:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002031 case XenbusStateUnknown:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002032 break;
2033
2034 case XenbusStateInitWait:
2035 if (dev->state != XenbusStateInitialising)
2036 break;
2037 if (xennet_connect(netdev) != 0)
2038 break;
2039 xenbus_switch_state(dev, XenbusStateConnected);
Laszlo Ersek08e34eb2011-12-11 01:48:59 +00002040 break;
2041
2042 case XenbusStateConnected:
Amerigo Wangee89bab2012-08-09 22:14:56 +00002043 netdev_notify_peers(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002044 break;
2045
David Vrabelbce3ea82014-02-04 18:50:26 +00002046 case XenbusStateClosed:
2047 if (dev->state == XenbusStateClosed)
2048 break;
2049 /* Missed the backend's CLOSING state -- fallthrough */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002050 case XenbusStateClosing:
2051 xenbus_frontend_closed(dev);
2052 break;
2053 }
2054}
2055
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002056static const struct xennet_stat {
2057 char name[ETH_GSTRING_LEN];
2058 u16 offset;
2059} xennet_stats[] = {
2060 {
2061 "rx_gso_checksum_fixup",
2062 offsetof(struct netfront_info, rx_gso_checksum_fixup)
2063 },
2064};
2065
2066static int xennet_get_sset_count(struct net_device *dev, int string_set)
2067{
2068 switch (string_set) {
2069 case ETH_SS_STATS:
2070 return ARRAY_SIZE(xennet_stats);
2071 default:
2072 return -EINVAL;
2073 }
2074}
2075
2076static void xennet_get_ethtool_stats(struct net_device *dev,
2077 struct ethtool_stats *stats, u64 * data)
2078{
2079 void *np = netdev_priv(dev);
2080 int i;
2081
2082 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002083 data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset));
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002084}
2085
2086static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
2087{
2088 int i;
2089
2090 switch (stringset) {
2091 case ETH_SS_STATS:
2092 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
2093 memcpy(data + i * ETH_GSTRING_LEN,
2094 xennet_stats[i].name, ETH_GSTRING_LEN);
2095 break;
2096 }
2097}
2098
Stephen Hemminger0fc0b732009-09-02 01:03:33 -07002099static const struct ethtool_ops xennet_ethtool_ops =
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002100{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002101 .get_link = ethtool_op_get_link,
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002102
2103 .get_sset_count = xennet_get_sset_count,
2104 .get_ethtool_stats = xennet_get_ethtool_stats,
2105 .get_strings = xennet_get_strings,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002106};
2107
2108#ifdef CONFIG_SYSFS
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002109static ssize_t show_rxbuf(struct device *dev,
2110 struct device_attribute *attr, char *buf)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002111{
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002112 return sprintf(buf, "%lu\n", NET_RX_RING_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002113}
2114
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002115static ssize_t store_rxbuf(struct device *dev,
2116 struct device_attribute *attr,
2117 const char *buf, size_t len)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002118{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002119 char *endp;
2120 unsigned long target;
2121
2122 if (!capable(CAP_NET_ADMIN))
2123 return -EPERM;
2124
2125 target = simple_strtoul(buf, &endp, 0);
2126 if (endp == buf)
2127 return -EBADMSG;
2128
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002129 /* rxbuf_min and rxbuf_max are no longer configurable. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002130
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002131 return len;
2132}
2133
Takashi Iwai27b917e2015-02-04 14:38:55 +01002134static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
2135static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
2136static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL);
2137
2138static struct attribute *xennet_dev_attrs[] = {
2139 &dev_attr_rxbuf_min.attr,
2140 &dev_attr_rxbuf_max.attr,
2141 &dev_attr_rxbuf_cur.attr,
2142 NULL
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002143};
2144
Takashi Iwai27b917e2015-02-04 14:38:55 +01002145static const struct attribute_group xennet_dev_group = {
2146 .attrs = xennet_dev_attrs
2147};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002148#endif /* CONFIG_SYSFS */
2149
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002150static int xennet_remove(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002151{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002152 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002153
2154 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2155
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002156 xennet_disconnect_backend(info);
2157
Ian Campbell6bc96d02012-06-25 22:48:41 +00002158 unregister_netdev(info->netdev);
2159
Chas Williams9a873c72015-08-19 19:14:20 -04002160 if (info->queues)
2161 xennet_destroy_queues(info);
David Vrabel900e1832015-01-13 16:42:42 +00002162 xennet_free_netdev(info->netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002163
2164 return 0;
2165}
2166
David Vrabel95afae42014-09-08 17:30:41 +01002167static const struct xenbus_device_id netfront_ids[] = {
2168 { "vif" },
2169 { "" }
2170};
2171
2172static struct xenbus_driver netfront_driver = {
2173 .ids = netfront_ids,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002174 .probe = netfront_probe,
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002175 .remove = xennet_remove,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002176 .resume = netfront_resume,
Ian Campbellf502bf22010-08-18 23:27:49 +00002177 .otherend_changed = netback_changed,
David Vrabel95afae42014-09-08 17:30:41 +01002178};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002179
2180static int __init netif_init(void)
2181{
Jeremy Fitzhardinge6e833582008-08-19 13:16:17 -07002182 if (!xen_domain())
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002183 return -ENODEV;
2184
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -05002185 if (!xen_has_pv_nic_devices())
Igor Mammedovb9136d22012-03-21 15:08:38 +01002186 return -ENODEV;
2187
Joe Perches383eda32013-06-27 21:57:49 -07002188 pr_info("Initialising Xen virtual ethernet driver\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002189
Wei Liu32a84402015-09-10 11:18:58 +01002190 /* Allow as many queues as there are CPUs if user has not
2191 * specified a value.
2192 */
2193 if (xennet_max_queues == 0)
2194 xennet_max_queues = num_online_cpus();
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01002195
Al Viroffb78a22008-11-22 17:38:14 +00002196 return xenbus_register_frontend(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002197}
2198module_init(netif_init);
2199
2200
2201static void __exit netif_exit(void)
2202{
Al Viroffb78a22008-11-22 17:38:14 +00002203 xenbus_unregister_driver(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002204}
2205module_exit(netif_exit);
2206
2207MODULE_DESCRIPTION("Xen virtual network device frontend");
2208MODULE_LICENSE("GPL");
Mark McLoughlind2f0c522008-04-02 10:54:05 -07002209MODULE_ALIAS("xen:vif");
Mark McLoughlin4f93f09b2008-04-02 10:54:06 -07002210MODULE_ALIAS("xennet");