blob: 96ccd4e943db49908b0821f1d515aef36072db15 [file] [log] [blame]
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001/*
2 * Virtual network driver for conversing with remote driver backends.
3 *
4 * Copyright (c) 2002-2005, K A Fraser
5 * Copyright (c) 2005, XenSource Ltd
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation; or, when distributed
10 * separately from the Linux kernel or incorporated into other
11 * software packages, subject to the following license:
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a copy
14 * of this source file (the "Software"), to deal in the Software without
15 * restriction, including without limitation the rights to use, copy, modify,
16 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
17 * and to permit persons to whom the Software is furnished to do so, subject to
18 * the following conditions:
19 *
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
29 * IN THE SOFTWARE.
30 */
31
Joe Perches383eda32013-06-27 21:57:49 -070032#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070034#include <linux/module.h>
35#include <linux/kernel.h>
36#include <linux/netdevice.h>
37#include <linux/etherdevice.h>
38#include <linux/skbuff.h>
39#include <linux/ethtool.h>
40#include <linux/if_ether.h>
Wei Liu9ecd1a72013-04-22 02:20:41 +000041#include <net/tcp.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070042#include <linux/udp.h>
43#include <linux/moduleparam.h>
44#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090045#include <linux/slab.h>
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -070046#include <net/ip.h>
47
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;
Malcolm Crossley7d0105b2016-01-26 17:12:44 +0000367 bool more_to_do;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700368
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100369 BUG_ON(!netif_carrier_ok(queue->info->netdev));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700370
371 do {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100372 prod = queue->tx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700373 rmb(); /* Ensure we see responses up to 'rp'. */
374
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100375 for (cons = queue->tx.rsp_cons; cons != prod; cons++) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700376 struct xen_netif_tx_response *txrsp;
377
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100378 txrsp = RING_GET_RESPONSE(&queue->tx, cons);
Ian Campbellf942dc22011-03-15 00:06:18 +0000379 if (txrsp->status == XEN_NETIF_RSP_NULL)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700380 continue;
381
382 id = txrsp->id;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100383 skb = queue->tx_skbs[id].skb;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700384 if (unlikely(gnttab_query_foreign_access(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100385 queue->grant_tx_ref[id]) != 0)) {
Joe Perches383eda32013-06-27 21:57:49 -0700386 pr_alert("%s: warning -- grant still in use by backend domain\n",
387 __func__);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700388 BUG();
389 }
390 gnttab_end_foreign_access_ref(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100391 queue->grant_tx_ref[id], GNTMAP_readonly);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700392 gnttab_release_grant_reference(
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100393 &queue->gref_tx_head, queue->grant_tx_ref[id]);
394 queue->grant_tx_ref[id] = GRANT_INVALID_REF;
395 queue->grant_tx_page[id] = NULL;
396 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700397 dev_kfree_skb_irq(skb);
398 }
399
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100400 queue->tx.rsp_cons = prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700401
Malcolm Crossley7d0105b2016-01-26 17:12:44 +0000402 RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do);
403 } while (more_to_do);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700404
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100405 xennet_maybe_wake_tx(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700406}
407
Julien Grall30c5d7f2015-04-10 14:42:21 +0100408struct xennet_gnttab_make_txreq {
409 struct netfront_queue *queue;
410 struct sk_buff *skb;
411 struct page *page;
412 struct xen_netif_tx_request *tx; /* Last request */
413 unsigned int size;
414};
415
416static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset,
417 unsigned int len, void *data)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700418{
Julien Grall30c5d7f2015-04-10 14:42:21 +0100419 struct xennet_gnttab_make_txreq *info = data;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700420 unsigned int id;
David Vrabela55e8bb2015-01-13 17:16:44 +0000421 struct xen_netif_tx_request *tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700422 grant_ref_t ref;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100423 /* convenient aliases */
424 struct page *page = info->page;
425 struct netfront_queue *queue = info->queue;
426 struct sk_buff *skb = info->skb;
David Vrabela55e8bb2015-01-13 17:16:44 +0000427
428 id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs);
429 tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
430 ref = gnttab_claim_grant_reference(&queue->gref_tx_head);
431 BUG_ON((signed short)ref < 0);
432
Julien Grall30c5d7f2015-04-10 14:42:21 +0100433 gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id,
434 gfn, GNTMAP_readonly);
David Vrabela55e8bb2015-01-13 17:16:44 +0000435
436 queue->tx_skbs[id].skb = skb;
437 queue->grant_tx_page[id] = page;
438 queue->grant_tx_ref[id] = ref;
439
440 tx->id = id;
441 tx->gref = ref;
442 tx->offset = offset;
443 tx->size = len;
444 tx->flags = 0;
445
Julien Grall30c5d7f2015-04-10 14:42:21 +0100446 info->tx = tx;
447 info->size += tx->size;
448}
449
450static struct xen_netif_tx_request *xennet_make_first_txreq(
451 struct netfront_queue *queue, struct sk_buff *skb,
452 struct page *page, unsigned int offset, unsigned int len)
453{
454 struct xennet_gnttab_make_txreq info = {
455 .queue = queue,
456 .skb = skb,
457 .page = page,
458 .size = 0,
459 };
460
461 gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info);
462
463 return info.tx;
464}
465
466static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset,
467 unsigned int len, void *data)
468{
469 struct xennet_gnttab_make_txreq *info = data;
470
471 info->tx->flags |= XEN_NETTXF_more_data;
472 skb_get(info->skb);
473 xennet_tx_setup_grant(gfn, offset, len, data);
David Vrabela55e8bb2015-01-13 17:16:44 +0000474}
475
476static struct xen_netif_tx_request *xennet_make_txreqs(
477 struct netfront_queue *queue, struct xen_netif_tx_request *tx,
478 struct sk_buff *skb, struct page *page,
479 unsigned int offset, unsigned int len)
480{
Julien Grall30c5d7f2015-04-10 14:42:21 +0100481 struct xennet_gnttab_make_txreq info = {
482 .queue = queue,
483 .skb = skb,
484 .tx = tx,
485 };
486
David Vrabela55e8bb2015-01-13 17:16:44 +0000487 /* Skip unused frames from start of page */
488 page += offset >> PAGE_SHIFT;
489 offset &= ~PAGE_MASK;
490
491 while (len) {
Julien Grall30c5d7f2015-04-10 14:42:21 +0100492 info.page = page;
493 info.size = 0;
494
495 gnttab_foreach_grant_in_range(page, offset, len,
496 xennet_make_one_txreq,
497 &info);
498
David Vrabela55e8bb2015-01-13 17:16:44 +0000499 page++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700500 offset = 0;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100501 len -= info.size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700502 }
503
Julien Grall30c5d7f2015-04-10 14:42:21 +0100504 return info.tx;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700505}
506
Ian Campbellf36c3742012-11-21 02:02:16 +0000507/*
David Vrabele84448d2015-01-13 17:16:43 +0000508 * Count how many ring slots are required to send this skb. Each frag
509 * might be a compound page.
Ian Campbellf36c3742012-11-21 02:02:16 +0000510 */
David Vrabele84448d2015-01-13 17:16:43 +0000511static int xennet_count_skb_slots(struct sk_buff *skb)
Ian Campbellf36c3742012-11-21 02:02:16 +0000512{
513 int i, frags = skb_shinfo(skb)->nr_frags;
Julien Grall30c5d7f2015-04-10 14:42:21 +0100514 int slots;
David Vrabele84448d2015-01-13 17:16:43 +0000515
Julien Grall30c5d7f2015-04-10 14:42:21 +0100516 slots = gnttab_count_grant(offset_in_page(skb->data),
517 skb_headlen(skb));
Ian Campbellf36c3742012-11-21 02:02:16 +0000518
519 for (i = 0; i < frags; i++) {
520 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
521 unsigned long size = skb_frag_size(frag);
522 unsigned long offset = frag->page_offset;
523
524 /* Skip unused frames from start of page */
525 offset &= ~PAGE_MASK;
526
Julien Grall30c5d7f2015-04-10 14:42:21 +0100527 slots += gnttab_count_grant(offset, size);
Ian Campbellf36c3742012-11-21 02:02:16 +0000528 }
529
Julien Grall30c5d7f2015-04-10 14:42:21 +0100530 return slots;
Ian Campbellf36c3742012-11-21 02:02:16 +0000531}
532
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100533static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb,
534 void *accel_priv, select_queue_fallback_t fallback)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100535{
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +0100536 unsigned int num_queues = dev->real_num_tx_queues;
537 u32 hash;
538 u16 queue_idx;
539
540 /* First, check if there is only one queue */
541 if (num_queues == 1) {
542 queue_idx = 0;
543 } else {
544 hash = skb_get_hash(skb);
545 queue_idx = hash % num_queues;
546 }
547
548 return queue_idx;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100549}
550
Julien Grall30c5d7f2015-04-10 14:42:21 +0100551#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)
552
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700553static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
554{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700555 struct netfront_info *np = netdev_priv(dev);
David Vrabel900e1832015-01-13 16:42:42 +0000556 struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats);
David Vrabela55e8bb2015-01-13 17:16:44 +0000557 struct xen_netif_tx_request *tx, *first_tx;
558 unsigned int i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700559 int notify;
Ian Campbellf36c3742012-11-21 02:02:16 +0000560 int slots;
David Vrabela55e8bb2015-01-13 17:16:44 +0000561 struct page *page;
562 unsigned int offset;
563 unsigned int len;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +0000564 unsigned long flags;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100565 struct netfront_queue *queue = NULL;
566 unsigned int num_queues = dev->real_num_tx_queues;
567 u16 queue_index;
568
569 /* Drop the packet if no queues are set up */
570 if (num_queues < 1)
571 goto drop;
572 /* Determine which queue to transmit this SKB on */
573 queue_index = skb_get_queue_mapping(skb);
574 queue = &np->queues[queue_index];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700575
Wei Liu9ecd1a72013-04-22 02:20:41 +0000576 /* If skb->len is too big for wire format, drop skb and alert
577 * user about misconfiguration.
578 */
579 if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) {
580 net_alert_ratelimited(
581 "xennet: skb->len = %u, too big for wire format\n",
582 skb->len);
583 goto drop;
584 }
585
David Vrabele84448d2015-01-13 17:16:43 +0000586 slots = xennet_count_skb_slots(skb);
Julien Grall30c5d7f2015-04-10 14:42:21 +0100587 if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) {
Zoltan Kiss97a6d1b2014-08-11 18:32:23 +0100588 net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n",
589 slots, skb->len);
590 if (skb_linearize(skb))
591 goto drop;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700592 }
593
David Vrabela55e8bb2015-01-13 17:16:44 +0000594 page = virt_to_page(skb->data);
595 offset = offset_in_page(skb->data);
596 len = skb_headlen(skb);
597
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100598 spin_lock_irqsave(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700599
600 if (unlikely(!netif_carrier_ok(dev) ||
Ian Campbellf36c3742012-11-21 02:02:16 +0000601 (slots > 1 && !xennet_can_sg(dev)) ||
Johannes Berg8b86a612015-04-17 15:45:04 +0200602 netif_needs_gso(skb, netif_skb_features(skb)))) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100603 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700604 goto drop;
605 }
606
David Vrabela55e8bb2015-01-13 17:16:44 +0000607 /* First request for the linear area. */
Julien Grall30c5d7f2015-04-10 14:42:21 +0100608 first_tx = tx = xennet_make_first_txreq(queue, skb,
609 page, offset, len);
610 offset += tx->size;
611 if (offset == PAGE_SIZE) {
612 page++;
613 offset = 0;
614 }
David Vrabela55e8bb2015-01-13 17:16:44 +0000615 len -= tx->size;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700616
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700617 if (skb->ip_summed == CHECKSUM_PARTIAL)
618 /* local packet? */
Ian Campbellf942dc22011-03-15 00:06:18 +0000619 tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700620 else if (skb->ip_summed == CHECKSUM_UNNECESSARY)
621 /* remote but checksummed. */
Ian Campbellf942dc22011-03-15 00:06:18 +0000622 tx->flags |= XEN_NETTXF_data_validated;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700623
David Vrabela55e8bb2015-01-13 17:16:44 +0000624 /* Optional extra info after the first request. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700625 if (skb_shinfo(skb)->gso_size) {
626 struct xen_netif_extra_info *gso;
627
628 gso = (struct xen_netif_extra_info *)
David Vrabela55e8bb2015-01-13 17:16:44 +0000629 RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700630
Wei Liue2d617c2013-03-25 01:08:17 +0000631 tx->flags |= XEN_NETTXF_extra_info;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700632
633 gso->u.gso.size = skb_shinfo(skb)->gso_size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000634 gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ?
635 XEN_NETIF_GSO_TYPE_TCPV6 :
636 XEN_NETIF_GSO_TYPE_TCPV4;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700637 gso->u.gso.pad = 0;
638 gso->u.gso.features = 0;
639
640 gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
641 gso->flags = 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700642 }
643
David Vrabela55e8bb2015-01-13 17:16:44 +0000644 /* Requests for the rest of the linear area. */
645 tx = xennet_make_txreqs(queue, tx, skb, page, offset, len);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700646
David Vrabela55e8bb2015-01-13 17:16:44 +0000647 /* Requests for all the frags. */
648 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
649 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
650 tx = xennet_make_txreqs(queue, tx, skb,
651 skb_frag_page(frag), frag->page_offset,
652 skb_frag_size(frag));
653 }
654
655 /* First request has the packet length. */
656 first_tx->size = skb->len;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700657
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100658 RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700659 if (notify)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100660 notify_remote_via_irq(queue->tx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700661
David Vrabel900e1832015-01-13 16:42:42 +0000662 u64_stats_update_begin(&tx_stats->syncp);
663 tx_stats->bytes += skb->len;
664 tx_stats->packets++;
665 u64_stats_update_end(&tx_stats->syncp);
Jeremy Fitzhardinge10a273a2007-08-13 12:54:37 -0700666
667 /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100668 xennet_tx_buf_gc(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700669
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100670 if (!netfront_tx_slot_available(queue))
671 netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700672
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100673 spin_unlock_irqrestore(&queue->tx_lock, flags);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700674
Patrick McHardy6ed10652009-06-23 06:03:08 +0000675 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700676
677 drop:
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700678 dev->stats.tx_dropped++;
Eric W. Biederman979de8a2014-03-15 18:33:04 -0700679 dev_kfree_skb_any(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000680 return NETDEV_TX_OK;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700681}
682
683static int xennet_close(struct net_device *dev)
684{
685 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100686 unsigned int num_queues = dev->real_num_tx_queues;
687 unsigned int i;
688 struct netfront_queue *queue;
689 netif_tx_stop_all_queues(np->netdev);
690 for (i = 0; i < num_queues; ++i) {
691 queue = &np->queues[i];
692 napi_disable(&queue->napi);
693 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700694 return 0;
695}
696
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100697static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700698 grant_ref_t ref)
699{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100700 int new = xennet_rxidx(queue->rx.req_prod_pvt);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700701
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100702 BUG_ON(queue->rx_skbs[new]);
703 queue->rx_skbs[new] = skb;
704 queue->grant_rx_ref[new] = ref;
705 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new;
706 RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref;
707 queue->rx.req_prod_pvt++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700708}
709
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100710static int xennet_get_extras(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700711 struct xen_netif_extra_info *extras,
712 RING_IDX rp)
713
714{
715 struct xen_netif_extra_info *extra;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100716 struct device *dev = &queue->info->netdev->dev;
717 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700718 int err = 0;
719
720 do {
721 struct sk_buff *skb;
722 grant_ref_t ref;
723
724 if (unlikely(cons + 1 == rp)) {
725 if (net_ratelimit())
726 dev_warn(dev, "Missing extra info\n");
727 err = -EBADR;
728 break;
729 }
730
731 extra = (struct xen_netif_extra_info *)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100732 RING_GET_RESPONSE(&queue->rx, ++cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700733
734 if (unlikely(!extra->type ||
735 extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) {
736 if (net_ratelimit())
737 dev_warn(dev, "Invalid extra type: %d\n",
738 extra->type);
739 err = -EINVAL;
740 } else {
741 memcpy(&extras[extra->type - 1], extra,
742 sizeof(*extra));
743 }
744
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100745 skb = xennet_get_rx_skb(queue, cons);
746 ref = xennet_get_rx_ref(queue, cons);
747 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700748 } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE);
749
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100750 queue->rx.rsp_cons = cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700751 return err;
752}
753
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100754static int xennet_get_responses(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700755 struct netfront_rx_info *rinfo, RING_IDX rp,
756 struct sk_buff_head *list)
757{
758 struct xen_netif_rx_response *rx = &rinfo->rx;
759 struct xen_netif_extra_info *extras = rinfo->extras;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100760 struct device *dev = &queue->info->netdev->dev;
761 RING_IDX cons = queue->rx.rsp_cons;
762 struct sk_buff *skb = xennet_get_rx_skb(queue, cons);
763 grant_ref_t ref = xennet_get_rx_ref(queue, cons);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700764 int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD);
Wei Liu7158ff62013-03-25 01:08:19 +0000765 int slots = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700766 int err = 0;
767 unsigned long ret;
768
Ian Campbellf942dc22011-03-15 00:06:18 +0000769 if (rx->flags & XEN_NETRXF_extra_info) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100770 err = xennet_get_extras(queue, extras, rp);
771 cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700772 }
773
774 for (;;) {
775 if (unlikely(rx->status < 0 ||
Julien Grall30c5d7f2015-04-10 14:42:21 +0100776 rx->offset + rx->status > XEN_PAGE_SIZE)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700777 if (net_ratelimit())
Julien Grall6c101272015-06-16 20:10:46 +0100778 dev_warn(dev, "rx->offset: %u, size: %d\n",
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700779 rx->offset, rx->status);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100780 xennet_move_rx_slot(queue, skb, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700781 err = -EINVAL;
782 goto next;
783 }
784
785 /*
786 * This definitely indicates a bug, either in this driver or in
787 * the backend driver. In future this should flag the bad
Wei Liu697089d2013-04-22 02:20:40 +0000788 * situation to the system controller to reboot the backend.
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700789 */
790 if (ref == GRANT_INVALID_REF) {
791 if (net_ratelimit())
792 dev_warn(dev, "Bad rx response id %d.\n",
793 rx->id);
794 err = -EINVAL;
795 goto next;
796 }
797
798 ret = gnttab_end_foreign_access_ref(ref, 0);
799 BUG_ON(!ret);
800
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100801 gnttab_release_grant_reference(&queue->gref_rx_head, ref);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700802
803 __skb_queue_tail(list, skb);
804
805next:
Ian Campbellf942dc22011-03-15 00:06:18 +0000806 if (!(rx->flags & XEN_NETRXF_more_data))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700807 break;
808
Wei Liu7158ff62013-03-25 01:08:19 +0000809 if (cons + slots == rp) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700810 if (net_ratelimit())
Wei Liu7158ff62013-03-25 01:08:19 +0000811 dev_warn(dev, "Need more slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700812 err = -ENOENT;
813 break;
814 }
815
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100816 rx = RING_GET_RESPONSE(&queue->rx, cons + slots);
817 skb = xennet_get_rx_skb(queue, cons + slots);
818 ref = xennet_get_rx_ref(queue, cons + slots);
Wei Liu7158ff62013-03-25 01:08:19 +0000819 slots++;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700820 }
821
Wei Liu7158ff62013-03-25 01:08:19 +0000822 if (unlikely(slots > max)) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700823 if (net_ratelimit())
Wei Liu697089d2013-04-22 02:20:40 +0000824 dev_warn(dev, "Too many slots\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700825 err = -E2BIG;
826 }
827
828 if (unlikely(err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100829 queue->rx.rsp_cons = cons + slots;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700830
831 return err;
832}
833
834static int xennet_set_skb_gso(struct sk_buff *skb,
835 struct xen_netif_extra_info *gso)
836{
837 if (!gso->u.gso.size) {
838 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700839 pr_warn("GSO size must not be zero\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700840 return -EINVAL;
841 }
842
Paul Durrant2c0057d2014-01-15 17:30:33 +0000843 if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
844 gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700845 if (net_ratelimit())
Joe Perches383eda32013-06-27 21:57:49 -0700846 pr_warn("Bad GSO type %d\n", gso->u.gso.type);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700847 return -EINVAL;
848 }
849
850 skb_shinfo(skb)->gso_size = gso->u.gso.size;
Paul Durrant2c0057d2014-01-15 17:30:33 +0000851 skb_shinfo(skb)->gso_type =
852 (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
853 SKB_GSO_TCPV4 :
854 SKB_GSO_TCPV6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700855
856 /* Header must be checked, and gso_segs computed. */
857 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
858 skb_shinfo(skb)->gso_segs = 0;
859
860 return 0;
861}
862
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100863static RING_IDX xennet_fill_frags(struct netfront_queue *queue,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700864 struct sk_buff *skb,
865 struct sk_buff_head *list)
866{
867 struct skb_shared_info *shinfo = skb_shinfo(skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100868 RING_IDX cons = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700869 struct sk_buff *nskb;
870
871 while ((nskb = __skb_dequeue(list))) {
872 struct xen_netif_rx_response *rx =
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100873 RING_GET_RESPONSE(&queue->rx, ++cons);
Ian Campbell01c68022011-10-05 00:28:47 +0000874 skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700875
Jan Beulich093b9c72013-07-17 08:09:37 +0100876 if (shinfo->nr_frags == MAX_SKB_FRAGS) {
877 unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700878
Jan Beulich093b9c72013-07-17 08:09:37 +0100879 BUG_ON(pull_to <= skb_headlen(skb));
880 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
881 }
882 BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS);
883
884 skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag),
885 rx->offset, rx->status, PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700886
887 skb_shinfo(nskb)->nr_frags = 0;
888 kfree_skb(nskb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700889 }
890
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700891 return cons;
892}
893
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000894static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700895{
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000896 bool recalculate_partial_csum = false;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000897
898 /*
899 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
900 * peers can fail to set NETRXF_csum_blank when sending a GSO
901 * frame. In this case force the SKB to CHECKSUM_PARTIAL and
902 * recalculate the partial checksum.
903 */
904 if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) {
905 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100906 atomic_inc(&np->rx_gso_checksum_fixup);
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000907 skb->ip_summed = CHECKSUM_PARTIAL;
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000908 recalculate_partial_csum = true;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000909 }
910
911 /* A non-CHECKSUM_PARTIAL SKB does not require setup. */
912 if (skb->ip_summed != CHECKSUM_PARTIAL)
913 return 0;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700914
Paul Durrantb5cf66c2014-01-09 10:02:48 +0000915 return skb_checksum_setup(skb, recalculate_partial_csum);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700916}
917
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100918static int handle_incoming_queue(struct netfront_queue *queue,
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700919 struct sk_buff_head *rxq)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700920{
David Vrabel900e1832015-01-13 16:42:42 +0000921 struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700922 int packets_dropped = 0;
923 struct sk_buff *skb;
924
925 while ((skb = __skb_dequeue(rxq)) != NULL) {
Ian Campbell36832432012-08-22 00:26:47 +0000926 int pull_to = NETFRONT_SKB_CB(skb)->pull_to;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700927
Jan Beulich093b9c72013-07-17 08:09:37 +0100928 if (pull_to > skb_headlen(skb))
929 __pskb_pull_tail(skb, pull_to - skb_headlen(skb));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700930
931 /* Ethernet work: Delayed to here as it peeks the header. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100932 skb->protocol = eth_type_trans(skb, queue->info->netdev);
Wei Liud554f732014-02-19 18:48:34 +0000933 skb_reset_network_header(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700934
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100935 if (checksum_setup(queue->info->netdev, skb)) {
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000936 kfree_skb(skb);
937 packets_dropped++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100938 queue->info->netdev->stats.rx_errors++;
Ian Campbelle0ce4af2011-01-27 04:14:03 +0000939 continue;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700940 }
941
David Vrabel900e1832015-01-13 16:42:42 +0000942 u64_stats_update_begin(&rx_stats->syncp);
943 rx_stats->packets++;
944 rx_stats->bytes += skb->len;
945 u64_stats_update_end(&rx_stats->syncp);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700946
947 /* Pass it up. */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100948 napi_gro_receive(&queue->napi, skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700949 }
950
951 return packets_dropped;
952}
953
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700954static int xennet_poll(struct napi_struct *napi, int budget)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700955{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100956 struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi);
957 struct net_device *dev = queue->info->netdev;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700958 struct sk_buff *skb;
959 struct netfront_rx_info rinfo;
960 struct xen_netif_rx_response *rx = &rinfo.rx;
961 struct xen_netif_extra_info *extras = rinfo.extras;
962 RING_IDX i, rp;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700963 int work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700964 struct sk_buff_head rxq;
965 struct sk_buff_head errq;
966 struct sk_buff_head tmpq;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700967 int err;
968
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100969 spin_lock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700970
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700971 skb_queue_head_init(&rxq);
972 skb_queue_head_init(&errq);
973 skb_queue_head_init(&tmpq);
974
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100975 rp = queue->rx.sring->rsp_prod;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700976 rmb(); /* Ensure we see queued responses up to 'rp'. */
977
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100978 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700979 work_done = 0;
980 while ((i != rp) && (work_done < budget)) {
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100981 memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx));
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700982 memset(extras, 0, sizeof(rinfo.extras));
983
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100984 err = xennet_get_responses(queue, &rinfo, rp, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700985
986 if (unlikely(err)) {
987err:
988 while ((skb = __skb_dequeue(&tmpq)))
989 __skb_queue_tail(&errq, skb);
Jeff Garzik09f75cd2007-10-03 17:41:50 -0700990 dev->stats.rx_errors++;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +0100991 i = queue->rx.rsp_cons;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -0700992 continue;
993 }
994
995 skb = __skb_dequeue(&tmpq);
996
997 if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) {
998 struct xen_netif_extra_info *gso;
999 gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1];
1000
1001 if (unlikely(xennet_set_skb_gso(skb, gso))) {
1002 __skb_queue_head(&tmpq, skb);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001003 queue->rx.rsp_cons += skb_queue_len(&tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001004 goto err;
1005 }
1006 }
1007
Ian Campbell36832432012-08-22 00:26:47 +00001008 NETFRONT_SKB_CB(skb)->pull_to = rx->status;
1009 if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD)
1010 NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001011
Ian Campbell36832432012-08-22 00:26:47 +00001012 skb_shinfo(skb)->frags[0].page_offset = rx->offset;
1013 skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status);
1014 skb->data_len = rx->status;
Jan Beulich093b9c72013-07-17 08:09:37 +01001015 skb->len += rx->status;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001016
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001017 i = xennet_fill_frags(queue, skb, &tmpq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001018
Ian Campbellf942dc22011-03-15 00:06:18 +00001019 if (rx->flags & XEN_NETRXF_csum_blank)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001020 skb->ip_summed = CHECKSUM_PARTIAL;
Ian Campbellf942dc22011-03-15 00:06:18 +00001021 else if (rx->flags & XEN_NETRXF_data_validated)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001022 skb->ip_summed = CHECKSUM_UNNECESSARY;
1023
1024 __skb_queue_tail(&rxq, skb);
1025
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001026 queue->rx.rsp_cons = ++i;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001027 work_done++;
1028 }
1029
Wang Chen56cfe5d2008-05-22 18:09:06 +08001030 __skb_queue_purge(&errq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001031
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001032 work_done -= handle_incoming_queue(queue, &rxq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001033
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001034 xennet_alloc_rx_buffers(queue);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001035
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001036 if (work_done < budget) {
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001037 int more_to_do = 0;
1038
David Vrabel6a6dc082014-12-16 18:59:46 +00001039 napi_complete(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001040
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001041 RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do);
David Vrabel6a6dc082014-12-16 18:59:46 +00001042 if (more_to_do)
1043 napi_schedule(napi);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001044 }
1045
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001046 spin_unlock(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001047
Stephen Hemmingerbea33482007-10-03 16:41:36 -07001048 return work_done;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001049}
1050
1051static int xennet_change_mtu(struct net_device *dev, int mtu)
1052{
Jonathan Davies0c368202015-03-31 11:05:15 +01001053 int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001054
1055 if (mtu > max)
1056 return -EINVAL;
1057 dev->mtu = mtu;
1058 return 0;
1059}
1060
stephen hemmingere00f85b2011-06-21 05:35:31 +00001061static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev,
1062 struct rtnl_link_stats64 *tot)
1063{
1064 struct netfront_info *np = netdev_priv(dev);
1065 int cpu;
1066
1067 for_each_possible_cpu(cpu) {
David Vrabel900e1832015-01-13 16:42:42 +00001068 struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu);
1069 struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu);
stephen hemmingere00f85b2011-06-21 05:35:31 +00001070 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1071 unsigned int start;
1072
1073 do {
David Vrabel900e1832015-01-13 16:42:42 +00001074 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
1075 tx_packets = tx_stats->packets;
1076 tx_bytes = tx_stats->bytes;
1077 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
stephen hemmingere00f85b2011-06-21 05:35:31 +00001078
David Vrabel900e1832015-01-13 16:42:42 +00001079 do {
1080 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
1081 rx_packets = rx_stats->packets;
1082 rx_bytes = rx_stats->bytes;
1083 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
stephen hemmingere00f85b2011-06-21 05:35:31 +00001084
1085 tot->rx_packets += rx_packets;
1086 tot->tx_packets += tx_packets;
1087 tot->rx_bytes += rx_bytes;
1088 tot->tx_bytes += tx_bytes;
1089 }
1090
1091 tot->rx_errors = dev->stats.rx_errors;
1092 tot->tx_dropped = dev->stats.tx_dropped;
1093
1094 return tot;
1095}
1096
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001097static void xennet_release_tx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001098{
1099 struct sk_buff *skb;
1100 int i;
1101
1102 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1103 /* Skip over entries which are actually freelist references */
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001104 if (skb_entry_is_link(&queue->tx_skbs[i]))
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001105 continue;
1106
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001107 skb = queue->tx_skbs[i].skb;
1108 get_page(queue->grant_tx_page[i]);
1109 gnttab_end_foreign_access(queue->grant_tx_ref[i],
Annie Licefe0072014-01-28 11:35:42 +08001110 GNTMAP_readonly,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001111 (unsigned long)page_address(queue->grant_tx_page[i]));
1112 queue->grant_tx_page[i] = NULL;
1113 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1114 add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001115 dev_kfree_skb_irq(skb);
1116 }
1117}
1118
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001119static void xennet_release_rx_bufs(struct netfront_queue *queue)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001120{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001121 int id, ref;
1122
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001123 spin_lock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001124
1125 for (id = 0; id < NET_RX_RING_SIZE; id++) {
Annie Licefe0072014-01-28 11:35:42 +08001126 struct sk_buff *skb;
1127 struct page *page;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001128
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001129 skb = queue->rx_skbs[id];
Annie Licefe0072014-01-28 11:35:42 +08001130 if (!skb)
1131 continue;
1132
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001133 ref = queue->grant_rx_ref[id];
Annie Licefe0072014-01-28 11:35:42 +08001134 if (ref == GRANT_INVALID_REF)
1135 continue;
1136
1137 page = skb_frag_page(&skb_shinfo(skb)->frags[0]);
1138
1139 /* gnttab_end_foreign_access() needs a page ref until
1140 * foreign access is ended (which may be deferred).
1141 */
1142 get_page(page);
1143 gnttab_end_foreign_access(ref, 0,
1144 (unsigned long)page_address(page));
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001145 queue->grant_rx_ref[id] = GRANT_INVALID_REF;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001146
Annie Licefe0072014-01-28 11:35:42 +08001147 kfree_skb(skb);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001148 }
1149
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001150 spin_unlock_bh(&queue->rx_lock);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001151}
1152
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001153static netdev_features_t xennet_fix_features(struct net_device *dev,
1154 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001155{
1156 struct netfront_info *np = netdev_priv(dev);
1157 int val;
1158
1159 if (features & NETIF_F_SG) {
1160 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend, "feature-sg",
1161 "%d", &val) < 0)
1162 val = 0;
1163
1164 if (!val)
1165 features &= ~NETIF_F_SG;
1166 }
1167
Paul Durrant2c0057d2014-01-15 17:30:33 +00001168 if (features & NETIF_F_IPV6_CSUM) {
1169 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1170 "feature-ipv6-csum-offload", "%d", &val) < 0)
1171 val = 0;
1172
1173 if (!val)
1174 features &= ~NETIF_F_IPV6_CSUM;
1175 }
1176
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001177 if (features & NETIF_F_TSO) {
1178 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1179 "feature-gso-tcpv4", "%d", &val) < 0)
1180 val = 0;
1181
1182 if (!val)
1183 features &= ~NETIF_F_TSO;
1184 }
1185
Paul Durrant2c0057d2014-01-15 17:30:33 +00001186 if (features & NETIF_F_TSO6) {
1187 if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1188 "feature-gso-tcpv6", "%d", &val) < 0)
1189 val = 0;
1190
1191 if (!val)
1192 features &= ~NETIF_F_TSO6;
1193 }
1194
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001195 return features;
1196}
1197
Michał Mirosławc8f44af2011-11-15 15:29:55 +00001198static int xennet_set_features(struct net_device *dev,
1199 netdev_features_t features)
Eric Dumazet8f7b01a2011-04-03 17:21:00 -07001200{
1201 if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) {
1202 netdev_info(dev, "Reducing MTU because no SG offload");
1203 dev->mtu = ETH_DATA_LEN;
1204 }
1205
1206 return 0;
1207}
1208
Wei Liud634bf22013-05-22 06:34:46 +00001209static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id)
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001210{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001211 struct netfront_queue *queue = dev_id;
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001212 unsigned long flags;
1213
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001214 spin_lock_irqsave(&queue->tx_lock, flags);
1215 xennet_tx_buf_gc(queue);
1216 spin_unlock_irqrestore(&queue->tx_lock, flags);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001217
1218 return IRQ_HANDLED;
1219}
1220
Wei Liud634bf22013-05-22 06:34:46 +00001221static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id)
1222{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001223 struct netfront_queue *queue = dev_id;
1224 struct net_device *dev = queue->info->netdev;
Wei Liud634bf22013-05-22 06:34:46 +00001225
1226 if (likely(netif_carrier_ok(dev) &&
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001227 RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)))
David Vrabel76541862014-06-18 10:47:27 +01001228 napi_schedule(&queue->napi);
Wei Liud634bf22013-05-22 06:34:46 +00001229
1230 return IRQ_HANDLED;
1231}
1232
1233static irqreturn_t xennet_interrupt(int irq, void *dev_id)
1234{
1235 xennet_tx_interrupt(irq, dev_id);
1236 xennet_rx_interrupt(irq, dev_id);
1237 return IRQ_HANDLED;
1238}
1239
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001240#ifdef CONFIG_NET_POLL_CONTROLLER
1241static void xennet_poll_controller(struct net_device *dev)
1242{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001243 /* Poll each queue */
1244 struct netfront_info *info = netdev_priv(dev);
1245 unsigned int num_queues = dev->real_num_tx_queues;
1246 unsigned int i;
1247 for (i = 0; i < num_queues; ++i)
1248 xennet_interrupt(0, &info->queues[i]);
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001249}
1250#endif
1251
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001252static const struct net_device_ops xennet_netdev_ops = {
1253 .ndo_open = xennet_open,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001254 .ndo_stop = xennet_close,
1255 .ndo_start_xmit = xennet_start_xmit,
1256 .ndo_change_mtu = xennet_change_mtu,
stephen hemmingere00f85b2011-06-21 05:35:31 +00001257 .ndo_get_stats64 = xennet_get_stats64,
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001258 .ndo_set_mac_address = eth_mac_addr,
1259 .ndo_validate_addr = eth_validate_addr,
Michał Mirosławfb507932011-03-31 01:01:35 +00001260 .ndo_fix_features = xennet_fix_features,
1261 .ndo_set_features = xennet_set_features,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001262 .ndo_select_queue = xennet_select_queue,
Konrad Rzeszutek Wilkcf66f9d2012-01-23 08:24:43 +00001263#ifdef CONFIG_NET_POLL_CONTROLLER
1264 .ndo_poll_controller = xennet_poll_controller,
1265#endif
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001266};
1267
David Vrabel900e1832015-01-13 16:42:42 +00001268static void xennet_free_netdev(struct net_device *netdev)
1269{
1270 struct netfront_info *np = netdev_priv(netdev);
1271
1272 free_percpu(np->rx_stats);
1273 free_percpu(np->tx_stats);
1274 free_netdev(netdev);
1275}
1276
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001277static struct net_device *xennet_create_dev(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001278{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001279 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001280 struct net_device *netdev;
1281 struct netfront_info *np;
1282
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001283 netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues);
Joe Perches41de8d42012-01-29 13:47:52 +00001284 if (!netdev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001285 return ERR_PTR(-ENOMEM);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001286
1287 np = netdev_priv(netdev);
1288 np->xbdev = dev;
1289
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001290 np->queues = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001291
stephen hemmingere00f85b2011-06-21 05:35:31 +00001292 err = -ENOMEM;
David Vrabel900e1832015-01-13 16:42:42 +00001293 np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
1294 if (np->rx_stats == NULL)
1295 goto exit;
1296 np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats);
1297 if (np->tx_stats == NULL)
stephen hemmingere00f85b2011-06-21 05:35:31 +00001298 goto exit;
1299
Stephen Hemminger0a0b9d22009-01-06 10:44:55 -08001300 netdev->netdev_ops = &xennet_netdev_ops;
1301
Michał Mirosławfb507932011-03-31 01:01:35 +00001302 netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
1303 NETIF_F_GSO_ROBUST;
Paul Durrant2c0057d2014-01-15 17:30:33 +00001304 netdev->hw_features = NETIF_F_SG |
1305 NETIF_F_IPV6_CSUM |
1306 NETIF_F_TSO | NETIF_F_TSO6;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001307
Ian Campbellfc3e5942011-04-04 11:07:57 -07001308 /*
1309 * Assume that all hw features are available for now. This set
1310 * will be adjusted by the call to netdev_update_features() in
1311 * xennet_connect() which is the earliest point where we can
1312 * negotiate with the backend regarding supported features.
1313 */
1314 netdev->features |= netdev->hw_features;
1315
Wilfried Klaebe7ad24ea2014-05-11 00:12:32 +00001316 netdev->ethtool_ops = &xennet_ethtool_ops;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001317 SET_NETDEV_DEV(netdev, &dev->dev);
1318
1319 np->netdev = netdev;
1320
1321 netif_carrier_off(netdev);
1322
1323 return netdev;
1324
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001325 exit:
David Vrabel900e1832015-01-13 16:42:42 +00001326 xennet_free_netdev(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001327 return ERR_PTR(err);
1328}
1329
1330/**
1331 * Entry point to this code when a new device is created. Allocate the basic
1332 * structures and the ring buffers for communication with the backend, and
1333 * inform the backend of the appropriate details for those.
1334 */
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05001335static int netfront_probe(struct xenbus_device *dev,
Greg Kroah-Hartman1dd06ae2012-12-06 14:30:56 +00001336 const struct xenbus_device_id *id)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001337{
1338 int err;
1339 struct net_device *netdev;
1340 struct netfront_info *info;
1341
1342 netdev = xennet_create_dev(dev);
1343 if (IS_ERR(netdev)) {
1344 err = PTR_ERR(netdev);
1345 xenbus_dev_fatal(dev, err, "creating netdev");
1346 return err;
1347 }
1348
1349 info = netdev_priv(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001350 dev_set_drvdata(&dev->dev, info);
Takashi Iwai27b917e2015-02-04 14:38:55 +01001351#ifdef CONFIG_SYSFS
1352 info->netdev->sysfs_groups[0] = &xennet_dev_group;
1353#endif
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001354 err = register_netdev(info->netdev);
1355 if (err) {
Joe Perches383eda32013-06-27 21:57:49 -07001356 pr_warn("%s: register_netdev err=%d\n", __func__, err);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001357 goto fail;
1358 }
1359
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001360 return 0;
1361
1362 fail:
David Vrabel900e1832015-01-13 16:42:42 +00001363 xennet_free_netdev(netdev);
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001364 dev_set_drvdata(&dev->dev, NULL);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001365 return err;
1366}
1367
1368static void xennet_end_access(int ref, void *page)
1369{
1370 /* This frees the page as a side-effect */
1371 if (ref != GRANT_INVALID_REF)
1372 gnttab_end_foreign_access(ref, 0, (unsigned long)page);
1373}
1374
1375static void xennet_disconnect_backend(struct netfront_info *info)
1376{
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001377 unsigned int i = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001378 unsigned int num_queues = info->netdev->real_num_tx_queues;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001379
David Vrabelf9feb1e2014-07-02 16:09:15 +01001380 netif_carrier_off(info->netdev);
1381
Chas Williams9a873c72015-08-19 19:14:20 -04001382 for (i = 0; i < num_queues && info->queues; ++i) {
David Vrabel76541862014-06-18 10:47:27 +01001383 struct netfront_queue *queue = &info->queues[i];
1384
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001385 if (queue->tx_irq && (queue->tx_irq == queue->rx_irq))
1386 unbind_from_irqhandler(queue->tx_irq, queue);
1387 if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) {
1388 unbind_from_irqhandler(queue->tx_irq, queue);
1389 unbind_from_irqhandler(queue->rx_irq, queue);
1390 }
1391 queue->tx_evtchn = queue->rx_evtchn = 0;
1392 queue->tx_irq = queue->rx_irq = 0;
1393
Chas Williams274b0452015-08-27 12:28:46 -04001394 if (netif_running(info->netdev))
1395 napi_synchronize(&queue->napi);
David Vrabelf9feb1e2014-07-02 16:09:15 +01001396
David Vrabela5b5dc32014-07-31 17:38:23 +01001397 xennet_release_tx_bufs(queue);
1398 xennet_release_rx_bufs(queue);
1399 gnttab_free_grant_references(queue->gref_tx_head);
1400 gnttab_free_grant_references(queue->gref_rx_head);
1401
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001402 /* End access and free the pages */
1403 xennet_end_access(queue->tx_ring_ref, queue->tx.sring);
1404 xennet_end_access(queue->rx_ring_ref, queue->rx.sring);
1405
1406 queue->tx_ring_ref = GRANT_INVALID_REF;
1407 queue->rx_ring_ref = GRANT_INVALID_REF;
1408 queue->tx.sring = NULL;
1409 queue->rx.sring = NULL;
Wei Liud634bf22013-05-22 06:34:46 +00001410 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001411}
1412
1413/**
1414 * We are reconnecting to the backend, due to a suspend/resume, or a backend
1415 * driver restart. We tear down our netif structure and recreate it, but
1416 * leave the device-layer structures intact so that this is transparent to the
1417 * rest of the kernel.
1418 */
1419static int netfront_resume(struct xenbus_device *dev)
1420{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07001421 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001422
1423 dev_dbg(&dev->dev, "%s\n", dev->nodename);
1424
1425 xennet_disconnect_backend(info);
1426 return 0;
1427}
1428
1429static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
1430{
1431 char *s, *e, *macstr;
1432 int i;
1433
1434 macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL);
1435 if (IS_ERR(macstr))
1436 return PTR_ERR(macstr);
1437
1438 for (i = 0; i < ETH_ALEN; i++) {
1439 mac[i] = simple_strtoul(s, &e, 16);
1440 if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) {
1441 kfree(macstr);
1442 return -ENOENT;
1443 }
1444 s = e+1;
1445 }
1446
1447 kfree(macstr);
1448 return 0;
1449}
1450
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001451static int setup_netfront_single(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001452{
1453 int err;
1454
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001455 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001456 if (err < 0)
1457 goto fail;
1458
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001459 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001460 xennet_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001461 0, queue->info->netdev->name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001462 if (err < 0)
1463 goto bind_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001464 queue->rx_evtchn = queue->tx_evtchn;
1465 queue->rx_irq = queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001466
1467 return 0;
1468
1469bind_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001470 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1471 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001472fail:
1473 return err;
1474}
1475
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001476static int setup_netfront_split(struct netfront_queue *queue)
Wei Liud634bf22013-05-22 06:34:46 +00001477{
1478 int err;
1479
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001480 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001481 if (err < 0)
1482 goto fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001483 err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn);
Wei Liud634bf22013-05-22 06:34:46 +00001484 if (err < 0)
1485 goto alloc_rx_evtchn_fail;
1486
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001487 snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name),
1488 "%s-tx", queue->name);
1489 err = bind_evtchn_to_irqhandler(queue->tx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001490 xennet_tx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001491 0, queue->tx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001492 if (err < 0)
1493 goto bind_tx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001494 queue->tx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001495
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001496 snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name),
1497 "%s-rx", queue->name);
1498 err = bind_evtchn_to_irqhandler(queue->rx_evtchn,
Wei Liud634bf22013-05-22 06:34:46 +00001499 xennet_rx_interrupt,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001500 0, queue->rx_irq_name, queue);
Wei Liud634bf22013-05-22 06:34:46 +00001501 if (err < 0)
1502 goto bind_rx_fail;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001503 queue->rx_irq = err;
Wei Liud634bf22013-05-22 06:34:46 +00001504
1505 return 0;
1506
1507bind_rx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001508 unbind_from_irqhandler(queue->tx_irq, queue);
1509 queue->tx_irq = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001510bind_tx_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001511 xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn);
1512 queue->rx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001513alloc_rx_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001514 xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn);
1515 queue->tx_evtchn = 0;
Wei Liud634bf22013-05-22 06:34:46 +00001516fail:
1517 return err;
1518}
1519
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001520static int setup_netfront(struct xenbus_device *dev,
1521 struct netfront_queue *queue, unsigned int feature_split_evtchn)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001522{
1523 struct xen_netif_tx_sring *txs;
1524 struct xen_netif_rx_sring *rxs;
Wei Liuccc9d902015-04-03 14:44:59 +08001525 grant_ref_t gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001526 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001527
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001528 queue->tx_ring_ref = GRANT_INVALID_REF;
1529 queue->rx_ring_ref = GRANT_INVALID_REF;
1530 queue->rx.sring = NULL;
1531 queue->tx.sring = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001532
Ian Campbella144ff02008-06-17 10:47:08 +02001533 txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001534 if (!txs) {
1535 err = -ENOMEM;
1536 xenbus_dev_fatal(dev, err, "allocating tx ring page");
1537 goto fail;
1538 }
1539 SHARED_RING_INIT(txs);
Julien Grall30c5d7f2015-04-10 14:42:21 +01001540 FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001541
Wei Liuccc9d902015-04-03 14:44:59 +08001542 err = xenbus_grant_ring(dev, txs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001543 if (err < 0)
1544 goto grant_tx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001545 queue->tx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001546
Ian Campbella144ff02008-06-17 10:47:08 +02001547 rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001548 if (!rxs) {
1549 err = -ENOMEM;
1550 xenbus_dev_fatal(dev, err, "allocating rx ring page");
Wei Liu1ca29832013-05-20 01:05:12 +00001551 goto alloc_rx_ring_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001552 }
1553 SHARED_RING_INIT(rxs);
Julien Grall30c5d7f2015-04-10 14:42:21 +01001554 FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001555
Wei Liuccc9d902015-04-03 14:44:59 +08001556 err = xenbus_grant_ring(dev, rxs, 1, &gref);
Wei Liu1ca29832013-05-20 01:05:12 +00001557 if (err < 0)
1558 goto grant_rx_ring_fail;
Wei Liuccc9d902015-04-03 14:44:59 +08001559 queue->rx_ring_ref = gref;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001560
Wei Liud634bf22013-05-22 06:34:46 +00001561 if (feature_split_evtchn)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001562 err = setup_netfront_split(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001563 /* setup single event channel if
1564 * a) feature-split-event-channels == 0
1565 * b) feature-split-event-channels == 1 but failed to setup
1566 */
1567 if (!feature_split_evtchn || (feature_split_evtchn && err))
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001568 err = setup_netfront_single(queue);
Wei Liud634bf22013-05-22 06:34:46 +00001569
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001570 if (err)
Wei Liu1ca29832013-05-20 01:05:12 +00001571 goto alloc_evtchn_fail;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001572
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001573 return 0;
1574
Wei Liu1ca29832013-05-20 01:05:12 +00001575 /* If we fail to setup netfront, it is safe to just revoke access to
1576 * granted pages because backend is not accessing it at this point.
1577 */
Wei Liu1ca29832013-05-20 01:05:12 +00001578alloc_evtchn_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001579 gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001580grant_rx_ring_fail:
1581 free_page((unsigned long)rxs);
1582alloc_rx_ring_fail:
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001583 gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0);
Wei Liu1ca29832013-05-20 01:05:12 +00001584grant_tx_ring_fail:
1585 free_page((unsigned long)txs);
1586fail:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001587 return err;
1588}
1589
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001590/* Queue-specific initialisation
1591 * This used to be done in xennet_create_dev() but must now
1592 * be run per-queue.
1593 */
1594static int xennet_init_queue(struct netfront_queue *queue)
1595{
1596 unsigned short i;
1597 int err = 0;
1598
1599 spin_lock_init(&queue->tx_lock);
1600 spin_lock_init(&queue->rx_lock);
1601
Vaishali Thakkar493be552015-06-01 10:28:37 +05301602 setup_timer(&queue->rx_refill_timer, rx_refill_timeout,
1603 (unsigned long)queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001604
Wei Liu8b715012014-06-04 10:30:47 +01001605 snprintf(queue->name, sizeof(queue->name), "%s-q%u",
1606 queue->info->netdev->name, queue->id);
1607
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001608 /* Initialise tx_skbs as a free chain containing every entry. */
1609 queue->tx_skb_freelist = 0;
1610 for (i = 0; i < NET_TX_RING_SIZE; i++) {
1611 skb_entry_set_link(&queue->tx_skbs[i], i+1);
1612 queue->grant_tx_ref[i] = GRANT_INVALID_REF;
1613 queue->grant_tx_page[i] = NULL;
1614 }
1615
1616 /* Clear out rx_skbs */
1617 for (i = 0; i < NET_RX_RING_SIZE; i++) {
1618 queue->rx_skbs[i] = NULL;
1619 queue->grant_rx_ref[i] = GRANT_INVALID_REF;
1620 }
1621
1622 /* A grant for every tx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001623 if (gnttab_alloc_grant_references(NET_TX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001624 &queue->gref_tx_head) < 0) {
1625 pr_alert("can't alloc tx grant refs\n");
1626 err = -ENOMEM;
1627 goto exit;
1628 }
1629
1630 /* A grant for every rx ring slot */
David Vrabel1f3c2eb2014-10-22 11:17:06 +01001631 if (gnttab_alloc_grant_references(NET_RX_RING_SIZE,
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001632 &queue->gref_rx_head) < 0) {
1633 pr_alert("can't alloc rx grant refs\n");
1634 err = -ENOMEM;
1635 goto exit_free_tx;
1636 }
1637
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001638 return 0;
1639
1640 exit_free_tx:
1641 gnttab_free_grant_references(queue->gref_tx_head);
1642 exit:
1643 return err;
1644}
1645
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001646static int write_queue_xenstore_keys(struct netfront_queue *queue,
1647 struct xenbus_transaction *xbt, int write_hierarchical)
1648{
1649 /* Write the queue-specific keys into XenStore in the traditional
1650 * way for a single queue, or in a queue subkeys for multiple
1651 * queues.
1652 */
1653 struct xenbus_device *dev = queue->info->xbdev;
1654 int err;
1655 const char *message;
1656 char *path;
1657 size_t pathsize;
1658
1659 /* Choose the correct place to write the keys */
1660 if (write_hierarchical) {
1661 pathsize = strlen(dev->nodename) + 10;
1662 path = kzalloc(pathsize, GFP_KERNEL);
1663 if (!path) {
1664 err = -ENOMEM;
1665 message = "out of memory while writing ring references";
1666 goto error;
1667 }
1668 snprintf(path, pathsize, "%s/queue-%u",
1669 dev->nodename, queue->id);
1670 } else {
1671 path = (char *)dev->nodename;
1672 }
1673
1674 /* Write ring references */
1675 err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u",
1676 queue->tx_ring_ref);
1677 if (err) {
1678 message = "writing tx-ring-ref";
1679 goto error;
1680 }
1681
1682 err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u",
1683 queue->rx_ring_ref);
1684 if (err) {
1685 message = "writing rx-ring-ref";
1686 goto error;
1687 }
1688
1689 /* Write event channels; taking into account both shared
1690 * and split event channel scenarios.
1691 */
1692 if (queue->tx_evtchn == queue->rx_evtchn) {
1693 /* Shared event channel */
1694 err = xenbus_printf(*xbt, path,
1695 "event-channel", "%u", queue->tx_evtchn);
1696 if (err) {
1697 message = "writing event-channel";
1698 goto error;
1699 }
1700 } else {
1701 /* Split event channels */
1702 err = xenbus_printf(*xbt, path,
1703 "event-channel-tx", "%u", queue->tx_evtchn);
1704 if (err) {
1705 message = "writing event-channel-tx";
1706 goto error;
1707 }
1708
1709 err = xenbus_printf(*xbt, path,
1710 "event-channel-rx", "%u", queue->rx_evtchn);
1711 if (err) {
1712 message = "writing event-channel-rx";
1713 goto error;
1714 }
1715 }
1716
1717 if (write_hierarchical)
1718 kfree(path);
1719 return 0;
1720
1721error:
1722 if (write_hierarchical)
1723 kfree(path);
1724 xenbus_dev_fatal(dev, err, "%s", message);
1725 return err;
1726}
1727
David Vrabelce587252014-06-18 10:47:28 +01001728static void xennet_destroy_queues(struct netfront_info *info)
1729{
1730 unsigned int i;
1731
1732 rtnl_lock();
1733
1734 for (i = 0; i < info->netdev->real_num_tx_queues; i++) {
1735 struct netfront_queue *queue = &info->queues[i];
1736
1737 if (netif_running(info->netdev))
1738 napi_disable(&queue->napi);
David Vrabelad068112015-05-27 15:46:10 +01001739 del_timer_sync(&queue->rx_refill_timer);
David Vrabelce587252014-06-18 10:47:28 +01001740 netif_napi_del(&queue->napi);
1741 }
1742
1743 rtnl_unlock();
1744
1745 kfree(info->queues);
1746 info->queues = NULL;
1747}
1748
1749static int xennet_create_queues(struct netfront_info *info,
Joe Jinca88ea12015-10-19 13:37:17 +08001750 unsigned int *num_queues)
David Vrabelce587252014-06-18 10:47:28 +01001751{
1752 unsigned int i;
1753 int ret;
1754
Joe Jinca88ea12015-10-19 13:37:17 +08001755 info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue),
David Vrabelce587252014-06-18 10:47:28 +01001756 GFP_KERNEL);
1757 if (!info->queues)
1758 return -ENOMEM;
1759
1760 rtnl_lock();
1761
Joe Jinca88ea12015-10-19 13:37:17 +08001762 for (i = 0; i < *num_queues; i++) {
David Vrabelce587252014-06-18 10:47:28 +01001763 struct netfront_queue *queue = &info->queues[i];
1764
1765 queue->id = i;
1766 queue->info = info;
1767
1768 ret = xennet_init_queue(queue);
1769 if (ret < 0) {
David Vrabel69cb8522014-07-31 17:38:24 +01001770 dev_warn(&info->netdev->dev,
1771 "only created %d queues\n", i);
Joe Jinca88ea12015-10-19 13:37:17 +08001772 *num_queues = i;
David Vrabelce587252014-06-18 10:47:28 +01001773 break;
1774 }
1775
1776 netif_napi_add(queue->info->netdev, &queue->napi,
1777 xennet_poll, 64);
1778 if (netif_running(info->netdev))
1779 napi_enable(&queue->napi);
1780 }
1781
Joe Jinca88ea12015-10-19 13:37:17 +08001782 netif_set_real_num_tx_queues(info->netdev, *num_queues);
David Vrabelce587252014-06-18 10:47:28 +01001783
1784 rtnl_unlock();
1785
Joe Jinca88ea12015-10-19 13:37:17 +08001786 if (*num_queues == 0) {
David Vrabelce587252014-06-18 10:47:28 +01001787 dev_err(&info->netdev->dev, "no queues\n");
1788 return -EINVAL;
1789 }
1790 return 0;
1791}
1792
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001793/* Common code used when first setting up, and when resuming. */
Ian Campbellf502bf22010-08-18 23:27:49 +00001794static int talk_to_netback(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001795 struct netfront_info *info)
1796{
1797 const char *message;
1798 struct xenbus_transaction xbt;
1799 int err;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001800 unsigned int feature_split_evtchn;
1801 unsigned int i = 0;
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001802 unsigned int max_queues = 0;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001803 struct netfront_queue *queue = NULL;
1804 unsigned int num_queues = 1;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001805
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001806 info->netdev->irq = 0;
1807
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001808 /* Check if backend supports multiple queues */
1809 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1810 "multi-queue-max-queues", "%u", &max_queues);
1811 if (err < 0)
1812 max_queues = 1;
1813 num_queues = min(max_queues, xennet_max_queues);
1814
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001815 /* Check feature-split-event-channels */
1816 err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
1817 "feature-split-event-channels", "%u",
1818 &feature_split_evtchn);
1819 if (err < 0)
1820 feature_split_evtchn = 0;
1821
1822 /* Read mac addr. */
1823 err = xen_net_read_mac(dev, info->netdev->dev_addr);
1824 if (err) {
1825 xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001826 goto out;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001827 }
1828
David Vrabelce587252014-06-18 10:47:28 +01001829 if (info->queues)
1830 xennet_destroy_queues(info);
1831
Joe Jinca88ea12015-10-19 13:37:17 +08001832 err = xennet_create_queues(info, &num_queues);
David Vrabelce587252014-06-18 10:47:28 +01001833 if (err < 0)
1834 goto destroy_ring;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001835
1836 /* Create shared ring, alloc event channel -- for each queue */
1837 for (i = 0; i < num_queues; ++i) {
1838 queue = &info->queues[i];
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001839 err = setup_netfront(dev, queue, feature_split_evtchn);
1840 if (err) {
David Vrabelce587252014-06-18 10:47:28 +01001841 /* setup_netfront() will tidy up the current
1842 * queue on error, but we need to clean up
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001843 * those already allocated.
1844 */
1845 if (i > 0) {
1846 rtnl_lock();
1847 netif_set_real_num_tx_queues(info->netdev, i);
1848 rtnl_unlock();
1849 goto destroy_ring;
1850 } else {
1851 goto out;
1852 }
1853 }
1854 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001855
1856again:
1857 err = xenbus_transaction_start(&xbt);
1858 if (err) {
1859 xenbus_dev_fatal(dev, err, "starting transaction");
1860 goto destroy_ring;
1861 }
1862
chas williams812494d2015-09-16 16:28:25 -04001863 if (xenbus_exists(XBT_NIL,
1864 info->xbdev->otherend, "multi-queue-max-queues")) {
1865 /* Write the number of queues */
1866 err = xenbus_printf(xbt, dev->nodename,
1867 "multi-queue-num-queues", "%u", num_queues);
1868 if (err) {
1869 message = "writing multi-queue-num-queues";
1870 goto abort_transaction_no_dev_fatal;
1871 }
1872 }
1873
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001874 if (num_queues == 1) {
1875 err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */
1876 if (err)
1877 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001878 } else {
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001879 /* Write the keys for each queue */
1880 for (i = 0; i < num_queues; ++i) {
1881 queue = &info->queues[i];
1882 err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */
1883 if (err)
1884 goto abort_transaction_no_dev_fatal;
Wei Liud634bf22013-05-22 06:34:46 +00001885 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001886 }
1887
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001888 /* The remaining keys are not queue-specific */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001889 err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
1890 1);
1891 if (err) {
1892 message = "writing request-rx-copy";
1893 goto abort_transaction;
1894 }
1895
1896 err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1);
1897 if (err) {
1898 message = "writing feature-rx-notify";
1899 goto abort_transaction;
1900 }
1901
1902 err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1);
1903 if (err) {
1904 message = "writing feature-sg";
1905 goto abort_transaction;
1906 }
1907
1908 err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
1909 if (err) {
1910 message = "writing feature-gso-tcpv4";
1911 goto abort_transaction;
1912 }
1913
Paul Durrant2c0057d2014-01-15 17:30:33 +00001914 err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1");
1915 if (err) {
1916 message = "writing feature-gso-tcpv6";
1917 goto abort_transaction;
1918 }
1919
1920 err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload",
1921 "1");
1922 if (err) {
1923 message = "writing feature-ipv6-csum-offload";
1924 goto abort_transaction;
1925 }
1926
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001927 err = xenbus_transaction_end(xbt, 0);
1928 if (err) {
1929 if (err == -EAGAIN)
1930 goto again;
1931 xenbus_dev_fatal(dev, err, "completing transaction");
1932 goto destroy_ring;
1933 }
1934
1935 return 0;
1936
1937 abort_transaction:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001938 xenbus_dev_fatal(dev, err, "%s", message);
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01001939abort_transaction_no_dev_fatal:
1940 xenbus_transaction_end(xbt, 1);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001941 destroy_ring:
1942 xennet_disconnect_backend(info);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001943 kfree(info->queues);
1944 info->queues = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001945 out:
1946 return err;
1947}
1948
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001949static int xennet_connect(struct net_device *dev)
1950{
1951 struct netfront_info *np = netdev_priv(dev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001952 unsigned int num_queues = 0;
David Vrabela5b5dc32014-07-31 17:38:23 +01001953 int err;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001954 unsigned int feature_rx_copy;
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001955 unsigned int j = 0;
1956 struct netfront_queue *queue = NULL;
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001957
1958 err = xenbus_scanf(XBT_NIL, np->xbdev->otherend,
1959 "feature-rx-copy", "%u", &feature_rx_copy);
1960 if (err != 1)
1961 feature_rx_copy = 0;
1962
1963 if (!feature_rx_copy) {
1964 dev_info(&dev->dev,
Joe Perches898eb712007-10-18 03:06:30 -07001965 "backend does not support copying receive path\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001966 return -ENODEV;
1967 }
1968
Ian Campbellf502bf22010-08-18 23:27:49 +00001969 err = talk_to_netback(np->xbdev, np);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001970 if (err)
1971 return err;
1972
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001973 /* talk_to_netback() sets the correct number of queues */
1974 num_queues = dev->real_num_tx_queues;
1975
Ian Campbell1ba37c52011-05-24 21:56:02 +00001976 rtnl_lock();
Michał Mirosławfb507932011-03-31 01:01:35 +00001977 netdev_update_features(dev);
Ian Campbell1ba37c52011-05-24 21:56:02 +00001978 rtnl_unlock();
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001979
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001980 /*
David Vrabela5b5dc32014-07-31 17:38:23 +01001981 * All public and private state should now be sane. Get
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001982 * ready to start sending and receiving packets and give the driver
1983 * domain a kick because we've probably just requeued some
1984 * packets.
1985 */
1986 netif_carrier_on(np->netdev);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001987 for (j = 0; j < num_queues; ++j) {
1988 queue = &np->queues[j];
David Vrabelf50b4072014-07-02 16:09:14 +01001989
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001990 notify_remote_via_irq(queue->tx_irq);
1991 if (queue->tx_irq != queue->rx_irq)
1992 notify_remote_via_irq(queue->rx_irq);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07001993
David Vrabelf50b4072014-07-02 16:09:14 +01001994 spin_lock_irq(&queue->tx_lock);
1995 xennet_tx_buf_gc(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01001996 spin_unlock_irq(&queue->tx_lock);
David Vrabelf50b4072014-07-02 16:09:14 +01001997
1998 spin_lock_bh(&queue->rx_lock);
1999 xennet_alloc_rx_buffers(queue);
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002000 spin_unlock_bh(&queue->rx_lock);
2001 }
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002002
2003 return 0;
2004}
2005
2006/**
2007 * Callback received when the backend's state changes.
2008 */
Ian Campbellf502bf22010-08-18 23:27:49 +00002009static void netback_changed(struct xenbus_device *dev,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002010 enum xenbus_state backend_state)
2011{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002012 struct netfront_info *np = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002013 struct net_device *netdev = np->netdev;
2014
2015 dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state));
2016
2017 switch (backend_state) {
2018 case XenbusStateInitialising:
2019 case XenbusStateInitialised:
Noboru Iwamatsub78c9512009-10-13 17:22:29 -04002020 case XenbusStateReconfiguring:
2021 case XenbusStateReconfigured:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002022 case XenbusStateUnknown:
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002023 break;
2024
2025 case XenbusStateInitWait:
2026 if (dev->state != XenbusStateInitialising)
2027 break;
2028 if (xennet_connect(netdev) != 0)
2029 break;
2030 xenbus_switch_state(dev, XenbusStateConnected);
Laszlo Ersek08e34eb2011-12-11 01:48:59 +00002031 break;
2032
2033 case XenbusStateConnected:
Amerigo Wangee89bab2012-08-09 22:14:56 +00002034 netdev_notify_peers(netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002035 break;
2036
David Vrabelbce3ea82014-02-04 18:50:26 +00002037 case XenbusStateClosed:
2038 if (dev->state == XenbusStateClosed)
2039 break;
2040 /* Missed the backend's CLOSING state -- fallthrough */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002041 case XenbusStateClosing:
2042 xenbus_frontend_closed(dev);
2043 break;
2044 }
2045}
2046
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002047static const struct xennet_stat {
2048 char name[ETH_GSTRING_LEN];
2049 u16 offset;
2050} xennet_stats[] = {
2051 {
2052 "rx_gso_checksum_fixup",
2053 offsetof(struct netfront_info, rx_gso_checksum_fixup)
2054 },
2055};
2056
2057static int xennet_get_sset_count(struct net_device *dev, int string_set)
2058{
2059 switch (string_set) {
2060 case ETH_SS_STATS:
2061 return ARRAY_SIZE(xennet_stats);
2062 default:
2063 return -EINVAL;
2064 }
2065}
2066
2067static void xennet_get_ethtool_stats(struct net_device *dev,
2068 struct ethtool_stats *stats, u64 * data)
2069{
2070 void *np = netdev_priv(dev);
2071 int i;
2072
2073 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
Andrew J. Bennieston2688fcb2014-06-04 10:30:44 +01002074 data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset));
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002075}
2076
2077static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data)
2078{
2079 int i;
2080
2081 switch (stringset) {
2082 case ETH_SS_STATS:
2083 for (i = 0; i < ARRAY_SIZE(xennet_stats); i++)
2084 memcpy(data + i * ETH_GSTRING_LEN,
2085 xennet_stats[i].name, ETH_GSTRING_LEN);
2086 break;
2087 }
2088}
2089
Stephen Hemminger0fc0b732009-09-02 01:03:33 -07002090static const struct ethtool_ops xennet_ethtool_ops =
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002091{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002092 .get_link = ethtool_op_get_link,
Ian Campbelle0ce4af2011-01-27 04:14:03 +00002093
2094 .get_sset_count = xennet_get_sset_count,
2095 .get_ethtool_stats = xennet_get_ethtool_stats,
2096 .get_strings = xennet_get_strings,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002097};
2098
2099#ifdef CONFIG_SYSFS
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002100static ssize_t show_rxbuf(struct device *dev,
2101 struct device_attribute *attr, char *buf)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002102{
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002103 return sprintf(buf, "%lu\n", NET_RX_RING_SIZE);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002104}
2105
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002106static ssize_t store_rxbuf(struct device *dev,
2107 struct device_attribute *attr,
2108 const char *buf, size_t len)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002109{
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002110 char *endp;
2111 unsigned long target;
2112
2113 if (!capable(CAP_NET_ADMIN))
2114 return -EPERM;
2115
2116 target = simple_strtoul(buf, &endp, 0);
2117 if (endp == buf)
2118 return -EBADMSG;
2119
David Vrabel1f3c2eb2014-10-22 11:17:06 +01002120 /* rxbuf_min and rxbuf_max are no longer configurable. */
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002121
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002122 return len;
2123}
2124
Takashi Iwai27b917e2015-02-04 14:38:55 +01002125static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
2126static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
2127static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL);
2128
2129static struct attribute *xennet_dev_attrs[] = {
2130 &dev_attr_rxbuf_min.attr,
2131 &dev_attr_rxbuf_max.attr,
2132 &dev_attr_rxbuf_cur.attr,
2133 NULL
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002134};
2135
Takashi Iwai27b917e2015-02-04 14:38:55 +01002136static const struct attribute_group xennet_dev_group = {
2137 .attrs = xennet_dev_attrs
2138};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002139#endif /* CONFIG_SYSFS */
2140
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002141static int xennet_remove(struct xenbus_device *dev)
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002142{
Greg Kroah-Hartman1b713e02009-05-04 12:40:54 -07002143 struct netfront_info *info = dev_get_drvdata(&dev->dev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002144
2145 dev_dbg(&dev->dev, "%s\n", dev->nodename);
2146
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002147 xennet_disconnect_backend(info);
2148
Ian Campbell6bc96d02012-06-25 22:48:41 +00002149 unregister_netdev(info->netdev);
2150
Chas Williams9a873c72015-08-19 19:14:20 -04002151 if (info->queues)
2152 xennet_destroy_queues(info);
David Vrabel900e1832015-01-13 16:42:42 +00002153 xennet_free_netdev(info->netdev);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002154
2155 return 0;
2156}
2157
David Vrabel95afae42014-09-08 17:30:41 +01002158static const struct xenbus_device_id netfront_ids[] = {
2159 { "vif" },
2160 { "" }
2161};
2162
2163static struct xenbus_driver netfront_driver = {
2164 .ids = netfront_ids,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002165 .probe = netfront_probe,
Bill Pemberton8e0e46b2012-12-03 09:24:22 -05002166 .remove = xennet_remove,
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002167 .resume = netfront_resume,
Ian Campbellf502bf22010-08-18 23:27:49 +00002168 .otherend_changed = netback_changed,
David Vrabel95afae42014-09-08 17:30:41 +01002169};
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002170
2171static int __init netif_init(void)
2172{
Jeremy Fitzhardinge6e833582008-08-19 13:16:17 -07002173 if (!xen_domain())
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002174 return -ENODEV;
2175
Konrad Rzeszutek Wilk51c71a32013-11-26 15:05:40 -05002176 if (!xen_has_pv_nic_devices())
Igor Mammedovb9136d22012-03-21 15:08:38 +01002177 return -ENODEV;
2178
Joe Perches383eda32013-06-27 21:57:49 -07002179 pr_info("Initialising Xen virtual ethernet driver\n");
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002180
Wei Liu32a84402015-09-10 11:18:58 +01002181 /* Allow as many queues as there are CPUs if user has not
2182 * specified a value.
2183 */
2184 if (xennet_max_queues == 0)
2185 xennet_max_queues = num_online_cpus();
Andrew J. Bennieston50ee6062014-06-04 10:30:45 +01002186
Al Viroffb78a22008-11-22 17:38:14 +00002187 return xenbus_register_frontend(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002188}
2189module_init(netif_init);
2190
2191
2192static void __exit netif_exit(void)
2193{
Al Viroffb78a22008-11-22 17:38:14 +00002194 xenbus_unregister_driver(&netfront_driver);
Jeremy Fitzhardinge0d160212007-07-17 18:37:06 -07002195}
2196module_exit(netif_exit);
2197
2198MODULE_DESCRIPTION("Xen virtual network device frontend");
2199MODULE_LICENSE("GPL");
Mark McLoughlind2f0c522008-04-02 10:54:05 -07002200MODULE_ALIAS("xen:vif");
Mark McLoughlin4f93f09b2008-04-02 10:54:06 -07002201MODULE_ALIAS("xennet");