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0d160211 JF |
1 | /* |
2 | * Virtual network driver for conversing with remote driver backends. | |
3 | * | |
4 | * Copyright (c) 2002-2005, K A Fraser | |
5 | * Copyright (c) 2005, XenSource Ltd | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation; or, when distributed | |
10 | * separately from the Linux kernel or incorporated into other | |
11 | * software packages, subject to the following license: | |
12 | * | |
13 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
14 | * of this source file (the "Software"), to deal in the Software without | |
15 | * restriction, including without limitation the rights to use, copy, modify, | |
16 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
17 | * and to permit persons to whom the Software is furnished to do so, subject to | |
18 | * the following conditions: | |
19 | * | |
20 | * The above copyright notice and this permission notice shall be included in | |
21 | * all copies or substantial portions of the Software. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
24 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
25 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
26 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
27 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
29 | * IN THE SOFTWARE. | |
30 | */ | |
31 | ||
383eda32 JP |
32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
33 | ||
0d160211 JF |
34 | #include <linux/module.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/etherdevice.h> | |
38 | #include <linux/skbuff.h> | |
39 | #include <linux/ethtool.h> | |
40 | #include <linux/if_ether.h> | |
9ecd1a75 | 41 | #include <net/tcp.h> |
0d160211 JF |
42 | #include <linux/udp.h> |
43 | #include <linux/moduleparam.h> | |
44 | #include <linux/mm.h> | |
5a0e3ad6 | 45 | #include <linux/slab.h> |
0d160211 JF |
46 | #include <net/ip.h> |
47 | ||
1ccbf534 | 48 | #include <xen/xen.h> |
0d160211 JF |
49 | #include <xen/xenbus.h> |
50 | #include <xen/events.h> | |
51 | #include <xen/page.h> | |
b9136d20 | 52 | #include <xen/platform_pci.h> |
0d160211 JF |
53 | #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 | ||
50ee6061 AB |
59 | /* Module parameters */ |
60 | static unsigned int xennet_max_queues; | |
61 | module_param_named(max_queues, xennet_max_queues, uint, 0644); | |
62 | MODULE_PARM_DESC(max_queues, | |
63 | "Maximum number of queues per virtual interface"); | |
64 | ||
0fc0b732 | 65 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
66 | |
67 | struct netfront_cb { | |
3683243b | 68 | int pull_to; |
0d160211 JF |
69 | }; |
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 | ||
30c5d7f0 JG |
77 | #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) | |
1f3c2eba DV |
79 | |
80 | /* Minimum number of Rx slots (includes slot for GSO metadata). */ | |
81 | #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) | |
0d160211 | 82 | |
2688fcb7 AB |
83 | /* 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 | ||
e00f85be | 89 | struct netfront_stats { |
900e1833 DV |
90 | u64 packets; |
91 | u64 bytes; | |
e00f85be | 92 | struct u64_stats_sync syncp; |
93 | }; | |
94 | ||
2688fcb7 AB |
95 | struct netfront_info; |
96 | ||
97 | struct netfront_queue { | |
98 | unsigned int id; /* Queue ID, 0-based */ | |
99 | char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ | |
100 | struct netfront_info *info; | |
0d160211 | 101 | |
bea3348e | 102 | struct napi_struct napi; |
0d160211 | 103 | |
d634bf2c WL |
104 | /* 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 */ | |
2688fcb7 AB |
110 | char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ |
111 | char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ | |
0d160211 | 112 | |
84284d3c JF |
113 | spinlock_t tx_lock; |
114 | struct xen_netif_tx_front_ring tx; | |
115 | int tx_ring_ref; | |
0d160211 JF |
116 | |
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; | |
1ffb40b8 | 128 | unsigned long link; |
0d160211 JF |
129 | } tx_skbs[NET_TX_RING_SIZE]; |
130 | grant_ref_t gref_tx_head; | |
131 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
cefe0078 | 132 | struct page *grant_tx_page[NET_TX_RING_SIZE]; |
0d160211 JF |
133 | unsigned tx_skb_freelist; |
134 | ||
84284d3c JF |
135 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
136 | struct xen_netif_rx_front_ring rx; | |
137 | int rx_ring_ref; | |
138 | ||
84284d3c JF |
139 | struct timer_list rx_refill_timer; |
140 | ||
0d160211 JF |
141 | 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]; | |
2688fcb7 AB |
144 | }; |
145 | ||
146 | struct 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; | |
e0ce4af9 IC |
154 | |
155 | /* Statistics */ | |
900e1833 DV |
156 | struct netfront_stats __percpu *rx_stats; |
157 | struct netfront_stats __percpu *tx_stats; | |
e00f85be | 158 | |
2688fcb7 | 159 | atomic_t rx_gso_checksum_fixup; |
0d160211 JF |
160 | }; |
161 | ||
162 | struct 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 | ||
1ffb40b8 IY |
167 | static void skb_entry_set_link(union skb_entry *list, unsigned short id) |
168 | { | |
169 | list->link = id; | |
170 | } | |
171 | ||
172 | static int skb_entry_is_link(const union skb_entry *list) | |
173 | { | |
174 | BUILD_BUG_ON(sizeof(list->skb) != sizeof(list->link)); | |
807540ba | 175 | return (unsigned long)list->skb < PAGE_OFFSET; |
1ffb40b8 IY |
176 | } |
177 | ||
0d160211 JF |
178 | /* |
179 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
180 | */ | |
181 | ||
182 | static void add_id_to_freelist(unsigned *head, union skb_entry *list, | |
183 | unsigned short id) | |
184 | { | |
1ffb40b8 | 185 | skb_entry_set_link(&list[id], *head); |
0d160211 JF |
186 | *head = id; |
187 | } | |
188 | ||
189 | static 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 | ||
197 | static int xennet_rxidx(RING_IDX idx) | |
198 | { | |
199 | return idx & (NET_RX_RING_SIZE - 1); | |
200 | } | |
201 | ||
2688fcb7 | 202 | static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, |
0d160211 JF |
203 | RING_IDX ri) |
204 | { | |
205 | int i = xennet_rxidx(ri); | |
2688fcb7 AB |
206 | struct sk_buff *skb = queue->rx_skbs[i]; |
207 | queue->rx_skbs[i] = NULL; | |
0d160211 JF |
208 | return skb; |
209 | } | |
210 | ||
2688fcb7 | 211 | static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, |
0d160211 JF |
212 | RING_IDX ri) |
213 | { | |
214 | int i = xennet_rxidx(ri); | |
2688fcb7 AB |
215 | grant_ref_t ref = queue->grant_rx_ref[i]; |
216 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; | |
0d160211 JF |
217 | return ref; |
218 | } | |
219 | ||
220 | #ifdef CONFIG_SYSFS | |
27b917e5 | 221 | static const struct attribute_group xennet_dev_group; |
0d160211 JF |
222 | #endif |
223 | ||
3ad9b358 | 224 | static bool xennet_can_sg(struct net_device *dev) |
0d160211 | 225 | { |
3ad9b358 | 226 | return dev->features & NETIF_F_SG; |
0d160211 JF |
227 | } |
228 | ||
229 | ||
230 | static void rx_refill_timeout(unsigned long data) | |
231 | { | |
2688fcb7 AB |
232 | struct netfront_queue *queue = (struct netfront_queue *)data; |
233 | napi_schedule(&queue->napi); | |
0d160211 JF |
234 | } |
235 | ||
2688fcb7 | 236 | static int netfront_tx_slot_available(struct netfront_queue *queue) |
0d160211 | 237 | { |
2688fcb7 | 238 | return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < |
1f3c2eba | 239 | (NET_TX_RING_SIZE - MAX_SKB_FRAGS - 2); |
0d160211 JF |
240 | } |
241 | ||
2688fcb7 | 242 | static void xennet_maybe_wake_tx(struct netfront_queue *queue) |
0d160211 | 243 | { |
2688fcb7 AB |
244 | struct net_device *dev = queue->info->netdev; |
245 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); | |
0d160211 | 246 | |
2688fcb7 AB |
247 | if (unlikely(netif_tx_queue_stopped(dev_queue)) && |
248 | netfront_tx_slot_available(queue) && | |
0d160211 | 249 | likely(netif_running(dev))) |
2688fcb7 | 250 | netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); |
0d160211 JF |
251 | } |
252 | ||
1f3c2eba DV |
253 | |
254 | static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) | |
0d160211 | 255 | { |
0d160211 JF |
256 | struct sk_buff *skb; |
257 | struct page *page; | |
0d160211 | 258 | |
1f3c2eba DV |
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; | |
0d160211 | 264 | |
1f3c2eba DV |
265 | page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); |
266 | if (!page) { | |
267 | kfree_skb(skb); | |
268 | return NULL; | |
0d160211 | 269 | } |
1f3c2eba DV |
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 | } | |
0d160211 | 278 | |
1f3c2eba DV |
279 | |
280 | static void xennet_alloc_rx_buffers(struct netfront_queue *queue) | |
281 | { | |
282 | RING_IDX req_prod = queue->rx.req_prod_pvt; | |
283 | int notify; | |
538d9291 | 284 | int err = 0; |
1f3c2eba DV |
285 | |
286 | if (unlikely(!netif_carrier_ok(queue->info->netdev))) | |
0d160211 | 287 | return; |
0d160211 | 288 | |
1f3c2eba DV |
289 | for (req_prod = queue->rx.req_prod_pvt; |
290 | req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; | |
291 | req_prod++) { | |
292 | struct sk_buff *skb; | |
293 | unsigned short id; | |
294 | grant_ref_t ref; | |
30c5d7f0 | 295 | struct page *page; |
1f3c2eba | 296 | struct xen_netif_rx_request *req; |
0d160211 | 297 | |
1f3c2eba | 298 | skb = xennet_alloc_one_rx_buffer(queue); |
538d9291 VRP |
299 | if (!skb) { |
300 | err = -ENOMEM; | |
0d160211 | 301 | break; |
538d9291 | 302 | } |
0d160211 | 303 | |
1f3c2eba | 304 | id = xennet_rxidx(req_prod); |
0d160211 | 305 | |
2688fcb7 AB |
306 | BUG_ON(queue->rx_skbs[id]); |
307 | queue->rx_skbs[id] = skb; | |
0d160211 | 308 | |
2688fcb7 | 309 | ref = gnttab_claim_grant_reference(&queue->gref_rx_head); |
269ebce4 | 310 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
2688fcb7 | 311 | queue->grant_rx_ref[id] = ref; |
0d160211 | 312 | |
30c5d7f0 | 313 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
0d160211 | 314 | |
1f3c2eba | 315 | req = RING_GET_REQUEST(&queue->rx, req_prod); |
30c5d7f0 JG |
316 | gnttab_page_grant_foreign_access_ref_one(ref, |
317 | queue->info->xbdev->otherend_id, | |
318 | page, | |
319 | 0); | |
0d160211 JF |
320 | req->id = id; |
321 | req->gref = ref; | |
322 | } | |
323 | ||
1f3c2eba DV |
324 | queue->rx.req_prod_pvt = req_prod; |
325 | ||
538d9291 VRP |
326 | /* Try again later if there are not enough requests or skb allocation |
327 | * failed. | |
328 | * Enough requests is quantified as the sum of newly created slots and | |
329 | * the unconsumed slots at the backend. | |
330 | */ | |
331 | if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || | |
332 | unlikely(err)) { | |
1f3c2eba DV |
333 | mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); |
334 | return; | |
335 | } | |
336 | ||
5dcddfae | 337 | wmb(); /* barrier so backend seens requests */ |
0d160211 | 338 | |
2688fcb7 | 339 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); |
0d160211 | 340 | if (notify) |
2688fcb7 | 341 | notify_remote_via_irq(queue->rx_irq); |
0d160211 JF |
342 | } |
343 | ||
344 | static int xennet_open(struct net_device *dev) | |
345 | { | |
346 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 AB |
347 | unsigned int num_queues = dev->real_num_tx_queues; |
348 | unsigned int i = 0; | |
349 | struct netfront_queue *queue = NULL; | |
350 | ||
351 | for (i = 0; i < num_queues; ++i) { | |
352 | queue = &np->queues[i]; | |
353 | napi_enable(&queue->napi); | |
354 | ||
355 | spin_lock_bh(&queue->rx_lock); | |
356 | if (netif_carrier_ok(dev)) { | |
357 | xennet_alloc_rx_buffers(queue); | |
358 | queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; | |
359 | if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) | |
360 | napi_schedule(&queue->napi); | |
361 | } | |
362 | spin_unlock_bh(&queue->rx_lock); | |
0d160211 | 363 | } |
0d160211 | 364 | |
2688fcb7 | 365 | netif_tx_start_all_queues(dev); |
0d160211 JF |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
2688fcb7 | 370 | static void xennet_tx_buf_gc(struct netfront_queue *queue) |
0d160211 JF |
371 | { |
372 | RING_IDX cons, prod; | |
373 | unsigned short id; | |
0d160211 | 374 | struct sk_buff *skb; |
7d0105b5 | 375 | bool more_to_do; |
0d160211 | 376 | |
2688fcb7 | 377 | BUG_ON(!netif_carrier_ok(queue->info->netdev)); |
0d160211 JF |
378 | |
379 | do { | |
2688fcb7 | 380 | prod = queue->tx.sring->rsp_prod; |
0d160211 JF |
381 | rmb(); /* Ensure we see responses up to 'rp'. */ |
382 | ||
2688fcb7 | 383 | for (cons = queue->tx.rsp_cons; cons != prod; cons++) { |
0d160211 JF |
384 | struct xen_netif_tx_response *txrsp; |
385 | ||
2688fcb7 | 386 | txrsp = RING_GET_RESPONSE(&queue->tx, cons); |
f942dc25 | 387 | if (txrsp->status == XEN_NETIF_RSP_NULL) |
0d160211 JF |
388 | continue; |
389 | ||
390 | id = txrsp->id; | |
2688fcb7 | 391 | skb = queue->tx_skbs[id].skb; |
0d160211 | 392 | if (unlikely(gnttab_query_foreign_access( |
2688fcb7 | 393 | queue->grant_tx_ref[id]) != 0)) { |
383eda32 JP |
394 | pr_alert("%s: warning -- grant still in use by backend domain\n", |
395 | __func__); | |
0d160211 JF |
396 | BUG(); |
397 | } | |
398 | gnttab_end_foreign_access_ref( | |
2688fcb7 | 399 | queue->grant_tx_ref[id], GNTMAP_readonly); |
0d160211 | 400 | gnttab_release_grant_reference( |
2688fcb7 AB |
401 | &queue->gref_tx_head, queue->grant_tx_ref[id]); |
402 | queue->grant_tx_ref[id] = GRANT_INVALID_REF; | |
403 | queue->grant_tx_page[id] = NULL; | |
404 | add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, id); | |
0d160211 JF |
405 | dev_kfree_skb_irq(skb); |
406 | } | |
407 | ||
2688fcb7 | 408 | queue->tx.rsp_cons = prod; |
0d160211 | 409 | |
7d0105b5 MC |
410 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); |
411 | } while (more_to_do); | |
0d160211 | 412 | |
2688fcb7 | 413 | xennet_maybe_wake_tx(queue); |
0d160211 JF |
414 | } |
415 | ||
30c5d7f0 JG |
416 | struct xennet_gnttab_make_txreq { |
417 | struct netfront_queue *queue; | |
418 | struct sk_buff *skb; | |
419 | struct page *page; | |
420 | struct xen_netif_tx_request *tx; /* Last request */ | |
421 | unsigned int size; | |
422 | }; | |
423 | ||
424 | static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, | |
425 | unsigned int len, void *data) | |
0d160211 | 426 | { |
30c5d7f0 | 427 | struct xennet_gnttab_make_txreq *info = data; |
0d160211 | 428 | unsigned int id; |
a55e8bb8 | 429 | struct xen_netif_tx_request *tx; |
0d160211 | 430 | grant_ref_t ref; |
30c5d7f0 JG |
431 | /* convenient aliases */ |
432 | struct page *page = info->page; | |
433 | struct netfront_queue *queue = info->queue; | |
434 | struct sk_buff *skb = info->skb; | |
0d160211 | 435 | |
a55e8bb8 DV |
436 | id = get_id_from_freelist(&queue->tx_skb_freelist, queue->tx_skbs); |
437 | tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); | |
438 | ref = gnttab_claim_grant_reference(&queue->gref_tx_head); | |
269ebce4 | 439 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
0d160211 | 440 | |
30c5d7f0 JG |
441 | gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, |
442 | gfn, GNTMAP_readonly); | |
0d160211 | 443 | |
a55e8bb8 DV |
444 | queue->tx_skbs[id].skb = skb; |
445 | queue->grant_tx_page[id] = page; | |
446 | queue->grant_tx_ref[id] = ref; | |
0d160211 | 447 | |
a55e8bb8 DV |
448 | tx->id = id; |
449 | tx->gref = ref; | |
450 | tx->offset = offset; | |
451 | tx->size = len; | |
452 | tx->flags = 0; | |
0d160211 | 453 | |
30c5d7f0 JG |
454 | info->tx = tx; |
455 | info->size += tx->size; | |
456 | } | |
457 | ||
458 | static struct xen_netif_tx_request *xennet_make_first_txreq( | |
459 | struct netfront_queue *queue, struct sk_buff *skb, | |
460 | struct page *page, unsigned int offset, unsigned int len) | |
461 | { | |
462 | struct xennet_gnttab_make_txreq info = { | |
463 | .queue = queue, | |
464 | .skb = skb, | |
465 | .page = page, | |
466 | .size = 0, | |
467 | }; | |
468 | ||
469 | gnttab_for_one_grant(page, offset, len, xennet_tx_setup_grant, &info); | |
470 | ||
471 | return info.tx; | |
472 | } | |
473 | ||
474 | static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, | |
475 | unsigned int len, void *data) | |
476 | { | |
477 | struct xennet_gnttab_make_txreq *info = data; | |
478 | ||
479 | info->tx->flags |= XEN_NETTXF_more_data; | |
480 | skb_get(info->skb); | |
481 | xennet_tx_setup_grant(gfn, offset, len, data); | |
a55e8bb8 | 482 | } |
0d160211 | 483 | |
a55e8bb8 DV |
484 | static struct xen_netif_tx_request *xennet_make_txreqs( |
485 | struct netfront_queue *queue, struct xen_netif_tx_request *tx, | |
486 | struct sk_buff *skb, struct page *page, | |
487 | unsigned int offset, unsigned int len) | |
488 | { | |
30c5d7f0 JG |
489 | struct xennet_gnttab_make_txreq info = { |
490 | .queue = queue, | |
491 | .skb = skb, | |
492 | .tx = tx, | |
493 | }; | |
494 | ||
a55e8bb8 DV |
495 | /* Skip unused frames from start of page */ |
496 | page += offset >> PAGE_SHIFT; | |
497 | offset &= ~PAGE_MASK; | |
0d160211 | 498 | |
a55e8bb8 | 499 | while (len) { |
30c5d7f0 JG |
500 | info.page = page; |
501 | info.size = 0; | |
502 | ||
503 | gnttab_foreach_grant_in_range(page, offset, len, | |
504 | xennet_make_one_txreq, | |
505 | &info); | |
506 | ||
a55e8bb8 DV |
507 | page++; |
508 | offset = 0; | |
30c5d7f0 | 509 | len -= info.size; |
0d160211 JF |
510 | } |
511 | ||
30c5d7f0 | 512 | return info.tx; |
0d160211 JF |
513 | } |
514 | ||
f36c3747 | 515 | /* |
e84448d5 DV |
516 | * Count how many ring slots are required to send this skb. Each frag |
517 | * might be a compound page. | |
f36c3747 | 518 | */ |
e84448d5 | 519 | static int xennet_count_skb_slots(struct sk_buff *skb) |
f36c3747 IC |
520 | { |
521 | int i, frags = skb_shinfo(skb)->nr_frags; | |
30c5d7f0 | 522 | int slots; |
e84448d5 | 523 | |
30c5d7f0 JG |
524 | slots = gnttab_count_grant(offset_in_page(skb->data), |
525 | skb_headlen(skb)); | |
f36c3747 IC |
526 | |
527 | for (i = 0; i < frags; i++) { | |
528 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
529 | unsigned long size = skb_frag_size(frag); | |
530 | unsigned long offset = frag->page_offset; | |
531 | ||
532 | /* Skip unused frames from start of page */ | |
533 | offset &= ~PAGE_MASK; | |
534 | ||
30c5d7f0 | 535 | slots += gnttab_count_grant(offset, size); |
f36c3747 IC |
536 | } |
537 | ||
30c5d7f0 | 538 | return slots; |
f36c3747 IC |
539 | } |
540 | ||
50ee6061 AB |
541 | static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, |
542 | void *accel_priv, select_queue_fallback_t fallback) | |
2688fcb7 | 543 | { |
50ee6061 AB |
544 | unsigned int num_queues = dev->real_num_tx_queues; |
545 | u32 hash; | |
546 | u16 queue_idx; | |
547 | ||
548 | /* First, check if there is only one queue */ | |
549 | if (num_queues == 1) { | |
550 | queue_idx = 0; | |
551 | } else { | |
552 | hash = skb_get_hash(skb); | |
553 | queue_idx = hash % num_queues; | |
554 | } | |
555 | ||
556 | return queue_idx; | |
2688fcb7 AB |
557 | } |
558 | ||
30c5d7f0 JG |
559 | #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
560 | ||
0d160211 JF |
561 | static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
562 | { | |
0d160211 | 563 | struct netfront_info *np = netdev_priv(dev); |
900e1833 | 564 | struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
a55e8bb8 DV |
565 | struct xen_netif_tx_request *tx, *first_tx; |
566 | unsigned int i; | |
0d160211 | 567 | int notify; |
f36c3747 | 568 | int slots; |
a55e8bb8 DV |
569 | struct page *page; |
570 | unsigned int offset; | |
571 | unsigned int len; | |
cf66f9d4 | 572 | unsigned long flags; |
2688fcb7 AB |
573 | struct netfront_queue *queue = NULL; |
574 | unsigned int num_queues = dev->real_num_tx_queues; | |
575 | u16 queue_index; | |
fd07160b | 576 | struct sk_buff *nskb; |
2688fcb7 AB |
577 | |
578 | /* Drop the packet if no queues are set up */ | |
579 | if (num_queues < 1) | |
580 | goto drop; | |
581 | /* Determine which queue to transmit this SKB on */ | |
582 | queue_index = skb_get_queue_mapping(skb); | |
583 | queue = &np->queues[queue_index]; | |
0d160211 | 584 | |
9ecd1a75 WL |
585 | /* If skb->len is too big for wire format, drop skb and alert |
586 | * user about misconfiguration. | |
587 | */ | |
588 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
589 | net_alert_ratelimited( | |
590 | "xennet: skb->len = %u, too big for wire format\n", | |
591 | skb->len); | |
592 | goto drop; | |
593 | } | |
594 | ||
e84448d5 | 595 | slots = xennet_count_skb_slots(skb); |
30c5d7f0 | 596 | if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { |
97a6d1bb ZK |
597 | net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", |
598 | slots, skb->len); | |
599 | if (skb_linearize(skb)) | |
600 | goto drop; | |
0d160211 JF |
601 | } |
602 | ||
a55e8bb8 DV |
603 | page = virt_to_page(skb->data); |
604 | offset = offset_in_page(skb->data); | |
fd07160b VK |
605 | |
606 | /* The first req should be at least ETH_HLEN size or the packet will be | |
607 | * dropped by netback. | |
608 | */ | |
609 | if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { | |
610 | nskb = skb_copy(skb, GFP_ATOMIC); | |
611 | if (!nskb) | |
612 | goto drop; | |
613 | dev_kfree_skb_any(skb); | |
614 | skb = nskb; | |
615 | page = virt_to_page(skb->data); | |
616 | offset = offset_in_page(skb->data); | |
617 | } | |
618 | ||
a55e8bb8 DV |
619 | len = skb_headlen(skb); |
620 | ||
2688fcb7 | 621 | spin_lock_irqsave(&queue->tx_lock, flags); |
0d160211 JF |
622 | |
623 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 624 | (slots > 1 && !xennet_can_sg(dev)) || |
8b86a61d | 625 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
2688fcb7 | 626 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
0d160211 JF |
627 | goto drop; |
628 | } | |
629 | ||
a55e8bb8 | 630 | /* First request for the linear area. */ |
30c5d7f0 JG |
631 | first_tx = tx = xennet_make_first_txreq(queue, skb, |
632 | page, offset, len); | |
633 | offset += tx->size; | |
634 | if (offset == PAGE_SIZE) { | |
635 | page++; | |
636 | offset = 0; | |
637 | } | |
a55e8bb8 | 638 | len -= tx->size; |
0d160211 | 639 | |
0d160211 JF |
640 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
641 | /* local packet? */ | |
f942dc25 | 642 | tx->flags |= XEN_NETTXF_csum_blank | XEN_NETTXF_data_validated; |
0d160211 JF |
643 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
644 | /* remote but checksummed. */ | |
f942dc25 | 645 | tx->flags |= XEN_NETTXF_data_validated; |
0d160211 | 646 | |
a55e8bb8 | 647 | /* Optional extra info after the first request. */ |
0d160211 JF |
648 | if (skb_shinfo(skb)->gso_size) { |
649 | struct xen_netif_extra_info *gso; | |
650 | ||
651 | gso = (struct xen_netif_extra_info *) | |
a55e8bb8 | 652 | RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
0d160211 | 653 | |
e2d617c0 | 654 | tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
655 | |
656 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
2c0057de PD |
657 | gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
658 | XEN_NETIF_GSO_TYPE_TCPV6 : | |
659 | XEN_NETIF_GSO_TYPE_TCPV4; | |
0d160211 JF |
660 | gso->u.gso.pad = 0; |
661 | gso->u.gso.features = 0; | |
662 | ||
663 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
664 | gso->flags = 0; | |
0d160211 JF |
665 | } |
666 | ||
a55e8bb8 DV |
667 | /* Requests for the rest of the linear area. */ |
668 | tx = xennet_make_txreqs(queue, tx, skb, page, offset, len); | |
669 | ||
670 | /* Requests for all the frags. */ | |
671 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
672 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
673 | tx = xennet_make_txreqs(queue, tx, skb, | |
674 | skb_frag_page(frag), frag->page_offset, | |
675 | skb_frag_size(frag)); | |
676 | } | |
0d160211 | 677 | |
a55e8bb8 DV |
678 | /* First request has the packet length. */ |
679 | first_tx->size = skb->len; | |
0d160211 | 680 | |
2688fcb7 | 681 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
0d160211 | 682 | if (notify) |
2688fcb7 | 683 | notify_remote_via_irq(queue->tx_irq); |
0d160211 | 684 | |
900e1833 DV |
685 | u64_stats_update_begin(&tx_stats->syncp); |
686 | tx_stats->bytes += skb->len; | |
687 | tx_stats->packets++; | |
688 | u64_stats_update_end(&tx_stats->syncp); | |
10a273a6 JF |
689 | |
690 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
2688fcb7 | 691 | xennet_tx_buf_gc(queue); |
0d160211 | 692 | |
2688fcb7 AB |
693 | if (!netfront_tx_slot_available(queue)) |
694 | netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); | |
0d160211 | 695 | |
2688fcb7 | 696 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
0d160211 | 697 | |
6ed10654 | 698 | return NETDEV_TX_OK; |
0d160211 JF |
699 | |
700 | drop: | |
09f75cd7 | 701 | dev->stats.tx_dropped++; |
979de8a0 | 702 | dev_kfree_skb_any(skb); |
6ed10654 | 703 | return NETDEV_TX_OK; |
0d160211 JF |
704 | } |
705 | ||
706 | static int xennet_close(struct net_device *dev) | |
707 | { | |
708 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 AB |
709 | unsigned int num_queues = dev->real_num_tx_queues; |
710 | unsigned int i; | |
711 | struct netfront_queue *queue; | |
712 | netif_tx_stop_all_queues(np->netdev); | |
713 | for (i = 0; i < num_queues; ++i) { | |
714 | queue = &np->queues[i]; | |
715 | napi_disable(&queue->napi); | |
716 | } | |
0d160211 JF |
717 | return 0; |
718 | } | |
719 | ||
2688fcb7 | 720 | static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, |
0d160211 JF |
721 | grant_ref_t ref) |
722 | { | |
2688fcb7 AB |
723 | int new = xennet_rxidx(queue->rx.req_prod_pvt); |
724 | ||
725 | BUG_ON(queue->rx_skbs[new]); | |
726 | queue->rx_skbs[new] = skb; | |
727 | queue->grant_rx_ref[new] = ref; | |
728 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; | |
729 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; | |
730 | queue->rx.req_prod_pvt++; | |
0d160211 JF |
731 | } |
732 | ||
2688fcb7 | 733 | static int xennet_get_extras(struct netfront_queue *queue, |
0d160211 JF |
734 | struct xen_netif_extra_info *extras, |
735 | RING_IDX rp) | |
736 | ||
737 | { | |
738 | struct xen_netif_extra_info *extra; | |
2688fcb7 AB |
739 | struct device *dev = &queue->info->netdev->dev; |
740 | RING_IDX cons = queue->rx.rsp_cons; | |
0d160211 JF |
741 | int err = 0; |
742 | ||
743 | do { | |
744 | struct sk_buff *skb; | |
745 | grant_ref_t ref; | |
746 | ||
747 | if (unlikely(cons + 1 == rp)) { | |
748 | if (net_ratelimit()) | |
749 | dev_warn(dev, "Missing extra info\n"); | |
750 | err = -EBADR; | |
751 | break; | |
752 | } | |
753 | ||
754 | extra = (struct xen_netif_extra_info *) | |
2688fcb7 | 755 | RING_GET_RESPONSE(&queue->rx, ++cons); |
0d160211 JF |
756 | |
757 | if (unlikely(!extra->type || | |
758 | extra->type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
759 | if (net_ratelimit()) | |
760 | dev_warn(dev, "Invalid extra type: %d\n", | |
761 | extra->type); | |
762 | err = -EINVAL; | |
763 | } else { | |
764 | memcpy(&extras[extra->type - 1], extra, | |
765 | sizeof(*extra)); | |
766 | } | |
767 | ||
2688fcb7 AB |
768 | skb = xennet_get_rx_skb(queue, cons); |
769 | ref = xennet_get_rx_ref(queue, cons); | |
770 | xennet_move_rx_slot(queue, skb, ref); | |
0d160211 JF |
771 | } while (extra->flags & XEN_NETIF_EXTRA_FLAG_MORE); |
772 | ||
2688fcb7 | 773 | queue->rx.rsp_cons = cons; |
0d160211 JF |
774 | return err; |
775 | } | |
776 | ||
2688fcb7 | 777 | static int xennet_get_responses(struct netfront_queue *queue, |
0d160211 JF |
778 | struct netfront_rx_info *rinfo, RING_IDX rp, |
779 | struct sk_buff_head *list) | |
780 | { | |
781 | struct xen_netif_rx_response *rx = &rinfo->rx; | |
782 | struct xen_netif_extra_info *extras = rinfo->extras; | |
2688fcb7 AB |
783 | struct device *dev = &queue->info->netdev->dev; |
784 | RING_IDX cons = queue->rx.rsp_cons; | |
785 | struct sk_buff *skb = xennet_get_rx_skb(queue, cons); | |
786 | grant_ref_t ref = xennet_get_rx_ref(queue, cons); | |
0d160211 | 787 | int max = MAX_SKB_FRAGS + (rx->status <= RX_COPY_THRESHOLD); |
7158ff6d | 788 | int slots = 1; |
0d160211 JF |
789 | int err = 0; |
790 | unsigned long ret; | |
791 | ||
f942dc25 | 792 | if (rx->flags & XEN_NETRXF_extra_info) { |
2688fcb7 AB |
793 | err = xennet_get_extras(queue, extras, rp); |
794 | cons = queue->rx.rsp_cons; | |
0d160211 JF |
795 | } |
796 | ||
797 | for (;;) { | |
798 | if (unlikely(rx->status < 0 || | |
30c5d7f0 | 799 | rx->offset + rx->status > XEN_PAGE_SIZE)) { |
0d160211 | 800 | if (net_ratelimit()) |
6c10127d | 801 | dev_warn(dev, "rx->offset: %u, size: %d\n", |
0d160211 | 802 | rx->offset, rx->status); |
2688fcb7 | 803 | xennet_move_rx_slot(queue, skb, ref); |
0d160211 JF |
804 | err = -EINVAL; |
805 | goto next; | |
806 | } | |
807 | ||
808 | /* | |
809 | * This definitely indicates a bug, either in this driver or in | |
810 | * the backend driver. In future this should flag the bad | |
697089dc | 811 | * situation to the system controller to reboot the backend. |
0d160211 JF |
812 | */ |
813 | if (ref == GRANT_INVALID_REF) { | |
814 | if (net_ratelimit()) | |
815 | dev_warn(dev, "Bad rx response id %d.\n", | |
816 | rx->id); | |
817 | err = -EINVAL; | |
818 | goto next; | |
819 | } | |
820 | ||
821 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
822 | BUG_ON(!ret); | |
823 | ||
2688fcb7 | 824 | gnttab_release_grant_reference(&queue->gref_rx_head, ref); |
0d160211 JF |
825 | |
826 | __skb_queue_tail(list, skb); | |
827 | ||
828 | next: | |
f942dc25 | 829 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
830 | break; |
831 | ||
7158ff6d | 832 | if (cons + slots == rp) { |
0d160211 | 833 | if (net_ratelimit()) |
7158ff6d | 834 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
835 | err = -ENOENT; |
836 | break; | |
837 | } | |
838 | ||
2688fcb7 AB |
839 | rx = RING_GET_RESPONSE(&queue->rx, cons + slots); |
840 | skb = xennet_get_rx_skb(queue, cons + slots); | |
841 | ref = xennet_get_rx_ref(queue, cons + slots); | |
7158ff6d | 842 | slots++; |
0d160211 JF |
843 | } |
844 | ||
7158ff6d | 845 | if (unlikely(slots > max)) { |
0d160211 | 846 | if (net_ratelimit()) |
697089dc | 847 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
848 | err = -E2BIG; |
849 | } | |
850 | ||
851 | if (unlikely(err)) | |
2688fcb7 | 852 | queue->rx.rsp_cons = cons + slots; |
0d160211 JF |
853 | |
854 | return err; | |
855 | } | |
856 | ||
857 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
858 | struct xen_netif_extra_info *gso) | |
859 | { | |
860 | if (!gso->u.gso.size) { | |
861 | if (net_ratelimit()) | |
383eda32 | 862 | pr_warn("GSO size must not be zero\n"); |
0d160211 JF |
863 | return -EINVAL; |
864 | } | |
865 | ||
2c0057de PD |
866 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
867 | gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { | |
0d160211 | 868 | if (net_ratelimit()) |
383eda32 | 869 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
0d160211 JF |
870 | return -EINVAL; |
871 | } | |
872 | ||
873 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
2c0057de PD |
874 | skb_shinfo(skb)->gso_type = |
875 | (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? | |
876 | SKB_GSO_TCPV4 : | |
877 | SKB_GSO_TCPV6; | |
0d160211 JF |
878 | |
879 | /* Header must be checked, and gso_segs computed. */ | |
880 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
881 | skb_shinfo(skb)->gso_segs = 0; | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
2688fcb7 | 886 | static RING_IDX xennet_fill_frags(struct netfront_queue *queue, |
0d160211 JF |
887 | struct sk_buff *skb, |
888 | struct sk_buff_head *list) | |
889 | { | |
890 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
2688fcb7 | 891 | RING_IDX cons = queue->rx.rsp_cons; |
0d160211 JF |
892 | struct sk_buff *nskb; |
893 | ||
894 | while ((nskb = __skb_dequeue(list))) { | |
895 | struct xen_netif_rx_response *rx = | |
2688fcb7 | 896 | RING_GET_RESPONSE(&queue->rx, ++cons); |
01c68026 | 897 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 898 | |
093b9c71 JB |
899 | if (shinfo->nr_frags == MAX_SKB_FRAGS) { |
900 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; | |
0d160211 | 901 | |
093b9c71 JB |
902 | BUG_ON(pull_to <= skb_headlen(skb)); |
903 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
904 | } | |
905 | BUG_ON(shinfo->nr_frags >= MAX_SKB_FRAGS); | |
906 | ||
907 | skb_add_rx_frag(skb, shinfo->nr_frags, skb_frag_page(nfrag), | |
908 | rx->offset, rx->status, PAGE_SIZE); | |
0d160211 JF |
909 | |
910 | skb_shinfo(nskb)->nr_frags = 0; | |
911 | kfree_skb(nskb); | |
0d160211 JF |
912 | } |
913 | ||
0d160211 JF |
914 | return cons; |
915 | } | |
916 | ||
e0ce4af9 | 917 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 | 918 | { |
b5cf66cd | 919 | bool recalculate_partial_csum = false; |
e0ce4af9 IC |
920 | |
921 | /* | |
922 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
923 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
924 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
925 | * recalculate the partial checksum. | |
926 | */ | |
927 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
928 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 | 929 | atomic_inc(&np->rx_gso_checksum_fixup); |
e0ce4af9 | 930 | skb->ip_summed = CHECKSUM_PARTIAL; |
b5cf66cd | 931 | recalculate_partial_csum = true; |
e0ce4af9 IC |
932 | } |
933 | ||
934 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
935 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
936 | return 0; | |
0d160211 | 937 | |
b5cf66cd | 938 | return skb_checksum_setup(skb, recalculate_partial_csum); |
0d160211 JF |
939 | } |
940 | ||
2688fcb7 | 941 | static int handle_incoming_queue(struct netfront_queue *queue, |
09f75cd7 | 942 | struct sk_buff_head *rxq) |
0d160211 | 943 | { |
900e1833 | 944 | struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); |
0d160211 JF |
945 | int packets_dropped = 0; |
946 | struct sk_buff *skb; | |
947 | ||
948 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 949 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 950 | |
093b9c71 JB |
951 | if (pull_to > skb_headlen(skb)) |
952 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
0d160211 JF |
953 | |
954 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
2688fcb7 | 955 | skb->protocol = eth_type_trans(skb, queue->info->netdev); |
d554f73d | 956 | skb_reset_network_header(skb); |
0d160211 | 957 | |
2688fcb7 | 958 | if (checksum_setup(queue->info->netdev, skb)) { |
e0ce4af9 IC |
959 | kfree_skb(skb); |
960 | packets_dropped++; | |
2688fcb7 | 961 | queue->info->netdev->stats.rx_errors++; |
e0ce4af9 | 962 | continue; |
0d160211 JF |
963 | } |
964 | ||
900e1833 DV |
965 | u64_stats_update_begin(&rx_stats->syncp); |
966 | rx_stats->packets++; | |
967 | rx_stats->bytes += skb->len; | |
968 | u64_stats_update_end(&rx_stats->syncp); | |
0d160211 JF |
969 | |
970 | /* Pass it up. */ | |
2688fcb7 | 971 | napi_gro_receive(&queue->napi, skb); |
0d160211 JF |
972 | } |
973 | ||
974 | return packets_dropped; | |
975 | } | |
976 | ||
bea3348e | 977 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 978 | { |
2688fcb7 AB |
979 | struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); |
980 | struct net_device *dev = queue->info->netdev; | |
0d160211 JF |
981 | struct sk_buff *skb; |
982 | struct netfront_rx_info rinfo; | |
983 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
984 | struct xen_netif_extra_info *extras = rinfo.extras; | |
985 | RING_IDX i, rp; | |
bea3348e | 986 | int work_done; |
0d160211 JF |
987 | struct sk_buff_head rxq; |
988 | struct sk_buff_head errq; | |
989 | struct sk_buff_head tmpq; | |
0d160211 JF |
990 | int err; |
991 | ||
2688fcb7 | 992 | spin_lock(&queue->rx_lock); |
0d160211 | 993 | |
0d160211 JF |
994 | skb_queue_head_init(&rxq); |
995 | skb_queue_head_init(&errq); | |
996 | skb_queue_head_init(&tmpq); | |
997 | ||
2688fcb7 | 998 | rp = queue->rx.sring->rsp_prod; |
0d160211 JF |
999 | rmb(); /* Ensure we see queued responses up to 'rp'. */ |
1000 | ||
2688fcb7 | 1001 | i = queue->rx.rsp_cons; |
0d160211 JF |
1002 | work_done = 0; |
1003 | while ((i != rp) && (work_done < budget)) { | |
2688fcb7 | 1004 | memcpy(rx, RING_GET_RESPONSE(&queue->rx, i), sizeof(*rx)); |
0d160211 JF |
1005 | memset(extras, 0, sizeof(rinfo.extras)); |
1006 | ||
2688fcb7 | 1007 | err = xennet_get_responses(queue, &rinfo, rp, &tmpq); |
0d160211 JF |
1008 | |
1009 | if (unlikely(err)) { | |
1010 | err: | |
1011 | while ((skb = __skb_dequeue(&tmpq))) | |
1012 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 1013 | dev->stats.rx_errors++; |
2688fcb7 | 1014 | i = queue->rx.rsp_cons; |
0d160211 JF |
1015 | continue; |
1016 | } | |
1017 | ||
1018 | skb = __skb_dequeue(&tmpq); | |
1019 | ||
1020 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
1021 | struct xen_netif_extra_info *gso; | |
1022 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1023 | ||
1024 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
1025 | __skb_queue_head(&tmpq, skb); | |
2688fcb7 | 1026 | queue->rx.rsp_cons += skb_queue_len(&tmpq); |
0d160211 JF |
1027 | goto err; |
1028 | } | |
1029 | } | |
1030 | ||
3683243b IC |
1031 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1032 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1033 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1034 | |
3683243b IC |
1035 | skb_shinfo(skb)->frags[0].page_offset = rx->offset; |
1036 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); | |
1037 | skb->data_len = rx->status; | |
093b9c71 | 1038 | skb->len += rx->status; |
0d160211 | 1039 | |
2688fcb7 | 1040 | i = xennet_fill_frags(queue, skb, &tmpq); |
0d160211 | 1041 | |
f942dc25 | 1042 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 1043 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 1044 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1045 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1046 | ||
1047 | __skb_queue_tail(&rxq, skb); | |
1048 | ||
2688fcb7 | 1049 | queue->rx.rsp_cons = ++i; |
0d160211 JF |
1050 | work_done++; |
1051 | } | |
1052 | ||
56cfe5d0 | 1053 | __skb_queue_purge(&errq); |
0d160211 | 1054 | |
2688fcb7 | 1055 | work_done -= handle_incoming_queue(queue, &rxq); |
0d160211 | 1056 | |
2688fcb7 | 1057 | xennet_alloc_rx_buffers(queue); |
0d160211 | 1058 | |
0d160211 | 1059 | if (work_done < budget) { |
bea3348e SH |
1060 | int more_to_do = 0; |
1061 | ||
6a6dc08f | 1062 | napi_complete(napi); |
0d160211 | 1063 | |
2688fcb7 | 1064 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); |
6a6dc08f DV |
1065 | if (more_to_do) |
1066 | napi_schedule(napi); | |
0d160211 JF |
1067 | } |
1068 | ||
2688fcb7 | 1069 | spin_unlock(&queue->rx_lock); |
0d160211 | 1070 | |
bea3348e | 1071 | return work_done; |
0d160211 JF |
1072 | } |
1073 | ||
1074 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1075 | { | |
0c36820e | 1076 | int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; |
0d160211 JF |
1077 | |
1078 | if (mtu > max) | |
1079 | return -EINVAL; | |
1080 | dev->mtu = mtu; | |
1081 | return 0; | |
1082 | } | |
1083 | ||
e00f85be | 1084 | static struct rtnl_link_stats64 *xennet_get_stats64(struct net_device *dev, |
1085 | struct rtnl_link_stats64 *tot) | |
1086 | { | |
1087 | struct netfront_info *np = netdev_priv(dev); | |
1088 | int cpu; | |
1089 | ||
1090 | for_each_possible_cpu(cpu) { | |
900e1833 DV |
1091 | struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); |
1092 | struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); | |
e00f85be | 1093 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
1094 | unsigned int start; | |
1095 | ||
1096 | do { | |
900e1833 DV |
1097 | start = u64_stats_fetch_begin_irq(&tx_stats->syncp); |
1098 | tx_packets = tx_stats->packets; | |
1099 | tx_bytes = tx_stats->bytes; | |
1100 | } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); | |
e00f85be | 1101 | |
900e1833 DV |
1102 | do { |
1103 | start = u64_stats_fetch_begin_irq(&rx_stats->syncp); | |
1104 | rx_packets = rx_stats->packets; | |
1105 | rx_bytes = rx_stats->bytes; | |
1106 | } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); | |
e00f85be | 1107 | |
1108 | tot->rx_packets += rx_packets; | |
1109 | tot->tx_packets += tx_packets; | |
1110 | tot->rx_bytes += rx_bytes; | |
1111 | tot->tx_bytes += tx_bytes; | |
1112 | } | |
1113 | ||
1114 | tot->rx_errors = dev->stats.rx_errors; | |
1115 | tot->tx_dropped = dev->stats.tx_dropped; | |
1116 | ||
1117 | return tot; | |
1118 | } | |
1119 | ||
2688fcb7 | 1120 | static void xennet_release_tx_bufs(struct netfront_queue *queue) |
0d160211 JF |
1121 | { |
1122 | struct sk_buff *skb; | |
1123 | int i; | |
1124 | ||
1125 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1126 | /* Skip over entries which are actually freelist references */ | |
2688fcb7 | 1127 | if (skb_entry_is_link(&queue->tx_skbs[i])) |
0d160211 JF |
1128 | continue; |
1129 | ||
2688fcb7 AB |
1130 | skb = queue->tx_skbs[i].skb; |
1131 | get_page(queue->grant_tx_page[i]); | |
1132 | gnttab_end_foreign_access(queue->grant_tx_ref[i], | |
cefe0078 | 1133 | GNTMAP_readonly, |
2688fcb7 AB |
1134 | (unsigned long)page_address(queue->grant_tx_page[i])); |
1135 | queue->grant_tx_page[i] = NULL; | |
1136 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1137 | add_id_to_freelist(&queue->tx_skb_freelist, queue->tx_skbs, i); | |
0d160211 JF |
1138 | dev_kfree_skb_irq(skb); |
1139 | } | |
1140 | } | |
1141 | ||
2688fcb7 | 1142 | static void xennet_release_rx_bufs(struct netfront_queue *queue) |
0d160211 | 1143 | { |
0d160211 JF |
1144 | int id, ref; |
1145 | ||
2688fcb7 | 1146 | spin_lock_bh(&queue->rx_lock); |
0d160211 JF |
1147 | |
1148 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
cefe0078 AL |
1149 | struct sk_buff *skb; |
1150 | struct page *page; | |
0d160211 | 1151 | |
2688fcb7 | 1152 | skb = queue->rx_skbs[id]; |
cefe0078 | 1153 | if (!skb) |
0d160211 | 1154 | continue; |
0d160211 | 1155 | |
2688fcb7 | 1156 | ref = queue->grant_rx_ref[id]; |
cefe0078 AL |
1157 | if (ref == GRANT_INVALID_REF) |
1158 | continue; | |
0d160211 | 1159 | |
cefe0078 | 1160 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
0d160211 | 1161 | |
cefe0078 AL |
1162 | /* gnttab_end_foreign_access() needs a page ref until |
1163 | * foreign access is ended (which may be deferred). | |
1164 | */ | |
1165 | get_page(page); | |
1166 | gnttab_end_foreign_access(ref, 0, | |
1167 | (unsigned long)page_address(page)); | |
2688fcb7 | 1168 | queue->grant_rx_ref[id] = GRANT_INVALID_REF; |
0d160211 | 1169 | |
cefe0078 | 1170 | kfree_skb(skb); |
0d160211 JF |
1171 | } |
1172 | ||
2688fcb7 | 1173 | spin_unlock_bh(&queue->rx_lock); |
0d160211 JF |
1174 | } |
1175 | ||
c8f44aff MM |
1176 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1177 | netdev_features_t features) | |
8f7b01a1 ED |
1178 | { |
1179 | struct netfront_info *np = netdev_priv(dev); | |
8f7b01a1 | 1180 | |
2890ea5c JG |
1181 | if (features & NETIF_F_SG && |
1182 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) | |
1183 | features &= ~NETIF_F_SG; | |
8f7b01a1 | 1184 | |
2890ea5c JG |
1185 | if (features & NETIF_F_IPV6_CSUM && |
1186 | !xenbus_read_unsigned(np->xbdev->otherend, | |
1187 | "feature-ipv6-csum-offload", 0)) | |
1188 | features &= ~NETIF_F_IPV6_CSUM; | |
8f7b01a1 | 1189 | |
2890ea5c JG |
1190 | if (features & NETIF_F_TSO && |
1191 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) | |
1192 | features &= ~NETIF_F_TSO; | |
8f7b01a1 | 1193 | |
2890ea5c JG |
1194 | if (features & NETIF_F_TSO6 && |
1195 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) | |
1196 | features &= ~NETIF_F_TSO6; | |
2c0057de | 1197 | |
8f7b01a1 ED |
1198 | return features; |
1199 | } | |
1200 | ||
c8f44aff MM |
1201 | static int xennet_set_features(struct net_device *dev, |
1202 | netdev_features_t features) | |
8f7b01a1 ED |
1203 | { |
1204 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1205 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1206 | dev->mtu = ETH_DATA_LEN; | |
1207 | } | |
1208 | ||
1209 | return 0; | |
1210 | } | |
1211 | ||
d634bf2c | 1212 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
cf66f9d4 | 1213 | { |
2688fcb7 | 1214 | struct netfront_queue *queue = dev_id; |
cf66f9d4 KRW |
1215 | unsigned long flags; |
1216 | ||
2688fcb7 AB |
1217 | spin_lock_irqsave(&queue->tx_lock, flags); |
1218 | xennet_tx_buf_gc(queue); | |
1219 | spin_unlock_irqrestore(&queue->tx_lock, flags); | |
cf66f9d4 | 1220 | |
d634bf2c WL |
1221 | return IRQ_HANDLED; |
1222 | } | |
1223 | ||
1224 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) | |
1225 | { | |
2688fcb7 AB |
1226 | struct netfront_queue *queue = dev_id; |
1227 | struct net_device *dev = queue->info->netdev; | |
d634bf2c WL |
1228 | |
1229 | if (likely(netif_carrier_ok(dev) && | |
2688fcb7 | 1230 | RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) |
76541869 | 1231 | napi_schedule(&queue->napi); |
cf66f9d4 | 1232 | |
d634bf2c WL |
1233 | return IRQ_HANDLED; |
1234 | } | |
cf66f9d4 | 1235 | |
d634bf2c WL |
1236 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1237 | { | |
1238 | xennet_tx_interrupt(irq, dev_id); | |
1239 | xennet_rx_interrupt(irq, dev_id); | |
cf66f9d4 KRW |
1240 | return IRQ_HANDLED; |
1241 | } | |
1242 | ||
1243 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1244 | static void xennet_poll_controller(struct net_device *dev) | |
1245 | { | |
2688fcb7 AB |
1246 | /* Poll each queue */ |
1247 | struct netfront_info *info = netdev_priv(dev); | |
1248 | unsigned int num_queues = dev->real_num_tx_queues; | |
1249 | unsigned int i; | |
1250 | for (i = 0; i < num_queues; ++i) | |
1251 | xennet_interrupt(0, &info->queues[i]); | |
cf66f9d4 KRW |
1252 | } |
1253 | #endif | |
1254 | ||
0a0b9d2e SH |
1255 | static const struct net_device_ops xennet_netdev_ops = { |
1256 | .ndo_open = xennet_open, | |
0a0b9d2e SH |
1257 | .ndo_stop = xennet_close, |
1258 | .ndo_start_xmit = xennet_start_xmit, | |
1259 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1260 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1261 | .ndo_set_mac_address = eth_mac_addr, |
1262 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1263 | .ndo_fix_features = xennet_fix_features, |
1264 | .ndo_set_features = xennet_set_features, | |
2688fcb7 | 1265 | .ndo_select_queue = xennet_select_queue, |
cf66f9d4 KRW |
1266 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1267 | .ndo_poll_controller = xennet_poll_controller, | |
1268 | #endif | |
0a0b9d2e SH |
1269 | }; |
1270 | ||
900e1833 DV |
1271 | static void xennet_free_netdev(struct net_device *netdev) |
1272 | { | |
1273 | struct netfront_info *np = netdev_priv(netdev); | |
1274 | ||
1275 | free_percpu(np->rx_stats); | |
1276 | free_percpu(np->tx_stats); | |
1277 | free_netdev(netdev); | |
1278 | } | |
1279 | ||
8e0e46bb | 1280 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 | 1281 | { |
2688fcb7 | 1282 | int err; |
0d160211 JF |
1283 | struct net_device *netdev; |
1284 | struct netfront_info *np; | |
1285 | ||
50ee6061 | 1286 | netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); |
41de8d4c | 1287 | if (!netdev) |
0d160211 | 1288 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1289 | |
1290 | np = netdev_priv(netdev); | |
1291 | np->xbdev = dev; | |
1292 | ||
2688fcb7 | 1293 | np->queues = NULL; |
0d160211 | 1294 | |
e00f85be | 1295 | err = -ENOMEM; |
900e1833 DV |
1296 | np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
1297 | if (np->rx_stats == NULL) | |
1298 | goto exit; | |
1299 | np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); | |
1300 | if (np->tx_stats == NULL) | |
e00f85be | 1301 | goto exit; |
1302 | ||
0a0b9d2e SH |
1303 | netdev->netdev_ops = &xennet_netdev_ops; |
1304 | ||
fb507934 MM |
1305 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1306 | NETIF_F_GSO_ROBUST; | |
2c0057de PD |
1307 | netdev->hw_features = NETIF_F_SG | |
1308 | NETIF_F_IPV6_CSUM | | |
1309 | NETIF_F_TSO | NETIF_F_TSO6; | |
0d160211 | 1310 | |
fc3e5941 IC |
1311 | /* |
1312 | * Assume that all hw features are available for now. This set | |
1313 | * will be adjusted by the call to netdev_update_features() in | |
1314 | * xennet_connect() which is the earliest point where we can | |
1315 | * negotiate with the backend regarding supported features. | |
1316 | */ | |
1317 | netdev->features |= netdev->hw_features; | |
1318 | ||
7ad24ea4 | 1319 | netdev->ethtool_ops = &xennet_ethtool_ops; |
d0c2c997 JW |
1320 | netdev->min_mtu = 0; |
1321 | netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; | |
0d160211 JF |
1322 | SET_NETDEV_DEV(netdev, &dev->dev); |
1323 | ||
1324 | np->netdev = netdev; | |
1325 | ||
1326 | netif_carrier_off(netdev); | |
1327 | ||
1328 | return netdev; | |
1329 | ||
0d160211 | 1330 | exit: |
900e1833 | 1331 | xennet_free_netdev(netdev); |
0d160211 JF |
1332 | return ERR_PTR(err); |
1333 | } | |
1334 | ||
1335 | /** | |
1336 | * Entry point to this code when a new device is created. Allocate the basic | |
1337 | * structures and the ring buffers for communication with the backend, and | |
1338 | * inform the backend of the appropriate details for those. | |
1339 | */ | |
8e0e46bb | 1340 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1341 | const struct xenbus_device_id *id) |
0d160211 JF |
1342 | { |
1343 | int err; | |
1344 | struct net_device *netdev; | |
1345 | struct netfront_info *info; | |
1346 | ||
1347 | netdev = xennet_create_dev(dev); | |
1348 | if (IS_ERR(netdev)) { | |
1349 | err = PTR_ERR(netdev); | |
1350 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1351 | return err; | |
1352 | } | |
1353 | ||
1354 | info = netdev_priv(netdev); | |
1b713e00 | 1355 | dev_set_drvdata(&dev->dev, info); |
27b917e5 TI |
1356 | #ifdef CONFIG_SYSFS |
1357 | info->netdev->sysfs_groups[0] = &xennet_dev_group; | |
1358 | #endif | |
0d160211 JF |
1359 | err = register_netdev(info->netdev); |
1360 | if (err) { | |
383eda32 | 1361 | pr_warn("%s: register_netdev err=%d\n", __func__, err); |
0d160211 JF |
1362 | goto fail; |
1363 | } | |
1364 | ||
0d160211 JF |
1365 | return 0; |
1366 | ||
1367 | fail: | |
900e1833 | 1368 | xennet_free_netdev(netdev); |
1b713e00 | 1369 | dev_set_drvdata(&dev->dev, NULL); |
0d160211 JF |
1370 | return err; |
1371 | } | |
1372 | ||
1373 | static void xennet_end_access(int ref, void *page) | |
1374 | { | |
1375 | /* This frees the page as a side-effect */ | |
1376 | if (ref != GRANT_INVALID_REF) | |
1377 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1378 | } | |
1379 | ||
1380 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1381 | { | |
2688fcb7 | 1382 | unsigned int i = 0; |
2688fcb7 AB |
1383 | unsigned int num_queues = info->netdev->real_num_tx_queues; |
1384 | ||
f9feb1e6 DV |
1385 | netif_carrier_off(info->netdev); |
1386 | ||
9a873c71 | 1387 | for (i = 0; i < num_queues && info->queues; ++i) { |
76541869 DV |
1388 | struct netfront_queue *queue = &info->queues[i]; |
1389 | ||
74470954 BO |
1390 | del_timer_sync(&queue->rx_refill_timer); |
1391 | ||
2688fcb7 AB |
1392 | if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) |
1393 | unbind_from_irqhandler(queue->tx_irq, queue); | |
1394 | if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { | |
1395 | unbind_from_irqhandler(queue->tx_irq, queue); | |
1396 | unbind_from_irqhandler(queue->rx_irq, queue); | |
1397 | } | |
1398 | queue->tx_evtchn = queue->rx_evtchn = 0; | |
1399 | queue->tx_irq = queue->rx_irq = 0; | |
0d160211 | 1400 | |
274b0455 CW |
1401 | if (netif_running(info->netdev)) |
1402 | napi_synchronize(&queue->napi); | |
f9feb1e6 | 1403 | |
a5b5dc3c DV |
1404 | xennet_release_tx_bufs(queue); |
1405 | xennet_release_rx_bufs(queue); | |
1406 | gnttab_free_grant_references(queue->gref_tx_head); | |
1407 | gnttab_free_grant_references(queue->gref_rx_head); | |
1408 | ||
2688fcb7 AB |
1409 | /* End access and free the pages */ |
1410 | xennet_end_access(queue->tx_ring_ref, queue->tx.sring); | |
1411 | xennet_end_access(queue->rx_ring_ref, queue->rx.sring); | |
0d160211 | 1412 | |
2688fcb7 AB |
1413 | queue->tx_ring_ref = GRANT_INVALID_REF; |
1414 | queue->rx_ring_ref = GRANT_INVALID_REF; | |
1415 | queue->tx.sring = NULL; | |
1416 | queue->rx.sring = NULL; | |
1417 | } | |
0d160211 JF |
1418 | } |
1419 | ||
1420 | /** | |
1421 | * We are reconnecting to the backend, due to a suspend/resume, or a backend | |
1422 | * driver restart. We tear down our netif structure and recreate it, but | |
1423 | * leave the device-layer structures intact so that this is transparent to the | |
1424 | * rest of the kernel. | |
1425 | */ | |
1426 | static int netfront_resume(struct xenbus_device *dev) | |
1427 | { | |
1b713e00 | 1428 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1429 | |
1430 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1431 | ||
1432 | xennet_disconnect_backend(info); | |
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1437 | { | |
1438 | char *s, *e, *macstr; | |
1439 | int i; | |
1440 | ||
1441 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1442 | if (IS_ERR(macstr)) | |
1443 | return PTR_ERR(macstr); | |
1444 | ||
1445 | for (i = 0; i < ETH_ALEN; i++) { | |
1446 | mac[i] = simple_strtoul(s, &e, 16); | |
1447 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1448 | kfree(macstr); | |
1449 | return -ENOENT; | |
1450 | } | |
1451 | s = e+1; | |
1452 | } | |
1453 | ||
1454 | kfree(macstr); | |
1455 | return 0; | |
1456 | } | |
1457 | ||
2688fcb7 | 1458 | static int setup_netfront_single(struct netfront_queue *queue) |
d634bf2c WL |
1459 | { |
1460 | int err; | |
1461 | ||
2688fcb7 | 1462 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
d634bf2c WL |
1463 | if (err < 0) |
1464 | goto fail; | |
1465 | ||
2688fcb7 | 1466 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
d634bf2c | 1467 | xennet_interrupt, |
2688fcb7 | 1468 | 0, queue->info->netdev->name, queue); |
d634bf2c WL |
1469 | if (err < 0) |
1470 | goto bind_fail; | |
2688fcb7 AB |
1471 | queue->rx_evtchn = queue->tx_evtchn; |
1472 | queue->rx_irq = queue->tx_irq = err; | |
d634bf2c WL |
1473 | |
1474 | return 0; | |
1475 | ||
1476 | bind_fail: | |
2688fcb7 AB |
1477 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
1478 | queue->tx_evtchn = 0; | |
d634bf2c WL |
1479 | fail: |
1480 | return err; | |
1481 | } | |
1482 | ||
2688fcb7 | 1483 | static int setup_netfront_split(struct netfront_queue *queue) |
d634bf2c WL |
1484 | { |
1485 | int err; | |
1486 | ||
2688fcb7 | 1487 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
d634bf2c WL |
1488 | if (err < 0) |
1489 | goto fail; | |
2688fcb7 | 1490 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); |
d634bf2c WL |
1491 | if (err < 0) |
1492 | goto alloc_rx_evtchn_fail; | |
1493 | ||
2688fcb7 AB |
1494 | snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
1495 | "%s-tx", queue->name); | |
1496 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, | |
d634bf2c | 1497 | xennet_tx_interrupt, |
2688fcb7 | 1498 | 0, queue->tx_irq_name, queue); |
d634bf2c WL |
1499 | if (err < 0) |
1500 | goto bind_tx_fail; | |
2688fcb7 | 1501 | queue->tx_irq = err; |
d634bf2c | 1502 | |
2688fcb7 AB |
1503 | snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
1504 | "%s-rx", queue->name); | |
1505 | err = bind_evtchn_to_irqhandler(queue->rx_evtchn, | |
d634bf2c | 1506 | xennet_rx_interrupt, |
2688fcb7 | 1507 | 0, queue->rx_irq_name, queue); |
d634bf2c WL |
1508 | if (err < 0) |
1509 | goto bind_rx_fail; | |
2688fcb7 | 1510 | queue->rx_irq = err; |
d634bf2c WL |
1511 | |
1512 | return 0; | |
1513 | ||
1514 | bind_rx_fail: | |
2688fcb7 AB |
1515 | unbind_from_irqhandler(queue->tx_irq, queue); |
1516 | queue->tx_irq = 0; | |
d634bf2c | 1517 | bind_tx_fail: |
2688fcb7 AB |
1518 | xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); |
1519 | queue->rx_evtchn = 0; | |
d634bf2c | 1520 | alloc_rx_evtchn_fail: |
2688fcb7 AB |
1521 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
1522 | queue->tx_evtchn = 0; | |
d634bf2c WL |
1523 | fail: |
1524 | return err; | |
1525 | } | |
1526 | ||
2688fcb7 AB |
1527 | static int setup_netfront(struct xenbus_device *dev, |
1528 | struct netfront_queue *queue, unsigned int feature_split_evtchn) | |
0d160211 JF |
1529 | { |
1530 | struct xen_netif_tx_sring *txs; | |
1531 | struct xen_netif_rx_sring *rxs; | |
ccc9d90a | 1532 | grant_ref_t gref; |
0d160211 | 1533 | int err; |
0d160211 | 1534 | |
2688fcb7 AB |
1535 | queue->tx_ring_ref = GRANT_INVALID_REF; |
1536 | queue->rx_ring_ref = GRANT_INVALID_REF; | |
1537 | queue->rx.sring = NULL; | |
1538 | queue->tx.sring = NULL; | |
0d160211 | 1539 | |
a144ff09 | 1540 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1541 | if (!txs) { |
1542 | err = -ENOMEM; | |
1543 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1544 | goto fail; | |
1545 | } | |
1546 | SHARED_RING_INIT(txs); | |
30c5d7f0 | 1547 | FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
0d160211 | 1548 | |
ccc9d90a | 1549 | err = xenbus_grant_ring(dev, txs, 1, &gref); |
1ca2983a WL |
1550 | if (err < 0) |
1551 | goto grant_tx_ring_fail; | |
ccc9d90a | 1552 | queue->tx_ring_ref = gref; |
0d160211 | 1553 | |
a144ff09 | 1554 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1555 | if (!rxs) { |
1556 | err = -ENOMEM; | |
1557 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1ca2983a | 1558 | goto alloc_rx_ring_fail; |
0d160211 JF |
1559 | } |
1560 | SHARED_RING_INIT(rxs); | |
30c5d7f0 | 1561 | FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
0d160211 | 1562 | |
ccc9d90a | 1563 | err = xenbus_grant_ring(dev, rxs, 1, &gref); |
1ca2983a WL |
1564 | if (err < 0) |
1565 | goto grant_rx_ring_fail; | |
ccc9d90a | 1566 | queue->rx_ring_ref = gref; |
0d160211 | 1567 | |
d634bf2c | 1568 | if (feature_split_evtchn) |
2688fcb7 | 1569 | err = setup_netfront_split(queue); |
d634bf2c WL |
1570 | /* setup single event channel if |
1571 | * a) feature-split-event-channels == 0 | |
1572 | * b) feature-split-event-channels == 1 but failed to setup | |
1573 | */ | |
1574 | if (!feature_split_evtchn || (feature_split_evtchn && err)) | |
2688fcb7 | 1575 | err = setup_netfront_single(queue); |
d634bf2c | 1576 | |
0d160211 | 1577 | if (err) |
1ca2983a | 1578 | goto alloc_evtchn_fail; |
0d160211 | 1579 | |
0d160211 JF |
1580 | return 0; |
1581 | ||
1ca2983a WL |
1582 | /* If we fail to setup netfront, it is safe to just revoke access to |
1583 | * granted pages because backend is not accessing it at this point. | |
1584 | */ | |
1ca2983a | 1585 | alloc_evtchn_fail: |
2688fcb7 | 1586 | gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); |
1ca2983a WL |
1587 | grant_rx_ring_fail: |
1588 | free_page((unsigned long)rxs); | |
1589 | alloc_rx_ring_fail: | |
2688fcb7 | 1590 | gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); |
1ca2983a WL |
1591 | grant_tx_ring_fail: |
1592 | free_page((unsigned long)txs); | |
1593 | fail: | |
0d160211 JF |
1594 | return err; |
1595 | } | |
1596 | ||
2688fcb7 AB |
1597 | /* Queue-specific initialisation |
1598 | * This used to be done in xennet_create_dev() but must now | |
1599 | * be run per-queue. | |
1600 | */ | |
1601 | static int xennet_init_queue(struct netfront_queue *queue) | |
1602 | { | |
1603 | unsigned short i; | |
1604 | int err = 0; | |
1605 | ||
1606 | spin_lock_init(&queue->tx_lock); | |
1607 | spin_lock_init(&queue->rx_lock); | |
1608 | ||
493be55a VT |
1609 | setup_timer(&queue->rx_refill_timer, rx_refill_timeout, |
1610 | (unsigned long)queue); | |
2688fcb7 | 1611 | |
8b715010 WL |
1612 | snprintf(queue->name, sizeof(queue->name), "%s-q%u", |
1613 | queue->info->netdev->name, queue->id); | |
1614 | ||
2688fcb7 AB |
1615 | /* Initialise tx_skbs as a free chain containing every entry. */ |
1616 | queue->tx_skb_freelist = 0; | |
1617 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1618 | skb_entry_set_link(&queue->tx_skbs[i], i+1); | |
1619 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; | |
1620 | queue->grant_tx_page[i] = NULL; | |
1621 | } | |
1622 | ||
1623 | /* Clear out rx_skbs */ | |
1624 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1625 | queue->rx_skbs[i] = NULL; | |
1626 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1627 | } | |
1628 | ||
1629 | /* A grant for every tx ring slot */ | |
1f3c2eba | 1630 | if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, |
2688fcb7 AB |
1631 | &queue->gref_tx_head) < 0) { |
1632 | pr_alert("can't alloc tx grant refs\n"); | |
1633 | err = -ENOMEM; | |
1634 | goto exit; | |
1635 | } | |
1636 | ||
1637 | /* A grant for every rx ring slot */ | |
1f3c2eba | 1638 | if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, |
2688fcb7 AB |
1639 | &queue->gref_rx_head) < 0) { |
1640 | pr_alert("can't alloc rx grant refs\n"); | |
1641 | err = -ENOMEM; | |
1642 | goto exit_free_tx; | |
1643 | } | |
1644 | ||
2688fcb7 AB |
1645 | return 0; |
1646 | ||
1647 | exit_free_tx: | |
1648 | gnttab_free_grant_references(queue->gref_tx_head); | |
1649 | exit: | |
1650 | return err; | |
1651 | } | |
1652 | ||
50ee6061 AB |
1653 | static int write_queue_xenstore_keys(struct netfront_queue *queue, |
1654 | struct xenbus_transaction *xbt, int write_hierarchical) | |
1655 | { | |
1656 | /* Write the queue-specific keys into XenStore in the traditional | |
1657 | * way for a single queue, or in a queue subkeys for multiple | |
1658 | * queues. | |
1659 | */ | |
1660 | struct xenbus_device *dev = queue->info->xbdev; | |
1661 | int err; | |
1662 | const char *message; | |
1663 | char *path; | |
1664 | size_t pathsize; | |
1665 | ||
1666 | /* Choose the correct place to write the keys */ | |
1667 | if (write_hierarchical) { | |
1668 | pathsize = strlen(dev->nodename) + 10; | |
1669 | path = kzalloc(pathsize, GFP_KERNEL); | |
1670 | if (!path) { | |
1671 | err = -ENOMEM; | |
1672 | message = "out of memory while writing ring references"; | |
1673 | goto error; | |
1674 | } | |
1675 | snprintf(path, pathsize, "%s/queue-%u", | |
1676 | dev->nodename, queue->id); | |
1677 | } else { | |
1678 | path = (char *)dev->nodename; | |
1679 | } | |
1680 | ||
1681 | /* Write ring references */ | |
1682 | err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", | |
1683 | queue->tx_ring_ref); | |
1684 | if (err) { | |
1685 | message = "writing tx-ring-ref"; | |
1686 | goto error; | |
1687 | } | |
1688 | ||
1689 | err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", | |
1690 | queue->rx_ring_ref); | |
1691 | if (err) { | |
1692 | message = "writing rx-ring-ref"; | |
1693 | goto error; | |
1694 | } | |
1695 | ||
1696 | /* Write event channels; taking into account both shared | |
1697 | * and split event channel scenarios. | |
1698 | */ | |
1699 | if (queue->tx_evtchn == queue->rx_evtchn) { | |
1700 | /* Shared event channel */ | |
1701 | err = xenbus_printf(*xbt, path, | |
1702 | "event-channel", "%u", queue->tx_evtchn); | |
1703 | if (err) { | |
1704 | message = "writing event-channel"; | |
1705 | goto error; | |
1706 | } | |
1707 | } else { | |
1708 | /* Split event channels */ | |
1709 | err = xenbus_printf(*xbt, path, | |
1710 | "event-channel-tx", "%u", queue->tx_evtchn); | |
1711 | if (err) { | |
1712 | message = "writing event-channel-tx"; | |
1713 | goto error; | |
1714 | } | |
1715 | ||
1716 | err = xenbus_printf(*xbt, path, | |
1717 | "event-channel-rx", "%u", queue->rx_evtchn); | |
1718 | if (err) { | |
1719 | message = "writing event-channel-rx"; | |
1720 | goto error; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | if (write_hierarchical) | |
1725 | kfree(path); | |
1726 | return 0; | |
1727 | ||
1728 | error: | |
1729 | if (write_hierarchical) | |
1730 | kfree(path); | |
1731 | xenbus_dev_fatal(dev, err, "%s", message); | |
1732 | return err; | |
1733 | } | |
1734 | ||
ce58725f DV |
1735 | static void xennet_destroy_queues(struct netfront_info *info) |
1736 | { | |
1737 | unsigned int i; | |
1738 | ||
1739 | rtnl_lock(); | |
1740 | ||
1741 | for (i = 0; i < info->netdev->real_num_tx_queues; i++) { | |
1742 | struct netfront_queue *queue = &info->queues[i]; | |
1743 | ||
1744 | if (netif_running(info->netdev)) | |
1745 | napi_disable(&queue->napi); | |
1746 | netif_napi_del(&queue->napi); | |
1747 | } | |
1748 | ||
1749 | rtnl_unlock(); | |
1750 | ||
1751 | kfree(info->queues); | |
1752 | info->queues = NULL; | |
1753 | } | |
1754 | ||
1755 | static int xennet_create_queues(struct netfront_info *info, | |
ca88ea12 | 1756 | unsigned int *num_queues) |
ce58725f DV |
1757 | { |
1758 | unsigned int i; | |
1759 | int ret; | |
1760 | ||
ca88ea12 | 1761 | info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), |
ce58725f DV |
1762 | GFP_KERNEL); |
1763 | if (!info->queues) | |
1764 | return -ENOMEM; | |
1765 | ||
1766 | rtnl_lock(); | |
1767 | ||
ca88ea12 | 1768 | for (i = 0; i < *num_queues; i++) { |
ce58725f DV |
1769 | struct netfront_queue *queue = &info->queues[i]; |
1770 | ||
1771 | queue->id = i; | |
1772 | queue->info = info; | |
1773 | ||
1774 | ret = xennet_init_queue(queue); | |
1775 | if (ret < 0) { | |
69cb8524 DV |
1776 | dev_warn(&info->netdev->dev, |
1777 | "only created %d queues\n", i); | |
ca88ea12 | 1778 | *num_queues = i; |
ce58725f DV |
1779 | break; |
1780 | } | |
1781 | ||
1782 | netif_napi_add(queue->info->netdev, &queue->napi, | |
1783 | xennet_poll, 64); | |
1784 | if (netif_running(info->netdev)) | |
1785 | napi_enable(&queue->napi); | |
1786 | } | |
1787 | ||
ca88ea12 | 1788 | netif_set_real_num_tx_queues(info->netdev, *num_queues); |
ce58725f DV |
1789 | |
1790 | rtnl_unlock(); | |
1791 | ||
ca88ea12 | 1792 | if (*num_queues == 0) { |
ce58725f DV |
1793 | dev_err(&info->netdev->dev, "no queues\n"); |
1794 | return -EINVAL; | |
1795 | } | |
1796 | return 0; | |
1797 | } | |
1798 | ||
0d160211 | 1799 | /* Common code used when first setting up, and when resuming. */ |
f502bf2b | 1800 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
1801 | struct netfront_info *info) |
1802 | { | |
1803 | const char *message; | |
1804 | struct xenbus_transaction xbt; | |
1805 | int err; | |
2688fcb7 AB |
1806 | unsigned int feature_split_evtchn; |
1807 | unsigned int i = 0; | |
50ee6061 | 1808 | unsigned int max_queues = 0; |
2688fcb7 AB |
1809 | struct netfront_queue *queue = NULL; |
1810 | unsigned int num_queues = 1; | |
0d160211 | 1811 | |
2688fcb7 AB |
1812 | info->netdev->irq = 0; |
1813 | ||
50ee6061 | 1814 | /* Check if backend supports multiple queues */ |
2890ea5c JG |
1815 | max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
1816 | "multi-queue-max-queues", 1); | |
50ee6061 AB |
1817 | num_queues = min(max_queues, xennet_max_queues); |
1818 | ||
2688fcb7 | 1819 | /* Check feature-split-event-channels */ |
2890ea5c JG |
1820 | feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, |
1821 | "feature-split-event-channels", 0); | |
2688fcb7 AB |
1822 | |
1823 | /* Read mac addr. */ | |
1824 | err = xen_net_read_mac(dev, info->netdev->dev_addr); | |
1825 | if (err) { | |
1826 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
1827 | goto out; | |
1828 | } | |
1829 | ||
ce58725f DV |
1830 | if (info->queues) |
1831 | xennet_destroy_queues(info); | |
1832 | ||
ca88ea12 | 1833 | err = xennet_create_queues(info, &num_queues); |
e2e004ac RL |
1834 | if (err < 0) { |
1835 | xenbus_dev_fatal(dev, err, "creating queues"); | |
1836 | kfree(info->queues); | |
1837 | info->queues = NULL; | |
1838 | goto out; | |
1839 | } | |
2688fcb7 AB |
1840 | |
1841 | /* Create shared ring, alloc event channel -- for each queue */ | |
1842 | for (i = 0; i < num_queues; ++i) { | |
1843 | queue = &info->queues[i]; | |
2688fcb7 | 1844 | err = setup_netfront(dev, queue, feature_split_evtchn); |
e2e004ac RL |
1845 | if (err) |
1846 | goto destroy_ring; | |
2688fcb7 | 1847 | } |
0d160211 JF |
1848 | |
1849 | again: | |
1850 | err = xenbus_transaction_start(&xbt); | |
1851 | if (err) { | |
1852 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
1853 | goto destroy_ring; | |
1854 | } | |
1855 | ||
812494d9 | 1856 | if (xenbus_exists(XBT_NIL, |
1857 | info->xbdev->otherend, "multi-queue-max-queues")) { | |
50ee6061 | 1858 | /* Write the number of queues */ |
812494d9 | 1859 | err = xenbus_printf(xbt, dev->nodename, |
1860 | "multi-queue-num-queues", "%u", num_queues); | |
d634bf2c | 1861 | if (err) { |
50ee6061 AB |
1862 | message = "writing multi-queue-num-queues"; |
1863 | goto abort_transaction_no_dev_fatal; | |
d634bf2c | 1864 | } |
812494d9 | 1865 | } |
50ee6061 | 1866 | |
812494d9 | 1867 | if (num_queues == 1) { |
1868 | err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ | |
1869 | if (err) | |
1870 | goto abort_transaction_no_dev_fatal; | |
1871 | } else { | |
50ee6061 AB |
1872 | /* Write the keys for each queue */ |
1873 | for (i = 0; i < num_queues; ++i) { | |
1874 | queue = &info->queues[i]; | |
1875 | err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ | |
1876 | if (err) | |
1877 | goto abort_transaction_no_dev_fatal; | |
d634bf2c | 1878 | } |
0d160211 JF |
1879 | } |
1880 | ||
50ee6061 | 1881 | /* The remaining keys are not queue-specific */ |
0d160211 JF |
1882 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
1883 | 1); | |
1884 | if (err) { | |
1885 | message = "writing request-rx-copy"; | |
1886 | goto abort_transaction; | |
1887 | } | |
1888 | ||
1889 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
1890 | if (err) { | |
1891 | message = "writing feature-rx-notify"; | |
1892 | goto abort_transaction; | |
1893 | } | |
1894 | ||
1895 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
1896 | if (err) { | |
1897 | message = "writing feature-sg"; | |
1898 | goto abort_transaction; | |
1899 | } | |
1900 | ||
1901 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
1902 | if (err) { | |
1903 | message = "writing feature-gso-tcpv4"; | |
1904 | goto abort_transaction; | |
1905 | } | |
1906 | ||
2c0057de PD |
1907 | err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
1908 | if (err) { | |
1909 | message = "writing feature-gso-tcpv6"; | |
1910 | goto abort_transaction; | |
1911 | } | |
1912 | ||
1913 | err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", | |
1914 | "1"); | |
1915 | if (err) { | |
1916 | message = "writing feature-ipv6-csum-offload"; | |
1917 | goto abort_transaction; | |
1918 | } | |
1919 | ||
0d160211 JF |
1920 | err = xenbus_transaction_end(xbt, 0); |
1921 | if (err) { | |
1922 | if (err == -EAGAIN) | |
1923 | goto again; | |
1924 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
1925 | goto destroy_ring; | |
1926 | } | |
1927 | ||
1928 | return 0; | |
1929 | ||
1930 | abort_transaction: | |
0d160211 | 1931 | xenbus_dev_fatal(dev, err, "%s", message); |
50ee6061 AB |
1932 | abort_transaction_no_dev_fatal: |
1933 | xenbus_transaction_end(xbt, 1); | |
0d160211 JF |
1934 | destroy_ring: |
1935 | xennet_disconnect_backend(info); | |
e2e004ac | 1936 | xennet_destroy_queues(info); |
0d160211 | 1937 | out: |
e2e004ac RL |
1938 | unregister_netdev(info->netdev); |
1939 | xennet_free_netdev(info->netdev); | |
0d160211 JF |
1940 | return err; |
1941 | } | |
1942 | ||
0d160211 JF |
1943 | static int xennet_connect(struct net_device *dev) |
1944 | { | |
1945 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 | 1946 | unsigned int num_queues = 0; |
a5b5dc3c | 1947 | int err; |
2688fcb7 AB |
1948 | unsigned int j = 0; |
1949 | struct netfront_queue *queue = NULL; | |
0d160211 | 1950 | |
2890ea5c | 1951 | if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { |
0d160211 | 1952 | dev_info(&dev->dev, |
898eb71c | 1953 | "backend does not support copying receive path\n"); |
0d160211 JF |
1954 | return -ENODEV; |
1955 | } | |
1956 | ||
f502bf2b | 1957 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
1958 | if (err) |
1959 | return err; | |
1960 | ||
2688fcb7 AB |
1961 | /* talk_to_netback() sets the correct number of queues */ |
1962 | num_queues = dev->real_num_tx_queues; | |
1963 | ||
1ba37c51 | 1964 | rtnl_lock(); |
fb507934 | 1965 | netdev_update_features(dev); |
1ba37c51 | 1966 | rtnl_unlock(); |
0d160211 | 1967 | |
0d160211 | 1968 | /* |
a5b5dc3c | 1969 | * All public and private state should now be sane. Get |
0d160211 JF |
1970 | * ready to start sending and receiving packets and give the driver |
1971 | * domain a kick because we've probably just requeued some | |
1972 | * packets. | |
1973 | */ | |
1974 | netif_carrier_on(np->netdev); | |
2688fcb7 AB |
1975 | for (j = 0; j < num_queues; ++j) { |
1976 | queue = &np->queues[j]; | |
f50b4076 | 1977 | |
2688fcb7 AB |
1978 | notify_remote_via_irq(queue->tx_irq); |
1979 | if (queue->tx_irq != queue->rx_irq) | |
1980 | notify_remote_via_irq(queue->rx_irq); | |
2688fcb7 | 1981 | |
f50b4076 DV |
1982 | spin_lock_irq(&queue->tx_lock); |
1983 | xennet_tx_buf_gc(queue); | |
2688fcb7 | 1984 | spin_unlock_irq(&queue->tx_lock); |
f50b4076 DV |
1985 | |
1986 | spin_lock_bh(&queue->rx_lock); | |
1987 | xennet_alloc_rx_buffers(queue); | |
2688fcb7 AB |
1988 | spin_unlock_bh(&queue->rx_lock); |
1989 | } | |
0d160211 JF |
1990 | |
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | /** | |
1995 | * Callback received when the backend's state changes. | |
1996 | */ | |
f502bf2b | 1997 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
1998 | enum xenbus_state backend_state) |
1999 | { | |
1b713e00 | 2000 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2001 | struct net_device *netdev = np->netdev; |
2002 | ||
2003 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
2004 | ||
2005 | switch (backend_state) { | |
2006 | case XenbusStateInitialising: | |
2007 | case XenbusStateInitialised: | |
b78c9512 NI |
2008 | case XenbusStateReconfiguring: |
2009 | case XenbusStateReconfigured: | |
0d160211 | 2010 | case XenbusStateUnknown: |
0d160211 JF |
2011 | break; |
2012 | ||
2013 | case XenbusStateInitWait: | |
2014 | if (dev->state != XenbusStateInitialising) | |
2015 | break; | |
2016 | if (xennet_connect(netdev) != 0) | |
2017 | break; | |
2018 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
2019 | break; |
2020 | ||
2021 | case XenbusStateConnected: | |
ee89bab1 | 2022 | netdev_notify_peers(netdev); |
0d160211 JF |
2023 | break; |
2024 | ||
bce3ea81 DV |
2025 | case XenbusStateClosed: |
2026 | if (dev->state == XenbusStateClosed) | |
2027 | break; | |
2028 | /* Missed the backend's CLOSING state -- fallthrough */ | |
0d160211 JF |
2029 | case XenbusStateClosing: |
2030 | xenbus_frontend_closed(dev); | |
2031 | break; | |
2032 | } | |
2033 | } | |
2034 | ||
e0ce4af9 IC |
2035 | static const struct xennet_stat { |
2036 | char name[ETH_GSTRING_LEN]; | |
2037 | u16 offset; | |
2038 | } xennet_stats[] = { | |
2039 | { | |
2040 | "rx_gso_checksum_fixup", | |
2041 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
2042 | }, | |
2043 | }; | |
2044 | ||
2045 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
2046 | { | |
2047 | switch (string_set) { | |
2048 | case ETH_SS_STATS: | |
2049 | return ARRAY_SIZE(xennet_stats); | |
2050 | default: | |
2051 | return -EINVAL; | |
2052 | } | |
2053 | } | |
2054 | ||
2055 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
2056 | struct ethtool_stats *stats, u64 * data) | |
2057 | { | |
2058 | void *np = netdev_priv(dev); | |
2059 | int i; | |
2060 | ||
2061 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
2688fcb7 | 2062 | data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); |
e0ce4af9 IC |
2063 | } |
2064 | ||
2065 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
2066 | { | |
2067 | int i; | |
2068 | ||
2069 | switch (stringset) { | |
2070 | case ETH_SS_STATS: | |
2071 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
2072 | memcpy(data + i * ETH_GSTRING_LEN, | |
2073 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
2074 | break; | |
2075 | } | |
2076 | } | |
2077 | ||
0fc0b732 | 2078 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 2079 | { |
0d160211 | 2080 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
2081 | |
2082 | .get_sset_count = xennet_get_sset_count, | |
2083 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
2084 | .get_strings = xennet_get_strings, | |
0d160211 JF |
2085 | }; |
2086 | ||
2087 | #ifdef CONFIG_SYSFS | |
1f3c2eba DV |
2088 | static ssize_t show_rxbuf(struct device *dev, |
2089 | struct device_attribute *attr, char *buf) | |
0d160211 | 2090 | { |
1f3c2eba | 2091 | return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); |
0d160211 JF |
2092 | } |
2093 | ||
1f3c2eba DV |
2094 | static ssize_t store_rxbuf(struct device *dev, |
2095 | struct device_attribute *attr, | |
2096 | const char *buf, size_t len) | |
0d160211 | 2097 | { |
0d160211 JF |
2098 | char *endp; |
2099 | unsigned long target; | |
2100 | ||
2101 | if (!capable(CAP_NET_ADMIN)) | |
2102 | return -EPERM; | |
2103 | ||
2104 | target = simple_strtoul(buf, &endp, 0); | |
2105 | if (endp == buf) | |
2106 | return -EBADMSG; | |
2107 | ||
1f3c2eba | 2108 | /* rxbuf_min and rxbuf_max are no longer configurable. */ |
0d160211 | 2109 | |
0d160211 JF |
2110 | return len; |
2111 | } | |
2112 | ||
27b917e5 TI |
2113 | static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); |
2114 | static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); | |
2115 | static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL); | |
0d160211 | 2116 | |
27b917e5 TI |
2117 | static struct attribute *xennet_dev_attrs[] = { |
2118 | &dev_attr_rxbuf_min.attr, | |
2119 | &dev_attr_rxbuf_max.attr, | |
2120 | &dev_attr_rxbuf_cur.attr, | |
2121 | NULL | |
2122 | }; | |
0d160211 | 2123 | |
27b917e5 TI |
2124 | static const struct attribute_group xennet_dev_group = { |
2125 | .attrs = xennet_dev_attrs | |
2126 | }; | |
0d160211 JF |
2127 | #endif /* CONFIG_SYSFS */ |
2128 | ||
8e0e46bb | 2129 | static int xennet_remove(struct xenbus_device *dev) |
0d160211 | 2130 | { |
1b713e00 | 2131 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2132 | |
2133 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
2134 | ||
0d160211 JF |
2135 | xennet_disconnect_backend(info); |
2136 | ||
6bc96d04 IC |
2137 | unregister_netdev(info->netdev); |
2138 | ||
9a873c71 CW |
2139 | if (info->queues) |
2140 | xennet_destroy_queues(info); | |
900e1833 | 2141 | xennet_free_netdev(info->netdev); |
0d160211 JF |
2142 | |
2143 | return 0; | |
2144 | } | |
2145 | ||
95afae48 DV |
2146 | static const struct xenbus_device_id netfront_ids[] = { |
2147 | { "vif" }, | |
2148 | { "" } | |
2149 | }; | |
2150 | ||
2151 | static struct xenbus_driver netfront_driver = { | |
2152 | .ids = netfront_ids, | |
0d160211 | 2153 | .probe = netfront_probe, |
8e0e46bb | 2154 | .remove = xennet_remove, |
0d160211 | 2155 | .resume = netfront_resume, |
f502bf2b | 2156 | .otherend_changed = netback_changed, |
95afae48 | 2157 | }; |
0d160211 JF |
2158 | |
2159 | static int __init netif_init(void) | |
2160 | { | |
6e833587 | 2161 | if (!xen_domain()) |
0d160211 JF |
2162 | return -ENODEV; |
2163 | ||
51c71a3b | 2164 | if (!xen_has_pv_nic_devices()) |
b9136d20 IM |
2165 | return -ENODEV; |
2166 | ||
383eda32 | 2167 | pr_info("Initialising Xen virtual ethernet driver\n"); |
0d160211 | 2168 | |
32a84405 WL |
2169 | /* Allow as many queues as there are CPUs if user has not |
2170 | * specified a value. | |
2171 | */ | |
2172 | if (xennet_max_queues == 0) | |
2173 | xennet_max_queues = num_online_cpus(); | |
50ee6061 | 2174 | |
ffb78a26 | 2175 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
2176 | } |
2177 | module_init(netif_init); | |
2178 | ||
2179 | ||
2180 | static void __exit netif_exit(void) | |
2181 | { | |
ffb78a26 | 2182 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2183 | } |
2184 | module_exit(netif_exit); | |
2185 | ||
2186 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2187 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2188 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2189 | MODULE_ALIAS("xennet"); |