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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 | 46 | #include <net/ip.h> |
6c5aa6fc DK |
47 | #include <linux/bpf.h> |
48 | #include <net/page_pool.h> | |
49 | #include <linux/bpf_trace.h> | |
0d160211 | 50 | |
1ccbf534 | 51 | #include <xen/xen.h> |
0d160211 JF |
52 | #include <xen/xenbus.h> |
53 | #include <xen/events.h> | |
54 | #include <xen/page.h> | |
b9136d20 | 55 | #include <xen/platform_pci.h> |
0d160211 JF |
56 | #include <xen/grant_table.h> |
57 | ||
58 | #include <xen/interface/io/netif.h> | |
59 | #include <xen/interface/memory.h> | |
60 | #include <xen/interface/grant_table.h> | |
61 | ||
50ee6061 | 62 | /* Module parameters */ |
034702a6 | 63 | #define MAX_QUEUES_DEFAULT 8 |
50ee6061 AB |
64 | static unsigned int xennet_max_queues; |
65 | module_param_named(max_queues, xennet_max_queues, uint, 0644); | |
66 | MODULE_PARM_DESC(max_queues, | |
67 | "Maximum number of queues per virtual interface"); | |
68 | ||
c2c63310 AR |
69 | #define XENNET_TIMEOUT (5 * HZ) |
70 | ||
0fc0b732 | 71 | static const struct ethtool_ops xennet_ethtool_ops; |
0d160211 JF |
72 | |
73 | struct netfront_cb { | |
3683243b | 74 | int pull_to; |
0d160211 JF |
75 | }; |
76 | ||
77 | #define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) | |
78 | ||
79 | #define RX_COPY_THRESHOLD 256 | |
80 | ||
81 | #define GRANT_INVALID_REF 0 | |
82 | ||
30c5d7f0 JG |
83 | #define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) |
84 | #define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) | |
1f3c2eba DV |
85 | |
86 | /* Minimum number of Rx slots (includes slot for GSO metadata). */ | |
87 | #define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) | |
0d160211 | 88 | |
2688fcb7 AB |
89 | /* Queue name is interface name with "-qNNN" appended */ |
90 | #define QUEUE_NAME_SIZE (IFNAMSIZ + 6) | |
91 | ||
92 | /* IRQ name is queue name with "-tx" or "-rx" appended */ | |
93 | #define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) | |
94 | ||
8edfe2e9 | 95 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
5b5971df | 96 | |
e00f85be | 97 | struct netfront_stats { |
900e1833 DV |
98 | u64 packets; |
99 | u64 bytes; | |
e00f85be | 100 | struct u64_stats_sync syncp; |
101 | }; | |
102 | ||
2688fcb7 AB |
103 | struct netfront_info; |
104 | ||
105 | struct netfront_queue { | |
106 | unsigned int id; /* Queue ID, 0-based */ | |
107 | char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ | |
108 | struct netfront_info *info; | |
0d160211 | 109 | |
6c5aa6fc DK |
110 | struct bpf_prog __rcu *xdp_prog; |
111 | ||
bea3348e | 112 | struct napi_struct napi; |
0d160211 | 113 | |
d634bf2c WL |
114 | /* Split event channels support, tx_* == rx_* when using |
115 | * single event channel. | |
116 | */ | |
117 | unsigned int tx_evtchn, rx_evtchn; | |
118 | unsigned int tx_irq, rx_irq; | |
119 | /* Only used when split event channels support is enabled */ | |
2688fcb7 AB |
120 | char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ |
121 | char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ | |
0d160211 | 122 | |
84284d3c JF |
123 | spinlock_t tx_lock; |
124 | struct xen_netif_tx_front_ring tx; | |
125 | int tx_ring_ref; | |
0d160211 JF |
126 | |
127 | /* | |
128 | * {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries | |
21631d2d | 129 | * are linked from tx_skb_freelist through tx_link. |
0d160211 | 130 | */ |
21631d2d JG |
131 | struct sk_buff *tx_skbs[NET_TX_RING_SIZE]; |
132 | unsigned short tx_link[NET_TX_RING_SIZE]; | |
133 | #define TX_LINK_NONE 0xffff | |
a884daa6 | 134 | #define TX_PENDING 0xfffe |
0d160211 JF |
135 | grant_ref_t gref_tx_head; |
136 | grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; | |
cefe0078 | 137 | struct page *grant_tx_page[NET_TX_RING_SIZE]; |
0d160211 | 138 | unsigned tx_skb_freelist; |
a884daa6 | 139 | unsigned int tx_pend_queue; |
0d160211 | 140 | |
84284d3c JF |
141 | spinlock_t rx_lock ____cacheline_aligned_in_smp; |
142 | struct xen_netif_rx_front_ring rx; | |
143 | int rx_ring_ref; | |
144 | ||
84284d3c JF |
145 | struct timer_list rx_refill_timer; |
146 | ||
0d160211 JF |
147 | struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
148 | grant_ref_t gref_rx_head; | |
149 | grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; | |
6c5aa6fc DK |
150 | |
151 | struct page_pool *page_pool; | |
152 | struct xdp_rxq_info xdp_rxq; | |
2688fcb7 AB |
153 | }; |
154 | ||
155 | struct netfront_info { | |
156 | struct list_head list; | |
157 | struct net_device *netdev; | |
158 | ||
159 | struct xenbus_device *xbdev; | |
160 | ||
161 | /* Multi-queue support */ | |
162 | struct netfront_queue *queues; | |
e0ce4af9 IC |
163 | |
164 | /* Statistics */ | |
900e1833 DV |
165 | struct netfront_stats __percpu *rx_stats; |
166 | struct netfront_stats __percpu *tx_stats; | |
e00f85be | 167 | |
6c5aa6fc DK |
168 | /* XDP state */ |
169 | bool netback_has_xdp_headroom; | |
170 | bool netfront_xdp_enabled; | |
171 | ||
a884daa6 JG |
172 | /* Is device behaving sane? */ |
173 | bool broken; | |
174 | ||
2688fcb7 | 175 | atomic_t rx_gso_checksum_fixup; |
0d160211 JF |
176 | }; |
177 | ||
178 | struct netfront_rx_info { | |
179 | struct xen_netif_rx_response rx; | |
180 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; | |
181 | }; | |
182 | ||
183 | /* | |
184 | * Access macros for acquiring freeing slots in tx_skbs[]. | |
185 | */ | |
186 | ||
21631d2d JG |
187 | static void add_id_to_list(unsigned *head, unsigned short *list, |
188 | unsigned short id) | |
0d160211 | 189 | { |
21631d2d | 190 | list[id] = *head; |
0d160211 JF |
191 | *head = id; |
192 | } | |
193 | ||
21631d2d | 194 | static unsigned short get_id_from_list(unsigned *head, unsigned short *list) |
0d160211 JF |
195 | { |
196 | unsigned int id = *head; | |
21631d2d JG |
197 | |
198 | if (id != TX_LINK_NONE) { | |
199 | *head = list[id]; | |
200 | list[id] = TX_LINK_NONE; | |
201 | } | |
0d160211 JF |
202 | return id; |
203 | } | |
204 | ||
205 | static int xennet_rxidx(RING_IDX idx) | |
206 | { | |
207 | return idx & (NET_RX_RING_SIZE - 1); | |
208 | } | |
209 | ||
2688fcb7 | 210 | static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, |
0d160211 JF |
211 | RING_IDX ri) |
212 | { | |
213 | int i = xennet_rxidx(ri); | |
2688fcb7 AB |
214 | struct sk_buff *skb = queue->rx_skbs[i]; |
215 | queue->rx_skbs[i] = NULL; | |
0d160211 JF |
216 | return skb; |
217 | } | |
218 | ||
2688fcb7 | 219 | static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, |
0d160211 JF |
220 | RING_IDX ri) |
221 | { | |
222 | int i = xennet_rxidx(ri); | |
2688fcb7 AB |
223 | grant_ref_t ref = queue->grant_rx_ref[i]; |
224 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; | |
0d160211 JF |
225 | return ref; |
226 | } | |
227 | ||
228 | #ifdef CONFIG_SYSFS | |
27b917e5 | 229 | static const struct attribute_group xennet_dev_group; |
0d160211 JF |
230 | #endif |
231 | ||
3ad9b358 | 232 | static bool xennet_can_sg(struct net_device *dev) |
0d160211 | 233 | { |
3ad9b358 | 234 | return dev->features & NETIF_F_SG; |
0d160211 JF |
235 | } |
236 | ||
237 | ||
e99e88a9 | 238 | static void rx_refill_timeout(struct timer_list *t) |
0d160211 | 239 | { |
e99e88a9 | 240 | struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); |
2688fcb7 | 241 | napi_schedule(&queue->napi); |
0d160211 JF |
242 | } |
243 | ||
2688fcb7 | 244 | static int netfront_tx_slot_available(struct netfront_queue *queue) |
0d160211 | 245 | { |
2688fcb7 | 246 | return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < |
57f230ab | 247 | (NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); |
0d160211 JF |
248 | } |
249 | ||
2688fcb7 | 250 | static void xennet_maybe_wake_tx(struct netfront_queue *queue) |
0d160211 | 251 | { |
2688fcb7 AB |
252 | struct net_device *dev = queue->info->netdev; |
253 | struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); | |
0d160211 | 254 | |
2688fcb7 AB |
255 | if (unlikely(netif_tx_queue_stopped(dev_queue)) && |
256 | netfront_tx_slot_available(queue) && | |
0d160211 | 257 | likely(netif_running(dev))) |
2688fcb7 | 258 | netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); |
0d160211 JF |
259 | } |
260 | ||
1f3c2eba DV |
261 | |
262 | static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) | |
0d160211 | 263 | { |
0d160211 JF |
264 | struct sk_buff *skb; |
265 | struct page *page; | |
0d160211 | 266 | |
1f3c2eba DV |
267 | skb = __netdev_alloc_skb(queue->info->netdev, |
268 | RX_COPY_THRESHOLD + NET_IP_ALIGN, | |
269 | GFP_ATOMIC | __GFP_NOWARN); | |
270 | if (unlikely(!skb)) | |
271 | return NULL; | |
0d160211 | 272 | |
6c5aa6fc DK |
273 | page = page_pool_dev_alloc_pages(queue->page_pool); |
274 | if (unlikely(!page)) { | |
1f3c2eba DV |
275 | kfree_skb(skb); |
276 | return NULL; | |
0d160211 | 277 | } |
1f3c2eba DV |
278 | skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
279 | ||
280 | /* Align ip header to a 16 bytes boundary */ | |
281 | skb_reserve(skb, NET_IP_ALIGN); | |
282 | skb->dev = queue->info->netdev; | |
283 | ||
284 | return skb; | |
285 | } | |
0d160211 | 286 | |
1f3c2eba DV |
287 | |
288 | static void xennet_alloc_rx_buffers(struct netfront_queue *queue) | |
289 | { | |
290 | RING_IDX req_prod = queue->rx.req_prod_pvt; | |
291 | int notify; | |
538d9291 | 292 | int err = 0; |
1f3c2eba DV |
293 | |
294 | if (unlikely(!netif_carrier_ok(queue->info->netdev))) | |
0d160211 | 295 | return; |
0d160211 | 296 | |
1f3c2eba DV |
297 | for (req_prod = queue->rx.req_prod_pvt; |
298 | req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; | |
299 | req_prod++) { | |
300 | struct sk_buff *skb; | |
301 | unsigned short id; | |
302 | grant_ref_t ref; | |
30c5d7f0 | 303 | struct page *page; |
1f3c2eba | 304 | struct xen_netif_rx_request *req; |
0d160211 | 305 | |
1f3c2eba | 306 | skb = xennet_alloc_one_rx_buffer(queue); |
538d9291 VRP |
307 | if (!skb) { |
308 | err = -ENOMEM; | |
0d160211 | 309 | break; |
538d9291 | 310 | } |
0d160211 | 311 | |
1f3c2eba | 312 | id = xennet_rxidx(req_prod); |
0d160211 | 313 | |
2688fcb7 AB |
314 | BUG_ON(queue->rx_skbs[id]); |
315 | queue->rx_skbs[id] = skb; | |
0d160211 | 316 | |
2688fcb7 | 317 | ref = gnttab_claim_grant_reference(&queue->gref_rx_head); |
269ebce4 | 318 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
2688fcb7 | 319 | queue->grant_rx_ref[id] = ref; |
0d160211 | 320 | |
30c5d7f0 | 321 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
0d160211 | 322 | |
1f3c2eba | 323 | req = RING_GET_REQUEST(&queue->rx, req_prod); |
30c5d7f0 JG |
324 | gnttab_page_grant_foreign_access_ref_one(ref, |
325 | queue->info->xbdev->otherend_id, | |
326 | page, | |
327 | 0); | |
0d160211 JF |
328 | req->id = id; |
329 | req->gref = ref; | |
330 | } | |
331 | ||
1f3c2eba DV |
332 | queue->rx.req_prod_pvt = req_prod; |
333 | ||
538d9291 VRP |
334 | /* Try again later if there are not enough requests or skb allocation |
335 | * failed. | |
336 | * Enough requests is quantified as the sum of newly created slots and | |
337 | * the unconsumed slots at the backend. | |
338 | */ | |
339 | if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || | |
340 | unlikely(err)) { | |
1f3c2eba DV |
341 | mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); |
342 | return; | |
343 | } | |
344 | ||
2688fcb7 | 345 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); |
0d160211 | 346 | if (notify) |
2688fcb7 | 347 | notify_remote_via_irq(queue->rx_irq); |
0d160211 JF |
348 | } |
349 | ||
350 | static int xennet_open(struct net_device *dev) | |
351 | { | |
352 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 AB |
353 | unsigned int num_queues = dev->real_num_tx_queues; |
354 | unsigned int i = 0; | |
355 | struct netfront_queue *queue = NULL; | |
356 | ||
a884daa6 | 357 | if (!np->queues || np->broken) |
f599c64f RL |
358 | return -ENODEV; |
359 | ||
2688fcb7 AB |
360 | for (i = 0; i < num_queues; ++i) { |
361 | queue = &np->queues[i]; | |
362 | napi_enable(&queue->napi); | |
363 | ||
364 | spin_lock_bh(&queue->rx_lock); | |
365 | if (netif_carrier_ok(dev)) { | |
366 | xennet_alloc_rx_buffers(queue); | |
367 | queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; | |
368 | if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) | |
369 | napi_schedule(&queue->napi); | |
370 | } | |
371 | spin_unlock_bh(&queue->rx_lock); | |
0d160211 | 372 | } |
0d160211 | 373 | |
2688fcb7 | 374 | netif_tx_start_all_queues(dev); |
0d160211 JF |
375 | |
376 | return 0; | |
377 | } | |
378 | ||
2688fcb7 | 379 | static void xennet_tx_buf_gc(struct netfront_queue *queue) |
0d160211 JF |
380 | { |
381 | RING_IDX cons, prod; | |
382 | unsigned short id; | |
0d160211 | 383 | struct sk_buff *skb; |
7d0105b5 | 384 | bool more_to_do; |
a884daa6 | 385 | const struct device *dev = &queue->info->netdev->dev; |
0d160211 | 386 | |
2688fcb7 | 387 | BUG_ON(!netif_carrier_ok(queue->info->netdev)); |
0d160211 JF |
388 | |
389 | do { | |
2688fcb7 | 390 | prod = queue->tx.sring->rsp_prod; |
a884daa6 JG |
391 | if (RING_RESPONSE_PROD_OVERFLOW(&queue->tx, prod)) { |
392 | dev_alert(dev, "Illegal number of responses %u\n", | |
393 | prod - queue->tx.rsp_cons); | |
394 | goto err; | |
395 | } | |
0d160211 JF |
396 | rmb(); /* Ensure we see responses up to 'rp'. */ |
397 | ||
2688fcb7 | 398 | for (cons = queue->tx.rsp_cons; cons != prod; cons++) { |
8446066b | 399 | struct xen_netif_tx_response txrsp; |
0d160211 | 400 | |
8446066b JG |
401 | RING_COPY_RESPONSE(&queue->tx, cons, &txrsp); |
402 | if (txrsp.status == XEN_NETIF_RSP_NULL) | |
0d160211 JF |
403 | continue; |
404 | ||
a884daa6 JG |
405 | id = txrsp.id; |
406 | if (id >= RING_SIZE(&queue->tx)) { | |
407 | dev_alert(dev, | |
408 | "Response has incorrect id (%u)\n", | |
409 | id); | |
410 | goto err; | |
411 | } | |
412 | if (queue->tx_link[id] != TX_PENDING) { | |
413 | dev_alert(dev, | |
414 | "Response for inactive request\n"); | |
415 | goto err; | |
416 | } | |
417 | ||
418 | queue->tx_link[id] = TX_LINK_NONE; | |
21631d2d JG |
419 | skb = queue->tx_skbs[id]; |
420 | queue->tx_skbs[id] = NULL; | |
0d160211 | 421 | if (unlikely(gnttab_query_foreign_access( |
2688fcb7 | 422 | queue->grant_tx_ref[id]) != 0)) { |
a884daa6 JG |
423 | dev_alert(dev, |
424 | "Grant still in use by backend domain\n"); | |
425 | goto err; | |
0d160211 JF |
426 | } |
427 | gnttab_end_foreign_access_ref( | |
2688fcb7 | 428 | queue->grant_tx_ref[id], GNTMAP_readonly); |
0d160211 | 429 | gnttab_release_grant_reference( |
2688fcb7 AB |
430 | &queue->gref_tx_head, queue->grant_tx_ref[id]); |
431 | queue->grant_tx_ref[id] = GRANT_INVALID_REF; | |
432 | queue->grant_tx_page[id] = NULL; | |
21631d2d | 433 | add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, id); |
0d160211 JF |
434 | dev_kfree_skb_irq(skb); |
435 | } | |
436 | ||
2688fcb7 | 437 | queue->tx.rsp_cons = prod; |
0d160211 | 438 | |
7d0105b5 MC |
439 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); |
440 | } while (more_to_do); | |
0d160211 | 441 | |
2688fcb7 | 442 | xennet_maybe_wake_tx(queue); |
a884daa6 JG |
443 | |
444 | return; | |
445 | ||
446 | err: | |
447 | queue->info->broken = true; | |
448 | dev_alert(dev, "Disabled for further use\n"); | |
0d160211 JF |
449 | } |
450 | ||
30c5d7f0 JG |
451 | struct xennet_gnttab_make_txreq { |
452 | struct netfront_queue *queue; | |
453 | struct sk_buff *skb; | |
454 | struct page *page; | |
162081ec JG |
455 | struct xen_netif_tx_request *tx; /* Last request on ring page */ |
456 | struct xen_netif_tx_request tx_local; /* Last request local copy*/ | |
30c5d7f0 JG |
457 | unsigned int size; |
458 | }; | |
459 | ||
460 | static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, | |
461 | unsigned int len, void *data) | |
0d160211 | 462 | { |
30c5d7f0 | 463 | struct xennet_gnttab_make_txreq *info = data; |
0d160211 | 464 | unsigned int id; |
a55e8bb8 | 465 | struct xen_netif_tx_request *tx; |
0d160211 | 466 | grant_ref_t ref; |
30c5d7f0 JG |
467 | /* convenient aliases */ |
468 | struct page *page = info->page; | |
469 | struct netfront_queue *queue = info->queue; | |
470 | struct sk_buff *skb = info->skb; | |
0d160211 | 471 | |
21631d2d | 472 | id = get_id_from_list(&queue->tx_skb_freelist, queue->tx_link); |
a55e8bb8 DV |
473 | tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
474 | ref = gnttab_claim_grant_reference(&queue->gref_tx_head); | |
269ebce4 | 475 | WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
0d160211 | 476 | |
30c5d7f0 JG |
477 | gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, |
478 | gfn, GNTMAP_readonly); | |
0d160211 | 479 | |
21631d2d | 480 | queue->tx_skbs[id] = skb; |
a55e8bb8 DV |
481 | queue->grant_tx_page[id] = page; |
482 | queue->grant_tx_ref[id] = ref; | |
0d160211 | 483 | |
162081ec JG |
484 | info->tx_local.id = id; |
485 | info->tx_local.gref = ref; | |
486 | info->tx_local.offset = offset; | |
487 | info->tx_local.size = len; | |
488 | info->tx_local.flags = 0; | |
489 | ||
490 | *tx = info->tx_local; | |
0d160211 | 491 | |
a884daa6 JG |
492 | /* |
493 | * Put the request in the pending queue, it will be set to be pending | |
494 | * when the producer index is about to be raised. | |
495 | */ | |
496 | add_id_to_list(&queue->tx_pend_queue, queue->tx_link, id); | |
497 | ||
30c5d7f0 | 498 | info->tx = tx; |
162081ec | 499 | info->size += info->tx_local.size; |
30c5d7f0 JG |
500 | } |
501 | ||
502 | static struct xen_netif_tx_request *xennet_make_first_txreq( | |
162081ec JG |
503 | struct xennet_gnttab_make_txreq *info, |
504 | unsigned int offset, unsigned int len) | |
30c5d7f0 | 505 | { |
162081ec | 506 | info->size = 0; |
30c5d7f0 | 507 | |
162081ec | 508 | gnttab_for_one_grant(info->page, offset, len, xennet_tx_setup_grant, info); |
30c5d7f0 | 509 | |
162081ec | 510 | return info->tx; |
30c5d7f0 JG |
511 | } |
512 | ||
513 | static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, | |
514 | unsigned int len, void *data) | |
515 | { | |
516 | struct xennet_gnttab_make_txreq *info = data; | |
517 | ||
518 | info->tx->flags |= XEN_NETTXF_more_data; | |
519 | skb_get(info->skb); | |
520 | xennet_tx_setup_grant(gfn, offset, len, data); | |
a55e8bb8 | 521 | } |
0d160211 | 522 | |
162081ec JG |
523 | static void xennet_make_txreqs( |
524 | struct xennet_gnttab_make_txreq *info, | |
525 | struct page *page, | |
a55e8bb8 DV |
526 | unsigned int offset, unsigned int len) |
527 | { | |
528 | /* Skip unused frames from start of page */ | |
529 | page += offset >> PAGE_SHIFT; | |
530 | offset &= ~PAGE_MASK; | |
0d160211 | 531 | |
a55e8bb8 | 532 | while (len) { |
162081ec JG |
533 | info->page = page; |
534 | info->size = 0; | |
30c5d7f0 JG |
535 | |
536 | gnttab_foreach_grant_in_range(page, offset, len, | |
537 | xennet_make_one_txreq, | |
162081ec | 538 | info); |
30c5d7f0 | 539 | |
a55e8bb8 DV |
540 | page++; |
541 | offset = 0; | |
162081ec | 542 | len -= info->size; |
0d160211 | 543 | } |
0d160211 JF |
544 | } |
545 | ||
f36c3747 | 546 | /* |
e84448d5 DV |
547 | * Count how many ring slots are required to send this skb. Each frag |
548 | * might be a compound page. | |
f36c3747 | 549 | */ |
e84448d5 | 550 | static int xennet_count_skb_slots(struct sk_buff *skb) |
f36c3747 IC |
551 | { |
552 | int i, frags = skb_shinfo(skb)->nr_frags; | |
30c5d7f0 | 553 | int slots; |
e84448d5 | 554 | |
30c5d7f0 JG |
555 | slots = gnttab_count_grant(offset_in_page(skb->data), |
556 | skb_headlen(skb)); | |
f36c3747 IC |
557 | |
558 | for (i = 0; i < frags; i++) { | |
559 | skb_frag_t *frag = skb_shinfo(skb)->frags + i; | |
560 | unsigned long size = skb_frag_size(frag); | |
b54c9d5b | 561 | unsigned long offset = skb_frag_off(frag); |
f36c3747 IC |
562 | |
563 | /* Skip unused frames from start of page */ | |
564 | offset &= ~PAGE_MASK; | |
565 | ||
30c5d7f0 | 566 | slots += gnttab_count_grant(offset, size); |
f36c3747 IC |
567 | } |
568 | ||
30c5d7f0 | 569 | return slots; |
f36c3747 IC |
570 | } |
571 | ||
50ee6061 | 572 | static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, |
a350ecce | 573 | struct net_device *sb_dev) |
2688fcb7 | 574 | { |
50ee6061 AB |
575 | unsigned int num_queues = dev->real_num_tx_queues; |
576 | u32 hash; | |
577 | u16 queue_idx; | |
578 | ||
579 | /* First, check if there is only one queue */ | |
580 | if (num_queues == 1) { | |
581 | queue_idx = 0; | |
582 | } else { | |
583 | hash = skb_get_hash(skb); | |
584 | queue_idx = hash % num_queues; | |
585 | } | |
586 | ||
587 | return queue_idx; | |
2688fcb7 AB |
588 | } |
589 | ||
a884daa6 JG |
590 | static void xennet_mark_tx_pending(struct netfront_queue *queue) |
591 | { | |
592 | unsigned int i; | |
593 | ||
594 | while ((i = get_id_from_list(&queue->tx_pend_queue, queue->tx_link)) != | |
595 | TX_LINK_NONE) | |
596 | queue->tx_link[i] = TX_PENDING; | |
597 | } | |
598 | ||
6c5aa6fc DK |
599 | static int xennet_xdp_xmit_one(struct net_device *dev, |
600 | struct netfront_queue *queue, | |
601 | struct xdp_frame *xdpf) | |
602 | { | |
603 | struct netfront_info *np = netdev_priv(dev); | |
604 | struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); | |
162081ec JG |
605 | struct xennet_gnttab_make_txreq info = { |
606 | .queue = queue, | |
607 | .skb = NULL, | |
608 | .page = virt_to_page(xdpf->data), | |
609 | }; | |
6c5aa6fc DK |
610 | int notify; |
611 | ||
162081ec | 612 | xennet_make_first_txreq(&info, |
6c5aa6fc DK |
613 | offset_in_page(xdpf->data), |
614 | xdpf->len); | |
615 | ||
a884daa6 JG |
616 | xennet_mark_tx_pending(queue); |
617 | ||
6c5aa6fc DK |
618 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
619 | if (notify) | |
620 | notify_remote_via_irq(queue->tx_irq); | |
621 | ||
622 | u64_stats_update_begin(&tx_stats->syncp); | |
623 | tx_stats->bytes += xdpf->len; | |
624 | tx_stats->packets++; | |
625 | u64_stats_update_end(&tx_stats->syncp); | |
626 | ||
627 | xennet_tx_buf_gc(queue); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | static int xennet_xdp_xmit(struct net_device *dev, int n, | |
633 | struct xdp_frame **frames, u32 flags) | |
634 | { | |
635 | unsigned int num_queues = dev->real_num_tx_queues; | |
636 | struct netfront_info *np = netdev_priv(dev); | |
637 | struct netfront_queue *queue = NULL; | |
638 | unsigned long irq_flags; | |
fdc13979 LB |
639 | int nxmit = 0; |
640 | int i; | |
6c5aa6fc | 641 | |
a884daa6 JG |
642 | if (unlikely(np->broken)) |
643 | return -ENODEV; | |
6c5aa6fc DK |
644 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
645 | return -EINVAL; | |
646 | ||
647 | queue = &np->queues[smp_processor_id() % num_queues]; | |
648 | ||
649 | spin_lock_irqsave(&queue->tx_lock, irq_flags); | |
650 | for (i = 0; i < n; i++) { | |
651 | struct xdp_frame *xdpf = frames[i]; | |
652 | ||
653 | if (!xdpf) | |
654 | continue; | |
fdc13979 LB |
655 | if (xennet_xdp_xmit_one(dev, queue, xdpf)) |
656 | break; | |
657 | nxmit++; | |
6c5aa6fc DK |
658 | } |
659 | spin_unlock_irqrestore(&queue->tx_lock, irq_flags); | |
660 | ||
fdc13979 | 661 | return nxmit; |
6c5aa6fc DK |
662 | } |
663 | ||
664 | ||
30c5d7f0 JG |
665 | #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
666 | ||
24a94b3c | 667 | static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
0d160211 | 668 | { |
0d160211 | 669 | struct netfront_info *np = netdev_priv(dev); |
900e1833 | 670 | struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
162081ec | 671 | struct xen_netif_tx_request *first_tx; |
a55e8bb8 | 672 | unsigned int i; |
0d160211 | 673 | int notify; |
f36c3747 | 674 | int slots; |
a55e8bb8 DV |
675 | struct page *page; |
676 | unsigned int offset; | |
677 | unsigned int len; | |
cf66f9d4 | 678 | unsigned long flags; |
2688fcb7 | 679 | struct netfront_queue *queue = NULL; |
162081ec | 680 | struct xennet_gnttab_make_txreq info = { }; |
2688fcb7 AB |
681 | unsigned int num_queues = dev->real_num_tx_queues; |
682 | u16 queue_index; | |
fd07160b | 683 | struct sk_buff *nskb; |
2688fcb7 AB |
684 | |
685 | /* Drop the packet if no queues are set up */ | |
686 | if (num_queues < 1) | |
687 | goto drop; | |
a884daa6 JG |
688 | if (unlikely(np->broken)) |
689 | goto drop; | |
2688fcb7 AB |
690 | /* Determine which queue to transmit this SKB on */ |
691 | queue_index = skb_get_queue_mapping(skb); | |
692 | queue = &np->queues[queue_index]; | |
0d160211 | 693 | |
9ecd1a75 WL |
694 | /* If skb->len is too big for wire format, drop skb and alert |
695 | * user about misconfiguration. | |
696 | */ | |
697 | if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { | |
698 | net_alert_ratelimited( | |
699 | "xennet: skb->len = %u, too big for wire format\n", | |
700 | skb->len); | |
701 | goto drop; | |
702 | } | |
703 | ||
e84448d5 | 704 | slots = xennet_count_skb_slots(skb); |
30c5d7f0 | 705 | if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { |
97a6d1bb ZK |
706 | net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", |
707 | slots, skb->len); | |
708 | if (skb_linearize(skb)) | |
709 | goto drop; | |
0d160211 JF |
710 | } |
711 | ||
a55e8bb8 DV |
712 | page = virt_to_page(skb->data); |
713 | offset = offset_in_page(skb->data); | |
fd07160b VK |
714 | |
715 | /* The first req should be at least ETH_HLEN size or the packet will be | |
716 | * dropped by netback. | |
717 | */ | |
718 | if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { | |
719 | nskb = skb_copy(skb, GFP_ATOMIC); | |
720 | if (!nskb) | |
721 | goto drop; | |
62f3250f | 722 | dev_consume_skb_any(skb); |
fd07160b VK |
723 | skb = nskb; |
724 | page = virt_to_page(skb->data); | |
725 | offset = offset_in_page(skb->data); | |
726 | } | |
727 | ||
a55e8bb8 DV |
728 | len = skb_headlen(skb); |
729 | ||
2688fcb7 | 730 | spin_lock_irqsave(&queue->tx_lock, flags); |
0d160211 JF |
731 | |
732 | if (unlikely(!netif_carrier_ok(dev) || | |
f36c3747 | 733 | (slots > 1 && !xennet_can_sg(dev)) || |
8b86a61d | 734 | netif_needs_gso(skb, netif_skb_features(skb)))) { |
2688fcb7 | 735 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
0d160211 JF |
736 | goto drop; |
737 | } | |
738 | ||
a55e8bb8 | 739 | /* First request for the linear area. */ |
162081ec JG |
740 | info.queue = queue; |
741 | info.skb = skb; | |
742 | info.page = page; | |
743 | first_tx = xennet_make_first_txreq(&info, offset, len); | |
744 | offset += info.tx_local.size; | |
30c5d7f0 JG |
745 | if (offset == PAGE_SIZE) { |
746 | page++; | |
747 | offset = 0; | |
748 | } | |
162081ec | 749 | len -= info.tx_local.size; |
0d160211 | 750 | |
0d160211 JF |
751 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
752 | /* local packet? */ | |
162081ec JG |
753 | first_tx->flags |= XEN_NETTXF_csum_blank | |
754 | XEN_NETTXF_data_validated; | |
0d160211 JF |
755 | else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
756 | /* remote but checksummed. */ | |
162081ec | 757 | first_tx->flags |= XEN_NETTXF_data_validated; |
0d160211 | 758 | |
a55e8bb8 | 759 | /* Optional extra info after the first request. */ |
0d160211 JF |
760 | if (skb_shinfo(skb)->gso_size) { |
761 | struct xen_netif_extra_info *gso; | |
762 | ||
763 | gso = (struct xen_netif_extra_info *) | |
a55e8bb8 | 764 | RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
0d160211 | 765 | |
162081ec | 766 | first_tx->flags |= XEN_NETTXF_extra_info; |
0d160211 JF |
767 | |
768 | gso->u.gso.size = skb_shinfo(skb)->gso_size; | |
2c0057de PD |
769 | gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
770 | XEN_NETIF_GSO_TYPE_TCPV6 : | |
771 | XEN_NETIF_GSO_TYPE_TCPV4; | |
0d160211 JF |
772 | gso->u.gso.pad = 0; |
773 | gso->u.gso.features = 0; | |
774 | ||
775 | gso->type = XEN_NETIF_EXTRA_TYPE_GSO; | |
776 | gso->flags = 0; | |
0d160211 JF |
777 | } |
778 | ||
a55e8bb8 | 779 | /* Requests for the rest of the linear area. */ |
162081ec | 780 | xennet_make_txreqs(&info, page, offset, len); |
a55e8bb8 DV |
781 | |
782 | /* Requests for all the frags. */ | |
783 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
784 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
162081ec | 785 | xennet_make_txreqs(&info, skb_frag_page(frag), |
b54c9d5b | 786 | skb_frag_off(frag), |
a55e8bb8 DV |
787 | skb_frag_size(frag)); |
788 | } | |
0d160211 | 789 | |
a55e8bb8 DV |
790 | /* First request has the packet length. */ |
791 | first_tx->size = skb->len; | |
0d160211 | 792 | |
91ffb9d3 DD |
793 | /* timestamp packet in software */ |
794 | skb_tx_timestamp(skb); | |
795 | ||
a884daa6 JG |
796 | xennet_mark_tx_pending(queue); |
797 | ||
2688fcb7 | 798 | RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
0d160211 | 799 | if (notify) |
2688fcb7 | 800 | notify_remote_via_irq(queue->tx_irq); |
0d160211 | 801 | |
900e1833 DV |
802 | u64_stats_update_begin(&tx_stats->syncp); |
803 | tx_stats->bytes += skb->len; | |
804 | tx_stats->packets++; | |
805 | u64_stats_update_end(&tx_stats->syncp); | |
10a273a6 JF |
806 | |
807 | /* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ | |
2688fcb7 | 808 | xennet_tx_buf_gc(queue); |
0d160211 | 809 | |
2688fcb7 AB |
810 | if (!netfront_tx_slot_available(queue)) |
811 | netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); | |
0d160211 | 812 | |
2688fcb7 | 813 | spin_unlock_irqrestore(&queue->tx_lock, flags); |
0d160211 | 814 | |
6ed10654 | 815 | return NETDEV_TX_OK; |
0d160211 JF |
816 | |
817 | drop: | |
09f75cd7 | 818 | dev->stats.tx_dropped++; |
979de8a0 | 819 | dev_kfree_skb_any(skb); |
6ed10654 | 820 | return NETDEV_TX_OK; |
0d160211 JF |
821 | } |
822 | ||
823 | static int xennet_close(struct net_device *dev) | |
824 | { | |
825 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 AB |
826 | unsigned int num_queues = dev->real_num_tx_queues; |
827 | unsigned int i; | |
828 | struct netfront_queue *queue; | |
829 | netif_tx_stop_all_queues(np->netdev); | |
830 | for (i = 0; i < num_queues; ++i) { | |
831 | queue = &np->queues[i]; | |
832 | napi_disable(&queue->napi); | |
833 | } | |
0d160211 JF |
834 | return 0; |
835 | } | |
836 | ||
2688fcb7 | 837 | static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, |
0d160211 JF |
838 | grant_ref_t ref) |
839 | { | |
2688fcb7 AB |
840 | int new = xennet_rxidx(queue->rx.req_prod_pvt); |
841 | ||
842 | BUG_ON(queue->rx_skbs[new]); | |
843 | queue->rx_skbs[new] = skb; | |
844 | queue->grant_rx_ref[new] = ref; | |
845 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; | |
846 | RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; | |
847 | queue->rx.req_prod_pvt++; | |
0d160211 JF |
848 | } |
849 | ||
2688fcb7 | 850 | static int xennet_get_extras(struct netfront_queue *queue, |
0d160211 JF |
851 | struct xen_netif_extra_info *extras, |
852 | RING_IDX rp) | |
853 | ||
854 | { | |
8446066b | 855 | struct xen_netif_extra_info extra; |
2688fcb7 AB |
856 | struct device *dev = &queue->info->netdev->dev; |
857 | RING_IDX cons = queue->rx.rsp_cons; | |
0d160211 JF |
858 | int err = 0; |
859 | ||
860 | do { | |
861 | struct sk_buff *skb; | |
862 | grant_ref_t ref; | |
863 | ||
864 | if (unlikely(cons + 1 == rp)) { | |
865 | if (net_ratelimit()) | |
866 | dev_warn(dev, "Missing extra info\n"); | |
867 | err = -EBADR; | |
868 | break; | |
869 | } | |
870 | ||
8446066b | 871 | RING_COPY_RESPONSE(&queue->rx, ++cons, &extra); |
0d160211 | 872 | |
8446066b JG |
873 | if (unlikely(!extra.type || |
874 | extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
0d160211 JF |
875 | if (net_ratelimit()) |
876 | dev_warn(dev, "Invalid extra type: %d\n", | |
8446066b | 877 | extra.type); |
0d160211 JF |
878 | err = -EINVAL; |
879 | } else { | |
8446066b | 880 | extras[extra.type - 1] = extra; |
0d160211 JF |
881 | } |
882 | ||
2688fcb7 AB |
883 | skb = xennet_get_rx_skb(queue, cons); |
884 | ref = xennet_get_rx_ref(queue, cons); | |
885 | xennet_move_rx_slot(queue, skb, ref); | |
8446066b | 886 | } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
0d160211 | 887 | |
2688fcb7 | 888 | queue->rx.rsp_cons = cons; |
0d160211 JF |
889 | return err; |
890 | } | |
891 | ||
6c5aa6fc DK |
892 | static u32 xennet_run_xdp(struct netfront_queue *queue, struct page *pdata, |
893 | struct xen_netif_rx_response *rx, struct bpf_prog *prog, | |
894 | struct xdp_buff *xdp, bool *need_xdp_flush) | |
895 | { | |
896 | struct xdp_frame *xdpf; | |
897 | u32 len = rx->status; | |
e44f65fd | 898 | u32 act; |
6c5aa6fc DK |
899 | int err; |
900 | ||
43b5169d LB |
901 | xdp_init_buff(xdp, XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, |
902 | &queue->xdp_rxq); | |
be9df4af LB |
903 | xdp_prepare_buff(xdp, page_address(pdata), XDP_PACKET_HEADROOM, |
904 | len, false); | |
6c5aa6fc DK |
905 | |
906 | act = bpf_prog_run_xdp(prog, xdp); | |
907 | switch (act) { | |
908 | case XDP_TX: | |
909 | get_page(pdata); | |
910 | xdpf = xdp_convert_buff_to_frame(xdp); | |
911 | err = xennet_xdp_xmit(queue->info->netdev, 1, &xdpf, 0); | |
fdc13979 LB |
912 | if (unlikely(!err)) |
913 | xdp_return_frame_rx_napi(xdpf); | |
914 | else if (unlikely(err < 0)) | |
6c5aa6fc DK |
915 | trace_xdp_exception(queue->info->netdev, prog, act); |
916 | break; | |
917 | case XDP_REDIRECT: | |
918 | get_page(pdata); | |
919 | err = xdp_do_redirect(queue->info->netdev, xdp, prog); | |
920 | *need_xdp_flush = true; | |
921 | if (unlikely(err)) | |
922 | trace_xdp_exception(queue->info->netdev, prog, act); | |
923 | break; | |
924 | case XDP_PASS: | |
925 | case XDP_DROP: | |
926 | break; | |
927 | ||
928 | case XDP_ABORTED: | |
929 | trace_xdp_exception(queue->info->netdev, prog, act); | |
930 | break; | |
931 | ||
932 | default: | |
933 | bpf_warn_invalid_xdp_action(act); | |
934 | } | |
935 | ||
936 | return act; | |
937 | } | |
938 | ||
2688fcb7 | 939 | static int xennet_get_responses(struct netfront_queue *queue, |
0d160211 | 940 | struct netfront_rx_info *rinfo, RING_IDX rp, |
6c5aa6fc DK |
941 | struct sk_buff_head *list, |
942 | bool *need_xdp_flush) | |
0d160211 | 943 | { |
8446066b | 944 | struct xen_netif_rx_response *rx = &rinfo->rx, rx_local; |
6c5aa6fc | 945 | int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); |
2688fcb7 AB |
946 | RING_IDX cons = queue->rx.rsp_cons; |
947 | struct sk_buff *skb = xennet_get_rx_skb(queue, cons); | |
6c5aa6fc | 948 | struct xen_netif_extra_info *extras = rinfo->extras; |
2688fcb7 | 949 | grant_ref_t ref = xennet_get_rx_ref(queue, cons); |
6c5aa6fc DK |
950 | struct device *dev = &queue->info->netdev->dev; |
951 | struct bpf_prog *xdp_prog; | |
952 | struct xdp_buff xdp; | |
953 | unsigned long ret; | |
7158ff6d | 954 | int slots = 1; |
0d160211 | 955 | int err = 0; |
6c5aa6fc | 956 | u32 verdict; |
0d160211 | 957 | |
f942dc25 | 958 | if (rx->flags & XEN_NETRXF_extra_info) { |
2688fcb7 | 959 | err = xennet_get_extras(queue, extras, rp); |
6c5aa6fc DK |
960 | if (!err) { |
961 | if (extras[XEN_NETIF_EXTRA_TYPE_XDP - 1].type) { | |
962 | struct xen_netif_extra_info *xdp; | |
963 | ||
964 | xdp = &extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; | |
965 | rx->offset = xdp->u.xdp.headroom; | |
966 | } | |
967 | } | |
2688fcb7 | 968 | cons = queue->rx.rsp_cons; |
0d160211 JF |
969 | } |
970 | ||
971 | for (;;) { | |
972 | if (unlikely(rx->status < 0 || | |
30c5d7f0 | 973 | rx->offset + rx->status > XEN_PAGE_SIZE)) { |
0d160211 | 974 | if (net_ratelimit()) |
6c10127d | 975 | dev_warn(dev, "rx->offset: %u, size: %d\n", |
0d160211 | 976 | rx->offset, rx->status); |
2688fcb7 | 977 | xennet_move_rx_slot(queue, skb, ref); |
0d160211 JF |
978 | err = -EINVAL; |
979 | goto next; | |
980 | } | |
981 | ||
982 | /* | |
983 | * This definitely indicates a bug, either in this driver or in | |
984 | * the backend driver. In future this should flag the bad | |
697089dc | 985 | * situation to the system controller to reboot the backend. |
0d160211 JF |
986 | */ |
987 | if (ref == GRANT_INVALID_REF) { | |
988 | if (net_ratelimit()) | |
989 | dev_warn(dev, "Bad rx response id %d.\n", | |
990 | rx->id); | |
991 | err = -EINVAL; | |
992 | goto next; | |
993 | } | |
994 | ||
995 | ret = gnttab_end_foreign_access_ref(ref, 0); | |
996 | BUG_ON(!ret); | |
997 | ||
2688fcb7 | 998 | gnttab_release_grant_reference(&queue->gref_rx_head, ref); |
0d160211 | 999 | |
6c5aa6fc DK |
1000 | rcu_read_lock(); |
1001 | xdp_prog = rcu_dereference(queue->xdp_prog); | |
1002 | if (xdp_prog) { | |
1003 | if (!(rx->flags & XEN_NETRXF_more_data)) { | |
1004 | /* currently only a single page contains data */ | |
1005 | verdict = xennet_run_xdp(queue, | |
1006 | skb_frag_page(&skb_shinfo(skb)->frags[0]), | |
1007 | rx, xdp_prog, &xdp, need_xdp_flush); | |
1008 | if (verdict != XDP_PASS) | |
1009 | err = -EINVAL; | |
1010 | } else { | |
1011 | /* drop the frame */ | |
1012 | err = -EINVAL; | |
1013 | } | |
1014 | } | |
1015 | rcu_read_unlock(); | |
0d160211 | 1016 | next: |
6c5aa6fc | 1017 | __skb_queue_tail(list, skb); |
f942dc25 | 1018 | if (!(rx->flags & XEN_NETRXF_more_data)) |
0d160211 JF |
1019 | break; |
1020 | ||
7158ff6d | 1021 | if (cons + slots == rp) { |
0d160211 | 1022 | if (net_ratelimit()) |
7158ff6d | 1023 | dev_warn(dev, "Need more slots\n"); |
0d160211 JF |
1024 | err = -ENOENT; |
1025 | break; | |
1026 | } | |
1027 | ||
8446066b JG |
1028 | RING_COPY_RESPONSE(&queue->rx, cons + slots, &rx_local); |
1029 | rx = &rx_local; | |
2688fcb7 AB |
1030 | skb = xennet_get_rx_skb(queue, cons + slots); |
1031 | ref = xennet_get_rx_ref(queue, cons + slots); | |
7158ff6d | 1032 | slots++; |
0d160211 JF |
1033 | } |
1034 | ||
7158ff6d | 1035 | if (unlikely(slots > max)) { |
0d160211 | 1036 | if (net_ratelimit()) |
697089dc | 1037 | dev_warn(dev, "Too many slots\n"); |
0d160211 JF |
1038 | err = -E2BIG; |
1039 | } | |
1040 | ||
1041 | if (unlikely(err)) | |
2688fcb7 | 1042 | queue->rx.rsp_cons = cons + slots; |
0d160211 JF |
1043 | |
1044 | return err; | |
1045 | } | |
1046 | ||
1047 | static int xennet_set_skb_gso(struct sk_buff *skb, | |
1048 | struct xen_netif_extra_info *gso) | |
1049 | { | |
1050 | if (!gso->u.gso.size) { | |
1051 | if (net_ratelimit()) | |
383eda32 | 1052 | pr_warn("GSO size must not be zero\n"); |
0d160211 JF |
1053 | return -EINVAL; |
1054 | } | |
1055 | ||
2c0057de PD |
1056 | if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
1057 | gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { | |
0d160211 | 1058 | if (net_ratelimit()) |
383eda32 | 1059 | pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
0d160211 JF |
1060 | return -EINVAL; |
1061 | } | |
1062 | ||
1063 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
2c0057de PD |
1064 | skb_shinfo(skb)->gso_type = |
1065 | (gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? | |
1066 | SKB_GSO_TCPV4 : | |
1067 | SKB_GSO_TCPV6; | |
0d160211 JF |
1068 | |
1069 | /* Header must be checked, and gso_segs computed. */ | |
1070 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1071 | skb_shinfo(skb)->gso_segs = 0; | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
a761129e DZ |
1076 | static int xennet_fill_frags(struct netfront_queue *queue, |
1077 | struct sk_buff *skb, | |
1078 | struct sk_buff_head *list) | |
0d160211 | 1079 | { |
2688fcb7 | 1080 | RING_IDX cons = queue->rx.rsp_cons; |
0d160211 JF |
1081 | struct sk_buff *nskb; |
1082 | ||
1083 | while ((nskb = __skb_dequeue(list))) { | |
8446066b | 1084 | struct xen_netif_rx_response rx; |
01c68026 | 1085 | skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
0d160211 | 1086 | |
8446066b JG |
1087 | RING_COPY_RESPONSE(&queue->rx, ++cons, &rx); |
1088 | ||
d472b3a6 | 1089 | if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { |
093b9c71 | 1090 | unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 1091 | |
d81c5054 | 1092 | BUG_ON(pull_to < skb_headlen(skb)); |
093b9c71 JB |
1093 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
1094 | } | |
ad4f15dc | 1095 | if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { |
00b36850 | 1096 | queue->rx.rsp_cons = ++cons + skb_queue_len(list); |
ad4f15dc | 1097 | kfree_skb(nskb); |
a761129e | 1098 | return -ENOENT; |
ad4f15dc | 1099 | } |
093b9c71 | 1100 | |
d472b3a6 JG |
1101 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
1102 | skb_frag_page(nfrag), | |
8446066b | 1103 | rx.offset, rx.status, PAGE_SIZE); |
0d160211 JF |
1104 | |
1105 | skb_shinfo(nskb)->nr_frags = 0; | |
1106 | kfree_skb(nskb); | |
0d160211 JF |
1107 | } |
1108 | ||
a761129e DZ |
1109 | queue->rx.rsp_cons = cons; |
1110 | ||
1111 | return 0; | |
0d160211 JF |
1112 | } |
1113 | ||
e0ce4af9 | 1114 | static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
0d160211 | 1115 | { |
b5cf66cd | 1116 | bool recalculate_partial_csum = false; |
e0ce4af9 IC |
1117 | |
1118 | /* | |
1119 | * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
1120 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
1121 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
1122 | * recalculate the partial checksum. | |
1123 | */ | |
1124 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
1125 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 | 1126 | atomic_inc(&np->rx_gso_checksum_fixup); |
e0ce4af9 | 1127 | skb->ip_summed = CHECKSUM_PARTIAL; |
b5cf66cd | 1128 | recalculate_partial_csum = true; |
e0ce4af9 IC |
1129 | } |
1130 | ||
1131 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
1132 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
1133 | return 0; | |
0d160211 | 1134 | |
b5cf66cd | 1135 | return skb_checksum_setup(skb, recalculate_partial_csum); |
0d160211 JF |
1136 | } |
1137 | ||
2688fcb7 | 1138 | static int handle_incoming_queue(struct netfront_queue *queue, |
09f75cd7 | 1139 | struct sk_buff_head *rxq) |
0d160211 | 1140 | { |
900e1833 | 1141 | struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); |
0d160211 JF |
1142 | int packets_dropped = 0; |
1143 | struct sk_buff *skb; | |
1144 | ||
1145 | while ((skb = __skb_dequeue(rxq)) != NULL) { | |
3683243b | 1146 | int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
0d160211 | 1147 | |
093b9c71 JB |
1148 | if (pull_to > skb_headlen(skb)) |
1149 | __pskb_pull_tail(skb, pull_to - skb_headlen(skb)); | |
0d160211 JF |
1150 | |
1151 | /* Ethernet work: Delayed to here as it peeks the header. */ | |
2688fcb7 | 1152 | skb->protocol = eth_type_trans(skb, queue->info->netdev); |
d554f73d | 1153 | skb_reset_network_header(skb); |
0d160211 | 1154 | |
2688fcb7 | 1155 | if (checksum_setup(queue->info->netdev, skb)) { |
e0ce4af9 IC |
1156 | kfree_skb(skb); |
1157 | packets_dropped++; | |
2688fcb7 | 1158 | queue->info->netdev->stats.rx_errors++; |
e0ce4af9 | 1159 | continue; |
0d160211 JF |
1160 | } |
1161 | ||
900e1833 DV |
1162 | u64_stats_update_begin(&rx_stats->syncp); |
1163 | rx_stats->packets++; | |
1164 | rx_stats->bytes += skb->len; | |
1165 | u64_stats_update_end(&rx_stats->syncp); | |
0d160211 JF |
1166 | |
1167 | /* Pass it up. */ | |
2688fcb7 | 1168 | napi_gro_receive(&queue->napi, skb); |
0d160211 JF |
1169 | } |
1170 | ||
1171 | return packets_dropped; | |
1172 | } | |
1173 | ||
bea3348e | 1174 | static int xennet_poll(struct napi_struct *napi, int budget) |
0d160211 | 1175 | { |
2688fcb7 AB |
1176 | struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); |
1177 | struct net_device *dev = queue->info->netdev; | |
0d160211 JF |
1178 | struct sk_buff *skb; |
1179 | struct netfront_rx_info rinfo; | |
1180 | struct xen_netif_rx_response *rx = &rinfo.rx; | |
1181 | struct xen_netif_extra_info *extras = rinfo.extras; | |
1182 | RING_IDX i, rp; | |
bea3348e | 1183 | int work_done; |
0d160211 JF |
1184 | struct sk_buff_head rxq; |
1185 | struct sk_buff_head errq; | |
1186 | struct sk_buff_head tmpq; | |
0d160211 | 1187 | int err; |
6c5aa6fc | 1188 | bool need_xdp_flush = false; |
0d160211 | 1189 | |
2688fcb7 | 1190 | spin_lock(&queue->rx_lock); |
0d160211 | 1191 | |
0d160211 JF |
1192 | skb_queue_head_init(&rxq); |
1193 | skb_queue_head_init(&errq); | |
1194 | skb_queue_head_init(&tmpq); | |
1195 | ||
2688fcb7 | 1196 | rp = queue->rx.sring->rsp_prod; |
a884daa6 JG |
1197 | if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) { |
1198 | dev_alert(&dev->dev, "Illegal number of responses %u\n", | |
1199 | rp - queue->rx.rsp_cons); | |
1200 | queue->info->broken = true; | |
1201 | spin_unlock(&queue->rx_lock); | |
1202 | return 0; | |
1203 | } | |
0d160211 JF |
1204 | rmb(); /* Ensure we see queued responses up to 'rp'. */ |
1205 | ||
2688fcb7 | 1206 | i = queue->rx.rsp_cons; |
0d160211 JF |
1207 | work_done = 0; |
1208 | while ((i != rp) && (work_done < budget)) { | |
8446066b | 1209 | RING_COPY_RESPONSE(&queue->rx, i, rx); |
0d160211 JF |
1210 | memset(extras, 0, sizeof(rinfo.extras)); |
1211 | ||
6c5aa6fc DK |
1212 | err = xennet_get_responses(queue, &rinfo, rp, &tmpq, |
1213 | &need_xdp_flush); | |
0d160211 JF |
1214 | |
1215 | if (unlikely(err)) { | |
1216 | err: | |
1217 | while ((skb = __skb_dequeue(&tmpq))) | |
1218 | __skb_queue_tail(&errq, skb); | |
09f75cd7 | 1219 | dev->stats.rx_errors++; |
2688fcb7 | 1220 | i = queue->rx.rsp_cons; |
0d160211 JF |
1221 | continue; |
1222 | } | |
1223 | ||
1224 | skb = __skb_dequeue(&tmpq); | |
1225 | ||
1226 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { | |
1227 | struct xen_netif_extra_info *gso; | |
1228 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1229 | ||
1230 | if (unlikely(xennet_set_skb_gso(skb, gso))) { | |
1231 | __skb_queue_head(&tmpq, skb); | |
2688fcb7 | 1232 | queue->rx.rsp_cons += skb_queue_len(&tmpq); |
0d160211 JF |
1233 | goto err; |
1234 | } | |
1235 | } | |
1236 | ||
3683243b IC |
1237 | NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
1238 | if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) | |
1239 | NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; | |
0d160211 | 1240 | |
b54c9d5b | 1241 | skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); |
3683243b IC |
1242 | skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); |
1243 | skb->data_len = rx->status; | |
093b9c71 | 1244 | skb->len += rx->status; |
0d160211 | 1245 | |
a761129e | 1246 | if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) |
ad4f15dc | 1247 | goto err; |
0d160211 | 1248 | |
f942dc25 | 1249 | if (rx->flags & XEN_NETRXF_csum_blank) |
0d160211 | 1250 | skb->ip_summed = CHECKSUM_PARTIAL; |
f942dc25 | 1251 | else if (rx->flags & XEN_NETRXF_data_validated) |
0d160211 JF |
1252 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1253 | ||
1254 | __skb_queue_tail(&rxq, skb); | |
1255 | ||
a761129e | 1256 | i = ++queue->rx.rsp_cons; |
0d160211 JF |
1257 | work_done++; |
1258 | } | |
6c5aa6fc DK |
1259 | if (need_xdp_flush) |
1260 | xdp_do_flush(); | |
0d160211 | 1261 | |
56cfe5d0 | 1262 | __skb_queue_purge(&errq); |
0d160211 | 1263 | |
2688fcb7 | 1264 | work_done -= handle_incoming_queue(queue, &rxq); |
0d160211 | 1265 | |
2688fcb7 | 1266 | xennet_alloc_rx_buffers(queue); |
0d160211 | 1267 | |
0d160211 | 1268 | if (work_done < budget) { |
bea3348e SH |
1269 | int more_to_do = 0; |
1270 | ||
6ad20165 | 1271 | napi_complete_done(napi, work_done); |
0d160211 | 1272 | |
2688fcb7 | 1273 | RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); |
6a6dc08f DV |
1274 | if (more_to_do) |
1275 | napi_schedule(napi); | |
0d160211 JF |
1276 | } |
1277 | ||
2688fcb7 | 1278 | spin_unlock(&queue->rx_lock); |
0d160211 | 1279 | |
bea3348e | 1280 | return work_done; |
0d160211 JF |
1281 | } |
1282 | ||
1283 | static int xennet_change_mtu(struct net_device *dev, int mtu) | |
1284 | { | |
0c36820e | 1285 | int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; |
0d160211 JF |
1286 | |
1287 | if (mtu > max) | |
1288 | return -EINVAL; | |
1289 | dev->mtu = mtu; | |
1290 | return 0; | |
1291 | } | |
1292 | ||
bc1f4470 | 1293 | static void xennet_get_stats64(struct net_device *dev, |
1294 | struct rtnl_link_stats64 *tot) | |
e00f85be | 1295 | { |
1296 | struct netfront_info *np = netdev_priv(dev); | |
1297 | int cpu; | |
1298 | ||
1299 | for_each_possible_cpu(cpu) { | |
900e1833 DV |
1300 | struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); |
1301 | struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); | |
e00f85be | 1302 | u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
1303 | unsigned int start; | |
1304 | ||
1305 | do { | |
900e1833 DV |
1306 | start = u64_stats_fetch_begin_irq(&tx_stats->syncp); |
1307 | tx_packets = tx_stats->packets; | |
1308 | tx_bytes = tx_stats->bytes; | |
1309 | } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); | |
e00f85be | 1310 | |
900e1833 DV |
1311 | do { |
1312 | start = u64_stats_fetch_begin_irq(&rx_stats->syncp); | |
1313 | rx_packets = rx_stats->packets; | |
1314 | rx_bytes = rx_stats->bytes; | |
1315 | } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); | |
e00f85be | 1316 | |
1317 | tot->rx_packets += rx_packets; | |
1318 | tot->tx_packets += tx_packets; | |
1319 | tot->rx_bytes += rx_bytes; | |
1320 | tot->tx_bytes += tx_bytes; | |
1321 | } | |
1322 | ||
1323 | tot->rx_errors = dev->stats.rx_errors; | |
1324 | tot->tx_dropped = dev->stats.tx_dropped; | |
e00f85be | 1325 | } |
1326 | ||
2688fcb7 | 1327 | static void xennet_release_tx_bufs(struct netfront_queue *queue) |
0d160211 JF |
1328 | { |
1329 | struct sk_buff *skb; | |
1330 | int i; | |
1331 | ||
1332 | for (i = 0; i < NET_TX_RING_SIZE; i++) { | |
1333 | /* Skip over entries which are actually freelist references */ | |
21631d2d | 1334 | if (!queue->tx_skbs[i]) |
0d160211 JF |
1335 | continue; |
1336 | ||
21631d2d JG |
1337 | skb = queue->tx_skbs[i]; |
1338 | queue->tx_skbs[i] = NULL; | |
2688fcb7 AB |
1339 | get_page(queue->grant_tx_page[i]); |
1340 | gnttab_end_foreign_access(queue->grant_tx_ref[i], | |
cefe0078 | 1341 | GNTMAP_readonly, |
2688fcb7 AB |
1342 | (unsigned long)page_address(queue->grant_tx_page[i])); |
1343 | queue->grant_tx_page[i] = NULL; | |
1344 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; | |
21631d2d | 1345 | add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, i); |
0d160211 JF |
1346 | dev_kfree_skb_irq(skb); |
1347 | } | |
1348 | } | |
1349 | ||
2688fcb7 | 1350 | static void xennet_release_rx_bufs(struct netfront_queue *queue) |
0d160211 | 1351 | { |
0d160211 JF |
1352 | int id, ref; |
1353 | ||
2688fcb7 | 1354 | spin_lock_bh(&queue->rx_lock); |
0d160211 JF |
1355 | |
1356 | for (id = 0; id < NET_RX_RING_SIZE; id++) { | |
cefe0078 AL |
1357 | struct sk_buff *skb; |
1358 | struct page *page; | |
0d160211 | 1359 | |
2688fcb7 | 1360 | skb = queue->rx_skbs[id]; |
cefe0078 | 1361 | if (!skb) |
0d160211 | 1362 | continue; |
0d160211 | 1363 | |
2688fcb7 | 1364 | ref = queue->grant_rx_ref[id]; |
cefe0078 AL |
1365 | if (ref == GRANT_INVALID_REF) |
1366 | continue; | |
0d160211 | 1367 | |
cefe0078 | 1368 | page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
0d160211 | 1369 | |
cefe0078 AL |
1370 | /* gnttab_end_foreign_access() needs a page ref until |
1371 | * foreign access is ended (which may be deferred). | |
1372 | */ | |
1373 | get_page(page); | |
1374 | gnttab_end_foreign_access(ref, 0, | |
1375 | (unsigned long)page_address(page)); | |
2688fcb7 | 1376 | queue->grant_rx_ref[id] = GRANT_INVALID_REF; |
0d160211 | 1377 | |
cefe0078 | 1378 | kfree_skb(skb); |
0d160211 JF |
1379 | } |
1380 | ||
2688fcb7 | 1381 | spin_unlock_bh(&queue->rx_lock); |
0d160211 JF |
1382 | } |
1383 | ||
c8f44aff MM |
1384 | static netdev_features_t xennet_fix_features(struct net_device *dev, |
1385 | netdev_features_t features) | |
8f7b01a1 ED |
1386 | { |
1387 | struct netfront_info *np = netdev_priv(dev); | |
8f7b01a1 | 1388 | |
2890ea5c JG |
1389 | if (features & NETIF_F_SG && |
1390 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) | |
1391 | features &= ~NETIF_F_SG; | |
8f7b01a1 | 1392 | |
2890ea5c JG |
1393 | if (features & NETIF_F_IPV6_CSUM && |
1394 | !xenbus_read_unsigned(np->xbdev->otherend, | |
1395 | "feature-ipv6-csum-offload", 0)) | |
1396 | features &= ~NETIF_F_IPV6_CSUM; | |
8f7b01a1 | 1397 | |
2890ea5c JG |
1398 | if (features & NETIF_F_TSO && |
1399 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) | |
1400 | features &= ~NETIF_F_TSO; | |
8f7b01a1 | 1401 | |
2890ea5c JG |
1402 | if (features & NETIF_F_TSO6 && |
1403 | !xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) | |
1404 | features &= ~NETIF_F_TSO6; | |
2c0057de | 1405 | |
8f7b01a1 ED |
1406 | return features; |
1407 | } | |
1408 | ||
c8f44aff MM |
1409 | static int xennet_set_features(struct net_device *dev, |
1410 | netdev_features_t features) | |
8f7b01a1 ED |
1411 | { |
1412 | if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { | |
1413 | netdev_info(dev, "Reducing MTU because no SG offload"); | |
1414 | dev->mtu = ETH_DATA_LEN; | |
1415 | } | |
1416 | ||
1417 | return 0; | |
1418 | } | |
1419 | ||
d634bf2c | 1420 | static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
cf66f9d4 | 1421 | { |
2688fcb7 | 1422 | struct netfront_queue *queue = dev_id; |
cf66f9d4 KRW |
1423 | unsigned long flags; |
1424 | ||
a884daa6 JG |
1425 | if (queue->info->broken) |
1426 | return IRQ_HANDLED; | |
1427 | ||
2688fcb7 AB |
1428 | spin_lock_irqsave(&queue->tx_lock, flags); |
1429 | xennet_tx_buf_gc(queue); | |
1430 | spin_unlock_irqrestore(&queue->tx_lock, flags); | |
cf66f9d4 | 1431 | |
d634bf2c WL |
1432 | return IRQ_HANDLED; |
1433 | } | |
1434 | ||
1435 | static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) | |
1436 | { | |
2688fcb7 AB |
1437 | struct netfront_queue *queue = dev_id; |
1438 | struct net_device *dev = queue->info->netdev; | |
d634bf2c | 1439 | |
a884daa6 JG |
1440 | if (queue->info->broken) |
1441 | return IRQ_HANDLED; | |
1442 | ||
d634bf2c | 1443 | if (likely(netif_carrier_ok(dev) && |
2688fcb7 | 1444 | RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) |
76541869 | 1445 | napi_schedule(&queue->napi); |
cf66f9d4 | 1446 | |
d634bf2c WL |
1447 | return IRQ_HANDLED; |
1448 | } | |
cf66f9d4 | 1449 | |
d634bf2c WL |
1450 | static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
1451 | { | |
1452 | xennet_tx_interrupt(irq, dev_id); | |
1453 | xennet_rx_interrupt(irq, dev_id); | |
cf66f9d4 KRW |
1454 | return IRQ_HANDLED; |
1455 | } | |
1456 | ||
1457 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
1458 | static void xennet_poll_controller(struct net_device *dev) | |
1459 | { | |
2688fcb7 AB |
1460 | /* Poll each queue */ |
1461 | struct netfront_info *info = netdev_priv(dev); | |
1462 | unsigned int num_queues = dev->real_num_tx_queues; | |
1463 | unsigned int i; | |
a884daa6 JG |
1464 | |
1465 | if (info->broken) | |
1466 | return; | |
1467 | ||
2688fcb7 AB |
1468 | for (i = 0; i < num_queues; ++i) |
1469 | xennet_interrupt(0, &info->queues[i]); | |
cf66f9d4 KRW |
1470 | } |
1471 | #endif | |
1472 | ||
6c5aa6fc DK |
1473 | #define NETBACK_XDP_HEADROOM_DISABLE 0 |
1474 | #define NETBACK_XDP_HEADROOM_ENABLE 1 | |
1475 | ||
1476 | static int talk_to_netback_xdp(struct netfront_info *np, int xdp) | |
1477 | { | |
1478 | int err; | |
1479 | unsigned short headroom; | |
1480 | ||
1481 | headroom = xdp ? XDP_PACKET_HEADROOM : 0; | |
1482 | err = xenbus_printf(XBT_NIL, np->xbdev->nodename, | |
1483 | "xdp-headroom", "%hu", | |
1484 | headroom); | |
1485 | if (err) | |
1486 | pr_warn("Error writing xdp-headroom\n"); | |
1487 | ||
1488 | return err; | |
1489 | } | |
1490 | ||
1491 | static int xennet_xdp_set(struct net_device *dev, struct bpf_prog *prog, | |
1492 | struct netlink_ext_ack *extack) | |
1493 | { | |
1494 | unsigned long max_mtu = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; | |
1495 | struct netfront_info *np = netdev_priv(dev); | |
1496 | struct bpf_prog *old_prog; | |
1497 | unsigned int i, err; | |
1498 | ||
1499 | if (dev->mtu > max_mtu) { | |
1500 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_mtu); | |
1501 | return -EINVAL; | |
1502 | } | |
1503 | ||
1504 | if (!np->netback_has_xdp_headroom) | |
1505 | return 0; | |
1506 | ||
1507 | xenbus_switch_state(np->xbdev, XenbusStateReconfiguring); | |
1508 | ||
1509 | err = talk_to_netback_xdp(np, prog ? NETBACK_XDP_HEADROOM_ENABLE : | |
1510 | NETBACK_XDP_HEADROOM_DISABLE); | |
1511 | if (err) | |
1512 | return err; | |
1513 | ||
1514 | /* avoid the race with XDP headroom adjustment */ | |
1515 | wait_event(module_wq, | |
1516 | xenbus_read_driver_state(np->xbdev->otherend) == | |
1517 | XenbusStateReconfigured); | |
1518 | np->netfront_xdp_enabled = true; | |
1519 | ||
1520 | old_prog = rtnl_dereference(np->queues[0].xdp_prog); | |
1521 | ||
1522 | if (prog) | |
1523 | bpf_prog_add(prog, dev->real_num_tx_queues); | |
1524 | ||
1525 | for (i = 0; i < dev->real_num_tx_queues; ++i) | |
1526 | rcu_assign_pointer(np->queues[i].xdp_prog, prog); | |
1527 | ||
1528 | if (old_prog) | |
1529 | for (i = 0; i < dev->real_num_tx_queues; ++i) | |
1530 | bpf_prog_put(old_prog); | |
1531 | ||
1532 | xenbus_switch_state(np->xbdev, XenbusStateConnected); | |
1533 | ||
1534 | return 0; | |
1535 | } | |
1536 | ||
6c5aa6fc DK |
1537 | static int xennet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
1538 | { | |
a884daa6 JG |
1539 | struct netfront_info *np = netdev_priv(dev); |
1540 | ||
1541 | if (np->broken) | |
1542 | return -ENODEV; | |
1543 | ||
6c5aa6fc DK |
1544 | switch (xdp->command) { |
1545 | case XDP_SETUP_PROG: | |
1546 | return xennet_xdp_set(dev, xdp->prog, xdp->extack); | |
6c5aa6fc DK |
1547 | default: |
1548 | return -EINVAL; | |
1549 | } | |
1550 | } | |
1551 | ||
0a0b9d2e SH |
1552 | static const struct net_device_ops xennet_netdev_ops = { |
1553 | .ndo_open = xennet_open, | |
0a0b9d2e SH |
1554 | .ndo_stop = xennet_close, |
1555 | .ndo_start_xmit = xennet_start_xmit, | |
1556 | .ndo_change_mtu = xennet_change_mtu, | |
e00f85be | 1557 | .ndo_get_stats64 = xennet_get_stats64, |
0a0b9d2e SH |
1558 | .ndo_set_mac_address = eth_mac_addr, |
1559 | .ndo_validate_addr = eth_validate_addr, | |
fb507934 MM |
1560 | .ndo_fix_features = xennet_fix_features, |
1561 | .ndo_set_features = xennet_set_features, | |
2688fcb7 | 1562 | .ndo_select_queue = xennet_select_queue, |
6c5aa6fc DK |
1563 | .ndo_bpf = xennet_xdp, |
1564 | .ndo_xdp_xmit = xennet_xdp_xmit, | |
cf66f9d4 KRW |
1565 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1566 | .ndo_poll_controller = xennet_poll_controller, | |
1567 | #endif | |
0a0b9d2e SH |
1568 | }; |
1569 | ||
900e1833 DV |
1570 | static void xennet_free_netdev(struct net_device *netdev) |
1571 | { | |
1572 | struct netfront_info *np = netdev_priv(netdev); | |
1573 | ||
1574 | free_percpu(np->rx_stats); | |
1575 | free_percpu(np->tx_stats); | |
1576 | free_netdev(netdev); | |
1577 | } | |
1578 | ||
8e0e46bb | 1579 | static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
0d160211 | 1580 | { |
2688fcb7 | 1581 | int err; |
0d160211 JF |
1582 | struct net_device *netdev; |
1583 | struct netfront_info *np; | |
1584 | ||
50ee6061 | 1585 | netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); |
41de8d4c | 1586 | if (!netdev) |
0d160211 | 1587 | return ERR_PTR(-ENOMEM); |
0d160211 JF |
1588 | |
1589 | np = netdev_priv(netdev); | |
1590 | np->xbdev = dev; | |
1591 | ||
2688fcb7 | 1592 | np->queues = NULL; |
0d160211 | 1593 | |
e00f85be | 1594 | err = -ENOMEM; |
900e1833 DV |
1595 | np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
1596 | if (np->rx_stats == NULL) | |
1597 | goto exit; | |
1598 | np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); | |
1599 | if (np->tx_stats == NULL) | |
e00f85be | 1600 | goto exit; |
1601 | ||
0a0b9d2e SH |
1602 | netdev->netdev_ops = &xennet_netdev_ops; |
1603 | ||
fb507934 MM |
1604 | netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
1605 | NETIF_F_GSO_ROBUST; | |
2c0057de PD |
1606 | netdev->hw_features = NETIF_F_SG | |
1607 | NETIF_F_IPV6_CSUM | | |
1608 | NETIF_F_TSO | NETIF_F_TSO6; | |
0d160211 | 1609 | |
fc3e5941 IC |
1610 | /* |
1611 | * Assume that all hw features are available for now. This set | |
1612 | * will be adjusted by the call to netdev_update_features() in | |
1613 | * xennet_connect() which is the earliest point where we can | |
1614 | * negotiate with the backend regarding supported features. | |
1615 | */ | |
1616 | netdev->features |= netdev->hw_features; | |
1617 | ||
7ad24ea4 | 1618 | netdev->ethtool_ops = &xennet_ethtool_ops; |
e1043a4b | 1619 | netdev->min_mtu = ETH_MIN_MTU; |
d0c2c997 | 1620 | netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; |
0d160211 JF |
1621 | SET_NETDEV_DEV(netdev, &dev->dev); |
1622 | ||
1623 | np->netdev = netdev; | |
6c5aa6fc | 1624 | np->netfront_xdp_enabled = false; |
0d160211 JF |
1625 | |
1626 | netif_carrier_off(netdev); | |
1627 | ||
c2c63310 AR |
1628 | do { |
1629 | xenbus_switch_state(dev, XenbusStateInitialising); | |
1630 | err = wait_event_timeout(module_wq, | |
1631 | xenbus_read_driver_state(dev->otherend) != | |
1632 | XenbusStateClosed && | |
1633 | xenbus_read_driver_state(dev->otherend) != | |
1634 | XenbusStateUnknown, XENNET_TIMEOUT); | |
1635 | } while (!err); | |
1636 | ||
0d160211 JF |
1637 | return netdev; |
1638 | ||
0d160211 | 1639 | exit: |
900e1833 | 1640 | xennet_free_netdev(netdev); |
0d160211 JF |
1641 | return ERR_PTR(err); |
1642 | } | |
1643 | ||
80708602 | 1644 | /* |
0d160211 JF |
1645 | * Entry point to this code when a new device is created. Allocate the basic |
1646 | * structures and the ring buffers for communication with the backend, and | |
1647 | * inform the backend of the appropriate details for those. | |
1648 | */ | |
8e0e46bb | 1649 | static int netfront_probe(struct xenbus_device *dev, |
1dd06ae8 | 1650 | const struct xenbus_device_id *id) |
0d160211 JF |
1651 | { |
1652 | int err; | |
1653 | struct net_device *netdev; | |
1654 | struct netfront_info *info; | |
1655 | ||
1656 | netdev = xennet_create_dev(dev); | |
1657 | if (IS_ERR(netdev)) { | |
1658 | err = PTR_ERR(netdev); | |
1659 | xenbus_dev_fatal(dev, err, "creating netdev"); | |
1660 | return err; | |
1661 | } | |
1662 | ||
1663 | info = netdev_priv(netdev); | |
1b713e00 | 1664 | dev_set_drvdata(&dev->dev, info); |
27b917e5 TI |
1665 | #ifdef CONFIG_SYSFS |
1666 | info->netdev->sysfs_groups[0] = &xennet_dev_group; | |
1667 | #endif | |
0d160211 | 1668 | |
0d160211 | 1669 | return 0; |
0d160211 JF |
1670 | } |
1671 | ||
1672 | static void xennet_end_access(int ref, void *page) | |
1673 | { | |
1674 | /* This frees the page as a side-effect */ | |
1675 | if (ref != GRANT_INVALID_REF) | |
1676 | gnttab_end_foreign_access(ref, 0, (unsigned long)page); | |
1677 | } | |
1678 | ||
1679 | static void xennet_disconnect_backend(struct netfront_info *info) | |
1680 | { | |
2688fcb7 | 1681 | unsigned int i = 0; |
2688fcb7 AB |
1682 | unsigned int num_queues = info->netdev->real_num_tx_queues; |
1683 | ||
f9feb1e6 DV |
1684 | netif_carrier_off(info->netdev); |
1685 | ||
9a873c71 | 1686 | for (i = 0; i < num_queues && info->queues; ++i) { |
76541869 DV |
1687 | struct netfront_queue *queue = &info->queues[i]; |
1688 | ||
74470954 BO |
1689 | del_timer_sync(&queue->rx_refill_timer); |
1690 | ||
2688fcb7 AB |
1691 | if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) |
1692 | unbind_from_irqhandler(queue->tx_irq, queue); | |
1693 | if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { | |
1694 | unbind_from_irqhandler(queue->tx_irq, queue); | |
1695 | unbind_from_irqhandler(queue->rx_irq, queue); | |
1696 | } | |
1697 | queue->tx_evtchn = queue->rx_evtchn = 0; | |
1698 | queue->tx_irq = queue->rx_irq = 0; | |
0d160211 | 1699 | |
274b0455 CW |
1700 | if (netif_running(info->netdev)) |
1701 | napi_synchronize(&queue->napi); | |
f9feb1e6 | 1702 | |
a5b5dc3c DV |
1703 | xennet_release_tx_bufs(queue); |
1704 | xennet_release_rx_bufs(queue); | |
1705 | gnttab_free_grant_references(queue->gref_tx_head); | |
1706 | gnttab_free_grant_references(queue->gref_rx_head); | |
1707 | ||
2688fcb7 AB |
1708 | /* End access and free the pages */ |
1709 | xennet_end_access(queue->tx_ring_ref, queue->tx.sring); | |
1710 | xennet_end_access(queue->rx_ring_ref, queue->rx.sring); | |
0d160211 | 1711 | |
2688fcb7 AB |
1712 | queue->tx_ring_ref = GRANT_INVALID_REF; |
1713 | queue->rx_ring_ref = GRANT_INVALID_REF; | |
1714 | queue->tx.sring = NULL; | |
1715 | queue->rx.sring = NULL; | |
6c5aa6fc DK |
1716 | |
1717 | page_pool_destroy(queue->page_pool); | |
2688fcb7 | 1718 | } |
0d160211 JF |
1719 | } |
1720 | ||
80708602 | 1721 | /* |
0d160211 JF |
1722 | * We are reconnecting to the backend, due to a suspend/resume, or a backend |
1723 | * driver restart. We tear down our netif structure and recreate it, but | |
1724 | * leave the device-layer structures intact so that this is transparent to the | |
1725 | * rest of the kernel. | |
1726 | */ | |
1727 | static int netfront_resume(struct xenbus_device *dev) | |
1728 | { | |
1b713e00 | 1729 | struct netfront_info *info = dev_get_drvdata(&dev->dev); |
0d160211 JF |
1730 | |
1731 | dev_dbg(&dev->dev, "%s\n", dev->nodename); | |
1732 | ||
1733 | xennet_disconnect_backend(info); | |
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) | |
1738 | { | |
1739 | char *s, *e, *macstr; | |
1740 | int i; | |
1741 | ||
1742 | macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); | |
1743 | if (IS_ERR(macstr)) | |
1744 | return PTR_ERR(macstr); | |
1745 | ||
1746 | for (i = 0; i < ETH_ALEN; i++) { | |
1747 | mac[i] = simple_strtoul(s, &e, 16); | |
1748 | if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { | |
1749 | kfree(macstr); | |
1750 | return -ENOENT; | |
1751 | } | |
1752 | s = e+1; | |
1753 | } | |
1754 | ||
1755 | kfree(macstr); | |
1756 | return 0; | |
1757 | } | |
1758 | ||
2688fcb7 | 1759 | static int setup_netfront_single(struct netfront_queue *queue) |
d634bf2c WL |
1760 | { |
1761 | int err; | |
1762 | ||
2688fcb7 | 1763 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
d634bf2c WL |
1764 | if (err < 0) |
1765 | goto fail; | |
1766 | ||
2688fcb7 | 1767 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
d634bf2c | 1768 | xennet_interrupt, |
2688fcb7 | 1769 | 0, queue->info->netdev->name, queue); |
d634bf2c WL |
1770 | if (err < 0) |
1771 | goto bind_fail; | |
2688fcb7 AB |
1772 | queue->rx_evtchn = queue->tx_evtchn; |
1773 | queue->rx_irq = queue->tx_irq = err; | |
d634bf2c WL |
1774 | |
1775 | return 0; | |
1776 | ||
1777 | bind_fail: | |
2688fcb7 AB |
1778 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
1779 | queue->tx_evtchn = 0; | |
d634bf2c WL |
1780 | fail: |
1781 | return err; | |
1782 | } | |
1783 | ||
2688fcb7 | 1784 | static int setup_netfront_split(struct netfront_queue *queue) |
d634bf2c WL |
1785 | { |
1786 | int err; | |
1787 | ||
2688fcb7 | 1788 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
d634bf2c WL |
1789 | if (err < 0) |
1790 | goto fail; | |
2688fcb7 | 1791 | err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); |
d634bf2c WL |
1792 | if (err < 0) |
1793 | goto alloc_rx_evtchn_fail; | |
1794 | ||
2688fcb7 AB |
1795 | snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
1796 | "%s-tx", queue->name); | |
1797 | err = bind_evtchn_to_irqhandler(queue->tx_evtchn, | |
d634bf2c | 1798 | xennet_tx_interrupt, |
2688fcb7 | 1799 | 0, queue->tx_irq_name, queue); |
d634bf2c WL |
1800 | if (err < 0) |
1801 | goto bind_tx_fail; | |
2688fcb7 | 1802 | queue->tx_irq = err; |
d634bf2c | 1803 | |
2688fcb7 AB |
1804 | snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
1805 | "%s-rx", queue->name); | |
1806 | err = bind_evtchn_to_irqhandler(queue->rx_evtchn, | |
d634bf2c | 1807 | xennet_rx_interrupt, |
2688fcb7 | 1808 | 0, queue->rx_irq_name, queue); |
d634bf2c WL |
1809 | if (err < 0) |
1810 | goto bind_rx_fail; | |
2688fcb7 | 1811 | queue->rx_irq = err; |
d634bf2c WL |
1812 | |
1813 | return 0; | |
1814 | ||
1815 | bind_rx_fail: | |
2688fcb7 AB |
1816 | unbind_from_irqhandler(queue->tx_irq, queue); |
1817 | queue->tx_irq = 0; | |
d634bf2c | 1818 | bind_tx_fail: |
2688fcb7 AB |
1819 | xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); |
1820 | queue->rx_evtchn = 0; | |
d634bf2c | 1821 | alloc_rx_evtchn_fail: |
2688fcb7 AB |
1822 | xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
1823 | queue->tx_evtchn = 0; | |
d634bf2c WL |
1824 | fail: |
1825 | return err; | |
1826 | } | |
1827 | ||
2688fcb7 AB |
1828 | static int setup_netfront(struct xenbus_device *dev, |
1829 | struct netfront_queue *queue, unsigned int feature_split_evtchn) | |
0d160211 JF |
1830 | { |
1831 | struct xen_netif_tx_sring *txs; | |
1832 | struct xen_netif_rx_sring *rxs; | |
ccc9d90a | 1833 | grant_ref_t gref; |
0d160211 | 1834 | int err; |
0d160211 | 1835 | |
2688fcb7 AB |
1836 | queue->tx_ring_ref = GRANT_INVALID_REF; |
1837 | queue->rx_ring_ref = GRANT_INVALID_REF; | |
1838 | queue->rx.sring = NULL; | |
1839 | queue->tx.sring = NULL; | |
0d160211 | 1840 | |
a144ff09 | 1841 | txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1842 | if (!txs) { |
1843 | err = -ENOMEM; | |
1844 | xenbus_dev_fatal(dev, err, "allocating tx ring page"); | |
1845 | goto fail; | |
1846 | } | |
1847 | SHARED_RING_INIT(txs); | |
30c5d7f0 | 1848 | FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
0d160211 | 1849 | |
ccc9d90a | 1850 | err = xenbus_grant_ring(dev, txs, 1, &gref); |
1ca2983a WL |
1851 | if (err < 0) |
1852 | goto grant_tx_ring_fail; | |
ccc9d90a | 1853 | queue->tx_ring_ref = gref; |
0d160211 | 1854 | |
a144ff09 | 1855 | rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
0d160211 JF |
1856 | if (!rxs) { |
1857 | err = -ENOMEM; | |
1858 | xenbus_dev_fatal(dev, err, "allocating rx ring page"); | |
1ca2983a | 1859 | goto alloc_rx_ring_fail; |
0d160211 JF |
1860 | } |
1861 | SHARED_RING_INIT(rxs); | |
30c5d7f0 | 1862 | FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
0d160211 | 1863 | |
ccc9d90a | 1864 | err = xenbus_grant_ring(dev, rxs, 1, &gref); |
1ca2983a WL |
1865 | if (err < 0) |
1866 | goto grant_rx_ring_fail; | |
ccc9d90a | 1867 | queue->rx_ring_ref = gref; |
0d160211 | 1868 | |
d634bf2c | 1869 | if (feature_split_evtchn) |
2688fcb7 | 1870 | err = setup_netfront_split(queue); |
d634bf2c WL |
1871 | /* setup single event channel if |
1872 | * a) feature-split-event-channels == 0 | |
1873 | * b) feature-split-event-channels == 1 but failed to setup | |
1874 | */ | |
e93fac3b | 1875 | if (!feature_split_evtchn || err) |
2688fcb7 | 1876 | err = setup_netfront_single(queue); |
d634bf2c | 1877 | |
0d160211 | 1878 | if (err) |
1ca2983a | 1879 | goto alloc_evtchn_fail; |
0d160211 | 1880 | |
0d160211 JF |
1881 | return 0; |
1882 | ||
1ca2983a WL |
1883 | /* If we fail to setup netfront, it is safe to just revoke access to |
1884 | * granted pages because backend is not accessing it at this point. | |
1885 | */ | |
1ca2983a | 1886 | alloc_evtchn_fail: |
2688fcb7 | 1887 | gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); |
1ca2983a WL |
1888 | grant_rx_ring_fail: |
1889 | free_page((unsigned long)rxs); | |
1890 | alloc_rx_ring_fail: | |
2688fcb7 | 1891 | gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); |
1ca2983a WL |
1892 | grant_tx_ring_fail: |
1893 | free_page((unsigned long)txs); | |
1894 | fail: | |
0d160211 JF |
1895 | return err; |
1896 | } | |
1897 | ||
2688fcb7 AB |
1898 | /* Queue-specific initialisation |
1899 | * This used to be done in xennet_create_dev() but must now | |
1900 | * be run per-queue. | |
1901 | */ | |
1902 | static int xennet_init_queue(struct netfront_queue *queue) | |
1903 | { | |
1904 | unsigned short i; | |
1905 | int err = 0; | |
21f2706b | 1906 | char *devid; |
2688fcb7 AB |
1907 | |
1908 | spin_lock_init(&queue->tx_lock); | |
1909 | spin_lock_init(&queue->rx_lock); | |
1910 | ||
e99e88a9 | 1911 | timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); |
2688fcb7 | 1912 | |
21f2706b XL |
1913 | devid = strrchr(queue->info->xbdev->nodename, '/') + 1; |
1914 | snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", | |
1915 | devid, queue->id); | |
8b715010 | 1916 | |
21631d2d | 1917 | /* Initialise tx_skb_freelist as a free chain containing every entry. */ |
2688fcb7 | 1918 | queue->tx_skb_freelist = 0; |
a884daa6 | 1919 | queue->tx_pend_queue = TX_LINK_NONE; |
2688fcb7 | 1920 | for (i = 0; i < NET_TX_RING_SIZE; i++) { |
21631d2d | 1921 | queue->tx_link[i] = i + 1; |
2688fcb7 AB |
1922 | queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
1923 | queue->grant_tx_page[i] = NULL; | |
1924 | } | |
21631d2d | 1925 | queue->tx_link[NET_TX_RING_SIZE - 1] = TX_LINK_NONE; |
2688fcb7 AB |
1926 | |
1927 | /* Clear out rx_skbs */ | |
1928 | for (i = 0; i < NET_RX_RING_SIZE; i++) { | |
1929 | queue->rx_skbs[i] = NULL; | |
1930 | queue->grant_rx_ref[i] = GRANT_INVALID_REF; | |
1931 | } | |
1932 | ||
1933 | /* A grant for every tx ring slot */ | |
1f3c2eba | 1934 | if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, |
2688fcb7 AB |
1935 | &queue->gref_tx_head) < 0) { |
1936 | pr_alert("can't alloc tx grant refs\n"); | |
1937 | err = -ENOMEM; | |
1938 | goto exit; | |
1939 | } | |
1940 | ||
1941 | /* A grant for every rx ring slot */ | |
1f3c2eba | 1942 | if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, |
2688fcb7 AB |
1943 | &queue->gref_rx_head) < 0) { |
1944 | pr_alert("can't alloc rx grant refs\n"); | |
1945 | err = -ENOMEM; | |
1946 | goto exit_free_tx; | |
1947 | } | |
1948 | ||
2688fcb7 AB |
1949 | return 0; |
1950 | ||
1951 | exit_free_tx: | |
1952 | gnttab_free_grant_references(queue->gref_tx_head); | |
1953 | exit: | |
1954 | return err; | |
1955 | } | |
1956 | ||
50ee6061 AB |
1957 | static int write_queue_xenstore_keys(struct netfront_queue *queue, |
1958 | struct xenbus_transaction *xbt, int write_hierarchical) | |
1959 | { | |
1960 | /* Write the queue-specific keys into XenStore in the traditional | |
1961 | * way for a single queue, or in a queue subkeys for multiple | |
1962 | * queues. | |
1963 | */ | |
1964 | struct xenbus_device *dev = queue->info->xbdev; | |
1965 | int err; | |
1966 | const char *message; | |
1967 | char *path; | |
1968 | size_t pathsize; | |
1969 | ||
1970 | /* Choose the correct place to write the keys */ | |
1971 | if (write_hierarchical) { | |
1972 | pathsize = strlen(dev->nodename) + 10; | |
1973 | path = kzalloc(pathsize, GFP_KERNEL); | |
1974 | if (!path) { | |
1975 | err = -ENOMEM; | |
1976 | message = "out of memory while writing ring references"; | |
1977 | goto error; | |
1978 | } | |
1979 | snprintf(path, pathsize, "%s/queue-%u", | |
1980 | dev->nodename, queue->id); | |
1981 | } else { | |
1982 | path = (char *)dev->nodename; | |
1983 | } | |
1984 | ||
1985 | /* Write ring references */ | |
1986 | err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", | |
1987 | queue->tx_ring_ref); | |
1988 | if (err) { | |
1989 | message = "writing tx-ring-ref"; | |
1990 | goto error; | |
1991 | } | |
1992 | ||
1993 | err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", | |
1994 | queue->rx_ring_ref); | |
1995 | if (err) { | |
1996 | message = "writing rx-ring-ref"; | |
1997 | goto error; | |
1998 | } | |
1999 | ||
2000 | /* Write event channels; taking into account both shared | |
2001 | * and split event channel scenarios. | |
2002 | */ | |
2003 | if (queue->tx_evtchn == queue->rx_evtchn) { | |
2004 | /* Shared event channel */ | |
2005 | err = xenbus_printf(*xbt, path, | |
2006 | "event-channel", "%u", queue->tx_evtchn); | |
2007 | if (err) { | |
2008 | message = "writing event-channel"; | |
2009 | goto error; | |
2010 | } | |
2011 | } else { | |
2012 | /* Split event channels */ | |
2013 | err = xenbus_printf(*xbt, path, | |
2014 | "event-channel-tx", "%u", queue->tx_evtchn); | |
2015 | if (err) { | |
2016 | message = "writing event-channel-tx"; | |
2017 | goto error; | |
2018 | } | |
2019 | ||
2020 | err = xenbus_printf(*xbt, path, | |
2021 | "event-channel-rx", "%u", queue->rx_evtchn); | |
2022 | if (err) { | |
2023 | message = "writing event-channel-rx"; | |
2024 | goto error; | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | if (write_hierarchical) | |
2029 | kfree(path); | |
2030 | return 0; | |
2031 | ||
2032 | error: | |
2033 | if (write_hierarchical) | |
2034 | kfree(path); | |
2035 | xenbus_dev_fatal(dev, err, "%s", message); | |
2036 | return err; | |
2037 | } | |
2038 | ||
ce58725f DV |
2039 | static void xennet_destroy_queues(struct netfront_info *info) |
2040 | { | |
2041 | unsigned int i; | |
2042 | ||
ce58725f DV |
2043 | for (i = 0; i < info->netdev->real_num_tx_queues; i++) { |
2044 | struct netfront_queue *queue = &info->queues[i]; | |
2045 | ||
2046 | if (netif_running(info->netdev)) | |
2047 | napi_disable(&queue->napi); | |
2048 | netif_napi_del(&queue->napi); | |
2049 | } | |
2050 | ||
ce58725f DV |
2051 | kfree(info->queues); |
2052 | info->queues = NULL; | |
2053 | } | |
2054 | ||
6c5aa6fc DK |
2055 | |
2056 | ||
2057 | static int xennet_create_page_pool(struct netfront_queue *queue) | |
2058 | { | |
2059 | int err; | |
2060 | struct page_pool_params pp_params = { | |
2061 | .order = 0, | |
2062 | .flags = 0, | |
2063 | .pool_size = NET_RX_RING_SIZE, | |
2064 | .nid = NUMA_NO_NODE, | |
2065 | .dev = &queue->info->netdev->dev, | |
2066 | .offset = XDP_PACKET_HEADROOM, | |
2067 | .max_len = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, | |
2068 | }; | |
2069 | ||
2070 | queue->page_pool = page_pool_create(&pp_params); | |
2071 | if (IS_ERR(queue->page_pool)) { | |
2072 | err = PTR_ERR(queue->page_pool); | |
2073 | queue->page_pool = NULL; | |
2074 | return err; | |
2075 | } | |
2076 | ||
2077 | err = xdp_rxq_info_reg(&queue->xdp_rxq, queue->info->netdev, | |
b02e5a0e | 2078 | queue->id, 0); |
6c5aa6fc DK |
2079 | if (err) { |
2080 | netdev_err(queue->info->netdev, "xdp_rxq_info_reg failed\n"); | |
2081 | goto err_free_pp; | |
2082 | } | |
2083 | ||
2084 | err = xdp_rxq_info_reg_mem_model(&queue->xdp_rxq, | |
2085 | MEM_TYPE_PAGE_POOL, queue->page_pool); | |
2086 | if (err) { | |
2087 | netdev_err(queue->info->netdev, "xdp_rxq_info_reg_mem_model failed\n"); | |
2088 | goto err_unregister_rxq; | |
2089 | } | |
2090 | return 0; | |
2091 | ||
2092 | err_unregister_rxq: | |
2093 | xdp_rxq_info_unreg(&queue->xdp_rxq); | |
2094 | err_free_pp: | |
2095 | page_pool_destroy(queue->page_pool); | |
2096 | queue->page_pool = NULL; | |
2097 | return err; | |
2098 | } | |
2099 | ||
ce58725f | 2100 | static int xennet_create_queues(struct netfront_info *info, |
ca88ea12 | 2101 | unsigned int *num_queues) |
ce58725f DV |
2102 | { |
2103 | unsigned int i; | |
2104 | int ret; | |
2105 | ||
ca88ea12 | 2106 | info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), |
ce58725f DV |
2107 | GFP_KERNEL); |
2108 | if (!info->queues) | |
2109 | return -ENOMEM; | |
2110 | ||
ca88ea12 | 2111 | for (i = 0; i < *num_queues; i++) { |
ce58725f DV |
2112 | struct netfront_queue *queue = &info->queues[i]; |
2113 | ||
2114 | queue->id = i; | |
2115 | queue->info = info; | |
2116 | ||
2117 | ret = xennet_init_queue(queue); | |
2118 | if (ret < 0) { | |
f599c64f | 2119 | dev_warn(&info->xbdev->dev, |
69cb8524 | 2120 | "only created %d queues\n", i); |
ca88ea12 | 2121 | *num_queues = i; |
ce58725f DV |
2122 | break; |
2123 | } | |
2124 | ||
6c5aa6fc DK |
2125 | /* use page pool recycling instead of buddy allocator */ |
2126 | ret = xennet_create_page_pool(queue); | |
2127 | if (ret < 0) { | |
2128 | dev_err(&info->xbdev->dev, "can't allocate page pool\n"); | |
2129 | *num_queues = i; | |
2130 | return ret; | |
2131 | } | |
2132 | ||
ce58725f DV |
2133 | netif_napi_add(queue->info->netdev, &queue->napi, |
2134 | xennet_poll, 64); | |
2135 | if (netif_running(info->netdev)) | |
2136 | napi_enable(&queue->napi); | |
2137 | } | |
2138 | ||
ca88ea12 | 2139 | netif_set_real_num_tx_queues(info->netdev, *num_queues); |
ce58725f | 2140 | |
ca88ea12 | 2141 | if (*num_queues == 0) { |
f599c64f | 2142 | dev_err(&info->xbdev->dev, "no queues\n"); |
ce58725f DV |
2143 | return -EINVAL; |
2144 | } | |
2145 | return 0; | |
2146 | } | |
2147 | ||
0d160211 | 2148 | /* Common code used when first setting up, and when resuming. */ |
f502bf2b | 2149 | static int talk_to_netback(struct xenbus_device *dev, |
0d160211 JF |
2150 | struct netfront_info *info) |
2151 | { | |
2152 | const char *message; | |
2153 | struct xenbus_transaction xbt; | |
2154 | int err; | |
2688fcb7 AB |
2155 | unsigned int feature_split_evtchn; |
2156 | unsigned int i = 0; | |
50ee6061 | 2157 | unsigned int max_queues = 0; |
2688fcb7 AB |
2158 | struct netfront_queue *queue = NULL; |
2159 | unsigned int num_queues = 1; | |
0d160211 | 2160 | |
2688fcb7 AB |
2161 | info->netdev->irq = 0; |
2162 | ||
50ee6061 | 2163 | /* Check if backend supports multiple queues */ |
2890ea5c JG |
2164 | max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
2165 | "multi-queue-max-queues", 1); | |
50ee6061 AB |
2166 | num_queues = min(max_queues, xennet_max_queues); |
2167 | ||
2688fcb7 | 2168 | /* Check feature-split-event-channels */ |
2890ea5c JG |
2169 | feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, |
2170 | "feature-split-event-channels", 0); | |
2688fcb7 AB |
2171 | |
2172 | /* Read mac addr. */ | |
2173 | err = xen_net_read_mac(dev, info->netdev->dev_addr); | |
2174 | if (err) { | |
2175 | xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); | |
cb257783 | 2176 | goto out_unlocked; |
2688fcb7 AB |
2177 | } |
2178 | ||
6c5aa6fc DK |
2179 | info->netback_has_xdp_headroom = xenbus_read_unsigned(info->xbdev->otherend, |
2180 | "feature-xdp-headroom", 0); | |
2181 | if (info->netback_has_xdp_headroom) { | |
2182 | /* set the current xen-netfront xdp state */ | |
2183 | err = talk_to_netback_xdp(info, info->netfront_xdp_enabled ? | |
2184 | NETBACK_XDP_HEADROOM_ENABLE : | |
2185 | NETBACK_XDP_HEADROOM_DISABLE); | |
2186 | if (err) | |
2187 | goto out_unlocked; | |
2188 | } | |
2189 | ||
f599c64f | 2190 | rtnl_lock(); |
ce58725f DV |
2191 | if (info->queues) |
2192 | xennet_destroy_queues(info); | |
2193 | ||
a884daa6 JG |
2194 | /* For the case of a reconnect reset the "broken" indicator. */ |
2195 | info->broken = false; | |
2196 | ||
ca88ea12 | 2197 | err = xennet_create_queues(info, &num_queues); |
e2e004ac RL |
2198 | if (err < 0) { |
2199 | xenbus_dev_fatal(dev, err, "creating queues"); | |
2200 | kfree(info->queues); | |
2201 | info->queues = NULL; | |
2202 | goto out; | |
2203 | } | |
f599c64f | 2204 | rtnl_unlock(); |
2688fcb7 AB |
2205 | |
2206 | /* Create shared ring, alloc event channel -- for each queue */ | |
2207 | for (i = 0; i < num_queues; ++i) { | |
2208 | queue = &info->queues[i]; | |
2688fcb7 | 2209 | err = setup_netfront(dev, queue, feature_split_evtchn); |
e2e004ac RL |
2210 | if (err) |
2211 | goto destroy_ring; | |
2688fcb7 | 2212 | } |
0d160211 JF |
2213 | |
2214 | again: | |
2215 | err = xenbus_transaction_start(&xbt); | |
2216 | if (err) { | |
2217 | xenbus_dev_fatal(dev, err, "starting transaction"); | |
2218 | goto destroy_ring; | |
2219 | } | |
2220 | ||
812494d9 | 2221 | if (xenbus_exists(XBT_NIL, |
2222 | info->xbdev->otherend, "multi-queue-max-queues")) { | |
50ee6061 | 2223 | /* Write the number of queues */ |
812494d9 | 2224 | err = xenbus_printf(xbt, dev->nodename, |
2225 | "multi-queue-num-queues", "%u", num_queues); | |
d634bf2c | 2226 | if (err) { |
50ee6061 AB |
2227 | message = "writing multi-queue-num-queues"; |
2228 | goto abort_transaction_no_dev_fatal; | |
d634bf2c | 2229 | } |
812494d9 | 2230 | } |
50ee6061 | 2231 | |
812494d9 | 2232 | if (num_queues == 1) { |
2233 | err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ | |
2234 | if (err) | |
2235 | goto abort_transaction_no_dev_fatal; | |
2236 | } else { | |
50ee6061 AB |
2237 | /* Write the keys for each queue */ |
2238 | for (i = 0; i < num_queues; ++i) { | |
2239 | queue = &info->queues[i]; | |
2240 | err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ | |
2241 | if (err) | |
2242 | goto abort_transaction_no_dev_fatal; | |
d634bf2c | 2243 | } |
0d160211 JF |
2244 | } |
2245 | ||
50ee6061 | 2246 | /* The remaining keys are not queue-specific */ |
0d160211 JF |
2247 | err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
2248 | 1); | |
2249 | if (err) { | |
2250 | message = "writing request-rx-copy"; | |
2251 | goto abort_transaction; | |
2252 | } | |
2253 | ||
2254 | err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); | |
2255 | if (err) { | |
2256 | message = "writing feature-rx-notify"; | |
2257 | goto abort_transaction; | |
2258 | } | |
2259 | ||
2260 | err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); | |
2261 | if (err) { | |
2262 | message = "writing feature-sg"; | |
2263 | goto abort_transaction; | |
2264 | } | |
2265 | ||
2266 | err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); | |
2267 | if (err) { | |
2268 | message = "writing feature-gso-tcpv4"; | |
2269 | goto abort_transaction; | |
2270 | } | |
2271 | ||
2c0057de PD |
2272 | err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
2273 | if (err) { | |
2274 | message = "writing feature-gso-tcpv6"; | |
2275 | goto abort_transaction; | |
2276 | } | |
2277 | ||
2278 | err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", | |
2279 | "1"); | |
2280 | if (err) { | |
2281 | message = "writing feature-ipv6-csum-offload"; | |
2282 | goto abort_transaction; | |
2283 | } | |
2284 | ||
0d160211 JF |
2285 | err = xenbus_transaction_end(xbt, 0); |
2286 | if (err) { | |
2287 | if (err == -EAGAIN) | |
2288 | goto again; | |
2289 | xenbus_dev_fatal(dev, err, "completing transaction"); | |
2290 | goto destroy_ring; | |
2291 | } | |
2292 | ||
2293 | return 0; | |
2294 | ||
2295 | abort_transaction: | |
0d160211 | 2296 | xenbus_dev_fatal(dev, err, "%s", message); |
50ee6061 AB |
2297 | abort_transaction_no_dev_fatal: |
2298 | xenbus_transaction_end(xbt, 1); | |
0d160211 JF |
2299 | destroy_ring: |
2300 | xennet_disconnect_backend(info); | |
f599c64f | 2301 | rtnl_lock(); |
e2e004ac | 2302 | xennet_destroy_queues(info); |
0d160211 | 2303 | out: |
f599c64f | 2304 | rtnl_unlock(); |
cb257783 | 2305 | out_unlocked: |
d86b5672 | 2306 | device_unregister(&dev->dev); |
0d160211 JF |
2307 | return err; |
2308 | } | |
2309 | ||
0d160211 JF |
2310 | static int xennet_connect(struct net_device *dev) |
2311 | { | |
2312 | struct netfront_info *np = netdev_priv(dev); | |
2688fcb7 | 2313 | unsigned int num_queues = 0; |
a5b5dc3c | 2314 | int err; |
2688fcb7 AB |
2315 | unsigned int j = 0; |
2316 | struct netfront_queue *queue = NULL; | |
0d160211 | 2317 | |
2890ea5c | 2318 | if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { |
0d160211 | 2319 | dev_info(&dev->dev, |
898eb71c | 2320 | "backend does not support copying receive path\n"); |
0d160211 JF |
2321 | return -ENODEV; |
2322 | } | |
2323 | ||
f502bf2b | 2324 | err = talk_to_netback(np->xbdev, np); |
0d160211 JF |
2325 | if (err) |
2326 | return err; | |
6c5aa6fc DK |
2327 | if (np->netback_has_xdp_headroom) |
2328 | pr_info("backend supports XDP headroom\n"); | |
0d160211 | 2329 | |
2688fcb7 AB |
2330 | /* talk_to_netback() sets the correct number of queues */ |
2331 | num_queues = dev->real_num_tx_queues; | |
2332 | ||
f599c64f RL |
2333 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
2334 | err = register_netdev(dev); | |
2335 | if (err) { | |
2336 | pr_warn("%s: register_netdev err=%d\n", __func__, err); | |
2337 | device_unregister(&np->xbdev->dev); | |
2338 | return err; | |
2339 | } | |
2340 | } | |
2341 | ||
45c8184c RL |
2342 | rtnl_lock(); |
2343 | netdev_update_features(dev); | |
2344 | rtnl_unlock(); | |
2345 | ||
0d160211 | 2346 | /* |
a5b5dc3c | 2347 | * All public and private state should now be sane. Get |
0d160211 JF |
2348 | * ready to start sending and receiving packets and give the driver |
2349 | * domain a kick because we've probably just requeued some | |
2350 | * packets. | |
2351 | */ | |
2352 | netif_carrier_on(np->netdev); | |
2688fcb7 AB |
2353 | for (j = 0; j < num_queues; ++j) { |
2354 | queue = &np->queues[j]; | |
f50b4076 | 2355 | |
2688fcb7 AB |
2356 | notify_remote_via_irq(queue->tx_irq); |
2357 | if (queue->tx_irq != queue->rx_irq) | |
2358 | notify_remote_via_irq(queue->rx_irq); | |
2688fcb7 | 2359 | |
f50b4076 DV |
2360 | spin_lock_irq(&queue->tx_lock); |
2361 | xennet_tx_buf_gc(queue); | |
2688fcb7 | 2362 | spin_unlock_irq(&queue->tx_lock); |
f50b4076 DV |
2363 | |
2364 | spin_lock_bh(&queue->rx_lock); | |
2365 | xennet_alloc_rx_buffers(queue); | |
2688fcb7 AB |
2366 | spin_unlock_bh(&queue->rx_lock); |
2367 | } | |
0d160211 JF |
2368 | |
2369 | return 0; | |
2370 | } | |
2371 | ||
80708602 | 2372 | /* |
0d160211 JF |
2373 | * Callback received when the backend's state changes. |
2374 | */ | |
f502bf2b | 2375 | static void netback_changed(struct xenbus_device *dev, |
0d160211 JF |
2376 | enum xenbus_state backend_state) |
2377 | { | |
1b713e00 | 2378 | struct netfront_info *np = dev_get_drvdata(&dev->dev); |
0d160211 JF |
2379 | struct net_device *netdev = np->netdev; |
2380 | ||
2381 | dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); | |
2382 | ||
8edfe2e9 JG |
2383 | wake_up_all(&module_wq); |
2384 | ||
0d160211 JF |
2385 | switch (backend_state) { |
2386 | case XenbusStateInitialising: | |
2387 | case XenbusStateInitialised: | |
b78c9512 NI |
2388 | case XenbusStateReconfiguring: |
2389 | case XenbusStateReconfigured: | |
0d160211 | 2390 | case XenbusStateUnknown: |
0d160211 JF |
2391 | break; |
2392 | ||
2393 | case XenbusStateInitWait: | |
2394 | if (dev->state != XenbusStateInitialising) | |
2395 | break; | |
2396 | if (xennet_connect(netdev) != 0) | |
2397 | break; | |
2398 | xenbus_switch_state(dev, XenbusStateConnected); | |
08e34eb1 LE |
2399 | break; |
2400 | ||
2401 | case XenbusStateConnected: | |
ee89bab1 | 2402 | netdev_notify_peers(netdev); |
0d160211 JF |
2403 | break; |
2404 | ||
bce3ea81 DV |
2405 | case XenbusStateClosed: |
2406 | if (dev->state == XenbusStateClosed) | |
2407 | break; | |
df561f66 | 2408 | fallthrough; /* Missed the backend's CLOSING state */ |
0d160211 JF |
2409 | case XenbusStateClosing: |
2410 | xenbus_frontend_closed(dev); | |
2411 | break; | |
2412 | } | |
2413 | } | |
2414 | ||
e0ce4af9 IC |
2415 | static const struct xennet_stat { |
2416 | char name[ETH_GSTRING_LEN]; | |
2417 | u16 offset; | |
2418 | } xennet_stats[] = { | |
2419 | { | |
2420 | "rx_gso_checksum_fixup", | |
2421 | offsetof(struct netfront_info, rx_gso_checksum_fixup) | |
2422 | }, | |
2423 | }; | |
2424 | ||
2425 | static int xennet_get_sset_count(struct net_device *dev, int string_set) | |
2426 | { | |
2427 | switch (string_set) { | |
2428 | case ETH_SS_STATS: | |
2429 | return ARRAY_SIZE(xennet_stats); | |
2430 | default: | |
2431 | return -EINVAL; | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | static void xennet_get_ethtool_stats(struct net_device *dev, | |
2436 | struct ethtool_stats *stats, u64 * data) | |
2437 | { | |
2438 | void *np = netdev_priv(dev); | |
2439 | int i; | |
2440 | ||
2441 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
2688fcb7 | 2442 | data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); |
e0ce4af9 IC |
2443 | } |
2444 | ||
2445 | static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) | |
2446 | { | |
2447 | int i; | |
2448 | ||
2449 | switch (stringset) { | |
2450 | case ETH_SS_STATS: | |
2451 | for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) | |
2452 | memcpy(data + i * ETH_GSTRING_LEN, | |
2453 | xennet_stats[i].name, ETH_GSTRING_LEN); | |
2454 | break; | |
2455 | } | |
2456 | } | |
2457 | ||
0fc0b732 | 2458 | static const struct ethtool_ops xennet_ethtool_ops = |
0d160211 | 2459 | { |
0d160211 | 2460 | .get_link = ethtool_op_get_link, |
e0ce4af9 IC |
2461 | |
2462 | .get_sset_count = xennet_get_sset_count, | |
2463 | .get_ethtool_stats = xennet_get_ethtool_stats, | |
2464 | .get_strings = xennet_get_strings, | |
91ffb9d3 | 2465 | .get_ts_info = ethtool_op_get_ts_info, |
0d160211 JF |
2466 | }; |
2467 | ||
2468 | #ifdef CONFIG_SYSFS | |
1f3c2eba DV |
2469 | static ssize_t show_rxbuf(struct device *dev, |
2470 | struct device_attribute *attr, char *buf) | |
0d160211 | 2471 | { |
1f3c2eba | 2472 | return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); |
0d160211 JF |
2473 | } |
2474 | ||
1f3c2eba DV |
2475 | static ssize_t store_rxbuf(struct device *dev, |
2476 | struct device_attribute *attr, | |
2477 | const char *buf, size_t len) | |
0d160211 | 2478 | { |
0d160211 | 2479 | char *endp; |
0d160211 JF |
2480 | |
2481 | if (!capable(CAP_NET_ADMIN)) | |
2482 | return -EPERM; | |
2483 | ||
8ed7ec13 | 2484 | simple_strtoul(buf, &endp, 0); |
0d160211 JF |
2485 | if (endp == buf) |
2486 | return -EBADMSG; | |
2487 | ||
1f3c2eba | 2488 | /* rxbuf_min and rxbuf_max are no longer configurable. */ |
0d160211 | 2489 | |
0d160211 JF |
2490 | return len; |
2491 | } | |
2492 | ||
d61e4038 JP |
2493 | static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); |
2494 | static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); | |
2495 | static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); | |
0d160211 | 2496 | |
27b917e5 TI |
2497 | static struct attribute *xennet_dev_attrs[] = { |
2498 | &dev_attr_rxbuf_min.attr, | |
2499 | &dev_attr_rxbuf_max.attr, | |
2500 | &dev_attr_rxbuf_cur.attr, | |
2501 | NULL | |
2502 | }; | |
0d160211 | 2503 | |
27b917e5 TI |
2504 | static const struct attribute_group xennet_dev_group = { |
2505 | .attrs = xennet_dev_attrs | |
2506 | }; | |
0d160211 JF |
2507 | #endif /* CONFIG_SYSFS */ |
2508 | ||
c2c63310 | 2509 | static void xennet_bus_close(struct xenbus_device *dev) |
0d160211 | 2510 | { |
c2c63310 | 2511 | int ret; |
0d160211 | 2512 | |
c2c63310 AR |
2513 | if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) |
2514 | return; | |
2515 | do { | |
5b5971df | 2516 | xenbus_switch_state(dev, XenbusStateClosing); |
c2c63310 AR |
2517 | ret = wait_event_timeout(module_wq, |
2518 | xenbus_read_driver_state(dev->otherend) == | |
2519 | XenbusStateClosing || | |
2520 | xenbus_read_driver_state(dev->otherend) == | |
2521 | XenbusStateClosed || | |
2522 | xenbus_read_driver_state(dev->otherend) == | |
2523 | XenbusStateUnknown, | |
2524 | XENNET_TIMEOUT); | |
2525 | } while (!ret); | |
2526 | ||
2527 | if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) | |
2528 | return; | |
5b5971df | 2529 | |
c2c63310 | 2530 | do { |
5b5971df | 2531 | xenbus_switch_state(dev, XenbusStateClosed); |
c2c63310 AR |
2532 | ret = wait_event_timeout(module_wq, |
2533 | xenbus_read_driver_state(dev->otherend) == | |
2534 | XenbusStateClosed || | |
2535 | xenbus_read_driver_state(dev->otherend) == | |
2536 | XenbusStateUnknown, | |
2537 | XENNET_TIMEOUT); | |
2538 | } while (!ret); | |
2539 | } | |
2540 | ||
2541 | static int xennet_remove(struct xenbus_device *dev) | |
2542 | { | |
2543 | struct netfront_info *info = dev_get_drvdata(&dev->dev); | |
5b5971df | 2544 | |
c2c63310 | 2545 | xennet_bus_close(dev); |
0d160211 JF |
2546 | xennet_disconnect_backend(info); |
2547 | ||
f599c64f RL |
2548 | if (info->netdev->reg_state == NETREG_REGISTERED) |
2549 | unregister_netdev(info->netdev); | |
6bc96d04 | 2550 | |
f599c64f RL |
2551 | if (info->queues) { |
2552 | rtnl_lock(); | |
9a873c71 | 2553 | xennet_destroy_queues(info); |
f599c64f RL |
2554 | rtnl_unlock(); |
2555 | } | |
900e1833 | 2556 | xennet_free_netdev(info->netdev); |
0d160211 JF |
2557 | |
2558 | return 0; | |
2559 | } | |
2560 | ||
95afae48 DV |
2561 | static const struct xenbus_device_id netfront_ids[] = { |
2562 | { "vif" }, | |
2563 | { "" } | |
2564 | }; | |
2565 | ||
2566 | static struct xenbus_driver netfront_driver = { | |
2567 | .ids = netfront_ids, | |
0d160211 | 2568 | .probe = netfront_probe, |
8e0e46bb | 2569 | .remove = xennet_remove, |
0d160211 | 2570 | .resume = netfront_resume, |
f502bf2b | 2571 | .otherend_changed = netback_changed, |
95afae48 | 2572 | }; |
0d160211 JF |
2573 | |
2574 | static int __init netif_init(void) | |
2575 | { | |
6e833587 | 2576 | if (!xen_domain()) |
0d160211 JF |
2577 | return -ENODEV; |
2578 | ||
51c71a3b | 2579 | if (!xen_has_pv_nic_devices()) |
b9136d20 IM |
2580 | return -ENODEV; |
2581 | ||
383eda32 | 2582 | pr_info("Initialising Xen virtual ethernet driver\n"); |
0d160211 | 2583 | |
034702a6 | 2584 | /* Allow as many queues as there are CPUs inut max. 8 if user has not |
32a84405 WL |
2585 | * specified a value. |
2586 | */ | |
2587 | if (xennet_max_queues == 0) | |
034702a6 JG |
2588 | xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
2589 | num_online_cpus()); | |
50ee6061 | 2590 | |
ffb78a26 | 2591 | return xenbus_register_frontend(&netfront_driver); |
0d160211 JF |
2592 | } |
2593 | module_init(netif_init); | |
2594 | ||
2595 | ||
2596 | static void __exit netif_exit(void) | |
2597 | { | |
ffb78a26 | 2598 | xenbus_unregister_driver(&netfront_driver); |
0d160211 JF |
2599 | } |
2600 | module_exit(netif_exit); | |
2601 | ||
2602 | MODULE_DESCRIPTION("Xen virtual network device frontend"); | |
2603 | MODULE_LICENSE("GPL"); | |
d2f0c52b | 2604 | MODULE_ALIAS("xen:vif"); |
4f93f09b | 2605 | MODULE_ALIAS("xennet"); |