Commit | Line | Data |
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f942dc25 IC |
1 | /* |
2 | * Back-end of the driver for virtual network devices. This portion of the | |
3 | * driver exports a 'unified' network-device interface that can be accessed | |
4 | * by any operating system that implements a compatible front end. A | |
5 | * reference front-end implementation can be found in: | |
6 | * drivers/net/xen-netfront.c | |
7 | * | |
8 | * Copyright (c) 2002-2005, K A Fraser | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License version 2 | |
12 | * as published by the Free Software Foundation; or, when distributed | |
13 | * separately from the Linux kernel or incorporated into other | |
14 | * software packages, subject to the following license: | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
17 | * of this source file (the "Software"), to deal in the Software without | |
18 | * restriction, including without limitation the rights to use, copy, modify, | |
19 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
20 | * and to permit persons to whom the Software is furnished to do so, subject to | |
21 | * the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice shall be included in | |
24 | * all copies or substantial portions of the Software. | |
25 | * | |
26 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
27 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
28 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
29 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
30 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
31 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
32 | * IN THE SOFTWARE. | |
33 | */ | |
34 | ||
35 | #include "common.h" | |
36 | ||
37 | #include <linux/kthread.h> | |
38 | #include <linux/if_vlan.h> | |
39 | #include <linux/udp.h> | |
e3377f36 | 40 | #include <linux/highmem.h> |
f6d827b1 | 41 | #include <linux/skbuff_ref.h> |
f942dc25 IC |
42 | |
43 | #include <net/tcp.h> | |
44 | ||
ca981633 | 45 | #include <xen/xen.h> |
f942dc25 IC |
46 | #include <xen/events.h> |
47 | #include <xen/interface/memory.h> | |
a9fd60e2 | 48 | #include <xen/page.h> |
f942dc25 IC |
49 | |
50 | #include <asm/xen/hypercall.h> | |
f942dc25 | 51 | |
e1f00a69 WL |
52 | /* Provide an option to disable split event channels at load time as |
53 | * event channels are limited resource. Split event channels are | |
54 | * enabled by default. | |
55 | */ | |
c489dbb1 | 56 | bool separate_tx_rx_irq = true; |
e1f00a69 WL |
57 | module_param(separate_tx_rx_irq, bool, 0644); |
58 | ||
f48da8b1 DV |
59 | /* The time that packets can stay on the guest Rx internal queue |
60 | * before they are dropped. | |
09350788 ZK |
61 | */ |
62 | unsigned int rx_drain_timeout_msecs = 10000; | |
63 | module_param(rx_drain_timeout_msecs, uint, 0444); | |
09350788 | 64 | |
ecf08d2d DV |
65 | /* The length of time before the frontend is considered unresponsive |
66 | * because it isn't providing Rx slots. | |
67 | */ | |
26c0e102 | 68 | unsigned int rx_stall_timeout_msecs = 60000; |
ecf08d2d | 69 | module_param(rx_stall_timeout_msecs, uint, 0444); |
ecf08d2d | 70 | |
56dd5af9 | 71 | #define MAX_QUEUES_DEFAULT 8 |
8d3d53b3 AB |
72 | unsigned int xenvif_max_queues; |
73 | module_param_named(max_queues, xenvif_max_queues, uint, 0644); | |
74 | MODULE_PARM_DESC(max_queues, | |
75 | "Maximum number of queues per virtual interface"); | |
76 | ||
2810e5b9 WL |
77 | /* |
78 | * This is the maximum slots a skb can have. If a guest sends a skb | |
79 | * which exceeds this limit it is considered malicious. | |
80 | */ | |
37641494 WL |
81 | #define FATAL_SKB_SLOTS_DEFAULT 20 |
82 | static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT; | |
83 | module_param(fatal_skb_slots, uint, 0444); | |
84 | ||
7e5d7753 MC |
85 | /* The amount to copy out of the first guest Tx slot into the skb's |
86 | * linear area. If the first slot has more data, it will be mapped | |
87 | * and put into the first frag. | |
88 | * | |
89 | * This is sized to avoid pulling headers from the frags for most | |
90 | * TCP/IP packets. | |
91 | */ | |
92 | #define XEN_NETBACK_TX_COPY_LEN 128 | |
93 | ||
40d8abde PD |
94 | /* This is the maximum number of flows in the hash cache. */ |
95 | #define XENVIF_HASH_CACHE_SIZE_DEFAULT 64 | |
96 | unsigned int xenvif_hash_cache_size = XENVIF_HASH_CACHE_SIZE_DEFAULT; | |
97 | module_param_named(hash_cache_size, xenvif_hash_cache_size, uint, 0644); | |
98 | MODULE_PARM_DESC(hash_cache_size, "Number of flows in the hash cache"); | |
7e5d7753 | 99 | |
1c9535c7 DK |
100 | /* The module parameter tells that we have to put data |
101 | * for xen-netfront with the XDP_PACKET_HEADROOM offset | |
102 | * needed for XDP processing | |
103 | */ | |
104 | bool provides_xdp_headroom = true; | |
105 | module_param(provides_xdp_headroom, bool, 0644); | |
106 | ||
e9ce7cb6 | 107 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7b55984c | 108 | s8 status); |
7376419a | 109 | |
e9ce7cb6 | 110 | static void make_tx_response(struct xenvif_queue *queue, |
7b55984c | 111 | const struct xen_netif_tx_request *txp, |
562abd39 | 112 | unsigned int extra_count, |
7b55984c | 113 | s8 status); |
b3f980bd | 114 | |
5834e72e JG |
115 | static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx); |
116 | ||
e9ce7cb6 | 117 | static inline int tx_work_todo(struct xenvif_queue *queue); |
b3f980bd | 118 | |
e9ce7cb6 | 119 | static inline unsigned long idx_to_pfn(struct xenvif_queue *queue, |
ea066ad1 | 120 | u16 idx) |
f942dc25 | 121 | { |
e9ce7cb6 | 122 | return page_to_pfn(queue->mmap_pages[idx]); |
f942dc25 IC |
123 | } |
124 | ||
e9ce7cb6 | 125 | static inline unsigned long idx_to_kaddr(struct xenvif_queue *queue, |
ea066ad1 | 126 | u16 idx) |
f942dc25 | 127 | { |
e9ce7cb6 | 128 | return (unsigned long)pfn_to_kaddr(idx_to_pfn(queue, idx)); |
f942dc25 IC |
129 | } |
130 | ||
7aceb47a ZK |
131 | #define callback_param(vif, pending_idx) \ |
132 | (vif->pending_tx_info[pending_idx].callback_struct) | |
133 | ||
f53c3fe8 ZK |
134 | /* Find the containing VIF's structure from a pointer in pending_tx_info array |
135 | */ | |
b63ca3e8 | 136 | static inline struct xenvif_queue *ubuf_to_queue(const struct ubuf_info_msgzc *ubuf) |
3e2234b3 | 137 | { |
f53c3fe8 ZK |
138 | u16 pending_idx = ubuf->desc; |
139 | struct pending_tx_info *temp = | |
140 | container_of(ubuf, struct pending_tx_info, callback_struct); | |
141 | return container_of(temp - pending_idx, | |
e9ce7cb6 | 142 | struct xenvif_queue, |
f53c3fe8 | 143 | pending_tx_info[0]); |
3e2234b3 | 144 | } |
f53c3fe8 | 145 | |
ea066ad1 IC |
146 | static u16 frag_get_pending_idx(skb_frag_t *frag) |
147 | { | |
b54c9d5b | 148 | return (u16)skb_frag_off(frag); |
ea066ad1 IC |
149 | } |
150 | ||
151 | static void frag_set_pending_idx(skb_frag_t *frag, u16 pending_idx) | |
152 | { | |
b54c9d5b | 153 | skb_frag_off_set(frag, pending_idx); |
ea066ad1 IC |
154 | } |
155 | ||
f942dc25 IC |
156 | static inline pending_ring_idx_t pending_index(unsigned i) |
157 | { | |
158 | return i & (MAX_PENDING_REQS-1); | |
159 | } | |
160 | ||
e9ce7cb6 | 161 | void xenvif_kick_thread(struct xenvif_queue *queue) |
b3f980bd | 162 | { |
e9ce7cb6 | 163 | wake_up(&queue->wq); |
b3f980bd WL |
164 | } |
165 | ||
e9ce7cb6 | 166 | void xenvif_napi_schedule_or_enable_events(struct xenvif_queue *queue) |
f942dc25 IC |
167 | { |
168 | int more_to_do; | |
169 | ||
e9ce7cb6 | 170 | RING_FINAL_CHECK_FOR_REQUESTS(&queue->tx, more_to_do); |
f942dc25 IC |
171 | |
172 | if (more_to_do) | |
e9ce7cb6 | 173 | napi_schedule(&queue->napi); |
23025393 JG |
174 | else if (atomic_fetch_andnot(NETBK_TX_EOI | NETBK_COMMON_EOI, |
175 | &queue->eoi_pending) & | |
176 | (NETBK_TX_EOI | NETBK_COMMON_EOI)) | |
177 | xen_irq_lateeoi(queue->tx_irq, 0); | |
f942dc25 IC |
178 | } |
179 | ||
e9ce7cb6 | 180 | static void tx_add_credit(struct xenvif_queue *queue) |
f942dc25 IC |
181 | { |
182 | unsigned long max_burst, max_credit; | |
183 | ||
184 | /* | |
185 | * Allow a burst big enough to transmit a jumbo packet of up to 128kB. | |
186 | * Otherwise the interface can seize up due to insufficient credit. | |
187 | */ | |
0f589967 | 188 | max_burst = max(131072UL, queue->credit_bytes); |
f942dc25 IC |
189 | |
190 | /* Take care that adding a new chunk of credit doesn't wrap to zero. */ | |
e9ce7cb6 WL |
191 | max_credit = queue->remaining_credit + queue->credit_bytes; |
192 | if (max_credit < queue->remaining_credit) | |
f942dc25 IC |
193 | max_credit = ULONG_MAX; /* wrapped: clamp to ULONG_MAX */ |
194 | ||
e9ce7cb6 | 195 | queue->remaining_credit = min(max_credit, max_burst); |
dfa523ae | 196 | queue->rate_limited = false; |
f942dc25 IC |
197 | } |
198 | ||
cac6a8f9 | 199 | void xenvif_tx_credit_callback(struct timer_list *t) |
f942dc25 | 200 | { |
cac6a8f9 | 201 | struct xenvif_queue *queue = from_timer(queue, t, credit_timeout); |
e9ce7cb6 WL |
202 | tx_add_credit(queue); |
203 | xenvif_napi_schedule_or_enable_events(queue); | |
f942dc25 IC |
204 | } |
205 | ||
e9ce7cb6 | 206 | static void xenvif_tx_err(struct xenvif_queue *queue, |
562abd39 PD |
207 | struct xen_netif_tx_request *txp, |
208 | unsigned int extra_count, RING_IDX end) | |
f942dc25 | 209 | { |
e9ce7cb6 | 210 | RING_IDX cons = queue->tx.req_cons; |
f942dc25 IC |
211 | |
212 | do { | |
562abd39 | 213 | make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR); |
b9149729 | 214 | if (cons == end) |
f942dc25 | 215 | break; |
68a33bfd | 216 | RING_COPY_REQUEST(&queue->tx, cons++, txp); |
72eec92a | 217 | extra_count = 0; /* only the first frag can have extras */ |
f942dc25 | 218 | } while (1); |
e9ce7cb6 | 219 | queue->tx.req_cons = cons; |
f942dc25 IC |
220 | } |
221 | ||
7376419a | 222 | static void xenvif_fatal_tx_err(struct xenvif *vif) |
48856286 IC |
223 | { |
224 | netdev_err(vif->dev, "fatal error; disabling device\n"); | |
e9d8b2c2 | 225 | vif->disabled = true; |
e9ce7cb6 | 226 | /* Disable the vif from queue 0's kthread */ |
b17075d5 | 227 | if (vif->num_queues) |
e9ce7cb6 | 228 | xenvif_kick_thread(&vif->queues[0]); |
48856286 IC |
229 | } |
230 | ||
e9ce7cb6 | 231 | static int xenvif_count_requests(struct xenvif_queue *queue, |
7376419a | 232 | struct xen_netif_tx_request *first, |
562abd39 | 233 | unsigned int extra_count, |
7376419a WL |
234 | struct xen_netif_tx_request *txp, |
235 | int work_to_do) | |
f942dc25 | 236 | { |
e9ce7cb6 | 237 | RING_IDX cons = queue->tx.req_cons; |
2810e5b9 WL |
238 | int slots = 0; |
239 | int drop_err = 0; | |
59ccb4eb | 240 | int more_data; |
f942dc25 IC |
241 | |
242 | if (!(first->flags & XEN_NETTXF_more_data)) | |
243 | return 0; | |
244 | ||
245 | do { | |
59ccb4eb WL |
246 | struct xen_netif_tx_request dropped_tx = { 0 }; |
247 | ||
2810e5b9 | 248 | if (slots >= work_to_do) { |
e9ce7cb6 | 249 | netdev_err(queue->vif->dev, |
2810e5b9 WL |
250 | "Asked for %d slots but exceeds this limit\n", |
251 | work_to_do); | |
e9ce7cb6 | 252 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 253 | return -ENODATA; |
f942dc25 IC |
254 | } |
255 | ||
2810e5b9 WL |
256 | /* This guest is really using too many slots and |
257 | * considered malicious. | |
258 | */ | |
37641494 | 259 | if (unlikely(slots >= fatal_skb_slots)) { |
e9ce7cb6 | 260 | netdev_err(queue->vif->dev, |
2810e5b9 | 261 | "Malicious frontend using %d slots, threshold %u\n", |
37641494 | 262 | slots, fatal_skb_slots); |
e9ce7cb6 | 263 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 264 | return -E2BIG; |
f942dc25 IC |
265 | } |
266 | ||
2810e5b9 | 267 | /* Xen network protocol had implicit dependency on |
37641494 WL |
268 | * MAX_SKB_FRAGS. XEN_NETBK_LEGACY_SLOTS_MAX is set to |
269 | * the historical MAX_SKB_FRAGS value 18 to honor the | |
270 | * same behavior as before. Any packet using more than | |
271 | * 18 slots but less than fatal_skb_slots slots is | |
272 | * dropped | |
2810e5b9 | 273 | */ |
37641494 | 274 | if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) { |
2810e5b9 | 275 | if (net_ratelimit()) |
e9ce7cb6 | 276 | netdev_dbg(queue->vif->dev, |
2810e5b9 | 277 | "Too many slots (%d) exceeding limit (%d), dropping packet\n", |
37641494 | 278 | slots, XEN_NETBK_LEGACY_SLOTS_MAX); |
2810e5b9 WL |
279 | drop_err = -E2BIG; |
280 | } | |
281 | ||
59ccb4eb WL |
282 | if (drop_err) |
283 | txp = &dropped_tx; | |
284 | ||
68a33bfd | 285 | RING_COPY_REQUEST(&queue->tx, cons + slots, txp); |
03393fd5 WL |
286 | |
287 | /* If the guest submitted a frame >= 64 KiB then | |
288 | * first->size overflowed and following slots will | |
289 | * appear to be larger than the frame. | |
290 | * | |
291 | * This cannot be fatal error as there are buggy | |
292 | * frontends that do this. | |
293 | * | |
294 | * Consume all slots and drop the packet. | |
295 | */ | |
296 | if (!drop_err && txp->size > first->size) { | |
297 | if (net_ratelimit()) | |
e9ce7cb6 | 298 | netdev_dbg(queue->vif->dev, |
03393fd5 WL |
299 | "Invalid tx request, slot size %u > remaining size %u\n", |
300 | txp->size, first->size); | |
301 | drop_err = -EIO; | |
f942dc25 IC |
302 | } |
303 | ||
304 | first->size -= txp->size; | |
2810e5b9 | 305 | slots++; |
f942dc25 | 306 | |
d0089e8a | 307 | if (unlikely((txp->offset + txp->size) > XEN_PAGE_SIZE)) { |
68946159 | 308 | netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n", |
f942dc25 | 309 | txp->offset, txp->size); |
e9ce7cb6 | 310 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 311 | return -EINVAL; |
f942dc25 | 312 | } |
59ccb4eb WL |
313 | |
314 | more_data = txp->flags & XEN_NETTXF_more_data; | |
315 | ||
316 | if (!drop_err) | |
317 | txp++; | |
318 | ||
319 | } while (more_data); | |
2810e5b9 WL |
320 | |
321 | if (drop_err) { | |
562abd39 | 322 | xenvif_tx_err(queue, first, extra_count, cons + slots); |
2810e5b9 WL |
323 | return drop_err; |
324 | } | |
325 | ||
326 | return slots; | |
f942dc25 IC |
327 | } |
328 | ||
8f13dd96 ZK |
329 | |
330 | struct xenvif_tx_cb { | |
ad7f402a RL |
331 | u16 copy_pending_idx[XEN_NETBK_LEGACY_SLOTS_MAX + 1]; |
332 | u8 copy_count; | |
05310f31 | 333 | u32 split_mask; |
8f13dd96 ZK |
334 | }; |
335 | ||
336 | #define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb) | |
ad7f402a RL |
337 | #define copy_pending_idx(skb, i) (XENVIF_TX_CB(skb)->copy_pending_idx[i]) |
338 | #define copy_count(skb) (XENVIF_TX_CB(skb)->copy_count) | |
8f13dd96 | 339 | |
e9ce7cb6 | 340 | static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue, |
562abd39 PD |
341 | u16 pending_idx, |
342 | struct xen_netif_tx_request *txp, | |
343 | unsigned int extra_count, | |
344 | struct gnttab_map_grant_ref *mop) | |
f53c3fe8 | 345 | { |
e9ce7cb6 WL |
346 | queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx]; |
347 | gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx), | |
f53c3fe8 | 348 | GNTMAP_host_map | GNTMAP_readonly, |
e9ce7cb6 | 349 | txp->gref, queue->vif->domid); |
f53c3fe8 | 350 | |
e9ce7cb6 | 351 | memcpy(&queue->pending_tx_info[pending_idx].req, txp, |
f53c3fe8 | 352 | sizeof(*txp)); |
562abd39 | 353 | queue->pending_tx_info[pending_idx].extra_count = extra_count; |
f53c3fe8 ZK |
354 | } |
355 | ||
e3377f36 ZK |
356 | static inline struct sk_buff *xenvif_alloc_skb(unsigned int size) |
357 | { | |
358 | struct sk_buff *skb = | |
359 | alloc_skb(size + NET_SKB_PAD + NET_IP_ALIGN, | |
360 | GFP_ATOMIC | __GFP_NOWARN); | |
05310f31 JG |
361 | |
362 | BUILD_BUG_ON(sizeof(*XENVIF_TX_CB(skb)) > sizeof(skb->cb)); | |
e3377f36 ZK |
363 | if (unlikely(skb == NULL)) |
364 | return NULL; | |
365 | ||
366 | /* Packets passed to netif_rx() must have some headroom. */ | |
367 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); | |
368 | ||
369 | /* Initialize it here to avoid later surprises */ | |
370 | skb_shinfo(skb)->destructor_arg = NULL; | |
371 | ||
372 | return skb; | |
373 | } | |
374 | ||
ad7f402a RL |
375 | static void xenvif_get_requests(struct xenvif_queue *queue, |
376 | struct sk_buff *skb, | |
377 | struct xen_netif_tx_request *first, | |
378 | struct xen_netif_tx_request *txfrags, | |
379 | unsigned *copy_ops, | |
380 | unsigned *map_ops, | |
381 | unsigned int frag_overflow, | |
382 | struct sk_buff *nskb, | |
383 | unsigned int extra_count, | |
384 | unsigned int data_len) | |
f942dc25 IC |
385 | { |
386 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
387 | skb_frag_t *frags = shinfo->frags; | |
ad7f402a | 388 | u16 pending_idx; |
62bad319 | 389 | pending_ring_idx_t index; |
2475b225 | 390 | unsigned int nr_slots; |
ad7f402a RL |
391 | struct gnttab_copy *cop = queue->tx_copy_ops + *copy_ops; |
392 | struct gnttab_map_grant_ref *gop = queue->tx_map_ops + *map_ops; | |
393 | struct xen_netif_tx_request *txp = first; | |
394 | ||
534fc31d | 395 | nr_slots = shinfo->nr_frags + frag_overflow + 1; |
ad7f402a RL |
396 | |
397 | copy_count(skb) = 0; | |
05310f31 | 398 | XENVIF_TX_CB(skb)->split_mask = 0; |
ad7f402a RL |
399 | |
400 | /* Create copy ops for exactly data_len bytes into the skb head. */ | |
401 | __skb_put(skb, data_len); | |
402 | while (data_len > 0) { | |
403 | int amount = data_len > txp->size ? txp->size : data_len; | |
05310f31 | 404 | bool split = false; |
ad7f402a RL |
405 | |
406 | cop->source.u.ref = txp->gref; | |
407 | cop->source.domid = queue->vif->domid; | |
408 | cop->source.offset = txp->offset; | |
409 | ||
410 | cop->dest.domid = DOMID_SELF; | |
411 | cop->dest.offset = (offset_in_page(skb->data + | |
412 | skb_headlen(skb) - | |
413 | data_len)) & ~XEN_PAGE_MASK; | |
414 | cop->dest.u.gmfn = virt_to_gfn(skb->data + skb_headlen(skb) | |
415 | - data_len); | |
416 | ||
05310f31 JG |
417 | /* Don't cross local page boundary! */ |
418 | if (cop->dest.offset + amount > XEN_PAGE_SIZE) { | |
419 | amount = XEN_PAGE_SIZE - cop->dest.offset; | |
420 | XENVIF_TX_CB(skb)->split_mask |= 1U << copy_count(skb); | |
421 | split = true; | |
422 | } | |
423 | ||
ad7f402a RL |
424 | cop->len = amount; |
425 | cop->flags = GNTCOPY_source_gref; | |
2810e5b9 | 426 | |
ad7f402a RL |
427 | index = pending_index(queue->pending_cons); |
428 | pending_idx = queue->pending_ring[index]; | |
429 | callback_param(queue, pending_idx).ctx = NULL; | |
430 | copy_pending_idx(skb, copy_count(skb)) = pending_idx; | |
05310f31 JG |
431 | if (!split) |
432 | copy_count(skb)++; | |
ad7f402a RL |
433 | |
434 | cop++; | |
435 | data_len -= amount; | |
f942dc25 | 436 | |
ad7f402a RL |
437 | if (amount == txp->size) { |
438 | /* The copy op covered the full tx_request */ | |
439 | ||
440 | memcpy(&queue->pending_tx_info[pending_idx].req, | |
441 | txp, sizeof(*txp)); | |
442 | queue->pending_tx_info[pending_idx].extra_count = | |
443 | (txp == first) ? extra_count : 0; | |
444 | ||
445 | if (txp == first) | |
446 | txp = txfrags; | |
447 | else | |
448 | txp++; | |
449 | queue->pending_cons++; | |
450 | nr_slots--; | |
451 | } else { | |
452 | /* The copy op partially covered the tx_request. | |
05310f31 JG |
453 | * The remainder will be mapped or copied in the next |
454 | * iteration. | |
ad7f402a RL |
455 | */ |
456 | txp->offset += amount; | |
457 | txp->size -= amount; | |
458 | } | |
459 | } | |
f942dc25 | 460 | |
534fc31d | 461 | for (shinfo->nr_frags = 0; nr_slots > 0 && shinfo->nr_frags < MAX_SKB_FRAGS; |
c7ec4f2d JB |
462 | nr_slots--) { |
463 | if (unlikely(!txp->size)) { | |
c7ec4f2d | 464 | make_tx_response(queue, txp, 0, XEN_NETIF_RSP_OKAY); |
c7ec4f2d JB |
465 | ++txp; |
466 | continue; | |
467 | } | |
468 | ||
e9ce7cb6 WL |
469 | index = pending_index(queue->pending_cons++); |
470 | pending_idx = queue->pending_ring[index]; | |
ad7f402a RL |
471 | xenvif_tx_create_map_op(queue, pending_idx, txp, |
472 | txp == first ? extra_count : 0, gop); | |
f53c3fe8 | 473 | frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx); |
c7ec4f2d JB |
474 | ++shinfo->nr_frags; |
475 | ++gop; | |
ad7f402a RL |
476 | |
477 | if (txp == first) | |
478 | txp = txfrags; | |
479 | else | |
480 | txp++; | |
f942dc25 IC |
481 | } |
482 | ||
534fc31d | 483 | if (nr_slots > 0) { |
e3377f36 ZK |
484 | |
485 | shinfo = skb_shinfo(nskb); | |
486 | frags = shinfo->frags; | |
487 | ||
c7ec4f2d JB |
488 | for (shinfo->nr_frags = 0; shinfo->nr_frags < nr_slots; ++txp) { |
489 | if (unlikely(!txp->size)) { | |
c7ec4f2d JB |
490 | make_tx_response(queue, txp, 0, |
491 | XEN_NETIF_RSP_OKAY); | |
c7ec4f2d JB |
492 | continue; |
493 | } | |
494 | ||
e9ce7cb6 WL |
495 | index = pending_index(queue->pending_cons++); |
496 | pending_idx = queue->pending_ring[index]; | |
562abd39 PD |
497 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, |
498 | gop); | |
e3377f36 ZK |
499 | frag_set_pending_idx(&frags[shinfo->nr_frags], |
500 | pending_idx); | |
c7ec4f2d JB |
501 | ++shinfo->nr_frags; |
502 | ++gop; | |
e3377f36 ZK |
503 | } |
504 | ||
c7ec4f2d JB |
505 | if (shinfo->nr_frags) { |
506 | skb_shinfo(skb)->frag_list = nskb; | |
507 | nskb = NULL; | |
508 | } | |
509 | } | |
510 | ||
511 | if (nskb) { | |
534fc31d | 512 | /* A frag_list skb was allocated but it is no longer needed |
c7ec4f2d JB |
513 | * because enough slots were converted to copy ops above or some |
514 | * were empty. | |
534fc31d RL |
515 | */ |
516 | kfree_skb(nskb); | |
e3377f36 | 517 | } |
2810e5b9 | 518 | |
ad7f402a RL |
519 | (*copy_ops) = cop - queue->tx_copy_ops; |
520 | (*map_ops) = gop - queue->tx_map_ops; | |
f942dc25 IC |
521 | } |
522 | ||
e9ce7cb6 | 523 | static inline void xenvif_grant_handle_set(struct xenvif_queue *queue, |
f53c3fe8 ZK |
524 | u16 pending_idx, |
525 | grant_handle_t handle) | |
526 | { | |
e9ce7cb6 | 527 | if (unlikely(queue->grant_tx_handle[pending_idx] != |
f53c3fe8 | 528 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 529 | netdev_err(queue->vif->dev, |
68946159 | 530 | "Trying to overwrite active handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
531 | pending_idx); |
532 | BUG(); | |
533 | } | |
e9ce7cb6 | 534 | queue->grant_tx_handle[pending_idx] = handle; |
f53c3fe8 ZK |
535 | } |
536 | ||
e9ce7cb6 | 537 | static inline void xenvif_grant_handle_reset(struct xenvif_queue *queue, |
f53c3fe8 ZK |
538 | u16 pending_idx) |
539 | { | |
e9ce7cb6 | 540 | if (unlikely(queue->grant_tx_handle[pending_idx] == |
f53c3fe8 | 541 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 542 | netdev_err(queue->vif->dev, |
68946159 | 543 | "Trying to unmap invalid handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
544 | pending_idx); |
545 | BUG(); | |
546 | } | |
e9ce7cb6 | 547 | queue->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE; |
f53c3fe8 ZK |
548 | } |
549 | ||
e9ce7cb6 | 550 | static int xenvif_tx_check_gop(struct xenvif_queue *queue, |
7376419a | 551 | struct sk_buff *skb, |
bdab8275 ZK |
552 | struct gnttab_map_grant_ref **gopp_map, |
553 | struct gnttab_copy **gopp_copy) | |
f942dc25 | 554 | { |
9074ce24 | 555 | struct gnttab_map_grant_ref *gop_map = *gopp_map; |
ad7f402a | 556 | u16 pending_idx; |
1a998d3e ZK |
557 | /* This always points to the shinfo of the skb being checked, which |
558 | * could be either the first or the one on the frag_list | |
559 | */ | |
f942dc25 | 560 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
1a998d3e ZK |
561 | /* If this is non-NULL, we are currently checking the frag_list skb, and |
562 | * this points to the shinfo of the first one | |
563 | */ | |
564 | struct skb_shared_info *first_shinfo = NULL; | |
f942dc25 | 565 | int nr_frags = shinfo->nr_frags; |
1b860da0 | 566 | const bool sharedslot = nr_frags && |
ad7f402a RL |
567 | frag_get_pending_idx(&shinfo->frags[0]) == |
568 | copy_pending_idx(skb, copy_count(skb) - 1); | |
7dfa764e | 569 | int i, err = 0; |
f942dc25 | 570 | |
ad7f402a RL |
571 | for (i = 0; i < copy_count(skb); i++) { |
572 | int newerr; | |
573 | ||
574 | /* Check status of header. */ | |
575 | pending_idx = copy_pending_idx(skb, i); | |
576 | ||
577 | newerr = (*gopp_copy)->status; | |
05310f31 JG |
578 | |
579 | /* Split copies need to be handled together. */ | |
580 | if (XENVIF_TX_CB(skb)->split_mask & (1U << i)) { | |
581 | (*gopp_copy)++; | |
582 | if (!newerr) | |
583 | newerr = (*gopp_copy)->status; | |
584 | } | |
ad7f402a RL |
585 | if (likely(!newerr)) { |
586 | /* The first frag might still have this slot mapped */ | |
587 | if (i < copy_count(skb) - 1 || !sharedslot) | |
588 | xenvif_idx_release(queue, pending_idx, | |
589 | XEN_NETIF_RSP_OKAY); | |
590 | } else { | |
591 | err = newerr; | |
592 | if (net_ratelimit()) | |
593 | netdev_dbg(queue->vif->dev, | |
594 | "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", | |
595 | (*gopp_copy)->status, | |
596 | pending_idx, | |
597 | (*gopp_copy)->source.u.ref); | |
598 | /* The first frag might still have this slot mapped */ | |
599 | if (i < copy_count(skb) - 1 || !sharedslot) | |
600 | xenvif_idx_release(queue, pending_idx, | |
601 | XEN_NETIF_RSP_ERROR); | |
602 | } | |
603 | (*gopp_copy)++; | |
bdab8275 | 604 | } |
f942dc25 | 605 | |
e3377f36 | 606 | check_frags: |
bdab8275 | 607 | for (i = 0; i < nr_frags; i++, gop_map++) { |
f942dc25 | 608 | int j, newerr; |
f942dc25 | 609 | |
ea066ad1 | 610 | pending_idx = frag_get_pending_idx(&shinfo->frags[i]); |
f942dc25 IC |
611 | |
612 | /* Check error status: if okay then remember grant handle. */ | |
bdab8275 | 613 | newerr = gop_map->status; |
2810e5b9 | 614 | |
f942dc25 | 615 | if (likely(!newerr)) { |
e9ce7cb6 | 616 | xenvif_grant_handle_set(queue, |
9074ce24 ZK |
617 | pending_idx, |
618 | gop_map->handle); | |
f942dc25 | 619 | /* Had a previous error? Invalidate this fragment. */ |
1b860da0 | 620 | if (unlikely(err)) { |
e9ce7cb6 | 621 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
622 | /* If the mapping of the first frag was OK, but |
623 | * the header's copy failed, and they are | |
624 | * sharing a slot, send an error | |
625 | */ | |
3ede7f84 | 626 | if (i == 0 && !first_shinfo && sharedslot) |
1b860da0 ZK |
627 | xenvif_idx_release(queue, pending_idx, |
628 | XEN_NETIF_RSP_ERROR); | |
629 | else | |
630 | xenvif_idx_release(queue, pending_idx, | |
631 | XEN_NETIF_RSP_OKAY); | |
632 | } | |
f942dc25 IC |
633 | continue; |
634 | } | |
635 | ||
636 | /* Error on this fragment: respond to client with an error. */ | |
bdab8275 | 637 | if (net_ratelimit()) |
e9ce7cb6 | 638 | netdev_dbg(queue->vif->dev, |
00aefceb | 639 | "Grant map of %d. frag failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
640 | i, |
641 | gop_map->status, | |
642 | pending_idx, | |
643 | gop_map->ref); | |
1b860da0 | 644 | |
e9ce7cb6 | 645 | xenvif_idx_release(queue, pending_idx, XEN_NETIF_RSP_ERROR); |
f942dc25 IC |
646 | |
647 | /* Not the first error? Preceding frags already invalidated. */ | |
648 | if (err) | |
649 | continue; | |
1b860da0 | 650 | |
1b860da0 | 651 | /* Invalidate preceding fragments of this skb. */ |
bdab8275 | 652 | for (j = 0; j < i; j++) { |
5ccb3ea7 | 653 | pending_idx = frag_get_pending_idx(&shinfo->frags[j]); |
e9ce7cb6 | 654 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
655 | xenvif_idx_release(queue, pending_idx, |
656 | XEN_NETIF_RSP_OKAY); | |
f942dc25 IC |
657 | } |
658 | ||
1a998d3e ZK |
659 | /* And if we found the error while checking the frag_list, unmap |
660 | * the first skb's frags | |
661 | */ | |
662 | if (first_shinfo) { | |
663 | for (j = 0; j < first_shinfo->nr_frags; j++) { | |
664 | pending_idx = frag_get_pending_idx(&first_shinfo->frags[j]); | |
665 | xenvif_idx_unmap(queue, pending_idx); | |
1b860da0 ZK |
666 | xenvif_idx_release(queue, pending_idx, |
667 | XEN_NETIF_RSP_OKAY); | |
1a998d3e | 668 | } |
f942dc25 IC |
669 | } |
670 | ||
671 | /* Remember the error: invalidate all subsequent fragments. */ | |
672 | err = newerr; | |
673 | } | |
674 | ||
1a998d3e | 675 | if (skb_has_frag_list(skb) && !first_shinfo) { |
826d8217 JB |
676 | first_shinfo = shinfo; |
677 | shinfo = skb_shinfo(shinfo->frag_list); | |
e3377f36 | 678 | nr_frags = shinfo->nr_frags; |
e3377f36 ZK |
679 | |
680 | goto check_frags; | |
681 | } | |
682 | ||
bdab8275 | 683 | *gopp_map = gop_map; |
f942dc25 IC |
684 | return err; |
685 | } | |
686 | ||
e9ce7cb6 | 687 | static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb) |
f942dc25 IC |
688 | { |
689 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
690 | int nr_frags = shinfo->nr_frags; | |
691 | int i; | |
f53c3fe8 ZK |
692 | u16 prev_pending_idx = INVALID_PENDING_IDX; |
693 | ||
f942dc25 IC |
694 | for (i = 0; i < nr_frags; i++) { |
695 | skb_frag_t *frag = shinfo->frags + i; | |
696 | struct xen_netif_tx_request *txp; | |
ea066ad1 IC |
697 | struct page *page; |
698 | u16 pending_idx; | |
f942dc25 | 699 | |
ea066ad1 | 700 | pending_idx = frag_get_pending_idx(frag); |
f942dc25 | 701 | |
f53c3fe8 | 702 | /* If this is not the first frag, chain it to the previous*/ |
bdab8275 | 703 | if (prev_pending_idx == INVALID_PENDING_IDX) |
f53c3fe8 | 704 | skb_shinfo(skb)->destructor_arg = |
e9ce7cb6 | 705 | &callback_param(queue, pending_idx); |
bdab8275 | 706 | else |
e9ce7cb6 WL |
707 | callback_param(queue, prev_pending_idx).ctx = |
708 | &callback_param(queue, pending_idx); | |
f53c3fe8 | 709 | |
e9ce7cb6 | 710 | callback_param(queue, pending_idx).ctx = NULL; |
f53c3fe8 ZK |
711 | prev_pending_idx = pending_idx; |
712 | ||
e9ce7cb6 | 713 | txp = &queue->pending_tx_info[pending_idx].req; |
e36bfc0b | 714 | page = virt_to_page((void *)idx_to_kaddr(queue, pending_idx)); |
ea066ad1 | 715 | __skb_fill_page_desc(skb, i, page, txp->offset, txp->size); |
f942dc25 IC |
716 | skb->len += txp->size; |
717 | skb->data_len += txp->size; | |
718 | skb->truesize += txp->size; | |
719 | ||
f53c3fe8 | 720 | /* Take an extra reference to offset network stack's put_page */ |
e9ce7cb6 | 721 | get_page(queue->mmap_pages[pending_idx]); |
f942dc25 IC |
722 | } |
723 | } | |
724 | ||
e9ce7cb6 | 725 | static int xenvif_get_extras(struct xenvif_queue *queue, |
562abd39 PD |
726 | struct xen_netif_extra_info *extras, |
727 | unsigned int *extra_count, | |
728 | int work_to_do) | |
f942dc25 IC |
729 | { |
730 | struct xen_netif_extra_info extra; | |
e9ce7cb6 | 731 | RING_IDX cons = queue->tx.req_cons; |
f942dc25 IC |
732 | |
733 | do { | |
734 | if (unlikely(work_to_do-- <= 0)) { | |
e9ce7cb6 WL |
735 | netdev_err(queue->vif->dev, "Missing extra info\n"); |
736 | xenvif_fatal_tx_err(queue->vif); | |
f942dc25 IC |
737 | return -EBADR; |
738 | } | |
739 | ||
68a33bfd | 740 | RING_COPY_REQUEST(&queue->tx, cons, &extra); |
562abd39 PD |
741 | |
742 | queue->tx.req_cons = ++cons; | |
743 | (*extra_count)++; | |
744 | ||
f942dc25 IC |
745 | if (unlikely(!extra.type || |
746 | extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
e9ce7cb6 | 747 | netdev_err(queue->vif->dev, |
f942dc25 | 748 | "Invalid extra type: %d\n", extra.type); |
e9ce7cb6 | 749 | xenvif_fatal_tx_err(queue->vif); |
f942dc25 IC |
750 | return -EINVAL; |
751 | } | |
752 | ||
753 | memcpy(&extras[extra.type - 1], &extra, sizeof(extra)); | |
f942dc25 IC |
754 | } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
755 | ||
756 | return work_to_do; | |
757 | } | |
758 | ||
7376419a WL |
759 | static int xenvif_set_skb_gso(struct xenvif *vif, |
760 | struct sk_buff *skb, | |
761 | struct xen_netif_extra_info *gso) | |
f942dc25 IC |
762 | { |
763 | if (!gso->u.gso.size) { | |
48856286 | 764 | netdev_err(vif->dev, "GSO size must not be zero.\n"); |
7376419a | 765 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
766 | return -EINVAL; |
767 | } | |
768 | ||
a9468587 PD |
769 | switch (gso->u.gso.type) { |
770 | case XEN_NETIF_GSO_TYPE_TCPV4: | |
771 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
772 | break; | |
773 | case XEN_NETIF_GSO_TYPE_TCPV6: | |
774 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
775 | break; | |
776 | default: | |
48856286 | 777 | netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type); |
7376419a | 778 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
779 | return -EINVAL; |
780 | } | |
781 | ||
782 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
b89587a7 | 783 | /* gso_segs will be calculated later */ |
f942dc25 IC |
784 | |
785 | return 0; | |
786 | } | |
787 | ||
e9ce7cb6 | 788 | static int checksum_setup(struct xenvif_queue *queue, struct sk_buff *skb) |
2eba61d5 | 789 | { |
2721637c | 790 | bool recalculate_partial_csum = false; |
2eba61d5 PD |
791 | |
792 | /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
793 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
794 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
795 | * recalculate the partial checksum. | |
796 | */ | |
797 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
e9ce7cb6 | 798 | queue->stats.rx_gso_checksum_fixup++; |
2eba61d5 | 799 | skb->ip_summed = CHECKSUM_PARTIAL; |
2721637c | 800 | recalculate_partial_csum = true; |
2eba61d5 PD |
801 | } |
802 | ||
803 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
804 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
805 | return 0; | |
806 | ||
2721637c | 807 | return skb_checksum_setup(skb, recalculate_partial_csum); |
2eba61d5 PD |
808 | } |
809 | ||
e9ce7cb6 | 810 | static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) |
f942dc25 | 811 | { |
059dfa6a | 812 | u64 now = get_jiffies_64(); |
e9ce7cb6 WL |
813 | u64 next_credit = queue->credit_window_start + |
814 | msecs_to_jiffies(queue->credit_usec / 1000); | |
f942dc25 IC |
815 | |
816 | /* Timer could already be pending in rare cases. */ | |
dfa523ae WL |
817 | if (timer_pending(&queue->credit_timeout)) { |
818 | queue->rate_limited = true; | |
f942dc25 | 819 | return true; |
dfa523ae | 820 | } |
f942dc25 IC |
821 | |
822 | /* Passed the point where we can replenish credit? */ | |
059dfa6a | 823 | if (time_after_eq64(now, next_credit)) { |
e9ce7cb6 WL |
824 | queue->credit_window_start = now; |
825 | tx_add_credit(queue); | |
f942dc25 IC |
826 | } |
827 | ||
828 | /* Still too big to send right now? Set a callback. */ | |
e9ce7cb6 | 829 | if (size > queue->remaining_credit) { |
e9ce7cb6 | 830 | mod_timer(&queue->credit_timeout, |
f942dc25 | 831 | next_credit); |
e9ce7cb6 | 832 | queue->credit_window_start = next_credit; |
dfa523ae | 833 | queue->rate_limited = true; |
f942dc25 IC |
834 | |
835 | return true; | |
836 | } | |
837 | ||
838 | return false; | |
839 | } | |
840 | ||
210c34dc PD |
841 | /* No locking is required in xenvif_mcast_add/del() as they are |
842 | * only ever invoked from NAPI poll. An RCU list is used because | |
843 | * xenvif_mcast_match() is called asynchronously, during start_xmit. | |
844 | */ | |
845 | ||
846 | static int xenvif_mcast_add(struct xenvif *vif, const u8 *addr) | |
847 | { | |
848 | struct xenvif_mcast_addr *mcast; | |
849 | ||
850 | if (vif->fe_mcast_count == XEN_NETBK_MCAST_MAX) { | |
851 | if (net_ratelimit()) | |
852 | netdev_err(vif->dev, | |
853 | "Too many multicast addresses\n"); | |
854 | return -ENOSPC; | |
855 | } | |
856 | ||
857 | mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC); | |
858 | if (!mcast) | |
859 | return -ENOMEM; | |
860 | ||
861 | ether_addr_copy(mcast->addr, addr); | |
862 | list_add_tail_rcu(&mcast->entry, &vif->fe_mcast_addr); | |
863 | vif->fe_mcast_count++; | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | static void xenvif_mcast_del(struct xenvif *vif, const u8 *addr) | |
869 | { | |
870 | struct xenvif_mcast_addr *mcast; | |
871 | ||
872 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
873 | if (ether_addr_equal(addr, mcast->addr)) { | |
874 | --vif->fe_mcast_count; | |
875 | list_del_rcu(&mcast->entry); | |
876 | kfree_rcu(mcast, rcu); | |
877 | break; | |
878 | } | |
879 | } | |
880 | } | |
881 | ||
882 | bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr) | |
883 | { | |
884 | struct xenvif_mcast_addr *mcast; | |
885 | ||
886 | rcu_read_lock(); | |
887 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
888 | if (ether_addr_equal(addr, mcast->addr)) { | |
889 | rcu_read_unlock(); | |
890 | return true; | |
891 | } | |
892 | } | |
893 | rcu_read_unlock(); | |
894 | ||
895 | return false; | |
896 | } | |
897 | ||
898 | void xenvif_mcast_addr_list_free(struct xenvif *vif) | |
899 | { | |
900 | /* No need for locking or RCU here. NAPI poll and TX queue | |
901 | * are stopped. | |
902 | */ | |
903 | while (!list_empty(&vif->fe_mcast_addr)) { | |
904 | struct xenvif_mcast_addr *mcast; | |
905 | ||
906 | mcast = list_first_entry(&vif->fe_mcast_addr, | |
907 | struct xenvif_mcast_addr, | |
908 | entry); | |
909 | --vif->fe_mcast_count; | |
910 | list_del(&mcast->entry); | |
911 | kfree(mcast); | |
912 | } | |
913 | } | |
914 | ||
e9ce7cb6 | 915 | static void xenvif_tx_build_gops(struct xenvif_queue *queue, |
bdab8275 ZK |
916 | int budget, |
917 | unsigned *copy_ops, | |
918 | unsigned *map_ops) | |
f942dc25 | 919 | { |
2475b225 | 920 | struct sk_buff *skb, *nskb; |
f942dc25 | 921 | int ret; |
2475b225 | 922 | unsigned int frag_overflow; |
f942dc25 | 923 | |
e9ce7cb6 | 924 | while (skb_queue_len(&queue->tx_queue) < budget) { |
f942dc25 | 925 | struct xen_netif_tx_request txreq; |
37641494 | 926 | struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX]; |
f942dc25 | 927 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1]; |
562abd39 | 928 | unsigned int extra_count; |
f942dc25 IC |
929 | RING_IDX idx; |
930 | int work_to_do; | |
931 | unsigned int data_len; | |
f942dc25 | 932 | |
e9ce7cb6 | 933 | if (queue->tx.sring->req_prod - queue->tx.req_cons > |
48856286 | 934 | XEN_NETIF_TX_RING_SIZE) { |
e9ce7cb6 | 935 | netdev_err(queue->vif->dev, |
48856286 IC |
936 | "Impossible number of requests. " |
937 | "req_prod %d, req_cons %d, size %ld\n", | |
e9ce7cb6 | 938 | queue->tx.sring->req_prod, queue->tx.req_cons, |
48856286 | 939 | XEN_NETIF_TX_RING_SIZE); |
e9ce7cb6 | 940 | xenvif_fatal_tx_err(queue->vif); |
e9d8b2c2 | 941 | break; |
48856286 IC |
942 | } |
943 | ||
09e545f7 | 944 | work_to_do = XEN_RING_NR_UNCONSUMED_REQUESTS(&queue->tx); |
b3f980bd WL |
945 | if (!work_to_do) |
946 | break; | |
f942dc25 | 947 | |
e9ce7cb6 | 948 | idx = queue->tx.req_cons; |
f942dc25 | 949 | rmb(); /* Ensure that we see the request before we copy it. */ |
68a33bfd | 950 | RING_COPY_REQUEST(&queue->tx, idx, &txreq); |
f942dc25 IC |
951 | |
952 | /* Credit-based scheduling. */ | |
e9ce7cb6 WL |
953 | if (txreq.size > queue->remaining_credit && |
954 | tx_credit_exceeded(queue, txreq.size)) | |
b3f980bd | 955 | break; |
f942dc25 | 956 | |
e9ce7cb6 | 957 | queue->remaining_credit -= txreq.size; |
f942dc25 IC |
958 | |
959 | work_to_do--; | |
e9ce7cb6 | 960 | queue->tx.req_cons = ++idx; |
f942dc25 IC |
961 | |
962 | memset(extras, 0, sizeof(extras)); | |
562abd39 | 963 | extra_count = 0; |
f942dc25 | 964 | if (txreq.flags & XEN_NETTXF_extra_info) { |
e9ce7cb6 | 965 | work_to_do = xenvif_get_extras(queue, extras, |
562abd39 | 966 | &extra_count, |
7376419a | 967 | work_to_do); |
e9ce7cb6 | 968 | idx = queue->tx.req_cons; |
48856286 | 969 | if (unlikely(work_to_do < 0)) |
b3f980bd | 970 | break; |
f942dc25 IC |
971 | } |
972 | ||
210c34dc PD |
973 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1].type) { |
974 | struct xen_netif_extra_info *extra; | |
975 | ||
976 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1]; | |
977 | ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr); | |
978 | ||
562abd39 | 979 | make_tx_response(queue, &txreq, extra_count, |
210c34dc PD |
980 | (ret == 0) ? |
981 | XEN_NETIF_RSP_OKAY : | |
982 | XEN_NETIF_RSP_ERROR); | |
210c34dc PD |
983 | continue; |
984 | } | |
985 | ||
986 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1].type) { | |
987 | struct xen_netif_extra_info *extra; | |
988 | ||
989 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1]; | |
990 | xenvif_mcast_del(queue->vif, extra->u.mcast.addr); | |
991 | ||
562abd39 PD |
992 | make_tx_response(queue, &txreq, extra_count, |
993 | XEN_NETIF_RSP_OKAY); | |
210c34dc PD |
994 | continue; |
995 | } | |
996 | ||
ad7f402a RL |
997 | data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN) ? |
998 | XEN_NETBACK_TX_COPY_LEN : txreq.size; | |
999 | ||
562abd39 PD |
1000 | ret = xenvif_count_requests(queue, &txreq, extra_count, |
1001 | txfrags, work_to_do); | |
ad7f402a | 1002 | |
48856286 | 1003 | if (unlikely(ret < 0)) |
b3f980bd | 1004 | break; |
48856286 | 1005 | |
f942dc25 IC |
1006 | idx += ret; |
1007 | ||
1008 | if (unlikely(txreq.size < ETH_HLEN)) { | |
e9ce7cb6 | 1009 | netdev_dbg(queue->vif->dev, |
f942dc25 | 1010 | "Bad packet size: %d\n", txreq.size); |
562abd39 | 1011 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
b3f980bd | 1012 | break; |
f942dc25 IC |
1013 | } |
1014 | ||
1015 | /* No crossing a page as the payload mustn't fragment. */ | |
d0089e8a | 1016 | if (unlikely((txreq.offset + txreq.size) > XEN_PAGE_SIZE)) { |
2eca98e5 JG |
1017 | netdev_err(queue->vif->dev, "Cross page boundary, txreq.offset: %u, size: %u\n", |
1018 | txreq.offset, txreq.size); | |
e9ce7cb6 | 1019 | xenvif_fatal_tx_err(queue->vif); |
b3f980bd | 1020 | break; |
f942dc25 IC |
1021 | } |
1022 | ||
ad7f402a RL |
1023 | if (ret >= XEN_NETBK_LEGACY_SLOTS_MAX - 1 && data_len < txreq.size) |
1024 | data_len = txreq.size; | |
f942dc25 | 1025 | |
e3377f36 | 1026 | skb = xenvif_alloc_skb(data_len); |
f942dc25 | 1027 | if (unlikely(skb == NULL)) { |
e9ce7cb6 | 1028 | netdev_dbg(queue->vif->dev, |
f942dc25 | 1029 | "Can't allocate a skb in start_xmit.\n"); |
562abd39 | 1030 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
f942dc25 IC |
1031 | break; |
1032 | } | |
1033 | ||
2475b225 | 1034 | skb_shinfo(skb)->nr_frags = ret; |
2475b225 RL |
1035 | /* At this point shinfo->nr_frags is in fact the number of |
1036 | * slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX. | |
1037 | */ | |
1038 | frag_overflow = 0; | |
1039 | nskb = NULL; | |
1040 | if (skb_shinfo(skb)->nr_frags > MAX_SKB_FRAGS) { | |
1041 | frag_overflow = skb_shinfo(skb)->nr_frags - MAX_SKB_FRAGS; | |
1042 | BUG_ON(frag_overflow > MAX_SKB_FRAGS); | |
1043 | skb_shinfo(skb)->nr_frags = MAX_SKB_FRAGS; | |
1044 | nskb = xenvif_alloc_skb(0); | |
1045 | if (unlikely(nskb == NULL)) { | |
3a0233dd | 1046 | skb_shinfo(skb)->nr_frags = 0; |
2475b225 | 1047 | kfree_skb(skb); |
562abd39 | 1048 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
2475b225 RL |
1049 | if (net_ratelimit()) |
1050 | netdev_err(queue->vif->dev, | |
1051 | "Can't allocate the frag_list skb.\n"); | |
1052 | break; | |
1053 | } | |
1054 | } | |
1055 | ||
f942dc25 IC |
1056 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
1057 | struct xen_netif_extra_info *gso; | |
1058 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1059 | ||
e9ce7cb6 | 1060 | if (xenvif_set_skb_gso(queue->vif, skb, gso)) { |
7376419a | 1061 | /* Failure in xenvif_set_skb_gso is fatal. */ |
3a0233dd | 1062 | skb_shinfo(skb)->nr_frags = 0; |
f942dc25 | 1063 | kfree_skb(skb); |
2475b225 | 1064 | kfree_skb(nskb); |
b3f980bd | 1065 | break; |
f942dc25 IC |
1066 | } |
1067 | } | |
1068 | ||
c2d09fde PD |
1069 | if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type) { |
1070 | struct xen_netif_extra_info *extra; | |
1071 | enum pkt_hash_types type = PKT_HASH_TYPE_NONE; | |
1072 | ||
1073 | extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1]; | |
1074 | ||
1075 | switch (extra->u.hash.type) { | |
1076 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4: | |
1077 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6: | |
1078 | type = PKT_HASH_TYPE_L3; | |
1079 | break; | |
1080 | ||
1081 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP: | |
1082 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP: | |
1083 | type = PKT_HASH_TYPE_L4; | |
1084 | break; | |
1085 | ||
1086 | default: | |
1087 | break; | |
1088 | } | |
1089 | ||
1090 | if (type != PKT_HASH_TYPE_NONE) | |
1091 | skb_set_hash(skb, | |
1092 | *(u32 *)extra->u.hash.value, | |
1093 | type); | |
1094 | } | |
1095 | ||
ad7f402a RL |
1096 | xenvif_get_requests(queue, skb, &txreq, txfrags, copy_ops, |
1097 | map_ops, frag_overflow, nskb, extra_count, | |
1098 | data_len); | |
f942dc25 | 1099 | |
e9ce7cb6 | 1100 | __skb_queue_tail(&queue->tx_queue, skb); |
1e0b6eac | 1101 | |
e9ce7cb6 | 1102 | queue->tx.req_cons = idx; |
f942dc25 IC |
1103 | } |
1104 | ||
bdab8275 | 1105 | return; |
f942dc25 IC |
1106 | } |
1107 | ||
e3377f36 ZK |
1108 | /* Consolidate skb with a frag_list into a brand new one with local pages on |
1109 | * frags. Returns 0 or -ENOMEM if can't allocate new pages. | |
1110 | */ | |
e9ce7cb6 | 1111 | static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *skb) |
e3377f36 ZK |
1112 | { |
1113 | unsigned int offset = skb_headlen(skb); | |
1114 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
49d9991a | 1115 | int i, f; |
e3377f36 ZK |
1116 | struct ubuf_info *uarg; |
1117 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; | |
1118 | ||
e9ce7cb6 WL |
1119 | queue->stats.tx_zerocopy_sent += 2; |
1120 | queue->stats.tx_frag_overflow++; | |
e3377f36 | 1121 | |
e9ce7cb6 | 1122 | xenvif_fill_frags(queue, nskb); |
e3377f36 ZK |
1123 | /* Subtract frags size, we will correct it later */ |
1124 | skb->truesize -= skb->data_len; | |
1125 | skb->len += nskb->len; | |
1126 | skb->data_len += nskb->len; | |
1127 | ||
1128 | /* create a brand new frags array and coalesce there */ | |
1129 | for (i = 0; offset < skb->len; i++) { | |
1130 | struct page *page; | |
1131 | unsigned int len; | |
1132 | ||
1133 | BUG_ON(i >= MAX_SKB_FRAGS); | |
44cc8ed1 | 1134 | page = alloc_page(GFP_ATOMIC); |
e3377f36 ZK |
1135 | if (!page) { |
1136 | int j; | |
1137 | skb->truesize += skb->data_len; | |
1138 | for (j = 0; j < i; j++) | |
d7840976 | 1139 | put_page(skb_frag_page(&frags[j])); |
e3377f36 ZK |
1140 | return -ENOMEM; |
1141 | } | |
1142 | ||
1143 | if (offset + PAGE_SIZE < skb->len) | |
1144 | len = PAGE_SIZE; | |
1145 | else | |
1146 | len = skb->len - offset; | |
1147 | if (skb_copy_bits(skb, offset, page_address(page), len)) | |
1148 | BUG(); | |
1149 | ||
1150 | offset += len; | |
b51f4113 | 1151 | skb_frag_fill_page_desc(&frags[i], page, 0, len); |
e3377f36 | 1152 | } |
49d9991a DV |
1153 | |
1154 | /* Release all the original (foreign) frags. */ | |
1155 | for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) | |
1156 | skb_frag_unref(skb, f); | |
e3377f36 | 1157 | uarg = skb_shinfo(skb)->destructor_arg; |
a64bd934 WL |
1158 | /* increase inflight counter to offset decrement in callback */ |
1159 | atomic_inc(&queue->inflight_packets); | |
7ab4f16f | 1160 | uarg->ops->complete(NULL, uarg, true); |
e3377f36 ZK |
1161 | skb_shinfo(skb)->destructor_arg = NULL; |
1162 | ||
b0c21bad DV |
1163 | /* Fill the skb with the new (local) frags. */ |
1164 | memcpy(skb_shinfo(skb)->frags, frags, i * sizeof(skb_frag_t)); | |
1165 | skb_shinfo(skb)->nr_frags = i; | |
1166 | skb->truesize += i * PAGE_SIZE; | |
e3377f36 ZK |
1167 | |
1168 | return 0; | |
1169 | } | |
b3f980bd | 1170 | |
e9ce7cb6 | 1171 | static int xenvif_tx_submit(struct xenvif_queue *queue) |
f942dc25 | 1172 | { |
e9ce7cb6 WL |
1173 | struct gnttab_map_grant_ref *gop_map = queue->tx_map_ops; |
1174 | struct gnttab_copy *gop_copy = queue->tx_copy_ops; | |
f942dc25 | 1175 | struct sk_buff *skb; |
b3f980bd | 1176 | int work_done = 0; |
f942dc25 | 1177 | |
e9ce7cb6 | 1178 | while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) { |
f942dc25 | 1179 | struct xen_netif_tx_request *txp; |
f942dc25 | 1180 | u16 pending_idx; |
f942dc25 | 1181 | |
ad7f402a | 1182 | pending_idx = copy_pending_idx(skb, 0); |
e9ce7cb6 | 1183 | txp = &queue->pending_tx_info[pending_idx].req; |
f942dc25 IC |
1184 | |
1185 | /* Check the remap error code. */ | |
e9ce7cb6 | 1186 | if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) { |
b42cc6e4 ZK |
1187 | /* If there was an error, xenvif_tx_check_gop is |
1188 | * expected to release all the frags which were mapped, | |
1189 | * so kfree_skb shouldn't do it again | |
1190 | */ | |
f942dc25 | 1191 | skb_shinfo(skb)->nr_frags = 0; |
b42cc6e4 ZK |
1192 | if (skb_has_frag_list(skb)) { |
1193 | struct sk_buff *nskb = | |
1194 | skb_shinfo(skb)->frag_list; | |
1195 | skb_shinfo(nskb)->nr_frags = 0; | |
1196 | } | |
f942dc25 IC |
1197 | kfree_skb(skb); |
1198 | continue; | |
1199 | } | |
1200 | ||
f942dc25 IC |
1201 | if (txp->flags & XEN_NETTXF_csum_blank) |
1202 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1203 | else if (txp->flags & XEN_NETTXF_data_validated) | |
1204 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1205 | ||
e9ce7cb6 | 1206 | xenvif_fill_frags(queue, skb); |
f942dc25 | 1207 | |
e3377f36 | 1208 | if (unlikely(skb_has_frag_list(skb))) { |
99e87f56 ID |
1209 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; |
1210 | xenvif_skb_zerocopy_prepare(queue, nskb); | |
e9ce7cb6 | 1211 | if (xenvif_handle_frag_list(queue, skb)) { |
e3377f36 | 1212 | if (net_ratelimit()) |
e9ce7cb6 | 1213 | netdev_err(queue->vif->dev, |
e3377f36 | 1214 | "Not enough memory to consolidate frag_list!\n"); |
a64bd934 | 1215 | xenvif_skb_zerocopy_prepare(queue, skb); |
e3377f36 ZK |
1216 | kfree_skb(skb); |
1217 | continue; | |
1218 | } | |
99e87f56 ID |
1219 | /* Copied all the bits from the frag list -- free it. */ |
1220 | skb_frag_list_init(skb); | |
1221 | kfree_skb(nskb); | |
e3377f36 ZK |
1222 | } |
1223 | ||
e9ce7cb6 | 1224 | skb->dev = queue->vif->dev; |
f942dc25 | 1225 | skb->protocol = eth_type_trans(skb, skb->dev); |
f9ca8f74 | 1226 | skb_reset_network_header(skb); |
f942dc25 | 1227 | |
e9ce7cb6 WL |
1228 | if (checksum_setup(queue, skb)) { |
1229 | netdev_dbg(queue->vif->dev, | |
f942dc25 | 1230 | "Can't setup checksum in net_tx_action\n"); |
f53c3fe8 ZK |
1231 | /* We have to set this flag to trigger the callback */ |
1232 | if (skb_shinfo(skb)->destructor_arg) | |
a64bd934 | 1233 | xenvif_skb_zerocopy_prepare(queue, skb); |
f942dc25 IC |
1234 | kfree_skb(skb); |
1235 | continue; | |
1236 | } | |
1237 | ||
d2aa125d | 1238 | skb_probe_transport_header(skb); |
f9ca8f74 | 1239 | |
b89587a7 PD |
1240 | /* If the packet is GSO then we will have just set up the |
1241 | * transport header offset in checksum_setup so it's now | |
1242 | * straightforward to calculate gso_segs. | |
1243 | */ | |
1244 | if (skb_is_gso(skb)) { | |
d2aa125d MM |
1245 | int mss, hdrlen; |
1246 | ||
1247 | /* GSO implies having the L4 header. */ | |
1248 | WARN_ON_ONCE(!skb_transport_header_was_set(skb)); | |
1249 | if (unlikely(!skb_transport_header_was_set(skb))) { | |
1250 | kfree_skb(skb); | |
1251 | continue; | |
1252 | } | |
1253 | ||
1254 | mss = skb_shinfo(skb)->gso_size; | |
504148fe | 1255 | hdrlen = skb_tcp_all_headers(skb); |
b89587a7 PD |
1256 | |
1257 | skb_shinfo(skb)->gso_segs = | |
1258 | DIV_ROUND_UP(skb->len - hdrlen, mss); | |
1259 | } | |
1260 | ||
e9ce7cb6 WL |
1261 | queue->stats.rx_bytes += skb->len; |
1262 | queue->stats.rx_packets++; | |
f942dc25 | 1263 | |
b3f980bd WL |
1264 | work_done++; |
1265 | ||
f53c3fe8 ZK |
1266 | /* Set this flag right before netif_receive_skb, otherwise |
1267 | * someone might think this packet already left netback, and | |
1268 | * do a skb_copy_ubufs while we are still in control of the | |
1269 | * skb. E.g. the __pskb_pull_tail earlier can do such thing. | |
1270 | */ | |
1bb332af | 1271 | if (skb_shinfo(skb)->destructor_arg) { |
a64bd934 | 1272 | xenvif_skb_zerocopy_prepare(queue, skb); |
e9ce7cb6 | 1273 | queue->stats.tx_zerocopy_sent++; |
1bb332af | 1274 | } |
f53c3fe8 | 1275 | |
b3f980bd | 1276 | netif_receive_skb(skb); |
f942dc25 | 1277 | } |
b3f980bd WL |
1278 | |
1279 | return work_done; | |
f942dc25 IC |
1280 | } |
1281 | ||
7ab4f16f PB |
1282 | static void xenvif_zerocopy_callback(struct sk_buff *skb, |
1283 | struct ubuf_info *ubuf_base, | |
1284 | bool zerocopy_success) | |
3e2234b3 | 1285 | { |
f53c3fe8 ZK |
1286 | unsigned long flags; |
1287 | pending_ring_idx_t index; | |
b63ca3e8 | 1288 | struct ubuf_info_msgzc *ubuf = uarg_to_msgzc(ubuf_base); |
e9ce7cb6 | 1289 | struct xenvif_queue *queue = ubuf_to_queue(ubuf); |
f53c3fe8 ZK |
1290 | |
1291 | /* This is the only place where we grab this lock, to protect callbacks | |
1292 | * from each other. | |
1293 | */ | |
e9ce7cb6 | 1294 | spin_lock_irqsave(&queue->callback_lock, flags); |
f53c3fe8 ZK |
1295 | do { |
1296 | u16 pending_idx = ubuf->desc; | |
b63ca3e8 | 1297 | ubuf = (struct ubuf_info_msgzc *) ubuf->ctx; |
e9ce7cb6 | 1298 | BUG_ON(queue->dealloc_prod - queue->dealloc_cons >= |
f53c3fe8 | 1299 | MAX_PENDING_REQS); |
e9ce7cb6 WL |
1300 | index = pending_index(queue->dealloc_prod); |
1301 | queue->dealloc_ring[index] = pending_idx; | |
f53c3fe8 ZK |
1302 | /* Sync with xenvif_tx_dealloc_action: |
1303 | * insert idx then incr producer. | |
1304 | */ | |
1305 | smp_wmb(); | |
e9ce7cb6 | 1306 | queue->dealloc_prod++; |
f53c3fe8 | 1307 | } while (ubuf); |
e9ce7cb6 | 1308 | spin_unlock_irqrestore(&queue->callback_lock, flags); |
f53c3fe8 | 1309 | |
1bb332af | 1310 | if (likely(zerocopy_success)) |
e9ce7cb6 | 1311 | queue->stats.tx_zerocopy_success++; |
1bb332af | 1312 | else |
e9ce7cb6 | 1313 | queue->stats.tx_zerocopy_fail++; |
a64bd934 | 1314 | xenvif_skb_zerocopy_complete(queue); |
f53c3fe8 ZK |
1315 | } |
1316 | ||
7ab4f16f PB |
1317 | const struct ubuf_info_ops xenvif_ubuf_ops = { |
1318 | .complete = xenvif_zerocopy_callback, | |
1319 | }; | |
1320 | ||
e9ce7cb6 | 1321 | static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue) |
f53c3fe8 ZK |
1322 | { |
1323 | struct gnttab_unmap_grant_ref *gop; | |
1324 | pending_ring_idx_t dc, dp; | |
1325 | u16 pending_idx, pending_idx_release[MAX_PENDING_REQS]; | |
1326 | unsigned int i = 0; | |
1327 | ||
e9ce7cb6 WL |
1328 | dc = queue->dealloc_cons; |
1329 | gop = queue->tx_unmap_ops; | |
f53c3fe8 ZK |
1330 | |
1331 | /* Free up any grants we have finished using */ | |
1332 | do { | |
e9ce7cb6 | 1333 | dp = queue->dealloc_prod; |
f53c3fe8 ZK |
1334 | |
1335 | /* Ensure we see all indices enqueued by all | |
1336 | * xenvif_zerocopy_callback(). | |
1337 | */ | |
1338 | smp_rmb(); | |
1339 | ||
1340 | while (dc != dp) { | |
50c2e4dd | 1341 | BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS); |
f53c3fe8 | 1342 | pending_idx = |
e9ce7cb6 | 1343 | queue->dealloc_ring[pending_index(dc++)]; |
f53c3fe8 | 1344 | |
50c2e4dd | 1345 | pending_idx_release[gop - queue->tx_unmap_ops] = |
f53c3fe8 | 1346 | pending_idx; |
50c2e4dd | 1347 | queue->pages_to_unmap[gop - queue->tx_unmap_ops] = |
e9ce7cb6 | 1348 | queue->mmap_pages[pending_idx]; |
f53c3fe8 | 1349 | gnttab_set_unmap_op(gop, |
e9ce7cb6 | 1350 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1351 | GNTMAP_host_map, |
e9ce7cb6 WL |
1352 | queue->grant_tx_handle[pending_idx]); |
1353 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1354 | ++gop; |
1355 | } | |
1356 | ||
e9ce7cb6 | 1357 | } while (dp != queue->dealloc_prod); |
f53c3fe8 | 1358 | |
e9ce7cb6 | 1359 | queue->dealloc_cons = dc; |
f53c3fe8 | 1360 | |
e9ce7cb6 | 1361 | if (gop - queue->tx_unmap_ops > 0) { |
f53c3fe8 | 1362 | int ret; |
e9ce7cb6 | 1363 | ret = gnttab_unmap_refs(queue->tx_unmap_ops, |
f53c3fe8 | 1364 | NULL, |
e9ce7cb6 WL |
1365 | queue->pages_to_unmap, |
1366 | gop - queue->tx_unmap_ops); | |
f53c3fe8 | 1367 | if (ret) { |
68946159 | 1368 | netdev_err(queue->vif->dev, "Unmap fail: nr_ops %tu ret %d\n", |
e9ce7cb6 WL |
1369 | gop - queue->tx_unmap_ops, ret); |
1370 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) { | |
f53c3fe8 | 1371 | if (gop[i].status != GNTST_okay) |
e9ce7cb6 | 1372 | netdev_err(queue->vif->dev, |
68946159 | 1373 | " host_addr: 0x%llx handle: 0x%x status: %d\n", |
f53c3fe8 ZK |
1374 | gop[i].host_addr, |
1375 | gop[i].handle, | |
1376 | gop[i].status); | |
1377 | } | |
1378 | BUG(); | |
1379 | } | |
1380 | } | |
1381 | ||
e9ce7cb6 WL |
1382 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) |
1383 | xenvif_idx_release(queue, pending_idx_release[i], | |
f53c3fe8 | 1384 | XEN_NETIF_RSP_OKAY); |
3e2234b3 ZK |
1385 | } |
1386 | ||
f53c3fe8 | 1387 | |
f942dc25 | 1388 | /* Called after netfront has transmitted */ |
e9ce7cb6 | 1389 | int xenvif_tx_action(struct xenvif_queue *queue, int budget) |
f942dc25 | 1390 | { |
ad7f402a | 1391 | unsigned nr_mops = 0, nr_cops = 0; |
f53c3fe8 | 1392 | int work_done, ret; |
f942dc25 | 1393 | |
e9ce7cb6 | 1394 | if (unlikely(!tx_work_todo(queue))) |
b3f980bd WL |
1395 | return 0; |
1396 | ||
e9ce7cb6 | 1397 | xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops); |
f942dc25 | 1398 | |
bdab8275 | 1399 | if (nr_cops == 0) |
b3f980bd WL |
1400 | return 0; |
1401 | ||
e9ce7cb6 | 1402 | gnttab_batch_copy(queue->tx_copy_ops, nr_cops); |
2991397d | 1403 | if (nr_mops != 0) { |
e9ce7cb6 | 1404 | ret = gnttab_map_refs(queue->tx_map_ops, |
bdab8275 | 1405 | NULL, |
e9ce7cb6 | 1406 | queue->pages_to_map, |
bdab8275 | 1407 | nr_mops); |
2991397d JB |
1408 | if (ret) { |
1409 | unsigned int i; | |
1410 | ||
1411 | netdev_err(queue->vif->dev, "Map fail: nr %u ret %d\n", | |
1412 | nr_mops, ret); | |
1413 | for (i = 0; i < nr_mops; ++i) | |
1414 | WARN_ON_ONCE(queue->tx_map_ops[i].status == | |
1415 | GNTST_okay); | |
1416 | } | |
1417 | } | |
f942dc25 | 1418 | |
e9ce7cb6 | 1419 | work_done = xenvif_tx_submit(queue); |
f942dc25 | 1420 | |
b3f980bd | 1421 | return work_done; |
f942dc25 IC |
1422 | } |
1423 | ||
7b55984c JB |
1424 | static void _make_tx_response(struct xenvif_queue *queue, |
1425 | const struct xen_netif_tx_request *txp, | |
1426 | unsigned int extra_count, | |
1427 | s8 status) | |
1428 | { | |
1429 | RING_IDX i = queue->tx.rsp_prod_pvt; | |
1430 | struct xen_netif_tx_response *resp; | |
1431 | ||
1432 | resp = RING_GET_RESPONSE(&queue->tx, i); | |
1433 | resp->id = txp->id; | |
1434 | resp->status = status; | |
1435 | ||
1436 | while (extra_count-- != 0) | |
1437 | RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL; | |
1438 | ||
1439 | queue->tx.rsp_prod_pvt = ++i; | |
1440 | } | |
1441 | ||
1442 | static void push_tx_responses(struct xenvif_queue *queue) | |
1443 | { | |
1444 | int notify; | |
1445 | ||
1446 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->tx, notify); | |
1447 | if (notify) | |
1448 | notify_remote_via_irq(queue->tx_irq); | |
1449 | } | |
1450 | ||
e9ce7cb6 | 1451 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7b55984c | 1452 | s8 status) |
f942dc25 | 1453 | { |
f942dc25 | 1454 | struct pending_tx_info *pending_tx_info; |
f53c3fe8 | 1455 | pending_ring_idx_t index; |
f53c3fe8 | 1456 | unsigned long flags; |
2810e5b9 | 1457 | |
e9ce7cb6 | 1458 | pending_tx_info = &queue->pending_tx_info[pending_idx]; |
7fbb9d84 | 1459 | |
e9ce7cb6 | 1460 | spin_lock_irqsave(&queue->response_lock, flags); |
7fbb9d84 | 1461 | |
7b55984c JB |
1462 | _make_tx_response(queue, &pending_tx_info->req, |
1463 | pending_tx_info->extra_count, status); | |
7fbb9d84 DV |
1464 | |
1465 | /* Release the pending index before pusing the Tx response so | |
1466 | * its available before a new Tx request is pushed by the | |
1467 | * frontend. | |
1468 | */ | |
1469 | index = pending_index(queue->pending_prod++); | |
e9ce7cb6 | 1470 | queue->pending_ring[index] = pending_idx; |
7fbb9d84 | 1471 | |
c8a4d299 | 1472 | push_tx_responses(queue); |
7fbb9d84 | 1473 | |
e9ce7cb6 | 1474 | spin_unlock_irqrestore(&queue->response_lock, flags); |
f942dc25 IC |
1475 | } |
1476 | ||
e9ce7cb6 | 1477 | static void make_tx_response(struct xenvif_queue *queue, |
7b55984c | 1478 | const struct xen_netif_tx_request *txp, |
562abd39 | 1479 | unsigned int extra_count, |
7b55984c | 1480 | s8 status) |
f942dc25 | 1481 | { |
7b55984c | 1482 | unsigned long flags; |
f942dc25 | 1483 | |
7b55984c | 1484 | spin_lock_irqsave(&queue->response_lock, flags); |
f942dc25 | 1485 | |
7b55984c JB |
1486 | _make_tx_response(queue, txp, extra_count, status); |
1487 | push_tx_responses(queue); | |
c8a4d299 | 1488 | |
7b55984c | 1489 | spin_unlock_irqrestore(&queue->response_lock, flags); |
c8a4d299 DV |
1490 | } |
1491 | ||
5834e72e | 1492 | static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) |
f53c3fe8 ZK |
1493 | { |
1494 | int ret; | |
1495 | struct gnttab_unmap_grant_ref tx_unmap_op; | |
1496 | ||
1497 | gnttab_set_unmap_op(&tx_unmap_op, | |
e9ce7cb6 | 1498 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1499 | GNTMAP_host_map, |
e9ce7cb6 WL |
1500 | queue->grant_tx_handle[pending_idx]); |
1501 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1502 | |
1503 | ret = gnttab_unmap_refs(&tx_unmap_op, NULL, | |
e9ce7cb6 | 1504 | &queue->mmap_pages[pending_idx], 1); |
7aceb47a | 1505 | if (ret) { |
e9ce7cb6 | 1506 | netdev_err(queue->vif->dev, |
68946159 | 1507 | "Unmap fail: ret: %d pending_idx: %d host_addr: %llx handle: 0x%x status: %d\n", |
7aceb47a ZK |
1508 | ret, |
1509 | pending_idx, | |
1510 | tx_unmap_op.host_addr, | |
1511 | tx_unmap_op.handle, | |
1512 | tx_unmap_op.status); | |
1513 | BUG(); | |
1514 | } | |
f53c3fe8 ZK |
1515 | } |
1516 | ||
e9ce7cb6 | 1517 | static inline int tx_work_todo(struct xenvif_queue *queue) |
f942dc25 | 1518 | { |
e9ce7cb6 | 1519 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))) |
f942dc25 IC |
1520 | return 1; |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
e9ce7cb6 | 1525 | static inline bool tx_dealloc_work_todo(struct xenvif_queue *queue) |
f53c3fe8 | 1526 | { |
e9ce7cb6 | 1527 | return queue->dealloc_cons != queue->dealloc_prod; |
f53c3fe8 ZK |
1528 | } |
1529 | ||
4e15ee2c | 1530 | void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue) |
f942dc25 | 1531 | { |
e9ce7cb6 WL |
1532 | if (queue->tx.sring) |
1533 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1534 | queue->tx.sring); | |
1535 | if (queue->rx.sring) | |
1536 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1537 | queue->rx.sring); | |
f942dc25 IC |
1538 | } |
1539 | ||
4e15ee2c PD |
1540 | int xenvif_map_frontend_data_rings(struct xenvif_queue *queue, |
1541 | grant_ref_t tx_ring_ref, | |
1542 | grant_ref_t rx_ring_ref) | |
f942dc25 | 1543 | { |
c9d63699 | 1544 | void *addr; |
f942dc25 IC |
1545 | struct xen_netif_tx_sring *txs; |
1546 | struct xen_netif_rx_sring *rxs; | |
9476654b | 1547 | RING_IDX rsp_prod, req_prod; |
bacc8daf | 1548 | int err; |
f942dc25 | 1549 | |
e9ce7cb6 | 1550 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1551 | &tx_ring_ref, 1, &addr); |
c9d63699 | 1552 | if (err) |
f942dc25 IC |
1553 | goto err; |
1554 | ||
c9d63699 | 1555 | txs = (struct xen_netif_tx_sring *)addr; |
9476654b PD |
1556 | rsp_prod = READ_ONCE(txs->rsp_prod); |
1557 | req_prod = READ_ONCE(txs->req_prod); | |
1558 | ||
1559 | BACK_RING_ATTACH(&queue->tx, txs, rsp_prod, XEN_PAGE_SIZE); | |
1560 | ||
1561 | err = -EIO; | |
1562 | if (req_prod - rsp_prod > RING_SIZE(&queue->tx)) | |
1563 | goto err; | |
f942dc25 | 1564 | |
e9ce7cb6 | 1565 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1566 | &rx_ring_ref, 1, &addr); |
c9d63699 | 1567 | if (err) |
f942dc25 | 1568 | goto err; |
f942dc25 | 1569 | |
c9d63699 | 1570 | rxs = (struct xen_netif_rx_sring *)addr; |
9476654b PD |
1571 | rsp_prod = READ_ONCE(rxs->rsp_prod); |
1572 | req_prod = READ_ONCE(rxs->req_prod); | |
1573 | ||
1574 | BACK_RING_ATTACH(&queue->rx, rxs, rsp_prod, XEN_PAGE_SIZE); | |
1575 | ||
1576 | err = -EIO; | |
1577 | if (req_prod - rsp_prod > RING_SIZE(&queue->rx)) | |
1578 | goto err; | |
f942dc25 IC |
1579 | |
1580 | return 0; | |
1581 | ||
1582 | err: | |
4e15ee2c | 1583 | xenvif_unmap_frontend_data_rings(queue); |
f942dc25 IC |
1584 | return err; |
1585 | } | |
1586 | ||
a64bd934 WL |
1587 | static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue) |
1588 | { | |
1589 | /* Dealloc thread must remain running until all inflight | |
1590 | * packets complete. | |
1591 | */ | |
1592 | return kthread_should_stop() && | |
1593 | !atomic_read(&queue->inflight_packets); | |
1594 | } | |
1595 | ||
f53c3fe8 ZK |
1596 | int xenvif_dealloc_kthread(void *data) |
1597 | { | |
e9ce7cb6 | 1598 | struct xenvif_queue *queue = data; |
f53c3fe8 | 1599 | |
a64bd934 | 1600 | for (;;) { |
e9ce7cb6 WL |
1601 | wait_event_interruptible(queue->dealloc_wq, |
1602 | tx_dealloc_work_todo(queue) || | |
a64bd934 WL |
1603 | xenvif_dealloc_kthread_should_stop(queue)); |
1604 | if (xenvif_dealloc_kthread_should_stop(queue)) | |
f53c3fe8 ZK |
1605 | break; |
1606 | ||
e9ce7cb6 | 1607 | xenvif_tx_dealloc_action(queue); |
f53c3fe8 ZK |
1608 | cond_resched(); |
1609 | } | |
1610 | ||
1611 | /* Unmap anything remaining*/ | |
e9ce7cb6 WL |
1612 | if (tx_dealloc_work_todo(queue)) |
1613 | xenvif_tx_dealloc_action(queue); | |
f53c3fe8 ZK |
1614 | |
1615 | return 0; | |
1616 | } | |
1617 | ||
4e15ee2c PD |
1618 | static void make_ctrl_response(struct xenvif *vif, |
1619 | const struct xen_netif_ctrl_request *req, | |
1620 | u32 status, u32 data) | |
1621 | { | |
1622 | RING_IDX idx = vif->ctrl.rsp_prod_pvt; | |
1623 | struct xen_netif_ctrl_response rsp = { | |
1624 | .id = req->id, | |
1625 | .type = req->type, | |
1626 | .status = status, | |
1627 | .data = data, | |
1628 | }; | |
1629 | ||
1630 | *RING_GET_RESPONSE(&vif->ctrl, idx) = rsp; | |
1631 | vif->ctrl.rsp_prod_pvt = ++idx; | |
1632 | } | |
1633 | ||
1634 | static void push_ctrl_response(struct xenvif *vif) | |
1635 | { | |
1636 | int notify; | |
1637 | ||
1638 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->ctrl, notify); | |
1639 | if (notify) | |
1640 | notify_remote_via_irq(vif->ctrl_irq); | |
1641 | } | |
1642 | ||
1643 | static void process_ctrl_request(struct xenvif *vif, | |
1644 | const struct xen_netif_ctrl_request *req) | |
1645 | { | |
40d8abde PD |
1646 | u32 status = XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED; |
1647 | u32 data = 0; | |
1648 | ||
1649 | switch (req->type) { | |
1650 | case XEN_NETIF_CTRL_TYPE_SET_HASH_ALGORITHM: | |
1651 | status = xenvif_set_hash_alg(vif, req->data[0]); | |
1652 | break; | |
1653 | ||
1654 | case XEN_NETIF_CTRL_TYPE_GET_HASH_FLAGS: | |
1655 | status = xenvif_get_hash_flags(vif, &data); | |
1656 | break; | |
1657 | ||
1658 | case XEN_NETIF_CTRL_TYPE_SET_HASH_FLAGS: | |
1659 | status = xenvif_set_hash_flags(vif, req->data[0]); | |
1660 | break; | |
1661 | ||
1662 | case XEN_NETIF_CTRL_TYPE_SET_HASH_KEY: | |
1663 | status = xenvif_set_hash_key(vif, req->data[0], | |
1664 | req->data[1]); | |
1665 | break; | |
1666 | ||
1667 | case XEN_NETIF_CTRL_TYPE_GET_HASH_MAPPING_SIZE: | |
1668 | status = XEN_NETIF_CTRL_STATUS_SUCCESS; | |
1669 | data = XEN_NETBK_MAX_HASH_MAPPING_SIZE; | |
1670 | break; | |
1671 | ||
1672 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING_SIZE: | |
1673 | status = xenvif_set_hash_mapping_size(vif, | |
1674 | req->data[0]); | |
1675 | break; | |
1676 | ||
1677 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING: | |
1678 | status = xenvif_set_hash_mapping(vif, req->data[0], | |
1679 | req->data[1], | |
1680 | req->data[2]); | |
1681 | break; | |
1682 | ||
1683 | default: | |
1684 | break; | |
1685 | } | |
1686 | ||
1687 | make_ctrl_response(vif, req, status, data); | |
4e15ee2c PD |
1688 | push_ctrl_response(vif); |
1689 | } | |
1690 | ||
1691 | static void xenvif_ctrl_action(struct xenvif *vif) | |
1692 | { | |
1693 | for (;;) { | |
1694 | RING_IDX req_prod, req_cons; | |
1695 | ||
1696 | req_prod = vif->ctrl.sring->req_prod; | |
1697 | req_cons = vif->ctrl.req_cons; | |
1698 | ||
1699 | /* Make sure we can see requests before we process them. */ | |
1700 | rmb(); | |
1701 | ||
1702 | if (req_cons == req_prod) | |
1703 | break; | |
1704 | ||
1705 | while (req_cons != req_prod) { | |
1706 | struct xen_netif_ctrl_request req; | |
1707 | ||
1708 | RING_COPY_REQUEST(&vif->ctrl, req_cons, &req); | |
1709 | req_cons++; | |
1710 | ||
1711 | process_ctrl_request(vif, &req); | |
1712 | } | |
1713 | ||
1714 | vif->ctrl.req_cons = req_cons; | |
1715 | vif->ctrl.sring->req_event = req_cons + 1; | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | static bool xenvif_ctrl_work_todo(struct xenvif *vif) | |
1720 | { | |
1721 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&vif->ctrl))) | |
d3e2a25b | 1722 | return true; |
4e15ee2c | 1723 | |
d3e2a25b | 1724 | return false; |
4e15ee2c PD |
1725 | } |
1726 | ||
0364a882 | 1727 | irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data) |
4e15ee2c PD |
1728 | { |
1729 | struct xenvif *vif = data; | |
23025393 | 1730 | unsigned int eoi_flag = XEN_EOI_FLAG_SPURIOUS; |
4e15ee2c | 1731 | |
23025393 | 1732 | while (xenvif_ctrl_work_todo(vif)) { |
0364a882 | 1733 | xenvif_ctrl_action(vif); |
23025393 JG |
1734 | eoi_flag = 0; |
1735 | } | |
1736 | ||
1737 | xen_irq_lateeoi(irq, eoi_flag); | |
4e15ee2c | 1738 | |
0364a882 | 1739 | return IRQ_HANDLED; |
4e15ee2c PD |
1740 | } |
1741 | ||
f942dc25 IC |
1742 | static int __init netback_init(void) |
1743 | { | |
f942dc25 | 1744 | int rc = 0; |
f942dc25 | 1745 | |
2a14b244 | 1746 | if (!xen_domain()) |
f942dc25 IC |
1747 | return -ENODEV; |
1748 | ||
56dd5af9 | 1749 | /* Allow as many queues as there are CPUs but max. 8 if user has not |
4c82ac3c WL |
1750 | * specified a value. |
1751 | */ | |
1752 | if (xenvif_max_queues == 0) | |
56dd5af9 JG |
1753 | xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
1754 | num_online_cpus()); | |
8d3d53b3 | 1755 | |
37641494 | 1756 | if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) { |
383eda32 JP |
1757 | pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n", |
1758 | fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX); | |
37641494 | 1759 | fatal_skb_slots = XEN_NETBK_LEGACY_SLOTS_MAX; |
2810e5b9 WL |
1760 | } |
1761 | ||
f942dc25 IC |
1762 | rc = xenvif_xenbus_init(); |
1763 | if (rc) | |
1764 | goto failed_init; | |
1765 | ||
f51de243 ZK |
1766 | #ifdef CONFIG_DEBUG_FS |
1767 | xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL); | |
f51de243 ZK |
1768 | #endif /* CONFIG_DEBUG_FS */ |
1769 | ||
f942dc25 IC |
1770 | return 0; |
1771 | ||
1772 | failed_init: | |
f942dc25 | 1773 | return rc; |
f942dc25 IC |
1774 | } |
1775 | ||
1776 | module_init(netback_init); | |
1777 | ||
b103f358 WL |
1778 | static void __exit netback_fini(void) |
1779 | { | |
f51de243 | 1780 | #ifdef CONFIG_DEBUG_FS |
aad06d11 | 1781 | debugfs_remove_recursive(xen_netback_dbg_root); |
f51de243 | 1782 | #endif /* CONFIG_DEBUG_FS */ |
b103f358 | 1783 | xenvif_xenbus_fini(); |
b103f358 WL |
1784 | } |
1785 | module_exit(netback_fini); | |
1786 | ||
5b8e3464 | 1787 | MODULE_DESCRIPTION("Xen backend network device module"); |
f942dc25 | 1788 | MODULE_LICENSE("Dual BSD/GPL"); |
f984cec6 | 1789 | MODULE_ALIAS("xen-backend:vif"); |