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> |
f942dc25 IC |
41 | |
42 | #include <net/tcp.h> | |
43 | ||
ca981633 | 44 | #include <xen/xen.h> |
f942dc25 IC |
45 | #include <xen/events.h> |
46 | #include <xen/interface/memory.h> | |
a9fd60e2 | 47 | #include <xen/page.h> |
f942dc25 IC |
48 | |
49 | #include <asm/xen/hypercall.h> | |
f942dc25 | 50 | |
e1f00a69 WL |
51 | /* Provide an option to disable split event channels at load time as |
52 | * event channels are limited resource. Split event channels are | |
53 | * enabled by default. | |
54 | */ | |
c489dbb1 | 55 | bool separate_tx_rx_irq = true; |
e1f00a69 WL |
56 | module_param(separate_tx_rx_irq, bool, 0644); |
57 | ||
f48da8b1 DV |
58 | /* The time that packets can stay on the guest Rx internal queue |
59 | * before they are dropped. | |
09350788 ZK |
60 | */ |
61 | unsigned int rx_drain_timeout_msecs = 10000; | |
62 | module_param(rx_drain_timeout_msecs, uint, 0444); | |
09350788 | 63 | |
ecf08d2d DV |
64 | /* The length of time before the frontend is considered unresponsive |
65 | * because it isn't providing Rx slots. | |
66 | */ | |
26c0e102 | 67 | unsigned int rx_stall_timeout_msecs = 60000; |
ecf08d2d | 68 | module_param(rx_stall_timeout_msecs, uint, 0444); |
ecf08d2d | 69 | |
56dd5af9 | 70 | #define MAX_QUEUES_DEFAULT 8 |
8d3d53b3 AB |
71 | unsigned int xenvif_max_queues; |
72 | module_param_named(max_queues, xenvif_max_queues, uint, 0644); | |
73 | MODULE_PARM_DESC(max_queues, | |
74 | "Maximum number of queues per virtual interface"); | |
75 | ||
2810e5b9 WL |
76 | /* |
77 | * This is the maximum slots a skb can have. If a guest sends a skb | |
78 | * which exceeds this limit it is considered malicious. | |
79 | */ | |
37641494 WL |
80 | #define FATAL_SKB_SLOTS_DEFAULT 20 |
81 | static unsigned int fatal_skb_slots = FATAL_SKB_SLOTS_DEFAULT; | |
82 | module_param(fatal_skb_slots, uint, 0444); | |
83 | ||
7e5d7753 MC |
84 | /* The amount to copy out of the first guest Tx slot into the skb's |
85 | * linear area. If the first slot has more data, it will be mapped | |
86 | * and put into the first frag. | |
87 | * | |
88 | * This is sized to avoid pulling headers from the frags for most | |
89 | * TCP/IP packets. | |
90 | */ | |
91 | #define XEN_NETBACK_TX_COPY_LEN 128 | |
92 | ||
40d8abde PD |
93 | /* This is the maximum number of flows in the hash cache. */ |
94 | #define XENVIF_HASH_CACHE_SIZE_DEFAULT 64 | |
95 | unsigned int xenvif_hash_cache_size = XENVIF_HASH_CACHE_SIZE_DEFAULT; | |
96 | module_param_named(hash_cache_size, xenvif_hash_cache_size, uint, 0644); | |
97 | MODULE_PARM_DESC(hash_cache_size, "Number of flows in the hash cache"); | |
7e5d7753 | 98 | |
1c9535c7 DK |
99 | /* The module parameter tells that we have to put data |
100 | * for xen-netfront with the XDP_PACKET_HEADROOM offset | |
101 | * needed for XDP processing | |
102 | */ | |
103 | bool provides_xdp_headroom = true; | |
104 | module_param(provides_xdp_headroom, bool, 0644); | |
105 | ||
e9ce7cb6 | 106 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a WL |
107 | u8 status); |
108 | ||
e9ce7cb6 | 109 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 110 | struct xen_netif_tx_request *txp, |
562abd39 | 111 | unsigned int extra_count, |
f942dc25 | 112 | s8 st); |
c8a4d299 | 113 | static void push_tx_responses(struct xenvif_queue *queue); |
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; |
f53c3fe8 | 211 | unsigned long flags; |
f942dc25 IC |
212 | |
213 | do { | |
e9ce7cb6 | 214 | spin_lock_irqsave(&queue->response_lock, flags); |
562abd39 | 215 | make_tx_response(queue, txp, extra_count, XEN_NETIF_RSP_ERROR); |
c8a4d299 | 216 | push_tx_responses(queue); |
e9ce7cb6 | 217 | spin_unlock_irqrestore(&queue->response_lock, flags); |
b9149729 | 218 | if (cons == end) |
f942dc25 | 219 | break; |
68a33bfd | 220 | RING_COPY_REQUEST(&queue->tx, cons++, txp); |
72eec92a | 221 | extra_count = 0; /* only the first frag can have extras */ |
f942dc25 | 222 | } while (1); |
e9ce7cb6 | 223 | queue->tx.req_cons = cons; |
f942dc25 IC |
224 | } |
225 | ||
7376419a | 226 | static void xenvif_fatal_tx_err(struct xenvif *vif) |
48856286 IC |
227 | { |
228 | netdev_err(vif->dev, "fatal error; disabling device\n"); | |
e9d8b2c2 | 229 | vif->disabled = true; |
e9ce7cb6 | 230 | /* Disable the vif from queue 0's kthread */ |
b17075d5 | 231 | if (vif->num_queues) |
e9ce7cb6 | 232 | xenvif_kick_thread(&vif->queues[0]); |
48856286 IC |
233 | } |
234 | ||
e9ce7cb6 | 235 | static int xenvif_count_requests(struct xenvif_queue *queue, |
7376419a | 236 | struct xen_netif_tx_request *first, |
562abd39 | 237 | unsigned int extra_count, |
7376419a WL |
238 | struct xen_netif_tx_request *txp, |
239 | int work_to_do) | |
f942dc25 | 240 | { |
e9ce7cb6 | 241 | RING_IDX cons = queue->tx.req_cons; |
2810e5b9 WL |
242 | int slots = 0; |
243 | int drop_err = 0; | |
59ccb4eb | 244 | int more_data; |
f942dc25 IC |
245 | |
246 | if (!(first->flags & XEN_NETTXF_more_data)) | |
247 | return 0; | |
248 | ||
249 | do { | |
59ccb4eb WL |
250 | struct xen_netif_tx_request dropped_tx = { 0 }; |
251 | ||
2810e5b9 | 252 | if (slots >= work_to_do) { |
e9ce7cb6 | 253 | netdev_err(queue->vif->dev, |
2810e5b9 WL |
254 | "Asked for %d slots but exceeds this limit\n", |
255 | work_to_do); | |
e9ce7cb6 | 256 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 257 | return -ENODATA; |
f942dc25 IC |
258 | } |
259 | ||
2810e5b9 WL |
260 | /* This guest is really using too many slots and |
261 | * considered malicious. | |
262 | */ | |
37641494 | 263 | if (unlikely(slots >= fatal_skb_slots)) { |
e9ce7cb6 | 264 | netdev_err(queue->vif->dev, |
2810e5b9 | 265 | "Malicious frontend using %d slots, threshold %u\n", |
37641494 | 266 | slots, fatal_skb_slots); |
e9ce7cb6 | 267 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 268 | return -E2BIG; |
f942dc25 IC |
269 | } |
270 | ||
2810e5b9 | 271 | /* Xen network protocol had implicit dependency on |
37641494 WL |
272 | * MAX_SKB_FRAGS. XEN_NETBK_LEGACY_SLOTS_MAX is set to |
273 | * the historical MAX_SKB_FRAGS value 18 to honor the | |
274 | * same behavior as before. Any packet using more than | |
275 | * 18 slots but less than fatal_skb_slots slots is | |
276 | * dropped | |
2810e5b9 | 277 | */ |
37641494 | 278 | if (!drop_err && slots >= XEN_NETBK_LEGACY_SLOTS_MAX) { |
2810e5b9 | 279 | if (net_ratelimit()) |
e9ce7cb6 | 280 | netdev_dbg(queue->vif->dev, |
2810e5b9 | 281 | "Too many slots (%d) exceeding limit (%d), dropping packet\n", |
37641494 | 282 | slots, XEN_NETBK_LEGACY_SLOTS_MAX); |
2810e5b9 WL |
283 | drop_err = -E2BIG; |
284 | } | |
285 | ||
59ccb4eb WL |
286 | if (drop_err) |
287 | txp = &dropped_tx; | |
288 | ||
68a33bfd | 289 | RING_COPY_REQUEST(&queue->tx, cons + slots, txp); |
03393fd5 WL |
290 | |
291 | /* If the guest submitted a frame >= 64 KiB then | |
292 | * first->size overflowed and following slots will | |
293 | * appear to be larger than the frame. | |
294 | * | |
295 | * This cannot be fatal error as there are buggy | |
296 | * frontends that do this. | |
297 | * | |
298 | * Consume all slots and drop the packet. | |
299 | */ | |
300 | if (!drop_err && txp->size > first->size) { | |
301 | if (net_ratelimit()) | |
e9ce7cb6 | 302 | netdev_dbg(queue->vif->dev, |
03393fd5 WL |
303 | "Invalid tx request, slot size %u > remaining size %u\n", |
304 | txp->size, first->size); | |
305 | drop_err = -EIO; | |
f942dc25 IC |
306 | } |
307 | ||
308 | first->size -= txp->size; | |
2810e5b9 | 309 | slots++; |
f942dc25 | 310 | |
d0089e8a | 311 | if (unlikely((txp->offset + txp->size) > XEN_PAGE_SIZE)) { |
68946159 | 312 | netdev_err(queue->vif->dev, "Cross page boundary, txp->offset: %u, size: %u\n", |
f942dc25 | 313 | txp->offset, txp->size); |
e9ce7cb6 | 314 | xenvif_fatal_tx_err(queue->vif); |
35876b5f | 315 | return -EINVAL; |
f942dc25 | 316 | } |
59ccb4eb WL |
317 | |
318 | more_data = txp->flags & XEN_NETTXF_more_data; | |
319 | ||
320 | if (!drop_err) | |
321 | txp++; | |
322 | ||
323 | } while (more_data); | |
2810e5b9 WL |
324 | |
325 | if (drop_err) { | |
562abd39 | 326 | xenvif_tx_err(queue, first, extra_count, cons + slots); |
2810e5b9 WL |
327 | return drop_err; |
328 | } | |
329 | ||
330 | return slots; | |
f942dc25 IC |
331 | } |
332 | ||
8f13dd96 ZK |
333 | |
334 | struct xenvif_tx_cb { | |
ad7f402a RL |
335 | u16 copy_pending_idx[XEN_NETBK_LEGACY_SLOTS_MAX + 1]; |
336 | u8 copy_count; | |
05310f31 | 337 | u32 split_mask; |
8f13dd96 ZK |
338 | }; |
339 | ||
340 | #define XENVIF_TX_CB(skb) ((struct xenvif_tx_cb *)(skb)->cb) | |
ad7f402a RL |
341 | #define copy_pending_idx(skb, i) (XENVIF_TX_CB(skb)->copy_pending_idx[i]) |
342 | #define copy_count(skb) (XENVIF_TX_CB(skb)->copy_count) | |
8f13dd96 | 343 | |
e9ce7cb6 | 344 | static inline void xenvif_tx_create_map_op(struct xenvif_queue *queue, |
562abd39 PD |
345 | u16 pending_idx, |
346 | struct xen_netif_tx_request *txp, | |
347 | unsigned int extra_count, | |
348 | struct gnttab_map_grant_ref *mop) | |
f53c3fe8 | 349 | { |
e9ce7cb6 WL |
350 | queue->pages_to_map[mop-queue->tx_map_ops] = queue->mmap_pages[pending_idx]; |
351 | gnttab_set_map_op(mop, idx_to_kaddr(queue, pending_idx), | |
f53c3fe8 | 352 | GNTMAP_host_map | GNTMAP_readonly, |
e9ce7cb6 | 353 | txp->gref, queue->vif->domid); |
f53c3fe8 | 354 | |
e9ce7cb6 | 355 | memcpy(&queue->pending_tx_info[pending_idx].req, txp, |
f53c3fe8 | 356 | sizeof(*txp)); |
562abd39 | 357 | queue->pending_tx_info[pending_idx].extra_count = extra_count; |
f53c3fe8 ZK |
358 | } |
359 | ||
e3377f36 ZK |
360 | static inline struct sk_buff *xenvif_alloc_skb(unsigned int size) |
361 | { | |
362 | struct sk_buff *skb = | |
363 | alloc_skb(size + NET_SKB_PAD + NET_IP_ALIGN, | |
364 | GFP_ATOMIC | __GFP_NOWARN); | |
05310f31 JG |
365 | |
366 | BUILD_BUG_ON(sizeof(*XENVIF_TX_CB(skb)) > sizeof(skb->cb)); | |
e3377f36 ZK |
367 | if (unlikely(skb == NULL)) |
368 | return NULL; | |
369 | ||
370 | /* Packets passed to netif_rx() must have some headroom. */ | |
371 | skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); | |
372 | ||
373 | /* Initialize it here to avoid later surprises */ | |
374 | skb_shinfo(skb)->destructor_arg = NULL; | |
375 | ||
376 | return skb; | |
377 | } | |
378 | ||
ad7f402a RL |
379 | static void xenvif_get_requests(struct xenvif_queue *queue, |
380 | struct sk_buff *skb, | |
381 | struct xen_netif_tx_request *first, | |
382 | struct xen_netif_tx_request *txfrags, | |
383 | unsigned *copy_ops, | |
384 | unsigned *map_ops, | |
385 | unsigned int frag_overflow, | |
386 | struct sk_buff *nskb, | |
387 | unsigned int extra_count, | |
388 | unsigned int data_len) | |
f942dc25 IC |
389 | { |
390 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
391 | skb_frag_t *frags = shinfo->frags; | |
ad7f402a | 392 | u16 pending_idx; |
62bad319 | 393 | pending_ring_idx_t index; |
2475b225 | 394 | unsigned int nr_slots; |
ad7f402a RL |
395 | struct gnttab_copy *cop = queue->tx_copy_ops + *copy_ops; |
396 | struct gnttab_map_grant_ref *gop = queue->tx_map_ops + *map_ops; | |
397 | struct xen_netif_tx_request *txp = first; | |
398 | ||
534fc31d | 399 | nr_slots = shinfo->nr_frags + frag_overflow + 1; |
ad7f402a RL |
400 | |
401 | copy_count(skb) = 0; | |
05310f31 | 402 | XENVIF_TX_CB(skb)->split_mask = 0; |
ad7f402a RL |
403 | |
404 | /* Create copy ops for exactly data_len bytes into the skb head. */ | |
405 | __skb_put(skb, data_len); | |
406 | while (data_len > 0) { | |
407 | int amount = data_len > txp->size ? txp->size : data_len; | |
05310f31 | 408 | bool split = false; |
ad7f402a RL |
409 | |
410 | cop->source.u.ref = txp->gref; | |
411 | cop->source.domid = queue->vif->domid; | |
412 | cop->source.offset = txp->offset; | |
413 | ||
414 | cop->dest.domid = DOMID_SELF; | |
415 | cop->dest.offset = (offset_in_page(skb->data + | |
416 | skb_headlen(skb) - | |
417 | data_len)) & ~XEN_PAGE_MASK; | |
418 | cop->dest.u.gmfn = virt_to_gfn(skb->data + skb_headlen(skb) | |
419 | - data_len); | |
420 | ||
05310f31 JG |
421 | /* Don't cross local page boundary! */ |
422 | if (cop->dest.offset + amount > XEN_PAGE_SIZE) { | |
423 | amount = XEN_PAGE_SIZE - cop->dest.offset; | |
424 | XENVIF_TX_CB(skb)->split_mask |= 1U << copy_count(skb); | |
425 | split = true; | |
426 | } | |
427 | ||
ad7f402a RL |
428 | cop->len = amount; |
429 | cop->flags = GNTCOPY_source_gref; | |
2810e5b9 | 430 | |
ad7f402a RL |
431 | index = pending_index(queue->pending_cons); |
432 | pending_idx = queue->pending_ring[index]; | |
433 | callback_param(queue, pending_idx).ctx = NULL; | |
434 | copy_pending_idx(skb, copy_count(skb)) = pending_idx; | |
05310f31 JG |
435 | if (!split) |
436 | copy_count(skb)++; | |
ad7f402a RL |
437 | |
438 | cop++; | |
439 | data_len -= amount; | |
f942dc25 | 440 | |
ad7f402a RL |
441 | if (amount == txp->size) { |
442 | /* The copy op covered the full tx_request */ | |
443 | ||
444 | memcpy(&queue->pending_tx_info[pending_idx].req, | |
445 | txp, sizeof(*txp)); | |
446 | queue->pending_tx_info[pending_idx].extra_count = | |
447 | (txp == first) ? extra_count : 0; | |
448 | ||
449 | if (txp == first) | |
450 | txp = txfrags; | |
451 | else | |
452 | txp++; | |
453 | queue->pending_cons++; | |
454 | nr_slots--; | |
455 | } else { | |
456 | /* The copy op partially covered the tx_request. | |
05310f31 JG |
457 | * The remainder will be mapped or copied in the next |
458 | * iteration. | |
ad7f402a RL |
459 | */ |
460 | txp->offset += amount; | |
461 | txp->size -= amount; | |
462 | } | |
463 | } | |
f942dc25 | 464 | |
534fc31d RL |
465 | for (shinfo->nr_frags = 0; nr_slots > 0 && shinfo->nr_frags < MAX_SKB_FRAGS; |
466 | shinfo->nr_frags++, gop++, nr_slots--) { | |
e9ce7cb6 WL |
467 | index = pending_index(queue->pending_cons++); |
468 | pending_idx = queue->pending_ring[index]; | |
ad7f402a RL |
469 | xenvif_tx_create_map_op(queue, pending_idx, txp, |
470 | txp == first ? extra_count : 0, gop); | |
f53c3fe8 | 471 | frag_set_pending_idx(&frags[shinfo->nr_frags], pending_idx); |
ad7f402a RL |
472 | |
473 | if (txp == first) | |
474 | txp = txfrags; | |
475 | else | |
476 | txp++; | |
f942dc25 IC |
477 | } |
478 | ||
534fc31d | 479 | if (nr_slots > 0) { |
e3377f36 ZK |
480 | |
481 | shinfo = skb_shinfo(nskb); | |
482 | frags = shinfo->frags; | |
483 | ||
534fc31d | 484 | for (shinfo->nr_frags = 0; shinfo->nr_frags < nr_slots; |
e3377f36 | 485 | shinfo->nr_frags++, txp++, gop++) { |
e9ce7cb6 WL |
486 | index = pending_index(queue->pending_cons++); |
487 | pending_idx = queue->pending_ring[index]; | |
562abd39 PD |
488 | xenvif_tx_create_map_op(queue, pending_idx, txp, 0, |
489 | gop); | |
e3377f36 ZK |
490 | frag_set_pending_idx(&frags[shinfo->nr_frags], |
491 | pending_idx); | |
492 | } | |
493 | ||
494 | skb_shinfo(skb)->frag_list = nskb; | |
534fc31d RL |
495 | } else if (nskb) { |
496 | /* A frag_list skb was allocated but it is no longer needed | |
497 | * because enough slots were converted to copy ops above. | |
498 | */ | |
499 | kfree_skb(nskb); | |
e3377f36 | 500 | } |
2810e5b9 | 501 | |
ad7f402a RL |
502 | (*copy_ops) = cop - queue->tx_copy_ops; |
503 | (*map_ops) = gop - queue->tx_map_ops; | |
f942dc25 IC |
504 | } |
505 | ||
e9ce7cb6 | 506 | static inline void xenvif_grant_handle_set(struct xenvif_queue *queue, |
f53c3fe8 ZK |
507 | u16 pending_idx, |
508 | grant_handle_t handle) | |
509 | { | |
e9ce7cb6 | 510 | if (unlikely(queue->grant_tx_handle[pending_idx] != |
f53c3fe8 | 511 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 512 | netdev_err(queue->vif->dev, |
68946159 | 513 | "Trying to overwrite active handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
514 | pending_idx); |
515 | BUG(); | |
516 | } | |
e9ce7cb6 | 517 | queue->grant_tx_handle[pending_idx] = handle; |
f53c3fe8 ZK |
518 | } |
519 | ||
e9ce7cb6 | 520 | static inline void xenvif_grant_handle_reset(struct xenvif_queue *queue, |
f53c3fe8 ZK |
521 | u16 pending_idx) |
522 | { | |
e9ce7cb6 | 523 | if (unlikely(queue->grant_tx_handle[pending_idx] == |
f53c3fe8 | 524 | NETBACK_INVALID_HANDLE)) { |
e9ce7cb6 | 525 | netdev_err(queue->vif->dev, |
68946159 | 526 | "Trying to unmap invalid handle! pending_idx: 0x%x\n", |
f53c3fe8 ZK |
527 | pending_idx); |
528 | BUG(); | |
529 | } | |
e9ce7cb6 | 530 | queue->grant_tx_handle[pending_idx] = NETBACK_INVALID_HANDLE; |
f53c3fe8 ZK |
531 | } |
532 | ||
e9ce7cb6 | 533 | static int xenvif_tx_check_gop(struct xenvif_queue *queue, |
7376419a | 534 | struct sk_buff *skb, |
bdab8275 ZK |
535 | struct gnttab_map_grant_ref **gopp_map, |
536 | struct gnttab_copy **gopp_copy) | |
f942dc25 | 537 | { |
9074ce24 | 538 | struct gnttab_map_grant_ref *gop_map = *gopp_map; |
ad7f402a | 539 | u16 pending_idx; |
1a998d3e ZK |
540 | /* This always points to the shinfo of the skb being checked, which |
541 | * could be either the first or the one on the frag_list | |
542 | */ | |
f942dc25 | 543 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
1a998d3e ZK |
544 | /* If this is non-NULL, we are currently checking the frag_list skb, and |
545 | * this points to the shinfo of the first one | |
546 | */ | |
547 | struct skb_shared_info *first_shinfo = NULL; | |
f942dc25 | 548 | int nr_frags = shinfo->nr_frags; |
1b860da0 | 549 | const bool sharedslot = nr_frags && |
ad7f402a RL |
550 | frag_get_pending_idx(&shinfo->frags[0]) == |
551 | copy_pending_idx(skb, copy_count(skb) - 1); | |
7dfa764e | 552 | int i, err = 0; |
f942dc25 | 553 | |
ad7f402a RL |
554 | for (i = 0; i < copy_count(skb); i++) { |
555 | int newerr; | |
556 | ||
557 | /* Check status of header. */ | |
558 | pending_idx = copy_pending_idx(skb, i); | |
559 | ||
560 | newerr = (*gopp_copy)->status; | |
05310f31 JG |
561 | |
562 | /* Split copies need to be handled together. */ | |
563 | if (XENVIF_TX_CB(skb)->split_mask & (1U << i)) { | |
564 | (*gopp_copy)++; | |
565 | if (!newerr) | |
566 | newerr = (*gopp_copy)->status; | |
567 | } | |
ad7f402a RL |
568 | if (likely(!newerr)) { |
569 | /* The first frag might still have this slot mapped */ | |
570 | if (i < copy_count(skb) - 1 || !sharedslot) | |
571 | xenvif_idx_release(queue, pending_idx, | |
572 | XEN_NETIF_RSP_OKAY); | |
573 | } else { | |
574 | err = newerr; | |
575 | if (net_ratelimit()) | |
576 | netdev_dbg(queue->vif->dev, | |
577 | "Grant copy of header failed! status: %d pending_idx: %u ref: %u\n", | |
578 | (*gopp_copy)->status, | |
579 | pending_idx, | |
580 | (*gopp_copy)->source.u.ref); | |
581 | /* The first frag might still have this slot mapped */ | |
582 | if (i < copy_count(skb) - 1 || !sharedslot) | |
583 | xenvif_idx_release(queue, pending_idx, | |
584 | XEN_NETIF_RSP_ERROR); | |
585 | } | |
586 | (*gopp_copy)++; | |
bdab8275 | 587 | } |
f942dc25 | 588 | |
e3377f36 | 589 | check_frags: |
bdab8275 | 590 | for (i = 0; i < nr_frags; i++, gop_map++) { |
f942dc25 | 591 | int j, newerr; |
f942dc25 | 592 | |
ea066ad1 | 593 | pending_idx = frag_get_pending_idx(&shinfo->frags[i]); |
f942dc25 IC |
594 | |
595 | /* Check error status: if okay then remember grant handle. */ | |
bdab8275 | 596 | newerr = gop_map->status; |
2810e5b9 | 597 | |
f942dc25 | 598 | if (likely(!newerr)) { |
e9ce7cb6 | 599 | xenvif_grant_handle_set(queue, |
9074ce24 ZK |
600 | pending_idx, |
601 | gop_map->handle); | |
f942dc25 | 602 | /* Had a previous error? Invalidate this fragment. */ |
1b860da0 | 603 | if (unlikely(err)) { |
e9ce7cb6 | 604 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
605 | /* If the mapping of the first frag was OK, but |
606 | * the header's copy failed, and they are | |
607 | * sharing a slot, send an error | |
608 | */ | |
3ede7f84 | 609 | if (i == 0 && !first_shinfo && sharedslot) |
1b860da0 ZK |
610 | xenvif_idx_release(queue, pending_idx, |
611 | XEN_NETIF_RSP_ERROR); | |
612 | else | |
613 | xenvif_idx_release(queue, pending_idx, | |
614 | XEN_NETIF_RSP_OKAY); | |
615 | } | |
f942dc25 IC |
616 | continue; |
617 | } | |
618 | ||
619 | /* Error on this fragment: respond to client with an error. */ | |
bdab8275 | 620 | if (net_ratelimit()) |
e9ce7cb6 | 621 | netdev_dbg(queue->vif->dev, |
00aefceb | 622 | "Grant map of %d. frag failed! status: %d pending_idx: %u ref: %u\n", |
bdab8275 ZK |
623 | i, |
624 | gop_map->status, | |
625 | pending_idx, | |
626 | gop_map->ref); | |
1b860da0 | 627 | |
e9ce7cb6 | 628 | xenvif_idx_release(queue, pending_idx, XEN_NETIF_RSP_ERROR); |
f942dc25 IC |
629 | |
630 | /* Not the first error? Preceding frags already invalidated. */ | |
631 | if (err) | |
632 | continue; | |
1b860da0 | 633 | |
1b860da0 | 634 | /* Invalidate preceding fragments of this skb. */ |
bdab8275 | 635 | for (j = 0; j < i; j++) { |
5ccb3ea7 | 636 | pending_idx = frag_get_pending_idx(&shinfo->frags[j]); |
e9ce7cb6 | 637 | xenvif_idx_unmap(queue, pending_idx); |
1b860da0 ZK |
638 | xenvif_idx_release(queue, pending_idx, |
639 | XEN_NETIF_RSP_OKAY); | |
f942dc25 IC |
640 | } |
641 | ||
1a998d3e ZK |
642 | /* And if we found the error while checking the frag_list, unmap |
643 | * the first skb's frags | |
644 | */ | |
645 | if (first_shinfo) { | |
646 | for (j = 0; j < first_shinfo->nr_frags; j++) { | |
647 | pending_idx = frag_get_pending_idx(&first_shinfo->frags[j]); | |
648 | xenvif_idx_unmap(queue, pending_idx); | |
1b860da0 ZK |
649 | xenvif_idx_release(queue, pending_idx, |
650 | XEN_NETIF_RSP_OKAY); | |
1a998d3e | 651 | } |
f942dc25 IC |
652 | } |
653 | ||
654 | /* Remember the error: invalidate all subsequent fragments. */ | |
655 | err = newerr; | |
656 | } | |
657 | ||
1a998d3e | 658 | if (skb_has_frag_list(skb) && !first_shinfo) { |
826d8217 JB |
659 | first_shinfo = shinfo; |
660 | shinfo = skb_shinfo(shinfo->frag_list); | |
e3377f36 | 661 | nr_frags = shinfo->nr_frags; |
e3377f36 ZK |
662 | |
663 | goto check_frags; | |
664 | } | |
665 | ||
bdab8275 | 666 | *gopp_map = gop_map; |
f942dc25 IC |
667 | return err; |
668 | } | |
669 | ||
e9ce7cb6 | 670 | static void xenvif_fill_frags(struct xenvif_queue *queue, struct sk_buff *skb) |
f942dc25 IC |
671 | { |
672 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
673 | int nr_frags = shinfo->nr_frags; | |
674 | int i; | |
f53c3fe8 ZK |
675 | u16 prev_pending_idx = INVALID_PENDING_IDX; |
676 | ||
f942dc25 IC |
677 | for (i = 0; i < nr_frags; i++) { |
678 | skb_frag_t *frag = shinfo->frags + i; | |
679 | struct xen_netif_tx_request *txp; | |
ea066ad1 IC |
680 | struct page *page; |
681 | u16 pending_idx; | |
f942dc25 | 682 | |
ea066ad1 | 683 | pending_idx = frag_get_pending_idx(frag); |
f942dc25 | 684 | |
f53c3fe8 | 685 | /* If this is not the first frag, chain it to the previous*/ |
bdab8275 | 686 | if (prev_pending_idx == INVALID_PENDING_IDX) |
f53c3fe8 | 687 | skb_shinfo(skb)->destructor_arg = |
e9ce7cb6 | 688 | &callback_param(queue, pending_idx); |
bdab8275 | 689 | else |
e9ce7cb6 WL |
690 | callback_param(queue, prev_pending_idx).ctx = |
691 | &callback_param(queue, pending_idx); | |
f53c3fe8 | 692 | |
e9ce7cb6 | 693 | callback_param(queue, pending_idx).ctx = NULL; |
f53c3fe8 ZK |
694 | prev_pending_idx = pending_idx; |
695 | ||
e9ce7cb6 | 696 | txp = &queue->pending_tx_info[pending_idx].req; |
e36bfc0b | 697 | page = virt_to_page((void *)idx_to_kaddr(queue, pending_idx)); |
ea066ad1 | 698 | __skb_fill_page_desc(skb, i, page, txp->offset, txp->size); |
f942dc25 IC |
699 | skb->len += txp->size; |
700 | skb->data_len += txp->size; | |
701 | skb->truesize += txp->size; | |
702 | ||
f53c3fe8 | 703 | /* Take an extra reference to offset network stack's put_page */ |
e9ce7cb6 | 704 | get_page(queue->mmap_pages[pending_idx]); |
f942dc25 IC |
705 | } |
706 | } | |
707 | ||
e9ce7cb6 | 708 | static int xenvif_get_extras(struct xenvif_queue *queue, |
562abd39 PD |
709 | struct xen_netif_extra_info *extras, |
710 | unsigned int *extra_count, | |
711 | int work_to_do) | |
f942dc25 IC |
712 | { |
713 | struct xen_netif_extra_info extra; | |
e9ce7cb6 | 714 | RING_IDX cons = queue->tx.req_cons; |
f942dc25 IC |
715 | |
716 | do { | |
717 | if (unlikely(work_to_do-- <= 0)) { | |
e9ce7cb6 WL |
718 | netdev_err(queue->vif->dev, "Missing extra info\n"); |
719 | xenvif_fatal_tx_err(queue->vif); | |
f942dc25 IC |
720 | return -EBADR; |
721 | } | |
722 | ||
68a33bfd | 723 | RING_COPY_REQUEST(&queue->tx, cons, &extra); |
562abd39 PD |
724 | |
725 | queue->tx.req_cons = ++cons; | |
726 | (*extra_count)++; | |
727 | ||
f942dc25 IC |
728 | if (unlikely(!extra.type || |
729 | extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { | |
e9ce7cb6 | 730 | netdev_err(queue->vif->dev, |
f942dc25 | 731 | "Invalid extra type: %d\n", extra.type); |
e9ce7cb6 | 732 | xenvif_fatal_tx_err(queue->vif); |
f942dc25 IC |
733 | return -EINVAL; |
734 | } | |
735 | ||
736 | memcpy(&extras[extra.type - 1], &extra, sizeof(extra)); | |
f942dc25 IC |
737 | } while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
738 | ||
739 | return work_to_do; | |
740 | } | |
741 | ||
7376419a WL |
742 | static int xenvif_set_skb_gso(struct xenvif *vif, |
743 | struct sk_buff *skb, | |
744 | struct xen_netif_extra_info *gso) | |
f942dc25 IC |
745 | { |
746 | if (!gso->u.gso.size) { | |
48856286 | 747 | netdev_err(vif->dev, "GSO size must not be zero.\n"); |
7376419a | 748 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
749 | return -EINVAL; |
750 | } | |
751 | ||
a9468587 PD |
752 | switch (gso->u.gso.type) { |
753 | case XEN_NETIF_GSO_TYPE_TCPV4: | |
754 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
755 | break; | |
756 | case XEN_NETIF_GSO_TYPE_TCPV6: | |
757 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
758 | break; | |
759 | default: | |
48856286 | 760 | netdev_err(vif->dev, "Bad GSO type %d.\n", gso->u.gso.type); |
7376419a | 761 | xenvif_fatal_tx_err(vif); |
f942dc25 IC |
762 | return -EINVAL; |
763 | } | |
764 | ||
765 | skb_shinfo(skb)->gso_size = gso->u.gso.size; | |
b89587a7 | 766 | /* gso_segs will be calculated later */ |
f942dc25 IC |
767 | |
768 | return 0; | |
769 | } | |
770 | ||
e9ce7cb6 | 771 | static int checksum_setup(struct xenvif_queue *queue, struct sk_buff *skb) |
2eba61d5 | 772 | { |
2721637c | 773 | bool recalculate_partial_csum = false; |
2eba61d5 PD |
774 | |
775 | /* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy | |
776 | * peers can fail to set NETRXF_csum_blank when sending a GSO | |
777 | * frame. In this case force the SKB to CHECKSUM_PARTIAL and | |
778 | * recalculate the partial checksum. | |
779 | */ | |
780 | if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { | |
e9ce7cb6 | 781 | queue->stats.rx_gso_checksum_fixup++; |
2eba61d5 | 782 | skb->ip_summed = CHECKSUM_PARTIAL; |
2721637c | 783 | recalculate_partial_csum = true; |
2eba61d5 PD |
784 | } |
785 | ||
786 | /* A non-CHECKSUM_PARTIAL SKB does not require setup. */ | |
787 | if (skb->ip_summed != CHECKSUM_PARTIAL) | |
788 | return 0; | |
789 | ||
2721637c | 790 | return skb_checksum_setup(skb, recalculate_partial_csum); |
2eba61d5 PD |
791 | } |
792 | ||
e9ce7cb6 | 793 | static bool tx_credit_exceeded(struct xenvif_queue *queue, unsigned size) |
f942dc25 | 794 | { |
059dfa6a | 795 | u64 now = get_jiffies_64(); |
e9ce7cb6 WL |
796 | u64 next_credit = queue->credit_window_start + |
797 | msecs_to_jiffies(queue->credit_usec / 1000); | |
f942dc25 IC |
798 | |
799 | /* Timer could already be pending in rare cases. */ | |
dfa523ae WL |
800 | if (timer_pending(&queue->credit_timeout)) { |
801 | queue->rate_limited = true; | |
f942dc25 | 802 | return true; |
dfa523ae | 803 | } |
f942dc25 IC |
804 | |
805 | /* Passed the point where we can replenish credit? */ | |
059dfa6a | 806 | if (time_after_eq64(now, next_credit)) { |
e9ce7cb6 WL |
807 | queue->credit_window_start = now; |
808 | tx_add_credit(queue); | |
f942dc25 IC |
809 | } |
810 | ||
811 | /* Still too big to send right now? Set a callback. */ | |
e9ce7cb6 | 812 | if (size > queue->remaining_credit) { |
e9ce7cb6 | 813 | mod_timer(&queue->credit_timeout, |
f942dc25 | 814 | next_credit); |
e9ce7cb6 | 815 | queue->credit_window_start = next_credit; |
dfa523ae | 816 | queue->rate_limited = true; |
f942dc25 IC |
817 | |
818 | return true; | |
819 | } | |
820 | ||
821 | return false; | |
822 | } | |
823 | ||
210c34dc PD |
824 | /* No locking is required in xenvif_mcast_add/del() as they are |
825 | * only ever invoked from NAPI poll. An RCU list is used because | |
826 | * xenvif_mcast_match() is called asynchronously, during start_xmit. | |
827 | */ | |
828 | ||
829 | static int xenvif_mcast_add(struct xenvif *vif, const u8 *addr) | |
830 | { | |
831 | struct xenvif_mcast_addr *mcast; | |
832 | ||
833 | if (vif->fe_mcast_count == XEN_NETBK_MCAST_MAX) { | |
834 | if (net_ratelimit()) | |
835 | netdev_err(vif->dev, | |
836 | "Too many multicast addresses\n"); | |
837 | return -ENOSPC; | |
838 | } | |
839 | ||
840 | mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC); | |
841 | if (!mcast) | |
842 | return -ENOMEM; | |
843 | ||
844 | ether_addr_copy(mcast->addr, addr); | |
845 | list_add_tail_rcu(&mcast->entry, &vif->fe_mcast_addr); | |
846 | vif->fe_mcast_count++; | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | static void xenvif_mcast_del(struct xenvif *vif, const u8 *addr) | |
852 | { | |
853 | struct xenvif_mcast_addr *mcast; | |
854 | ||
855 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
856 | if (ether_addr_equal(addr, mcast->addr)) { | |
857 | --vif->fe_mcast_count; | |
858 | list_del_rcu(&mcast->entry); | |
859 | kfree_rcu(mcast, rcu); | |
860 | break; | |
861 | } | |
862 | } | |
863 | } | |
864 | ||
865 | bool xenvif_mcast_match(struct xenvif *vif, const u8 *addr) | |
866 | { | |
867 | struct xenvif_mcast_addr *mcast; | |
868 | ||
869 | rcu_read_lock(); | |
870 | list_for_each_entry_rcu(mcast, &vif->fe_mcast_addr, entry) { | |
871 | if (ether_addr_equal(addr, mcast->addr)) { | |
872 | rcu_read_unlock(); | |
873 | return true; | |
874 | } | |
875 | } | |
876 | rcu_read_unlock(); | |
877 | ||
878 | return false; | |
879 | } | |
880 | ||
881 | void xenvif_mcast_addr_list_free(struct xenvif *vif) | |
882 | { | |
883 | /* No need for locking or RCU here. NAPI poll and TX queue | |
884 | * are stopped. | |
885 | */ | |
886 | while (!list_empty(&vif->fe_mcast_addr)) { | |
887 | struct xenvif_mcast_addr *mcast; | |
888 | ||
889 | mcast = list_first_entry(&vif->fe_mcast_addr, | |
890 | struct xenvif_mcast_addr, | |
891 | entry); | |
892 | --vif->fe_mcast_count; | |
893 | list_del(&mcast->entry); | |
894 | kfree(mcast); | |
895 | } | |
896 | } | |
897 | ||
e9ce7cb6 | 898 | static void xenvif_tx_build_gops(struct xenvif_queue *queue, |
bdab8275 ZK |
899 | int budget, |
900 | unsigned *copy_ops, | |
901 | unsigned *map_ops) | |
f942dc25 | 902 | { |
2475b225 | 903 | struct sk_buff *skb, *nskb; |
f942dc25 | 904 | int ret; |
2475b225 | 905 | unsigned int frag_overflow; |
f942dc25 | 906 | |
e9ce7cb6 | 907 | while (skb_queue_len(&queue->tx_queue) < budget) { |
f942dc25 | 908 | struct xen_netif_tx_request txreq; |
37641494 | 909 | struct xen_netif_tx_request txfrags[XEN_NETBK_LEGACY_SLOTS_MAX]; |
f942dc25 | 910 | struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX-1]; |
562abd39 | 911 | unsigned int extra_count; |
f942dc25 IC |
912 | RING_IDX idx; |
913 | int work_to_do; | |
914 | unsigned int data_len; | |
f942dc25 | 915 | |
e9ce7cb6 | 916 | if (queue->tx.sring->req_prod - queue->tx.req_cons > |
48856286 | 917 | XEN_NETIF_TX_RING_SIZE) { |
e9ce7cb6 | 918 | netdev_err(queue->vif->dev, |
48856286 IC |
919 | "Impossible number of requests. " |
920 | "req_prod %d, req_cons %d, size %ld\n", | |
e9ce7cb6 | 921 | queue->tx.sring->req_prod, queue->tx.req_cons, |
48856286 | 922 | XEN_NETIF_TX_RING_SIZE); |
e9ce7cb6 | 923 | xenvif_fatal_tx_err(queue->vif); |
e9d8b2c2 | 924 | break; |
48856286 IC |
925 | } |
926 | ||
09e545f7 | 927 | work_to_do = XEN_RING_NR_UNCONSUMED_REQUESTS(&queue->tx); |
b3f980bd WL |
928 | if (!work_to_do) |
929 | break; | |
f942dc25 | 930 | |
e9ce7cb6 | 931 | idx = queue->tx.req_cons; |
f942dc25 | 932 | rmb(); /* Ensure that we see the request before we copy it. */ |
68a33bfd | 933 | RING_COPY_REQUEST(&queue->tx, idx, &txreq); |
f942dc25 IC |
934 | |
935 | /* Credit-based scheduling. */ | |
e9ce7cb6 WL |
936 | if (txreq.size > queue->remaining_credit && |
937 | tx_credit_exceeded(queue, txreq.size)) | |
b3f980bd | 938 | break; |
f942dc25 | 939 | |
e9ce7cb6 | 940 | queue->remaining_credit -= txreq.size; |
f942dc25 IC |
941 | |
942 | work_to_do--; | |
e9ce7cb6 | 943 | queue->tx.req_cons = ++idx; |
f942dc25 IC |
944 | |
945 | memset(extras, 0, sizeof(extras)); | |
562abd39 | 946 | extra_count = 0; |
f942dc25 | 947 | if (txreq.flags & XEN_NETTXF_extra_info) { |
e9ce7cb6 | 948 | work_to_do = xenvif_get_extras(queue, extras, |
562abd39 | 949 | &extra_count, |
7376419a | 950 | work_to_do); |
e9ce7cb6 | 951 | idx = queue->tx.req_cons; |
48856286 | 952 | if (unlikely(work_to_do < 0)) |
b3f980bd | 953 | break; |
f942dc25 IC |
954 | } |
955 | ||
210c34dc PD |
956 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1].type) { |
957 | struct xen_netif_extra_info *extra; | |
958 | ||
959 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_ADD - 1]; | |
960 | ret = xenvif_mcast_add(queue->vif, extra->u.mcast.addr); | |
961 | ||
562abd39 | 962 | make_tx_response(queue, &txreq, extra_count, |
210c34dc PD |
963 | (ret == 0) ? |
964 | XEN_NETIF_RSP_OKAY : | |
965 | XEN_NETIF_RSP_ERROR); | |
966 | push_tx_responses(queue); | |
967 | continue; | |
968 | } | |
969 | ||
970 | if (extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1].type) { | |
971 | struct xen_netif_extra_info *extra; | |
972 | ||
973 | extra = &extras[XEN_NETIF_EXTRA_TYPE_MCAST_DEL - 1]; | |
974 | xenvif_mcast_del(queue->vif, extra->u.mcast.addr); | |
975 | ||
562abd39 PD |
976 | make_tx_response(queue, &txreq, extra_count, |
977 | XEN_NETIF_RSP_OKAY); | |
210c34dc PD |
978 | push_tx_responses(queue); |
979 | continue; | |
980 | } | |
981 | ||
ad7f402a RL |
982 | data_len = (txreq.size > XEN_NETBACK_TX_COPY_LEN) ? |
983 | XEN_NETBACK_TX_COPY_LEN : txreq.size; | |
984 | ||
562abd39 PD |
985 | ret = xenvif_count_requests(queue, &txreq, extra_count, |
986 | txfrags, work_to_do); | |
ad7f402a | 987 | |
48856286 | 988 | if (unlikely(ret < 0)) |
b3f980bd | 989 | break; |
48856286 | 990 | |
f942dc25 IC |
991 | idx += ret; |
992 | ||
993 | if (unlikely(txreq.size < ETH_HLEN)) { | |
e9ce7cb6 | 994 | netdev_dbg(queue->vif->dev, |
f942dc25 | 995 | "Bad packet size: %d\n", txreq.size); |
562abd39 | 996 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
b3f980bd | 997 | break; |
f942dc25 IC |
998 | } |
999 | ||
1000 | /* No crossing a page as the payload mustn't fragment. */ | |
d0089e8a | 1001 | if (unlikely((txreq.offset + txreq.size) > XEN_PAGE_SIZE)) { |
2eca98e5 JG |
1002 | netdev_err(queue->vif->dev, "Cross page boundary, txreq.offset: %u, size: %u\n", |
1003 | txreq.offset, txreq.size); | |
e9ce7cb6 | 1004 | xenvif_fatal_tx_err(queue->vif); |
b3f980bd | 1005 | break; |
f942dc25 IC |
1006 | } |
1007 | ||
ad7f402a RL |
1008 | if (ret >= XEN_NETBK_LEGACY_SLOTS_MAX - 1 && data_len < txreq.size) |
1009 | data_len = txreq.size; | |
f942dc25 | 1010 | |
e3377f36 | 1011 | skb = xenvif_alloc_skb(data_len); |
f942dc25 | 1012 | if (unlikely(skb == NULL)) { |
e9ce7cb6 | 1013 | netdev_dbg(queue->vif->dev, |
f942dc25 | 1014 | "Can't allocate a skb in start_xmit.\n"); |
562abd39 | 1015 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
f942dc25 IC |
1016 | break; |
1017 | } | |
1018 | ||
2475b225 | 1019 | skb_shinfo(skb)->nr_frags = ret; |
2475b225 RL |
1020 | /* At this point shinfo->nr_frags is in fact the number of |
1021 | * slots, which can be as large as XEN_NETBK_LEGACY_SLOTS_MAX. | |
1022 | */ | |
1023 | frag_overflow = 0; | |
1024 | nskb = NULL; | |
1025 | if (skb_shinfo(skb)->nr_frags > MAX_SKB_FRAGS) { | |
1026 | frag_overflow = skb_shinfo(skb)->nr_frags - MAX_SKB_FRAGS; | |
1027 | BUG_ON(frag_overflow > MAX_SKB_FRAGS); | |
1028 | skb_shinfo(skb)->nr_frags = MAX_SKB_FRAGS; | |
1029 | nskb = xenvif_alloc_skb(0); | |
1030 | if (unlikely(nskb == NULL)) { | |
3a0233dd | 1031 | skb_shinfo(skb)->nr_frags = 0; |
2475b225 | 1032 | kfree_skb(skb); |
562abd39 | 1033 | xenvif_tx_err(queue, &txreq, extra_count, idx); |
2475b225 RL |
1034 | if (net_ratelimit()) |
1035 | netdev_err(queue->vif->dev, | |
1036 | "Can't allocate the frag_list skb.\n"); | |
1037 | break; | |
1038 | } | |
1039 | } | |
1040 | ||
f942dc25 IC |
1041 | if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
1042 | struct xen_netif_extra_info *gso; | |
1043 | gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; | |
1044 | ||
e9ce7cb6 | 1045 | if (xenvif_set_skb_gso(queue->vif, skb, gso)) { |
7376419a | 1046 | /* Failure in xenvif_set_skb_gso is fatal. */ |
3a0233dd | 1047 | skb_shinfo(skb)->nr_frags = 0; |
f942dc25 | 1048 | kfree_skb(skb); |
2475b225 | 1049 | kfree_skb(nskb); |
b3f980bd | 1050 | break; |
f942dc25 IC |
1051 | } |
1052 | } | |
1053 | ||
c2d09fde PD |
1054 | if (extras[XEN_NETIF_EXTRA_TYPE_HASH - 1].type) { |
1055 | struct xen_netif_extra_info *extra; | |
1056 | enum pkt_hash_types type = PKT_HASH_TYPE_NONE; | |
1057 | ||
1058 | extra = &extras[XEN_NETIF_EXTRA_TYPE_HASH - 1]; | |
1059 | ||
1060 | switch (extra->u.hash.type) { | |
1061 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4: | |
1062 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6: | |
1063 | type = PKT_HASH_TYPE_L3; | |
1064 | break; | |
1065 | ||
1066 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP: | |
1067 | case _XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP: | |
1068 | type = PKT_HASH_TYPE_L4; | |
1069 | break; | |
1070 | ||
1071 | default: | |
1072 | break; | |
1073 | } | |
1074 | ||
1075 | if (type != PKT_HASH_TYPE_NONE) | |
1076 | skb_set_hash(skb, | |
1077 | *(u32 *)extra->u.hash.value, | |
1078 | type); | |
1079 | } | |
1080 | ||
ad7f402a RL |
1081 | xenvif_get_requests(queue, skb, &txreq, txfrags, copy_ops, |
1082 | map_ops, frag_overflow, nskb, extra_count, | |
1083 | data_len); | |
f942dc25 | 1084 | |
e9ce7cb6 | 1085 | __skb_queue_tail(&queue->tx_queue, skb); |
1e0b6eac | 1086 | |
e9ce7cb6 | 1087 | queue->tx.req_cons = idx; |
f942dc25 IC |
1088 | } |
1089 | ||
bdab8275 | 1090 | return; |
f942dc25 IC |
1091 | } |
1092 | ||
e3377f36 ZK |
1093 | /* Consolidate skb with a frag_list into a brand new one with local pages on |
1094 | * frags. Returns 0 or -ENOMEM if can't allocate new pages. | |
1095 | */ | |
e9ce7cb6 | 1096 | static int xenvif_handle_frag_list(struct xenvif_queue *queue, struct sk_buff *skb) |
e3377f36 ZK |
1097 | { |
1098 | unsigned int offset = skb_headlen(skb); | |
1099 | skb_frag_t frags[MAX_SKB_FRAGS]; | |
49d9991a | 1100 | int i, f; |
e3377f36 ZK |
1101 | struct ubuf_info *uarg; |
1102 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; | |
1103 | ||
e9ce7cb6 WL |
1104 | queue->stats.tx_zerocopy_sent += 2; |
1105 | queue->stats.tx_frag_overflow++; | |
e3377f36 | 1106 | |
e9ce7cb6 | 1107 | xenvif_fill_frags(queue, nskb); |
e3377f36 ZK |
1108 | /* Subtract frags size, we will correct it later */ |
1109 | skb->truesize -= skb->data_len; | |
1110 | skb->len += nskb->len; | |
1111 | skb->data_len += nskb->len; | |
1112 | ||
1113 | /* create a brand new frags array and coalesce there */ | |
1114 | for (i = 0; offset < skb->len; i++) { | |
1115 | struct page *page; | |
1116 | unsigned int len; | |
1117 | ||
1118 | BUG_ON(i >= MAX_SKB_FRAGS); | |
44cc8ed1 | 1119 | page = alloc_page(GFP_ATOMIC); |
e3377f36 ZK |
1120 | if (!page) { |
1121 | int j; | |
1122 | skb->truesize += skb->data_len; | |
1123 | for (j = 0; j < i; j++) | |
d7840976 | 1124 | put_page(skb_frag_page(&frags[j])); |
e3377f36 ZK |
1125 | return -ENOMEM; |
1126 | } | |
1127 | ||
1128 | if (offset + PAGE_SIZE < skb->len) | |
1129 | len = PAGE_SIZE; | |
1130 | else | |
1131 | len = skb->len - offset; | |
1132 | if (skb_copy_bits(skb, offset, page_address(page), len)) | |
1133 | BUG(); | |
1134 | ||
1135 | offset += len; | |
b51f4113 | 1136 | skb_frag_fill_page_desc(&frags[i], page, 0, len); |
e3377f36 | 1137 | } |
49d9991a DV |
1138 | |
1139 | /* Release all the original (foreign) frags. */ | |
1140 | for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) | |
1141 | skb_frag_unref(skb, f); | |
e3377f36 | 1142 | uarg = skb_shinfo(skb)->destructor_arg; |
a64bd934 WL |
1143 | /* increase inflight counter to offset decrement in callback */ |
1144 | atomic_inc(&queue->inflight_packets); | |
36177832 | 1145 | uarg->callback(NULL, uarg, true); |
e3377f36 ZK |
1146 | skb_shinfo(skb)->destructor_arg = NULL; |
1147 | ||
b0c21bad DV |
1148 | /* Fill the skb with the new (local) frags. */ |
1149 | memcpy(skb_shinfo(skb)->frags, frags, i * sizeof(skb_frag_t)); | |
1150 | skb_shinfo(skb)->nr_frags = i; | |
1151 | skb->truesize += i * PAGE_SIZE; | |
e3377f36 ZK |
1152 | |
1153 | return 0; | |
1154 | } | |
b3f980bd | 1155 | |
e9ce7cb6 | 1156 | static int xenvif_tx_submit(struct xenvif_queue *queue) |
f942dc25 | 1157 | { |
e9ce7cb6 WL |
1158 | struct gnttab_map_grant_ref *gop_map = queue->tx_map_ops; |
1159 | struct gnttab_copy *gop_copy = queue->tx_copy_ops; | |
f942dc25 | 1160 | struct sk_buff *skb; |
b3f980bd | 1161 | int work_done = 0; |
f942dc25 | 1162 | |
e9ce7cb6 | 1163 | while ((skb = __skb_dequeue(&queue->tx_queue)) != NULL) { |
f942dc25 | 1164 | struct xen_netif_tx_request *txp; |
f942dc25 | 1165 | u16 pending_idx; |
f942dc25 | 1166 | |
ad7f402a | 1167 | pending_idx = copy_pending_idx(skb, 0); |
e9ce7cb6 | 1168 | txp = &queue->pending_tx_info[pending_idx].req; |
f942dc25 IC |
1169 | |
1170 | /* Check the remap error code. */ | |
e9ce7cb6 | 1171 | if (unlikely(xenvif_tx_check_gop(queue, skb, &gop_map, &gop_copy))) { |
b42cc6e4 ZK |
1172 | /* If there was an error, xenvif_tx_check_gop is |
1173 | * expected to release all the frags which were mapped, | |
1174 | * so kfree_skb shouldn't do it again | |
1175 | */ | |
f942dc25 | 1176 | skb_shinfo(skb)->nr_frags = 0; |
b42cc6e4 ZK |
1177 | if (skb_has_frag_list(skb)) { |
1178 | struct sk_buff *nskb = | |
1179 | skb_shinfo(skb)->frag_list; | |
1180 | skb_shinfo(nskb)->nr_frags = 0; | |
1181 | } | |
f942dc25 IC |
1182 | kfree_skb(skb); |
1183 | continue; | |
1184 | } | |
1185 | ||
f942dc25 IC |
1186 | if (txp->flags & XEN_NETTXF_csum_blank) |
1187 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1188 | else if (txp->flags & XEN_NETTXF_data_validated) | |
1189 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1190 | ||
e9ce7cb6 | 1191 | xenvif_fill_frags(queue, skb); |
f942dc25 | 1192 | |
e3377f36 | 1193 | if (unlikely(skb_has_frag_list(skb))) { |
99e87f56 ID |
1194 | struct sk_buff *nskb = skb_shinfo(skb)->frag_list; |
1195 | xenvif_skb_zerocopy_prepare(queue, nskb); | |
e9ce7cb6 | 1196 | if (xenvif_handle_frag_list(queue, skb)) { |
e3377f36 | 1197 | if (net_ratelimit()) |
e9ce7cb6 | 1198 | netdev_err(queue->vif->dev, |
e3377f36 | 1199 | "Not enough memory to consolidate frag_list!\n"); |
a64bd934 | 1200 | xenvif_skb_zerocopy_prepare(queue, skb); |
e3377f36 ZK |
1201 | kfree_skb(skb); |
1202 | continue; | |
1203 | } | |
99e87f56 ID |
1204 | /* Copied all the bits from the frag list -- free it. */ |
1205 | skb_frag_list_init(skb); | |
1206 | kfree_skb(nskb); | |
e3377f36 ZK |
1207 | } |
1208 | ||
e9ce7cb6 | 1209 | skb->dev = queue->vif->dev; |
f942dc25 | 1210 | skb->protocol = eth_type_trans(skb, skb->dev); |
f9ca8f74 | 1211 | skb_reset_network_header(skb); |
f942dc25 | 1212 | |
e9ce7cb6 WL |
1213 | if (checksum_setup(queue, skb)) { |
1214 | netdev_dbg(queue->vif->dev, | |
f942dc25 | 1215 | "Can't setup checksum in net_tx_action\n"); |
f53c3fe8 ZK |
1216 | /* We have to set this flag to trigger the callback */ |
1217 | if (skb_shinfo(skb)->destructor_arg) | |
a64bd934 | 1218 | xenvif_skb_zerocopy_prepare(queue, skb); |
f942dc25 IC |
1219 | kfree_skb(skb); |
1220 | continue; | |
1221 | } | |
1222 | ||
d2aa125d | 1223 | skb_probe_transport_header(skb); |
f9ca8f74 | 1224 | |
b89587a7 PD |
1225 | /* If the packet is GSO then we will have just set up the |
1226 | * transport header offset in checksum_setup so it's now | |
1227 | * straightforward to calculate gso_segs. | |
1228 | */ | |
1229 | if (skb_is_gso(skb)) { | |
d2aa125d MM |
1230 | int mss, hdrlen; |
1231 | ||
1232 | /* GSO implies having the L4 header. */ | |
1233 | WARN_ON_ONCE(!skb_transport_header_was_set(skb)); | |
1234 | if (unlikely(!skb_transport_header_was_set(skb))) { | |
1235 | kfree_skb(skb); | |
1236 | continue; | |
1237 | } | |
1238 | ||
1239 | mss = skb_shinfo(skb)->gso_size; | |
504148fe | 1240 | hdrlen = skb_tcp_all_headers(skb); |
b89587a7 PD |
1241 | |
1242 | skb_shinfo(skb)->gso_segs = | |
1243 | DIV_ROUND_UP(skb->len - hdrlen, mss); | |
1244 | } | |
1245 | ||
e9ce7cb6 WL |
1246 | queue->stats.rx_bytes += skb->len; |
1247 | queue->stats.rx_packets++; | |
f942dc25 | 1248 | |
b3f980bd WL |
1249 | work_done++; |
1250 | ||
f53c3fe8 ZK |
1251 | /* Set this flag right before netif_receive_skb, otherwise |
1252 | * someone might think this packet already left netback, and | |
1253 | * do a skb_copy_ubufs while we are still in control of the | |
1254 | * skb. E.g. the __pskb_pull_tail earlier can do such thing. | |
1255 | */ | |
1bb332af | 1256 | if (skb_shinfo(skb)->destructor_arg) { |
a64bd934 | 1257 | xenvif_skb_zerocopy_prepare(queue, skb); |
e9ce7cb6 | 1258 | queue->stats.tx_zerocopy_sent++; |
1bb332af | 1259 | } |
f53c3fe8 | 1260 | |
b3f980bd | 1261 | netif_receive_skb(skb); |
f942dc25 | 1262 | } |
b3f980bd WL |
1263 | |
1264 | return work_done; | |
f942dc25 IC |
1265 | } |
1266 | ||
b63ca3e8 | 1267 | void xenvif_zerocopy_callback(struct sk_buff *skb, struct ubuf_info *ubuf_base, |
36177832 | 1268 | bool zerocopy_success) |
3e2234b3 | 1269 | { |
f53c3fe8 ZK |
1270 | unsigned long flags; |
1271 | pending_ring_idx_t index; | |
b63ca3e8 | 1272 | struct ubuf_info_msgzc *ubuf = uarg_to_msgzc(ubuf_base); |
e9ce7cb6 | 1273 | struct xenvif_queue *queue = ubuf_to_queue(ubuf); |
f53c3fe8 ZK |
1274 | |
1275 | /* This is the only place where we grab this lock, to protect callbacks | |
1276 | * from each other. | |
1277 | */ | |
e9ce7cb6 | 1278 | spin_lock_irqsave(&queue->callback_lock, flags); |
f53c3fe8 ZK |
1279 | do { |
1280 | u16 pending_idx = ubuf->desc; | |
b63ca3e8 | 1281 | ubuf = (struct ubuf_info_msgzc *) ubuf->ctx; |
e9ce7cb6 | 1282 | BUG_ON(queue->dealloc_prod - queue->dealloc_cons >= |
f53c3fe8 | 1283 | MAX_PENDING_REQS); |
e9ce7cb6 WL |
1284 | index = pending_index(queue->dealloc_prod); |
1285 | queue->dealloc_ring[index] = pending_idx; | |
f53c3fe8 ZK |
1286 | /* Sync with xenvif_tx_dealloc_action: |
1287 | * insert idx then incr producer. | |
1288 | */ | |
1289 | smp_wmb(); | |
e9ce7cb6 | 1290 | queue->dealloc_prod++; |
f53c3fe8 | 1291 | } while (ubuf); |
e9ce7cb6 | 1292 | spin_unlock_irqrestore(&queue->callback_lock, flags); |
f53c3fe8 | 1293 | |
1bb332af | 1294 | if (likely(zerocopy_success)) |
e9ce7cb6 | 1295 | queue->stats.tx_zerocopy_success++; |
1bb332af | 1296 | else |
e9ce7cb6 | 1297 | queue->stats.tx_zerocopy_fail++; |
a64bd934 | 1298 | xenvif_skb_zerocopy_complete(queue); |
f53c3fe8 ZK |
1299 | } |
1300 | ||
e9ce7cb6 | 1301 | static inline void xenvif_tx_dealloc_action(struct xenvif_queue *queue) |
f53c3fe8 ZK |
1302 | { |
1303 | struct gnttab_unmap_grant_ref *gop; | |
1304 | pending_ring_idx_t dc, dp; | |
1305 | u16 pending_idx, pending_idx_release[MAX_PENDING_REQS]; | |
1306 | unsigned int i = 0; | |
1307 | ||
e9ce7cb6 WL |
1308 | dc = queue->dealloc_cons; |
1309 | gop = queue->tx_unmap_ops; | |
f53c3fe8 ZK |
1310 | |
1311 | /* Free up any grants we have finished using */ | |
1312 | do { | |
e9ce7cb6 | 1313 | dp = queue->dealloc_prod; |
f53c3fe8 ZK |
1314 | |
1315 | /* Ensure we see all indices enqueued by all | |
1316 | * xenvif_zerocopy_callback(). | |
1317 | */ | |
1318 | smp_rmb(); | |
1319 | ||
1320 | while (dc != dp) { | |
50c2e4dd | 1321 | BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS); |
f53c3fe8 | 1322 | pending_idx = |
e9ce7cb6 | 1323 | queue->dealloc_ring[pending_index(dc++)]; |
f53c3fe8 | 1324 | |
50c2e4dd | 1325 | pending_idx_release[gop - queue->tx_unmap_ops] = |
f53c3fe8 | 1326 | pending_idx; |
50c2e4dd | 1327 | queue->pages_to_unmap[gop - queue->tx_unmap_ops] = |
e9ce7cb6 | 1328 | queue->mmap_pages[pending_idx]; |
f53c3fe8 | 1329 | gnttab_set_unmap_op(gop, |
e9ce7cb6 | 1330 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1331 | GNTMAP_host_map, |
e9ce7cb6 WL |
1332 | queue->grant_tx_handle[pending_idx]); |
1333 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1334 | ++gop; |
1335 | } | |
1336 | ||
e9ce7cb6 | 1337 | } while (dp != queue->dealloc_prod); |
f53c3fe8 | 1338 | |
e9ce7cb6 | 1339 | queue->dealloc_cons = dc; |
f53c3fe8 | 1340 | |
e9ce7cb6 | 1341 | if (gop - queue->tx_unmap_ops > 0) { |
f53c3fe8 | 1342 | int ret; |
e9ce7cb6 | 1343 | ret = gnttab_unmap_refs(queue->tx_unmap_ops, |
f53c3fe8 | 1344 | NULL, |
e9ce7cb6 WL |
1345 | queue->pages_to_unmap, |
1346 | gop - queue->tx_unmap_ops); | |
f53c3fe8 | 1347 | if (ret) { |
68946159 | 1348 | netdev_err(queue->vif->dev, "Unmap fail: nr_ops %tu ret %d\n", |
e9ce7cb6 WL |
1349 | gop - queue->tx_unmap_ops, ret); |
1350 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) { | |
f53c3fe8 | 1351 | if (gop[i].status != GNTST_okay) |
e9ce7cb6 | 1352 | netdev_err(queue->vif->dev, |
68946159 | 1353 | " host_addr: 0x%llx handle: 0x%x status: %d\n", |
f53c3fe8 ZK |
1354 | gop[i].host_addr, |
1355 | gop[i].handle, | |
1356 | gop[i].status); | |
1357 | } | |
1358 | BUG(); | |
1359 | } | |
1360 | } | |
1361 | ||
e9ce7cb6 WL |
1362 | for (i = 0; i < gop - queue->tx_unmap_ops; ++i) |
1363 | xenvif_idx_release(queue, pending_idx_release[i], | |
f53c3fe8 | 1364 | XEN_NETIF_RSP_OKAY); |
3e2234b3 ZK |
1365 | } |
1366 | ||
f53c3fe8 | 1367 | |
f942dc25 | 1368 | /* Called after netfront has transmitted */ |
e9ce7cb6 | 1369 | int xenvif_tx_action(struct xenvif_queue *queue, int budget) |
f942dc25 | 1370 | { |
ad7f402a | 1371 | unsigned nr_mops = 0, nr_cops = 0; |
f53c3fe8 | 1372 | int work_done, ret; |
f942dc25 | 1373 | |
e9ce7cb6 | 1374 | if (unlikely(!tx_work_todo(queue))) |
b3f980bd WL |
1375 | return 0; |
1376 | ||
e9ce7cb6 | 1377 | xenvif_tx_build_gops(queue, budget, &nr_cops, &nr_mops); |
f942dc25 | 1378 | |
bdab8275 | 1379 | if (nr_cops == 0) |
b3f980bd WL |
1380 | return 0; |
1381 | ||
e9ce7cb6 | 1382 | gnttab_batch_copy(queue->tx_copy_ops, nr_cops); |
2991397d | 1383 | if (nr_mops != 0) { |
e9ce7cb6 | 1384 | ret = gnttab_map_refs(queue->tx_map_ops, |
bdab8275 | 1385 | NULL, |
e9ce7cb6 | 1386 | queue->pages_to_map, |
bdab8275 | 1387 | nr_mops); |
2991397d JB |
1388 | if (ret) { |
1389 | unsigned int i; | |
1390 | ||
1391 | netdev_err(queue->vif->dev, "Map fail: nr %u ret %d\n", | |
1392 | nr_mops, ret); | |
1393 | for (i = 0; i < nr_mops; ++i) | |
1394 | WARN_ON_ONCE(queue->tx_map_ops[i].status == | |
1395 | GNTST_okay); | |
1396 | } | |
1397 | } | |
f942dc25 | 1398 | |
e9ce7cb6 | 1399 | work_done = xenvif_tx_submit(queue); |
f942dc25 | 1400 | |
b3f980bd | 1401 | return work_done; |
f942dc25 IC |
1402 | } |
1403 | ||
e9ce7cb6 | 1404 | static void xenvif_idx_release(struct xenvif_queue *queue, u16 pending_idx, |
7376419a | 1405 | u8 status) |
f942dc25 | 1406 | { |
f942dc25 | 1407 | struct pending_tx_info *pending_tx_info; |
f53c3fe8 | 1408 | pending_ring_idx_t index; |
f53c3fe8 | 1409 | unsigned long flags; |
2810e5b9 | 1410 | |
e9ce7cb6 | 1411 | pending_tx_info = &queue->pending_tx_info[pending_idx]; |
7fbb9d84 | 1412 | |
e9ce7cb6 | 1413 | spin_lock_irqsave(&queue->response_lock, flags); |
7fbb9d84 | 1414 | |
562abd39 PD |
1415 | make_tx_response(queue, &pending_tx_info->req, |
1416 | pending_tx_info->extra_count, status); | |
7fbb9d84 DV |
1417 | |
1418 | /* Release the pending index before pusing the Tx response so | |
1419 | * its available before a new Tx request is pushed by the | |
1420 | * frontend. | |
1421 | */ | |
1422 | index = pending_index(queue->pending_prod++); | |
e9ce7cb6 | 1423 | queue->pending_ring[index] = pending_idx; |
7fbb9d84 | 1424 | |
c8a4d299 | 1425 | push_tx_responses(queue); |
7fbb9d84 | 1426 | |
e9ce7cb6 | 1427 | spin_unlock_irqrestore(&queue->response_lock, flags); |
f942dc25 IC |
1428 | } |
1429 | ||
2810e5b9 | 1430 | |
e9ce7cb6 | 1431 | static void make_tx_response(struct xenvif_queue *queue, |
f942dc25 | 1432 | struct xen_netif_tx_request *txp, |
562abd39 | 1433 | unsigned int extra_count, |
f942dc25 IC |
1434 | s8 st) |
1435 | { | |
e9ce7cb6 | 1436 | RING_IDX i = queue->tx.rsp_prod_pvt; |
f942dc25 | 1437 | struct xen_netif_tx_response *resp; |
f942dc25 | 1438 | |
e9ce7cb6 | 1439 | resp = RING_GET_RESPONSE(&queue->tx, i); |
f942dc25 IC |
1440 | resp->id = txp->id; |
1441 | resp->status = st; | |
1442 | ||
562abd39 | 1443 | while (extra_count-- != 0) |
e9ce7cb6 | 1444 | RING_GET_RESPONSE(&queue->tx, ++i)->status = XEN_NETIF_RSP_NULL; |
f942dc25 | 1445 | |
e9ce7cb6 | 1446 | queue->tx.rsp_prod_pvt = ++i; |
f942dc25 IC |
1447 | } |
1448 | ||
c8a4d299 DV |
1449 | static void push_tx_responses(struct xenvif_queue *queue) |
1450 | { | |
1451 | int notify; | |
1452 | ||
1453 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&queue->tx, notify); | |
1454 | if (notify) | |
1455 | notify_remote_via_irq(queue->tx_irq); | |
1456 | } | |
1457 | ||
5834e72e | 1458 | static void xenvif_idx_unmap(struct xenvif_queue *queue, u16 pending_idx) |
f53c3fe8 ZK |
1459 | { |
1460 | int ret; | |
1461 | struct gnttab_unmap_grant_ref tx_unmap_op; | |
1462 | ||
1463 | gnttab_set_unmap_op(&tx_unmap_op, | |
e9ce7cb6 | 1464 | idx_to_kaddr(queue, pending_idx), |
f53c3fe8 | 1465 | GNTMAP_host_map, |
e9ce7cb6 WL |
1466 | queue->grant_tx_handle[pending_idx]); |
1467 | xenvif_grant_handle_reset(queue, pending_idx); | |
f53c3fe8 ZK |
1468 | |
1469 | ret = gnttab_unmap_refs(&tx_unmap_op, NULL, | |
e9ce7cb6 | 1470 | &queue->mmap_pages[pending_idx], 1); |
7aceb47a | 1471 | if (ret) { |
e9ce7cb6 | 1472 | netdev_err(queue->vif->dev, |
68946159 | 1473 | "Unmap fail: ret: %d pending_idx: %d host_addr: %llx handle: 0x%x status: %d\n", |
7aceb47a ZK |
1474 | ret, |
1475 | pending_idx, | |
1476 | tx_unmap_op.host_addr, | |
1477 | tx_unmap_op.handle, | |
1478 | tx_unmap_op.status); | |
1479 | BUG(); | |
1480 | } | |
f53c3fe8 ZK |
1481 | } |
1482 | ||
e9ce7cb6 | 1483 | static inline int tx_work_todo(struct xenvif_queue *queue) |
f942dc25 | 1484 | { |
e9ce7cb6 | 1485 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&queue->tx))) |
f942dc25 IC |
1486 | return 1; |
1487 | ||
1488 | return 0; | |
1489 | } | |
1490 | ||
e9ce7cb6 | 1491 | static inline bool tx_dealloc_work_todo(struct xenvif_queue *queue) |
f53c3fe8 | 1492 | { |
e9ce7cb6 | 1493 | return queue->dealloc_cons != queue->dealloc_prod; |
f53c3fe8 ZK |
1494 | } |
1495 | ||
4e15ee2c | 1496 | void xenvif_unmap_frontend_data_rings(struct xenvif_queue *queue) |
f942dc25 | 1497 | { |
e9ce7cb6 WL |
1498 | if (queue->tx.sring) |
1499 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1500 | queue->tx.sring); | |
1501 | if (queue->rx.sring) | |
1502 | xenbus_unmap_ring_vfree(xenvif_to_xenbus_device(queue->vif), | |
1503 | queue->rx.sring); | |
f942dc25 IC |
1504 | } |
1505 | ||
4e15ee2c PD |
1506 | int xenvif_map_frontend_data_rings(struct xenvif_queue *queue, |
1507 | grant_ref_t tx_ring_ref, | |
1508 | grant_ref_t rx_ring_ref) | |
f942dc25 | 1509 | { |
c9d63699 | 1510 | void *addr; |
f942dc25 IC |
1511 | struct xen_netif_tx_sring *txs; |
1512 | struct xen_netif_rx_sring *rxs; | |
9476654b | 1513 | RING_IDX rsp_prod, req_prod; |
bacc8daf | 1514 | int err; |
f942dc25 | 1515 | |
e9ce7cb6 | 1516 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1517 | &tx_ring_ref, 1, &addr); |
c9d63699 | 1518 | if (err) |
f942dc25 IC |
1519 | goto err; |
1520 | ||
c9d63699 | 1521 | txs = (struct xen_netif_tx_sring *)addr; |
9476654b PD |
1522 | rsp_prod = READ_ONCE(txs->rsp_prod); |
1523 | req_prod = READ_ONCE(txs->req_prod); | |
1524 | ||
1525 | BACK_RING_ATTACH(&queue->tx, txs, rsp_prod, XEN_PAGE_SIZE); | |
1526 | ||
1527 | err = -EIO; | |
1528 | if (req_prod - rsp_prod > RING_SIZE(&queue->tx)) | |
1529 | goto err; | |
f942dc25 | 1530 | |
e9ce7cb6 | 1531 | err = xenbus_map_ring_valloc(xenvif_to_xenbus_device(queue->vif), |
ccc9d90a | 1532 | &rx_ring_ref, 1, &addr); |
c9d63699 | 1533 | if (err) |
f942dc25 | 1534 | goto err; |
f942dc25 | 1535 | |
c9d63699 | 1536 | rxs = (struct xen_netif_rx_sring *)addr; |
9476654b PD |
1537 | rsp_prod = READ_ONCE(rxs->rsp_prod); |
1538 | req_prod = READ_ONCE(rxs->req_prod); | |
1539 | ||
1540 | BACK_RING_ATTACH(&queue->rx, rxs, rsp_prod, XEN_PAGE_SIZE); | |
1541 | ||
1542 | err = -EIO; | |
1543 | if (req_prod - rsp_prod > RING_SIZE(&queue->rx)) | |
1544 | goto err; | |
f942dc25 IC |
1545 | |
1546 | return 0; | |
1547 | ||
1548 | err: | |
4e15ee2c | 1549 | xenvif_unmap_frontend_data_rings(queue); |
f942dc25 IC |
1550 | return err; |
1551 | } | |
1552 | ||
a64bd934 WL |
1553 | static bool xenvif_dealloc_kthread_should_stop(struct xenvif_queue *queue) |
1554 | { | |
1555 | /* Dealloc thread must remain running until all inflight | |
1556 | * packets complete. | |
1557 | */ | |
1558 | return kthread_should_stop() && | |
1559 | !atomic_read(&queue->inflight_packets); | |
1560 | } | |
1561 | ||
f53c3fe8 ZK |
1562 | int xenvif_dealloc_kthread(void *data) |
1563 | { | |
e9ce7cb6 | 1564 | struct xenvif_queue *queue = data; |
f53c3fe8 | 1565 | |
a64bd934 | 1566 | for (;;) { |
e9ce7cb6 WL |
1567 | wait_event_interruptible(queue->dealloc_wq, |
1568 | tx_dealloc_work_todo(queue) || | |
a64bd934 WL |
1569 | xenvif_dealloc_kthread_should_stop(queue)); |
1570 | if (xenvif_dealloc_kthread_should_stop(queue)) | |
f53c3fe8 ZK |
1571 | break; |
1572 | ||
e9ce7cb6 | 1573 | xenvif_tx_dealloc_action(queue); |
f53c3fe8 ZK |
1574 | cond_resched(); |
1575 | } | |
1576 | ||
1577 | /* Unmap anything remaining*/ | |
e9ce7cb6 WL |
1578 | if (tx_dealloc_work_todo(queue)) |
1579 | xenvif_tx_dealloc_action(queue); | |
f53c3fe8 ZK |
1580 | |
1581 | return 0; | |
1582 | } | |
1583 | ||
4e15ee2c PD |
1584 | static void make_ctrl_response(struct xenvif *vif, |
1585 | const struct xen_netif_ctrl_request *req, | |
1586 | u32 status, u32 data) | |
1587 | { | |
1588 | RING_IDX idx = vif->ctrl.rsp_prod_pvt; | |
1589 | struct xen_netif_ctrl_response rsp = { | |
1590 | .id = req->id, | |
1591 | .type = req->type, | |
1592 | .status = status, | |
1593 | .data = data, | |
1594 | }; | |
1595 | ||
1596 | *RING_GET_RESPONSE(&vif->ctrl, idx) = rsp; | |
1597 | vif->ctrl.rsp_prod_pvt = ++idx; | |
1598 | } | |
1599 | ||
1600 | static void push_ctrl_response(struct xenvif *vif) | |
1601 | { | |
1602 | int notify; | |
1603 | ||
1604 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&vif->ctrl, notify); | |
1605 | if (notify) | |
1606 | notify_remote_via_irq(vif->ctrl_irq); | |
1607 | } | |
1608 | ||
1609 | static void process_ctrl_request(struct xenvif *vif, | |
1610 | const struct xen_netif_ctrl_request *req) | |
1611 | { | |
40d8abde PD |
1612 | u32 status = XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED; |
1613 | u32 data = 0; | |
1614 | ||
1615 | switch (req->type) { | |
1616 | case XEN_NETIF_CTRL_TYPE_SET_HASH_ALGORITHM: | |
1617 | status = xenvif_set_hash_alg(vif, req->data[0]); | |
1618 | break; | |
1619 | ||
1620 | case XEN_NETIF_CTRL_TYPE_GET_HASH_FLAGS: | |
1621 | status = xenvif_get_hash_flags(vif, &data); | |
1622 | break; | |
1623 | ||
1624 | case XEN_NETIF_CTRL_TYPE_SET_HASH_FLAGS: | |
1625 | status = xenvif_set_hash_flags(vif, req->data[0]); | |
1626 | break; | |
1627 | ||
1628 | case XEN_NETIF_CTRL_TYPE_SET_HASH_KEY: | |
1629 | status = xenvif_set_hash_key(vif, req->data[0], | |
1630 | req->data[1]); | |
1631 | break; | |
1632 | ||
1633 | case XEN_NETIF_CTRL_TYPE_GET_HASH_MAPPING_SIZE: | |
1634 | status = XEN_NETIF_CTRL_STATUS_SUCCESS; | |
1635 | data = XEN_NETBK_MAX_HASH_MAPPING_SIZE; | |
1636 | break; | |
1637 | ||
1638 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING_SIZE: | |
1639 | status = xenvif_set_hash_mapping_size(vif, | |
1640 | req->data[0]); | |
1641 | break; | |
1642 | ||
1643 | case XEN_NETIF_CTRL_TYPE_SET_HASH_MAPPING: | |
1644 | status = xenvif_set_hash_mapping(vif, req->data[0], | |
1645 | req->data[1], | |
1646 | req->data[2]); | |
1647 | break; | |
1648 | ||
1649 | default: | |
1650 | break; | |
1651 | } | |
1652 | ||
1653 | make_ctrl_response(vif, req, status, data); | |
4e15ee2c PD |
1654 | push_ctrl_response(vif); |
1655 | } | |
1656 | ||
1657 | static void xenvif_ctrl_action(struct xenvif *vif) | |
1658 | { | |
1659 | for (;;) { | |
1660 | RING_IDX req_prod, req_cons; | |
1661 | ||
1662 | req_prod = vif->ctrl.sring->req_prod; | |
1663 | req_cons = vif->ctrl.req_cons; | |
1664 | ||
1665 | /* Make sure we can see requests before we process them. */ | |
1666 | rmb(); | |
1667 | ||
1668 | if (req_cons == req_prod) | |
1669 | break; | |
1670 | ||
1671 | while (req_cons != req_prod) { | |
1672 | struct xen_netif_ctrl_request req; | |
1673 | ||
1674 | RING_COPY_REQUEST(&vif->ctrl, req_cons, &req); | |
1675 | req_cons++; | |
1676 | ||
1677 | process_ctrl_request(vif, &req); | |
1678 | } | |
1679 | ||
1680 | vif->ctrl.req_cons = req_cons; | |
1681 | vif->ctrl.sring->req_event = req_cons + 1; | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | static bool xenvif_ctrl_work_todo(struct xenvif *vif) | |
1686 | { | |
1687 | if (likely(RING_HAS_UNCONSUMED_REQUESTS(&vif->ctrl))) | |
d3e2a25b | 1688 | return true; |
4e15ee2c | 1689 | |
d3e2a25b | 1690 | return false; |
4e15ee2c PD |
1691 | } |
1692 | ||
0364a882 | 1693 | irqreturn_t xenvif_ctrl_irq_fn(int irq, void *data) |
4e15ee2c PD |
1694 | { |
1695 | struct xenvif *vif = data; | |
23025393 | 1696 | unsigned int eoi_flag = XEN_EOI_FLAG_SPURIOUS; |
4e15ee2c | 1697 | |
23025393 | 1698 | while (xenvif_ctrl_work_todo(vif)) { |
0364a882 | 1699 | xenvif_ctrl_action(vif); |
23025393 JG |
1700 | eoi_flag = 0; |
1701 | } | |
1702 | ||
1703 | xen_irq_lateeoi(irq, eoi_flag); | |
4e15ee2c | 1704 | |
0364a882 | 1705 | return IRQ_HANDLED; |
4e15ee2c PD |
1706 | } |
1707 | ||
f942dc25 IC |
1708 | static int __init netback_init(void) |
1709 | { | |
f942dc25 | 1710 | int rc = 0; |
f942dc25 | 1711 | |
2a14b244 | 1712 | if (!xen_domain()) |
f942dc25 IC |
1713 | return -ENODEV; |
1714 | ||
56dd5af9 | 1715 | /* Allow as many queues as there are CPUs but max. 8 if user has not |
4c82ac3c WL |
1716 | * specified a value. |
1717 | */ | |
1718 | if (xenvif_max_queues == 0) | |
56dd5af9 JG |
1719 | xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
1720 | num_online_cpus()); | |
8d3d53b3 | 1721 | |
37641494 | 1722 | if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) { |
383eda32 JP |
1723 | pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n", |
1724 | fatal_skb_slots, XEN_NETBK_LEGACY_SLOTS_MAX); | |
37641494 | 1725 | fatal_skb_slots = XEN_NETBK_LEGACY_SLOTS_MAX; |
2810e5b9 WL |
1726 | } |
1727 | ||
f942dc25 IC |
1728 | rc = xenvif_xenbus_init(); |
1729 | if (rc) | |
1730 | goto failed_init; | |
1731 | ||
f51de243 ZK |
1732 | #ifdef CONFIG_DEBUG_FS |
1733 | xen_netback_dbg_root = debugfs_create_dir("xen-netback", NULL); | |
f51de243 ZK |
1734 | #endif /* CONFIG_DEBUG_FS */ |
1735 | ||
f942dc25 IC |
1736 | return 0; |
1737 | ||
1738 | failed_init: | |
f942dc25 | 1739 | return rc; |
f942dc25 IC |
1740 | } |
1741 | ||
1742 | module_init(netback_init); | |
1743 | ||
b103f358 WL |
1744 | static void __exit netback_fini(void) |
1745 | { | |
f51de243 | 1746 | #ifdef CONFIG_DEBUG_FS |
aad06d11 | 1747 | debugfs_remove_recursive(xen_netback_dbg_root); |
f51de243 | 1748 | #endif /* CONFIG_DEBUG_FS */ |
b103f358 | 1749 | xenvif_xenbus_fini(); |
b103f358 WL |
1750 | } |
1751 | module_exit(netback_fini); | |
1752 | ||
f942dc25 | 1753 | MODULE_LICENSE("Dual BSD/GPL"); |
f984cec6 | 1754 | MODULE_ALIAS("xen-backend:vif"); |