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839fcaba MT |
1 | /* |
2 | * Copyright (c) 2006 Mellanox Technologies. All rights reserved | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | * $Id$ | |
33 | */ | |
34 | ||
35 | #include <rdma/ib_cm.h> | |
36 | #include <rdma/ib_cache.h> | |
37 | #include <net/dst.h> | |
38 | #include <net/icmp.h> | |
39 | #include <linux/icmpv6.h> | |
40 | ||
41 | #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA | |
42 | static int data_debug_level; | |
43 | ||
44 | module_param_named(cm_data_debug_level, data_debug_level, int, 0644); | |
45 | MODULE_PARM_DESC(cm_data_debug_level, | |
46 | "Enable data path debug tracing for connected mode if > 0"); | |
47 | #endif | |
48 | ||
49 | #include "ipoib.h" | |
50 | ||
51 | #define IPOIB_CM_IETF_ID 0x1000000000000000ULL | |
52 | ||
53 | #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ) | |
54 | #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ) | |
55 | #define IPOIB_CM_RX_DELAY (3 * 256 * HZ) | |
56 | #define IPOIB_CM_RX_UPDATE_MASK (0x3) | |
57 | ||
58 | struct ipoib_cm_id { | |
59 | struct ib_cm_id *id; | |
60 | int flags; | |
61 | u32 remote_qpn; | |
62 | u32 remote_mtu; | |
63 | }; | |
64 | ||
65 | static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, | |
66 | struct ib_cm_event *event); | |
67 | ||
1812063b | 68 | static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags, |
839fcaba MT |
69 | u64 mapping[IPOIB_CM_RX_SG]) |
70 | { | |
71 | int i; | |
72 | ||
73 | ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); | |
74 | ||
1812063b | 75 | for (i = 0; i < frags; ++i) |
839fcaba MT |
76 | ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); |
77 | } | |
78 | ||
79 | static int ipoib_cm_post_receive(struct net_device *dev, int id) | |
80 | { | |
81 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
82 | struct ib_recv_wr *bad_wr; | |
83 | int i, ret; | |
84 | ||
85 | priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ; | |
86 | ||
87 | for (i = 0; i < IPOIB_CM_RX_SG; ++i) | |
88 | priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i]; | |
89 | ||
90 | ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr); | |
91 | if (unlikely(ret)) { | |
92 | ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret); | |
1812063b MT |
93 | ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, |
94 | priv->cm.srq_ring[id].mapping); | |
839fcaba MT |
95 | dev_kfree_skb_any(priv->cm.srq_ring[id].skb); |
96 | priv->cm.srq_ring[id].skb = NULL; | |
97 | } | |
98 | ||
99 | return ret; | |
100 | } | |
101 | ||
1812063b MT |
102 | static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags, |
103 | u64 mapping[IPOIB_CM_RX_SG]) | |
839fcaba MT |
104 | { |
105 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
106 | struct sk_buff *skb; | |
107 | int i; | |
108 | ||
109 | skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12); | |
110 | if (unlikely(!skb)) | |
1812063b | 111 | return NULL; |
839fcaba MT |
112 | |
113 | /* | |
114 | * IPoIB adds a 4 byte header. So we need 12 more bytes to align the | |
115 | * IP header to a multiple of 16. | |
116 | */ | |
117 | skb_reserve(skb, 12); | |
118 | ||
119 | mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE, | |
120 | DMA_FROM_DEVICE); | |
121 | if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) { | |
122 | dev_kfree_skb_any(skb); | |
1812063b | 123 | return NULL; |
839fcaba MT |
124 | } |
125 | ||
1812063b | 126 | for (i = 0; i < frags; i++) { |
839fcaba MT |
127 | struct page *page = alloc_page(GFP_ATOMIC); |
128 | ||
129 | if (!page) | |
130 | goto partial_error; | |
131 | skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE); | |
132 | ||
133 | mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page, | |
6371ea3d | 134 | 0, PAGE_SIZE, DMA_FROM_DEVICE); |
839fcaba MT |
135 | if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1]))) |
136 | goto partial_error; | |
137 | } | |
138 | ||
139 | priv->cm.srq_ring[id].skb = skb; | |
1812063b | 140 | return skb; |
839fcaba MT |
141 | |
142 | partial_error: | |
143 | ||
144 | ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE); | |
145 | ||
146 | for (; i >= 0; --i) | |
147 | ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE); | |
148 | ||
8a2e65f8 | 149 | dev_kfree_skb_any(skb); |
1812063b | 150 | return NULL; |
839fcaba MT |
151 | } |
152 | ||
153 | static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev, | |
154 | struct ipoib_cm_rx *p) | |
155 | { | |
156 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
157 | struct ib_qp_init_attr attr = { | |
158 | .send_cq = priv->cq, /* does not matter, we never send anything */ | |
159 | .recv_cq = priv->cq, | |
160 | .srq = priv->cm.srq, | |
161 | .cap.max_send_wr = 1, /* FIXME: 0 Seems not to work */ | |
162 | .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */ | |
163 | .sq_sig_type = IB_SIGNAL_ALL_WR, | |
164 | .qp_type = IB_QPT_RC, | |
165 | .qp_context = p, | |
166 | }; | |
167 | return ib_create_qp(priv->pd, &attr); | |
168 | } | |
169 | ||
170 | static int ipoib_cm_modify_rx_qp(struct net_device *dev, | |
171 | struct ib_cm_id *cm_id, struct ib_qp *qp, | |
172 | unsigned psn) | |
173 | { | |
174 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
175 | struct ib_qp_attr qp_attr; | |
176 | int qp_attr_mask, ret; | |
177 | ||
178 | qp_attr.qp_state = IB_QPS_INIT; | |
179 | ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); | |
180 | if (ret) { | |
181 | ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret); | |
182 | return ret; | |
183 | } | |
184 | ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); | |
185 | if (ret) { | |
186 | ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret); | |
187 | return ret; | |
188 | } | |
189 | qp_attr.qp_state = IB_QPS_RTR; | |
190 | ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); | |
191 | if (ret) { | |
192 | ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); | |
193 | return ret; | |
194 | } | |
195 | qp_attr.rq_psn = psn; | |
196 | ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); | |
197 | if (ret) { | |
198 | ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); | |
199 | return ret; | |
200 | } | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id, | |
205 | struct ib_qp *qp, struct ib_cm_req_event_param *req, | |
206 | unsigned psn) | |
207 | { | |
208 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
209 | struct ipoib_cm_data data = {}; | |
210 | struct ib_cm_rep_param rep = {}; | |
211 | ||
212 | data.qpn = cpu_to_be32(priv->qp->qp_num); | |
213 | data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); | |
214 | ||
215 | rep.private_data = &data; | |
216 | rep.private_data_len = sizeof data; | |
217 | rep.flow_control = 0; | |
218 | rep.rnr_retry_count = req->rnr_retry_count; | |
219 | rep.target_ack_delay = 20; /* FIXME */ | |
220 | rep.srq = 1; | |
221 | rep.qp_num = qp->qp_num; | |
222 | rep.starting_psn = psn; | |
223 | return ib_send_cm_rep(cm_id, &rep); | |
224 | } | |
225 | ||
226 | static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
227 | { | |
228 | struct net_device *dev = cm_id->context; | |
229 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
230 | struct ipoib_cm_rx *p; | |
231 | unsigned long flags; | |
232 | unsigned psn; | |
233 | int ret; | |
234 | ||
235 | ipoib_dbg(priv, "REQ arrived\n"); | |
236 | p = kzalloc(sizeof *p, GFP_KERNEL); | |
237 | if (!p) | |
238 | return -ENOMEM; | |
239 | p->dev = dev; | |
240 | p->id = cm_id; | |
241 | p->qp = ipoib_cm_create_rx_qp(dev, p); | |
242 | if (IS_ERR(p->qp)) { | |
243 | ret = PTR_ERR(p->qp); | |
244 | goto err_qp; | |
245 | } | |
246 | ||
247 | psn = random32() & 0xffffff; | |
248 | ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn); | |
249 | if (ret) | |
250 | goto err_modify; | |
251 | ||
252 | ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn); | |
253 | if (ret) { | |
254 | ipoib_warn(priv, "failed to send REP: %d\n", ret); | |
255 | goto err_rep; | |
256 | } | |
257 | ||
258 | cm_id->context = p; | |
259 | p->jiffies = jiffies; | |
260 | spin_lock_irqsave(&priv->lock, flags); | |
261 | list_add(&p->list, &priv->cm.passive_ids); | |
262 | spin_unlock_irqrestore(&priv->lock, flags); | |
263 | queue_delayed_work(ipoib_workqueue, | |
264 | &priv->cm.stale_task, IPOIB_CM_RX_DELAY); | |
265 | return 0; | |
266 | ||
267 | err_rep: | |
268 | err_modify: | |
269 | ib_destroy_qp(p->qp); | |
270 | err_qp: | |
271 | kfree(p); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id, | |
276 | struct ib_cm_event *event) | |
277 | { | |
278 | struct ipoib_cm_rx *p; | |
279 | struct ipoib_dev_priv *priv; | |
280 | unsigned long flags; | |
281 | int ret; | |
282 | ||
283 | switch (event->event) { | |
284 | case IB_CM_REQ_RECEIVED: | |
285 | return ipoib_cm_req_handler(cm_id, event); | |
286 | case IB_CM_DREQ_RECEIVED: | |
287 | p = cm_id->context; | |
288 | ib_send_cm_drep(cm_id, NULL, 0); | |
289 | /* Fall through */ | |
290 | case IB_CM_REJ_RECEIVED: | |
291 | p = cm_id->context; | |
292 | priv = netdev_priv(p->dev); | |
293 | spin_lock_irqsave(&priv->lock, flags); | |
294 | if (list_empty(&p->list)) | |
295 | ret = 0; /* Connection is going away already. */ | |
296 | else { | |
297 | list_del_init(&p->list); | |
298 | ret = -ECONNRESET; | |
299 | } | |
300 | spin_unlock_irqrestore(&priv->lock, flags); | |
301 | if (ret) { | |
302 | ib_destroy_qp(p->qp); | |
303 | kfree(p); | |
304 | return ret; | |
305 | } | |
306 | return 0; | |
307 | default: | |
308 | return 0; | |
309 | } | |
310 | } | |
311 | /* Adjust length of skb with fragments to match received data */ | |
312 | static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space, | |
1812063b | 313 | unsigned int length, struct sk_buff *toskb) |
839fcaba MT |
314 | { |
315 | int i, num_frags; | |
316 | unsigned int size; | |
317 | ||
318 | /* put header into skb */ | |
319 | size = min(length, hdr_space); | |
320 | skb->tail += size; | |
321 | skb->len += size; | |
322 | length -= size; | |
323 | ||
324 | num_frags = skb_shinfo(skb)->nr_frags; | |
325 | for (i = 0; i < num_frags; i++) { | |
326 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
327 | ||
328 | if (length == 0) { | |
329 | /* don't need this page */ | |
1812063b | 330 | skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE); |
839fcaba MT |
331 | --skb_shinfo(skb)->nr_frags; |
332 | } else { | |
333 | size = min(length, (unsigned) PAGE_SIZE); | |
334 | ||
335 | frag->size = size; | |
336 | skb->data_len += size; | |
337 | skb->truesize += size; | |
338 | skb->len += size; | |
339 | length -= size; | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc) | |
345 | { | |
346 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
347 | unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ; | |
1812063b | 348 | struct sk_buff *skb, *newskb; |
839fcaba MT |
349 | struct ipoib_cm_rx *p; |
350 | unsigned long flags; | |
351 | u64 mapping[IPOIB_CM_RX_SG]; | |
1812063b | 352 | int frags; |
839fcaba MT |
353 | |
354 | ipoib_dbg_data(priv, "cm recv completion: id %d, op %d, status: %d\n", | |
355 | wr_id, wc->opcode, wc->status); | |
356 | ||
357 | if (unlikely(wr_id >= ipoib_recvq_size)) { | |
358 | ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n", | |
359 | wr_id, ipoib_recvq_size); | |
360 | return; | |
361 | } | |
362 | ||
363 | skb = priv->cm.srq_ring[wr_id].skb; | |
364 | ||
365 | if (unlikely(wc->status != IB_WC_SUCCESS)) { | |
366 | ipoib_dbg(priv, "cm recv error " | |
367 | "(status=%d, wrid=%d vend_err %x)\n", | |
368 | wc->status, wr_id, wc->vendor_err); | |
369 | ++priv->stats.rx_dropped; | |
370 | goto repost; | |
371 | } | |
372 | ||
373 | if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) { | |
374 | p = wc->qp->qp_context; | |
375 | if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) { | |
376 | spin_lock_irqsave(&priv->lock, flags); | |
377 | p->jiffies = jiffies; | |
378 | /* Move this entry to list head, but do | |
379 | * not re-add it if it has been removed. */ | |
380 | if (!list_empty(&p->list)) | |
381 | list_move(&p->list, &priv->cm.passive_ids); | |
382 | spin_unlock_irqrestore(&priv->lock, flags); | |
383 | queue_delayed_work(ipoib_workqueue, | |
384 | &priv->cm.stale_task, IPOIB_CM_RX_DELAY); | |
385 | } | |
386 | } | |
387 | ||
1812063b MT |
388 | frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len, |
389 | (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE; | |
390 | ||
391 | newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping); | |
392 | if (unlikely(!newskb)) { | |
839fcaba MT |
393 | /* |
394 | * If we can't allocate a new RX buffer, dump | |
395 | * this packet and reuse the old buffer. | |
396 | */ | |
397 | ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id); | |
398 | ++priv->stats.rx_dropped; | |
399 | goto repost; | |
400 | } | |
401 | ||
1812063b MT |
402 | ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping); |
403 | memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping); | |
839fcaba MT |
404 | |
405 | ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n", | |
406 | wc->byte_len, wc->slid); | |
407 | ||
1812063b | 408 | skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb); |
839fcaba MT |
409 | |
410 | skb->protocol = ((struct ipoib_header *) skb->data)->proto; | |
459a98ed | 411 | skb_reset_mac_header(skb); |
839fcaba MT |
412 | skb_pull(skb, IPOIB_ENCAP_LEN); |
413 | ||
414 | dev->last_rx = jiffies; | |
415 | ++priv->stats.rx_packets; | |
416 | priv->stats.rx_bytes += skb->len; | |
417 | ||
418 | skb->dev = dev; | |
419 | /* XXX get correct PACKET_ type here */ | |
420 | skb->pkt_type = PACKET_HOST; | |
421 | netif_rx_ni(skb); | |
422 | ||
423 | repost: | |
424 | if (unlikely(ipoib_cm_post_receive(dev, wr_id))) | |
425 | ipoib_warn(priv, "ipoib_cm_post_receive failed " | |
426 | "for buf %d\n", wr_id); | |
427 | } | |
428 | ||
429 | static inline int post_send(struct ipoib_dev_priv *priv, | |
430 | struct ipoib_cm_tx *tx, | |
431 | unsigned int wr_id, | |
432 | u64 addr, int len) | |
433 | { | |
434 | struct ib_send_wr *bad_wr; | |
435 | ||
436 | priv->tx_sge.addr = addr; | |
437 | priv->tx_sge.length = len; | |
438 | ||
439 | priv->tx_wr.wr_id = wr_id; | |
440 | ||
441 | return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr); | |
442 | } | |
443 | ||
444 | void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx) | |
445 | { | |
446 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
447 | struct ipoib_tx_buf *tx_req; | |
448 | u64 addr; | |
449 | ||
450 | if (unlikely(skb->len > tx->mtu)) { | |
451 | ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n", | |
452 | skb->len, tx->mtu); | |
453 | ++priv->stats.tx_dropped; | |
454 | ++priv->stats.tx_errors; | |
77d8e1ef | 455 | ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN); |
839fcaba MT |
456 | return; |
457 | } | |
458 | ||
459 | ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n", | |
460 | tx->tx_head, skb->len, tx->qp->qp_num); | |
461 | ||
462 | /* | |
463 | * We put the skb into the tx_ring _before_ we call post_send() | |
464 | * because it's entirely possible that the completion handler will | |
465 | * run before we execute anything after the post_send(). That | |
466 | * means we have to make sure everything is properly recorded and | |
467 | * our state is consistent before we call post_send(). | |
468 | */ | |
469 | tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)]; | |
470 | tx_req->skb = skb; | |
471 | addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE); | |
472 | if (unlikely(ib_dma_mapping_error(priv->ca, addr))) { | |
473 | ++priv->stats.tx_errors; | |
474 | dev_kfree_skb_any(skb); | |
475 | return; | |
476 | } | |
477 | ||
478 | tx_req->mapping = addr; | |
479 | ||
480 | if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), | |
481 | addr, skb->len))) { | |
482 | ipoib_warn(priv, "post_send failed\n"); | |
483 | ++priv->stats.tx_errors; | |
484 | ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE); | |
485 | dev_kfree_skb_any(skb); | |
486 | } else { | |
487 | dev->trans_start = jiffies; | |
488 | ++tx->tx_head; | |
489 | ||
490 | if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) { | |
491 | ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", | |
492 | tx->qp->qp_num); | |
493 | netif_stop_queue(dev); | |
494 | set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags); | |
495 | } | |
496 | } | |
497 | } | |
498 | ||
499 | static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx, | |
500 | struct ib_wc *wc) | |
501 | { | |
502 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
503 | unsigned int wr_id = wc->wr_id; | |
504 | struct ipoib_tx_buf *tx_req; | |
505 | unsigned long flags; | |
506 | ||
507 | ipoib_dbg_data(priv, "cm send completion: id %d, op %d, status: %d\n", | |
508 | wr_id, wc->opcode, wc->status); | |
509 | ||
510 | if (unlikely(wr_id >= ipoib_sendq_size)) { | |
511 | ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n", | |
512 | wr_id, ipoib_sendq_size); | |
513 | return; | |
514 | } | |
515 | ||
516 | tx_req = &tx->tx_ring[wr_id]; | |
517 | ||
518 | ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE); | |
519 | ||
520 | /* FIXME: is this right? Shouldn't we only increment on success? */ | |
521 | ++priv->stats.tx_packets; | |
522 | priv->stats.tx_bytes += tx_req->skb->len; | |
523 | ||
524 | dev_kfree_skb_any(tx_req->skb); | |
525 | ||
526 | spin_lock_irqsave(&priv->tx_lock, flags); | |
527 | ++tx->tx_tail; | |
528 | if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) && | |
529 | tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) { | |
530 | clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags); | |
531 | netif_wake_queue(dev); | |
532 | } | |
533 | ||
534 | if (wc->status != IB_WC_SUCCESS && | |
535 | wc->status != IB_WC_WR_FLUSH_ERR) { | |
536 | struct ipoib_neigh *neigh; | |
537 | ||
538 | ipoib_dbg(priv, "failed cm send event " | |
539 | "(status=%d, wrid=%d vend_err %x)\n", | |
540 | wc->status, wr_id, wc->vendor_err); | |
541 | ||
542 | spin_lock(&priv->lock); | |
543 | neigh = tx->neigh; | |
544 | ||
545 | if (neigh) { | |
546 | neigh->cm = NULL; | |
547 | list_del(&neigh->list); | |
548 | if (neigh->ah) | |
549 | ipoib_put_ah(neigh->ah); | |
550 | ipoib_neigh_free(dev, neigh); | |
551 | ||
552 | tx->neigh = NULL; | |
553 | } | |
554 | ||
555 | /* queue would be re-started anyway when TX is destroyed, | |
556 | * but it makes sense to do it ASAP here. */ | |
557 | if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) | |
558 | netif_wake_queue(dev); | |
559 | ||
560 | if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { | |
561 | list_move(&tx->list, &priv->cm.reap_list); | |
562 | queue_work(ipoib_workqueue, &priv->cm.reap_task); | |
563 | } | |
564 | ||
565 | clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags); | |
566 | ||
567 | spin_unlock(&priv->lock); | |
568 | } | |
569 | ||
570 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
571 | } | |
572 | ||
573 | static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr) | |
574 | { | |
575 | struct ipoib_cm_tx *tx = tx_ptr; | |
576 | int n, i; | |
577 | ||
578 | ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
579 | do { | |
580 | n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc); | |
581 | for (i = 0; i < n; ++i) | |
582 | ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i); | |
583 | } while (n == IPOIB_NUM_WC); | |
584 | } | |
585 | ||
586 | int ipoib_cm_dev_open(struct net_device *dev) | |
587 | { | |
588 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
589 | int ret; | |
590 | ||
591 | if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) | |
592 | return 0; | |
593 | ||
594 | priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev); | |
595 | if (IS_ERR(priv->cm.id)) { | |
596 | printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name); | |
597 | return IS_ERR(priv->cm.id); | |
598 | } | |
599 | ||
600 | ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num), | |
601 | 0, NULL); | |
602 | if (ret) { | |
603 | printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name, | |
604 | IPOIB_CM_IETF_ID | priv->qp->qp_num); | |
605 | ib_destroy_cm_id(priv->cm.id); | |
606 | return ret; | |
607 | } | |
608 | return 0; | |
609 | } | |
610 | ||
611 | void ipoib_cm_dev_stop(struct net_device *dev) | |
612 | { | |
613 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
614 | struct ipoib_cm_rx *p; | |
615 | unsigned long flags; | |
616 | ||
617 | if (!IPOIB_CM_SUPPORTED(dev->dev_addr)) | |
618 | return; | |
619 | ||
620 | ib_destroy_cm_id(priv->cm.id); | |
621 | spin_lock_irqsave(&priv->lock, flags); | |
622 | while (!list_empty(&priv->cm.passive_ids)) { | |
623 | p = list_entry(priv->cm.passive_ids.next, typeof(*p), list); | |
624 | list_del_init(&p->list); | |
625 | spin_unlock_irqrestore(&priv->lock, flags); | |
626 | ib_destroy_cm_id(p->id); | |
627 | ib_destroy_qp(p->qp); | |
628 | kfree(p); | |
629 | spin_lock_irqsave(&priv->lock, flags); | |
630 | } | |
631 | spin_unlock_irqrestore(&priv->lock, flags); | |
632 | ||
633 | cancel_delayed_work(&priv->cm.stale_task); | |
634 | } | |
635 | ||
636 | static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event) | |
637 | { | |
638 | struct ipoib_cm_tx *p = cm_id->context; | |
639 | struct ipoib_dev_priv *priv = netdev_priv(p->dev); | |
640 | struct ipoib_cm_data *data = event->private_data; | |
641 | struct sk_buff_head skqueue; | |
642 | struct ib_qp_attr qp_attr; | |
643 | int qp_attr_mask, ret; | |
644 | struct sk_buff *skb; | |
645 | unsigned long flags; | |
646 | ||
647 | p->mtu = be32_to_cpu(data->mtu); | |
648 | ||
649 | if (p->mtu < priv->dev->mtu + IPOIB_ENCAP_LEN) { | |
650 | ipoib_warn(priv, "Rejecting connection: mtu %d < device mtu %d + 4\n", | |
651 | p->mtu, priv->dev->mtu); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | qp_attr.qp_state = IB_QPS_RTR; | |
656 | ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); | |
657 | if (ret) { | |
658 | ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret); | |
659 | return ret; | |
660 | } | |
661 | ||
662 | qp_attr.rq_psn = 0 /* FIXME */; | |
663 | ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); | |
664 | if (ret) { | |
665 | ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret); | |
666 | return ret; | |
667 | } | |
668 | ||
669 | qp_attr.qp_state = IB_QPS_RTS; | |
670 | ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask); | |
671 | if (ret) { | |
672 | ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret); | |
673 | return ret; | |
674 | } | |
675 | ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask); | |
676 | if (ret) { | |
677 | ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret); | |
678 | return ret; | |
679 | } | |
680 | ||
681 | skb_queue_head_init(&skqueue); | |
682 | ||
683 | spin_lock_irqsave(&priv->lock, flags); | |
684 | set_bit(IPOIB_FLAG_OPER_UP, &p->flags); | |
685 | if (p->neigh) | |
686 | while ((skb = __skb_dequeue(&p->neigh->queue))) | |
687 | __skb_queue_tail(&skqueue, skb); | |
688 | spin_unlock_irqrestore(&priv->lock, flags); | |
689 | ||
690 | while ((skb = __skb_dequeue(&skqueue))) { | |
691 | skb->dev = p->dev; | |
692 | if (dev_queue_xmit(skb)) | |
693 | ipoib_warn(priv, "dev_queue_xmit failed " | |
694 | "to requeue packet\n"); | |
695 | } | |
696 | ||
697 | ret = ib_send_cm_rtu(cm_id, NULL, 0); | |
698 | if (ret) { | |
699 | ipoib_warn(priv, "failed to send RTU: %d\n", ret); | |
700 | return ret; | |
701 | } | |
702 | return 0; | |
703 | } | |
704 | ||
705 | static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq) | |
706 | { | |
707 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
708 | struct ib_qp_init_attr attr = {}; | |
709 | attr.recv_cq = priv->cq; | |
710 | attr.srq = priv->cm.srq; | |
711 | attr.cap.max_send_wr = ipoib_sendq_size; | |
712 | attr.cap.max_send_sge = 1; | |
713 | attr.sq_sig_type = IB_SIGNAL_ALL_WR; | |
714 | attr.qp_type = IB_QPT_RC; | |
715 | attr.send_cq = cq; | |
716 | return ib_create_qp(priv->pd, &attr); | |
717 | } | |
718 | ||
719 | static int ipoib_cm_send_req(struct net_device *dev, | |
720 | struct ib_cm_id *id, struct ib_qp *qp, | |
721 | u32 qpn, | |
722 | struct ib_sa_path_rec *pathrec) | |
723 | { | |
724 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
725 | struct ipoib_cm_data data = {}; | |
726 | struct ib_cm_req_param req = {}; | |
727 | ||
728 | data.qpn = cpu_to_be32(priv->qp->qp_num); | |
729 | data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE); | |
730 | ||
731 | req.primary_path = pathrec; | |
732 | req.alternate_path = NULL; | |
733 | req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn); | |
734 | req.qp_num = qp->qp_num; | |
735 | req.qp_type = qp->qp_type; | |
736 | req.private_data = &data; | |
737 | req.private_data_len = sizeof data; | |
738 | req.flow_control = 0; | |
739 | ||
740 | req.starting_psn = 0; /* FIXME */ | |
741 | ||
742 | /* | |
743 | * Pick some arbitrary defaults here; we could make these | |
744 | * module parameters if anyone cared about setting them. | |
745 | */ | |
746 | req.responder_resources = 4; | |
747 | req.remote_cm_response_timeout = 20; | |
748 | req.local_cm_response_timeout = 20; | |
749 | req.retry_count = 0; /* RFC draft warns against retries */ | |
750 | req.rnr_retry_count = 0; /* RFC draft warns against retries */ | |
751 | req.max_cm_retries = 15; | |
752 | req.srq = 1; | |
753 | return ib_send_cm_req(id, &req); | |
754 | } | |
755 | ||
756 | static int ipoib_cm_modify_tx_init(struct net_device *dev, | |
757 | struct ib_cm_id *cm_id, struct ib_qp *qp) | |
758 | { | |
759 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
760 | struct ib_qp_attr qp_attr; | |
761 | int qp_attr_mask, ret; | |
762 | ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index); | |
763 | if (ret) { | |
764 | ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret); | |
765 | return ret; | |
766 | } | |
767 | ||
768 | qp_attr.qp_state = IB_QPS_INIT; | |
769 | qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE; | |
770 | qp_attr.port_num = priv->port; | |
771 | qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT; | |
772 | ||
773 | ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); | |
774 | if (ret) { | |
775 | ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret); | |
776 | return ret; | |
777 | } | |
778 | return 0; | |
779 | } | |
780 | ||
781 | static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn, | |
782 | struct ib_sa_path_rec *pathrec) | |
783 | { | |
784 | struct ipoib_dev_priv *priv = netdev_priv(p->dev); | |
785 | int ret; | |
786 | ||
787 | p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, | |
788 | GFP_KERNEL); | |
789 | if (!p->tx_ring) { | |
790 | ipoib_warn(priv, "failed to allocate tx ring\n"); | |
791 | ret = -ENOMEM; | |
792 | goto err_tx; | |
793 | } | |
794 | ||
795 | p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p, | |
796 | ipoib_sendq_size + 1); | |
797 | if (IS_ERR(p->cq)) { | |
798 | ret = PTR_ERR(p->cq); | |
799 | ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret); | |
800 | goto err_cq; | |
801 | } | |
802 | ||
803 | ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP); | |
804 | if (ret) { | |
805 | ipoib_warn(priv, "failed to request completion notification: %d\n", ret); | |
806 | goto err_req_notify; | |
807 | } | |
808 | ||
809 | p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq); | |
810 | if (IS_ERR(p->qp)) { | |
811 | ret = PTR_ERR(p->qp); | |
812 | ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret); | |
813 | goto err_qp; | |
814 | } | |
815 | ||
816 | p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p); | |
817 | if (IS_ERR(p->id)) { | |
818 | ret = PTR_ERR(p->id); | |
819 | ipoib_warn(priv, "failed to create tx cm id: %d\n", ret); | |
820 | goto err_id; | |
821 | } | |
822 | ||
823 | ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp); | |
824 | if (ret) { | |
825 | ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret); | |
826 | goto err_modify; | |
827 | } | |
828 | ||
829 | ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec); | |
830 | if (ret) { | |
831 | ipoib_warn(priv, "failed to send cm req: %d\n", ret); | |
832 | goto err_send_cm; | |
833 | } | |
834 | ||
835 | ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n", | |
836 | p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn); | |
837 | ||
838 | return 0; | |
839 | ||
840 | err_send_cm: | |
841 | err_modify: | |
842 | ib_destroy_cm_id(p->id); | |
843 | err_id: | |
844 | p->id = NULL; | |
845 | ib_destroy_qp(p->qp); | |
846 | err_req_notify: | |
847 | err_qp: | |
848 | p->qp = NULL; | |
849 | ib_destroy_cq(p->cq); | |
850 | err_cq: | |
851 | p->cq = NULL; | |
852 | err_tx: | |
853 | return ret; | |
854 | } | |
855 | ||
856 | static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p) | |
857 | { | |
858 | struct ipoib_dev_priv *priv = netdev_priv(p->dev); | |
859 | struct ipoib_tx_buf *tx_req; | |
860 | ||
861 | ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n", | |
862 | p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail); | |
863 | ||
864 | if (p->id) | |
865 | ib_destroy_cm_id(p->id); | |
866 | ||
867 | if (p->qp) | |
868 | ib_destroy_qp(p->qp); | |
869 | ||
870 | if (p->cq) | |
871 | ib_destroy_cq(p->cq); | |
872 | ||
873 | if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags)) | |
874 | netif_wake_queue(p->dev); | |
875 | ||
876 | if (p->tx_ring) { | |
877 | while ((int) p->tx_tail - (int) p->tx_head < 0) { | |
878 | tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)]; | |
879 | ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, | |
880 | DMA_TO_DEVICE); | |
881 | dev_kfree_skb_any(tx_req->skb); | |
882 | ++p->tx_tail; | |
883 | } | |
884 | ||
885 | kfree(p->tx_ring); | |
886 | } | |
887 | ||
888 | kfree(p); | |
889 | } | |
890 | ||
891 | static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id, | |
892 | struct ib_cm_event *event) | |
893 | { | |
894 | struct ipoib_cm_tx *tx = cm_id->context; | |
895 | struct ipoib_dev_priv *priv = netdev_priv(tx->dev); | |
896 | struct net_device *dev = priv->dev; | |
897 | struct ipoib_neigh *neigh; | |
898 | unsigned long flags; | |
899 | int ret; | |
900 | ||
901 | switch (event->event) { | |
902 | case IB_CM_DREQ_RECEIVED: | |
903 | ipoib_dbg(priv, "DREQ received.\n"); | |
904 | ib_send_cm_drep(cm_id, NULL, 0); | |
905 | break; | |
906 | case IB_CM_REP_RECEIVED: | |
907 | ipoib_dbg(priv, "REP received.\n"); | |
908 | ret = ipoib_cm_rep_handler(cm_id, event); | |
909 | if (ret) | |
910 | ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, | |
911 | NULL, 0, NULL, 0); | |
912 | break; | |
913 | case IB_CM_REQ_ERROR: | |
914 | case IB_CM_REJ_RECEIVED: | |
915 | case IB_CM_TIMEWAIT_EXIT: | |
916 | ipoib_dbg(priv, "CM error %d.\n", event->event); | |
917 | spin_lock_irqsave(&priv->tx_lock, flags); | |
918 | spin_lock(&priv->lock); | |
919 | neigh = tx->neigh; | |
920 | ||
921 | if (neigh) { | |
922 | neigh->cm = NULL; | |
923 | list_del(&neigh->list); | |
924 | if (neigh->ah) | |
925 | ipoib_put_ah(neigh->ah); | |
926 | ipoib_neigh_free(dev, neigh); | |
927 | ||
928 | tx->neigh = NULL; | |
929 | } | |
930 | ||
931 | if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { | |
932 | list_move(&tx->list, &priv->cm.reap_list); | |
933 | queue_work(ipoib_workqueue, &priv->cm.reap_task); | |
934 | } | |
935 | ||
936 | spin_unlock(&priv->lock); | |
937 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
938 | break; | |
939 | default: | |
940 | break; | |
941 | } | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path, | |
947 | struct ipoib_neigh *neigh) | |
948 | { | |
949 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
950 | struct ipoib_cm_tx *tx; | |
951 | ||
952 | tx = kzalloc(sizeof *tx, GFP_ATOMIC); | |
953 | if (!tx) | |
954 | return NULL; | |
955 | ||
956 | neigh->cm = tx; | |
957 | tx->neigh = neigh; | |
958 | tx->path = path; | |
959 | tx->dev = dev; | |
960 | list_add(&tx->list, &priv->cm.start_list); | |
961 | set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags); | |
962 | queue_work(ipoib_workqueue, &priv->cm.start_task); | |
963 | return tx; | |
964 | } | |
965 | ||
966 | void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx) | |
967 | { | |
968 | struct ipoib_dev_priv *priv = netdev_priv(tx->dev); | |
969 | if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) { | |
970 | list_move(&tx->list, &priv->cm.reap_list); | |
971 | queue_work(ipoib_workqueue, &priv->cm.reap_task); | |
972 | ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n", | |
973 | IPOIB_GID_ARG(tx->neigh->dgid)); | |
974 | tx->neigh = NULL; | |
975 | } | |
976 | } | |
977 | ||
978 | static void ipoib_cm_tx_start(struct work_struct *work) | |
979 | { | |
980 | struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, | |
981 | cm.start_task); | |
982 | struct net_device *dev = priv->dev; | |
983 | struct ipoib_neigh *neigh; | |
984 | struct ipoib_cm_tx *p; | |
985 | unsigned long flags; | |
986 | int ret; | |
987 | ||
988 | struct ib_sa_path_rec pathrec; | |
989 | u32 qpn; | |
990 | ||
991 | spin_lock_irqsave(&priv->tx_lock, flags); | |
992 | spin_lock(&priv->lock); | |
993 | while (!list_empty(&priv->cm.start_list)) { | |
994 | p = list_entry(priv->cm.start_list.next, typeof(*p), list); | |
995 | list_del_init(&p->list); | |
996 | neigh = p->neigh; | |
997 | qpn = IPOIB_QPN(neigh->neighbour->ha); | |
998 | memcpy(&pathrec, &p->path->pathrec, sizeof pathrec); | |
999 | spin_unlock(&priv->lock); | |
1000 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1001 | ret = ipoib_cm_tx_init(p, qpn, &pathrec); | |
1002 | spin_lock_irqsave(&priv->tx_lock, flags); | |
1003 | spin_lock(&priv->lock); | |
1004 | if (ret) { | |
1005 | neigh = p->neigh; | |
1006 | if (neigh) { | |
1007 | neigh->cm = NULL; | |
1008 | list_del(&neigh->list); | |
1009 | if (neigh->ah) | |
1010 | ipoib_put_ah(neigh->ah); | |
1011 | ipoib_neigh_free(dev, neigh); | |
1012 | } | |
1013 | list_del(&p->list); | |
1014 | kfree(p); | |
1015 | } | |
1016 | } | |
1017 | spin_unlock(&priv->lock); | |
1018 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1019 | } | |
1020 | ||
1021 | static void ipoib_cm_tx_reap(struct work_struct *work) | |
1022 | { | |
1023 | struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, | |
1024 | cm.reap_task); | |
1025 | struct ipoib_cm_tx *p; | |
1026 | unsigned long flags; | |
1027 | ||
1028 | spin_lock_irqsave(&priv->tx_lock, flags); | |
1029 | spin_lock(&priv->lock); | |
1030 | while (!list_empty(&priv->cm.reap_list)) { | |
1031 | p = list_entry(priv->cm.reap_list.next, typeof(*p), list); | |
1032 | list_del(&p->list); | |
1033 | spin_unlock(&priv->lock); | |
1034 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1035 | ipoib_cm_tx_destroy(p); | |
1036 | spin_lock_irqsave(&priv->tx_lock, flags); | |
1037 | spin_lock(&priv->lock); | |
1038 | } | |
1039 | spin_unlock(&priv->lock); | |
1040 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1041 | } | |
1042 | ||
1043 | static void ipoib_cm_skb_reap(struct work_struct *work) | |
1044 | { | |
1045 | struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, | |
1046 | cm.skb_task); | |
1047 | struct net_device *dev = priv->dev; | |
1048 | struct sk_buff *skb; | |
1049 | unsigned long flags; | |
1050 | ||
1051 | unsigned mtu = priv->mcast_mtu; | |
1052 | ||
1053 | spin_lock_irqsave(&priv->tx_lock, flags); | |
1054 | spin_lock(&priv->lock); | |
1055 | while ((skb = skb_dequeue(&priv->cm.skb_queue))) { | |
1056 | spin_unlock(&priv->lock); | |
1057 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1058 | if (skb->protocol == htons(ETH_P_IP)) | |
1059 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
1060 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
1061 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
1062 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); | |
1063 | #endif | |
1064 | dev_kfree_skb_any(skb); | |
1065 | spin_lock_irqsave(&priv->tx_lock, flags); | |
1066 | spin_lock(&priv->lock); | |
1067 | } | |
1068 | spin_unlock(&priv->lock); | |
1069 | spin_unlock_irqrestore(&priv->tx_lock, flags); | |
1070 | } | |
1071 | ||
1072 | void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb, | |
1073 | unsigned int mtu) | |
1074 | { | |
1075 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
1076 | int e = skb_queue_empty(&priv->cm.skb_queue); | |
1077 | ||
1078 | if (skb->dst) | |
1079 | skb->dst->ops->update_pmtu(skb->dst, mtu); | |
1080 | ||
1081 | skb_queue_tail(&priv->cm.skb_queue, skb); | |
1082 | if (e) | |
1083 | queue_work(ipoib_workqueue, &priv->cm.skb_task); | |
1084 | } | |
1085 | ||
1086 | static void ipoib_cm_stale_task(struct work_struct *work) | |
1087 | { | |
1088 | struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv, | |
1089 | cm.stale_task.work); | |
1090 | struct ipoib_cm_rx *p; | |
1091 | unsigned long flags; | |
1092 | ||
1093 | spin_lock_irqsave(&priv->lock, flags); | |
1094 | while (!list_empty(&priv->cm.passive_ids)) { | |
1095 | /* List if sorted by LRU, start from tail, | |
1096 | * stop when we see a recently used entry */ | |
1097 | p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list); | |
60a596da | 1098 | if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT)) |
839fcaba MT |
1099 | break; |
1100 | list_del_init(&p->list); | |
1101 | spin_unlock_irqrestore(&priv->lock, flags); | |
1102 | ib_destroy_cm_id(p->id); | |
1103 | ib_destroy_qp(p->qp); | |
1104 | kfree(p); | |
1105 | spin_lock_irqsave(&priv->lock, flags); | |
1106 | } | |
1107 | spin_unlock_irqrestore(&priv->lock, flags); | |
1108 | } | |
1109 | ||
1110 | ||
1111 | static ssize_t show_mode(struct device *d, struct device_attribute *attr, | |
1112 | char *buf) | |
1113 | { | |
1114 | struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d)); | |
1115 | ||
1116 | if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags)) | |
1117 | return sprintf(buf, "connected\n"); | |
1118 | else | |
1119 | return sprintf(buf, "datagram\n"); | |
1120 | } | |
1121 | ||
1122 | static ssize_t set_mode(struct device *d, struct device_attribute *attr, | |
1123 | const char *buf, size_t count) | |
1124 | { | |
1125 | struct net_device *dev = to_net_dev(d); | |
1126 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
1127 | ||
1128 | /* flush paths if we switch modes so that connections are restarted */ | |
1129 | if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) { | |
1130 | set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); | |
1131 | ipoib_warn(priv, "enabling connected mode " | |
1132 | "will cause multicast packet drops\n"); | |
1133 | ipoib_flush_paths(dev); | |
1134 | return count; | |
1135 | } | |
1136 | ||
1137 | if (!strcmp(buf, "datagram\n")) { | |
1138 | clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags); | |
1139 | dev->mtu = min(priv->mcast_mtu, dev->mtu); | |
1140 | ipoib_flush_paths(dev); | |
1141 | return count; | |
1142 | } | |
1143 | ||
1144 | return -EINVAL; | |
1145 | } | |
1146 | ||
551fd612 | 1147 | static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode); |
839fcaba MT |
1148 | |
1149 | int ipoib_cm_add_mode_attr(struct net_device *dev) | |
1150 | { | |
1151 | return device_create_file(&dev->dev, &dev_attr_mode); | |
1152 | } | |
1153 | ||
1154 | int ipoib_cm_dev_init(struct net_device *dev) | |
1155 | { | |
1156 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
1157 | struct ib_srq_init_attr srq_init_attr = { | |
1158 | .attr = { | |
1159 | .max_wr = ipoib_recvq_size, | |
1160 | .max_sge = IPOIB_CM_RX_SG | |
1161 | } | |
1162 | }; | |
1163 | int ret, i; | |
1164 | ||
1165 | INIT_LIST_HEAD(&priv->cm.passive_ids); | |
1166 | INIT_LIST_HEAD(&priv->cm.reap_list); | |
1167 | INIT_LIST_HEAD(&priv->cm.start_list); | |
1168 | INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start); | |
1169 | INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap); | |
1170 | INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap); | |
1171 | INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task); | |
1172 | ||
1173 | skb_queue_head_init(&priv->cm.skb_queue); | |
1174 | ||
1175 | priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr); | |
1176 | if (IS_ERR(priv->cm.srq)) { | |
1177 | ret = PTR_ERR(priv->cm.srq); | |
1178 | priv->cm.srq = NULL; | |
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, | |
1183 | GFP_KERNEL); | |
1184 | if (!priv->cm.srq_ring) { | |
1185 | printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n", | |
1186 | priv->ca->name, ipoib_recvq_size); | |
1187 | ipoib_cm_dev_cleanup(dev); | |
1188 | return -ENOMEM; | |
1189 | } | |
1190 | ||
1191 | for (i = 0; i < IPOIB_CM_RX_SG; ++i) | |
1192 | priv->cm.rx_sge[i].lkey = priv->mr->lkey; | |
1193 | ||
1194 | priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE; | |
1195 | for (i = 1; i < IPOIB_CM_RX_SG; ++i) | |
1196 | priv->cm.rx_sge[i].length = PAGE_SIZE; | |
1197 | priv->cm.rx_wr.next = NULL; | |
1198 | priv->cm.rx_wr.sg_list = priv->cm.rx_sge; | |
1199 | priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG; | |
1200 | ||
1201 | for (i = 0; i < ipoib_recvq_size; ++i) { | |
1812063b MT |
1202 | if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1, |
1203 | priv->cm.srq_ring[i].mapping)) { | |
839fcaba MT |
1204 | ipoib_warn(priv, "failed to allocate receive buffer %d\n", i); |
1205 | ipoib_cm_dev_cleanup(dev); | |
1206 | return -ENOMEM; | |
1207 | } | |
1208 | if (ipoib_cm_post_receive(dev, i)) { | |
1209 | ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i); | |
1210 | ipoib_cm_dev_cleanup(dev); | |
1211 | return -EIO; | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | priv->dev->dev_addr[0] = IPOIB_FLAGS_RC; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | void ipoib_cm_dev_cleanup(struct net_device *dev) | |
1220 | { | |
1221 | struct ipoib_dev_priv *priv = netdev_priv(dev); | |
1222 | int i, ret; | |
1223 | ||
1224 | if (!priv->cm.srq) | |
1225 | return; | |
1226 | ||
1227 | ipoib_dbg(priv, "Cleanup ipoib connected mode.\n"); | |
1228 | ||
1229 | ret = ib_destroy_srq(priv->cm.srq); | |
1230 | if (ret) | |
1231 | ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret); | |
1232 | ||
1233 | priv->cm.srq = NULL; | |
1234 | if (!priv->cm.srq_ring) | |
1235 | return; | |
1236 | for (i = 0; i < ipoib_recvq_size; ++i) | |
1237 | if (priv->cm.srq_ring[i].skb) { | |
1812063b MT |
1238 | ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1, |
1239 | priv->cm.srq_ring[i].mapping); | |
839fcaba MT |
1240 | dev_kfree_skb_any(priv->cm.srq_ring[i].skb); |
1241 | priv->cm.srq_ring[i].skb = NULL; | |
1242 | } | |
1243 | kfree(priv->cm.srq_ring); | |
1244 | priv->cm.srq_ring = NULL; | |
1245 | } |