2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <rdma/ib_cm.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
41 #include <linux/sched/signal.h>
42 #include <linux/sched/mm.h>
46 int ipoib_max_conn_qp
= 128;
48 module_param_named(max_nonsrq_conn_qp
, ipoib_max_conn_qp
, int, 0444);
49 MODULE_PARM_DESC(max_nonsrq_conn_qp
,
50 "Max number of connected-mode QPs per interface "
51 "(applied only if shared receive queue is not available)");
53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
54 static int data_debug_level
;
56 module_param_named(cm_data_debug_level
, data_debug_level
, int, 0644);
57 MODULE_PARM_DESC(cm_data_debug_level
,
58 "Enable data path debug tracing for connected mode if > 0");
61 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
63 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
64 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
65 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
66 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
68 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
70 static struct ib_qp_attr ipoib_cm_err_attr
= {
71 .qp_state
= IB_QPS_ERR
74 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
76 static struct ib_send_wr ipoib_cm_rx_drain_wr
= {
80 static int ipoib_cm_tx_handler(struct ib_cm_id
*cm_id
,
81 struct ib_cm_event
*event
);
83 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv
*priv
, int frags
,
84 u64 mapping
[IPOIB_CM_RX_SG
])
88 ib_dma_unmap_single(priv
->ca
, mapping
[0], IPOIB_CM_HEAD_SIZE
, DMA_FROM_DEVICE
);
90 for (i
= 0; i
< frags
; ++i
)
91 ib_dma_unmap_page(priv
->ca
, mapping
[i
+ 1], PAGE_SIZE
, DMA_FROM_DEVICE
);
94 static int ipoib_cm_post_receive_srq(struct net_device
*dev
, int id
)
96 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
97 struct ib_recv_wr
*bad_wr
;
100 priv
->cm
.rx_wr
.wr_id
= id
| IPOIB_OP_CM
| IPOIB_OP_RECV
;
102 for (i
= 0; i
< priv
->cm
.num_frags
; ++i
)
103 priv
->cm
.rx_sge
[i
].addr
= priv
->cm
.srq_ring
[id
].mapping
[i
];
105 ret
= ib_post_srq_recv(priv
->cm
.srq
, &priv
->cm
.rx_wr
, &bad_wr
);
107 ipoib_warn(priv
, "post srq failed for buf %d (%d)\n", id
, ret
);
108 ipoib_cm_dma_unmap_rx(priv
, priv
->cm
.num_frags
- 1,
109 priv
->cm
.srq_ring
[id
].mapping
);
110 dev_kfree_skb_any(priv
->cm
.srq_ring
[id
].skb
);
111 priv
->cm
.srq_ring
[id
].skb
= NULL
;
117 static int ipoib_cm_post_receive_nonsrq(struct net_device
*dev
,
118 struct ipoib_cm_rx
*rx
,
119 struct ib_recv_wr
*wr
,
120 struct ib_sge
*sge
, int id
)
122 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
123 struct ib_recv_wr
*bad_wr
;
126 wr
->wr_id
= id
| IPOIB_OP_CM
| IPOIB_OP_RECV
;
128 for (i
= 0; i
< IPOIB_CM_RX_SG
; ++i
)
129 sge
[i
].addr
= rx
->rx_ring
[id
].mapping
[i
];
131 ret
= ib_post_recv(rx
->qp
, wr
, &bad_wr
);
133 ipoib_warn(priv
, "post recv failed for buf %d (%d)\n", id
, ret
);
134 ipoib_cm_dma_unmap_rx(priv
, IPOIB_CM_RX_SG
- 1,
135 rx
->rx_ring
[id
].mapping
);
136 dev_kfree_skb_any(rx
->rx_ring
[id
].skb
);
137 rx
->rx_ring
[id
].skb
= NULL
;
143 static struct sk_buff
*ipoib_cm_alloc_rx_skb(struct net_device
*dev
,
144 struct ipoib_cm_rx_buf
*rx_ring
,
146 u64 mapping
[IPOIB_CM_RX_SG
],
149 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
153 skb
= dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE
+ IPOIB_PSEUDO_LEN
, 16));
158 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
159 * IP header to a multiple of 16.
161 skb_reserve(skb
, IPOIB_CM_RX_RESERVE
);
163 mapping
[0] = ib_dma_map_single(priv
->ca
, skb
->data
, IPOIB_CM_HEAD_SIZE
,
165 if (unlikely(ib_dma_mapping_error(priv
->ca
, mapping
[0]))) {
166 dev_kfree_skb_any(skb
);
170 for (i
= 0; i
< frags
; i
++) {
171 struct page
*page
= alloc_page(gfp
);
175 skb_fill_page_desc(skb
, i
, page
, 0, PAGE_SIZE
);
177 mapping
[i
+ 1] = ib_dma_map_page(priv
->ca
, page
,
178 0, PAGE_SIZE
, DMA_FROM_DEVICE
);
179 if (unlikely(ib_dma_mapping_error(priv
->ca
, mapping
[i
+ 1])))
183 rx_ring
[id
].skb
= skb
;
188 ib_dma_unmap_single(priv
->ca
, mapping
[0], IPOIB_CM_HEAD_SIZE
, DMA_FROM_DEVICE
);
191 ib_dma_unmap_page(priv
->ca
, mapping
[i
], PAGE_SIZE
, DMA_FROM_DEVICE
);
193 dev_kfree_skb_any(skb
);
197 static void ipoib_cm_free_rx_ring(struct net_device
*dev
,
198 struct ipoib_cm_rx_buf
*rx_ring
)
200 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
203 for (i
= 0; i
< ipoib_recvq_size
; ++i
)
204 if (rx_ring
[i
].skb
) {
205 ipoib_cm_dma_unmap_rx(priv
, IPOIB_CM_RX_SG
- 1,
207 dev_kfree_skb_any(rx_ring
[i
].skb
);
213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv
*priv
)
215 struct ib_send_wr
*bad_wr
;
216 struct ipoib_cm_rx
*p
;
218 /* We only reserved 1 extra slot in CQ for drain WRs, so
219 * make sure we have at most 1 outstanding WR. */
220 if (list_empty(&priv
->cm
.rx_flush_list
) ||
221 !list_empty(&priv
->cm
.rx_drain_list
))
225 * QPs on flush list are error state. This way, a "flush
226 * error" WC will be immediately generated for each WR we post.
228 p
= list_entry(priv
->cm
.rx_flush_list
.next
, typeof(*p
), list
);
229 ipoib_cm_rx_drain_wr
.wr_id
= IPOIB_CM_RX_DRAIN_WRID
;
230 if (ib_post_send(p
->qp
, &ipoib_cm_rx_drain_wr
, &bad_wr
))
231 ipoib_warn(priv
, "failed to post drain wr\n");
233 list_splice_init(&priv
->cm
.rx_flush_list
, &priv
->cm
.rx_drain_list
);
236 static void ipoib_cm_rx_event_handler(struct ib_event
*event
, void *ctx
)
238 struct ipoib_cm_rx
*p
= ctx
;
239 struct ipoib_dev_priv
*priv
= ipoib_priv(p
->dev
);
242 if (event
->event
!= IB_EVENT_QP_LAST_WQE_REACHED
)
245 spin_lock_irqsave(&priv
->lock
, flags
);
246 list_move(&p
->list
, &priv
->cm
.rx_flush_list
);
247 p
->state
= IPOIB_CM_RX_FLUSH
;
248 ipoib_cm_start_rx_drain(priv
);
249 spin_unlock_irqrestore(&priv
->lock
, flags
);
252 static struct ib_qp
*ipoib_cm_create_rx_qp(struct net_device
*dev
,
253 struct ipoib_cm_rx
*p
)
255 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
256 struct ib_qp_init_attr attr
= {
257 .event_handler
= ipoib_cm_rx_event_handler
,
258 .send_cq
= priv
->recv_cq
, /* For drain WR */
259 .recv_cq
= priv
->recv_cq
,
261 .cap
.max_send_wr
= 1, /* For drain WR */
262 .cap
.max_send_sge
= 1, /* FIXME: 0 Seems not to work */
263 .sq_sig_type
= IB_SIGNAL_ALL_WR
,
264 .qp_type
= IB_QPT_RC
,
268 if (!ipoib_cm_has_srq(dev
)) {
269 attr
.cap
.max_recv_wr
= ipoib_recvq_size
;
270 attr
.cap
.max_recv_sge
= IPOIB_CM_RX_SG
;
273 return ib_create_qp(priv
->pd
, &attr
);
276 static int ipoib_cm_modify_rx_qp(struct net_device
*dev
,
277 struct ib_cm_id
*cm_id
, struct ib_qp
*qp
,
280 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
281 struct ib_qp_attr qp_attr
;
282 int qp_attr_mask
, ret
;
284 qp_attr
.qp_state
= IB_QPS_INIT
;
285 ret
= ib_cm_init_qp_attr(cm_id
, &qp_attr
, &qp_attr_mask
);
287 ipoib_warn(priv
, "failed to init QP attr for INIT: %d\n", ret
);
290 ret
= ib_modify_qp(qp
, &qp_attr
, qp_attr_mask
);
292 ipoib_warn(priv
, "failed to modify QP to INIT: %d\n", ret
);
295 qp_attr
.qp_state
= IB_QPS_RTR
;
296 ret
= ib_cm_init_qp_attr(cm_id
, &qp_attr
, &qp_attr_mask
);
298 ipoib_warn(priv
, "failed to init QP attr for RTR: %d\n", ret
);
301 qp_attr
.rq_psn
= psn
;
302 ret
= ib_modify_qp(qp
, &qp_attr
, qp_attr_mask
);
304 ipoib_warn(priv
, "failed to modify QP to RTR: %d\n", ret
);
309 * Current Mellanox HCA firmware won't generate completions
310 * with error for drain WRs unless the QP has been moved to
311 * RTS first. This work-around leaves a window where a QP has
312 * moved to error asynchronously, but this will eventually get
313 * fixed in firmware, so let's not error out if modify QP
316 qp_attr
.qp_state
= IB_QPS_RTS
;
317 ret
= ib_cm_init_qp_attr(cm_id
, &qp_attr
, &qp_attr_mask
);
319 ipoib_warn(priv
, "failed to init QP attr for RTS: %d\n", ret
);
322 ret
= ib_modify_qp(qp
, &qp_attr
, qp_attr_mask
);
324 ipoib_warn(priv
, "failed to modify QP to RTS: %d\n", ret
);
331 static void ipoib_cm_init_rx_wr(struct net_device
*dev
,
332 struct ib_recv_wr
*wr
,
335 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
338 for (i
= 0; i
< priv
->cm
.num_frags
; ++i
)
339 sge
[i
].lkey
= priv
->pd
->local_dma_lkey
;
341 sge
[0].length
= IPOIB_CM_HEAD_SIZE
;
342 for (i
= 1; i
< priv
->cm
.num_frags
; ++i
)
343 sge
[i
].length
= PAGE_SIZE
;
347 wr
->num_sge
= priv
->cm
.num_frags
;
350 static int ipoib_cm_nonsrq_init_rx(struct net_device
*dev
, struct ib_cm_id
*cm_id
,
351 struct ipoib_cm_rx
*rx
)
353 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
355 struct ib_recv_wr wr
;
356 struct ib_sge sge
[IPOIB_CM_RX_SG
];
361 rx
->rx_ring
= vzalloc(ipoib_recvq_size
* sizeof *rx
->rx_ring
);
365 t
= kmalloc(sizeof *t
, GFP_KERNEL
);
371 ipoib_cm_init_rx_wr(dev
, &t
->wr
, t
->sge
);
373 spin_lock_irq(&priv
->lock
);
375 if (priv
->cm
.nonsrq_conn_qp
>= ipoib_max_conn_qp
) {
376 spin_unlock_irq(&priv
->lock
);
377 ib_send_cm_rej(cm_id
, IB_CM_REJ_NO_QP
, NULL
, 0, NULL
, 0);
381 ++priv
->cm
.nonsrq_conn_qp
;
383 spin_unlock_irq(&priv
->lock
);
385 for (i
= 0; i
< ipoib_recvq_size
; ++i
) {
386 if (!ipoib_cm_alloc_rx_skb(dev
, rx
->rx_ring
, i
, IPOIB_CM_RX_SG
- 1,
387 rx
->rx_ring
[i
].mapping
,
389 ipoib_warn(priv
, "failed to allocate receive buffer %d\n", i
);
393 ret
= ipoib_cm_post_receive_nonsrq(dev
, rx
, &t
->wr
, t
->sge
, i
);
395 ipoib_warn(priv
, "ipoib_cm_post_receive_nonsrq "
396 "failed for buf %d\n", i
);
402 rx
->recv_count
= ipoib_recvq_size
;
409 spin_lock_irq(&priv
->lock
);
410 --priv
->cm
.nonsrq_conn_qp
;
411 spin_unlock_irq(&priv
->lock
);
417 ipoib_cm_free_rx_ring(dev
, rx
->rx_ring
);
422 static int ipoib_cm_send_rep(struct net_device
*dev
, struct ib_cm_id
*cm_id
,
423 struct ib_qp
*qp
, struct ib_cm_req_event_param
*req
,
426 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
427 struct ipoib_cm_data data
= {};
428 struct ib_cm_rep_param rep
= {};
430 data
.qpn
= cpu_to_be32(priv
->qp
->qp_num
);
431 data
.mtu
= cpu_to_be32(IPOIB_CM_BUF_SIZE
);
433 rep
.private_data
= &data
;
434 rep
.private_data_len
= sizeof data
;
435 rep
.flow_control
= 0;
436 rep
.rnr_retry_count
= req
->rnr_retry_count
;
437 rep
.srq
= ipoib_cm_has_srq(dev
);
438 rep
.qp_num
= qp
->qp_num
;
439 rep
.starting_psn
= psn
;
440 return ib_send_cm_rep(cm_id
, &rep
);
443 static int ipoib_cm_req_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
445 struct net_device
*dev
= cm_id
->context
;
446 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
447 struct ipoib_cm_rx
*p
;
451 ipoib_dbg(priv
, "REQ arrived\n");
452 p
= kzalloc(sizeof *p
, GFP_KERNEL
);
458 p
->state
= IPOIB_CM_RX_LIVE
;
459 p
->jiffies
= jiffies
;
460 INIT_LIST_HEAD(&p
->list
);
462 p
->qp
= ipoib_cm_create_rx_qp(dev
, p
);
464 ret
= PTR_ERR(p
->qp
);
468 psn
= prandom_u32() & 0xffffff;
469 ret
= ipoib_cm_modify_rx_qp(dev
, cm_id
, p
->qp
, psn
);
473 if (!ipoib_cm_has_srq(dev
)) {
474 ret
= ipoib_cm_nonsrq_init_rx(dev
, cm_id
, p
);
479 spin_lock_irq(&priv
->lock
);
480 queue_delayed_work(priv
->wq
,
481 &priv
->cm
.stale_task
, IPOIB_CM_RX_DELAY
);
482 /* Add this entry to passive ids list head, but do not re-add it
483 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
484 p
->jiffies
= jiffies
;
485 if (p
->state
== IPOIB_CM_RX_LIVE
)
486 list_move(&p
->list
, &priv
->cm
.passive_ids
);
487 spin_unlock_irq(&priv
->lock
);
489 ret
= ipoib_cm_send_rep(dev
, cm_id
, p
->qp
, &event
->param
.req_rcvd
, psn
);
491 ipoib_warn(priv
, "failed to send REP: %d\n", ret
);
492 if (ib_modify_qp(p
->qp
, &ipoib_cm_err_attr
, IB_QP_STATE
))
493 ipoib_warn(priv
, "unable to move qp to error state\n");
498 ib_destroy_qp(p
->qp
);
504 static int ipoib_cm_rx_handler(struct ib_cm_id
*cm_id
,
505 struct ib_cm_event
*event
)
507 struct ipoib_cm_rx
*p
;
508 struct ipoib_dev_priv
*priv
;
510 switch (event
->event
) {
511 case IB_CM_REQ_RECEIVED
:
512 return ipoib_cm_req_handler(cm_id
, event
);
513 case IB_CM_DREQ_RECEIVED
:
515 ib_send_cm_drep(cm_id
, NULL
, 0);
517 case IB_CM_REJ_RECEIVED
:
519 priv
= ipoib_priv(p
->dev
);
520 if (ib_modify_qp(p
->qp
, &ipoib_cm_err_attr
, IB_QP_STATE
))
521 ipoib_warn(priv
, "unable to move qp to error state\n");
527 /* Adjust length of skb with fragments to match received data */
528 static void skb_put_frags(struct sk_buff
*skb
, unsigned int hdr_space
,
529 unsigned int length
, struct sk_buff
*toskb
)
534 /* put header into skb */
535 size
= min(length
, hdr_space
);
540 num_frags
= skb_shinfo(skb
)->nr_frags
;
541 for (i
= 0; i
< num_frags
; i
++) {
542 skb_frag_t
*frag
= &skb_shinfo(skb
)->frags
[i
];
545 /* don't need this page */
546 skb_fill_page_desc(toskb
, i
, skb_frag_page(frag
),
548 --skb_shinfo(skb
)->nr_frags
;
550 size
= min(length
, (unsigned) PAGE_SIZE
);
552 skb_frag_size_set(frag
, size
);
553 skb
->data_len
+= size
;
554 skb
->truesize
+= size
;
561 void ipoib_cm_handle_rx_wc(struct net_device
*dev
, struct ib_wc
*wc
)
563 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
564 struct ipoib_cm_rx_buf
*rx_ring
;
565 unsigned int wr_id
= wc
->wr_id
& ~(IPOIB_OP_CM
| IPOIB_OP_RECV
);
566 struct sk_buff
*skb
, *newskb
;
567 struct ipoib_cm_rx
*p
;
569 u64 mapping
[IPOIB_CM_RX_SG
];
572 struct sk_buff
*small_skb
;
574 ipoib_dbg_data(priv
, "cm recv completion: id %d, status: %d\n",
577 if (unlikely(wr_id
>= ipoib_recvq_size
)) {
578 if (wr_id
== (IPOIB_CM_RX_DRAIN_WRID
& ~(IPOIB_OP_CM
| IPOIB_OP_RECV
))) {
579 spin_lock_irqsave(&priv
->lock
, flags
);
580 list_splice_init(&priv
->cm
.rx_drain_list
, &priv
->cm
.rx_reap_list
);
581 ipoib_cm_start_rx_drain(priv
);
582 queue_work(priv
->wq
, &priv
->cm
.rx_reap_task
);
583 spin_unlock_irqrestore(&priv
->lock
, flags
);
585 ipoib_warn(priv
, "cm recv completion event with wrid %d (> %d)\n",
586 wr_id
, ipoib_recvq_size
);
590 p
= wc
->qp
->qp_context
;
592 has_srq
= ipoib_cm_has_srq(dev
);
593 rx_ring
= has_srq
? priv
->cm
.srq_ring
: p
->rx_ring
;
595 skb
= rx_ring
[wr_id
].skb
;
597 if (unlikely(wc
->status
!= IB_WC_SUCCESS
)) {
598 ipoib_dbg(priv
, "cm recv error "
599 "(status=%d, wrid=%d vend_err %x)\n",
600 wc
->status
, wr_id
, wc
->vendor_err
);
601 ++dev
->stats
.rx_dropped
;
605 if (!--p
->recv_count
) {
606 spin_lock_irqsave(&priv
->lock
, flags
);
607 list_move(&p
->list
, &priv
->cm
.rx_reap_list
);
608 spin_unlock_irqrestore(&priv
->lock
, flags
);
609 queue_work(priv
->wq
, &priv
->cm
.rx_reap_task
);
615 if (unlikely(!(wr_id
& IPOIB_CM_RX_UPDATE_MASK
))) {
616 if (p
&& time_after_eq(jiffies
, p
->jiffies
+ IPOIB_CM_RX_UPDATE_TIME
)) {
617 spin_lock_irqsave(&priv
->lock
, flags
);
618 p
->jiffies
= jiffies
;
619 /* Move this entry to list head, but do not re-add it
620 * if it has been moved out of list. */
621 if (p
->state
== IPOIB_CM_RX_LIVE
)
622 list_move(&p
->list
, &priv
->cm
.passive_ids
);
623 spin_unlock_irqrestore(&priv
->lock
, flags
);
627 if (wc
->byte_len
< IPOIB_CM_COPYBREAK
) {
628 int dlen
= wc
->byte_len
;
630 small_skb
= dev_alloc_skb(dlen
+ IPOIB_CM_RX_RESERVE
);
632 skb_reserve(small_skb
, IPOIB_CM_RX_RESERVE
);
633 ib_dma_sync_single_for_cpu(priv
->ca
, rx_ring
[wr_id
].mapping
[0],
634 dlen
, DMA_FROM_DEVICE
);
635 skb_copy_from_linear_data(skb
, small_skb
->data
, dlen
);
636 ib_dma_sync_single_for_device(priv
->ca
, rx_ring
[wr_id
].mapping
[0],
637 dlen
, DMA_FROM_DEVICE
);
638 skb_put(small_skb
, dlen
);
644 frags
= PAGE_ALIGN(wc
->byte_len
- min(wc
->byte_len
,
645 (unsigned)IPOIB_CM_HEAD_SIZE
)) / PAGE_SIZE
;
647 newskb
= ipoib_cm_alloc_rx_skb(dev
, rx_ring
, wr_id
, frags
,
648 mapping
, GFP_ATOMIC
);
649 if (unlikely(!newskb
)) {
651 * If we can't allocate a new RX buffer, dump
652 * this packet and reuse the old buffer.
654 ipoib_dbg(priv
, "failed to allocate receive buffer %d\n", wr_id
);
655 ++dev
->stats
.rx_dropped
;
659 ipoib_cm_dma_unmap_rx(priv
, frags
, rx_ring
[wr_id
].mapping
);
660 memcpy(rx_ring
[wr_id
].mapping
, mapping
, (frags
+ 1) * sizeof *mapping
);
662 ipoib_dbg_data(priv
, "received %d bytes, SLID 0x%04x\n",
663 wc
->byte_len
, wc
->slid
);
665 skb_put_frags(skb
, IPOIB_CM_HEAD_SIZE
, wc
->byte_len
, newskb
);
668 skb
->protocol
= ((struct ipoib_header
*) skb
->data
)->proto
;
669 skb_add_pseudo_hdr(skb
);
671 ++dev
->stats
.rx_packets
;
672 dev
->stats
.rx_bytes
+= skb
->len
;
675 /* XXX get correct PACKET_ type here */
676 skb
->pkt_type
= PACKET_HOST
;
677 netif_receive_skb(skb
);
681 if (unlikely(ipoib_cm_post_receive_srq(dev
, wr_id
)))
682 ipoib_warn(priv
, "ipoib_cm_post_receive_srq failed "
683 "for buf %d\n", wr_id
);
685 if (unlikely(ipoib_cm_post_receive_nonsrq(dev
, p
,
690 ipoib_warn(priv
, "ipoib_cm_post_receive_nonsrq failed "
691 "for buf %d\n", wr_id
);
696 static inline int post_send(struct ipoib_dev_priv
*priv
,
697 struct ipoib_cm_tx
*tx
,
699 struct ipoib_tx_buf
*tx_req
)
701 struct ib_send_wr
*bad_wr
;
703 ipoib_build_sge(priv
, tx_req
);
705 priv
->tx_wr
.wr
.wr_id
= wr_id
| IPOIB_OP_CM
;
707 return ib_post_send(tx
->qp
, &priv
->tx_wr
.wr
, &bad_wr
);
710 void ipoib_cm_send(struct net_device
*dev
, struct sk_buff
*skb
, struct ipoib_cm_tx
*tx
)
712 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
713 struct ipoib_tx_buf
*tx_req
;
715 unsigned usable_sge
= tx
->max_send_sge
- !!skb_headlen(skb
);
717 if (unlikely(skb
->len
> tx
->mtu
)) {
718 ipoib_warn(priv
, "packet len %d (> %d) too long to send, dropping\n",
720 ++dev
->stats
.tx_dropped
;
721 ++dev
->stats
.tx_errors
;
722 ipoib_cm_skb_too_long(dev
, skb
, tx
->mtu
- IPOIB_ENCAP_LEN
);
725 if (skb_shinfo(skb
)->nr_frags
> usable_sge
) {
726 if (skb_linearize(skb
) < 0) {
727 ipoib_warn(priv
, "skb could not be linearized\n");
728 ++dev
->stats
.tx_dropped
;
729 ++dev
->stats
.tx_errors
;
730 dev_kfree_skb_any(skb
);
733 /* Does skb_linearize return ok without reducing nr_frags? */
734 if (skb_shinfo(skb
)->nr_frags
> usable_sge
) {
735 ipoib_warn(priv
, "too many frags after skb linearize\n");
736 ++dev
->stats
.tx_dropped
;
737 ++dev
->stats
.tx_errors
;
738 dev_kfree_skb_any(skb
);
742 ipoib_dbg_data(priv
, "sending packet: head 0x%x length %d connection 0x%x\n",
743 tx
->tx_head
, skb
->len
, tx
->qp
->qp_num
);
746 * We put the skb into the tx_ring _before_ we call post_send()
747 * because it's entirely possible that the completion handler will
748 * run before we execute anything after the post_send(). That
749 * means we have to make sure everything is properly recorded and
750 * our state is consistent before we call post_send().
752 tx_req
= &tx
->tx_ring
[tx
->tx_head
& (ipoib_sendq_size
- 1)];
755 if (unlikely(ipoib_dma_map_tx(priv
->ca
, tx_req
))) {
756 ++dev
->stats
.tx_errors
;
757 dev_kfree_skb_any(skb
);
764 rc
= post_send(priv
, tx
, tx
->tx_head
& (ipoib_sendq_size
- 1), tx_req
);
766 ipoib_warn(priv
, "post_send failed, error %d\n", rc
);
767 ++dev
->stats
.tx_errors
;
768 ipoib_dma_unmap_tx(priv
, tx_req
);
769 dev_kfree_skb_any(skb
);
771 netif_trans_update(dev
);
774 if (++priv
->tx_outstanding
== ipoib_sendq_size
) {
775 ipoib_dbg(priv
, "TX ring 0x%x full, stopping kernel net queue\n",
777 netif_stop_queue(dev
);
778 rc
= ib_req_notify_cq(priv
->send_cq
,
779 IB_CQ_NEXT_COMP
| IB_CQ_REPORT_MISSED_EVENTS
);
781 ipoib_warn(priv
, "request notify on send CQ failed\n");
783 ipoib_send_comp_handler(priv
->send_cq
, dev
);
788 void ipoib_cm_handle_tx_wc(struct net_device
*dev
, struct ib_wc
*wc
)
790 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
791 struct ipoib_cm_tx
*tx
= wc
->qp
->qp_context
;
792 unsigned int wr_id
= wc
->wr_id
& ~IPOIB_OP_CM
;
793 struct ipoib_tx_buf
*tx_req
;
796 ipoib_dbg_data(priv
, "cm send completion: id %d, status: %d\n",
799 if (unlikely(wr_id
>= ipoib_sendq_size
)) {
800 ipoib_warn(priv
, "cm send completion event with wrid %d (> %d)\n",
801 wr_id
, ipoib_sendq_size
);
805 tx_req
= &tx
->tx_ring
[wr_id
];
807 ipoib_dma_unmap_tx(priv
, tx_req
);
809 /* FIXME: is this right? Shouldn't we only increment on success? */
810 ++dev
->stats
.tx_packets
;
811 dev
->stats
.tx_bytes
+= tx_req
->skb
->len
;
813 dev_kfree_skb_any(tx_req
->skb
);
818 if (unlikely(--priv
->tx_outstanding
== ipoib_sendq_size
>> 1) &&
819 netif_queue_stopped(dev
) &&
820 test_bit(IPOIB_FLAG_ADMIN_UP
, &priv
->flags
))
821 netif_wake_queue(dev
);
823 if (wc
->status
!= IB_WC_SUCCESS
&&
824 wc
->status
!= IB_WC_WR_FLUSH_ERR
) {
825 struct ipoib_neigh
*neigh
;
827 if (wc
->status
!= IB_WC_RNR_RETRY_EXC_ERR
)
828 ipoib_warn(priv
, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
829 wc
->status
, wr_id
, wc
->vendor_err
);
831 ipoib_dbg(priv
, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
832 wc
->status
, wr_id
, wc
->vendor_err
);
834 spin_lock_irqsave(&priv
->lock
, flags
);
839 ipoib_neigh_free(neigh
);
844 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED
, &tx
->flags
)) {
845 list_move(&tx
->list
, &priv
->cm
.reap_list
);
846 queue_work(priv
->wq
, &priv
->cm
.reap_task
);
849 clear_bit(IPOIB_FLAG_OPER_UP
, &tx
->flags
);
851 spin_unlock_irqrestore(&priv
->lock
, flags
);
854 netif_tx_unlock(dev
);
857 int ipoib_cm_dev_open(struct net_device
*dev
)
859 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
862 if (!IPOIB_CM_SUPPORTED(dev
->dev_addr
))
865 priv
->cm
.id
= ib_create_cm_id(priv
->ca
, ipoib_cm_rx_handler
, dev
);
866 if (IS_ERR(priv
->cm
.id
)) {
867 printk(KERN_WARNING
"%s: failed to create CM ID\n", priv
->ca
->name
);
868 ret
= PTR_ERR(priv
->cm
.id
);
872 ret
= ib_cm_listen(priv
->cm
.id
, cpu_to_be64(IPOIB_CM_IETF_ID
| priv
->qp
->qp_num
),
875 printk(KERN_WARNING
"%s: failed to listen on ID 0x%llx\n", priv
->ca
->name
,
876 IPOIB_CM_IETF_ID
| priv
->qp
->qp_num
);
883 ib_destroy_cm_id(priv
->cm
.id
);
889 static void ipoib_cm_free_rx_reap_list(struct net_device
*dev
)
891 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
892 struct ipoib_cm_rx
*rx
, *n
;
895 spin_lock_irq(&priv
->lock
);
896 list_splice_init(&priv
->cm
.rx_reap_list
, &list
);
897 spin_unlock_irq(&priv
->lock
);
899 list_for_each_entry_safe(rx
, n
, &list
, list
) {
900 ib_destroy_cm_id(rx
->id
);
901 ib_destroy_qp(rx
->qp
);
902 if (!ipoib_cm_has_srq(dev
)) {
903 ipoib_cm_free_rx_ring(priv
->dev
, rx
->rx_ring
);
904 spin_lock_irq(&priv
->lock
);
905 --priv
->cm
.nonsrq_conn_qp
;
906 spin_unlock_irq(&priv
->lock
);
912 void ipoib_cm_dev_stop(struct net_device
*dev
)
914 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
915 struct ipoib_cm_rx
*p
;
919 if (!IPOIB_CM_SUPPORTED(dev
->dev_addr
) || !priv
->cm
.id
)
922 ib_destroy_cm_id(priv
->cm
.id
);
925 spin_lock_irq(&priv
->lock
);
926 while (!list_empty(&priv
->cm
.passive_ids
)) {
927 p
= list_entry(priv
->cm
.passive_ids
.next
, typeof(*p
), list
);
928 list_move(&p
->list
, &priv
->cm
.rx_error_list
);
929 p
->state
= IPOIB_CM_RX_ERROR
;
930 spin_unlock_irq(&priv
->lock
);
931 ret
= ib_modify_qp(p
->qp
, &ipoib_cm_err_attr
, IB_QP_STATE
);
933 ipoib_warn(priv
, "unable to move qp to error state: %d\n", ret
);
934 spin_lock_irq(&priv
->lock
);
937 /* Wait for all RX to be drained */
940 while (!list_empty(&priv
->cm
.rx_error_list
) ||
941 !list_empty(&priv
->cm
.rx_flush_list
) ||
942 !list_empty(&priv
->cm
.rx_drain_list
)) {
943 if (time_after(jiffies
, begin
+ 5 * HZ
)) {
944 ipoib_warn(priv
, "RX drain timing out\n");
947 * assume the HW is wedged and just free up everything.
949 list_splice_init(&priv
->cm
.rx_flush_list
,
950 &priv
->cm
.rx_reap_list
);
951 list_splice_init(&priv
->cm
.rx_error_list
,
952 &priv
->cm
.rx_reap_list
);
953 list_splice_init(&priv
->cm
.rx_drain_list
,
954 &priv
->cm
.rx_reap_list
);
957 spin_unlock_irq(&priv
->lock
);
958 usleep_range(1000, 2000);
960 spin_lock_irq(&priv
->lock
);
963 spin_unlock_irq(&priv
->lock
);
965 ipoib_cm_free_rx_reap_list(dev
);
967 cancel_delayed_work(&priv
->cm
.stale_task
);
970 static int ipoib_cm_rep_handler(struct ib_cm_id
*cm_id
, struct ib_cm_event
*event
)
972 struct ipoib_cm_tx
*p
= cm_id
->context
;
973 struct ipoib_dev_priv
*priv
= ipoib_priv(p
->dev
);
974 struct ipoib_cm_data
*data
= event
->private_data
;
975 struct sk_buff_head skqueue
;
976 struct ib_qp_attr qp_attr
;
977 int qp_attr_mask
, ret
;
980 p
->mtu
= be32_to_cpu(data
->mtu
);
982 if (p
->mtu
<= IPOIB_ENCAP_LEN
) {
983 ipoib_warn(priv
, "Rejecting connection: mtu %d <= %d\n",
984 p
->mtu
, IPOIB_ENCAP_LEN
);
988 qp_attr
.qp_state
= IB_QPS_RTR
;
989 ret
= ib_cm_init_qp_attr(cm_id
, &qp_attr
, &qp_attr_mask
);
991 ipoib_warn(priv
, "failed to init QP attr for RTR: %d\n", ret
);
995 qp_attr
.rq_psn
= 0 /* FIXME */;
996 ret
= ib_modify_qp(p
->qp
, &qp_attr
, qp_attr_mask
);
998 ipoib_warn(priv
, "failed to modify QP to RTR: %d\n", ret
);
1002 qp_attr
.qp_state
= IB_QPS_RTS
;
1003 ret
= ib_cm_init_qp_attr(cm_id
, &qp_attr
, &qp_attr_mask
);
1005 ipoib_warn(priv
, "failed to init QP attr for RTS: %d\n", ret
);
1008 ret
= ib_modify_qp(p
->qp
, &qp_attr
, qp_attr_mask
);
1010 ipoib_warn(priv
, "failed to modify QP to RTS: %d\n", ret
);
1014 skb_queue_head_init(&skqueue
);
1016 spin_lock_irq(&priv
->lock
);
1017 set_bit(IPOIB_FLAG_OPER_UP
, &p
->flags
);
1019 while ((skb
= __skb_dequeue(&p
->neigh
->queue
)))
1020 __skb_queue_tail(&skqueue
, skb
);
1021 spin_unlock_irq(&priv
->lock
);
1023 while ((skb
= __skb_dequeue(&skqueue
))) {
1025 ret
= dev_queue_xmit(skb
);
1027 ipoib_warn(priv
, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1031 ret
= ib_send_cm_rtu(cm_id
, NULL
, 0);
1033 ipoib_warn(priv
, "failed to send RTU: %d\n", ret
);
1039 static struct ib_qp
*ipoib_cm_create_tx_qp(struct net_device
*dev
, struct ipoib_cm_tx
*tx
)
1041 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1042 struct ib_qp_init_attr attr
= {
1043 .send_cq
= priv
->recv_cq
,
1044 .recv_cq
= priv
->recv_cq
,
1045 .srq
= priv
->cm
.srq
,
1046 .cap
.max_send_wr
= ipoib_sendq_size
,
1047 .cap
.max_send_sge
= 1,
1048 .sq_sig_type
= IB_SIGNAL_ALL_WR
,
1049 .qp_type
= IB_QPT_RC
,
1053 struct ib_qp
*tx_qp
;
1055 if (dev
->features
& NETIF_F_SG
)
1056 attr
.cap
.max_send_sge
=
1057 min_t(u32
, priv
->ca
->attrs
.max_sge
, MAX_SKB_FRAGS
+ 1);
1059 tx_qp
= ib_create_qp(priv
->pd
, &attr
);
1060 tx
->max_send_sge
= attr
.cap
.max_send_sge
;
1064 static int ipoib_cm_send_req(struct net_device
*dev
,
1065 struct ib_cm_id
*id
, struct ib_qp
*qp
,
1067 struct sa_path_rec
*pathrec
)
1069 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1070 struct ipoib_cm_data data
= {};
1071 struct ib_cm_req_param req
= {};
1073 data
.qpn
= cpu_to_be32(priv
->qp
->qp_num
);
1074 data
.mtu
= cpu_to_be32(IPOIB_CM_BUF_SIZE
);
1076 req
.primary_path
= pathrec
;
1077 req
.alternate_path
= NULL
;
1078 req
.service_id
= cpu_to_be64(IPOIB_CM_IETF_ID
| qpn
);
1079 req
.qp_num
= qp
->qp_num
;
1080 req
.qp_type
= qp
->qp_type
;
1081 req
.private_data
= &data
;
1082 req
.private_data_len
= sizeof data
;
1083 req
.flow_control
= 0;
1085 req
.starting_psn
= 0; /* FIXME */
1088 * Pick some arbitrary defaults here; we could make these
1089 * module parameters if anyone cared about setting them.
1091 req
.responder_resources
= 4;
1092 req
.remote_cm_response_timeout
= 20;
1093 req
.local_cm_response_timeout
= 20;
1094 req
.retry_count
= 0; /* RFC draft warns against retries */
1095 req
.rnr_retry_count
= 0; /* RFC draft warns against retries */
1096 req
.max_cm_retries
= 15;
1097 req
.srq
= ipoib_cm_has_srq(dev
);
1098 return ib_send_cm_req(id
, &req
);
1101 static int ipoib_cm_modify_tx_init(struct net_device
*dev
,
1102 struct ib_cm_id
*cm_id
, struct ib_qp
*qp
)
1104 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1105 struct ib_qp_attr qp_attr
;
1106 int qp_attr_mask
, ret
;
1107 ret
= ib_find_pkey(priv
->ca
, priv
->port
, priv
->pkey
, &qp_attr
.pkey_index
);
1109 ipoib_warn(priv
, "pkey 0x%x not found: %d\n", priv
->pkey
, ret
);
1113 qp_attr
.qp_state
= IB_QPS_INIT
;
1114 qp_attr
.qp_access_flags
= IB_ACCESS_LOCAL_WRITE
;
1115 qp_attr
.port_num
= priv
->port
;
1116 qp_attr_mask
= IB_QP_STATE
| IB_QP_ACCESS_FLAGS
| IB_QP_PKEY_INDEX
| IB_QP_PORT
;
1118 ret
= ib_modify_qp(qp
, &qp_attr
, qp_attr_mask
);
1120 ipoib_warn(priv
, "failed to modify tx QP to INIT: %d\n", ret
);
1126 static int ipoib_cm_tx_init(struct ipoib_cm_tx
*p
, u32 qpn
,
1127 struct sa_path_rec
*pathrec
)
1129 struct ipoib_dev_priv
*priv
= ipoib_priv(p
->dev
);
1130 unsigned int noio_flag
;
1133 noio_flag
= memalloc_noio_save();
1134 p
->tx_ring
= vzalloc(ipoib_sendq_size
* sizeof(*p
->tx_ring
));
1139 memset(p
->tx_ring
, 0, ipoib_sendq_size
* sizeof *p
->tx_ring
);
1141 p
->qp
= ipoib_cm_create_tx_qp(p
->dev
, p
);
1142 memalloc_noio_restore(noio_flag
);
1143 if (IS_ERR(p
->qp
)) {
1144 ret
= PTR_ERR(p
->qp
);
1145 ipoib_warn(priv
, "failed to create tx qp: %d\n", ret
);
1149 p
->id
= ib_create_cm_id(priv
->ca
, ipoib_cm_tx_handler
, p
);
1150 if (IS_ERR(p
->id
)) {
1151 ret
= PTR_ERR(p
->id
);
1152 ipoib_warn(priv
, "failed to create tx cm id: %d\n", ret
);
1156 ret
= ipoib_cm_modify_tx_init(p
->dev
, p
->id
, p
->qp
);
1158 ipoib_warn(priv
, "failed to modify tx qp to rtr: %d\n", ret
);
1159 goto err_modify_send
;
1162 ret
= ipoib_cm_send_req(p
->dev
, p
->id
, p
->qp
, qpn
, pathrec
);
1164 ipoib_warn(priv
, "failed to send cm req: %d\n", ret
);
1165 goto err_modify_send
;
1168 ipoib_dbg(priv
, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1169 p
->qp
->qp_num
, pathrec
->dgid
.raw
, qpn
);
1174 ib_destroy_cm_id(p
->id
);
1177 ib_destroy_qp(p
->qp
);
1185 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx
*p
)
1187 struct ipoib_dev_priv
*priv
= ipoib_priv(p
->dev
);
1188 struct ipoib_tx_buf
*tx_req
;
1189 unsigned long begin
;
1191 ipoib_dbg(priv
, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1192 p
->qp
? p
->qp
->qp_num
: 0, p
->tx_head
, p
->tx_tail
);
1195 ib_destroy_cm_id(p
->id
);
1198 /* Wait for all sends to complete */
1200 while ((int) p
->tx_tail
- (int) p
->tx_head
< 0) {
1201 if (time_after(jiffies
, begin
+ 5 * HZ
)) {
1202 ipoib_warn(priv
, "timing out; %d sends not completed\n",
1203 p
->tx_head
- p
->tx_tail
);
1207 usleep_range(1000, 2000);
1213 while ((int) p
->tx_tail
- (int) p
->tx_head
< 0) {
1214 tx_req
= &p
->tx_ring
[p
->tx_tail
& (ipoib_sendq_size
- 1)];
1215 ipoib_dma_unmap_tx(priv
, tx_req
);
1216 dev_kfree_skb_any(tx_req
->skb
);
1218 netif_tx_lock_bh(p
->dev
);
1219 if (unlikely(--priv
->tx_outstanding
== ipoib_sendq_size
>> 1) &&
1220 netif_queue_stopped(p
->dev
) &&
1221 test_bit(IPOIB_FLAG_ADMIN_UP
, &priv
->flags
))
1222 netif_wake_queue(p
->dev
);
1223 netif_tx_unlock_bh(p
->dev
);
1227 ib_destroy_qp(p
->qp
);
1233 static int ipoib_cm_tx_handler(struct ib_cm_id
*cm_id
,
1234 struct ib_cm_event
*event
)
1236 struct ipoib_cm_tx
*tx
= cm_id
->context
;
1237 struct ipoib_dev_priv
*priv
= ipoib_priv(tx
->dev
);
1238 struct net_device
*dev
= priv
->dev
;
1239 struct ipoib_neigh
*neigh
;
1240 unsigned long flags
;
1243 switch (event
->event
) {
1244 case IB_CM_DREQ_RECEIVED
:
1245 ipoib_dbg(priv
, "DREQ received.\n");
1246 ib_send_cm_drep(cm_id
, NULL
, 0);
1248 case IB_CM_REP_RECEIVED
:
1249 ipoib_dbg(priv
, "REP received.\n");
1250 ret
= ipoib_cm_rep_handler(cm_id
, event
);
1252 ib_send_cm_rej(cm_id
, IB_CM_REJ_CONSUMER_DEFINED
,
1255 case IB_CM_REQ_ERROR
:
1256 case IB_CM_REJ_RECEIVED
:
1257 case IB_CM_TIMEWAIT_EXIT
:
1258 ipoib_dbg(priv
, "CM error %d.\n", event
->event
);
1259 netif_tx_lock_bh(dev
);
1260 spin_lock_irqsave(&priv
->lock
, flags
);
1265 ipoib_neigh_free(neigh
);
1270 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED
, &tx
->flags
)) {
1271 list_move(&tx
->list
, &priv
->cm
.reap_list
);
1272 queue_work(priv
->wq
, &priv
->cm
.reap_task
);
1275 spin_unlock_irqrestore(&priv
->lock
, flags
);
1276 netif_tx_unlock_bh(dev
);
1285 struct ipoib_cm_tx
*ipoib_cm_create_tx(struct net_device
*dev
, struct ipoib_path
*path
,
1286 struct ipoib_neigh
*neigh
)
1288 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1289 struct ipoib_cm_tx
*tx
;
1291 tx
= kzalloc(sizeof *tx
, GFP_ATOMIC
);
1299 list_add(&tx
->list
, &priv
->cm
.start_list
);
1300 set_bit(IPOIB_FLAG_INITIALIZED
, &tx
->flags
);
1301 queue_work(priv
->wq
, &priv
->cm
.start_task
);
1305 void ipoib_cm_destroy_tx(struct ipoib_cm_tx
*tx
)
1307 struct ipoib_dev_priv
*priv
= ipoib_priv(tx
->dev
);
1308 unsigned long flags
;
1309 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED
, &tx
->flags
)) {
1310 spin_lock_irqsave(&priv
->lock
, flags
);
1311 list_move(&tx
->list
, &priv
->cm
.reap_list
);
1312 queue_work(priv
->wq
, &priv
->cm
.reap_task
);
1313 ipoib_dbg(priv
, "Reap connection for gid %pI6\n",
1314 tx
->neigh
->daddr
+ 4);
1316 spin_unlock_irqrestore(&priv
->lock
, flags
);
1320 #define QPN_AND_OPTIONS_OFFSET 4
1322 static void ipoib_cm_tx_start(struct work_struct
*work
)
1324 struct ipoib_dev_priv
*priv
= container_of(work
, struct ipoib_dev_priv
,
1326 struct net_device
*dev
= priv
->dev
;
1327 struct ipoib_neigh
*neigh
;
1328 struct ipoib_cm_tx
*p
;
1329 unsigned long flags
;
1330 struct ipoib_path
*path
;
1333 struct sa_path_rec pathrec
;
1336 netif_tx_lock_bh(dev
);
1337 spin_lock_irqsave(&priv
->lock
, flags
);
1339 while (!list_empty(&priv
->cm
.start_list
)) {
1340 p
= list_entry(priv
->cm
.start_list
.next
, typeof(*p
), list
);
1341 list_del_init(&p
->list
);
1344 qpn
= IPOIB_QPN(neigh
->daddr
);
1346 * As long as the search is with these 2 locks,
1347 * path existence indicates its validity.
1349 path
= __path_find(dev
, neigh
->daddr
+ QPN_AND_OPTIONS_OFFSET
);
1351 pr_info("%s ignore not valid path %pI6\n",
1353 neigh
->daddr
+ QPN_AND_OPTIONS_OFFSET
);
1356 memcpy(&pathrec
, &p
->path
->pathrec
, sizeof pathrec
);
1358 spin_unlock_irqrestore(&priv
->lock
, flags
);
1359 netif_tx_unlock_bh(dev
);
1361 ret
= ipoib_cm_tx_init(p
, qpn
, &pathrec
);
1363 netif_tx_lock_bh(dev
);
1364 spin_lock_irqsave(&priv
->lock
, flags
);
1371 ipoib_neigh_free(neigh
);
1378 spin_unlock_irqrestore(&priv
->lock
, flags
);
1379 netif_tx_unlock_bh(dev
);
1382 static void ipoib_cm_tx_reap(struct work_struct
*work
)
1384 struct ipoib_dev_priv
*priv
= container_of(work
, struct ipoib_dev_priv
,
1386 struct net_device
*dev
= priv
->dev
;
1387 struct ipoib_cm_tx
*p
;
1388 unsigned long flags
;
1390 netif_tx_lock_bh(dev
);
1391 spin_lock_irqsave(&priv
->lock
, flags
);
1393 while (!list_empty(&priv
->cm
.reap_list
)) {
1394 p
= list_entry(priv
->cm
.reap_list
.next
, typeof(*p
), list
);
1395 list_del_init(&p
->list
);
1396 spin_unlock_irqrestore(&priv
->lock
, flags
);
1397 netif_tx_unlock_bh(dev
);
1398 ipoib_cm_tx_destroy(p
);
1399 netif_tx_lock_bh(dev
);
1400 spin_lock_irqsave(&priv
->lock
, flags
);
1403 spin_unlock_irqrestore(&priv
->lock
, flags
);
1404 netif_tx_unlock_bh(dev
);
1407 static void ipoib_cm_skb_reap(struct work_struct
*work
)
1409 struct ipoib_dev_priv
*priv
= container_of(work
, struct ipoib_dev_priv
,
1411 struct net_device
*dev
= priv
->dev
;
1412 struct sk_buff
*skb
;
1413 unsigned long flags
;
1414 unsigned mtu
= priv
->mcast_mtu
;
1416 netif_tx_lock_bh(dev
);
1417 spin_lock_irqsave(&priv
->lock
, flags
);
1419 while ((skb
= skb_dequeue(&priv
->cm
.skb_queue
))) {
1420 spin_unlock_irqrestore(&priv
->lock
, flags
);
1421 netif_tx_unlock_bh(dev
);
1423 if (skb
->protocol
== htons(ETH_P_IP
))
1424 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_FRAG_NEEDED
, htonl(mtu
));
1425 #if IS_ENABLED(CONFIG_IPV6)
1426 else if (skb
->protocol
== htons(ETH_P_IPV6
))
1427 icmpv6_send(skb
, ICMPV6_PKT_TOOBIG
, 0, mtu
);
1429 dev_kfree_skb_any(skb
);
1431 netif_tx_lock_bh(dev
);
1432 spin_lock_irqsave(&priv
->lock
, flags
);
1435 spin_unlock_irqrestore(&priv
->lock
, flags
);
1436 netif_tx_unlock_bh(dev
);
1439 void ipoib_cm_skb_too_long(struct net_device
*dev
, struct sk_buff
*skb
,
1442 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1443 int e
= skb_queue_empty(&priv
->cm
.skb_queue
);
1446 skb_dst(skb
)->ops
->update_pmtu(skb_dst(skb
), NULL
, skb
, mtu
);
1448 skb_queue_tail(&priv
->cm
.skb_queue
, skb
);
1450 queue_work(priv
->wq
, &priv
->cm
.skb_task
);
1453 static void ipoib_cm_rx_reap(struct work_struct
*work
)
1455 ipoib_cm_free_rx_reap_list(container_of(work
, struct ipoib_dev_priv
,
1456 cm
.rx_reap_task
)->dev
);
1459 static void ipoib_cm_stale_task(struct work_struct
*work
)
1461 struct ipoib_dev_priv
*priv
= container_of(work
, struct ipoib_dev_priv
,
1462 cm
.stale_task
.work
);
1463 struct ipoib_cm_rx
*p
;
1466 spin_lock_irq(&priv
->lock
);
1467 while (!list_empty(&priv
->cm
.passive_ids
)) {
1468 /* List is sorted by LRU, start from tail,
1469 * stop when we see a recently used entry */
1470 p
= list_entry(priv
->cm
.passive_ids
.prev
, typeof(*p
), list
);
1471 if (time_before_eq(jiffies
, p
->jiffies
+ IPOIB_CM_RX_TIMEOUT
))
1473 list_move(&p
->list
, &priv
->cm
.rx_error_list
);
1474 p
->state
= IPOIB_CM_RX_ERROR
;
1475 spin_unlock_irq(&priv
->lock
);
1476 ret
= ib_modify_qp(p
->qp
, &ipoib_cm_err_attr
, IB_QP_STATE
);
1478 ipoib_warn(priv
, "unable to move qp to error state: %d\n", ret
);
1479 spin_lock_irq(&priv
->lock
);
1482 if (!list_empty(&priv
->cm
.passive_ids
))
1483 queue_delayed_work(priv
->wq
,
1484 &priv
->cm
.stale_task
, IPOIB_CM_RX_DELAY
);
1485 spin_unlock_irq(&priv
->lock
);
1488 static ssize_t
show_mode(struct device
*d
, struct device_attribute
*attr
,
1491 struct net_device
*dev
= to_net_dev(d
);
1492 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1494 if (test_bit(IPOIB_FLAG_ADMIN_CM
, &priv
->flags
))
1495 return sprintf(buf
, "connected\n");
1497 return sprintf(buf
, "datagram\n");
1500 static ssize_t
set_mode(struct device
*d
, struct device_attribute
*attr
,
1501 const char *buf
, size_t count
)
1503 struct net_device
*dev
= to_net_dev(d
);
1505 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1507 if (test_bit(IPOIB_FLAG_GOING_DOWN
, &priv
->flags
))
1510 if (!rtnl_trylock())
1511 return restart_syscall();
1513 ret
= ipoib_set_mode(dev
, buf
);
1515 /* The assumption is that the function ipoib_set_mode returned
1516 * with the rtnl held by it, if not the value -EBUSY returned,
1517 * then no need to rtnl_unlock
1522 return (!ret
|| ret
== -EBUSY
) ? count
: ret
;
1525 static DEVICE_ATTR(mode
, S_IWUSR
| S_IRUGO
, show_mode
, set_mode
);
1527 int ipoib_cm_add_mode_attr(struct net_device
*dev
)
1529 return device_create_file(&dev
->dev
, &dev_attr_mode
);
1532 static void ipoib_cm_create_srq(struct net_device
*dev
, int max_sge
)
1534 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1535 struct ib_srq_init_attr srq_init_attr
= {
1536 .srq_type
= IB_SRQT_BASIC
,
1538 .max_wr
= ipoib_recvq_size
,
1543 priv
->cm
.srq
= ib_create_srq(priv
->pd
, &srq_init_attr
);
1544 if (IS_ERR(priv
->cm
.srq
)) {
1545 if (PTR_ERR(priv
->cm
.srq
) != -ENOSYS
)
1546 printk(KERN_WARNING
"%s: failed to allocate SRQ, error %ld\n",
1547 priv
->ca
->name
, PTR_ERR(priv
->cm
.srq
));
1548 priv
->cm
.srq
= NULL
;
1552 priv
->cm
.srq_ring
= vzalloc(ipoib_recvq_size
* sizeof *priv
->cm
.srq_ring
);
1553 if (!priv
->cm
.srq_ring
) {
1554 ib_destroy_srq(priv
->cm
.srq
);
1555 priv
->cm
.srq
= NULL
;
1561 int ipoib_cm_dev_init(struct net_device
*dev
)
1563 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1566 INIT_LIST_HEAD(&priv
->cm
.passive_ids
);
1567 INIT_LIST_HEAD(&priv
->cm
.reap_list
);
1568 INIT_LIST_HEAD(&priv
->cm
.start_list
);
1569 INIT_LIST_HEAD(&priv
->cm
.rx_error_list
);
1570 INIT_LIST_HEAD(&priv
->cm
.rx_flush_list
);
1571 INIT_LIST_HEAD(&priv
->cm
.rx_drain_list
);
1572 INIT_LIST_HEAD(&priv
->cm
.rx_reap_list
);
1573 INIT_WORK(&priv
->cm
.start_task
, ipoib_cm_tx_start
);
1574 INIT_WORK(&priv
->cm
.reap_task
, ipoib_cm_tx_reap
);
1575 INIT_WORK(&priv
->cm
.skb_task
, ipoib_cm_skb_reap
);
1576 INIT_WORK(&priv
->cm
.rx_reap_task
, ipoib_cm_rx_reap
);
1577 INIT_DELAYED_WORK(&priv
->cm
.stale_task
, ipoib_cm_stale_task
);
1579 skb_queue_head_init(&priv
->cm
.skb_queue
);
1581 ipoib_dbg(priv
, "max_srq_sge=%d\n", priv
->ca
->attrs
.max_srq_sge
);
1583 max_srq_sge
= min_t(int, IPOIB_CM_RX_SG
, priv
->ca
->attrs
.max_srq_sge
);
1584 ipoib_cm_create_srq(dev
, max_srq_sge
);
1585 if (ipoib_cm_has_srq(dev
)) {
1586 priv
->cm
.max_cm_mtu
= max_srq_sge
* PAGE_SIZE
- 0x10;
1587 priv
->cm
.num_frags
= max_srq_sge
;
1588 ipoib_dbg(priv
, "max_cm_mtu = 0x%x, num_frags=%d\n",
1589 priv
->cm
.max_cm_mtu
, priv
->cm
.num_frags
);
1591 priv
->cm
.max_cm_mtu
= IPOIB_CM_MTU
;
1592 priv
->cm
.num_frags
= IPOIB_CM_RX_SG
;
1595 ipoib_cm_init_rx_wr(dev
, &priv
->cm
.rx_wr
, priv
->cm
.rx_sge
);
1597 if (ipoib_cm_has_srq(dev
)) {
1598 for (i
= 0; i
< ipoib_recvq_size
; ++i
) {
1599 if (!ipoib_cm_alloc_rx_skb(dev
, priv
->cm
.srq_ring
, i
,
1600 priv
->cm
.num_frags
- 1,
1601 priv
->cm
.srq_ring
[i
].mapping
,
1603 ipoib_warn(priv
, "failed to allocate "
1604 "receive buffer %d\n", i
);
1605 ipoib_cm_dev_cleanup(dev
);
1609 if (ipoib_cm_post_receive_srq(dev
, i
)) {
1610 ipoib_warn(priv
, "ipoib_cm_post_receive_srq "
1611 "failed for buf %d\n", i
);
1612 ipoib_cm_dev_cleanup(dev
);
1618 priv
->dev
->dev_addr
[0] = IPOIB_FLAGS_RC
;
1622 void ipoib_cm_dev_cleanup(struct net_device
*dev
)
1624 struct ipoib_dev_priv
*priv
= ipoib_priv(dev
);
1630 ipoib_dbg(priv
, "Cleanup ipoib connected mode.\n");
1632 ret
= ib_destroy_srq(priv
->cm
.srq
);
1634 ipoib_warn(priv
, "ib_destroy_srq failed: %d\n", ret
);
1636 priv
->cm
.srq
= NULL
;
1637 if (!priv
->cm
.srq_ring
)
1640 ipoib_cm_free_rx_ring(dev
, priv
->cm
.srq_ring
);
1641 priv
->cm
.srq_ring
= NULL
;