2 * Copyright (c) 2016, 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
35 struct mlx5_ib_gsi_wr {
42 struct mlx5_ib_gsi_qp {
47 enum ib_sig_type sq_sig_type;
48 /* Serialize qp state modifications */
51 struct mlx5_ib_gsi_wr *outstanding_wrs;
52 u32 outstanding_pi, outstanding_ci;
54 /* Protects access to the tx_qps. Post send operations synchronize
55 * with tx_qp creation in setup_qp(). Also protects the
56 * outstanding_wrs array and indices.
59 struct ib_qp **tx_qps;
62 static struct mlx5_ib_gsi_qp *gsi_qp(struct ib_qp *qp)
64 return container_of(qp, struct mlx5_ib_gsi_qp, ibqp);
67 static bool mlx5_ib_deth_sqpn_cap(struct mlx5_ib_dev *dev)
69 return MLX5_CAP_GEN(dev->mdev, set_deth_sqpn);
72 /* Call with gsi->lock locked */
73 static void generate_completions(struct mlx5_ib_gsi_qp *gsi)
75 struct ib_cq *gsi_cq = gsi->ibqp.send_cq;
76 struct mlx5_ib_gsi_wr *wr;
79 for (index = gsi->outstanding_ci; index != gsi->outstanding_pi;
81 wr = &gsi->outstanding_wrs[index % gsi->cap.max_send_wr];
86 if (gsi->sq_sig_type == IB_SIGNAL_ALL_WR ||
87 wr->send_flags & IB_SEND_SIGNALED)
88 WARN_ON_ONCE(mlx5_ib_generate_wc(gsi_cq, &wr->wc));
90 wr->completed = false;
93 gsi->outstanding_ci = index;
96 static void handle_single_completion(struct ib_cq *cq, struct ib_wc *wc)
98 struct mlx5_ib_gsi_qp *gsi = cq->cq_context;
99 struct mlx5_ib_gsi_wr *wr =
100 container_of(wc->wr_cqe, struct mlx5_ib_gsi_wr, cqe);
104 spin_lock_irqsave(&gsi->lock, flags);
105 wr->completed = true;
106 wr_id = wr->wc.wr_id;
108 wr->wc.wr_id = wr_id;
109 wr->wc.qp = &gsi->ibqp;
111 generate_completions(gsi);
112 spin_unlock_irqrestore(&gsi->lock, flags);
115 struct ib_qp *mlx5_ib_gsi_create_qp(struct ib_pd *pd,
116 struct ib_qp_init_attr *init_attr)
118 struct mlx5_ib_dev *dev = to_mdev(pd->device);
119 struct mlx5_ib_gsi_qp *gsi;
120 struct ib_qp_init_attr hw_init_attr = *init_attr;
121 const u8 port_num = init_attr->port_num;
122 const int num_pkeys = pd->device->attrs.max_pkeys;
123 const int num_qps = mlx5_ib_deth_sqpn_cap(dev) ? num_pkeys : 0;
126 mlx5_ib_dbg(dev, "creating GSI QP\n");
128 if (port_num > ARRAY_SIZE(dev->devr.ports) || port_num < 1) {
130 "invalid port number %d during GSI QP creation\n",
132 return ERR_PTR(-EINVAL);
135 gsi = kzalloc(sizeof(*gsi), GFP_KERNEL);
137 return ERR_PTR(-ENOMEM);
139 gsi->tx_qps = kcalloc(num_qps, sizeof(*gsi->tx_qps), GFP_KERNEL);
145 gsi->outstanding_wrs = kcalloc(init_attr->cap.max_send_wr,
146 sizeof(*gsi->outstanding_wrs),
148 if (!gsi->outstanding_wrs) {
153 mutex_init(&gsi->mutex);
155 mutex_lock(&dev->devr.mutex);
157 if (dev->devr.ports[port_num - 1].gsi) {
158 mlx5_ib_warn(dev, "GSI QP already exists on port %d\n",
163 gsi->num_qps = num_qps;
164 spin_lock_init(&gsi->lock);
166 gsi->cap = init_attr->cap;
167 gsi->sq_sig_type = init_attr->sq_sig_type;
168 gsi->ibqp.qp_num = 1;
169 gsi->port_num = port_num;
171 gsi->cq = ib_alloc_cq(pd->device, gsi, init_attr->cap.max_send_wr, 0,
173 if (IS_ERR(gsi->cq)) {
174 mlx5_ib_warn(dev, "unable to create send CQ for GSI QP. error %ld\n",
176 ret = PTR_ERR(gsi->cq);
180 hw_init_attr.qp_type = MLX5_IB_QPT_HW_GSI;
181 hw_init_attr.send_cq = gsi->cq;
183 hw_init_attr.cap.max_send_wr = 0;
184 hw_init_attr.cap.max_send_sge = 0;
185 hw_init_attr.cap.max_inline_data = 0;
187 gsi->rx_qp = ib_create_qp(pd, &hw_init_attr);
188 if (IS_ERR(gsi->rx_qp)) {
189 mlx5_ib_warn(dev, "unable to create hardware GSI QP. error %ld\n",
190 PTR_ERR(gsi->rx_qp));
191 ret = PTR_ERR(gsi->rx_qp);
195 dev->devr.ports[init_attr->port_num - 1].gsi = gsi;
197 mutex_unlock(&dev->devr.mutex);
204 mutex_unlock(&dev->devr.mutex);
205 kfree(gsi->outstanding_wrs);
213 int mlx5_ib_gsi_destroy_qp(struct ib_qp *qp)
215 struct mlx5_ib_dev *dev = to_mdev(qp->device);
216 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
217 const int port_num = gsi->port_num;
221 mlx5_ib_dbg(dev, "destroying GSI QP\n");
223 mutex_lock(&dev->devr.mutex);
224 ret = ib_destroy_qp(gsi->rx_qp);
226 mlx5_ib_warn(dev, "unable to destroy hardware GSI QP. error %d\n",
228 mutex_unlock(&dev->devr.mutex);
231 dev->devr.ports[port_num - 1].gsi = NULL;
232 mutex_unlock(&dev->devr.mutex);
235 for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index) {
236 if (!gsi->tx_qps[qp_index])
238 WARN_ON_ONCE(ib_destroy_qp(gsi->tx_qps[qp_index]));
239 gsi->tx_qps[qp_index] = NULL;
244 kfree(gsi->outstanding_wrs);
251 static struct ib_qp *create_gsi_ud_qp(struct mlx5_ib_gsi_qp *gsi)
253 struct ib_pd *pd = gsi->rx_qp->pd;
254 struct ib_qp_init_attr init_attr = {
255 .event_handler = gsi->rx_qp->event_handler,
256 .qp_context = gsi->rx_qp->qp_context,
258 .recv_cq = gsi->rx_qp->recv_cq,
260 .max_send_wr = gsi->cap.max_send_wr,
261 .max_send_sge = gsi->cap.max_send_sge,
262 .max_inline_data = gsi->cap.max_inline_data,
264 .sq_sig_type = gsi->sq_sig_type,
265 .qp_type = IB_QPT_UD,
266 .create_flags = mlx5_ib_create_qp_sqpn_qp1(),
269 return ib_create_qp(pd, &init_attr);
272 static int modify_to_rts(struct mlx5_ib_gsi_qp *gsi, struct ib_qp *qp,
275 struct mlx5_ib_dev *dev = to_mdev(qp->device);
276 struct ib_qp_attr attr;
280 mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_QKEY | IB_QP_PORT;
281 attr.qp_state = IB_QPS_INIT;
282 attr.pkey_index = qp_index;
283 attr.qkey = IB_QP1_QKEY;
284 attr.port_num = gsi->port_num;
285 ret = ib_modify_qp(qp, &attr, mask);
287 mlx5_ib_err(dev, "could not change QP%d state to INIT: %d\n",
292 attr.qp_state = IB_QPS_RTR;
293 ret = ib_modify_qp(qp, &attr, IB_QP_STATE);
295 mlx5_ib_err(dev, "could not change QP%d state to RTR: %d\n",
300 attr.qp_state = IB_QPS_RTS;
302 ret = ib_modify_qp(qp, &attr, IB_QP_STATE | IB_QP_SQ_PSN);
304 mlx5_ib_err(dev, "could not change QP%d state to RTS: %d\n",
312 static void setup_qp(struct mlx5_ib_gsi_qp *gsi, u16 qp_index)
314 struct ib_device *device = gsi->rx_qp->device;
315 struct mlx5_ib_dev *dev = to_mdev(device);
321 ret = ib_query_pkey(device, gsi->port_num, qp_index, &pkey);
323 mlx5_ib_warn(dev, "unable to read P_Key at port %d, index %d\n",
324 gsi->port_num, qp_index);
329 mlx5_ib_dbg(dev, "invalid P_Key at port %d, index %d. Skipping.\n",
330 gsi->port_num, qp_index);
334 spin_lock_irqsave(&gsi->lock, flags);
335 qp = gsi->tx_qps[qp_index];
336 spin_unlock_irqrestore(&gsi->lock, flags);
338 mlx5_ib_dbg(dev, "already existing GSI TX QP at port %d, index %d. Skipping\n",
339 gsi->port_num, qp_index);
343 qp = create_gsi_ud_qp(gsi);
345 mlx5_ib_warn(dev, "unable to create hardware UD QP for GSI: %ld\n",
350 ret = modify_to_rts(gsi, qp, qp_index);
354 spin_lock_irqsave(&gsi->lock, flags);
355 WARN_ON_ONCE(gsi->tx_qps[qp_index]);
356 gsi->tx_qps[qp_index] = qp;
357 spin_unlock_irqrestore(&gsi->lock, flags);
365 static void setup_qps(struct mlx5_ib_gsi_qp *gsi)
369 for (qp_index = 0; qp_index < gsi->num_qps; ++qp_index)
370 setup_qp(gsi, qp_index);
373 int mlx5_ib_gsi_modify_qp(struct ib_qp *qp, struct ib_qp_attr *attr,
376 struct mlx5_ib_dev *dev = to_mdev(qp->device);
377 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
380 mlx5_ib_dbg(dev, "modifying GSI QP to state %d\n", attr->qp_state);
382 mutex_lock(&gsi->mutex);
383 ret = ib_modify_qp(gsi->rx_qp, attr, attr_mask);
385 mlx5_ib_warn(dev, "unable to modify GSI rx QP: %d\n", ret);
389 if (to_mqp(gsi->rx_qp)->state == IB_QPS_RTS)
393 mutex_unlock(&gsi->mutex);
398 int mlx5_ib_gsi_query_qp(struct ib_qp *qp, struct ib_qp_attr *qp_attr,
400 struct ib_qp_init_attr *qp_init_attr)
402 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
405 mutex_lock(&gsi->mutex);
406 ret = ib_query_qp(gsi->rx_qp, qp_attr, qp_attr_mask, qp_init_attr);
407 qp_init_attr->cap = gsi->cap;
408 mutex_unlock(&gsi->mutex);
413 /* Call with gsi->lock locked */
414 static int mlx5_ib_add_outstanding_wr(struct mlx5_ib_gsi_qp *gsi,
415 struct ib_ud_wr *wr, struct ib_wc *wc)
417 struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device);
418 struct mlx5_ib_gsi_wr *gsi_wr;
420 if (gsi->outstanding_pi == gsi->outstanding_ci + gsi->cap.max_send_wr) {
421 mlx5_ib_warn(dev, "no available GSI work request.\n");
425 gsi_wr = &gsi->outstanding_wrs[gsi->outstanding_pi %
426 gsi->cap.max_send_wr];
427 gsi->outstanding_pi++;
430 memset(&gsi_wr->wc, 0, sizeof(gsi_wr->wc));
431 gsi_wr->wc.pkey_index = wr->pkey_index;
432 gsi_wr->wc.wr_id = wr->wr.wr_id;
435 gsi_wr->completed = true;
438 gsi_wr->cqe.done = &handle_single_completion;
439 wr->wr.wr_cqe = &gsi_wr->cqe;
444 /* Call with gsi->lock locked */
445 static int mlx5_ib_gsi_silent_drop(struct mlx5_ib_gsi_qp *gsi,
449 { .wr_id = wr->wr.wr_id },
450 .status = IB_WC_SUCCESS,
451 .opcode = IB_WC_SEND,
456 ret = mlx5_ib_add_outstanding_wr(gsi, wr, &wc);
460 generate_completions(gsi);
465 /* Call with gsi->lock locked */
466 static struct ib_qp *get_tx_qp(struct mlx5_ib_gsi_qp *gsi, struct ib_ud_wr *wr)
468 struct mlx5_ib_dev *dev = to_mdev(gsi->rx_qp->device);
469 int qp_index = wr->pkey_index;
471 if (!mlx5_ib_deth_sqpn_cap(dev))
474 if (qp_index >= gsi->num_qps)
477 return gsi->tx_qps[qp_index];
480 int mlx5_ib_gsi_post_send(struct ib_qp *qp, struct ib_send_wr *wr,
481 struct ib_send_wr **bad_wr)
483 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
488 for (; wr; wr = wr->next) {
489 struct ib_ud_wr cur_wr = *ud_wr(wr);
491 cur_wr.wr.next = NULL;
493 spin_lock_irqsave(&gsi->lock, flags);
494 tx_qp = get_tx_qp(gsi, &cur_wr);
496 ret = mlx5_ib_gsi_silent_drop(gsi, &cur_wr);
499 spin_unlock_irqrestore(&gsi->lock, flags);
503 ret = mlx5_ib_add_outstanding_wr(gsi, &cur_wr, NULL);
507 ret = ib_post_send(tx_qp, &cur_wr.wr, bad_wr);
509 /* Undo the effect of adding the outstanding wr */
510 gsi->outstanding_pi--;
513 spin_unlock_irqrestore(&gsi->lock, flags);
519 spin_unlock_irqrestore(&gsi->lock, flags);
524 int mlx5_ib_gsi_post_recv(struct ib_qp *qp, struct ib_recv_wr *wr,
525 struct ib_recv_wr **bad_wr)
527 struct mlx5_ib_gsi_qp *gsi = gsi_qp(qp);
529 return ib_post_recv(gsi->rx_qp, wr, bad_wr);
532 void mlx5_ib_gsi_pkey_change(struct mlx5_ib_gsi_qp *gsi)
537 mutex_lock(&gsi->mutex);
539 mutex_unlock(&gsi->mutex);