1 /*
2 * Copyright (c) 2015, 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
33 #include <linux/irq.h>
34 #include <net/xdp_sock_drv.h>
35 #include "en.h"
36 #include "en/txrx.h"
37 #include "en/xdp.h"
38 #include "en/xsk/rx.h"
39 #include "en/xsk/tx.h"
40 #include "en_accel/ktls_txrx.h"
41
mlx5e_channel_no_affinity_change(struct mlx5e_channel * c)42 static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
43 {
44 int current_cpu = smp_processor_id();
45
46 return cpumask_test_cpu(current_cpu, c->aff_mask);
47 }
48
mlx5e_handle_tx_dim(struct mlx5e_txqsq * sq)49 static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
50 {
51 struct mlx5e_sq_stats *stats = sq->stats;
52 struct dim_sample dim_sample = {};
53
54 if (unlikely(!test_bit(MLX5E_SQ_STATE_AM, &sq->state)))
55 return;
56
57 dim_update_sample(sq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
58 net_dim(&sq->dim, dim_sample);
59 }
60
mlx5e_handle_rx_dim(struct mlx5e_rq * rq)61 static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
62 {
63 struct mlx5e_rq_stats *stats = rq->stats;
64 struct dim_sample dim_sample = {};
65
66 if (unlikely(!test_bit(MLX5E_RQ_STATE_AM, &rq->state)))
67 return;
68
69 dim_update_sample(rq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
70 net_dim(&rq->dim, dim_sample);
71 }
72
mlx5e_trigger_irq(struct mlx5e_icosq * sq)73 void mlx5e_trigger_irq(struct mlx5e_icosq *sq)
74 {
75 struct mlx5_wq_cyc *wq = &sq->wq;
76 struct mlx5e_tx_wqe *nopwqe;
77 u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
78
79 sq->db.wqe_info[pi] = (struct mlx5e_icosq_wqe_info) {
80 .wqe_type = MLX5E_ICOSQ_WQE_NOP,
81 .num_wqebbs = 1,
82 };
83
84 nopwqe = mlx5e_post_nop(wq, sq->sqn, &sq->pc);
85 mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &nopwqe->ctrl);
86 }
87
mlx5e_napi_xsk_post(struct mlx5e_xdpsq * xsksq,struct mlx5e_rq * xskrq)88 static bool mlx5e_napi_xsk_post(struct mlx5e_xdpsq *xsksq, struct mlx5e_rq *xskrq)
89 {
90 bool need_wakeup = xsk_uses_need_wakeup(xskrq->xsk_pool);
91 bool busy_xsk = false, xsk_rx_alloc_err;
92
93 /* If SQ is empty, there are no TX completions to trigger NAPI, so set
94 * need_wakeup. Do it before queuing packets for TX to avoid race
95 * condition with userspace.
96 */
97 if (need_wakeup && xsksq->pc == xsksq->cc)
98 xsk_set_tx_need_wakeup(xsksq->xsk_pool);
99 busy_xsk |= mlx5e_xsk_tx(xsksq, MLX5E_TX_XSK_POLL_BUDGET);
100 /* If we queued some packets for TX, no need for wakeup anymore. */
101 if (need_wakeup && xsksq->pc != xsksq->cc)
102 xsk_clear_tx_need_wakeup(xsksq->xsk_pool);
103
104 /* If WQ is empty, RX won't trigger NAPI, so set need_wakeup. Do it
105 * before refilling to avoid race condition with userspace.
106 */
107 if (need_wakeup && !mlx5e_rqwq_get_cur_sz(xskrq))
108 xsk_set_rx_need_wakeup(xskrq->xsk_pool);
109 xsk_rx_alloc_err = INDIRECT_CALL_2(xskrq->post_wqes,
110 mlx5e_post_rx_mpwqes,
111 mlx5e_post_rx_wqes,
112 xskrq);
113 /* Ask for wakeup if WQ is not full after refill. */
114 if (!need_wakeup)
115 busy_xsk |= xsk_rx_alloc_err;
116 else if (xsk_rx_alloc_err)
117 xsk_set_rx_need_wakeup(xskrq->xsk_pool);
118 else
119 xsk_clear_rx_need_wakeup(xskrq->xsk_pool);
120
121 return busy_xsk;
122 }
123
mlx5e_napi_poll(struct napi_struct * napi,int budget)124 int mlx5e_napi_poll(struct napi_struct *napi, int budget)
125 {
126 struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
127 napi);
128 struct mlx5e_ch_stats *ch_stats = c->stats;
129 struct mlx5e_xdpsq *xsksq = &c->xsksq;
130 struct mlx5e_txqsq __rcu **qos_sqs;
131 struct mlx5e_rq *xskrq = &c->xskrq;
132 struct mlx5e_rq *rq = &c->rq;
133 bool aff_change = false;
134 bool busy_xsk = false;
135 bool busy = false;
136 int work_done = 0;
137 u16 qos_sqs_size;
138 bool xsk_open;
139 int i;
140
141 rcu_read_lock();
142
143 qos_sqs = rcu_dereference(c->qos_sqs);
144
145 xsk_open = test_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
146
147 ch_stats->poll++;
148
149 for (i = 0; i < c->num_tc; i++)
150 busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);
151
152 if (unlikely(qos_sqs)) {
153 smp_rmb(); /* Pairs with mlx5e_qos_alloc_queues. */
154 qos_sqs_size = READ_ONCE(c->qos_sqs_size);
155
156 for (i = 0; i < qos_sqs_size; i++) {
157 struct mlx5e_txqsq *sq = rcu_dereference(qos_sqs[i]);
158
159 if (sq)
160 busy |= mlx5e_poll_tx_cq(&sq->cq, budget);
161 }
162 }
163
164 busy |= mlx5e_poll_xdpsq_cq(&c->xdpsq.cq);
165
166 if (c->xdp)
167 busy |= mlx5e_poll_xdpsq_cq(&c->rq_xdpsq.cq);
168
169 if (likely(budget)) { /* budget=0 means: don't poll rx rings */
170 if (xsk_open)
171 work_done = mlx5e_poll_rx_cq(&xskrq->cq, budget);
172
173 if (likely(budget - work_done))
174 work_done += mlx5e_poll_rx_cq(&rq->cq, budget - work_done);
175
176 busy |= work_done == budget;
177 }
178
179 mlx5e_poll_ico_cq(&c->icosq.cq);
180 if (mlx5e_poll_ico_cq(&c->async_icosq.cq))
181 /* Don't clear the flag if nothing was polled to prevent
182 * queueing more WQEs and overflowing the async ICOSQ.
183 */
184 clear_bit(MLX5E_SQ_STATE_PENDING_XSK_TX, &c->async_icosq.state);
185
186 /* Keep after async ICOSQ CQ poll */
187 if (unlikely(mlx5e_ktls_rx_pending_resync_list(c, budget)))
188 busy |= mlx5e_ktls_rx_handle_resync_list(c, budget);
189
190 busy |= INDIRECT_CALL_2(rq->post_wqes,
191 mlx5e_post_rx_mpwqes,
192 mlx5e_post_rx_wqes,
193 rq);
194 if (xsk_open) {
195 busy |= mlx5e_poll_xdpsq_cq(&xsksq->cq);
196 busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
197 }
198
199 busy |= busy_xsk;
200
201 if (busy) {
202 if (likely(mlx5e_channel_no_affinity_change(c))) {
203 work_done = budget;
204 goto out;
205 }
206 ch_stats->aff_change++;
207 aff_change = true;
208 if (budget && work_done == budget)
209 work_done--;
210 }
211
212 if (unlikely(!napi_complete_done(napi, work_done)))
213 goto out;
214
215 ch_stats->arm++;
216
217 for (i = 0; i < c->num_tc; i++) {
218 mlx5e_handle_tx_dim(&c->sq[i]);
219 mlx5e_cq_arm(&c->sq[i].cq);
220 }
221 if (unlikely(qos_sqs)) {
222 for (i = 0; i < qos_sqs_size; i++) {
223 struct mlx5e_txqsq *sq = rcu_dereference(qos_sqs[i]);
224
225 if (sq) {
226 mlx5e_handle_tx_dim(sq);
227 mlx5e_cq_arm(&sq->cq);
228 }
229 }
230 }
231
232 mlx5e_handle_rx_dim(rq);
233
234 mlx5e_cq_arm(&rq->cq);
235 mlx5e_cq_arm(&c->icosq.cq);
236 mlx5e_cq_arm(&c->async_icosq.cq);
237 mlx5e_cq_arm(&c->xdpsq.cq);
238
239 if (xsk_open) {
240 mlx5e_handle_rx_dim(xskrq);
241 mlx5e_cq_arm(&xsksq->cq);
242 mlx5e_cq_arm(&xskrq->cq);
243 }
244
245 if (unlikely(aff_change && busy_xsk)) {
246 mlx5e_trigger_irq(&c->icosq);
247 ch_stats->force_irq++;
248 }
249
250 out:
251 rcu_read_unlock();
252
253 return work_done;
254 }
255
mlx5e_completion_event(struct mlx5_core_cq * mcq,struct mlx5_eqe * eqe)256 void mlx5e_completion_event(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
257 {
258 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
259
260 napi_schedule(cq->napi);
261 cq->event_ctr++;
262 cq->ch_stats->events++;
263 }
264
mlx5e_cq_error_event(struct mlx5_core_cq * mcq,enum mlx5_event event)265 void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event)
266 {
267 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
268 struct net_device *netdev = cq->netdev;
269
270 netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n",
271 __func__, mcq->cqn, event);
272 }
273