2 * Copyright (c) 2015, Mellanox Technologies. All rights reserved.
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6 * General Public License (GPL) Version 2, available from the file
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8 * OpenIB.org BSD license below:
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11 * without modification, are permitted provided that the following
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15 * copyright notice, this list of conditions and the following
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19 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #include <linux/irq.h>
36 #include "en/xsk/rx.h"
37 #include "en/xsk/tx.h"
39 static inline bool mlx5e_channel_no_affinity_change(struct mlx5e_channel *c)
41 int current_cpu = smp_processor_id();
42 const struct cpumask *aff;
43 struct irq_data *idata;
45 idata = irq_desc_get_irq_data(c->irq_desc);
46 aff = irq_data_get_affinity_mask(idata);
47 return cpumask_test_cpu(current_cpu, aff);
50 static void mlx5e_handle_tx_dim(struct mlx5e_txqsq *sq)
52 struct mlx5e_sq_stats *stats = sq->stats;
53 struct dim_sample dim_sample = {};
55 if (unlikely(!test_bit(MLX5E_SQ_STATE_AM, &sq->state)))
58 dim_update_sample(sq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
59 net_dim(&sq->dim, dim_sample);
62 static void mlx5e_handle_rx_dim(struct mlx5e_rq *rq)
64 struct mlx5e_rq_stats *stats = rq->stats;
65 struct dim_sample dim_sample = {};
67 if (unlikely(!test_bit(MLX5E_RQ_STATE_AM, &rq->state)))
70 dim_update_sample(rq->cq.event_ctr, stats->packets, stats->bytes, &dim_sample);
71 net_dim(&rq->dim, dim_sample);
74 void mlx5e_trigger_irq(struct mlx5e_icosq *sq)
76 struct mlx5_wq_cyc *wq = &sq->wq;
77 struct mlx5e_tx_wqe *nopwqe;
78 u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);
80 sq->db.ico_wqe[pi].opcode = MLX5_OPCODE_NOP;
81 sq->db.ico_wqe[pi].num_wqebbs = 1;
82 nopwqe = mlx5e_post_nop(wq, sq->sqn, &sq->pc);
83 mlx5e_notify_hw(wq, sq->pc, sq->uar_map, &nopwqe->ctrl);
86 static bool mlx5e_napi_xsk_post(struct mlx5e_xdpsq *xsksq, struct mlx5e_rq *xskrq)
88 bool busy_xsk = false, xsk_rx_alloc_err;
90 /* Handle the race between the application querying need_wakeup and the
92 * 1. Update need_wakeup both before and after the TX. If it goes to
93 * "yes", it can only happen with the first update.
94 * 2. If the application queried need_wakeup before we set it, the
95 * packets will be transmitted anyway, even w/o a wakeup.
96 * 3. Give a chance to clear need_wakeup after new packets were queued
99 mlx5e_xsk_update_tx_wakeup(xsksq);
100 busy_xsk |= mlx5e_xsk_tx(xsksq, MLX5E_TX_XSK_POLL_BUDGET);
101 mlx5e_xsk_update_tx_wakeup(xsksq);
103 xsk_rx_alloc_err = xskrq->post_wqes(xskrq);
104 busy_xsk |= mlx5e_xsk_update_rx_wakeup(xskrq, xsk_rx_alloc_err);
109 int mlx5e_napi_poll(struct napi_struct *napi, int budget)
111 struct mlx5e_channel *c = container_of(napi, struct mlx5e_channel,
113 struct mlx5e_ch_stats *ch_stats = c->stats;
114 struct mlx5e_xdpsq *xsksq = &c->xsksq;
115 struct mlx5e_rq *xskrq = &c->xskrq;
116 struct mlx5e_rq *rq = &c->rq;
117 bool xsk_open = test_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
118 bool aff_change = false;
119 bool busy_xsk = false;
126 for (i = 0; i < c->num_tc; i++)
127 busy |= mlx5e_poll_tx_cq(&c->sq[i].cq, budget);
129 busy |= mlx5e_poll_xdpsq_cq(&c->xdpsq.cq);
132 busy |= mlx5e_poll_xdpsq_cq(&c->rq_xdpsq.cq);
134 if (likely(budget)) { /* budget=0 means: don't poll rx rings */
136 work_done = mlx5e_poll_rx_cq(&xskrq->cq, budget);
138 if (likely(budget - work_done))
139 work_done += mlx5e_poll_rx_cq(&rq->cq, budget - work_done);
141 busy |= work_done == budget;
144 mlx5e_poll_ico_cq(&c->icosq.cq);
146 busy |= rq->post_wqes(rq);
148 if (mlx5e_poll_ico_cq(&c->xskicosq.cq))
149 /* Don't clear the flag if nothing was polled to prevent
150 * queueing more WQEs and overflowing XSKICOSQ.
152 clear_bit(MLX5E_SQ_STATE_PENDING_XSK_TX, &c->xskicosq.state);
153 busy |= mlx5e_poll_xdpsq_cq(&xsksq->cq);
154 busy_xsk |= mlx5e_napi_xsk_post(xsksq, xskrq);
160 if (likely(mlx5e_channel_no_affinity_change(c)))
162 ch_stats->aff_change++;
164 if (budget && work_done == budget)
168 if (unlikely(!napi_complete_done(napi, work_done)))
173 for (i = 0; i < c->num_tc; i++) {
174 mlx5e_handle_tx_dim(&c->sq[i]);
175 mlx5e_cq_arm(&c->sq[i].cq);
178 mlx5e_handle_rx_dim(rq);
180 mlx5e_cq_arm(&rq->cq);
181 mlx5e_cq_arm(&c->icosq.cq);
182 mlx5e_cq_arm(&c->xdpsq.cq);
185 mlx5e_handle_rx_dim(xskrq);
186 mlx5e_cq_arm(&c->xskicosq.cq);
187 mlx5e_cq_arm(&xsksq->cq);
188 mlx5e_cq_arm(&xskrq->cq);
191 if (unlikely(aff_change && busy_xsk)) {
192 mlx5e_trigger_irq(&c->icosq);
193 ch_stats->force_irq++;
199 void mlx5e_completion_event(struct mlx5_core_cq *mcq, struct mlx5_eqe *eqe)
201 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
203 napi_schedule(cq->napi);
205 cq->channel->stats->events++;
208 void mlx5e_cq_error_event(struct mlx5_core_cq *mcq, enum mlx5_event event)
210 struct mlx5e_cq *cq = container_of(mcq, struct mlx5e_cq, mcq);
211 struct mlx5e_channel *c = cq->channel;
212 struct net_device *netdev = c->netdev;
214 netdev_err(netdev, "%s: cqn=0x%.6x event=0x%.2x\n",
215 __func__, mcq->cqn, event);