1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* Copyright (c) 2019 Mellanox Technologies. */
8 #include <net/xdp_sock_drv.h>
10 static int mlx5e_legacy_rq_validate_xsk(struct mlx5_core_dev *mdev,
11 struct mlx5e_params *params,
12 struct mlx5e_xsk_param *xsk)
14 if (!mlx5e_rx_is_linear_skb(mdev, params, xsk)) {
15 mlx5_core_err(mdev, "Legacy RQ linear mode for XSK can't be activated with current params\n");
22 /* The limitation of 2048 can be altered, but shouldn't go beyond the minimal
23 * stride size of striding RQ.
25 #define MLX5E_MIN_XSK_CHUNK_SIZE max(2048, XDP_UMEM_MIN_CHUNK_SIZE)
27 bool mlx5e_validate_xsk_param(struct mlx5e_params *params,
28 struct mlx5e_xsk_param *xsk,
29 struct mlx5_core_dev *mdev)
31 /* AF_XDP doesn't support frames larger than PAGE_SIZE. */
32 if (xsk->chunk_size > PAGE_SIZE || xsk->chunk_size < MLX5E_MIN_XSK_CHUNK_SIZE) {
33 mlx5_core_err(mdev, "XSK chunk size %u out of bounds [%u, %lu]\n", xsk->chunk_size,
34 MLX5E_MIN_XSK_CHUNK_SIZE, PAGE_SIZE);
38 /* frag_sz is different for regular and XSK RQs, so ensure that linear
39 * SKB mode is possible.
41 switch (params->rq_wq_type) {
42 case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ:
43 return !mlx5e_mpwrq_validate_xsk(mdev, params, xsk);
44 default: /* MLX5_WQ_TYPE_CYCLIC */
45 return !mlx5e_legacy_rq_validate_xsk(mdev, params, xsk);
49 static void mlx5e_build_xsk_cparam(struct mlx5_core_dev *mdev,
50 struct mlx5e_params *params,
51 struct mlx5e_xsk_param *xsk,
53 struct mlx5e_channel_param *cparam)
55 mlx5e_build_rq_param(mdev, params, xsk, q_counter, &cparam->rq);
56 mlx5e_build_xdpsq_param(mdev, params, xsk, &cparam->xdp_sq);
59 static int mlx5e_init_xsk_rq(struct mlx5e_channel *c,
60 struct mlx5e_params *params,
61 struct xsk_buff_pool *pool,
62 struct mlx5e_xsk_param *xsk,
65 struct mlx5_core_dev *mdev = c->mdev;
69 rq->wq_type = params->rq_wq_type;
71 rq->netdev = c->netdev;
73 rq->tstamp = c->tstamp;
74 rq->clock = &mdev->clock;
75 rq->icosq = &c->icosq;
79 rq->hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
80 rq->xdpsq = &c->rq_xdpsq;
82 rq->stats = &c->priv->channel_stats[c->ix]->xskrq;
83 rq->ptp_cyc2time = mlx5_rq_ts_translator(mdev);
85 err = mlx5e_rq_set_handlers(rq, params, xsk);
89 return xdp_rxq_info_reg(&rq->xdp_rxq, rq->netdev, rq_xdp_ix, c->napi.napi_id);
92 static int mlx5e_open_xsk_rq(struct mlx5e_channel *c, struct mlx5e_params *params,
93 struct mlx5e_rq_param *rq_params, struct xsk_buff_pool *pool,
94 struct mlx5e_xsk_param *xsk)
96 struct mlx5e_rq *xskrq = &c->xskrq;
99 err = mlx5e_init_xsk_rq(c, params, pool, xsk, xskrq);
103 err = mlx5e_open_rq(params, rq_params, xsk, cpu_to_node(c->cpu), xskrq);
107 __set_bit(MLX5E_RQ_STATE_XSK, &xskrq->state);
111 int mlx5e_open_xsk(struct mlx5e_priv *priv, struct mlx5e_params *params,
112 struct mlx5e_xsk_param *xsk, struct xsk_buff_pool *pool,
113 struct mlx5e_channel *c)
115 struct mlx5e_channel_param *cparam;
116 struct mlx5e_create_cq_param ccp;
119 mlx5e_build_create_cq_param(&ccp, c);
121 if (!mlx5e_validate_xsk_param(params, xsk, priv->mdev))
124 cparam = kvzalloc(sizeof(*cparam), GFP_KERNEL);
128 mlx5e_build_xsk_cparam(priv->mdev, params, xsk, priv->q_counter, cparam);
130 err = mlx5e_open_cq(c->mdev, params->rx_cq_moderation, &cparam->rq.cqp, &ccp,
133 goto err_free_cparam;
135 err = mlx5e_open_xsk_rq(c, params, &cparam->rq, pool, xsk);
137 goto err_close_rx_cq;
139 err = mlx5e_open_cq(c->mdev, params->tx_cq_moderation, &cparam->xdp_sq.cqp, &ccp,
144 /* Create a separate SQ, so that when the buff pool is disabled, we could
145 * close this SQ safely and stop receiving CQEs. In other case, e.g., if
146 * the XDPSQ was used instead, we might run into trouble when the buff pool
147 * is disabled and then re-enabled, but the SQ continues receiving CQEs
148 * from the old buff pool.
150 err = mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, pool, &c->xsksq, true);
152 goto err_close_tx_cq;
156 set_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
161 mlx5e_close_cq(&c->xsksq.cq);
164 mlx5e_close_rq(&c->xskrq);
167 mlx5e_close_cq(&c->xskrq.cq);
175 void mlx5e_close_xsk(struct mlx5e_channel *c)
177 clear_bit(MLX5E_CHANNEL_STATE_XSK, c->state);
178 synchronize_net(); /* Sync with NAPI. */
180 mlx5e_close_rq(&c->xskrq);
181 mlx5e_close_cq(&c->xskrq.cq);
182 mlx5e_close_xdpsq(&c->xsksq);
183 mlx5e_close_cq(&c->xsksq.cq);
185 memset(&c->xskrq, 0, sizeof(c->xskrq));
186 memset(&c->xsksq, 0, sizeof(c->xsksq));
189 void mlx5e_activate_xsk(struct mlx5e_channel *c)
191 /* ICOSQ recovery deactivates RQs. Suspend the recovery to avoid
192 * activating XSKRQ in the middle of recovery.
194 mlx5e_reporter_icosq_suspend_recovery(c);
195 set_bit(MLX5E_RQ_STATE_ENABLED, &c->xskrq.state);
196 mlx5e_reporter_icosq_resume_recovery(c);
198 /* TX queue is created active. */
201 void mlx5e_deactivate_xsk(struct mlx5e_channel *c)
203 /* ICOSQ recovery may reactivate XSKRQ if clear_bit is called in the
204 * middle of recovery. Suspend the recovery to avoid it.
206 mlx5e_reporter_icosq_suspend_recovery(c);
207 clear_bit(MLX5E_RQ_STATE_ENABLED, &c->xskrq.state);
208 mlx5e_reporter_icosq_resume_recovery(c);
209 synchronize_net(); /* Sync with NAPI to prevent mlx5e_post_rx_wqes. */
211 /* TX queue is disabled on close. */