1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* Copyright (c) 2020 Mellanox Technologies */
3
4 #include <net/page_pool.h>
5 #include "en/txrx.h"
6 #include "en/params.h"
7 #include "en/trap.h"
8
mlx5e_trap_napi_poll(struct napi_struct * napi,int budget)9 static int mlx5e_trap_napi_poll(struct napi_struct *napi, int budget)
10 {
11 struct mlx5e_trap *trap_ctx = container_of(napi, struct mlx5e_trap, napi);
12 struct mlx5e_ch_stats *ch_stats = trap_ctx->stats;
13 struct mlx5e_rq *rq = &trap_ctx->rq;
14 bool busy = false;
15 int work_done = 0;
16
17 rcu_read_lock();
18
19 ch_stats->poll++;
20
21 work_done = mlx5e_poll_rx_cq(&rq->cq, budget);
22 busy |= work_done == budget;
23 busy |= rq->post_wqes(rq);
24
25 if (busy) {
26 work_done = budget;
27 goto out;
28 }
29
30 if (unlikely(!napi_complete_done(napi, work_done)))
31 goto out;
32
33 mlx5e_cq_arm(&rq->cq);
34
35 out:
36 rcu_read_unlock();
37 return work_done;
38 }
39
mlx5e_init_trap_rq(struct mlx5e_trap * t,struct mlx5e_params * params,struct mlx5e_rq * rq)40 static void mlx5e_init_trap_rq(struct mlx5e_trap *t, struct mlx5e_params *params,
41 struct mlx5e_rq *rq)
42 {
43 struct mlx5_core_dev *mdev = t->mdev;
44 struct mlx5e_priv *priv = t->priv;
45
46 rq->wq_type = params->rq_wq_type;
47 rq->pdev = t->pdev;
48 rq->netdev = priv->netdev;
49 rq->priv = priv;
50 rq->clock = &mdev->clock;
51 rq->tstamp = &priv->tstamp;
52 rq->mdev = mdev;
53 rq->hw_mtu = MLX5E_SW2HW_MTU(params, params->sw_mtu);
54 rq->stats = &priv->trap_stats.rq;
55 rq->ptp_cyc2time = mlx5_rq_ts_translator(mdev);
56 xdp_rxq_info_unused(&rq->xdp_rxq);
57 mlx5e_rq_set_trap_handlers(rq, params);
58 }
59
mlx5e_open_trap_rq(struct mlx5e_priv * priv,struct mlx5e_trap * t)60 static int mlx5e_open_trap_rq(struct mlx5e_priv *priv, struct mlx5e_trap *t)
61 {
62 struct mlx5e_rq_param *rq_param = &t->rq_param;
63 struct mlx5_core_dev *mdev = priv->mdev;
64 struct mlx5e_create_cq_param ccp = {};
65 struct dim_cq_moder trap_moder = {};
66 struct mlx5e_rq *rq = &t->rq;
67 int node;
68 int err;
69
70 node = dev_to_node(mdev->device);
71
72 ccp.node = node;
73 ccp.ch_stats = t->stats;
74 ccp.napi = &t->napi;
75 ccp.ix = 0;
76 err = mlx5e_open_cq(priv, trap_moder, &rq_param->cqp, &ccp, &rq->cq);
77 if (err)
78 return err;
79
80 mlx5e_init_trap_rq(t, &t->params, rq);
81 err = mlx5e_open_rq(&t->params, rq_param, NULL, node, rq);
82 if (err)
83 goto err_destroy_cq;
84
85 return 0;
86
87 err_destroy_cq:
88 mlx5e_close_cq(&rq->cq);
89
90 return err;
91 }
92
mlx5e_close_trap_rq(struct mlx5e_rq * rq)93 static void mlx5e_close_trap_rq(struct mlx5e_rq *rq)
94 {
95 mlx5e_close_rq(rq);
96 mlx5e_close_cq(&rq->cq);
97 }
98
mlx5e_create_trap_direct_rq_tir(struct mlx5_core_dev * mdev,struct mlx5e_tir * tir,u32 rqn)99 static int mlx5e_create_trap_direct_rq_tir(struct mlx5_core_dev *mdev, struct mlx5e_tir *tir,
100 u32 rqn)
101 {
102 struct mlx5e_tir_builder *builder;
103 int err;
104
105 builder = mlx5e_tir_builder_alloc(false);
106 if (!builder)
107 return -ENOMEM;
108
109 mlx5e_tir_builder_build_inline(builder, mdev->mlx5e_res.hw_objs.td.tdn, rqn);
110 err = mlx5e_tir_init(tir, builder, mdev, true);
111
112 mlx5e_tir_builder_free(builder);
113
114 return err;
115 }
116
mlx5e_build_trap_params(struct mlx5_core_dev * mdev,int max_mtu,u16 q_counter,struct mlx5e_trap * t)117 static void mlx5e_build_trap_params(struct mlx5_core_dev *mdev,
118 int max_mtu, u16 q_counter,
119 struct mlx5e_trap *t)
120 {
121 struct mlx5e_params *params = &t->params;
122
123 params->rq_wq_type = MLX5_WQ_TYPE_CYCLIC;
124 mlx5e_init_rq_type_params(mdev, params);
125 params->sw_mtu = max_mtu;
126 mlx5e_build_rq_param(mdev, params, NULL, q_counter, &t->rq_param);
127 }
128
mlx5e_open_trap(struct mlx5e_priv * priv)129 static struct mlx5e_trap *mlx5e_open_trap(struct mlx5e_priv *priv)
130 {
131 int cpu = cpumask_first(mlx5_comp_irq_get_affinity_mask(priv->mdev, 0));
132 struct net_device *netdev = priv->netdev;
133 struct mlx5e_trap *t;
134 int err;
135
136 t = kvzalloc_node(sizeof(*t), GFP_KERNEL, cpu_to_node(cpu));
137 if (!t)
138 return ERR_PTR(-ENOMEM);
139
140 mlx5e_build_trap_params(priv->mdev, netdev->max_mtu, priv->q_counter, t);
141
142 t->priv = priv;
143 t->mdev = priv->mdev;
144 t->tstamp = &priv->tstamp;
145 t->pdev = mlx5_core_dma_dev(priv->mdev);
146 t->netdev = priv->netdev;
147 t->mkey_be = cpu_to_be32(priv->mdev->mlx5e_res.hw_objs.mkey);
148 t->stats = &priv->trap_stats.ch;
149
150 netif_napi_add(netdev, &t->napi, mlx5e_trap_napi_poll);
151
152 err = mlx5e_open_trap_rq(priv, t);
153 if (unlikely(err))
154 goto err_napi_del;
155
156 err = mlx5e_create_trap_direct_rq_tir(t->mdev, &t->tir, t->rq.rqn);
157 if (err)
158 goto err_close_trap_rq;
159
160 return t;
161
162 err_close_trap_rq:
163 mlx5e_close_trap_rq(&t->rq);
164 err_napi_del:
165 netif_napi_del(&t->napi);
166 kvfree(t);
167 return ERR_PTR(err);
168 }
169
mlx5e_close_trap(struct mlx5e_trap * trap)170 void mlx5e_close_trap(struct mlx5e_trap *trap)
171 {
172 mlx5e_tir_destroy(&trap->tir);
173 mlx5e_close_trap_rq(&trap->rq);
174 netif_napi_del(&trap->napi);
175 kvfree(trap);
176 }
177
mlx5e_activate_trap(struct mlx5e_trap * trap)178 static void mlx5e_activate_trap(struct mlx5e_trap *trap)
179 {
180 napi_enable(&trap->napi);
181 mlx5e_activate_rq(&trap->rq);
182 mlx5e_trigger_napi_sched(&trap->napi);
183 }
184
mlx5e_deactivate_trap(struct mlx5e_priv * priv)185 void mlx5e_deactivate_trap(struct mlx5e_priv *priv)
186 {
187 struct mlx5e_trap *trap = priv->en_trap;
188
189 mlx5e_deactivate_rq(&trap->rq);
190 napi_disable(&trap->napi);
191 }
192
mlx5e_add_trap_queue(struct mlx5e_priv * priv)193 static struct mlx5e_trap *mlx5e_add_trap_queue(struct mlx5e_priv *priv)
194 {
195 struct mlx5e_trap *trap;
196
197 trap = mlx5e_open_trap(priv);
198 if (IS_ERR(trap))
199 goto out;
200
201 mlx5e_activate_trap(trap);
202 out:
203 return trap;
204 }
205
mlx5e_del_trap_queue(struct mlx5e_priv * priv)206 static void mlx5e_del_trap_queue(struct mlx5e_priv *priv)
207 {
208 mlx5e_deactivate_trap(priv);
209 mlx5e_close_trap(priv->en_trap);
210 priv->en_trap = NULL;
211 }
212
mlx5e_trap_get_tirn(struct mlx5e_trap * en_trap)213 static int mlx5e_trap_get_tirn(struct mlx5e_trap *en_trap)
214 {
215 return en_trap->tir.tirn;
216 }
217
mlx5e_handle_action_trap(struct mlx5e_priv * priv,int trap_id)218 static int mlx5e_handle_action_trap(struct mlx5e_priv *priv, int trap_id)
219 {
220 bool open_queue = !priv->en_trap;
221 struct mlx5e_trap *trap;
222 int err;
223
224 if (open_queue) {
225 trap = mlx5e_add_trap_queue(priv);
226 if (IS_ERR(trap))
227 return PTR_ERR(trap);
228 priv->en_trap = trap;
229 }
230
231 switch (trap_id) {
232 case DEVLINK_TRAP_GENERIC_ID_INGRESS_VLAN_FILTER:
233 err = mlx5e_add_vlan_trap(priv->fs, trap_id, mlx5e_trap_get_tirn(priv->en_trap));
234 if (err)
235 goto err_out;
236 break;
237 case DEVLINK_TRAP_GENERIC_ID_DMAC_FILTER:
238 err = mlx5e_add_mac_trap(priv->fs, trap_id, mlx5e_trap_get_tirn(priv->en_trap));
239 if (err)
240 goto err_out;
241 break;
242 default:
243 netdev_warn(priv->netdev, "%s: Unknown trap id %d\n", __func__, trap_id);
244 err = -EINVAL;
245 goto err_out;
246 }
247 return 0;
248
249 err_out:
250 if (open_queue)
251 mlx5e_del_trap_queue(priv);
252 return err;
253 }
254
mlx5e_handle_action_drop(struct mlx5e_priv * priv,int trap_id)255 static int mlx5e_handle_action_drop(struct mlx5e_priv *priv, int trap_id)
256 {
257 switch (trap_id) {
258 case DEVLINK_TRAP_GENERIC_ID_INGRESS_VLAN_FILTER:
259 mlx5e_remove_vlan_trap(priv->fs);
260 break;
261 case DEVLINK_TRAP_GENERIC_ID_DMAC_FILTER:
262 mlx5e_remove_mac_trap(priv->fs);
263 break;
264 default:
265 netdev_warn(priv->netdev, "%s: Unknown trap id %d\n", __func__, trap_id);
266 return -EINVAL;
267 }
268 if (priv->en_trap && !mlx5_devlink_trap_get_num_active(priv->mdev))
269 mlx5e_del_trap_queue(priv);
270
271 return 0;
272 }
273
mlx5e_handle_trap_event(struct mlx5e_priv * priv,struct mlx5_trap_ctx * trap_ctx)274 int mlx5e_handle_trap_event(struct mlx5e_priv *priv, struct mlx5_trap_ctx *trap_ctx)
275 {
276 int err = 0;
277
278 /* Traps are unarmed when interface is down, no need to update
279 * them. The configuration is saved in the core driver,
280 * queried and applied upon interface up operation in
281 * mlx5e_open_locked().
282 */
283 if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
284 return 0;
285
286 switch (trap_ctx->action) {
287 case DEVLINK_TRAP_ACTION_TRAP:
288 err = mlx5e_handle_action_trap(priv, trap_ctx->id);
289 break;
290 case DEVLINK_TRAP_ACTION_DROP:
291 err = mlx5e_handle_action_drop(priv, trap_ctx->id);
292 break;
293 default:
294 netdev_warn(priv->netdev, "%s: Unsupported action %d\n", __func__,
295 trap_ctx->action);
296 err = -EINVAL;
297 }
298 return err;
299 }
300
mlx5e_apply_trap(struct mlx5e_priv * priv,int trap_id,bool enable)301 static int mlx5e_apply_trap(struct mlx5e_priv *priv, int trap_id, bool enable)
302 {
303 enum devlink_trap_action action;
304 int err;
305
306 err = mlx5_devlink_traps_get_action(priv->mdev, trap_id, &action);
307 if (err)
308 return err;
309 if (action == DEVLINK_TRAP_ACTION_TRAP)
310 err = enable ? mlx5e_handle_action_trap(priv, trap_id) :
311 mlx5e_handle_action_drop(priv, trap_id);
312 return err;
313 }
314
315 static const int mlx5e_traps_arr[] = {
316 DEVLINK_TRAP_GENERIC_ID_INGRESS_VLAN_FILTER,
317 DEVLINK_TRAP_GENERIC_ID_DMAC_FILTER,
318 };
319
mlx5e_apply_traps(struct mlx5e_priv * priv,bool enable)320 int mlx5e_apply_traps(struct mlx5e_priv *priv, bool enable)
321 {
322 int err;
323 int i;
324
325 for (i = 0; i < ARRAY_SIZE(mlx5e_traps_arr); i++) {
326 err = mlx5e_apply_trap(priv, mlx5e_traps_arr[i], enable);
327 if (err)
328 return err;
329 }
330 return 0;
331 }
332