1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2015-2018 Netronome Systems, Inc. */
3
4 #include <linux/bitfield.h>
5 #include <linux/netdevice.h>
6 #include <linux/skbuff.h>
7 #include <linux/workqueue.h>
8 #include <net/dst_metadata.h>
9
10 #include "main.h"
11 #include "../nfp_net.h"
12 #include "../nfp_net_repr.h"
13 #include "./cmsg.h"
14
15 static struct nfp_flower_cmsg_hdr *
nfp_flower_cmsg_get_hdr(struct sk_buff * skb)16 nfp_flower_cmsg_get_hdr(struct sk_buff *skb)
17 {
18 return (struct nfp_flower_cmsg_hdr *)skb->data;
19 }
20
21 struct sk_buff *
nfp_flower_cmsg_alloc(struct nfp_app * app,unsigned int size,enum nfp_flower_cmsg_type_port type,gfp_t flag)22 nfp_flower_cmsg_alloc(struct nfp_app *app, unsigned int size,
23 enum nfp_flower_cmsg_type_port type, gfp_t flag)
24 {
25 struct nfp_flower_cmsg_hdr *ch;
26 struct sk_buff *skb;
27
28 size += NFP_FLOWER_CMSG_HLEN;
29
30 skb = nfp_app_ctrl_msg_alloc(app, size, flag);
31 if (!skb)
32 return NULL;
33
34 ch = nfp_flower_cmsg_get_hdr(skb);
35 ch->pad = 0;
36 ch->version = NFP_FLOWER_CMSG_VER1;
37 ch->type = type;
38 skb_put(skb, size);
39
40 return skb;
41 }
42
43 struct sk_buff *
nfp_flower_cmsg_mac_repr_start(struct nfp_app * app,unsigned int num_ports)44 nfp_flower_cmsg_mac_repr_start(struct nfp_app *app, unsigned int num_ports)
45 {
46 struct nfp_flower_cmsg_mac_repr *msg;
47 struct sk_buff *skb;
48
49 skb = nfp_flower_cmsg_alloc(app, struct_size(msg, ports, num_ports),
50 NFP_FLOWER_CMSG_TYPE_MAC_REPR, GFP_KERNEL);
51 if (!skb)
52 return NULL;
53
54 msg = nfp_flower_cmsg_get_data(skb);
55 memset(msg->reserved, 0, sizeof(msg->reserved));
56 msg->num_ports = num_ports;
57
58 return skb;
59 }
60
61 void
nfp_flower_cmsg_mac_repr_add(struct sk_buff * skb,unsigned int idx,unsigned int nbi,unsigned int nbi_port,unsigned int phys_port)62 nfp_flower_cmsg_mac_repr_add(struct sk_buff *skb, unsigned int idx,
63 unsigned int nbi, unsigned int nbi_port,
64 unsigned int phys_port)
65 {
66 struct nfp_flower_cmsg_mac_repr *msg;
67
68 msg = nfp_flower_cmsg_get_data(skb);
69 msg->ports[idx].idx = idx;
70 msg->ports[idx].info = nbi & NFP_FLOWER_CMSG_MAC_REPR_NBI;
71 msg->ports[idx].nbi_port = nbi_port;
72 msg->ports[idx].phys_port = phys_port;
73 }
74
nfp_flower_cmsg_portmod(struct nfp_repr * repr,bool carrier_ok,unsigned int mtu,bool mtu_only)75 int nfp_flower_cmsg_portmod(struct nfp_repr *repr, bool carrier_ok,
76 unsigned int mtu, bool mtu_only)
77 {
78 struct nfp_flower_cmsg_portmod *msg;
79 struct sk_buff *skb;
80
81 skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg),
82 NFP_FLOWER_CMSG_TYPE_PORT_MOD, GFP_KERNEL);
83 if (!skb)
84 return -ENOMEM;
85
86 msg = nfp_flower_cmsg_get_data(skb);
87 msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id);
88 msg->reserved = 0;
89 msg->info = carrier_ok;
90
91 if (mtu_only)
92 msg->info |= NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY;
93
94 msg->mtu = cpu_to_be16(mtu);
95
96 nfp_ctrl_tx(repr->app->ctrl, skb);
97
98 return 0;
99 }
100
nfp_flower_cmsg_portreify(struct nfp_repr * repr,bool exists)101 int nfp_flower_cmsg_portreify(struct nfp_repr *repr, bool exists)
102 {
103 struct nfp_flower_cmsg_portreify *msg;
104 struct sk_buff *skb;
105
106 skb = nfp_flower_cmsg_alloc(repr->app, sizeof(*msg),
107 NFP_FLOWER_CMSG_TYPE_PORT_REIFY,
108 GFP_KERNEL);
109 if (!skb)
110 return -ENOMEM;
111
112 msg = nfp_flower_cmsg_get_data(skb);
113 msg->portnum = cpu_to_be32(repr->dst->u.port_info.port_id);
114 msg->reserved = 0;
115 msg->info = cpu_to_be16(exists);
116
117 nfp_ctrl_tx(repr->app->ctrl, skb);
118
119 return 0;
120 }
121
122 static bool
nfp_flower_process_mtu_ack(struct nfp_app * app,struct sk_buff * skb)123 nfp_flower_process_mtu_ack(struct nfp_app *app, struct sk_buff *skb)
124 {
125 struct nfp_flower_priv *app_priv = app->priv;
126 struct nfp_flower_cmsg_portmod *msg;
127
128 msg = nfp_flower_cmsg_get_data(skb);
129
130 if (!(msg->info & NFP_FLOWER_CMSG_PORTMOD_MTU_CHANGE_ONLY))
131 return false;
132
133 spin_lock_bh(&app_priv->mtu_conf.lock);
134 if (!app_priv->mtu_conf.requested_val ||
135 app_priv->mtu_conf.portnum != be32_to_cpu(msg->portnum) ||
136 be16_to_cpu(msg->mtu) != app_priv->mtu_conf.requested_val) {
137 /* Not an ack for requested MTU change. */
138 spin_unlock_bh(&app_priv->mtu_conf.lock);
139 return false;
140 }
141
142 app_priv->mtu_conf.ack = true;
143 app_priv->mtu_conf.requested_val = 0;
144 wake_up(&app_priv->mtu_conf.wait_q);
145 spin_unlock_bh(&app_priv->mtu_conf.lock);
146
147 return true;
148 }
149
150 static void
nfp_flower_cmsg_portmod_rx(struct nfp_app * app,struct sk_buff * skb)151 nfp_flower_cmsg_portmod_rx(struct nfp_app *app, struct sk_buff *skb)
152 {
153 struct nfp_flower_cmsg_portmod *msg;
154 struct net_device *netdev;
155 bool link;
156
157 msg = nfp_flower_cmsg_get_data(skb);
158 link = msg->info & NFP_FLOWER_CMSG_PORTMOD_INFO_LINK;
159
160 rtnl_lock();
161 rcu_read_lock();
162 netdev = nfp_app_dev_get(app, be32_to_cpu(msg->portnum), NULL);
163 rcu_read_unlock();
164 if (!netdev) {
165 nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n",
166 be32_to_cpu(msg->portnum));
167 rtnl_unlock();
168 return;
169 }
170
171 if (link) {
172 u16 mtu = be16_to_cpu(msg->mtu);
173
174 netif_carrier_on(netdev);
175
176 /* An MTU of 0 from the firmware should be ignored */
177 if (mtu)
178 dev_set_mtu(netdev, mtu);
179 } else {
180 netif_carrier_off(netdev);
181 }
182 rtnl_unlock();
183 }
184
185 static void
nfp_flower_cmsg_portreify_rx(struct nfp_app * app,struct sk_buff * skb)186 nfp_flower_cmsg_portreify_rx(struct nfp_app *app, struct sk_buff *skb)
187 {
188 struct nfp_flower_priv *priv = app->priv;
189 struct nfp_flower_cmsg_portreify *msg;
190 bool exists;
191
192 msg = nfp_flower_cmsg_get_data(skb);
193
194 rcu_read_lock();
195 exists = !!nfp_app_dev_get(app, be32_to_cpu(msg->portnum), NULL);
196 rcu_read_unlock();
197 if (!exists) {
198 nfp_flower_cmsg_warn(app, "ctrl msg for unknown port 0x%08x\n",
199 be32_to_cpu(msg->portnum));
200 return;
201 }
202
203 atomic_inc(&priv->reify_replies);
204 wake_up(&priv->reify_wait_queue);
205 }
206
207 static void
nfp_flower_cmsg_merge_hint_rx(struct nfp_app * app,struct sk_buff * skb)208 nfp_flower_cmsg_merge_hint_rx(struct nfp_app *app, struct sk_buff *skb)
209 {
210 unsigned int msg_len = nfp_flower_cmsg_get_data_len(skb);
211 struct nfp_flower_cmsg_merge_hint *msg;
212 struct nfp_fl_payload *sub_flows[2];
213 int err, i, flow_cnt;
214
215 msg = nfp_flower_cmsg_get_data(skb);
216 /* msg->count starts at 0 and always assumes at least 1 entry. */
217 flow_cnt = msg->count + 1;
218
219 if (msg_len < struct_size(msg, flow, flow_cnt)) {
220 nfp_flower_cmsg_warn(app, "Merge hint ctrl msg too short - %d bytes but expect %zd\n",
221 msg_len, struct_size(msg, flow, flow_cnt));
222 return;
223 }
224
225 if (flow_cnt != 2) {
226 nfp_flower_cmsg_warn(app, "Merge hint contains %d flows - two are expected\n",
227 flow_cnt);
228 return;
229 }
230
231 rtnl_lock();
232 for (i = 0; i < flow_cnt; i++) {
233 u32 ctx = be32_to_cpu(msg->flow[i].host_ctx);
234
235 sub_flows[i] = nfp_flower_get_fl_payload_from_ctx(app, ctx);
236 if (!sub_flows[i]) {
237 nfp_flower_cmsg_warn(app, "Invalid flow in merge hint\n");
238 goto err_rtnl_unlock;
239 }
240 }
241
242 err = nfp_flower_merge_offloaded_flows(app, sub_flows[0], sub_flows[1]);
243 /* Only warn on memory fail. Hint veto will not break functionality. */
244 if (err == -ENOMEM)
245 nfp_flower_cmsg_warn(app, "Flow merge memory fail.\n");
246
247 err_rtnl_unlock:
248 rtnl_unlock();
249 }
250
251 static void
nfp_flower_cmsg_process_one_rx(struct nfp_app * app,struct sk_buff * skb)252 nfp_flower_cmsg_process_one_rx(struct nfp_app *app, struct sk_buff *skb)
253 {
254 struct nfp_flower_priv *app_priv = app->priv;
255 struct nfp_flower_cmsg_hdr *cmsg_hdr;
256 enum nfp_flower_cmsg_type_port type;
257 bool skb_stored = false;
258
259 cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
260
261 type = cmsg_hdr->type;
262 switch (type) {
263 case NFP_FLOWER_CMSG_TYPE_PORT_MOD:
264 nfp_flower_cmsg_portmod_rx(app, skb);
265 break;
266 case NFP_FLOWER_CMSG_TYPE_MERGE_HINT:
267 if (app_priv->flower_ext_feats & NFP_FL_FEATS_FLOW_MERGE) {
268 nfp_flower_cmsg_merge_hint_rx(app, skb);
269 break;
270 }
271 goto err_default;
272 case NFP_FLOWER_CMSG_TYPE_NO_NEIGH:
273 nfp_tunnel_request_route(app, skb);
274 break;
275 case NFP_FLOWER_CMSG_TYPE_ACTIVE_TUNS:
276 nfp_tunnel_keep_alive(app, skb);
277 break;
278 case NFP_FLOWER_CMSG_TYPE_QOS_STATS:
279 nfp_flower_stats_rlim_reply(app, skb);
280 break;
281 case NFP_FLOWER_CMSG_TYPE_LAG_CONFIG:
282 if (app_priv->flower_ext_feats & NFP_FL_FEATS_LAG) {
283 skb_stored = nfp_flower_lag_unprocessed_msg(app, skb);
284 break;
285 }
286 /* fall through */
287 default:
288 err_default:
289 nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n",
290 type);
291 goto out;
292 }
293
294 if (!skb_stored)
295 dev_consume_skb_any(skb);
296 return;
297 out:
298 dev_kfree_skb_any(skb);
299 }
300
nfp_flower_cmsg_process_rx(struct work_struct * work)301 void nfp_flower_cmsg_process_rx(struct work_struct *work)
302 {
303 struct sk_buff_head cmsg_joined;
304 struct nfp_flower_priv *priv;
305 struct sk_buff *skb;
306
307 priv = container_of(work, struct nfp_flower_priv, cmsg_work);
308 skb_queue_head_init(&cmsg_joined);
309
310 spin_lock_bh(&priv->cmsg_skbs_high.lock);
311 skb_queue_splice_tail_init(&priv->cmsg_skbs_high, &cmsg_joined);
312 spin_unlock_bh(&priv->cmsg_skbs_high.lock);
313
314 spin_lock_bh(&priv->cmsg_skbs_low.lock);
315 skb_queue_splice_tail_init(&priv->cmsg_skbs_low, &cmsg_joined);
316 spin_unlock_bh(&priv->cmsg_skbs_low.lock);
317
318 while ((skb = __skb_dequeue(&cmsg_joined)))
319 nfp_flower_cmsg_process_one_rx(priv->app, skb);
320 }
321
322 static void
nfp_flower_queue_ctl_msg(struct nfp_app * app,struct sk_buff * skb,int type)323 nfp_flower_queue_ctl_msg(struct nfp_app *app, struct sk_buff *skb, int type)
324 {
325 struct nfp_flower_priv *priv = app->priv;
326 struct sk_buff_head *skb_head;
327
328 if (type == NFP_FLOWER_CMSG_TYPE_PORT_MOD)
329 skb_head = &priv->cmsg_skbs_high;
330 else
331 skb_head = &priv->cmsg_skbs_low;
332
333 if (skb_queue_len(skb_head) >= NFP_FLOWER_WORKQ_MAX_SKBS) {
334 nfp_flower_cmsg_warn(app, "Dropping queued control messages\n");
335 dev_kfree_skb_any(skb);
336 return;
337 }
338
339 skb_queue_tail(skb_head, skb);
340 schedule_work(&priv->cmsg_work);
341 }
342
nfp_flower_cmsg_rx(struct nfp_app * app,struct sk_buff * skb)343 void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
344 {
345 struct nfp_flower_cmsg_hdr *cmsg_hdr;
346
347 cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
348
349 if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) {
350 nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n",
351 cmsg_hdr->version);
352 dev_kfree_skb_any(skb);
353 return;
354 }
355
356 if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_FLOW_STATS) {
357 /* We need to deal with stats updates from HW asap */
358 nfp_flower_rx_flow_stats(app, skb);
359 dev_consume_skb_any(skb);
360 } else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_MOD &&
361 nfp_flower_process_mtu_ack(app, skb)) {
362 /* Handle MTU acks outside wq to prevent RTNL conflict. */
363 dev_consume_skb_any(skb);
364 } else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_TUN_NEIGH) {
365 /* Acks from the NFP that the route is added - ignore. */
366 dev_consume_skb_any(skb);
367 } else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_REIFY) {
368 /* Handle REIFY acks outside wq to prevent RTNL conflict. */
369 nfp_flower_cmsg_portreify_rx(app, skb);
370 dev_consume_skb_any(skb);
371 } else {
372 nfp_flower_queue_ctl_msg(app, skb, cmsg_hdr->type);
373 }
374 }
375
