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
15static struct nfp_flower_cmsg_hdr *
16nfp_flower_cmsg_get_hdr(struct sk_buff *skb)
17{
18	return (struct nfp_flower_cmsg_hdr *)skb->data;
19}
20
21struct sk_buff *
22nfp_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
43struct sk_buff *
44nfp_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
61void
62nfp_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
75int 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
101int 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
122static bool
123nfp_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
150static void
151nfp_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
185static void
186nfp_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
207static void
208nfp_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
247err_rtnl_unlock:
248	rtnl_unlock();
249}
250
251static void
252nfp_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_en_feats & NFP_FL_ENABLE_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_v4(app, skb);
274		break;
275	case NFP_FLOWER_CMSG_TYPE_NO_NEIGH_V6:
276		nfp_tunnel_request_route_v6(app, skb);
277		break;
278	case NFP_FLOWER_CMSG_TYPE_ACTIVE_TUNS:
279		nfp_tunnel_keep_alive(app, skb);
280		break;
281	case NFP_FLOWER_CMSG_TYPE_ACTIVE_TUNS_V6:
282		nfp_tunnel_keep_alive_v6(app, skb);
283		break;
284	case NFP_FLOWER_CMSG_TYPE_QOS_STATS:
285		nfp_flower_stats_rlim_reply(app, skb);
286		break;
287	case NFP_FLOWER_CMSG_TYPE_LAG_CONFIG:
288		if (app_priv->flower_en_feats & NFP_FL_ENABLE_LAG) {
289			skb_stored = nfp_flower_lag_unprocessed_msg(app, skb);
290			break;
291		}
292		fallthrough;
293	default:
294err_default:
295		nfp_flower_cmsg_warn(app, "Cannot handle invalid repr control type %u\n",
296				     type);
297		goto out;
298	}
299
300	if (!skb_stored)
301		dev_consume_skb_any(skb);
302	return;
303out:
304	dev_kfree_skb_any(skb);
305}
306
307void nfp_flower_cmsg_process_rx(struct work_struct *work)
308{
309	struct sk_buff_head cmsg_joined;
310	struct nfp_flower_priv *priv;
311	struct sk_buff *skb;
312
313	priv = container_of(work, struct nfp_flower_priv, cmsg_work);
314	skb_queue_head_init(&cmsg_joined);
315
316	spin_lock_bh(&priv->cmsg_skbs_high.lock);
317	skb_queue_splice_tail_init(&priv->cmsg_skbs_high, &cmsg_joined);
318	spin_unlock_bh(&priv->cmsg_skbs_high.lock);
319
320	spin_lock_bh(&priv->cmsg_skbs_low.lock);
321	skb_queue_splice_tail_init(&priv->cmsg_skbs_low, &cmsg_joined);
322	spin_unlock_bh(&priv->cmsg_skbs_low.lock);
323
324	while ((skb = __skb_dequeue(&cmsg_joined)))
325		nfp_flower_cmsg_process_one_rx(priv->app, skb);
326}
327
328static void
329nfp_flower_queue_ctl_msg(struct nfp_app *app, struct sk_buff *skb, int type)
330{
331	struct nfp_flower_priv *priv = app->priv;
332	struct sk_buff_head *skb_head;
333
334	if (type == NFP_FLOWER_CMSG_TYPE_PORT_MOD)
335		skb_head = &priv->cmsg_skbs_high;
336	else
337		skb_head = &priv->cmsg_skbs_low;
338
339	if (skb_queue_len(skb_head) >= NFP_FLOWER_WORKQ_MAX_SKBS) {
340		nfp_flower_cmsg_warn(app, "Dropping queued control messages\n");
341		dev_kfree_skb_any(skb);
342		return;
343	}
344
345	skb_queue_tail(skb_head, skb);
346	schedule_work(&priv->cmsg_work);
347}
348
349void nfp_flower_cmsg_rx(struct nfp_app *app, struct sk_buff *skb)
350{
351	struct nfp_flower_cmsg_hdr *cmsg_hdr;
352
353	cmsg_hdr = nfp_flower_cmsg_get_hdr(skb);
354
355	if (unlikely(cmsg_hdr->version != NFP_FLOWER_CMSG_VER1)) {
356		nfp_flower_cmsg_warn(app, "Cannot handle repr control version %u\n",
357				     cmsg_hdr->version);
358		dev_kfree_skb_any(skb);
359		return;
360	}
361
362	if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_FLOW_STATS) {
363		/* We need to deal with stats updates from HW asap */
364		nfp_flower_rx_flow_stats(app, skb);
365		dev_consume_skb_any(skb);
366	} else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_MOD &&
367		   nfp_flower_process_mtu_ack(app, skb)) {
368		/* Handle MTU acks outside wq to prevent RTNL conflict. */
369		dev_consume_skb_any(skb);
370	} else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_TUN_NEIGH ||
371		   cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_TUN_NEIGH_V6) {
372		/* Acks from the NFP that the route is added - ignore. */
373		dev_consume_skb_any(skb);
374	} else if (cmsg_hdr->type == NFP_FLOWER_CMSG_TYPE_PORT_REIFY) {
375		/* Handle REIFY acks outside wq to prevent RTNL conflict. */
376		nfp_flower_cmsg_portreify_rx(app, skb);
377		dev_consume_skb_any(skb);
378	} else {
379		nfp_flower_queue_ctl_msg(app, skb, cmsg_hdr->type);
380	}
381}
382