xref: /freebsd/sys/dev/cxgbe/tom/t4_connect.c (revision ec0ea6efa1ad229d75c394c1a9b9cac33af2b1d3)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2012 Chelsio Communications, Inc.
5  * All rights reserved.
6  * Written by: Navdeep Parhar <np@FreeBSD.org>
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32 
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35 
36 #ifdef TCP_OFFLOAD
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/ktr.h>
41 #include <sys/module.h>
42 #include <sys/protosw.h>
43 #include <sys/domain.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
46 #include <sys/sysctl.h>
47 #include <net/ethernet.h>
48 #include <net/if.h>
49 #include <net/if_types.h>
50 #include <net/if_vlan_var.h>
51 #include <net/route.h>
52 #include <net/route/nhop.h>
53 #include <netinet/in.h>
54 #include <netinet/in_pcb.h>
55 #include <netinet/ip.h>
56 #define TCPSTATES
57 #include <netinet/tcp_fsm.h>
58 #include <netinet/tcp_var.h>
59 #include <netinet/toecore.h>
60 #include <netinet/cc/cc.h>
61 
62 #include "common/common.h"
63 #include "common/t4_msg.h"
64 #include "common/t4_regs.h"
65 #include "common/t4_regs_values.h"
66 #include "t4_clip.h"
67 #include "tom/t4_tom_l2t.h"
68 #include "tom/t4_tom.h"
69 
70 /*
71  * Active open succeeded.
72  */
73 static int
74 do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
75     struct mbuf *m)
76 {
77 	struct adapter *sc = iq->adapter;
78 	const struct cpl_act_establish *cpl = (const void *)(rss + 1);
79 	u_int tid = GET_TID(cpl);
80 	u_int atid = G_TID_TID(ntohl(cpl->tos_atid));
81 	struct toepcb *toep = lookup_atid(sc, atid);
82 	struct inpcb *inp = toep->inp;
83 
84 	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
85 	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
86 
87 	CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid);
88 	free_atid(sc, atid);
89 
90 	CURVNET_SET(toep->vnet);
91 	INP_WLOCK(inp);
92 	toep->tid = tid;
93 	insert_tid(sc, tid, toep, inp->inp_vflag & INP_IPV6 ? 2 : 1);
94 	if (inp->inp_flags & INP_DROPPED) {
95 
96 		/* socket closed by the kernel before hw told us it connected */
97 
98 		send_flowc_wr(toep, NULL);
99 		send_reset(sc, toep, be32toh(cpl->snd_isn));
100 		goto done;
101 	}
102 
103 	make_established(toep, be32toh(cpl->snd_isn) - 1,
104 	    be32toh(cpl->rcv_isn) - 1, cpl->tcp_opt);
105 	inp->inp_flowtype = M_HASHTYPE_OPAQUE;
106 	inp->inp_flowid = tid;
107 
108 done:
109 	INP_WUNLOCK(inp);
110 	CURVNET_RESTORE();
111 	return (0);
112 }
113 
114 void
115 act_open_failure_cleanup(struct adapter *sc, u_int atid, u_int status)
116 {
117 	struct toepcb *toep = lookup_atid(sc, atid);
118 	struct inpcb *inp = toep->inp;
119 	struct toedev *tod = &toep->td->tod;
120 	struct epoch_tracker et;
121 
122 	free_atid(sc, atid);
123 	toep->tid = -1;
124 
125 	CURVNET_SET(toep->vnet);
126 	if (status != EAGAIN)
127 		NET_EPOCH_ENTER(et);
128 	INP_WLOCK(inp);
129 	toe_connect_failed(tod, inp, status);
130 	final_cpl_received(toep);	/* unlocks inp */
131 	if (status != EAGAIN)
132 		NET_EPOCH_EXIT(et);
133 	CURVNET_RESTORE();
134 }
135 
136 /*
137  * Active open failed.
138  */
139 static int
140 do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
141     struct mbuf *m)
142 {
143 	struct adapter *sc = iq->adapter;
144 	const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
145 	u_int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
146 	u_int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
147 	struct toepcb *toep = lookup_atid(sc, atid);
148 	int rc;
149 
150 	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
151 	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
152 
153 	CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
154 
155 	/* Ignore negative advice */
156 	if (negative_advice(status))
157 		return (0);
158 
159 	if (status && act_open_has_tid(status))
160 		release_tid(sc, GET_TID(cpl), toep->ctrlq);
161 
162 	rc = act_open_rpl_status_to_errno(status);
163 	act_open_failure_cleanup(sc, atid, rc);
164 
165 	return (0);
166 }
167 
168 void
169 t4_init_connect_cpl_handlers(void)
170 {
171 
172 	t4_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
173 	t4_register_shared_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl,
174 	    CPL_COOKIE_TOM);
175 }
176 
177 void
178 t4_uninit_connect_cpl_handlers(void)
179 {
180 
181 	t4_register_cpl_handler(CPL_ACT_ESTABLISH, NULL);
182 	t4_register_shared_cpl_handler(CPL_ACT_OPEN_RPL, NULL, CPL_COOKIE_TOM);
183 }
184 
185 #define DONT_OFFLOAD_ACTIVE_OPEN(x)	do { \
186 	reason = __LINE__; \
187 	rc = (x); \
188 	goto failed; \
189 } while (0)
190 
191 static inline int
192 act_open_cpl_size(struct adapter *sc, int isipv6)
193 {
194 	int idx;
195 	static const int sz_table[3][2] = {
196 		{
197 			sizeof (struct cpl_act_open_req),
198 			sizeof (struct cpl_act_open_req6)
199 		},
200 		{
201 			sizeof (struct cpl_t5_act_open_req),
202 			sizeof (struct cpl_t5_act_open_req6)
203 		},
204 		{
205 			sizeof (struct cpl_t6_act_open_req),
206 			sizeof (struct cpl_t6_act_open_req6)
207 		},
208 	};
209 
210 	MPASS(chip_id(sc) >= CHELSIO_T4);
211 	idx = min(chip_id(sc) - CHELSIO_T4, 2);
212 
213 	return (sz_table[idx][!!isipv6]);
214 }
215 
216 /*
217  * active open (soconnect).
218  *
219  * State of affairs on entry:
220  * soisconnecting (so_state |= SS_ISCONNECTING)
221  * tcbinfo not locked (This has changed - used to be WLOCKed)
222  * inp WLOCKed
223  * tp->t_state = TCPS_SYN_SENT
224  * rtalloc1, RT_UNLOCK on rt.
225  */
226 int
227 t4_connect(struct toedev *tod, struct socket *so, struct nhop_object *nh,
228     struct sockaddr *nam)
229 {
230 	struct adapter *sc = tod->tod_softc;
231 	struct toepcb *toep = NULL;
232 	struct wrqe *wr = NULL;
233 	struct ifnet *rt_ifp = nh->nh_ifp;
234 	struct vi_info *vi;
235 	int qid_atid, rc, isipv6;
236 	struct inpcb *inp = sotoinpcb(so);
237 	struct tcpcb *tp = intotcpcb(inp);
238 	int reason;
239 	struct offload_settings settings;
240 	struct epoch_tracker et;
241 	uint16_t vid = 0xfff, pcp = 0;
242 
243 	INP_WLOCK_ASSERT(inp);
244 	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
245 	    ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family));
246 
247 	if (rt_ifp->if_type == IFT_ETHER)
248 		vi = rt_ifp->if_softc;
249 	else if (rt_ifp->if_type == IFT_L2VLAN) {
250 		struct ifnet *ifp = VLAN_TRUNKDEV(rt_ifp);
251 
252 		vi = ifp->if_softc;
253 		VLAN_TAG(rt_ifp, &vid);
254 		VLAN_PCP(rt_ifp, &pcp);
255 	} else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
256 		DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */
257 	else
258 		DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
259 	if (sc->flags & KERN_TLS_ON)
260 		DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
261 
262 	rw_rlock(&sc->policy_lock);
263 	settings = *lookup_offload_policy(sc, OPEN_TYPE_ACTIVE, NULL,
264 	    EVL_MAKETAG(vid, pcp, 0), inp);
265 	rw_runlock(&sc->policy_lock);
266 	if (!settings.offload)
267 		DONT_OFFLOAD_ACTIVE_OPEN(EPERM);
268 
269 	toep = alloc_toepcb(vi, M_NOWAIT);
270 	if (toep == NULL)
271 		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
272 
273 	toep->tid = alloc_atid(sc, toep);
274 	if (toep->tid < 0)
275 		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
276 
277 	toep->l2te = t4_l2t_get(vi->pi, rt_ifp,
278 	    nh->nh_flags & NHF_GATEWAY ? &nh->gw_sa : nam);
279 	if (toep->l2te == NULL)
280 		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
281 
282 	toep->vnet = so->so_vnet;
283 	init_conn_params(vi, &settings, &inp->inp_inc, so, NULL,
284 	    toep->l2te->idx, &toep->params);
285 	init_toepcb(vi, toep);
286 
287 	isipv6 = nam->sa_family == AF_INET6;
288 	wr = alloc_wrqe(act_open_cpl_size(sc, isipv6), toep->ctrlq);
289 	if (wr == NULL)
290 		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
291 
292 	qid_atid = V_TID_QID(toep->ofld_rxq->iq.abs_id) | V_TID_TID(toep->tid) |
293 	    V_TID_COOKIE(CPL_COOKIE_TOM);
294 
295 	if (isipv6) {
296 		struct cpl_act_open_req6 *cpl = wrtod(wr);
297 		struct cpl_t5_act_open_req6 *cpl5 = (void *)cpl;
298 		struct cpl_t6_act_open_req6 *cpl6 = (void *)cpl;
299 
300 		if ((inp->inp_vflag & INP_IPV6) == 0)
301 			DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
302 
303 		toep->ce = t4_get_clip_entry(sc, &inp->in6p_laddr, true);
304 		if (toep->ce == NULL)
305 			DONT_OFFLOAD_ACTIVE_OPEN(ENOENT);
306 
307 		switch (chip_id(sc)) {
308 		case CHELSIO_T4:
309 			INIT_TP_WR(cpl, 0);
310 			cpl->params = select_ntuple(vi, toep->l2te);
311 			break;
312 		case CHELSIO_T5:
313 			INIT_TP_WR(cpl5, 0);
314 			cpl5->iss = htobe32(tp->iss);
315 			cpl5->params = select_ntuple(vi, toep->l2te);
316 			break;
317 		case CHELSIO_T6:
318 		default:
319 			INIT_TP_WR(cpl6, 0);
320 			cpl6->iss = htobe32(tp->iss);
321 			cpl6->params = select_ntuple(vi, toep->l2te);
322 			break;
323 		}
324 		OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
325 		    qid_atid));
326 		cpl->local_port = inp->inp_lport;
327 		cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0];
328 		cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8];
329 		cpl->peer_port = inp->inp_fport;
330 		cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0];
331 		cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8];
332 		cpl->opt0 = calc_options0(vi, &toep->params);
333 		cpl->opt2 = calc_options2(vi, &toep->params);
334 
335 		CTR6(KTR_CXGBE,
336 		    "%s: atid %u, toep %p, inp %p, opt0 %#016lx, opt2 %#08x",
337 		    __func__, toep->tid, toep, inp, be64toh(cpl->opt0),
338 		    be32toh(cpl->opt2));
339 	} else {
340 		struct cpl_act_open_req *cpl = wrtod(wr);
341 		struct cpl_t5_act_open_req *cpl5 = (void *)cpl;
342 		struct cpl_t6_act_open_req *cpl6 = (void *)cpl;
343 
344 		switch (chip_id(sc)) {
345 		case CHELSIO_T4:
346 			INIT_TP_WR(cpl, 0);
347 			cpl->params = select_ntuple(vi, toep->l2te);
348 			break;
349 		case CHELSIO_T5:
350 			INIT_TP_WR(cpl5, 0);
351 			cpl5->iss = htobe32(tp->iss);
352 			cpl5->params = select_ntuple(vi, toep->l2te);
353 			break;
354 		case CHELSIO_T6:
355 		default:
356 			INIT_TP_WR(cpl6, 0);
357 			cpl6->iss = htobe32(tp->iss);
358 			cpl6->params = select_ntuple(vi, toep->l2te);
359 			break;
360 		}
361 		OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
362 		    qid_atid));
363 		inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port,
364 		    &cpl->peer_ip, &cpl->peer_port);
365 		cpl->opt0 = calc_options0(vi, &toep->params);
366 		cpl->opt2 = calc_options2(vi, &toep->params);
367 
368 		CTR6(KTR_CXGBE,
369 		    "%s: atid %u, toep %p, inp %p, opt0 %#016lx, opt2 %#08x",
370 		    __func__, toep->tid, toep, inp, be64toh(cpl->opt0),
371 		    be32toh(cpl->opt2));
372 	}
373 
374 	offload_socket(so, toep);
375 	NET_EPOCH_ENTER(et);
376 	rc = t4_l2t_send(sc, wr, toep->l2te);
377 	NET_EPOCH_EXIT(et);
378 	if (rc == 0) {
379 		toep->flags |= TPF_CPL_PENDING;
380 		return (0);
381 	}
382 
383 	undo_offload_socket(so);
384 	reason = __LINE__;
385 failed:
386 	CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc);
387 
388 	if (wr)
389 		free_wrqe(wr);
390 
391 	if (toep) {
392 		if (toep->tid >= 0)
393 			free_atid(sc, toep->tid);
394 		if (toep->l2te)
395 			t4_l2t_release(toep->l2te);
396 		if (toep->ce)
397 			t4_release_clip_entry(sc, toep->ce);
398 		free_toepcb(toep);
399 	}
400 
401 	return (rc);
402 }
403 #endif
404