1/*-
2 * Copyright (c) 2012 Chelsio Communications, Inc.
3 * All rights reserved.
4 * Written by: Navdeep Parhar <np@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/sys/dev/cxgbe/tom/t4_connect.c 318804 2017-05-24 20:01:12Z np $");
30
31#include "opt_inet.h"
32#include "opt_inet6.h"
33
34#ifdef TCP_OFFLOAD
35#include <sys/param.h>
36#include <sys/types.h>
37#include <sys/kernel.h>
38#include <sys/ktr.h>
39#include <sys/module.h>
40#include <sys/protosw.h>
41#include <sys/domain.h>
42#include <sys/socket.h>
43#include <sys/socketvar.h>
44#include <net/ethernet.h>
45#include <net/if.h>
46#include <net/if_types.h>
47#include <net/if_vlan_var.h>
48#include <net/route.h>
49#include <netinet/in.h>
50#include <netinet/in_pcb.h>
51#include <netinet/ip.h>
52#include <netinet/tcp_var.h>
53#define TCPSTATES
54#include <netinet/tcp_fsm.h>
55#include <netinet/toecore.h>
56
57#include "common/common.h"
58#include "common/t4_msg.h"
59#include "common/t4_regs.h"
60#include "common/t4_regs_values.h"
61#include "tom/t4_tom_l2t.h"
62#include "tom/t4_tom.h"
63
64/* atid services */
65static int alloc_atid(struct adapter *, void *);
66static void *lookup_atid(struct adapter *, int);
67static void free_atid(struct adapter *, int);
68
69static int
70alloc_atid(struct adapter *sc, void *ctx)
71{
72	struct tid_info *t = &sc->tids;
73	int atid = -1;
74
75	mtx_lock(&t->atid_lock);
76	if (t->afree) {
77		union aopen_entry *p = t->afree;
78
79		atid = p - t->atid_tab;
80		t->afree = p->next;
81		p->data = ctx;
82		t->atids_in_use++;
83	}
84	mtx_unlock(&t->atid_lock);
85	return (atid);
86}
87
88static void *
89lookup_atid(struct adapter *sc, int atid)
90{
91	struct tid_info *t = &sc->tids;
92
93	return (t->atid_tab[atid].data);
94}
95
96static void
97free_atid(struct adapter *sc, int atid)
98{
99	struct tid_info *t = &sc->tids;
100	union aopen_entry *p = &t->atid_tab[atid];
101
102	mtx_lock(&t->atid_lock);
103	p->next = t->afree;
104	t->afree = p;
105	t->atids_in_use--;
106	mtx_unlock(&t->atid_lock);
107}
108
109/*
110 * Active open succeeded.
111 */
112static int
113do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
114    struct mbuf *m)
115{
116	struct adapter *sc = iq->adapter;
117	const struct cpl_act_establish *cpl = (const void *)(rss + 1);
118	u_int tid = GET_TID(cpl);
119	u_int atid = G_TID_TID(ntohl(cpl->tos_atid));
120	struct toepcb *toep = lookup_atid(sc, atid);
121	struct inpcb *inp = toep->inp;
122
123	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
124	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
125
126	CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid);
127	free_atid(sc, atid);
128
129	CURVNET_SET(toep->vnet);
130	INP_WLOCK(inp);
131	toep->tid = tid;
132	insert_tid(sc, tid, toep, inp->inp_vflag & INP_IPV6 ? 2 : 1);
133	if (inp->inp_flags & INP_DROPPED) {
134
135		/* socket closed by the kernel before hw told us it connected */
136
137		send_flowc_wr(toep, NULL);
138		send_reset(sc, toep, be32toh(cpl->snd_isn));
139		goto done;
140	}
141
142	make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
143done:
144	INP_WUNLOCK(inp);
145	CURVNET_RESTORE();
146	return (0);
147}
148
149/*
150 * Convert an ACT_OPEN_RPL status to an errno.
151 */
152static inline int
153act_open_rpl_status_to_errno(int status)
154{
155
156	switch (status) {
157	case CPL_ERR_CONN_RESET:
158		return (ECONNREFUSED);
159	case CPL_ERR_ARP_MISS:
160		return (EHOSTUNREACH);
161	case CPL_ERR_CONN_TIMEDOUT:
162		return (ETIMEDOUT);
163	case CPL_ERR_TCAM_FULL:
164		return (EAGAIN);
165	case CPL_ERR_CONN_EXIST:
166		log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n");
167		return (EAGAIN);
168	default:
169		return (EIO);
170	}
171}
172
173void
174act_open_failure_cleanup(struct adapter *sc, u_int atid, u_int status)
175{
176	struct toepcb *toep = lookup_atid(sc, atid);
177	struct inpcb *inp = toep->inp;
178	struct toedev *tod = &toep->td->tod;
179
180	free_atid(sc, atid);
181	toep->tid = -1;
182
183	CURVNET_SET(toep->vnet);
184	if (status != EAGAIN)
185		INP_INFO_RLOCK(&V_tcbinfo);
186	INP_WLOCK(inp);
187	toe_connect_failed(tod, inp, status);
188	final_cpl_received(toep);	/* unlocks inp */
189	if (status != EAGAIN)
190		INP_INFO_RUNLOCK(&V_tcbinfo);
191	CURVNET_RESTORE();
192}
193
194/*
195 * Active open failed.
196 */
197static int
198do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
199    struct mbuf *m)
200{
201	struct adapter *sc = iq->adapter;
202	const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
203	u_int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
204	u_int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
205	struct toepcb *toep = lookup_atid(sc, atid);
206	int rc;
207
208	KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
209	KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
210
211	CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
212
213	/* Ignore negative advice */
214	if (negative_advice(status))
215		return (0);
216
217	if (status && act_open_has_tid(status))
218		release_tid(sc, GET_TID(cpl), toep->ctrlq);
219
220	rc = act_open_rpl_status_to_errno(status);
221	act_open_failure_cleanup(sc, atid, rc);
222
223	return (0);
224}
225
226/*
227 * Options2 for active open.
228 */
229static uint32_t
230calc_opt2a(struct socket *so, struct toepcb *toep)
231{
232	struct tcpcb *tp = so_sototcpcb(so);
233	struct port_info *pi = toep->vi->pi;
234	struct adapter *sc = pi->adapter;
235	uint32_t opt2;
236
237	opt2 = V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]) |
238	    F_RSS_QUEUE_VALID | V_RSS_QUEUE(toep->ofld_rxq->iq.abs_id);
239
240	if (tp->t_flags & TF_SACK_PERMIT)
241		opt2 |= F_SACK_EN;
242
243	if (tp->t_flags & TF_REQ_TSTMP)
244		opt2 |= F_TSTAMPS_EN;
245
246	if (tp->t_flags & TF_REQ_SCALE)
247		opt2 |= F_WND_SCALE_EN;
248
249	if (V_tcp_do_ecn)
250		opt2 |= F_CCTRL_ECN;
251
252	/* RX_COALESCE is always a valid value (M_RX_COALESCE). */
253	if (is_t4(sc))
254		opt2 |= F_RX_COALESCE_VALID;
255	else {
256		opt2 |= F_T5_OPT_2_VALID;
257		opt2 |= F_T5_ISS;
258	}
259	if (sc->tt.rx_coalesce)
260		opt2 |= V_RX_COALESCE(M_RX_COALESCE);
261
262#ifdef USE_DDP_RX_FLOW_CONTROL
263	if (toep->ulp_mode == ULP_MODE_TCPDDP)
264		opt2 |= F_RX_FC_VALID | F_RX_FC_DDP;
265#endif
266
267	return (htobe32(opt2));
268}
269
270void
271t4_init_connect_cpl_handlers(void)
272{
273
274	t4_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
275	t4_register_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl);
276}
277
278void
279t4_uninit_connect_cpl_handlers(void)
280{
281
282	t4_register_cpl_handler(CPL_ACT_ESTABLISH, NULL);
283	t4_register_cpl_handler(CPL_ACT_OPEN_RPL, NULL);
284}
285
286#define DONT_OFFLOAD_ACTIVE_OPEN(x)	do { \
287	reason = __LINE__; \
288	rc = (x); \
289	goto failed; \
290} while (0)
291
292static inline int
293act_open_cpl_size(struct adapter *sc, int isipv6)
294{
295	int idx;
296	static const int sz_table[3][2] = {
297		{
298			sizeof (struct cpl_act_open_req),
299			sizeof (struct cpl_act_open_req6)
300		},
301		{
302			sizeof (struct cpl_t5_act_open_req),
303			sizeof (struct cpl_t5_act_open_req6)
304		},
305		{
306			sizeof (struct cpl_t6_act_open_req),
307			sizeof (struct cpl_t6_act_open_req6)
308		},
309	};
310
311	MPASS(chip_id(sc) >= CHELSIO_T4);
312	idx = min(chip_id(sc) - CHELSIO_T4, 2);
313
314	return (sz_table[idx][!!isipv6]);
315}
316
317/*
318 * active open (soconnect).
319 *
320 * State of affairs on entry:
321 * soisconnecting (so_state |= SS_ISCONNECTING)
322 * tcbinfo not locked (This has changed - used to be WLOCKed)
323 * inp WLOCKed
324 * tp->t_state = TCPS_SYN_SENT
325 * rtalloc1, RT_UNLOCK on rt.
326 */
327int
328t4_connect(struct toedev *tod, struct socket *so, struct rtentry *rt,
329    struct sockaddr *nam)
330{
331	struct adapter *sc = tod->tod_softc;
332	struct tom_data *td = tod_td(tod);
333	struct toepcb *toep = NULL;
334	struct wrqe *wr = NULL;
335	struct ifnet *rt_ifp = rt->rt_ifp;
336	struct vi_info *vi;
337	int mtu_idx, rscale, qid_atid, rc, isipv6;
338	struct inpcb *inp = sotoinpcb(so);
339	struct tcpcb *tp = intotcpcb(inp);
340	int reason;
341
342	INP_WLOCK_ASSERT(inp);
343	KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
344	    ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family));
345
346	if (rt_ifp->if_type == IFT_ETHER)
347		vi = rt_ifp->if_softc;
348	else if (rt_ifp->if_type == IFT_L2VLAN) {
349		struct ifnet *ifp = VLAN_COOKIE(rt_ifp);
350
351		vi = ifp->if_softc;
352	} else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
353		DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */
354	else
355		DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
356
357	toep = alloc_toepcb(vi, -1, -1, M_NOWAIT | M_ZERO);
358	if (toep == NULL)
359		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
360
361	toep->tid = alloc_atid(sc, toep);
362	if (toep->tid < 0)
363		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
364
365	toep->l2te = t4_l2t_get(vi->pi, rt_ifp,
366	    rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam);
367	if (toep->l2te == NULL)
368		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
369
370	isipv6 = nam->sa_family == AF_INET6;
371	wr = alloc_wrqe(act_open_cpl_size(sc, isipv6), toep->ctrlq);
372	if (wr == NULL)
373		DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
374
375	toep->vnet = so->so_vnet;
376	if (sc->tt.ddp && (so->so_options & SO_NO_DDP) == 0)
377		set_tcpddp_ulp_mode(toep);
378	else
379		toep->ulp_mode = ULP_MODE_NONE;
380	SOCKBUF_LOCK(&so->so_rcv);
381	/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
382	toep->rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
383	SOCKBUF_UNLOCK(&so->so_rcv);
384
385	/*
386	 * The kernel sets request_r_scale based on sb_max whereas we need to
387	 * take hardware's MAX_RCV_WND into account too.  This is normally a
388	 * no-op as MAX_RCV_WND is much larger than the default sb_max.
389	 */
390	if (tp->t_flags & TF_REQ_SCALE)
391		rscale = tp->request_r_scale = select_rcv_wscale();
392	else
393		rscale = 0;
394	mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0);
395	qid_atid = (toep->ofld_rxq->iq.abs_id << 14) | toep->tid;
396
397	if (isipv6) {
398		struct cpl_act_open_req6 *cpl = wrtod(wr);
399		struct cpl_t5_act_open_req6 *cpl5 = (void *)cpl;
400		struct cpl_t6_act_open_req6 *cpl6 = (void *)cpl;
401
402		if ((inp->inp_vflag & INP_IPV6) == 0)
403			DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
404
405		toep->ce = hold_lip(td, &inp->in6p_laddr, NULL);
406		if (toep->ce == NULL)
407			DONT_OFFLOAD_ACTIVE_OPEN(ENOENT);
408
409		switch (chip_id(sc)) {
410		case CHELSIO_T4:
411			INIT_TP_WR(cpl, 0);
412			cpl->params = select_ntuple(vi, toep->l2te);
413			break;
414		case CHELSIO_T5:
415			INIT_TP_WR(cpl5, 0);
416			cpl5->iss = htobe32(tp->iss);
417			cpl5->params = select_ntuple(vi, toep->l2te);
418			break;
419		case CHELSIO_T6:
420		default:
421			INIT_TP_WR(cpl6, 0);
422			cpl6->iss = htobe32(tp->iss);
423			cpl6->params = select_ntuple(vi, toep->l2te);
424			break;
425		}
426		OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
427		    qid_atid));
428		cpl->local_port = inp->inp_lport;
429		cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0];
430		cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8];
431		cpl->peer_port = inp->inp_fport;
432		cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0];
433		cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8];
434		cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
435		    toep->rx_credits, toep->ulp_mode);
436		cpl->opt2 = calc_opt2a(so, toep);
437	} else {
438		struct cpl_act_open_req *cpl = wrtod(wr);
439		struct cpl_t5_act_open_req *cpl5 = (void *)cpl;
440		struct cpl_t6_act_open_req *cpl6 = (void *)cpl;
441
442		switch (chip_id(sc)) {
443		case CHELSIO_T4:
444			INIT_TP_WR(cpl, 0);
445			cpl->params = select_ntuple(vi, toep->l2te);
446			break;
447		case CHELSIO_T5:
448			INIT_TP_WR(cpl5, 0);
449			cpl5->iss = htobe32(tp->iss);
450			cpl5->params = select_ntuple(vi, toep->l2te);
451			break;
452		case CHELSIO_T6:
453		default:
454			INIT_TP_WR(cpl6, 0);
455			cpl6->iss = htobe32(tp->iss);
456			cpl6->params = select_ntuple(vi, toep->l2te);
457			break;
458		}
459		OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
460		    qid_atid));
461		inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port,
462		    &cpl->peer_ip, &cpl->peer_port);
463		cpl->opt0 = calc_opt0(so, vi, toep->l2te, mtu_idx, rscale,
464		    toep->rx_credits, toep->ulp_mode);
465		cpl->opt2 = calc_opt2a(so, toep);
466	}
467
468	CTR5(KTR_CXGBE, "%s: atid %u (%s), toep %p, inp %p", __func__,
469	    toep->tid, tcpstates[tp->t_state], toep, inp);
470
471	offload_socket(so, toep);
472	rc = t4_l2t_send(sc, wr, toep->l2te);
473	if (rc == 0) {
474		toep->flags |= TPF_CPL_PENDING;
475		return (0);
476	}
477
478	undo_offload_socket(so);
479	reason = __LINE__;
480failed:
481	CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc);
482
483	if (wr)
484		free_wrqe(wr);
485
486	if (toep) {
487		if (toep->tid >= 0)
488			free_atid(sc, toep->tid);
489		if (toep->l2te)
490			t4_l2t_release(toep->l2te);
491		if (toep->ce)
492			release_lip(td, toep->ce);
493		free_toepcb(toep);
494	}
495
496	return (rc);
497}
498#endif
499