t4_connect.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2012 Chelsio Communications, Inc.
 * All rights reserved.
 * Written by: Navdeep Parhar <np@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
 
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
 
#include "opt_inet.h"
#include "opt_inet6.h"
 
#ifdef TCP_OFFLOAD
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_vlan_var.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_var.h>
#include <netinet/toecore.h>
#include <netinet/cc/cc.h>
 
#include "common/common.h"
#include "common/t4_msg.h"
#include "common/t4_regs.h"
#include "common/t4_regs_values.h"
#include "t4_clip.h"
#include "tom/t4_tom_l2t.h"
#include "tom/t4_tom.h"
 
/*
 * Active open succeeded.
 */
static int
do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
    struct mbuf *m)
{
        struct adapter *sc = iq->adapter;
        const struct cpl_act_establish *cpl = (const void *)(rss + 1);
        u_int tid = GET_TID(cpl);
        u_int atid = G_TID_TID(ntohl(cpl->tos_atid));
        struct toepcb *toep = lookup_atid(sc, atid);
        struct inpcb *inp = toep->inp;
 
        KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
        KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
 
        CTR3(KTR_CXGBE, "%s: atid %u, tid %u", __func__, atid, tid);
        free_atid(sc, atid);
 
        CURVNET_SET(toep->vnet);
        INP_WLOCK(inp);
        toep->tid = tid;
        insert_tid(sc, tid, toep, inp->inp_vflag & INP_IPV6 ? 2 : 1);
        if (inp->inp_flags & INP_DROPPED) {
 
                /* socket closed by the kernel before hw told us it connected */
 
                send_flowc_wr(toep, NULL);
                send_reset(sc, toep, be32toh(cpl->snd_isn));
                goto done;
        }
 
        make_established(toep, be32toh(cpl->snd_isn) - 1,
            be32toh(cpl->rcv_isn) - 1, cpl->tcp_opt);
        inp->inp_flowtype = M_HASHTYPE_OPAQUE;
        inp->inp_flowid = tid;
 
done:
        INP_WUNLOCK(inp);
        CURVNET_RESTORE();
        return (0);
}
 
void
act_open_failure_cleanup(struct adapter *sc, u_int atid, u_int status)
{
        struct toepcb *toep = lookup_atid(sc, atid);
        struct inpcb *inp = toep->inp;
        struct toedev *tod = &toep->td->tod;
        struct epoch_tracker et;
 
        free_atid(sc, atid);
        toep->tid = -1;
 
        CURVNET_SET(toep->vnet);
        if (status != EAGAIN)
                NET_EPOCH_ENTER(et);
        INP_WLOCK(inp);
        toe_connect_failed(tod, inp, status);
        final_cpl_received(toep);       /* unlocks inp */
        if (status != EAGAIN)
                NET_EPOCH_EXIT(et);
        CURVNET_RESTORE();
}
 
/*
 * Active open failed.
 */
static int
do_act_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
    struct mbuf *m)
{
        struct adapter *sc = iq->adapter;
        const struct cpl_act_open_rpl *cpl = (const void *)(rss + 1);
        u_int atid = G_TID_TID(G_AOPEN_ATID(be32toh(cpl->atid_status)));
        u_int status = G_AOPEN_STATUS(be32toh(cpl->atid_status));
        struct toepcb *toep = lookup_atid(sc, atid);
        int rc;
 
        KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
        KASSERT(toep->tid == atid, ("%s: toep tid/atid mismatch", __func__));
 
        CTR3(KTR_CXGBE, "%s: atid %u, status %u ", __func__, atid, status);
 
        /* Ignore negative advice */
        if (negative_advice(status))
                return (0);
 
        if (status && act_open_has_tid(status))
                release_tid(sc, GET_TID(cpl), toep->ctrlq);
 
        rc = act_open_rpl_status_to_errno(status);
        act_open_failure_cleanup(sc, atid, rc);
 
        return (0);
}
 
void
t4_init_connect_cpl_handlers(void)
{
 
        t4_register_cpl_handler(CPL_ACT_ESTABLISH, do_act_establish);
        t4_register_shared_cpl_handler(CPL_ACT_OPEN_RPL, do_act_open_rpl,
            CPL_COOKIE_TOM);
}
 
void
t4_uninit_connect_cpl_handlers(void)
{
 
        t4_register_cpl_handler(CPL_ACT_ESTABLISH, NULL);
        t4_register_shared_cpl_handler(CPL_ACT_OPEN_RPL, NULL, CPL_COOKIE_TOM);
}
 
#ifdef KTR
#define DONT_OFFLOAD_ACTIVE_OPEN(x)     do { \
        reason = __LINE__; \
        rc = (x); \
        goto failed; \
} while (0)
#else
#define DONT_OFFLOAD_ACTIVE_OPEN(x)     do { \
        rc = (x); \
        goto failed; \
} while (0)
#endif
 
static inline int
act_open_cpl_size(struct adapter *sc, int isipv6)
{
        int idx;
        static const int sz_table[3][2] = {
                {
                        sizeof (struct cpl_act_open_req),
                        sizeof (struct cpl_act_open_req6)
                },
                {
                        sizeof (struct cpl_t5_act_open_req),
                        sizeof (struct cpl_t5_act_open_req6)
                },
                {
                        sizeof (struct cpl_t6_act_open_req),
                        sizeof (struct cpl_t6_act_open_req6)
                },
        };
 
        MPASS(chip_id(sc) >= CHELSIO_T4);
        idx = min(chip_id(sc) - CHELSIO_T4, 2);
 
        return (sz_table[idx][!!isipv6]);
}
 
/*
 * active open (soconnect).
 *
 * State of affairs on entry:
 * soisconnecting (so_state |= SS_ISCONNECTING)
 * tcbinfo not locked (This has changed - used to be WLOCKed)
 * inp WLOCKed
 * tp->t_state = TCPS_SYN_SENT
 * rtalloc1, RT_UNLOCK on rt.
 */
int
t4_connect(struct toedev *tod, struct socket *so, struct nhop_object *nh,
    struct sockaddr *nam)
{
        struct adapter *sc = tod->tod_softc;
        struct toepcb *toep = NULL;
        struct wrqe *wr = NULL;
        struct ifnet *rt_ifp = nh->nh_ifp;
        struct vi_info *vi;
        int qid_atid, rc, isipv6;
        struct inpcb *inp = sotoinpcb(so);
        struct tcpcb *tp = intotcpcb(inp);
#ifdef KTR
        int reason;
#endif
        struct offload_settings settings;
        struct epoch_tracker et;
        uint16_t vid = 0xfff, pcp = 0;
 
        INP_WLOCK_ASSERT(inp);
        KASSERT(nam->sa_family == AF_INET || nam->sa_family == AF_INET6,
            ("%s: dest addr %p has family %u", __func__, nam, nam->sa_family));
 
        if (rt_ifp->if_type == IFT_ETHER)
                vi = rt_ifp->if_softc;
        else if (rt_ifp->if_type == IFT_L2VLAN) {
                struct ifnet *ifp = VLAN_TRUNKDEV(rt_ifp);
 
                vi = ifp->if_softc;
                VLAN_TAG(rt_ifp, &vid);
                VLAN_PCP(rt_ifp, &pcp);
        } else if (rt_ifp->if_type == IFT_IEEE8023ADLAG)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOSYS); /* XXX: implement lagg+TOE */
        else
                DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
        if (sc->flags & KERN_TLS_ON)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
 
        rw_rlock(&sc->policy_lock);
        settings = *lookup_offload_policy(sc, OPEN_TYPE_ACTIVE, NULL,
            EVL_MAKETAG(vid, pcp, 0), inp);
        rw_runlock(&sc->policy_lock);
        if (!settings.offload)
                DONT_OFFLOAD_ACTIVE_OPEN(EPERM);
 
        toep = alloc_toepcb(vi, M_NOWAIT);
        if (toep == NULL)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
 
        toep->tid = alloc_atid(sc, toep);
        if (toep->tid < 0)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
 
        toep->l2te = t4_l2t_get(vi->pi, rt_ifp,
            nh->nh_flags & NHF_GATEWAY ? &nh->gw_sa : nam);
        if (toep->l2te == NULL)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
 
        toep->vnet = so->so_vnet;
        init_conn_params(vi, &settings, &inp->inp_inc, so, NULL,
            toep->l2te->idx, &toep->params);
        init_toepcb(vi, toep);
 
        isipv6 = nam->sa_family == AF_INET6;
        wr = alloc_wrqe(act_open_cpl_size(sc, isipv6), toep->ctrlq);
        if (wr == NULL)
                DONT_OFFLOAD_ACTIVE_OPEN(ENOMEM);
 
        qid_atid = V_TID_QID(toep->ofld_rxq->iq.abs_id) | V_TID_TID(toep->tid) |
            V_TID_COOKIE(CPL_COOKIE_TOM);
 
        if (isipv6) {
                struct cpl_act_open_req6 *cpl = wrtod(wr);
                struct cpl_t5_act_open_req6 *cpl5 = (void *)cpl;
                struct cpl_t6_act_open_req6 *cpl6 = (void *)cpl;
 
                if ((inp->inp_vflag & INP_IPV6) == 0)
                        DONT_OFFLOAD_ACTIVE_OPEN(ENOTSUP);
 
                toep->ce = t4_get_clip_entry(sc, &inp->in6p_laddr, true);
                if (toep->ce == NULL)
                        DONT_OFFLOAD_ACTIVE_OPEN(ENOENT);
 
                switch (chip_id(sc)) {
                case CHELSIO_T4:
                        INIT_TP_WR(cpl, 0);
                        cpl->params = select_ntuple(vi, toep->l2te);
                        break;
                case CHELSIO_T5:
                        INIT_TP_WR(cpl5, 0);
                        cpl5->iss = htobe32(tp->iss);
                        cpl5->params = select_ntuple(vi, toep->l2te);
                        break;
                case CHELSIO_T6:
                default:
                        INIT_TP_WR(cpl6, 0);
                        cpl6->iss = htobe32(tp->iss);
                        cpl6->params = select_ntuple(vi, toep->l2te);
                        break;
                }
                OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
                    qid_atid));
                cpl->local_port = inp->inp_lport;
                cpl->local_ip_hi = *(uint64_t *)&inp->in6p_laddr.s6_addr[0];
                cpl->local_ip_lo = *(uint64_t *)&inp->in6p_laddr.s6_addr[8];
                cpl->peer_port = inp->inp_fport;
                cpl->peer_ip_hi = *(uint64_t *)&inp->in6p_faddr.s6_addr[0];
                cpl->peer_ip_lo = *(uint64_t *)&inp->in6p_faddr.s6_addr[8];
                cpl->opt0 = calc_options0(vi, &toep->params);
                cpl->opt2 = calc_options2(vi, &toep->params);
 
                CTR6(KTR_CXGBE,
                    "%s: atid %u, toep %p, inp %p, opt0 %#016lx, opt2 %#08x",
                    __func__, toep->tid, toep, inp, be64toh(cpl->opt0),
                    be32toh(cpl->opt2));
        } else {
                struct cpl_act_open_req *cpl = wrtod(wr);
                struct cpl_t5_act_open_req *cpl5 = (void *)cpl;
                struct cpl_t6_act_open_req *cpl6 = (void *)cpl;
 
                switch (chip_id(sc)) {
                case CHELSIO_T4:
                        INIT_TP_WR(cpl, 0);
                        cpl->params = select_ntuple(vi, toep->l2te);
                        break;
                case CHELSIO_T5:
                        INIT_TP_WR(cpl5, 0);
                        cpl5->iss = htobe32(tp->iss);
                        cpl5->params = select_ntuple(vi, toep->l2te);
                        break;
                case CHELSIO_T6:
                default:
                        INIT_TP_WR(cpl6, 0);
                        cpl6->iss = htobe32(tp->iss);
                        cpl6->params = select_ntuple(vi, toep->l2te);
                        break;
                }
                OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
                    qid_atid));
                inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port,
                    &cpl->peer_ip, &cpl->peer_port);
                cpl->opt0 = calc_options0(vi, &toep->params);
                cpl->opt2 = calc_options2(vi, &toep->params);
 
                CTR6(KTR_CXGBE,
                    "%s: atid %u, toep %p, inp %p, opt0 %#016lx, opt2 %#08x",
                    __func__, toep->tid, toep, inp, be64toh(cpl->opt0),
                    be32toh(cpl->opt2));
        }
 
        offload_socket(so, toep);
        NET_EPOCH_ENTER(et);
        rc = t4_l2t_send(sc, wr, toep->l2te);
        NET_EPOCH_EXIT(et);
        if (rc == 0) {
                toep->flags |= TPF_CPL_PENDING;
                return (0);
        }
 
        undo_offload_socket(so);
#if defined(KTR)
        reason = __LINE__;
#endif
failed:
        CTR3(KTR_CXGBE, "%s: not offloading (%d), rc %d", __func__, reason, rc);
 
        if (wr)
                free_wrqe(wr);
 
        if (toep) {
                if (toep->tid >= 0)
                        free_atid(sc, toep->tid);
                if (toep->l2te)
                        t4_l2t_release(toep->l2te);
                if (toep->ce)
                        t4_release_clip_entry(sc, toep->ce);
                free_toepcb(toep);
        }
 
        return (rc);
}
#endif