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cxgbe/t4_tom: fixes for issues on the passive open side.

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- Fix PR 227760 by getting the TOE to respond to the SYN after the call
  to toe_syncache_add, not during it.  The kernel syncache code calls
  syncache_respond just before syncache_insert.  If the ACK to the
  syncache_respond is processed in another thread it may run before the
  syncache_insert and won't find the entry.  Note that this affects only
  t4_tom because it's the only driver trying to insert and expand
  syncache entries from different threads.

- Do not leak resources if an embryonic connection terminates at
  SYN_RCVD because of L2 lookup failures.

- Retire lctx->synq and associated code because there is never a need to
  walk the list of embryonic connections associated with a listener.
  The per-tid state is still called a synq entry in the driver even
  though the synq itself is now gone.

PR:		227760
MFC after:	2 weeks
Sponsored by:	Chelsio Communications
This commit is contained in:
Navdeep Parhar 2018-12-19 01:37:00 +00:00
parent 26e9d9b01f
commit b156a400a6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=342208
5 changed files with 284 additions and 404 deletions
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3
sys/dev/cxgbe/tom/t4_connect.c
View File

@ -99,7 +99,8 @@ do_act_establish(struct sge_iq *iq, const struct rss_header *rss,
goto done;
}
make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
make_established(toep, be32toh(cpl->snd_isn) - 1,
be32toh(cpl->rcv_isn) - 1, cpl->tcp_opt);
if (toep->ulp_mode == ULP_MODE_TLS)
tls_establish(toep);

51
sys/dev/cxgbe/tom/t4_cpl_io.c
View File

@ -373,18 +373,15 @@ assign_rxopt(struct tcpcb *tp, unsigned int opt)
* Completes some final bits of initialization for just established connections
* and changes their state to TCPS_ESTABLISHED.
*
* The ISNs are from after the exchange of SYNs. i.e., the true ISN + 1.
* The ISNs are from the exchange of SYNs.
*/
void
make_established(struct toepcb *toep, uint32_t snd_isn, uint32_t rcv_isn,
uint16_t opt)
make_established(struct toepcb *toep, uint32_t iss, uint32_t irs, uint16_t opt)
{
struct inpcb *inp = toep->inp;
struct socket *so = inp->inp_socket;
struct tcpcb *tp = intotcpcb(inp);
long bufsize;
uint32_t iss = be32toh(snd_isn) - 1; /* true ISS */
uint32_t irs = be32toh(rcv_isn) - 1; /* true IRS */
uint16_t tcpopt = be16toh(opt);
struct flowc_tx_params ftxp;
@ -1245,22 +1242,12 @@ do_peer_close(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m)
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
if (__predict_false(toep->flags & TPF_SYNQE)) {
#ifdef INVARIANTS
struct synq_entry *synqe = (void *)toep;
INP_WLOCK(synqe->lctx->inp);
if (synqe->flags & TPF_SYNQE_HAS_L2TE) {
KASSERT(synqe->flags & TPF_ABORT_SHUTDOWN,
("%s: listen socket closed but tid %u not aborted.",
__func__, tid));
} else {
/*
* do_pass_accept_req is still running and will
* eventually take care of this tid.
*/
}
INP_WUNLOCK(synqe->lctx->inp);
#endif
/*
* do_pass_establish must have run before do_peer_close and if
* this is still a synqe instead of a toepcb then the connection
* must be getting aborted.
*/
MPASS(toep->flags & TPF_ABORT_SHUTDOWN);
CTR4(KTR_CXGBE, "%s: tid %u, synqe %p (0x%x)", __func__, tid,
toep, toep->flags);
return (0);
@ -1568,22 +1555,12 @@ do_rx_data(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m)
uint32_t ddp_placed = 0;
if (__predict_false(toep->flags & TPF_SYNQE)) {
#ifdef INVARIANTS
struct synq_entry *synqe = (void *)toep;
INP_WLOCK(synqe->lctx->inp);
if (synqe->flags & TPF_SYNQE_HAS_L2TE) {
KASSERT(synqe->flags & TPF_ABORT_SHUTDOWN,
("%s: listen socket closed but tid %u not aborted.",
__func__, tid));
} else {
/*
* do_pass_accept_req is still running and will
* eventually take care of this tid.
*/
}
INP_WUNLOCK(synqe->lctx->inp);
#endif
/*
* do_pass_establish must have run before do_rx_data and if this
* is still a synqe instead of a toepcb then the connection must
* be getting aborted.
*/
MPASS(toep->flags & TPF_ABORT_SHUTDOWN);
CTR4(KTR_CXGBE, "%s: tid %u, synqe %p (0x%x)", __func__, tid,
toep, toep->flags);
m_freem(m);

592
sys/dev/cxgbe/tom/t4_listen.c
View File

@ -87,9 +87,6 @@ static struct listen_ctx *listen_hash_find(struct adapter *, struct inpcb *);
static struct listen_ctx *listen_hash_del(struct adapter *, struct inpcb *);
static struct inpcb *release_lctx(struct adapter *, struct listen_ctx *);
static inline void save_qids_in_mbuf(struct mbuf *, struct vi_info *,
struct offload_settings *);
static inline void get_qids_from_mbuf(struct mbuf *m, int *, int *);
static void send_reset_synqe(struct toedev *, struct synq_entry *);
static int
@ -223,7 +220,6 @@ alloc_lctx(struct adapter *sc, struct inpcb *inp, struct vi_info *vi)
lctx->ctrlq = &sc->sge.ctrlq[vi->pi->port_id];
lctx->ofld_rxq = &sc->sge.ofld_rxq[vi->first_ofld_rxq];
refcount_init(&lctx->refcount, 1);
TAILQ_INIT(&lctx->synq);
lctx->inp = inp;
lctx->vnet = inp->inp_socket->so_vnet;
@ -241,8 +237,6 @@ free_lctx(struct adapter *sc, struct listen_ctx *lctx)
INP_WLOCK_ASSERT(inp);
KASSERT(lctx->refcount == 0,
("%s: refcount %d", __func__, lctx->refcount));
KASSERT(TAILQ_EMPTY(&lctx->synq),
("%s: synq not empty.", __func__));
KASSERT(lctx->stid >= 0, ("%s: bad stid %d.", __func__, lctx->stid));
CTR4(KTR_CXGBE, "%s: stid %u, lctx %p, inp %p",
@ -358,7 +352,7 @@ send_reset_synqe(struct toedev *tod, struct synq_entry *synqe)
struct wrqe *wr;
struct fw_flowc_wr *flowc;
struct cpl_abort_req *req;
int txqid, rxqid, flowclen;
int flowclen;
struct sge_wrq *ofld_txq;
struct sge_ofld_rxq *ofld_rxq;
const int nparams = 6;
@ -374,9 +368,8 @@ send_reset_synqe(struct toedev *tod, struct synq_entry *synqe)
return; /* abort already in progress */
synqe->flags |= TPF_ABORT_SHUTDOWN;
get_qids_from_mbuf(m, &txqid, &rxqid);
ofld_txq = &sc->sge.ofld_txq[txqid];
ofld_rxq = &sc->sge.ofld_rxq[rxqid];
ofld_txq = &sc->sge.ofld_txq[synqe->txqid];
ofld_rxq = &sc->sge.ofld_rxq[synqe->rxqid];
/* The wrqe will have two WRs - a flowc followed by an abort_req */
flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval);
@ -606,7 +599,6 @@ t4_listen_stop(struct toedev *tod, struct tcpcb *tp)
struct listen_ctx *lctx;
struct adapter *sc = tod->tod_softc;
struct inpcb *inp = tp->t_inpcb;
struct synq_entry *synqe;
INP_WLOCK_ASSERT(inp);
@ -622,25 +614,33 @@ t4_listen_stop(struct toedev *tod, struct tcpcb *tp)
* arrive and clean up when it does.
*/
if (lctx->flags & LCTX_RPL_PENDING) {
KASSERT(TAILQ_EMPTY(&lctx->synq),
("%s: synq not empty.", __func__));
return (EINPROGRESS);
}
/*
* The host stack will abort all the connections on the listening
* socket's so_comp. It doesn't know about the connections on the synq
* so we need to take care of those.
*/
TAILQ_FOREACH(synqe, &lctx->synq, link) {
if (synqe->flags & TPF_SYNQE_HAS_L2TE)
send_reset_synqe(tod, synqe);
}
destroy_server(sc, lctx);
return (0);
}
static inline struct synq_entry *
alloc_synqe(struct adapter *sc __unused, struct listen_ctx *lctx, int flags)
{
struct synq_entry *synqe;
INP_WLOCK_ASSERT(lctx->inp);
MPASS(flags == M_WAITOK || flags == M_NOWAIT);
synqe = malloc(sizeof(*synqe), M_CXGBE, flags);
if (__predict_true(synqe != NULL)) {
synqe->flags = TPF_SYNQE;
refcount_init(&synqe->refcnt, 1);
synqe->lctx = lctx;
hold_lctx(lctx); /* Every synqe has a ref on its lctx. */
synqe->syn = NULL;
}
return (synqe);
}
static inline void
hold_synqe(struct synq_entry *synqe)
{
@ -648,17 +648,25 @@ hold_synqe(struct synq_entry *synqe)
refcount_acquire(&synqe->refcnt);
}
static inline void
release_synqe(struct synq_entry *synqe)
static inline struct inpcb *
release_synqe(struct adapter *sc, struct synq_entry *synqe)
{
struct inpcb *inp;
MPASS(synqe->flags & TPF_SYNQE);
MPASS(synqe->lctx != NULL);
inp = synqe->lctx->inp;
MPASS(inp != NULL);
INP_WLOCK_ASSERT(inp);
if (refcount_release(&synqe->refcnt)) {
int needfree = synqe->flags & TPF_SYNQE_NEEDFREE;
inp = release_lctx(sc, synqe->lctx);
m_freem(synqe->syn);
if (needfree)
free(synqe, M_CXGBE);
free(synqe, M_CXGBE);
}
return (inp);
}
void
@ -670,51 +678,45 @@ t4_syncache_added(struct toedev *tod __unused, void *arg)
}
void
t4_syncache_removed(struct toedev *tod __unused, void *arg)
t4_syncache_removed(struct toedev *tod, void *arg)
{
struct adapter *sc = tod->tod_softc;
struct synq_entry *synqe = arg;
struct inpcb *inp = synqe->lctx->inp;
release_synqe(synqe);
/*
* XXX: this is a LOR but harmless when running from the softclock.
*/
INP_WLOCK(inp);
inp = release_synqe(sc, synqe);
if (inp != NULL)
INP_WUNLOCK(inp);
}
int
t4_syncache_respond(struct toedev *tod, void *arg, struct mbuf *m)
{
struct adapter *sc = tod->tod_softc;
struct synq_entry *synqe = arg;
struct wrqe *wr;
struct l2t_entry *e;
struct tcpopt to;
struct ip *ip = mtod(m, struct ip *);
struct tcphdr *th;
wr = (struct wrqe *)atomic_readandclear_ptr(&synqe->wr);
if (wr == NULL) {
m_freem(m);
return (EALREADY);
if (atomic_fetchadd_int(&synqe->ok_to_respond, 1) == 0) {
struct tcpopt to;
struct ip *ip = mtod(m, struct ip *);
struct tcphdr *th;
if (ip->ip_v == IPVERSION)
th = (void *)(ip + 1);
else
th = (void *)((struct ip6_hdr *)ip + 1);
bzero(&to, sizeof(to));
tcp_dooptions(&to, (void *)(th + 1),
(th->th_off << 2) - sizeof(*th), TO_SYN);
/* save these for later */
synqe->iss = be32toh(th->th_seq);
synqe->irs = be32toh(th->th_ack) - 1;
synqe->ts = to.to_tsval;
}
if (ip->ip_v == IPVERSION)
th = (void *)(ip + 1);
else
th = (void *)((struct ip6_hdr *)ip + 1);
bzero(&to, sizeof(to));
tcp_dooptions(&to, (void *)(th + 1), (th->th_off << 2) - sizeof(*th),
TO_SYN);
/* save these for later */
synqe->iss = be32toh(th->th_seq);
synqe->ts = to.to_tsval;
if (chip_id(sc) >= CHELSIO_T5) {
struct cpl_t5_pass_accept_rpl *rpl5 = wrtod(wr);
rpl5->iss = th->th_seq;
}
e = &sc->l2t->l2tab[synqe->l2e_idx];
t4_l2t_send(sc, wr, e);
m_freem(m); /* don't need this any more */
return (0);
}
@ -834,21 +836,27 @@ done_with_synqe(struct adapter *sc, struct synq_entry *synqe)
{
struct listen_ctx *lctx = synqe->lctx;
struct inpcb *inp = lctx->inp;
struct vi_info *vi = synqe->syn->m_pkthdr.rcvif->if_softc;
struct l2t_entry *e = &sc->l2t->l2tab[synqe->l2e_idx];
int ntids;
INP_WLOCK_ASSERT(inp);
ntids = inp->inp_vflag & INP_IPV6 ? 2 : 1;
TAILQ_REMOVE(&lctx->synq, synqe, link);
inp = release_lctx(sc, lctx);
remove_tid(sc, synqe->tid, ntids);
release_tid(sc, synqe->tid, lctx->ctrlq);
t4_l2t_release(e);
inp = release_synqe(sc, synqe);
if (inp)
INP_WUNLOCK(inp);
remove_tid(sc, synqe->tid, ntids);
release_tid(sc, synqe->tid, &sc->sge.ctrlq[vi->pi->port_id]);
t4_l2t_release(e);
release_synqe(synqe); /* removed from synq list */
}
void
synack_failure_cleanup(struct adapter *sc, int tid)
{
struct synq_entry *synqe = lookup_tid(sc, tid);
INP_WLOCK(synqe->lctx->inp);
done_with_synqe(sc, synqe);
}
int
@ -861,7 +869,6 @@ do_abort_req_synqe(struct sge_iq *iq, const struct rss_header *rss,
struct synq_entry *synqe = lookup_tid(sc, tid);
struct listen_ctx *lctx = synqe->lctx;
struct inpcb *inp = lctx->inp;
int txqid;
struct sge_wrq *ofld_txq;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
@ -880,8 +887,7 @@ do_abort_req_synqe(struct sge_iq *iq, const struct rss_header *rss,
INP_WLOCK(inp);
get_qids_from_mbuf(synqe->syn, &txqid, NULL);
ofld_txq = &sc->sge.ofld_txq[txqid];
ofld_txq = &sc->sge.ofld_txq[synqe->txqid];
/*
* If we'd initiated an abort earlier the reply to it is responsible for
@ -941,23 +947,23 @@ t4_offload_socket(struct toedev *tod, void *arg, struct socket *so)
#ifdef INVARIANTS
struct inpcb *inp = sotoinpcb(so);
#endif
struct cpl_pass_establish *cpl = mtod(synqe->syn, void *);
struct toepcb *toep = *(struct toepcb **)(cpl + 1);
struct toepcb *toep = synqe->toep;
INP_INFO_RLOCK_ASSERT(&V_tcbinfo); /* prevents bad race with accept() */
INP_WLOCK_ASSERT(inp);
KASSERT(synqe->flags & TPF_SYNQE,
("%s: %p not a synq_entry?", __func__, arg));
MPASS(toep->tid == synqe->tid);
offload_socket(so, toep);
make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
make_established(toep, synqe->iss, synqe->irs, synqe->tcp_opt);
toep->flags |= TPF_CPL_PENDING;
update_tid(sc, synqe->tid, toep);
synqe->flags |= TPF_SYNQE_EXPANDED;
}
static inline void
save_qids_in_mbuf(struct mbuf *m, struct vi_info *vi,
save_qids_in_synqe(struct synq_entry *synqe, struct vi_info *vi,
struct offload_settings *s)
{
uint32_t txqid, rxqid;
@ -974,41 +980,8 @@ save_qids_in_mbuf(struct mbuf *m, struct vi_info *vi,
rxqid = arc4random() % vi->nofldrxq;
rxqid += vi->first_ofld_rxq;
m->m_pkthdr.flowid = (txqid << 16) | (rxqid & 0xffff);
}
static inline void
get_qids_from_mbuf(struct mbuf *m, int *txqid, int *rxqid)
{
if (txqid)
*txqid = m->m_pkthdr.flowid >> 16;
if (rxqid)
*rxqid = m->m_pkthdr.flowid & 0xffff;
}
/*
* Use the trailing space in the mbuf in which the PASS_ACCEPT_REQ arrived to
* store some state temporarily.
*/
static struct synq_entry *
mbuf_to_synqe(struct mbuf *m)
{
int len = roundup2(sizeof (struct synq_entry), 8);
int tspace = M_TRAILINGSPACE(m);
struct synq_entry *synqe = NULL;
if (tspace < len) {
synqe = malloc(sizeof(*synqe), M_CXGBE, M_NOWAIT);
if (synqe == NULL)
return (NULL);
synqe->flags = TPF_SYNQE | TPF_SYNQE_NEEDFREE;
} else {
synqe = (void *)(m->m_data + m->m_len + tspace - len);
synqe->flags = TPF_SYNQE;
}
return (synqe);
synqe->txqid = txqid;
synqe->rxqid = rxqid;
}
static void
@ -1210,7 +1183,39 @@ get_l2te_for_nexthop(struct port_info *pi, struct ifnet *ifp,
return (e);
}
#define REJECT_PASS_ACCEPT() do { \
static int
send_synack(struct adapter *sc, struct synq_entry *synqe, uint64_t opt0,
uint32_t opt2, int tid)
{
struct wrqe *wr;
struct cpl_pass_accept_rpl *rpl;
struct l2t_entry *e = &sc->l2t->l2tab[synqe->l2e_idx];
wr = alloc_wrqe(is_t4(sc) ? sizeof(struct cpl_pass_accept_rpl) :
sizeof(struct cpl_t5_pass_accept_rpl), &sc->sge.ctrlq[0]);
if (wr == NULL)
return (ENOMEM);
rpl = wrtod(wr);
if (is_t4(sc))
INIT_TP_WR_MIT_CPL(rpl, CPL_PASS_ACCEPT_RPL, tid);
else {
struct cpl_t5_pass_accept_rpl *rpl5 = (void *)rpl;
INIT_TP_WR_MIT_CPL(rpl5, CPL_PASS_ACCEPT_RPL, tid);
rpl5->iss = htobe32(synqe->iss);
}
rpl->opt0 = opt0;
rpl->opt2 = opt2;
return (t4_l2t_send(sc, wr, e));
}
#define REJECT_PASS_ACCEPT_REQ(tunnel) do { \
if (!tunnel) { \
m_freem(m); \
m = NULL; \
} \
reject_reason = __LINE__; \
goto reject; \
} while (0)
@ -1234,8 +1239,6 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
struct adapter *sc = iq->adapter;
struct toedev *tod;
const struct cpl_pass_accept_req *cpl = mtod(m, const void *);
struct cpl_pass_accept_rpl *rpl;
struct wrqe *wr;
unsigned int stid = G_PASS_OPEN_TID(be32toh(cpl->tos_stid));
unsigned int tid = GET_TID(cpl);
struct listen_ctx *lctx = lookup_stid(sc, stid);
@ -1248,11 +1251,9 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
struct vi_info *vi;
struct ifnet *hw_ifp, *ifp;
struct l2t_entry *e = NULL;
int rscale, mtu_idx, rx_credits, rxqid, ulp_mode;
struct synq_entry *synqe = NULL;
int reject_reason, v, ntids;
uint16_t vid;
u_int wnd;
uint16_t vid, l2info;
struct epoch_tracker et;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
@ -1266,35 +1267,34 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
CTR4(KTR_CXGBE, "%s: stid %u, tid %u, lctx %p", __func__, stid, tid,
lctx);
pass_accept_req_to_protohdrs(sc, m, &inc, &th);
t4opt_to_tcpopt(&cpl->tcpopt, &to);
pi = sc->port[G_SYN_INTF(be16toh(cpl->l2info))];
CURVNET_SET(lctx->vnet);
CURVNET_SET(lctx->vnet); /* before any potential REJECT */
/*
* Use the MAC index to lookup the associated VI. If this SYN
* didn't match a perfect MAC filter, punt.
* Use the MAC index to lookup the associated VI. If this SYN didn't
* match a perfect MAC filter, punt.
*/
if (!(be16toh(cpl->l2info) & F_SYN_XACT_MATCH)) {
m_freem(m);
m = NULL;
REJECT_PASS_ACCEPT();
l2info = be16toh(cpl->l2info);
pi = sc->port[G_SYN_INTF(l2info)];
if (!(l2info & F_SYN_XACT_MATCH)) {
REJECT_PASS_ACCEPT_REQ(false);
}
for_each_vi(pi, v, vi) {
if (vi->xact_addr_filt == G_SYN_MAC_IDX(be16toh(cpl->l2info)))
if (vi->xact_addr_filt == G_SYN_MAC_IDX(l2info))
goto found;
}
m_freem(m);
m = NULL;
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(false);
found:
hw_ifp = vi->ifp; /* the (v)cxgbeX ifnet */
hw_ifp = vi->ifp; /* the cxgbe ifnet */
m->m_pkthdr.rcvif = hw_ifp;
tod = TOEDEV(hw_ifp);
/*
* Don't offload if the peer requested a TCP option that's not known to
* the silicon. Send the SYN to the kernel instead.
*/
if (__predict_false(cpl->tcpopt.unknown))
REJECT_PASS_ACCEPT_REQ(true);
/*
* Figure out if there is a pseudo interface (vlan, lagg, etc.)
* involved. Don't offload if the SYN had a VLAN tag and the vid
@ -1306,75 +1306,57 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
if (vid != 0xfff && vid != 0) {
ifp = VLAN_DEVAT(hw_ifp, vid);
if (ifp == NULL)
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(true);
} else
ifp = hw_ifp;
/*
* Don't offload if the peer requested a TCP option that's not known to
* the silicon.
*/
if (cpl->tcpopt.unknown)
REJECT_PASS_ACCEPT();
if (inc.inc_flags & INC_ISIPV6) {
/* Don't offload if the ifcap isn't enabled */
if ((ifp->if_capenable & IFCAP_TOE6) == 0)
REJECT_PASS_ACCEPT();
/*
* SYN must be directed to an IP6 address on this ifnet. This
* is more restrictive than in6_localip.
*/
if (!in6_ifhasaddr(ifp, &inc.inc6_laddr))
REJECT_PASS_ACCEPT();
ntids = 2;
} else {
/* Don't offload if the ifcap isn't enabled */
if ((ifp->if_capenable & IFCAP_TOE4) == 0)
REJECT_PASS_ACCEPT();
/*
* SYN must be directed to an IP address on this ifnet. This
* is more restrictive than in_localip.
*/
if (!in_ifhasaddr(ifp, inc.inc_laddr))
REJECT_PASS_ACCEPT();
ntids = 1;
}
/*
* Don't offload if the ifnet that the SYN came in on is not in the same
* vnet as the listening socket.
*/
if (lctx->vnet != ifp->if_vnet)
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(true);
pass_accept_req_to_protohdrs(sc, m, &inc, &th);
if (inc.inc_flags & INC_ISIPV6) {
/* Don't offload if the ifcap isn't enabled */
if ((ifp->if_capenable & IFCAP_TOE6) == 0)
REJECT_PASS_ACCEPT_REQ(true);
/*
* SYN must be directed to an IP6 address on this ifnet. This
* is more restrictive than in6_localip.
*/
if (!in6_ifhasaddr(ifp, &inc.inc6_laddr))
REJECT_PASS_ACCEPT_REQ(true);
ntids = 2;
} else {
/* Don't offload if the ifcap isn't enabled */
if ((ifp->if_capenable & IFCAP_TOE4) == 0)
REJECT_PASS_ACCEPT_REQ(true);
/*
* SYN must be directed to an IP address on this ifnet. This
* is more restrictive than in_localip.
*/
if (!in_ifhasaddr(ifp, inc.inc_laddr))
REJECT_PASS_ACCEPT_REQ(true);
ntids = 1;
}
e = get_l2te_for_nexthop(pi, ifp, &inc);
if (e == NULL)
REJECT_PASS_ACCEPT();
synqe = mbuf_to_synqe(m);
if (synqe == NULL)
REJECT_PASS_ACCEPT();
wr = alloc_wrqe(is_t4(sc) ? sizeof(struct cpl_pass_accept_rpl) :
sizeof(struct cpl_t5_pass_accept_rpl), &sc->sge.ctrlq[pi->port_id]);
if (wr == NULL)
REJECT_PASS_ACCEPT();
rpl = wrtod(wr);
INP_INFO_RLOCK_ET(&V_tcbinfo, et); /* for 4-tuple check */
REJECT_PASS_ACCEPT_REQ(true);
/* Don't offload if the 4-tuple is already in use */
INP_INFO_RLOCK_ET(&V_tcbinfo, et); /* for 4-tuple check */
if (toe_4tuple_check(&inc, &th, ifp) != 0) {
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(false);
}
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
@ -1383,14 +1365,8 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
/* Don't offload if the listening socket has closed */
if (__predict_false(inp->inp_flags & INP_DROPPED)) {
/*
* The listening socket has closed. The reply from the TOE to
* our CPL_CLOSE_LISTSRV_REQ will ultimately release all
* resources tied to this listen context.
*/
INP_WUNLOCK(inp);
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(false);
}
so = inp->inp_socket;
rw_rlock(&sc->policy_lock);
@ -1399,119 +1375,65 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
rw_runlock(&sc->policy_lock);
if (!settings.offload) {
INP_WUNLOCK(inp);
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
REJECT_PASS_ACCEPT_REQ(true); /* Rejected by COP. */
}
mtu_idx = find_best_mtu_idx(sc, &inc, &settings);
rscale = cpl->tcpopt.wsf && V_tcp_do_rfc1323 ? select_rcv_wscale() : 0;
/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
wnd = max(so->sol_sbrcv_hiwat, MIN_RCV_WND);
wnd = min(wnd, MAX_RCV_WND);
rx_credits = min(wnd >> 10, M_RCV_BUFSIZ);
save_qids_in_mbuf(m, vi, &settings);
get_qids_from_mbuf(m, NULL, &rxqid);
if (is_t4(sc))
INIT_TP_WR_MIT_CPL(rpl, CPL_PASS_ACCEPT_RPL, tid);
else {
struct cpl_t5_pass_accept_rpl *rpl5 = (void *)rpl;
INIT_TP_WR_MIT_CPL(rpl5, CPL_PASS_ACCEPT_RPL, tid);
synqe = alloc_synqe(sc, lctx, M_NOWAIT);
if (synqe == NULL) {
INP_WUNLOCK(inp);
REJECT_PASS_ACCEPT_REQ(true);
}
ulp_mode = select_ulp_mode(so, sc, &settings);
switch (ulp_mode) {
case ULP_MODE_TCPDDP:
synqe->flags |= TPF_SYNQE_TCPDDP;
break;
case ULP_MODE_TLS:
synqe->flags |= TPF_SYNQE_TLS;
break;
}
rpl->opt0 = calc_opt0(so, vi, e, mtu_idx, rscale, rx_credits, ulp_mode,
&settings);
rpl->opt2 = calc_opt2p(sc, pi, rxqid, &cpl->tcpopt, &th, ulp_mode,
CC_ALGO(intotcpcb(inp)), &settings);
synqe->tid = tid;
synqe->lctx = lctx;
synqe->syn = m;
m = NULL;
refcount_init(&synqe->refcnt, 1); /* 1 means extra hold */
synqe->l2e_idx = e->idx;
synqe->rcv_bufsize = rx_credits;
atomic_store_rel_ptr(&synqe->wr, (uintptr_t)wr);
insert_tid(sc, tid, synqe, ntids);
TAILQ_INSERT_TAIL(&lctx->synq, synqe, link);
hold_synqe(synqe); /* hold for the duration it's in the synq */
hold_lctx(lctx); /* A synqe on the list has a ref on its lctx */
atomic_store_int(&synqe->ok_to_respond, 0);
/*
* If all goes well t4_syncache_respond will get called during
* syncache_add. Note that syncache_add releases the pcb lock.
*/
t4opt_to_tcpopt(&cpl->tcpopt, &to);
toe_syncache_add(&inc, &to, &th, inp, tod, synqe);
INP_UNLOCK_ASSERT(inp); /* ok to assert, we have a ref on the inp */
/*
* If we replied during syncache_add (synqe->wr has been consumed),
* good. Otherwise, set it to 0 so that further syncache_respond
* attempts by the kernel will be ignored.
*/
if (atomic_cmpset_ptr(&synqe->wr, (uintptr_t)wr, 0)) {
if (atomic_load_int(&synqe->ok_to_respond) > 0) {
uint64_t opt0;
uint32_t opt2;
u_int wnd;
int rscale, mtu_idx, rx_credits;
/*
* syncache may or may not have a hold on the synqe, which may
* or may not be stashed in the original SYN mbuf passed to us.
* Just copy it over instead of dealing with all possibilities.
*/
m = m_dup(synqe->syn, M_NOWAIT);
if (m)
m->m_pkthdr.rcvif = hw_ifp;
mtu_idx = find_best_mtu_idx(sc, &inc, &settings);
rscale = cpl->tcpopt.wsf && V_tcp_do_rfc1323 ? select_rcv_wscale() : 0;
/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
wnd = max(so->sol_sbrcv_hiwat, MIN_RCV_WND);
wnd = min(wnd, MAX_RCV_WND);
rx_credits = min(wnd >> 10, M_RCV_BUFSIZ);
remove_tid(sc, synqe->tid, ntids);
free(wr, M_CXGBE);
save_qids_in_synqe(synqe, vi, &settings);
synqe->ulp_mode = select_ulp_mode(so, sc, &settings);
/* Yank the synqe out of the lctx synq. */
INP_WLOCK(inp);
TAILQ_REMOVE(&lctx->synq, synqe, link);
release_synqe(synqe); /* removed from synq list */
inp = release_lctx(sc, lctx);
if (inp)
INP_WUNLOCK(inp);
opt0 = calc_opt0(so, vi, e, mtu_idx, rscale, rx_credits,
synqe->ulp_mode, &settings);
opt2 = calc_opt2p(sc, pi, synqe->rxqid, &cpl->tcpopt, &th,
synqe->ulp_mode, CC_ALGO(intotcpcb(inp)), &settings);
release_synqe(synqe); /* extra hold */
REJECT_PASS_ACCEPT();
}
insert_tid(sc, tid, synqe, ntids);
synqe->tid = tid;
synqe->l2e_idx = e->idx;
synqe->rcv_bufsize = rx_credits;
synqe->syn = m;
m = NULL;
CTR6(KTR_CXGBE, "%s: stid %u, tid %u, lctx %p, synqe %p, SYNACK mode %d",
__func__, stid, tid, lctx, synqe, ulp_mode);
if (send_synack(sc, synqe, opt0, opt2, tid) != 0) {
remove_tid(sc, tid, ntids);
m = synqe->syn;
synqe->syn = NULL;
REJECT_PASS_ACCEPT_REQ(true);
}
INP_WLOCK(inp);
synqe->flags |= TPF_SYNQE_HAS_L2TE;
if (__predict_false(inp->inp_flags & INP_DROPPED)) {
/*
* Listening socket closed but tod_listen_stop did not abort
* this tid because there was no L2T entry for the tid at that
* time. Abort it now. The reply to the abort will clean up.
*/
CTR6(KTR_CXGBE,
"%s: stid %u, tid %u, lctx %p, synqe %p (0x%x), ABORT",
__func__, stid, tid, lctx, synqe, synqe->flags);
if (!(synqe->flags & TPF_SYNQE_EXPANDED))
send_reset_synqe(tod, synqe);
INP_WUNLOCK(inp);
CURVNET_RESTORE();
"%s: stid %u, tid %u, lctx %p, synqe %p, mode %d, SYNACK",
__func__, stid, tid, lctx, synqe, synqe->ulp_mode);
} else
REJECT_PASS_ACCEPT_REQ(false);
release_synqe(synqe); /* extra hold */
return (__LINE__);
}
INP_WUNLOCK(inp);
CURVNET_RESTORE();
release_synqe(synqe); /* extra hold */
return (0);
reject:
CURVNET_RESTORE();
@ -1521,8 +1443,19 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
if (e)
t4_l2t_release(e);
release_tid(sc, tid, lctx->ctrlq);
if (synqe) {
inp = synqe->lctx->inp;
INP_WLOCK(inp);
inp = release_synqe(sc, synqe);
if (inp)
INP_WUNLOCK(inp);
}
if (__predict_true(m != NULL)) {
if (m) {
/*
* The connection request hit a TOE listener but is being passed
* on to the kernel sw stack instead of getting offloaded.
*/
m_adj(m, sizeof(*cpl));
m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID |
CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
@ -1575,7 +1508,6 @@ do_pass_establish(struct sge_iq *iq, const struct rss_header *rss,
struct in_conninfo inc;
struct toepcb *toep;
struct epoch_tracker et;
u_int txqid, rxqid;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
@ -1595,72 +1527,45 @@ do_pass_establish(struct sge_iq *iq, const struct rss_header *rss,
"%s: stid %u, tid %u, synqe %p (0x%x), inp_flags 0x%x",
__func__, stid, tid, synqe, synqe->flags, inp->inp_flags);
if (__predict_false(inp->inp_flags & INP_DROPPED)) {
if (synqe->flags & TPF_SYNQE_HAS_L2TE) {
KASSERT(synqe->flags & TPF_ABORT_SHUTDOWN,
("%s: listen socket closed but tid %u not aborted.",
__func__, tid));
}
INP_WUNLOCK(inp);
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
CURVNET_RESTORE();
return (0);
}
ifp = synqe->syn->m_pkthdr.rcvif;
vi = ifp->if_softc;
KASSERT(vi->pi->adapter == sc,
("%s: vi %p, sc %p mismatch", __func__, vi, sc));
get_qids_from_mbuf(synqe->syn, &txqid, &rxqid);
KASSERT(rxqid == iq_to_ofld_rxq(iq) - &sc->sge.ofld_rxq[0],
("%s: CPL arrived on unexpected rxq. %d %d", __func__, rxqid,
(int)(iq_to_ofld_rxq(iq) - &sc->sge.ofld_rxq[0])));
toep = alloc_toepcb(vi, txqid, rxqid, M_NOWAIT);
if (toep == NULL) {
if (__predict_false(inp->inp_flags & INP_DROPPED)) {
reset:
/*
* The reply to this abort will perform final cleanup. There is
* no need to check for HAS_L2TE here. We can be here only if
* we responded to the PASS_ACCEPT_REQ, and our response had the
* L2T idx.
*/
send_reset_synqe(TOEDEV(ifp), synqe);
INP_WUNLOCK(inp);
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
CURVNET_RESTORE();
return (0);
}
KASSERT(synqe->rxqid == iq_to_ofld_rxq(iq) - &sc->sge.ofld_rxq[0],
("%s: CPL arrived on unexpected rxq. %d %d", __func__,
synqe->rxqid, (int)(iq_to_ofld_rxq(iq) - &sc->sge.ofld_rxq[0])));
toep = alloc_toepcb(vi, synqe->txqid, synqe->rxqid, M_NOWAIT);
if (toep == NULL)
goto reset;
toep->tid = tid;
toep->l2te = &sc->l2t->l2tab[synqe->l2e_idx];
if (synqe->flags & TPF_SYNQE_TCPDDP)
set_ulp_mode(toep, ULP_MODE_TCPDDP);
else if (synqe->flags & TPF_SYNQE_TLS)
set_ulp_mode(toep, ULP_MODE_TLS);
else
set_ulp_mode(toep, ULP_MODE_NONE);
toep->vnet = lctx->vnet;
set_ulp_mode(toep, synqe->ulp_mode);
/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
toep->rx_credits = synqe->rcv_bufsize;
so = inp->inp_socket;
KASSERT(so != NULL, ("%s: socket is NULL", __func__));
MPASS(be32toh(cpl->snd_isn) - 1 == synqe->iss);
MPASS(be32toh(cpl->rcv_isn) - 1 == synqe->irs);
synqe->tcp_opt = cpl->tcp_opt;
synqe->toep = toep;
/* Come up with something that syncache_expand should be ok with. */
synqe_to_protohdrs(sc, synqe, cpl, &inc, &th, &to);
/*
* No more need for anything in the mbuf that carried the
* CPL_PASS_ACCEPT_REQ. Drop the CPL_PASS_ESTABLISH and toep pointer
* there. XXX: bad form but I don't want to increase the size of synqe.
*/
m = synqe->syn;
KASSERT(sizeof(*cpl) + sizeof(toep) <= m->m_len,
("%s: no room in mbuf %p (m_len %d)", __func__, m, m->m_len));
bcopy(cpl, mtod(m, void *), sizeof(*cpl));
*(struct toepcb **)(mtod(m, struct cpl_pass_establish *) + 1) = toep;
if (inc.inc_flags & INC_ISIPV6)
toep->ce = t4_hold_lip(sc, &inc.inc6_laddr, lctx->ce);
so = inp->inp_socket;
KASSERT(so != NULL, ("%s: socket is NULL", __func__));
if (!toe_syncache_expand(&inc, &to, &th, &so) || so == NULL) {
free_toepcb(toep);
@ -1671,14 +1576,9 @@ do_pass_establish(struct sge_iq *iq, const struct rss_header *rss,
new_inp = sotoinpcb(so);
INP_WLOCK_ASSERT(new_inp);
MPASS(so->so_vnet == lctx->vnet);
toep->vnet = lctx->vnet;
if (inc.inc_flags & INC_ISIPV6)
toep->ce = t4_hold_lip(sc, &inc.inc6_laddr, lctx->ce);
/*
* This is for the unlikely case where the syncache entry that we added
* has been evicted from the syncache, but the syncache_expand above
* works because of syncookies.
* This is for expansion from syncookies.
*
* XXX: we've held the tcbinfo lock throughout so there's no risk of
* anyone accept'ing a connection before we've installed our hooks, but
@ -1692,13 +1592,11 @@ do_pass_establish(struct sge_iq *iq, const struct rss_header *rss,
INP_WUNLOCK(new_inp);
/* Done with the synqe */
TAILQ_REMOVE(&lctx->synq, synqe, link);
inp = release_lctx(sc, lctx);
inp = release_synqe(sc, synqe);
if (inp != NULL)
INP_WUNLOCK(inp);
INP_INFO_RUNLOCK_ET(&V_tcbinfo, et);
CURVNET_RESTORE();
release_synqe(synqe);
return (0);
}

12
sys/dev/cxgbe/tom/t4_tom.c
View File

@ -1020,9 +1020,9 @@ reclaim_wr_resources(void *arg, int count)
struct tom_data *td = arg;
STAILQ_HEAD(, wrqe) twr_list = STAILQ_HEAD_INITIALIZER(twr_list);
struct cpl_act_open_req *cpl;
u_int opcode, atid;
u_int opcode, atid, tid;
struct wrqe *wr;
struct adapter *sc;
struct adapter *sc = td_adapter(td);
mtx_lock(&td->unsent_wr_lock);
STAILQ_SWAP(&td->unsent_wr_list, &twr_list, wrqe);
@ -1038,12 +1038,16 @@ reclaim_wr_resources(void *arg, int count)
case CPL_ACT_OPEN_REQ:
case CPL_ACT_OPEN_REQ6:
atid = G_TID_TID(be32toh(OPCODE_TID(cpl)));
sc = td_adapter(td);
CTR2(KTR_CXGBE, "%s: atid %u ", __func__, atid);
act_open_failure_cleanup(sc, atid, EHOSTUNREACH);
free(wr, M_CXGBE);
break;
case CPL_PASS_ACCEPT_RPL:
tid = GET_TID(cpl);
CTR2(KTR_CXGBE, "%s: tid %u ", __func__, tid);
synack_failure_cleanup(sc, tid);
free(wr, M_CXGBE);
break;
default:
log(LOG_ERR, "%s: leaked work request %p, wr_len %d, "
"opcode %x\n", __func__, wr, wr->wr_len, opcode);

30
sys/dev/cxgbe/tom/t4_tom.h
View File

@ -68,12 +68,8 @@ enum {
TPF_ABORT_SHUTDOWN = (1 << 6), /* connection abort is in progress */
TPF_CPL_PENDING = (1 << 7), /* haven't received the last CPL */
TPF_SYNQE = (1 << 8), /* synq_entry, not really a toepcb */
TPF_SYNQE_NEEDFREE = (1 << 9), /* synq_entry was malloc'd separately */
TPF_SYNQE_TCPDDP = (1 << 10), /* ulp_mode TCPDDP in toepcb */
TPF_SYNQE_EXPANDED = (1 << 11), /* toepcb ready, tid context updated */
TPF_SYNQE_HAS_L2TE = (1 << 12), /* we've replied to PASS_ACCEPT_REQ */
TPF_SYNQE_TLS = (1 << 13), /* ulp_mode TLS in toepcb */
TPF_FORCE_CREDITS = (1 << 14), /* always send credits */
TPF_SYNQE_EXPANDED = (1 << 9), /* toepcb ready, tid context updated */
TPF_FORCE_CREDITS = (1 << 10), /* always send credits */
};
enum {
@ -225,21 +221,25 @@ struct flowc_tx_params {
#define DDP_HIGH_SCORE 3
/*
* Compressed state for embryonic connections for a listener. Barely fits in
* 64B, try not to grow it further.
* Compressed state for embryonic connections for a listener.
*/
struct synq_entry {
TAILQ_ENTRY(synq_entry) link; /* listen_ctx's synq link */
int flags; /* same as toepcb's tp_flags */
int tid;
struct listen_ctx *lctx; /* backpointer to listen ctx */
struct mbuf *syn;
uint32_t iss;
uint32_t ts;
volatile uintptr_t wr;
int flags; /* same as toepcb's tp_flags */
volatile int ok_to_respond;
volatile u_int refcnt;
int tid;
uint32_t iss;
uint32_t irs;
uint32_t ts;
uint16_t txqid;
uint16_t rxqid;
uint16_t l2e_idx;
uint16_t ulp_mode;
uint16_t rcv_bufsize;
__be16 tcp_opt; /* from cpl_pass_establish */
struct toepcb *toep;
};
/* listen_ctx flags */
@ -256,7 +256,6 @@ struct listen_ctx {
struct sge_wrq *ctrlq;
struct sge_ofld_rxq *ofld_rxq;
struct clip_entry *ce;
TAILQ_HEAD(, synq_entry) synq;
};
struct tom_data {
@ -352,6 +351,7 @@ int do_abort_req_synqe(struct sge_iq *, const struct rss_header *,
int do_abort_rpl_synqe(struct sge_iq *, const struct rss_header *,
struct mbuf *);
void t4_offload_socket(struct toedev *, void *, struct socket *);
void synack_failure_cleanup(struct adapter *, int);
/* t4_cpl_io.c */
void aiotx_init_toep(struct toepcb *);