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/*-
* 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: release/9.1.0/sys/dev/cxgbe/tom/t4_listen.c 237263 2012-06-19 07:34:13Z np $");
#include "opt_inet.h"
#ifdef TCP_OFFLOAD
#include <sys/param.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/module.h>
#include <sys/protosw.h>
#include <sys/refcount.h>
#include <sys/domain.h>
#include <sys/fnv_hash.h>
#include <sys/socket.h>
#include <sys/socketvar.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 <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#include <netinet/tcp_var.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/toecore.h>
#include "common/common.h"
#include "common/t4_msg.h"
#include "common/t4_regs.h"
#include "tom/t4_tom_l2t.h"
#include "tom/t4_tom.h"
/* stid services */
static int alloc_stid(struct adapter *, void *);
static void *lookup_stid(struct adapter *, int);
static void free_stid(struct adapter *, int);
/* lctx services */
static struct listen_ctx *alloc_lctx(struct adapter *, struct inpcb *,
struct port_info *);
static int free_lctx(struct adapter *, struct listen_ctx *);
static void hold_lctx(struct listen_ctx *);
static void listen_hash_add(struct adapter *, struct listen_ctx *);
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 port_info *);
static inline void get_qids_from_mbuf(struct mbuf *m, int *, int *);
static void send_reset_synqe(struct toedev *, struct synq_entry *);
/* XXX: won't work for IPv6 */
static int
alloc_stid(struct adapter *sc, void *ctx)
{
struct tid_info *t = &sc->tids;
int stid = -1;
mtx_lock(&t->stid_lock);
if (t->sfree) {
union serv_entry *p = t->sfree;
stid = p - t->stid_tab;
stid += t->stid_base;
t->sfree = p->next;
p->data = ctx;
t->stids_in_use++;
}
mtx_unlock(&t->stid_lock);
return (stid);
}
static void *
lookup_stid(struct adapter *sc, int stid)
{
struct tid_info *t = &sc->tids;
return (t->stid_tab[stid - t->stid_base].data);
}
static void
free_stid(struct adapter *sc, int stid)
{
struct tid_info *t = &sc->tids;
union serv_entry *p = &t->stid_tab[stid - t->stid_base];
mtx_lock(&t->stid_lock);
p->next = t->sfree;
t->sfree = p;
t->stids_in_use--;
mtx_unlock(&t->stid_lock);
}
static struct listen_ctx *
alloc_lctx(struct adapter *sc, struct inpcb *inp, struct port_info *pi)
{
struct listen_ctx *lctx;
INP_WLOCK_ASSERT(inp);
lctx = malloc(sizeof(struct listen_ctx), M_CXGBE, M_NOWAIT | M_ZERO);
if (lctx == NULL)
return (NULL);
lctx->stid = alloc_stid(sc, lctx);
if (lctx->stid < 0) {
free(lctx, M_CXGBE);
return (NULL);
}
lctx->ctrlq = &sc->sge.ctrlq[pi->port_id];
lctx->ofld_rxq = &sc->sge.ofld_rxq[pi->first_ofld_rxq];
refcount_init(&lctx->refcount, 1);
TAILQ_INIT(&lctx->synq);
lctx->inp = inp;
in_pcbref(inp);
return (lctx);
}
/* Don't call this directly, use release_lctx instead */
static int
free_lctx(struct adapter *sc, struct listen_ctx *lctx)
{
struct inpcb *inp = lctx->inp;
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",
__func__, lctx->stid, lctx, lctx->inp);
free_stid(sc, lctx->stid);
free(lctx, M_CXGBE);
return (in_pcbrele_wlocked(inp));
}
static void
hold_lctx(struct listen_ctx *lctx)
{
refcount_acquire(&lctx->refcount);
}
static inline uint32_t
listen_hashfn(void *key, u_long mask)
{
return (fnv_32_buf(&key, sizeof(key), FNV1_32_INIT) & mask);
}
/*
* Add a listen_ctx entry to the listen hash table.
*/
static void
listen_hash_add(struct adapter *sc, struct listen_ctx *lctx)
{
struct tom_data *td = sc->tom_softc;
int bucket = listen_hashfn(lctx->inp, td->listen_mask);
mtx_lock(&td->lctx_hash_lock);
LIST_INSERT_HEAD(&td->listen_hash[bucket], lctx, link);
td->lctx_count++;
mtx_unlock(&td->lctx_hash_lock);
}
/*
* Look for the listening socket's context entry in the hash and return it.
*/
static struct listen_ctx *
listen_hash_find(struct adapter *sc, struct inpcb *inp)
{
struct tom_data *td = sc->tom_softc;
int bucket = listen_hashfn(inp, td->listen_mask);
struct listen_ctx *lctx;
mtx_lock(&td->lctx_hash_lock);
LIST_FOREACH(lctx, &td->listen_hash[bucket], link) {
if (lctx->inp == inp)
break;
}
mtx_unlock(&td->lctx_hash_lock);
return (lctx);
}
/*
* Removes the listen_ctx structure for inp from the hash and returns it.
*/
static struct listen_ctx *
listen_hash_del(struct adapter *sc, struct inpcb *inp)
{
struct tom_data *td = sc->tom_softc;
int bucket = listen_hashfn(inp, td->listen_mask);
struct listen_ctx *lctx, *l;
mtx_lock(&td->lctx_hash_lock);
LIST_FOREACH_SAFE(lctx, &td->listen_hash[bucket], link, l) {
if (lctx->inp == inp) {
LIST_REMOVE(lctx, link);
td->lctx_count--;
break;
}
}
mtx_unlock(&td->lctx_hash_lock);
return (lctx);
}
/*
* Releases a hold on the lctx. Must be called with the listening socket's inp
* locked. The inp may be freed by this function and it returns NULL to
* indicate this.
*/
static struct inpcb *
release_lctx(struct adapter *sc, struct listen_ctx *lctx)
{
struct inpcb *inp = lctx->inp;
int inp_freed = 0;
INP_WLOCK_ASSERT(inp);
if (refcount_release(&lctx->refcount))
inp_freed = free_lctx(sc, lctx);
return (inp_freed ? NULL : inp);
}
static void
send_reset_synqe(struct toedev *tod, struct synq_entry *synqe)
{
struct adapter *sc = tod->tod_softc;
struct mbuf *m = synqe->syn;
struct ifnet *ifp = m->m_pkthdr.rcvif;
struct port_info *pi = ifp->if_softc;
struct l2t_entry *e = &sc->l2t->l2tab[synqe->l2e_idx];
struct wrqe *wr;
struct fw_flowc_wr *flowc;
struct cpl_abort_req *req;
int txqid, rxqid, flowclen;
struct sge_wrq *ofld_txq;
struct sge_ofld_rxq *ofld_rxq;
const int nparams = 4;
unsigned int pfvf = G_FW_VIID_PFN(pi->viid) << S_FW_VIID_PFN;
INP_WLOCK_ASSERT(synqe->lctx->inp);
CTR4(KTR_CXGBE, "%s: synqe %p, tid %d%s",
__func__, synqe, synqe->tid,
synqe_flag(synqe, TPF_ABORT_SHUTDOWN) ?
" (abort already in progress)" : "");
if (synqe_flag(synqe, TPF_ABORT_SHUTDOWN))
return; /* abort already in progress */
synqe_set_flag(synqe, TPF_ABORT_SHUTDOWN);
get_qids_from_mbuf(m, &txqid, &rxqid);
ofld_txq = &sc->sge.ofld_txq[txqid];
ofld_rxq = &sc->sge.ofld_rxq[rxqid];
/* The wrqe will have two WRs - a flowc followed by an abort_req */
flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval);
wr = alloc_wrqe(roundup(flowclen, EQ_ESIZE) + sizeof(*req), ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
flowc = wrtod(wr);
req = (void *)((caddr_t)flowc + roundup(flowclen, EQ_ESIZE));
/* First the flowc ... */
memset(flowc, 0, wr->wr_len);
flowc->op_to_nparams = htobe32(V_FW_WR_OP(FW_FLOWC_WR) |
V_FW_FLOWC_WR_NPARAMS(nparams));
flowc->flowid_len16 = htonl(V_FW_WR_LEN16(howmany(flowclen, 16)) |
V_FW_WR_FLOWID(synqe->tid));
flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
flowc->mnemval[0].val = htobe32(pfvf);
flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
flowc->mnemval[1].val = htobe32(pi->tx_chan);
flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
flowc->mnemval[2].val = htobe32(pi->tx_chan);
flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
flowc->mnemval[3].val = htobe32(ofld_rxq->iq.abs_id);
synqe_set_flag(synqe, TPF_FLOWC_WR_SENT);
/* ... then ABORT request */
INIT_TP_WR_MIT_CPL(req, CPL_ABORT_REQ, synqe->tid);
req->rsvd0 = 0; /* don't have a snd_nxt */
req->rsvd1 = 1; /* no data sent yet */
req->cmd = CPL_ABORT_SEND_RST;
t4_l2t_send(sc, wr, e);
}
static int
create_server(struct adapter *sc, struct listen_ctx *lctx)
{
struct wrqe *wr;
struct cpl_pass_open_req *req;
struct in_conninfo *inc = &lctx->inp->inp_inc;
wr = alloc_wrqe(sizeof(*req), lctx->ctrlq);
if (wr == NULL) {
log(LOG_ERR, "%s: allocation failure", __func__);
return (ENOMEM);
}
req = wrtod(wr);
INIT_TP_WR(req, 0);
OPCODE_TID(req) = htobe32(MK_OPCODE_TID(CPL_PASS_OPEN_REQ, lctx->stid));
req->local_port = inc->inc_lport;
req->peer_port = 0;
req->local_ip = inc->inc_laddr.s_addr;
req->peer_ip = 0;
req->opt0 = htobe64(V_TX_CHAN(lctx->ctrlq->eq.tx_chan));
req->opt1 = htobe64(V_CONN_POLICY(CPL_CONN_POLICY_ASK) |
F_SYN_RSS_ENABLE | V_SYN_RSS_QUEUE(lctx->ofld_rxq->iq.abs_id));
t4_wrq_tx(sc, wr);
return (0);
}
static int
destroy_server(struct adapter *sc, struct listen_ctx *lctx)
{
struct wrqe *wr;
struct cpl_close_listsvr_req *req;
wr = alloc_wrqe(sizeof(*req), lctx->ctrlq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
req = wrtod(wr);
INIT_TP_WR(req, 0);
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_LISTSRV_REQ,
lctx->stid));
req->reply_ctrl = htobe16(lctx->ofld_rxq->iq.abs_id);
req->rsvd = htobe16(0);
t4_wrq_tx(sc, wr);
return (0);
}
/*
* Start a listening server by sending a passive open request to HW.
*
* Can't take adapter lock here and access to sc->flags, sc->open_device_map,
* sc->offload_map, if_capenable are all race prone.
*/
int
t4_listen_start(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
struct port_info *pi;
struct inpcb *inp = tp->t_inpcb;
struct listen_ctx *lctx;
int i;
INP_WLOCK_ASSERT(inp);
if ((inp->inp_vflag & INP_IPV4) == 0)
return (0);
#if 0
ADAPTER_LOCK(sc);
if (IS_BUSY(sc)) {
log(LOG_ERR, "%s: listen request ignored, %s is busy",
__func__, device_get_nameunit(sc->dev));
goto done;
}
KASSERT(sc->flags & TOM_INIT_DONE,
("%s: TOM not initialized", __func__));
#endif
if ((sc->open_device_map & sc->offload_map) == 0)
goto done; /* no port that's UP with IFCAP_TOE enabled */
/*
* Find a running port with IFCAP_TOE4. We'll use the first such port's
* queues to send the passive open and receive the reply to it.
*
* XXX: need a way to mark a port in use by offload. if_cxgbe should
* then reject any attempt to bring down such a port (and maybe reject
* attempts to disable IFCAP_TOE on that port too?).
*/
for_each_port(sc, i) {
if (isset(&sc->open_device_map, i) &&
sc->port[i]->ifp->if_capenable & IFCAP_TOE4)
break;
}
KASSERT(i < sc->params.nports,
("%s: no running port with TOE capability enabled.", __func__));
pi = sc->port[i];
if (listen_hash_find(sc, inp) != NULL)
goto done; /* already setup */
lctx = alloc_lctx(sc, inp, pi);
if (lctx == NULL) {
log(LOG_ERR,
"%s: listen request ignored, %s couldn't allocate lctx\n",
__func__, device_get_nameunit(sc->dev));
goto done;
}
listen_hash_add(sc, lctx);
CTR5(KTR_CXGBE, "%s: stid %u (%s), lctx %p, inp %p", __func__,
lctx->stid, tcpstates[tp->t_state], lctx, inp);
if (create_server(sc, lctx) != 0) {
log(LOG_ERR, "%s: %s failed to create hw listener.\n", __func__,
device_get_nameunit(sc->dev));
(void) listen_hash_del(sc, inp);
inp = release_lctx(sc, lctx);
/* can't be freed, host stack has a reference */
KASSERT(inp != NULL, ("%s: inp freed", __func__));
goto done;
}
lctx->flags |= LCTX_RPL_PENDING;
done:
#if 0
ADAPTER_UNLOCK(sc);
#endif
return (0);
}
int
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);
lctx = listen_hash_del(sc, inp);
if (lctx == NULL)
return (ENOENT); /* no hardware listener for this inp */
CTR4(KTR_CXGBE, "%s: stid %u, lctx %p, flags %x", __func__, lctx->stid,
lctx, lctx->flags);
/*
* If the reply to the PASS_OPEN is still pending we'll wait for it to
* 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)
send_reset_synqe(tod, synqe);
destroy_server(sc, lctx);
return (0);
}
static inline void
hold_synqe(struct synq_entry *synqe)
{
refcount_acquire(&synqe->refcnt);
}
static inline void
release_synqe(struct synq_entry *synqe)
{
if (refcount_release(&synqe->refcnt)) {
int needfree = synqe_flag(synqe, TPF_SYNQE_NEEDFREE);
m_freem(synqe->syn);
if (needfree)
free(synqe, M_CXGBE);
}
}
void
t4_syncache_added(struct toedev *tod __unused, void *arg)
{
struct synq_entry *synqe = arg;
hold_synqe(synqe);
}
void
t4_syncache_removed(struct toedev *tod __unused, void *arg)
{
struct synq_entry *synqe = arg;
release_synqe(synqe);
}
/* XXX */
extern void tcp_dooptions(struct tcpopt *, u_char *, int, int);
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 = (void *)(ip + 1);
wr = (struct wrqe *)atomic_readandclear_ptr(&synqe->wr);
if (wr == NULL)
return (EALREADY);
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;
e = &sc->l2t->l2tab[synqe->l2e_idx];
t4_l2t_send(sc, wr, e);
m_freem(m); /* don't need this any more */
return (0);
}
static int
do_pass_open_rpl(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_pass_open_rpl *cpl = (const void *)(rss + 1);
int stid = GET_TID(cpl);
unsigned int status = cpl->status;
struct listen_ctx *lctx = lookup_stid(sc, stid);
struct inpcb *inp = lctx->inp;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_PASS_OPEN_RPL,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(lctx->stid == stid, ("%s: lctx stid mismatch", __func__));
INP_WLOCK(inp);
CTR4(KTR_CXGBE, "%s: stid %d, status %u, flags 0x%x",
__func__, stid, status, lctx->flags);
lctx->flags &= ~LCTX_RPL_PENDING;
if (status != CPL_ERR_NONE)
log(LOG_ERR, "listener with stid %u failed: %d", stid, status);
#ifdef INVARIANTS
/*
* If the inp has been dropped (listening socket closed) then
* listen_stop must have run and taken the inp out of the hash.
*/
if (inp->inp_flags & INP_DROPPED) {
KASSERT(listen_hash_del(sc, inp) == NULL,
("%s: inp %p still in listen hash", __func__, inp));
}
#endif
if (inp->inp_flags & INP_DROPPED && status != CPL_ERR_NONE) {
if (release_lctx(sc, lctx) != NULL)
INP_WUNLOCK(inp);
return (status);
}
/*
* Listening socket stopped listening earlier and now the chip tells us
* it has started the hardware listener. Stop it; the lctx will be
* released in do_close_server_rpl.
*/
if (inp->inp_flags & INP_DROPPED) {
destroy_server(sc, lctx);
INP_WUNLOCK(inp);
return (status);
}
/*
* Failed to start hardware listener. Take inp out of the hash and
* release our reference on it. An error message has been logged
* already.
*/
if (status != CPL_ERR_NONE) {
listen_hash_del(sc, inp);
if (release_lctx(sc, lctx) != NULL)
INP_WUNLOCK(inp);
return (status);
}
/* hardware listener open for business */
INP_WUNLOCK(inp);
return (status);
}
static int
do_close_server_rpl(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_close_listsvr_rpl *cpl = (const void *)(rss + 1);
int stid = GET_TID(cpl);
unsigned int status = cpl->status;
struct listen_ctx *lctx = lookup_stid(sc, stid);
struct inpcb *inp = lctx->inp;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_CLOSE_LISTSRV_RPL,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(lctx->stid == stid, ("%s: lctx stid mismatch", __func__));
CTR3(KTR_CXGBE, "%s: stid %u, status %u", __func__, stid, status);
if (status != CPL_ERR_NONE) {
log(LOG_ERR, "%s: failed (%u) to close listener for stid %u",
__func__, status, stid);
return (status);
}
INP_WLOCK(inp);
inp = release_lctx(sc, lctx);
if (inp != NULL)
INP_WUNLOCK(inp);
return (status);
}
static void
done_with_synqe(struct adapter *sc, struct synq_entry *synqe)
{
struct listen_ctx *lctx = synqe->lctx;
struct inpcb *inp = lctx->inp;
struct port_info *pi = synqe->syn->m_pkthdr.rcvif->if_softc;
struct l2t_entry *e = &sc->l2t->l2tab[synqe->l2e_idx];
INP_WLOCK_ASSERT(inp);
TAILQ_REMOVE(&lctx->synq, synqe, link);
inp = release_lctx(sc, lctx);
if (inp)
INP_WUNLOCK(inp);
remove_tid(sc, synqe->tid);
release_tid(sc, synqe->tid, &sc->sge.ctrlq[pi->port_id]);
t4_l2t_release(e);
release_synqe(synqe); /* removed from synq list */
}
int
do_abort_req_synqe(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_abort_req_rss *cpl = (const void *)(rss + 1);
unsigned int tid = GET_TID(cpl);
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)));
#endif
KASSERT(opcode == CPL_ABORT_REQ_RSS,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(synqe->tid == tid, ("%s: toep tid mismatch", __func__));
CTR6(KTR_CXGBE, "%s: tid %u, synqe %p (0x%x), lctx %p, status %d",
__func__, tid, synqe, synqe->flags, synqe->lctx, cpl->status);
if (cpl->status == CPL_ERR_RTX_NEG_ADVICE ||
cpl->status == CPL_ERR_PERSIST_NEG_ADVICE)
return (0); /* Ignore negative advice */
INP_WLOCK(inp);
get_qids_from_mbuf(synqe->syn, &txqid, NULL);
ofld_txq = &sc->sge.ofld_txq[txqid];
/*
* If we'd initiated an abort earlier the reply to it is responsible for
* cleaning up resources. Otherwise we tear everything down right here
* right now. We owe the T4 a CPL_ABORT_RPL no matter what.
*/
if (synqe_flag(synqe, TPF_ABORT_SHUTDOWN)) {
INP_WUNLOCK(inp);
goto done;
}
done_with_synqe(sc, synqe);
/* inp lock released by done_with_synqe */
done:
send_abort_rpl(sc, ofld_txq, tid, CPL_ABORT_NO_RST);
return (0);
}
int
do_abort_rpl_synqe(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_abort_rpl_rss *cpl = (const void *)(rss + 1);
unsigned int tid = GET_TID(cpl);
struct synq_entry *synqe = lookup_tid(sc, tid);
struct listen_ctx *lctx = synqe->lctx;
struct inpcb *inp = lctx->inp;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_ABORT_RPL_RSS,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(synqe->tid == tid, ("%s: toep tid mismatch", __func__));
CTR6(KTR_CXGBE, "%s: tid %u, synqe %p (0x%x), lctx %p, status %d",
__func__, tid, synqe, synqe->flags, synqe->lctx, cpl->status);
INP_WLOCK(inp);
KASSERT(synqe_flag(synqe, TPF_ABORT_SHUTDOWN),
("%s: wasn't expecting abort reply for synqe %p (0x%x)",
__func__, synqe, synqe->flags));
done_with_synqe(sc, synqe);
/* inp lock released by done_with_synqe */
return (0);
}
void
t4_offload_socket(struct toedev *tod, void *arg, struct socket *so)
{
struct adapter *sc = tod->tod_softc;
struct synq_entry *synqe = arg;
#ifdef INVARIANTS
struct inpcb *inp = sotoinpcb(so);
#endif
struct cpl_pass_establish *cpl = mtod(synqe->syn, void *);
struct toepcb *toep = *(struct toepcb **)(cpl + 1);
INP_INFO_LOCK_ASSERT(&V_tcbinfo); /* prevents bad race with accept() */
INP_WLOCK_ASSERT(inp);
KASSERT(synqe_flag(synqe, TPF_SYNQE),
("%s: %p not a synq_entry?", __func__, arg));
offload_socket(so, toep);
make_established(toep, cpl->snd_isn, cpl->rcv_isn, cpl->tcp_opt);
toepcb_set_flag(toep, TPF_CPL_PENDING);
update_tid(sc, synqe->tid, toep);
}
static inline void
save_qids_in_mbuf(struct mbuf *m, struct port_info *pi)
{
uint32_t txqid, rxqid;
txqid = (arc4random() % pi->nofldtxq) + pi->first_ofld_txq;
rxqid = (arc4random() % pi->nofldrxq) + pi->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 = roundup(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);
} else
synqe = (void *)(m->m_data + m->m_len + tspace - sizeof(*synqe));
synqe->flags = 0;
synqe_set_flag(synqe, TPF_SYNQE);
if (tspace < len)
synqe_set_flag(synqe, TPF_SYNQE_NEEDFREE);
return (synqe);
}
static void
t4opt_to_tcpopt(const struct tcp_options *t4opt, struct tcpopt *to)
{
bzero(to, sizeof(*to));
if (t4opt->mss) {
to->to_flags |= TOF_MSS;
to->to_mss = be16toh(t4opt->mss);
}
if (t4opt->wsf) {
to->to_flags |= TOF_SCALE;
to->to_wscale = t4opt->wsf;
}
if (t4opt->tstamp)
to->to_flags |= TOF_TS;
if (t4opt->sack)
to->to_flags |= TOF_SACKPERM;
}
/*
* Options2 for passive open.
*/
static uint32_t
calc_opt2p(struct adapter *sc, struct port_info *pi, int rxqid,
const struct tcp_options *tcpopt, struct tcphdr *th)
{
uint32_t opt2 = 0;
struct sge_ofld_rxq *ofld_rxq = &sc->sge.ofld_rxq[rxqid];
if (V_tcp_do_rfc1323) {
if (tcpopt->tstamp)
opt2 |= F_TSTAMPS_EN;
if (tcpopt->sack)
opt2 |= F_SACK_EN;
if (tcpopt->wsf > 0)
opt2 |= F_WND_SCALE_EN;
}
if (V_tcp_do_ecn && th->th_flags & (TH_ECE | TH_CWR))
opt2 |= F_CCTRL_ECN;
opt2 |= V_TX_QUEUE(sc->params.tp.tx_modq[pi->tx_chan]);
opt2 |= F_RX_COALESCE_VALID | V_RX_COALESCE(M_RX_COALESCE);
opt2 |= F_RSS_QUEUE_VALID | V_RSS_QUEUE(ofld_rxq->iq.abs_id);
return htobe32(opt2);
}
/* XXX: duplication. */
static inline void
tcp_fields_to_host(struct tcphdr *th)
{
th->th_seq = ntohl(th->th_seq);
th->th_ack = ntohl(th->th_ack);
th->th_win = ntohs(th->th_win);
th->th_urp = ntohs(th->th_urp);
}
static void
pass_accept_req_to_protohdrs(const struct mbuf *m, struct in_conninfo *inc,
struct tcphdr *th)
{
const struct cpl_pass_accept_req *cpl = mtod(m, const void *);
const struct ether_header *eh;
unsigned int hlen = be32toh(cpl->hdr_len);
const struct ip *ip;
const struct tcphdr *tcp;
eh = (const void *)(cpl + 1);
ip = (const void *)((uintptr_t)eh + G_ETH_HDR_LEN(hlen));
tcp = (const void *)((uintptr_t)ip + G_IP_HDR_LEN(hlen));
if (inc) {
bzero(inc, sizeof(*inc));
inc->inc_faddr = ip->ip_src;
inc->inc_laddr = ip->ip_dst;
inc->inc_fport = tcp->th_sport;
inc->inc_lport = tcp->th_dport;
if (ip->ip_v == 6)
inc->inc_flags |= INC_ISIPV6;
}
if (th) {
bcopy(tcp, th, sizeof(*th));
tcp_fields_to_host(th); /* just like tcp_input */
}
}
#define REJECT_PASS_ACCEPT() do { \
reject_reason = __LINE__; \
goto reject; \
} while (0)
/*
* The context associated with a tid entry via insert_tid could be a synq_entry
* or a toepcb. The only way CPL handlers can tell is via a bit in these flags.
*/
CTASSERT(offsetof(struct toepcb, flags) == offsetof(struct synq_entry, flags));
/*
* Incoming SYN on a listening socket.
*
* XXX: Every use of ifp in this routine has a bad race with up/down, toe/-toe,
* etc.
*/
static int
do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
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);
struct inpcb *inp;
struct socket *so;
struct in_conninfo inc;
struct tcphdr th;
struct tcpopt to;
struct port_info *pi;
struct ifnet *ifp, *ifp_vlan = NULL;
struct l2t_entry *e = NULL;
struct rtentry *rt;
struct sockaddr_in nam;
int rscale, mtu_idx, rx_credits, rxqid;
struct synq_entry *synqe = NULL;
int reject_reason;
uint16_t vid;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_PASS_ACCEPT_REQ,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(lctx->stid == stid, ("%s: lctx stid mismatch", __func__));
CTR4(KTR_CXGBE, "%s: stid %u, tid %u, lctx %p", __func__, stid, tid,
lctx);
pass_accept_req_to_protohdrs(m, &inc, &th);
t4opt_to_tcpopt(&cpl->tcpopt, &to);
pi = sc->port[G_SYN_INTF(be16toh(cpl->l2info))];
ifp = pi->ifp;
m->m_pkthdr.rcvif = ifp;
tod = TOEDEV(ifp);
/*
* Don't offload if the interface that received the SYN doesn't have
* IFCAP_TOE enabled.
*/
if ((ifp->if_capenable & IFCAP_TOE4) == 0)
REJECT_PASS_ACCEPT();
/* Don't offload IPv6 connections. XXX: add IPv6 support */
if (inc.inc_flags & INC_ISIPV6)
REJECT_PASS_ACCEPT();
/*
* Don't offload if the SYN had a VLAN tag and the vid doesn't match
* anything on this interface.
*/
vid = EVL_VLANOFTAG(be16toh(cpl->vlan));
if (vid != 0xfff) {
ifp_vlan = VLAN_DEVAT(ifp, vid);
if (ifp_vlan == NULL)
REJECT_PASS_ACCEPT();
}
/*
* Don't offload if the peer requested a TCP option that's not known to
* the silicon.
*/
if (cpl->tcpopt.unknown)
REJECT_PASS_ACCEPT();
/*
* Don't offload if the outgoing interface for the route back to the
* peer is not the same as the interface that received the SYN.
* XXX: too restrictive.
*/
nam.sin_len = sizeof(nam);
nam.sin_family = AF_INET;
nam.sin_addr = inc.inc_faddr;
rt = rtalloc1((struct sockaddr *)&nam, 0, 0);
if (rt == NULL)
REJECT_PASS_ACCEPT();
else {
struct sockaddr *nexthop;
RT_UNLOCK(rt);
nexthop = rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway :
(struct sockaddr *)&nam;
if (rt->rt_ifp == ifp ||
(ifp_vlan != NULL && rt->rt_ifp == ifp_vlan))
e = t4_l2t_get(pi, rt->rt_ifp, nexthop);
RTFREE(rt);
if (e == NULL)
REJECT_PASS_ACCEPT(); /* no l2te, or ifp mismatch */
}
synqe = mbuf_to_synqe(m);
if (synqe == NULL)
REJECT_PASS_ACCEPT();
wr = alloc_wrqe(sizeof(*rpl), &sc->sge.ctrlq[pi->port_id]);
if (wr == NULL)
REJECT_PASS_ACCEPT();
rpl = wrtod(wr);
INP_INFO_WLOCK(&V_tcbinfo); /* for 4-tuple check, syncache_add */
/* Don't offload if the 4-tuple is already in use */
if (toe_4tuple_check(&inc, &th, ifp) != 0) {
INP_INFO_WUNLOCK(&V_tcbinfo);
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
}
inp = lctx->inp; /* listening socket, not owned by TOE */
INP_WLOCK(inp);
/* 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);
INP_INFO_WUNLOCK(&V_tcbinfo);
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
}
so = inp->inp_socket;
mtu_idx = find_best_mtu_idx(sc, &inc, be16toh(cpl->tcpopt.mss));
rscale = cpl->tcpopt.wsf && V_tcp_do_rfc1323 ? select_rcv_wscale() : 0;
SOCKBUF_LOCK(&so->so_rcv);
/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
SOCKBUF_UNLOCK(&so->so_rcv);
save_qids_in_mbuf(m, pi);
get_qids_from_mbuf(m, NULL, &rxqid);
INIT_TP_WR_MIT_CPL(rpl, CPL_PASS_ACCEPT_RPL, tid);
rpl->opt0 = calc_opt0(so, pi, e, mtu_idx, rscale, rx_credits,
ULP_MODE_NONE);
rpl->opt2 = calc_opt2p(sc, pi, rxqid, &cpl->tcpopt, &th);
synqe->tid = tid;
synqe->lctx = lctx;
synqe->syn = m;
m = NULL;
refcount_init(&synqe->refcnt, 1); /* 1 so that it is held for the
duration of this function */
synqe->l2e_idx = e->idx;
synqe->rcv_bufsize = rx_credits;
atomic_store_rel_ptr(&synqe->wr, (uintptr_t)wr);
insert_tid(sc, tid, synqe);
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 */
/*
* If all goes well t4_syncache_respond will get called during
* syncache_add. Also note that syncache_add releases both pcbinfo and
* pcb locks.
*/
toe_syncache_add(&inc, &to, &th, inp, tod, synqe);
INP_UNLOCK_ASSERT(inp); /* ok to assert, we have a ref on the inp */
INP_INFO_UNLOCK_ASSERT(&V_tcbinfo);
/*
* 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.
*
* The extra hold on the synqe makes sure that it is still around, even
* if the listener has been dropped and the synqe was aborted and the
* reply to the abort has removed and released the synqe from the synq
* list.
*/
if (atomic_cmpset_ptr(&synqe->wr, (uintptr_t)wr, 0)) {
INP_WLOCK(inp);
if (__predict_false(inp->inp_flags & INP_DROPPED)) {
/* listener closed. synqe must have been aborted. */
KASSERT(synqe_flag(synqe, TPF_ABORT_SHUTDOWN),
("%s: listener %p closed but synqe %p not aborted",
__func__, inp, synqe));
CTR5(KTR_CXGBE,
"%s: stid %u, tid %u, lctx %p, synqe %p, ABORTED",
__func__, stid, tid, lctx, synqe);
INP_WUNLOCK(inp);
free(wr, M_CXGBE);
release_synqe(synqe); /* about to exit function */
return (__LINE__);
}
/*
* synqe aborted before TOM replied to PASS_ACCEPT_REQ. But
* that can only happen if the listener was closed and we just
* checked for that.
*/
KASSERT(!synqe_flag(synqe, TPF_ABORT_SHUTDOWN),
("%s: synqe %p aborted, but listener %p not dropped.",
__func__, synqe, inp));
/* Yank the synqe out of the lctx synq. */
TAILQ_REMOVE(&lctx->synq, synqe, link);
release_synqe(synqe); /* removed from synq list */
inp = release_lctx(sc, lctx);
if (inp)
INP_WUNLOCK(inp);
/*
* 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_DONTWAIT);
if (m)
m->m_pkthdr.rcvif = ifp;
release_synqe(synqe); /* about to exit function */
free(wr, M_CXGBE);
REJECT_PASS_ACCEPT();
}
release_synqe(synqe); /* about to exit function */
CTR5(KTR_CXGBE, "%s: stid %u, tid %u, lctx %p, synqe %p, SYNACK",
__func__, stid, tid, lctx, synqe);
return (0);
reject:
CTR4(KTR_CXGBE, "%s: stid %u, tid %u, REJECT (%d)", __func__, stid, tid,
reject_reason);
if (e)
t4_l2t_release(e);
release_tid(sc, tid, lctx->ctrlq);
if (__predict_true(m != NULL)) {
m_adj(m, sizeof(*cpl));
m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID |
CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
m->m_pkthdr.csum_data = 0xffff;
ifp->if_input(ifp, m);
}
return (reject_reason);
}
static void
synqe_to_protohdrs(struct synq_entry *synqe,
const struct cpl_pass_establish *cpl, struct in_conninfo *inc,
struct tcphdr *th, struct tcpopt *to)
{
uint16_t tcp_opt = be16toh(cpl->tcp_opt);
/* start off with the original SYN */
pass_accept_req_to_protohdrs(synqe->syn, inc, th);
/* modify parts to make it look like the ACK to our SYN|ACK */
th->th_flags = TH_ACK;
th->th_ack = synqe->iss + 1;
th->th_seq = be32toh(cpl->rcv_isn);
bzero(to, sizeof(*to));
if (G_TCPOPT_TSTAMP(tcp_opt)) {
to->to_flags |= TOF_TS;
to->to_tsecr = synqe->ts;
}
}
static int
do_pass_establish(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
struct port_info *pi;
struct ifnet *ifp;
const struct cpl_pass_establish *cpl = (const void *)(rss + 1);
#if defined(KTR) || defined(INVARIANTS)
unsigned int stid = G_PASS_OPEN_TID(be32toh(cpl->tos_stid));
#endif
unsigned int tid = GET_TID(cpl);
struct synq_entry *synqe = lookup_tid(sc, tid);
struct listen_ctx *lctx = synqe->lctx;
struct inpcb *inp = lctx->inp;
struct socket *so;
struct tcphdr th;
struct tcpopt to;
struct in_conninfo inc;
struct toepcb *toep;
u_int txqid, rxqid;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_PASS_ESTABLISH,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(lctx->stid == stid, ("%s: lctx stid mismatch", __func__));
KASSERT(synqe_flag(synqe, TPF_SYNQE),
("%s: tid %u (ctx %p) not a synqe", __func__, tid, synqe));
INP_INFO_WLOCK(&V_tcbinfo); /* for syncache_expand */
INP_WLOCK(inp);
CTR6(KTR_CXGBE,
"%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)) {
/*
* The listening socket has closed. The TOM must have aborted
* all the embryonic connections (including this one) that were
* on the lctx's synq. do_abort_rpl for the tid is responsible
* for cleaning up.
*/
KASSERT(synqe_flag(synqe, TPF_ABORT_SHUTDOWN),
("%s: listen socket dropped but tid %u not aborted.",
__func__, tid));
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
return (0);
}
ifp = synqe->syn->m_pkthdr.rcvif;
pi = ifp->if_softc;
KASSERT(pi->adapter == sc,
("%s: pi %p, sc %p mismatch", __func__, pi, 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(pi, txqid, rxqid, M_NOWAIT);
if (toep == NULL) {
reset:
/* The reply to this abort will perform final cleanup */
send_reset_synqe(TOEDEV(ifp), synqe);
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
return (0);
}
toep->tid = tid;
toep->l2te = &sc->l2t->l2tab[synqe->l2e_idx];
toep->ulp_mode = ULP_MODE_NONE;
/* 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__));
/* Come up with something that syncache_expand should be ok with. */
synqe_to_protohdrs(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 (!toe_syncache_expand(&inc, &to, &th, &so) || so == NULL) {
free_toepcb(toep);
goto reset;
}
/* Done with the synqe */
TAILQ_REMOVE(&lctx->synq, synqe, link);
inp = release_lctx(sc, lctx);
if (inp != NULL)
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
release_synqe(synqe);
return (0);
}
void
t4_init_listen_cpl_handlers(struct adapter *sc)
{
t4_register_cpl_handler(sc, CPL_PASS_OPEN_RPL, do_pass_open_rpl);
t4_register_cpl_handler(sc, CPL_CLOSE_LISTSRV_RPL, do_close_server_rpl);
t4_register_cpl_handler(sc, CPL_PASS_ACCEPT_REQ, do_pass_accept_req);
t4_register_cpl_handler(sc, CPL_PASS_ESTABLISH, do_pass_establish);
}
#endif