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/*-
* Copyright (c) 2012 Chelsio Communications, Inc.
* All rights reserved.
*
* 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/cxgb/ulp/tom/cxgb_cpl_io.c 237920 2012-07-01 12:00:36Z np $");
#include "opt_inet.h"
#ifdef TCP_OFFLOAD
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/sockstate.h>
#include <sys/sockopt.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockbuf.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/protosw.h>
#include <sys/priv.h>
#include <sys/sglist.h>
#include <sys/taskqueue.h>
#include <net/if.h>
#include <net/ethernet.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/tcp_var.h>
#define TCPSTATES
#include <netinet/tcp_fsm.h>
#include <netinet/toecore.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <net/route.h>
#include "cxgb_include.h"
#include "ulp/tom/cxgb_l2t.h"
#include "ulp/tom/cxgb_tom.h"
#include "ulp/tom/cxgb_toepcb.h"
VNET_DECLARE(int, tcp_do_autosndbuf);
#define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
VNET_DECLARE(int, tcp_autosndbuf_inc);
#define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
VNET_DECLARE(int, tcp_autosndbuf_max);
#define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
VNET_DECLARE(int, tcp_do_autorcvbuf);
#define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
VNET_DECLARE(int, tcp_autorcvbuf_inc);
#define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc)
VNET_DECLARE(int, tcp_autorcvbuf_max);
#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
extern int always_keepalive;
/*
* For ULP connections HW may add headers, e.g., for digests, that aren't part
* of the messages sent by the host but that are part of the TCP payload and
* therefore consume TCP sequence space. Tx connection parameters that
* operate in TCP sequence space are affected by the HW additions and need to
* compensate for them to accurately track TCP sequence numbers. This array
* contains the compensating extra lengths for ULP packets. It is indexed by
* a packet's ULP submode.
*/
const unsigned int t3_ulp_extra_len[] = {0, 4, 4, 8};
/*
* Max receive window supported by HW in bytes. Only a small part of it can
* be set through option0, the rest needs to be set through RX_DATA_ACK.
*/
#define MAX_RCV_WND ((1U << 27) - 1)
/*
* Min receive window. We want it to be large enough to accommodate receive
* coalescing, handle jumbo frames, and not trigger sender SWS avoidance.
*/
#define MIN_RCV_WND (24 * 1024U)
#define INP_TOS(inp) ((inp_ip_tos_get(inp) >> 2) & M_TOS)
static void t3_release_offload_resources(struct toepcb *);
static void send_reset(struct toepcb *toep);
/*
* Called after the last CPL for the toepcb has been received.
*
* The inp must be wlocked on entry and is unlocked (or maybe destroyed) by the
* time this function exits.
*/
static int
toepcb_release(struct toepcb *toep)
{
struct inpcb *inp = toep->tp_inp;
struct toedev *tod = toep->tp_tod;
struct tom_data *td = t3_tomdata(tod);
int rc;
INP_WLOCK_ASSERT(inp);
KASSERT(!(toep->tp_flags & TP_CPL_DONE),
("%s: double release?", __func__));
CTR2(KTR_CXGB, "%s: tid %d", __func__, toep->tp_tid);
toep->tp_flags |= TP_CPL_DONE;
toep->tp_inp = NULL;
mtx_lock(&td->toep_list_lock);
TAILQ_REMOVE(&td->toep_list, toep, link);
mtx_unlock(&td->toep_list_lock);
if (!(toep->tp_flags & TP_ATTACHED))
t3_release_offload_resources(toep);
rc = in_pcbrele_wlocked(inp);
if (!rc)
INP_WUNLOCK(inp);
return (rc);
}
/*
* One sided detach. The tcpcb is going away and we need to unhook the toepcb
* hanging off it. If the TOE driver is also done with the toepcb we'll release
* all offload resources.
*/
static void
toepcb_detach(struct inpcb *inp)
{
struct toepcb *toep;
struct tcpcb *tp;
KASSERT(inp, ("%s: inp is NULL", __func__));
INP_WLOCK_ASSERT(inp);
tp = intotcpcb(inp);
toep = tp->t_toe;
KASSERT(toep != NULL, ("%s: toep is NULL", __func__));
KASSERT(toep->tp_flags & TP_ATTACHED, ("%s: not attached", __func__));
CTR6(KTR_CXGB, "%s: %s %u, toep %p, inp %p, tp %p", __func__,
tp->t_state == TCPS_SYN_SENT ? "atid" : "tid", toep->tp_tid,
toep, inp, tp);
tp->t_toe = NULL;
tp->t_flags &= ~TF_TOE;
toep->tp_flags &= ~TP_ATTACHED;
if (toep->tp_flags & TP_CPL_DONE)
t3_release_offload_resources(toep);
}
void
t3_pcb_detach(struct toedev *tod __unused, struct tcpcb *tp)
{
toepcb_detach(tp->t_inpcb);
}
static int
alloc_atid(struct tid_info *t, void *ctx)
{
int atid = -1;
mtx_lock(&t->atid_lock);
if (t->afree) {
union active_open_entry *p = t->afree;
atid = (p - t->atid_tab) + t->atid_base;
t->afree = p->next;
p->ctx = ctx;
t->atids_in_use++;
}
mtx_unlock(&t->atid_lock);
return (atid);
}
static void
free_atid(struct tid_info *t, int atid)
{
union active_open_entry *p = atid2entry(t, atid);
mtx_lock(&t->atid_lock);
p->next = t->afree;
t->afree = p;
t->atids_in_use--;
mtx_unlock(&t->atid_lock);
}
void
insert_tid(struct tom_data *td, void *ctx, unsigned int tid)
{
struct tid_info *t = &td->tid_maps;
t->tid_tab[tid] = ctx;
atomic_add_int(&t->tids_in_use, 1);
}
void
update_tid(struct tom_data *td, void *ctx, unsigned int tid)
{
struct tid_info *t = &td->tid_maps;
t->tid_tab[tid] = ctx;
}
void
remove_tid(struct tom_data *td, unsigned int tid)
{
struct tid_info *t = &td->tid_maps;
t->tid_tab[tid] = NULL;
atomic_add_int(&t->tids_in_use, -1);
}
/* use ctx as a next pointer in the tid release list */
void
queue_tid_release(struct toedev *tod, unsigned int tid)
{
struct tom_data *td = t3_tomdata(tod);
void **p = &td->tid_maps.tid_tab[tid];
struct adapter *sc = tod->tod_softc;
mtx_lock(&td->tid_release_lock);
*p = td->tid_release_list;
td->tid_release_list = p;
if (!*p)
taskqueue_enqueue(sc->tq, &td->tid_release_task);
mtx_unlock(&td->tid_release_lock);
}
/*
* Populate a TID_RELEASE WR.
*/
static inline void
mk_tid_release(struct cpl_tid_release *cpl, unsigned int tid)
{
cpl->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
OPCODE_TID(cpl) = htonl(MK_OPCODE_TID(CPL_TID_RELEASE, tid));
}
void
release_tid(struct toedev *tod, unsigned int tid, int qset)
{
struct tom_data *td = t3_tomdata(tod);
struct adapter *sc = tod->tod_softc;
struct mbuf *m;
struct cpl_tid_release *cpl;
#ifdef INVARIANTS
struct tid_info *t = &td->tid_maps;
#endif
KASSERT(tid >= 0 && tid < t->ntids,
("%s: tid=%d, ntids=%d", __func__, tid, t->ntids));
m = M_GETHDR_OFLD(qset, CPL_PRIORITY_CONTROL, cpl);
if (m) {
mk_tid_release(cpl, tid);
t3_offload_tx(sc, m);
remove_tid(td, tid);
} else
queue_tid_release(tod, tid);
}
void
t3_process_tid_release_list(void *data, int pending)
{
struct mbuf *m;
struct tom_data *td = data;
struct adapter *sc = td->tod.tod_softc;
mtx_lock(&td->tid_release_lock);
while (td->tid_release_list) {
void **p = td->tid_release_list;
unsigned int tid = p - td->tid_maps.tid_tab;
struct cpl_tid_release *cpl;
td->tid_release_list = (void **)*p;
m = M_GETHDR_OFLD(0, CPL_PRIORITY_CONTROL, cpl); /* qs 0 here */
if (m == NULL)
break; /* XXX: who reschedules the release task? */
mtx_unlock(&td->tid_release_lock);
mk_tid_release(cpl, tid);
t3_offload_tx(sc, m);
remove_tid(td, tid);
mtx_lock(&td->tid_release_lock);
}
mtx_unlock(&td->tid_release_lock);
}
static void
close_conn(struct adapter *sc, struct toepcb *toep)
{
struct mbuf *m;
struct cpl_close_con_req *req;
if (toep->tp_flags & TP_FIN_SENT)
return;
m = M_GETHDR_OFLD(toep->tp_qset, CPL_PRIORITY_DATA, req);
if (m == NULL)
CXGB_UNIMPLEMENTED();
req->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
req->wr.wrh_lo = htonl(V_WR_TID(toep->tp_tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, toep->tp_tid));
req->rsvd = 0;
toep->tp_flags |= TP_FIN_SENT;
t3_offload_tx(sc, m);
}
static inline void
make_tx_data_wr(struct socket *so, struct tx_data_wr *req, int len,
struct mbuf *tail)
{
struct tcpcb *tp = so_sototcpcb(so);
struct toepcb *toep = tp->t_toe;
struct sockbuf *snd;
inp_lock_assert(tp->t_inpcb);
snd = so_sockbuf_snd(so);
req->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA));
req->wr.wrh_lo = htonl(V_WR_TID(toep->tp_tid));
/* len includes the length of any HW ULP additions */
req->len = htonl(len);
req->param = htonl(V_TX_PORT(toep->tp_l2t->smt_idx));
/* V_TX_ULP_SUBMODE sets both the mode and submode */
req->flags = htonl(V_TX_ULP_SUBMODE(toep->tp_ulp_mode) | V_TX_URG(0) |
V_TX_SHOVE(!(tp->t_flags & TF_MORETOCOME) && (tail ? 0 : 1)));
req->sndseq = htonl(tp->snd_nxt);
if (__predict_false((toep->tp_flags & TP_DATASENT) == 0)) {
struct adapter *sc = toep->tp_tod->tod_softc;
int cpu_idx = sc->rrss_map[toep->tp_qset];
req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
V_TX_CPU_IDX(cpu_idx));
/* Sendbuffer is in units of 32KB. */
if (V_tcp_do_autosndbuf && snd->sb_flags & SB_AUTOSIZE)
req->param |= htonl(V_TX_SNDBUF(VNET(tcp_autosndbuf_max) >> 15));
else
req->param |= htonl(V_TX_SNDBUF(snd->sb_hiwat >> 15));
toep->tp_flags |= TP_DATASENT;
}
}
/*
* TOM_XXX_DUPLICATION sgl_len, calc_tx_descs, calc_tx_descs_ofld, mbuf_wrs, etc.
* TOM_XXX_MOVE to some common header file.
*/
/*
* IMM_LEN: # of bytes that can be tx'd as immediate data. There are 16 flits
* in a tx desc; subtract 3 for tx_data_wr (including the WR header), and 1 more
* for the second gen bit flit. This leaves us with 12 flits.
*
* descs_to_sgllen: # of SGL entries that can fit into the given # of tx descs.
* The first desc has a tx_data_wr (which includes the WR header), the rest have
* the WR header only. All descs have the second gen bit flit.
*
* sgllen_to_descs: # of tx descs used up by an sgl of given length. The first
* desc has a tx_data_wr (which includes the WR header), the rest have the WR
* header only. All descs have the second gen bit flit.
*
* flits_to_sgllen: # of SGL entries that can be fit in the given # of flits.
*
*/
#define IMM_LEN 96
static int descs_to_sgllen[TX_MAX_DESC + 1] = {0, 8, 17, 26, 35};
static int sgllen_to_descs[TX_MAX_SEGS] = {
0, 1, 1, 1, 1, 1, 1, 1, 1, 2, /* 0 - 9 */
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, /* 10 - 19 */
3, 3, 3, 3, 3, 3, 3, 4, 4, 4, /* 20 - 29 */
4, 4, 4, 4, 4, 4 /* 30 - 35 */
};
#if 0
static int flits_to_sgllen[TX_DESC_FLITS + 1] = {
0, 0, 1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10
};
#endif
#if SGE_NUM_GENBITS != 2
#error "SGE_NUM_GENBITS really must be 2"
#endif
int
t3_push_frames(struct socket *so, int req_completion)
{
struct tcpcb *tp = so_sototcpcb(so);
struct toepcb *toep = tp->t_toe;
struct mbuf *m0, *sndptr, *m;
struct toedev *tod = toep->tp_tod;
struct adapter *sc = tod->tod_softc;
int bytes, ndesc, total_bytes = 0, mlen;
struct sockbuf *snd;
struct sglist *sgl;
struct ofld_hdr *oh;
caddr_t dst;
struct tx_data_wr *wr;
inp_lock_assert(tp->t_inpcb);
snd = so_sockbuf_snd(so);
SOCKBUF_LOCK(snd);
/*
* Autosize the send buffer.
*/
if (snd->sb_flags & SB_AUTOSIZE && VNET(tcp_do_autosndbuf)) {
if (snd->sb_cc >= (snd->sb_hiwat / 8 * 7) &&
snd->sb_cc < VNET(tcp_autosndbuf_max)) {
if (!sbreserve_locked(snd, min(snd->sb_hiwat +
VNET(tcp_autosndbuf_inc), VNET(tcp_autosndbuf_max)),
so, curthread))
snd->sb_flags &= ~SB_AUTOSIZE;
}
}
if (toep->tp_m_last && toep->tp_m_last == snd->sb_sndptr)
sndptr = toep->tp_m_last->m_next;
else
sndptr = snd->sb_sndptr ? snd->sb_sndptr : snd->sb_mb;
/* Nothing to send or no WRs available for sending data */
if (toep->tp_wr_avail == 0 || sndptr == NULL)
goto out;
/* Something to send and at least 1 WR available */
while (toep->tp_wr_avail && sndptr != NULL) {
m0 = m_gethdr(M_NOWAIT, MT_DATA);
if (m0 == NULL)
break;
oh = mtod(m0, struct ofld_hdr *);
wr = (void *)(oh + 1);
dst = (void *)(wr + 1);
m0->m_pkthdr.len = m0->m_len = sizeof(*oh) + sizeof(*wr);
oh->flags = V_HDR_CTRL(CPL_PRIORITY_DATA) | F_HDR_DF |
V_HDR_QSET(toep->tp_qset);
/*
* Try to construct an immediate data WR if possible. Stuff as
* much data into it as possible, one whole mbuf at a time.
*/
mlen = sndptr->m_len;
ndesc = bytes = 0;
while (mlen <= IMM_LEN - bytes) {
bcopy(sndptr->m_data, dst, mlen);
bytes += mlen;
dst += mlen;
if (!(sndptr = sndptr->m_next))
break;
mlen = sndptr->m_len;
}
if (bytes) {
/* Was able to fit 'bytes' bytes in an immediate WR */
ndesc = 1;
make_tx_data_wr(so, wr, bytes, sndptr);
m0->m_len += bytes;
m0->m_pkthdr.len = m0->m_len;
} else {
int wr_avail = min(toep->tp_wr_avail, TX_MAX_DESC);
/* Need to make an SGL */
sgl = sglist_alloc(descs_to_sgllen[wr_avail], M_NOWAIT);
if (sgl == NULL)
break;
for (m = sndptr; m != NULL; m = m->m_next) {
if ((mlen = m->m_len) > 0) {
if (sglist_append(sgl, m->m_data, mlen))
break;
}
bytes += mlen;
}
sndptr = m;
if (bytes == 0) {
sglist_free(sgl);
break;
}
ndesc = sgllen_to_descs[sgl->sg_nseg];
oh->flags |= F_HDR_SGL;
oh->sgl = sgl;
make_tx_data_wr(so, wr, bytes, sndptr);
}
oh->flags |= V_HDR_NDESC(ndesc);
oh->plen = bytes;
snd->sb_sndptr = sndptr;
snd->sb_sndptroff += bytes;
if (sndptr == NULL) {
snd->sb_sndptr = snd->sb_mbtail;
snd->sb_sndptroff -= snd->sb_mbtail->m_len;
toep->tp_m_last = snd->sb_mbtail;
} else
toep->tp_m_last = NULL;
total_bytes += bytes;
toep->tp_wr_avail -= ndesc;
toep->tp_wr_unacked += ndesc;
if ((req_completion && toep->tp_wr_unacked == ndesc) ||
toep->tp_wr_unacked >= toep->tp_wr_max / 2) {
wr->wr.wrh_hi |= htonl(F_WR_COMPL);
toep->tp_wr_unacked = 0;
}
enqueue_wr(toep, m0);
l2t_send(sc, m0, toep->tp_l2t);
}
out:
SOCKBUF_UNLOCK(snd);
if (sndptr == NULL && (toep->tp_flags & TP_SEND_FIN))
close_conn(sc, toep);
return (total_bytes);
}
static int
send_rx_credits(struct adapter *sc, struct toepcb *toep, int credits)
{
struct mbuf *m;
struct cpl_rx_data_ack *req;
uint32_t dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
m = M_GETHDR_OFLD(toep->tp_qset, CPL_PRIORITY_CONTROL, req);
if (m == NULL)
return (0);
req->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
req->wr.wrh_lo = 0;
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, toep->tp_tid));
req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
t3_offload_tx(sc, m);
return (credits);
}
void
t3_rcvd(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
struct sockbuf *so_rcv = &so->so_rcv;
struct toepcb *toep = tp->t_toe;
int must_send;
INP_WLOCK_ASSERT(inp);
SOCKBUF_LOCK(so_rcv);
KASSERT(toep->tp_enqueued >= so_rcv->sb_cc,
("%s: so_rcv->sb_cc > enqueued", __func__));
toep->tp_rx_credits += toep->tp_enqueued - so_rcv->sb_cc;
toep->tp_enqueued = so_rcv->sb_cc;
SOCKBUF_UNLOCK(so_rcv);
must_send = toep->tp_rx_credits + 16384 >= tp->rcv_wnd;
if (must_send || toep->tp_rx_credits >= 15 * 1024) {
int credits;
credits = send_rx_credits(sc, toep, toep->tp_rx_credits);
toep->tp_rx_credits -= credits;
tp->rcv_wnd += credits;
tp->rcv_adv += credits;
}
}
static int
do_rx_urg_notify(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct cpl_rx_urg_notify *hdr = mtod(m, void *);
unsigned int tid = GET_TID(hdr);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
log(LOG_ERR, "%s: tid %u inp %p", __func__, tid, toep->tp_inp);
m_freem(m);
return (0);
}
int
t3_send_fin(struct toedev *tod, struct tcpcb *tp)
{
struct toepcb *toep = tp->t_toe;
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp_inpcbtosocket(inp);
#if defined(KTR)
unsigned int tid = toep->tp_tid;
#endif
INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
INP_WLOCK_ASSERT(inp);
CTR4(KTR_CXGB, "%s: tid %d, toep %p, flags %x", __func__, tid, toep,
toep->tp_flags);
toep->tp_flags |= TP_SEND_FIN;
t3_push_frames(so, 1);
return (0);
}
int
t3_tod_output(struct toedev *tod, struct tcpcb *tp)
{
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
t3_push_frames(so, 1);
return (0);
}
/* What mtu_idx to use, given a 4-tuple and/or an MSS cap */
int
find_best_mtu_idx(struct adapter *sc, struct in_conninfo *inc, int pmss)
{
unsigned short *mtus = &sc->params.mtus[0];
int i = 0, mss;
KASSERT(inc != NULL || pmss > 0,
("%s: at least one of inc/pmss must be specified", __func__));
mss = inc ? tcp_mssopt(inc) : pmss;
if (pmss > 0 && mss > pmss)
mss = pmss;
while (i < NMTUS - 1 && mtus[i + 1] <= mss + 40)
++i;
return (i);
}
static inline void
purge_wr_queue(struct toepcb *toep)
{
struct mbuf *m;
struct ofld_hdr *oh;
while ((m = mbufq_dequeue(&toep->wr_list)) != NULL) {
oh = mtod(m, struct ofld_hdr *);
if (oh->flags & F_HDR_SGL)
sglist_free(oh->sgl);
m_freem(m);
}
}
/*
* Release cxgb(4) and T3 resources held by an offload connection (TID, L2T
* entry, etc.)
*/
static void
t3_release_offload_resources(struct toepcb *toep)
{
struct toedev *tod = toep->tp_tod;
struct tom_data *td = t3_tomdata(tod);
/*
* The TOM explicitly detaches its toepcb from the system's inp before
* it releases the offload resources.
*/
if (toep->tp_inp) {
panic("%s: inp %p still attached to toepcb %p",
__func__, toep->tp_inp, toep);
}
if (toep->tp_wr_avail != toep->tp_wr_max)
purge_wr_queue(toep);
if (toep->tp_l2t) {
l2t_release(td->l2t, toep->tp_l2t);
toep->tp_l2t = NULL;
}
if (toep->tp_tid >= 0)
release_tid(tod, toep->tp_tid, toep->tp_qset);
toepcb_free(toep);
}
/*
* Determine the receive window size for a socket.
*/
unsigned long
select_rcv_wnd(struct socket *so)
{
unsigned long wnd;
SOCKBUF_LOCK_ASSERT(&so->so_rcv);
wnd = sbspace(&so->so_rcv);
if (wnd < MIN_RCV_WND)
wnd = MIN_RCV_WND;
return min(wnd, MAX_RCV_WND);
}
int
select_rcv_wscale(void)
{
int wscale = 0;
unsigned long space = sb_max;
if (space > MAX_RCV_WND)
space = MAX_RCV_WND;
while (wscale < TCP_MAX_WINSHIFT && (TCP_MAXWIN << wscale) < space)
wscale++;
return (wscale);
}
/*
* Set up the socket for TCP offload.
*/
void
offload_socket(struct socket *so, struct toepcb *toep)
{
struct toedev *tod = toep->tp_tod;
struct tom_data *td = t3_tomdata(tod);
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = intotcpcb(inp);
INP_WLOCK_ASSERT(inp);
/* Update socket */
SOCKBUF_LOCK(&so->so_snd);
so_sockbuf_snd(so)->sb_flags |= SB_NOCOALESCE;
SOCKBUF_UNLOCK(&so->so_snd);
SOCKBUF_LOCK(&so->so_rcv);
so_sockbuf_rcv(so)->sb_flags |= SB_NOCOALESCE;
SOCKBUF_UNLOCK(&so->so_rcv);
/* Update TCP PCB */
tp->tod = toep->tp_tod;
tp->t_toe = toep;
tp->t_flags |= TF_TOE;
/* Install an extra hold on inp */
toep->tp_inp = inp;
toep->tp_flags |= TP_ATTACHED;
in_pcbref(inp);
/* Add the TOE PCB to the active list */
mtx_lock(&td->toep_list_lock);
TAILQ_INSERT_HEAD(&td->toep_list, toep, link);
mtx_unlock(&td->toep_list_lock);
}
/* This is _not_ the normal way to "unoffload" a socket. */
void
undo_offload_socket(struct socket *so)
{
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = intotcpcb(inp);
struct toepcb *toep = tp->t_toe;
struct toedev *tod = toep->tp_tod;
struct tom_data *td = t3_tomdata(tod);
INP_WLOCK_ASSERT(inp);
so_sockbuf_snd(so)->sb_flags &= ~SB_NOCOALESCE;
so_sockbuf_rcv(so)->sb_flags &= ~SB_NOCOALESCE;
tp->tod = NULL;
tp->t_toe = NULL;
tp->t_flags &= ~TF_TOE;
toep->tp_inp = NULL;
toep->tp_flags &= ~TP_ATTACHED;
if (in_pcbrele_wlocked(inp))
panic("%s: inp freed.", __func__);
mtx_lock(&td->toep_list_lock);
TAILQ_REMOVE(&td->toep_list, toep, link);
mtx_unlock(&td->toep_list_lock);
}
/*
* Socket could be a listening socket, and we may not have a toepcb at all at
* this time.
*/
uint32_t
calc_opt0h(struct socket *so, int mtu_idx, int rscale, struct l2t_entry *e)
{
uint32_t opt0h = F_TCAM_BYPASS | V_WND_SCALE(rscale) |
V_MSS_IDX(mtu_idx);
if (so != NULL) {
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = intotcpcb(inp);
int keepalive = always_keepalive ||
so_options_get(so) & SO_KEEPALIVE;
opt0h |= V_NAGLE((tp->t_flags & TF_NODELAY) == 0);
opt0h |= V_KEEP_ALIVE(keepalive != 0);
}
if (e != NULL)
opt0h |= V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx);
return (htobe32(opt0h));
}
uint32_t
calc_opt0l(struct socket *so, int rcv_bufsize)
{
uint32_t opt0l = V_ULP_MODE(ULP_MODE_NONE) | V_RCV_BUFSIZ(rcv_bufsize);
KASSERT(rcv_bufsize <= M_RCV_BUFSIZ,
("%s: rcv_bufsize (%d) is too high", __func__, rcv_bufsize));
if (so != NULL) /* optional because noone cares about IP TOS */
opt0l |= V_TOS(INP_TOS(sotoinpcb(so)));
return (htobe32(opt0l));
}
/*
* Convert an ACT_OPEN_RPL status to an errno.
*/
static int
act_open_rpl_status_to_errno(int status)
{
switch (status) {
case CPL_ERR_CONN_RESET:
return (ECONNREFUSED);
case CPL_ERR_ARP_MISS:
return (EHOSTUNREACH);
case CPL_ERR_CONN_TIMEDOUT:
return (ETIMEDOUT);
case CPL_ERR_TCAM_FULL:
return (ENOMEM);
case CPL_ERR_CONN_EXIST:
log(LOG_ERR, "ACTIVE_OPEN_RPL: 4-tuple in use\n");
return (EADDRINUSE);
default:
return (EIO);
}
}
/*
* Return whether a failed active open has allocated a TID
*/
static inline int
act_open_has_tid(int status)
{
return status != CPL_ERR_TCAM_FULL && status != CPL_ERR_CONN_EXIST &&
status != CPL_ERR_ARP_MISS;
}
/*
* Active open failed.
*/
static int
do_act_open_rpl(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct toedev *tod = &td->tod;
struct cpl_act_open_rpl *rpl = mtod(m, void *);
unsigned int atid = G_TID(ntohl(rpl->atid));
struct toepcb *toep = lookup_atid(&td->tid_maps, atid);
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp = intotcpcb(inp);
int s = rpl->status;
CTR3(KTR_CXGB, "%s: atid %u, status %u ", __func__, atid, s);
free_atid(&td->tid_maps, atid);
toep->tp_tid = -1;
if (act_open_has_tid(s))
queue_tid_release(tod, GET_TID(rpl));
if (s == CPL_ERR_TCAM_FULL || s == CPL_ERR_CONN_EXIST) {
INP_WLOCK(inp);
toe_connect_failed(tod, tp, EAGAIN);
toepcb_release(toep); /* unlocks inp */
} else {
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
toe_connect_failed(tod, tp, act_open_rpl_status_to_errno(s));
toepcb_release(toep); /* unlocks inp */
INP_INFO_WUNLOCK(&V_tcbinfo);
}
m_freem(m);
return (0);
}
/*
* Send an active open request.
*
* 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
t3_connect(struct toedev *tod, struct socket *so,
struct rtentry *rt, struct sockaddr *nam)
{
struct mbuf *m = NULL;
struct l2t_entry *e = NULL;
struct tom_data *td = t3_tomdata(tod);
struct adapter *sc = tod->tod_softc;
struct cpl_act_open_req *cpl;
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = intotcpcb(inp);
struct toepcb *toep;
int atid = -1, mtu_idx, rscale, cpu_idx, qset;
struct sockaddr *gw;
struct ifnet *ifp = rt->rt_ifp;
struct port_info *pi = ifp->if_softc; /* XXX wrong for VLAN etc. */
INP_WLOCK_ASSERT(inp);
toep = toepcb_alloc(tod);
if (toep == NULL)
goto failed;
atid = alloc_atid(&td->tid_maps, toep);
if (atid < 0)
goto failed;
qset = pi->first_qset + (arc4random() % pi->nqsets);
m = M_GETHDR_OFLD(qset, CPL_PRIORITY_CONTROL, cpl);
if (m == NULL)
goto failed;
gw = rt->rt_flags & RTF_GATEWAY ? rt->rt_gateway : nam;
e = t3_l2t_get(pi, ifp, gw);
if (e == NULL)
goto failed;
toep->tp_l2t = e;
toep->tp_tid = atid; /* used to double check response */
toep->tp_qset = qset;
SOCKBUF_LOCK(&so->so_rcv);
/* opt0 rcv_bufsiz initially, assumes its normal meaning later */
toep->tp_rx_credits = min(select_rcv_wnd(so) >> 10, M_RCV_BUFSIZ);
SOCKBUF_UNLOCK(&so->so_rcv);
offload_socket(so, toep);
/*
* The kernel sets request_r_scale based on sb_max whereas we need to
* take hardware's MAX_RCV_WND into account too. This is normally a
* no-op as MAX_RCV_WND is much larger than the default sb_max.
*/
if (tp->t_flags & TF_REQ_SCALE)
rscale = tp->request_r_scale = select_rcv_wscale();
else
rscale = 0;
mtu_idx = find_best_mtu_idx(sc, &inp->inp_inc, 0);
cpu_idx = sc->rrss_map[qset];
cpl->wr.wrh_hi = htobe32(V_WR_OP(FW_WROPCODE_FORWARD));
cpl->wr.wrh_lo = 0;
OPCODE_TID(cpl) = htobe32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
inp_4tuple_get(inp, &cpl->local_ip, &cpl->local_port, &cpl->peer_ip,
&cpl->peer_port);
cpl->opt0h = calc_opt0h(so, mtu_idx, rscale, e);
cpl->opt0l = calc_opt0l(so, toep->tp_rx_credits);
cpl->params = 0;
cpl->opt2 = calc_opt2(cpu_idx);
CTR5(KTR_CXGB, "%s: atid %u (%s), toep %p, inp %p", __func__,
toep->tp_tid, tcpstates[tp->t_state], toep, inp);
if (l2t_send(sc, m, e) == 0)
return (0);
undo_offload_socket(so);
failed:
CTR5(KTR_CXGB, "%s: FAILED, atid %d, toep %p, l2te %p, mbuf %p",
__func__, atid, toep, e, m);
if (atid >= 0)
free_atid(&td->tid_maps, atid);
if (e)
l2t_release(td->l2t, e);
if (toep)
toepcb_free(toep);
m_freem(m);
return (ENOMEM);
}
/*
* Send an ABORT_REQ message. Cannot fail. This routine makes sure we do not
* send multiple ABORT_REQs for the same connection and also that we do not try
* to send a message after the connection has closed.
*/
static void
send_reset(struct toepcb *toep)
{
struct cpl_abort_req *req;
unsigned int tid = toep->tp_tid;
struct inpcb *inp = toep->tp_inp;
struct socket *so = inp->inp_socket;
struct tcpcb *tp = intotcpcb(inp);
struct toedev *tod = toep->tp_tod;
struct adapter *sc = tod->tod_softc;
struct mbuf *m;
INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
INP_WLOCK_ASSERT(inp);
CTR4(KTR_CXGB, "%s: tid %d, toep %p (%x)", __func__, tid, toep,
toep->tp_flags);
if (toep->tp_flags & TP_ABORT_SHUTDOWN)
return;
toep->tp_flags |= (TP_ABORT_RPL_PENDING | TP_ABORT_SHUTDOWN);
/* Purge the send queue */
sbflush(so_sockbuf_snd(so));
purge_wr_queue(toep);
m = M_GETHDR_OFLD(toep->tp_qset, CPL_PRIORITY_DATA, req);
if (m == NULL)
CXGB_UNIMPLEMENTED();
req->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
req->wr.wrh_lo = htonl(V_WR_TID(tid));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
req->rsvd0 = htonl(tp->snd_nxt);
req->rsvd1 = !(toep->tp_flags & TP_DATASENT);
req->cmd = CPL_ABORT_SEND_RST;
if (tp->t_state == TCPS_SYN_SENT)
mbufq_tail(&toep->out_of_order_queue, m); /* defer */
else
l2t_send(sc, m, toep->tp_l2t);
}
int
t3_send_rst(struct toedev *tod __unused, struct tcpcb *tp)
{
send_reset(tp->t_toe);
return (0);
}
/*
* Handler for RX_DATA CPL messages.
*/
static int
do_rx_data(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct cpl_rx_data *hdr = mtod(m, void *);
unsigned int tid = GET_TID(hdr);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp;
struct socket *so;
struct sockbuf *so_rcv;
/* Advance over CPL */
m_adj(m, sizeof(*hdr));
/* XXX: revisit. This comes from the T4 TOM */
if (__predict_false(inp == NULL)) {
/*
* do_pass_establish failed and must be attempting to abort the
* connection. Meanwhile, the T4 has sent us data for such a
* connection.
*/
#ifdef notyet
KASSERT(toepcb_flag(toep, TPF_ABORT_SHUTDOWN),
("%s: inp NULL and tid isn't being aborted", __func__));
#endif
m_freem(m);
return (0);
}
INP_WLOCK(inp);
if (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) {
CTR4(KTR_CXGB, "%s: tid %u, rx (%d bytes), inp_flags 0x%x",
__func__, tid, m->m_pkthdr.len, inp->inp_flags);
INP_WUNLOCK(inp);
m_freem(m);
return (0);
}
if (__predict_false(hdr->dack_mode != toep->tp_delack_mode))
toep->tp_delack_mode = hdr->dack_mode;
tp = intotcpcb(inp);
#ifdef INVARIANTS
if (__predict_false(tp->rcv_nxt != be32toh(hdr->seq))) {
log(LOG_ERR,
"%s: unexpected seq# %x for TID %u, rcv_nxt %x\n",
__func__, be32toh(hdr->seq), toep->tp_tid, tp->rcv_nxt);
}
#endif
tp->rcv_nxt += m->m_pkthdr.len;
KASSERT(tp->rcv_wnd >= m->m_pkthdr.len,
("%s: negative window size", __func__));
tp->rcv_wnd -= m->m_pkthdr.len;
tp->t_rcvtime = ticks;
so = inp->inp_socket;
so_rcv = &so->so_rcv;
SOCKBUF_LOCK(so_rcv);
if (__predict_false(so_rcv->sb_state & SBS_CANTRCVMORE)) {
CTR3(KTR_CXGB, "%s: tid %u, excess rx (%d bytes)",
__func__, tid, m->m_pkthdr.len);
SOCKBUF_UNLOCK(so_rcv);
INP_WUNLOCK(inp);
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
tp = tcp_drop(tp, ECONNRESET);
if (tp)
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
m_freem(m);
return (0);
}
/* receive buffer autosize */
if (so_rcv->sb_flags & SB_AUTOSIZE &&
V_tcp_do_autorcvbuf &&
so_rcv->sb_hiwat < V_tcp_autorcvbuf_max &&
(m->m_pkthdr.len > (sbspace(so_rcv) / 8 * 7) || tp->rcv_wnd < 32768)) {
unsigned int hiwat = so_rcv->sb_hiwat;
unsigned int newsize = min(hiwat + V_tcp_autorcvbuf_inc,
V_tcp_autorcvbuf_max);
if (!sbreserve_locked(so_rcv, newsize, so, NULL))
so_rcv->sb_flags &= ~SB_AUTOSIZE;
else
toep->tp_rx_credits += newsize - hiwat;
}
toep->tp_enqueued += m->m_pkthdr.len;
sbappendstream_locked(so_rcv, m);
sorwakeup_locked(so);
SOCKBUF_UNLOCK_ASSERT(so_rcv);
INP_WUNLOCK(inp);
return (0);
}
/*
* Handler for PEER_CLOSE CPL messages.
*/
static int
do_peer_close(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
const struct cpl_peer_close *hdr = mtod(m, void *);
unsigned int tid = GET_TID(hdr);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp;
struct socket *so;
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
tp = intotcpcb(inp);
CTR5(KTR_CXGB, "%s: tid %u (%s), toep_flags 0x%x, inp %p", __func__,
tid, tp ? tcpstates[tp->t_state] : "no tp" , toep->tp_flags, inp);
if (toep->tp_flags & TP_ABORT_RPL_PENDING)
goto done;
so = inp_inpcbtosocket(inp);
socantrcvmore(so);
tp->rcv_nxt++;
switch (tp->t_state) {
case TCPS_SYN_RECEIVED:
tp->t_starttime = ticks;
/* FALLTHROUGH */
case TCPS_ESTABLISHED:
tp->t_state = TCPS_CLOSE_WAIT;
break;
case TCPS_FIN_WAIT_1:
tp->t_state = TCPS_CLOSING;
break;
case TCPS_FIN_WAIT_2:
tcp_twstart(tp);
INP_UNLOCK_ASSERT(inp); /* safe, we have a ref on the inp */
INP_INFO_WUNLOCK(&V_tcbinfo);
INP_WLOCK(inp);
toepcb_release(toep); /* no more CPLs expected */
m_freem(m);
return (0);
default:
log(LOG_ERR, "%s: TID %u received PEER_CLOSE in bad state %d\n",
__func__, toep->tp_tid, tp->t_state);
}
done:
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
m_freem(m);
return (0);
}
/*
* Handler for CLOSE_CON_RPL CPL messages. peer ACK to our FIN received.
*/
static int
do_close_con_rpl(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
const struct cpl_close_con_rpl *rpl = mtod(m, void *);
unsigned int tid = GET_TID(rpl);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp;
struct socket *so;
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
tp = intotcpcb(inp);
CTR4(KTR_CXGB, "%s: tid %u (%s), toep_flags 0x%x", __func__, tid,
tp ? tcpstates[tp->t_state] : "no tp", toep->tp_flags);
if ((toep->tp_flags & TP_ABORT_RPL_PENDING))
goto done;
so = inp_inpcbtosocket(inp);
tp->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
switch (tp->t_state) {
case TCPS_CLOSING:
tcp_twstart(tp);
release:
INP_UNLOCK_ASSERT(inp); /* safe, we have a ref on the inp */
INP_INFO_WUNLOCK(&V_tcbinfo);
INP_WLOCK(inp);
toepcb_release(toep); /* no more CPLs expected */
m_freem(m);
return (0);
case TCPS_LAST_ACK:
if (tcp_close(tp))
INP_WUNLOCK(inp);
goto release;
case TCPS_FIN_WAIT_1:
if (so->so_rcv.sb_state & SBS_CANTRCVMORE)
soisdisconnected(so);
tp->t_state = TCPS_FIN_WAIT_2;
break;
default:
log(LOG_ERR,
"%s: TID %u received CLOSE_CON_RPL in bad state %d\n",
__func__, toep->tp_tid, tp->t_state);
}
done:
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
m_freem(m);
return (0);
}
static int
do_smt_write_rpl(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct cpl_smt_write_rpl *rpl = mtod(m, void *);
if (rpl->status != CPL_ERR_NONE) {
log(LOG_ERR,
"Unexpected SMT_WRITE_RPL status %u for entry %u\n",
rpl->status, GET_TID(rpl));
}
m_freem(m);
return (0);
}
static int
do_set_tcb_rpl(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct cpl_set_tcb_rpl *rpl = mtod(m, void *);
if (rpl->status != CPL_ERR_NONE) {
log(LOG_ERR, "Unexpected SET_TCB_RPL status %u for tid %u\n",
rpl->status, GET_TID(rpl));
}
m_freem(m);
return (0);
}
/*
* Handle an ABORT_RPL_RSS CPL message.
*/
static int
do_abort_rpl(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
const struct cpl_abort_rpl_rss *rpl = mtod(m, void *);
unsigned int tid = GET_TID(rpl);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
struct inpcb *inp;
/*
* Ignore replies to post-close aborts indicating that the abort was
* requested too late. These connections are terminated when we get
* PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
* arrives the TID is either no longer used or it has been recycled.
*/
if (rpl->status == CPL_ERR_ABORT_FAILED) {
m_freem(m);
return (0);
}
if (toep->tp_flags & TP_IS_A_SYNQ_ENTRY)
return (do_abort_rpl_synqe(qs, r, m));
CTR4(KTR_CXGB, "%s: tid %d, toep %p, status %d", __func__, tid, toep,
rpl->status);
inp = toep->tp_inp;
INP_WLOCK(inp);
if (toep->tp_flags & TP_ABORT_RPL_PENDING) {
if (!(toep->tp_flags & TP_ABORT_RPL_RCVD)) {
toep->tp_flags |= TP_ABORT_RPL_RCVD;
INP_WUNLOCK(inp);
} else {
toep->tp_flags &= ~TP_ABORT_RPL_RCVD;
toep->tp_flags &= TP_ABORT_RPL_PENDING;
toepcb_release(toep); /* no more CPLs expected */
}
}
m_freem(m);
return (0);
}
/*
* Convert the status code of an ABORT_REQ into a FreeBSD error code.
*/
static int
abort_status_to_errno(struct tcpcb *tp, int abort_reason)
{
switch (abort_reason) {
case CPL_ERR_BAD_SYN:
case CPL_ERR_CONN_RESET:
return (tp->t_state == TCPS_CLOSE_WAIT ? EPIPE : ECONNRESET);
case CPL_ERR_XMIT_TIMEDOUT:
case CPL_ERR_PERSIST_TIMEDOUT:
case CPL_ERR_FINWAIT2_TIMEDOUT:
case CPL_ERR_KEEPALIVE_TIMEDOUT:
return (ETIMEDOUT);
default:
return (EIO);
}
}
/*
* Returns whether an ABORT_REQ_RSS message is a negative advice.
*/
static inline int
is_neg_adv_abort(unsigned int status)
{
return status == CPL_ERR_RTX_NEG_ADVICE ||
status == CPL_ERR_PERSIST_NEG_ADVICE;
}
void
send_abort_rpl(struct toedev *tod, int tid, int qset)
{
struct mbuf *reply;
struct cpl_abort_rpl *rpl;
struct adapter *sc = tod->tod_softc;
reply = M_GETHDR_OFLD(qset, CPL_PRIORITY_DATA, rpl);
if (!reply)
CXGB_UNIMPLEMENTED();
rpl->wr.wrh_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
rpl->wr.wrh_lo = htonl(V_WR_TID(tid));
OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, tid));
rpl->cmd = CPL_ABORT_NO_RST;
t3_offload_tx(sc, reply);
}
/*
* Handle an ABORT_REQ_RSS CPL message. If we're waiting for an ABORT_RPL we
* ignore this request except that we need to reply to it.
*/
static int
do_abort_req(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct toedev *tod = &td->tod;
const struct cpl_abort_req_rss *req = mtod(m, void *);
unsigned int tid = GET_TID(req);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
struct inpcb *inp;
struct tcpcb *tp;
struct socket *so;
int qset = toep->tp_qset;
if (is_neg_adv_abort(req->status)) {
CTR4(KTR_CXGB, "%s: negative advice %d for tid %u (%x)",
__func__, req->status, tid, toep->tp_flags);
m_freem(m);
return (0);
}
if (toep->tp_flags & TP_IS_A_SYNQ_ENTRY)
return (do_abort_req_synqe(qs, r, m));
inp = toep->tp_inp;
INP_INFO_WLOCK(&V_tcbinfo); /* for tcp_close */
INP_WLOCK(inp);
tp = intotcpcb(inp);
so = inp->inp_socket;
CTR6(KTR_CXGB, "%s: tid %u (%s), toep %p (%x), status %d",
__func__, tid, tcpstates[tp->t_state], toep, toep->tp_flags,
req->status);
if (!(toep->tp_flags & TP_ABORT_REQ_RCVD)) {
toep->tp_flags |= TP_ABORT_REQ_RCVD;
toep->tp_flags |= TP_ABORT_SHUTDOWN;
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
m_freem(m);
return (0);
}
toep->tp_flags &= ~TP_ABORT_REQ_RCVD;
/*
* If we'd sent a reset on this toep, we'll ignore this and clean up in
* the T3's reply to our reset instead.
*/
if (toep->tp_flags & TP_ABORT_RPL_PENDING) {
toep->tp_flags |= TP_ABORT_RPL_SENT;
INP_WUNLOCK(inp);
} else {
so_error_set(so, abort_status_to_errno(tp, req->status));
tp = tcp_close(tp);
if (tp == NULL)
INP_WLOCK(inp); /* re-acquire */
toepcb_release(toep); /* no more CPLs expected */
}
INP_INFO_WUNLOCK(&V_tcbinfo);
send_abort_rpl(tod, tid, qset);
m_freem(m);
return (0);
}
static void
assign_rxopt(struct tcpcb *tp, uint16_t tcpopt)
{
struct toepcb *toep = tp->t_toe;
struct adapter *sc = toep->tp_tod->tod_softc;
tp->t_maxseg = tp->t_maxopd = sc->params.mtus[G_TCPOPT_MSS(tcpopt)] - 40;
if (G_TCPOPT_TSTAMP(tcpopt)) {
tp->t_flags |= TF_RCVD_TSTMP;
tp->t_flags |= TF_REQ_TSTMP; /* forcibly set */
tp->ts_recent = 0; /* XXX */
tp->ts_recent_age = tcp_ts_getticks();
tp->t_maxseg -= TCPOLEN_TSTAMP_APPA;
}
if (G_TCPOPT_SACK(tcpopt))
tp->t_flags |= TF_SACK_PERMIT;
else
tp->t_flags &= ~TF_SACK_PERMIT;
if (G_TCPOPT_WSCALE_OK(tcpopt))
tp->t_flags |= TF_RCVD_SCALE;
if ((tp->t_flags & (TF_RCVD_SCALE | TF_REQ_SCALE)) ==
(TF_RCVD_SCALE | TF_REQ_SCALE)) {
tp->rcv_scale = tp->request_r_scale;
tp->snd_scale = G_TCPOPT_SND_WSCALE(tcpopt);
}
}
/*
* The ISS and IRS are from after the exchange of SYNs and are off by 1.
*/
void
make_established(struct socket *so, uint32_t cpl_iss, uint32_t cpl_irs,
uint16_t cpl_tcpopt)
{
struct inpcb *inp = sotoinpcb(so);
struct tcpcb *tp = intotcpcb(inp);
struct toepcb *toep = tp->t_toe;
long bufsize;
uint32_t iss = be32toh(cpl_iss) - 1; /* true ISS */
uint32_t irs = be32toh(cpl_irs) - 1; /* true IRS */
uint16_t tcpopt = be16toh(cpl_tcpopt);
INP_WLOCK_ASSERT(inp);
tp->t_state = TCPS_ESTABLISHED;
tp->t_starttime = ticks;
TCPSTAT_INC(tcps_connects);
CTR4(KTR_CXGB, "%s tid %u, toep %p, inp %p", tcpstates[tp->t_state],
toep->tp_tid, toep, inp);
tp->irs = irs;
tcp_rcvseqinit(tp);
tp->rcv_wnd = toep->tp_rx_credits << 10;
tp->rcv_adv += tp->rcv_wnd;
tp->last_ack_sent = tp->rcv_nxt;
/*
* If we were unable to send all rx credits via opt0, save the remainder
* in rx_credits so that they can be handed over with the next credit
* update.
*/
SOCKBUF_LOCK(&so->so_rcv);
bufsize = select_rcv_wnd(so);
SOCKBUF_UNLOCK(&so->so_rcv);
toep->tp_rx_credits = bufsize - tp->rcv_wnd;
tp->iss = iss;
tcp_sendseqinit(tp);
tp->snd_una = iss + 1;
tp->snd_nxt = iss + 1;
tp->snd_max = iss + 1;
assign_rxopt(tp, tcpopt);
soisconnected(so);
}
/*
* Fill in the right TID for CPL messages waiting in the out-of-order queue
* and send them to the TOE.
*/
static void
fixup_and_send_ofo(struct toepcb *toep)
{
struct mbuf *m;
struct toedev *tod = toep->tp_tod;
struct adapter *sc = tod->tod_softc;
struct inpcb *inp = toep->tp_inp;
unsigned int tid = toep->tp_tid;
inp_lock_assert(inp);
while ((m = mbufq_dequeue(&toep->out_of_order_queue)) != NULL) {
struct ofld_hdr *oh = mtod(m, void *);
/*
* A variety of messages can be waiting but the fields we'll
* be touching are common to all so any message type will do.
*/
struct cpl_close_con_req *p = (void *)(oh + 1);
p->wr.wrh_lo = htonl(V_WR_TID(tid));
OPCODE_TID(p) = htonl(MK_OPCODE_TID(p->ot.opcode, tid));
t3_offload_tx(sc, m);
}
}
/*
* Process a CPL_ACT_ESTABLISH message.
*/
static int
do_act_establish(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct cpl_act_establish *req = mtod(m, void *);
unsigned int tid = GET_TID(req);
unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
struct toepcb *toep = lookup_atid(&td->tid_maps, atid);
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp;
struct socket *so;
CTR3(KTR_CXGB, "%s: atid %u, tid %u", __func__, atid, tid);
free_atid(&td->tid_maps, atid);
INP_WLOCK(inp);
tp = intotcpcb(inp);
KASSERT(toep->tp_qset == qs->idx,
("%s qset mismatch %d %d", __func__, toep->tp_qset, qs->idx));
KASSERT(toep->tp_tid == atid,
("%s atid mismatch %d %d", __func__, toep->tp_tid, atid));
toep->tp_tid = tid;
insert_tid(td, toep, tid);
if (inp->inp_flags & INP_DROPPED) {
/* socket closed by the kernel before hw told us it connected */
send_reset(toep);
goto done;
}
KASSERT(tp->t_state == TCPS_SYN_SENT,
("TID %u expected TCPS_SYN_SENT, found %d.", tid, tp->t_state));
so = inp->inp_socket;
make_established(so, req->snd_isn, req->rcv_isn, req->tcp_opt);
/*
* Now that we finally have a TID send any CPL messages that we had to
* defer for lack of a TID.
*/
if (mbufq_len(&toep->out_of_order_queue))
fixup_and_send_ofo(toep);
done:
INP_WUNLOCK(inp);
m_freem(m);
return (0);
}
/*
* Process an acknowledgment of WR completion. Advance snd_una and send the
* next batch of work requests from the write queue.
*/
static void
wr_ack(struct toepcb *toep, struct mbuf *m)
{
struct inpcb *inp = toep->tp_inp;
struct tcpcb *tp;
struct cpl_wr_ack *hdr = mtod(m, void *);
struct socket *so;
unsigned int credits = ntohs(hdr->credits);
u32 snd_una = ntohl(hdr->snd_una);
int bytes = 0;
struct sockbuf *snd;
struct mbuf *p;
struct ofld_hdr *oh;
inp_wlock(inp);
tp = intotcpcb(inp);
so = inp->inp_socket;
toep->tp_wr_avail += credits;
if (toep->tp_wr_unacked > toep->tp_wr_max - toep->tp_wr_avail)
toep->tp_wr_unacked = toep->tp_wr_max - toep->tp_wr_avail;
while (credits) {
p = peek_wr(toep);
if (__predict_false(!p)) {
CTR5(KTR_CXGB, "%s: %u extra WR_ACK credits, "
"tid %u, state %u, wr_avail %u", __func__, credits,
toep->tp_tid, tp->t_state, toep->tp_wr_avail);
log(LOG_ERR, "%u WR_ACK credits for TID %u with "
"nothing pending, state %u wr_avail=%u\n",
credits, toep->tp_tid, tp->t_state, toep->tp_wr_avail);
break;
}
oh = mtod(p, struct ofld_hdr *);
KASSERT(credits >= G_HDR_NDESC(oh->flags),
("%s: partial credits? %d %d", __func__, credits,
G_HDR_NDESC(oh->flags)));
dequeue_wr(toep);
credits -= G_HDR_NDESC(oh->flags);
bytes += oh->plen;
if (oh->flags & F_HDR_SGL)
sglist_free(oh->sgl);
m_freem(p);
}
if (__predict_false(SEQ_LT(snd_una, tp->snd_una)))
goto out_free;
if (tp->snd_una != snd_una) {
tp->snd_una = snd_una;
tp->ts_recent_age = tcp_ts_getticks();
if (tp->snd_una == tp->snd_nxt)
toep->tp_flags &= ~TP_TX_WAIT_IDLE;
}
snd = so_sockbuf_snd(so);
if (bytes) {
SOCKBUF_LOCK(snd);
sbdrop_locked(snd, bytes);
so_sowwakeup_locked(so);
}
if (snd->sb_sndptroff < snd->sb_cc)
t3_push_frames(so, 0);
out_free:
inp_wunlock(tp->t_inpcb);
m_freem(m);
}
/*
* Handler for TX_DATA_ACK CPL messages.
*/
static int
do_wr_ack(struct sge_qset *qs, struct rsp_desc *r, struct mbuf *m)
{
struct adapter *sc = qs->adap;
struct tom_data *td = sc->tom_softc;
struct cpl_wr_ack *hdr = mtod(m, void *);
unsigned int tid = GET_TID(hdr);
struct toepcb *toep = lookup_tid(&td->tid_maps, tid);
/* XXX bad race */
if (toep)
wr_ack(toep, m);
return (0);
}
/*
* Build a CPL_BARRIER message as payload of a ULP_TX_PKT command.
*/
static inline void
mk_cpl_barrier_ulp(struct cpl_barrier *b)
{
struct ulp_txpkt *txpkt = (struct ulp_txpkt *)b;
txpkt->cmd_dest = htonl(V_ULPTX_CMD(ULP_TXPKT));
txpkt->len = htonl(V_ULPTX_NFLITS(sizeof(*b) / 8));
b->opcode = CPL_BARRIER;
}
/*
* Build a CPL_GET_TCB message as payload of a ULP_TX_PKT command.
*/
static inline void
mk_get_tcb_ulp(struct cpl_get_tcb *req, unsigned int tid, unsigned int cpuno)
{
struct ulp_txpkt *txpkt = (struct ulp_txpkt *)req;
txpkt = (struct ulp_txpkt *)req;
txpkt->cmd_dest = htonl(V_ULPTX_CMD(ULP_TXPKT));
txpkt->len = htonl(V_ULPTX_NFLITS(sizeof(*req) / 8));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_GET_TCB, tid));
req->cpuno = htons(cpuno);
}
/*
* Build a CPL_SET_TCB_FIELD message as payload of a ULP_TX_PKT command.
*/
static inline void
mk_set_tcb_field_ulp(struct cpl_set_tcb_field *req, unsigned int tid,
unsigned int word, uint64_t mask, uint64_t val)
{
struct ulp_txpkt *txpkt = (struct ulp_txpkt *)req;
txpkt->cmd_dest = htonl(V_ULPTX_CMD(ULP_TXPKT));
txpkt->len = htonl(V_ULPTX_NFLITS(sizeof(*req) / 8));
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
req->reply = V_NO_REPLY(1);
req->cpu_idx = 0;
req->word = htons(word);
req->mask = htobe64(mask);
req->val = htobe64(val);
}
void
t3_init_cpl_io(struct adapter *sc)
{
t3_register_cpl_handler(sc, CPL_ACT_ESTABLISH, do_act_establish);
t3_register_cpl_handler(sc, CPL_ACT_OPEN_RPL, do_act_open_rpl);
t3_register_cpl_handler(sc, CPL_RX_URG_NOTIFY, do_rx_urg_notify);
t3_register_cpl_handler(sc, CPL_RX_DATA, do_rx_data);
t3_register_cpl_handler(sc, CPL_TX_DMA_ACK, do_wr_ack);
t3_register_cpl_handler(sc, CPL_PEER_CLOSE, do_peer_close);
t3_register_cpl_handler(sc, CPL_ABORT_REQ_RSS, do_abort_req);
t3_register_cpl_handler(sc, CPL_ABORT_RPL_RSS, do_abort_rpl);
t3_register_cpl_handler(sc, CPL_CLOSE_CON_RPL, do_close_con_rpl);
t3_register_cpl_handler(sc, CPL_SMT_WRITE_RPL, do_smt_write_rpl);
t3_register_cpl_handler(sc, CPL_SET_TCB_RPL, do_set_tcb_rpl);
}
#endif