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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_cpl_io.c 237925 2012-07-01 13:43:30Z 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/domain.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sglist.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/tcp_seq.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"
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)
void
send_flowc_wr(struct toepcb *toep, struct flowc_tx_params *ftxp)
{
struct wrqe *wr;
struct fw_flowc_wr *flowc;
unsigned int nparams = ftxp ? 8 : 4, flowclen;
struct port_info *pi = toep->port;
struct adapter *sc = pi->adapter;
unsigned int pfvf = G_FW_VIID_PFN(pi->viid) << S_FW_VIID_PFN;
struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx];
KASSERT(!toepcb_flag(toep, TPF_FLOWC_WR_SENT),
("%s: flowc for tid %u sent already", __func__, toep->tid));
CTR2(KTR_CXGBE, "%s: tid %u", __func__, toep->tid);
flowclen = sizeof(*flowc) + nparams * sizeof(struct fw_flowc_mnemval);
wr = alloc_wrqe(roundup(flowclen, 16), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
flowc = wrtod(wr);
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(toep->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(toep->ofld_rxq->iq.abs_id);
if (ftxp) {
uint32_t sndbuf = min(ftxp->snd_space, sc->tt.sndbuf);
flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
flowc->mnemval[4].val = htobe32(ftxp->snd_nxt);
flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
flowc->mnemval[5].val = htobe32(ftxp->rcv_nxt);
flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
flowc->mnemval[6].val = htobe32(sndbuf);
flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
flowc->mnemval[7].val = htobe32(ftxp->mss);
}
txsd->tx_credits = howmany(flowclen, 16);
txsd->plen = 0;
KASSERT(toep->tx_credits >= txsd->tx_credits && toep->txsd_avail > 0,
("%s: not enough credits (%d)", __func__, toep->tx_credits));
toep->tx_credits -= txsd->tx_credits;
if (__predict_false(++toep->txsd_pidx == toep->txsd_total))
toep->txsd_pidx = 0;
toep->txsd_avail--;
toepcb_set_flag(toep, TPF_FLOWC_WR_SENT);
t4_wrq_tx(sc, wr);
}
void
send_reset(struct adapter *sc, struct toepcb *toep, uint32_t snd_nxt)
{
struct wrqe *wr;
struct cpl_abort_req *req;
int tid = toep->tid;
struct inpcb *inp = toep->inp;
struct tcpcb *tp = intotcpcb(inp); /* don't use if INP_DROPPED */
INP_WLOCK_ASSERT(inp);
CTR6(KTR_CXGBE, "%s: tid %d (%s), toep_flags 0x%x, inp_flags 0x%x%s",
__func__, toep->tid,
inp->inp_flags & INP_DROPPED ? "inp dropped" :
tcpstates[tp->t_state],
toep->flags, inp->inp_flags,
toepcb_flag(toep, TPF_ABORT_SHUTDOWN) ?
" (abort already in progress)" : "");
if (toepcb_flag(toep, TPF_ABORT_SHUTDOWN))
return; /* abort already in progress */
toepcb_set_flag(toep, TPF_ABORT_SHUTDOWN);
KASSERT(toepcb_flag(toep, TPF_FLOWC_WR_SENT),
("%s: flowc_wr not sent for tid %d.", __func__, tid));
wr = alloc_wrqe(sizeof(*req), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
req = wrtod(wr);
INIT_TP_WR_MIT_CPL(req, CPL_ABORT_REQ, tid);
if (inp->inp_flags & INP_DROPPED)
req->rsvd0 = htobe32(snd_nxt);
else
req->rsvd0 = htobe32(tp->snd_nxt);
req->rsvd1 = !toepcb_flag(toep, TPF_TX_DATA_SENT);
req->cmd = CPL_ABORT_SEND_RST;
/*
* XXX: What's the correct way to tell that the inp hasn't been detached
* from its socket? Should I even be flushing the snd buffer here?
*/
if ((inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) == 0) {
struct socket *so = inp->inp_socket;
if (so != NULL) /* because I'm not sure. See comment above */
sbflush(&so->so_snd);
}
t4_l2t_send(sc, wr, toep->l2te);
}
/*
* Called when a connection is established to translate the TCP options
* reported by HW to FreeBSD's native format.
*/
static void
assign_rxopt(struct tcpcb *tp, unsigned int opt)
{
struct toepcb *toep = tp->t_toe;
struct adapter *sc = td_adapter(toep->td);
INP_LOCK_ASSERT(tp->t_inpcb);
tp->t_maxseg = tp->t_maxopd = sc->params.mtus[G_TCPOPT_MSS(opt)] - 40;
if (G_TCPOPT_TSTAMP(opt)) {
tp->t_flags |= TF_RCVD_TSTMP; /* timestamps ok */
tp->ts_recent = 0; /* hmmm */
tp->ts_recent_age = tcp_ts_getticks();
tp->t_maxseg -= TCPOLEN_TSTAMP_APPA;
}
if (G_TCPOPT_SACK(opt))
tp->t_flags |= TF_SACK_PERMIT; /* should already be set */
else
tp->t_flags &= ~TF_SACK_PERMIT; /* sack disallowed by peer */
if (G_TCPOPT_WSCALE_OK(opt))
tp->t_flags |= TF_RCVD_SCALE;
/* Doing window scaling? */
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(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.
*/
void
make_established(struct toepcb *toep, uint32_t snd_isn, uint32_t rcv_isn,
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;
INP_WLOCK_ASSERT(inp);
KASSERT(tp->t_state == TCPS_SYN_SENT ||
tp->t_state == TCPS_SYN_RECEIVED,
("%s: TCP state %s", __func__, tcpstates[tp->t_state]));
CTR4(KTR_CXGBE, "%s: tid %d, toep %p, inp %p",
__func__, toep->tid, toep, inp);
tp->t_state = TCPS_ESTABLISHED;
tp->t_starttime = ticks;
TCPSTAT_INC(tcps_connects);
tp->irs = irs;
tcp_rcvseqinit(tp);
tp->rcv_wnd = toep->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->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);
SOCKBUF_LOCK(&so->so_snd);
if (so->so_snd.sb_flags & SB_AUTOSIZE && V_tcp_do_autosndbuf)
bufsize = V_tcp_autosndbuf_max;
else
bufsize = sbspace(&so->so_snd);
SOCKBUF_UNLOCK(&so->so_snd);
ftxp.snd_nxt = tp->snd_nxt;
ftxp.rcv_nxt = tp->rcv_nxt;
ftxp.snd_space = bufsize;
ftxp.mss = tp->t_maxseg;
send_flowc_wr(toep, &ftxp);
soisconnected(so);
}
static int
send_rx_credits(struct adapter *sc, struct toepcb *toep, uint32_t credits)
{
struct wrqe *wr;
struct cpl_rx_data_ack *req;
uint32_t dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
wr = alloc_wrqe(sizeof(*req), toep->ctrlq);
if (wr == NULL)
return (0);
req = wrtod(wr);
INIT_TP_WR_MIT_CPL(req, CPL_RX_DATA_ACK, toep->tid);
req->credit_dack = htobe32(dack | V_RX_CREDITS(credits));
t4_wrq_tx(sc, wr);
return (credits);
}
void
t4_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->enqueued >= so_rcv->sb_cc,
("%s: so_rcv->sb_cc > enqueued", __func__));
toep->rx_credits += toep->enqueued - so_rcv->sb_cc;
toep->enqueued = so_rcv->sb_cc;
SOCKBUF_UNLOCK(so_rcv);
must_send = toep->rx_credits + 16384 >= tp->rcv_wnd;
if (must_send || toep->rx_credits >= 15 * 1024) {
int credits;
credits = send_rx_credits(sc, toep, toep->rx_credits);
toep->rx_credits -= credits;
tp->rcv_wnd += credits;
tp->rcv_adv += credits;
}
}
/*
* Close a connection by sending a CPL_CLOSE_CON_REQ message.
*/
static int
close_conn(struct adapter *sc, struct toepcb *toep)
{
struct wrqe *wr;
struct cpl_close_con_req *req;
unsigned int tid = toep->tid;
CTR3(KTR_CXGBE, "%s: tid %u%s", __func__, toep->tid,
toepcb_flag(toep, TPF_FIN_SENT) ? ", IGNORED" : "");
if (toepcb_flag(toep, TPF_FIN_SENT))
return (0);
KASSERT(toepcb_flag(toep, TPF_FLOWC_WR_SENT),
("%s: flowc_wr not sent for tid %u.", __func__, tid));
wr = alloc_wrqe(sizeof(*req), toep->ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
req = wrtod(wr);
req->wr.wr_hi = htonl(V_FW_WR_OP(FW_TP_WR) |
V_FW_WR_IMMDLEN(sizeof(*req) - sizeof(req->wr)));
req->wr.wr_mid = htonl(V_FW_WR_LEN16(howmany(sizeof(*req), 16)) |
V_FW_WR_FLOWID(tid));
req->wr.wr_lo = cpu_to_be64(0);
OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
req->rsvd = 0;
toepcb_set_flag(toep, TPF_FIN_SENT);
toepcb_clr_flag(toep, TPF_SEND_FIN);
t4_l2t_send(sc, wr, toep->l2te);
return (0);
}
#define MAX_OFLD_TX_CREDITS (SGE_MAX_WR_LEN / 16)
#define MIN_OFLD_TX_CREDITS (howmany(sizeof(struct fw_ofld_tx_data_wr) + 1, 16))
/* Maximum amount of immediate data we could stuff in a WR */
static inline int
max_imm_payload(int tx_credits)
{
const int n = 2; /* Use only up to 2 desc for imm. data WR */
KASSERT(tx_credits >= 0 &&
tx_credits <= MAX_OFLD_TX_CREDITS,
("%s: %d credits", __func__, tx_credits));
if (tx_credits < MIN_OFLD_TX_CREDITS)
return (0);
if (tx_credits >= (n * EQ_ESIZE) / 16)
return ((n * EQ_ESIZE) - sizeof(struct fw_ofld_tx_data_wr));
else
return (tx_credits * 16 - sizeof(struct fw_ofld_tx_data_wr));
}
/* Maximum number of SGL entries we could stuff in a WR */
static inline int
max_dsgl_nsegs(int tx_credits)
{
int nseg = 1; /* ulptx_sgl has room for 1, rest ulp_tx_sge_pair */
int sge_pair_credits = tx_credits - MIN_OFLD_TX_CREDITS;
KASSERT(tx_credits >= 0 &&
tx_credits <= MAX_OFLD_TX_CREDITS,
("%s: %d credits", __func__, tx_credits));
if (tx_credits < MIN_OFLD_TX_CREDITS)
return (0);
nseg += 2 * (sge_pair_credits * 16 / 24);
if ((sge_pair_credits * 16) % 24 == 16)
nseg++;
return (nseg);
}
static inline void
write_tx_wr(void *dst, struct toepcb *toep, unsigned int immdlen,
unsigned int plen, uint8_t credits, int more_to_come)
{
struct fw_ofld_tx_data_wr *txwr = dst;
int shove = !more_to_come;
int compl = 1;
/*
* We always request completion notifications from the firmware. The
* only exception is when we know we'll get more data to send shortly
* and that we'll have some tx credits remaining to transmit that data.
*/
if (more_to_come && toep->tx_credits - credits >= MIN_OFLD_TX_CREDITS)
compl = 0;
txwr->op_to_immdlen = htobe32(V_WR_OP(FW_OFLD_TX_DATA_WR) |
V_FW_WR_COMPL(compl) | V_FW_WR_IMMDLEN(immdlen));
txwr->flowid_len16 = htobe32(V_FW_WR_FLOWID(toep->tid) |
V_FW_WR_LEN16(credits));
txwr->tunnel_to_proxy =
htobe32(V_FW_OFLD_TX_DATA_WR_ULPMODE(toep->ulp_mode) |
V_FW_OFLD_TX_DATA_WR_URGENT(0) | /* XXX */
V_FW_OFLD_TX_DATA_WR_SHOVE(shove));
txwr->plen = htobe32(plen);
}
/*
* Generate a DSGL from a starting mbuf. The total number of segments and the
* maximum segments in any one mbuf are provided.
*/
static void
write_tx_sgl(void *dst, struct mbuf *start, struct mbuf *stop, int nsegs, int n)
{
struct mbuf *m;
struct ulptx_sgl *usgl = dst;
int i, j, rc;
struct sglist sg;
struct sglist_seg segs[n];
KASSERT(nsegs > 0, ("%s: nsegs 0", __func__));
sglist_init(&sg, n, segs);
usgl->cmd_nsge = htobe32(V_ULPTX_CMD(ULP_TX_SC_DSGL) |
V_ULPTX_NSGE(nsegs));
i = -1;
for (m = start; m != stop; m = m->m_next) {
rc = sglist_append(&sg, mtod(m, void *), m->m_len);
if (__predict_false(rc != 0))
panic("%s: sglist_append %d", __func__, rc);
for (j = 0; j < sg.sg_nseg; i++, j++) {
if (i < 0) {
usgl->len0 = htobe32(segs[j].ss_len);
usgl->addr0 = htobe64(segs[j].ss_paddr);
} else {
usgl->sge[i / 2].len[i & 1] =
htobe32(segs[j].ss_len);
usgl->sge[i / 2].addr[i & 1] =
htobe64(segs[j].ss_paddr);
}
#ifdef INVARIANTS
nsegs--;
#endif
}
sglist_reset(&sg);
}
if (i & 1)
usgl->sge[i / 2].len[1] = htobe32(0);
KASSERT(nsegs == 0, ("%s: nsegs %d, start %p, stop %p",
__func__, nsegs, start, stop));
}
/*
* Max number of SGL entries an offload tx work request can have. This is 41
* (1 + 40) for a full 512B work request.
* fw_ofld_tx_data_wr(16B) + ulptx_sgl(16B, 1) + ulptx_sge_pair(480B, 40)
*/
#define OFLD_SGL_LEN (41)
/*
* Send data and/or a FIN to the peer.
*
* The socket's so_snd buffer consists of a stream of data starting with sb_mb
* and linked together with m_next. sb_sndptr, if set, is the last mbuf that
* was transmitted.
*/
static void
t4_push_frames(struct adapter *sc, struct toepcb *toep)
{
struct mbuf *sndptr, *m, *sb_sndptr;
struct fw_ofld_tx_data_wr *txwr;
struct wrqe *wr;
unsigned int plen, nsegs, credits, max_imm, max_nsegs, max_nsegs_1mbuf;
struct inpcb *inp = toep->inp;
struct tcpcb *tp = intotcpcb(inp);
struct socket *so = inp->inp_socket;
struct sockbuf *sb = &so->so_snd;
int tx_credits;
struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx];
INP_WLOCK_ASSERT(inp);
KASSERT(toepcb_flag(toep, TPF_FLOWC_WR_SENT),
("%s: flowc_wr not sent for tid %u.", __func__, toep->tid));
if (toep->ulp_mode != ULP_MODE_NONE)
CXGBE_UNIMPLEMENTED("ulp_mode");
/*
* This function doesn't resume by itself. Someone else must clear the
* flag and call this function.
*/
if (__predict_false(toepcb_flag(toep, TPF_TX_SUSPENDED)))
return;
do {
tx_credits = min(toep->tx_credits, MAX_OFLD_TX_CREDITS);
max_imm = max_imm_payload(tx_credits);
max_nsegs = max_dsgl_nsegs(tx_credits);
SOCKBUF_LOCK(sb);
sb_sndptr = sb->sb_sndptr;
sndptr = sb_sndptr ? sb_sndptr->m_next : sb->sb_mb;
plen = 0;
nsegs = 0;
max_nsegs_1mbuf = 0; /* max # of SGL segments in any one mbuf */
for (m = sndptr; m != NULL; m = m->m_next) {
int n = sglist_count(mtod(m, void *), m->m_len);
nsegs += n;
plen += m->m_len;
/* This mbuf sent us _over_ the nsegs limit, back out */
if (plen > max_imm && nsegs > max_nsegs) {
nsegs -= n;
plen -= m->m_len;
if (plen == 0) {
/* Too few credits */
toepcb_set_flag(toep, TPF_TX_SUSPENDED);
SOCKBUF_UNLOCK(sb);
return;
}
break;
}
if (max_nsegs_1mbuf < n)
max_nsegs_1mbuf = n;
sb_sndptr = m; /* new sb->sb_sndptr if all goes well */
/* This mbuf put us right at the max_nsegs limit */
if (plen > max_imm && nsegs == max_nsegs) {
m = m->m_next;
break;
}
}
if (sb->sb_flags & SB_AUTOSIZE &&
V_tcp_do_autosndbuf &&
sb->sb_hiwat < V_tcp_autosndbuf_max &&
sbspace(sb) < sb->sb_hiwat / 8 * 7) {
int newsize = min(sb->sb_hiwat + V_tcp_autosndbuf_inc,
V_tcp_autosndbuf_max);
if (!sbreserve_locked(sb, newsize, so, NULL))
sb->sb_flags &= ~SB_AUTOSIZE;
else {
sowwakeup_locked(so); /* room available */
SOCKBUF_UNLOCK_ASSERT(sb);
goto unlocked;
}
}
SOCKBUF_UNLOCK(sb);
unlocked:
/* nothing to send */
if (plen == 0) {
KASSERT(m == NULL,
("%s: nothing to send, but m != NULL", __func__));
break;
}
if (__predict_false(toepcb_flag(toep, TPF_FIN_SENT)))
panic("%s: excess tx.", __func__);
if (plen <= max_imm) {
/* Immediate data tx */
wr = alloc_wrqe(roundup(sizeof(*txwr) + plen, 16),
toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toepcb_set_flag(toep, TPF_TX_SUSPENDED);
return;
}
txwr = wrtod(wr);
credits = howmany(wr->wr_len, 16);
write_tx_wr(txwr, toep, plen, plen, credits,
tp->t_flags & TF_MORETOCOME);
m_copydata(sndptr, 0, plen, (void *)(txwr + 1));
} else {
int wr_len;
/* DSGL tx */
wr_len = sizeof(*txwr) + sizeof(struct ulptx_sgl) +
((3 * (nsegs - 1)) / 2 + ((nsegs - 1) & 1)) * 8;
wr = alloc_wrqe(roundup(wr_len, 16), toep->ofld_txq);
if (wr == NULL) {
/* XXX: how will we recover from this? */
toepcb_set_flag(toep, TPF_TX_SUSPENDED);
return;
}
txwr = wrtod(wr);
credits = howmany(wr_len, 16);
write_tx_wr(txwr, toep, 0, plen, credits,
tp->t_flags & TF_MORETOCOME);
write_tx_sgl(txwr + 1, sndptr, m, nsegs,
max_nsegs_1mbuf);
if (wr_len & 0xf) {
uint64_t *pad = (uint64_t *)
((uintptr_t)txwr + wr_len);
*pad = 0;
}
}
KASSERT(toep->tx_credits >= credits,
("%s: not enough credits", __func__));
toep->tx_credits -= credits;
tp->snd_nxt += plen;
tp->snd_max += plen;
SOCKBUF_LOCK(sb);
KASSERT(sb_sndptr, ("%s: sb_sndptr is NULL", __func__));
sb->sb_sndptr = sb_sndptr;
SOCKBUF_UNLOCK(sb);
toepcb_set_flag(toep, TPF_TX_DATA_SENT);
KASSERT(toep->txsd_avail > 0, ("%s: no txsd", __func__));
txsd->plen = plen;
txsd->tx_credits = credits;
txsd++;
if (__predict_false(++toep->txsd_pidx == toep->txsd_total)) {
toep->txsd_pidx = 0;
txsd = &toep->txsd[0];
}
toep->txsd_avail--;
t4_l2t_send(sc, wr, toep->l2te);
} while (m != NULL);
/* Send a FIN if requested, but only if there's no more data to send */
if (m == NULL && toepcb_flag(toep, TPF_SEND_FIN))
close_conn(sc, toep);
}
int
t4_tod_output(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
#ifdef INVARIANTS
struct inpcb *inp = tp->t_inpcb;
#endif
struct toepcb *toep = tp->t_toe;
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & INP_DROPPED) == 0,
("%s: inp %p dropped.", __func__, inp));
KASSERT(toep != NULL, ("%s: toep is NULL", __func__));
t4_push_frames(sc, toep);
return (0);
}
int
t4_send_fin(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
#ifdef INVARIANTS
struct inpcb *inp = tp->t_inpcb;
#endif
struct toepcb *toep = tp->t_toe;
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & INP_DROPPED) == 0,
("%s: inp %p dropped.", __func__, inp));
KASSERT(toep != NULL, ("%s: toep is NULL", __func__));
toepcb_set_flag(toep, TPF_SEND_FIN);
t4_push_frames(sc, toep);
return (0);
}
int
t4_send_rst(struct toedev *tod, struct tcpcb *tp)
{
struct adapter *sc = tod->tod_softc;
#if defined(INVARIANTS)
struct inpcb *inp = tp->t_inpcb;
#endif
struct toepcb *toep = tp->t_toe;
INP_WLOCK_ASSERT(inp);
KASSERT((inp->inp_flags & INP_DROPPED) == 0,
("%s: inp %p dropped.", __func__, inp));
KASSERT(toep != NULL, ("%s: toep is NULL", __func__));
/* hmmmm */
KASSERT(toepcb_flag(toep, TPF_FLOWC_WR_SENT),
("%s: flowc for tid %u [%s] not sent already",
__func__, toep->tid, tcpstates[tp->t_state]));
send_reset(sc, toep, 0);
return (0);
}
/*
* Peer has sent us a FIN.
*/
static int
do_peer_close(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_peer_close *cpl = (const void *)(rss + 1);
unsigned int tid = GET_TID(cpl);
struct toepcb *toep = lookup_tid(sc, tid);
struct inpcb *inp = toep->inp;
struct tcpcb *tp = NULL;
struct socket *so = NULL;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_PEER_CLOSE,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
tp = intotcpcb(inp);
CTR5(KTR_CXGBE, "%s: tid %u (%s), toep_flags 0x%x, inp %p", __func__,
tid, tp ? tcpstates[tp->t_state] : "no tp", toep->flags, inp);
if (toepcb_flag(toep, TPF_ABORT_SHUTDOWN))
goto done;
so = inp->inp_socket;
socantrcvmore(so);
tp->rcv_nxt++; /* FIN */
KASSERT(tp->rcv_nxt == be32toh(cpl->rcv_nxt),
("%s: rcv_nxt mismatch: %u %u", __func__, tp->rcv_nxt,
be32toh(cpl->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);
final_cpl_received(toep);
return (0);
default:
log(LOG_ERR, "%s: TID %u received CPL_PEER_CLOSE in state %d\n",
__func__, tid, tp->t_state);
}
done:
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
return (0);
}
/*
* Peer has ACK'd our FIN.
*/
static int
do_close_con_rpl(struct sge_iq *iq, const struct rss_header *rss,
struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_close_con_rpl *cpl = (const void *)(rss + 1);
unsigned int tid = GET_TID(cpl);
struct toepcb *toep = lookup_tid(sc, tid);
struct inpcb *inp = toep->inp;
struct tcpcb *tp = NULL;
struct socket *so = NULL;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
KASSERT(opcode == CPL_CLOSE_CON_RPL,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
INP_INFO_WLOCK(&V_tcbinfo);
INP_WLOCK(inp);
tp = intotcpcb(inp);
CTR4(KTR_CXGBE, "%s: tid %u (%s), toep_flags 0x%x",
__func__, tid, tp ? tcpstates[tp->t_state] : "no tp", toep->flags);
if (toepcb_flag(toep, TPF_ABORT_SHUTDOWN))
goto done;
so = inp->inp_socket;
tp->snd_una = be32toh(cpl->snd_nxt) - 1; /* exclude FIN */
switch (tp->t_state) {
case TCPS_CLOSING: /* see TCPS_FIN_WAIT_2 in do_peer_close too */
tcp_twstart(tp);
release:
INP_UNLOCK_ASSERT(inp); /* safe, we have a ref on the inp */
INP_INFO_WUNLOCK(&V_tcbinfo);
INP_WLOCK(inp);
final_cpl_received(toep); /* no more CPLs expected */
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 CPL_CLOSE_CON_RPL in state %s\n",
__func__, tid, tcpstates[tp->t_state]);
}
done:
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
return (0);
}
void
send_abort_rpl(struct adapter *sc, struct sge_wrq *ofld_txq, int tid,
int rst_status)
{
struct wrqe *wr;
struct cpl_abort_rpl *cpl;
wr = alloc_wrqe(sizeof(*cpl), ofld_txq);
if (wr == NULL) {
/* XXX */
panic("%s: allocation failure.", __func__);
}
cpl = wrtod(wr);
INIT_TP_WR_MIT_CPL(cpl, CPL_ABORT_RPL, tid);
cpl->cmd = rst_status;
t4_wrq_tx(sc, wr);
}
static int
abort_status_to_errno(struct tcpcb *tp, unsigned 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);
}
}
/*
* TCP RST from the peer, timeout, or some other such critical error.
*/
static int
do_abort_req(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 toepcb *toep = lookup_tid(sc, tid);
struct sge_wrq *ofld_txq = toep->ofld_txq;
struct inpcb *inp;
struct tcpcb *tp;
struct socket *so;
#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__));
if (toepcb_flag(toep, TPF_SYNQE))
return (do_abort_req_synqe(iq, rss, m));
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
if (cpl->status == CPL_ERR_RTX_NEG_ADVICE ||
cpl->status == CPL_ERR_PERSIST_NEG_ADVICE) {
CTR4(KTR_CXGBE, "%s: negative advice %d for tid %d (0x%x)",
__func__, cpl->status, tid, toep->flags);
return (0); /* Ignore negative advice */
}
inp = toep->inp;
INP_INFO_WLOCK(&V_tcbinfo); /* for tcp_close */
INP_WLOCK(inp);
tp = intotcpcb(inp);
so = inp->inp_socket;
CTR6(KTR_CXGBE,
"%s: tid %d (%s), toep_flags 0x%x, inp_flags 0x%x, status %d",
__func__, tid, tcpstates[tp->t_state], toep->flags, inp->inp_flags,
cpl->status);
/*
* 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 (toepcb_flag(toep, TPF_ABORT_SHUTDOWN)) {
INP_WUNLOCK(inp);
goto done;
}
toepcb_set_flag(toep, TPF_ABORT_SHUTDOWN);
so_error_set(so, abort_status_to_errno(tp, cpl->status));
tp = tcp_close(tp);
if (tp == NULL)
INP_WLOCK(inp); /* re-acquire */
final_cpl_received(toep);
done:
INP_INFO_WUNLOCK(&V_tcbinfo);
send_abort_rpl(sc, ofld_txq, tid, CPL_ABORT_NO_RST);
return (0);
}
/*
* Reply to the CPL_ABORT_REQ (send_reset)
*/
static int
do_abort_rpl(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 toepcb *toep = lookup_tid(sc, tid);
struct inpcb *inp = toep->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__));
if (toepcb_flag(toep, TPF_SYNQE))
return (do_abort_rpl_synqe(iq, rss, m));
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
CTR5(KTR_CXGBE, "%s: tid %u, toep %p, inp %p, status %d",
__func__, tid, toep, inp, cpl->status);
KASSERT(toepcb_flag(toep, TPF_ABORT_SHUTDOWN),
("%s: wasn't expecting abort reply", __func__));
INP_WLOCK(inp);
final_cpl_received(toep);
return (0);
}
static int
do_rx_data(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_rx_data *cpl = mtod(m, const void *);
unsigned int tid = GET_TID(cpl);
struct toepcb *toep = lookup_tid(sc, tid);
struct inpcb *inp = toep->inp;
struct tcpcb *tp;
struct socket *so;
struct sockbuf *so_rcv;
if (__predict_false(toepcb_flag(toep, TPF_SYNQE))) {
/*
* do_pass_establish failed and must be attempting to abort the
* synqe's tid. Meanwhile, the T4 has sent us data for such a
* connection.
*/
KASSERT(toepcb_flag(toep, TPF_ABORT_SHUTDOWN),
("%s: synqe and tid isn't being aborted.", __func__));
m_freem(m);
return (0);
}
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
/* strip off CPL header */
m_adj(m, sizeof(*cpl));
INP_WLOCK(inp);
if (inp->inp_flags & (INP_DROPPED | INP_TIMEWAIT)) {
CTR4(KTR_CXGBE, "%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);
}
tp = intotcpcb(inp);
#ifdef INVARIANTS
if (__predict_false(tp->rcv_nxt != be32toh(cpl->seq))) {
log(LOG_ERR,
"%s: unexpected seq# %x for TID %u, rcv_nxt %x\n",
__func__, be32toh(cpl->seq), toep->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_inpcbtosocket(inp);
so_rcv = &so->so_rcv;
SOCKBUF_LOCK(so_rcv);
if (__predict_false(so_rcv->sb_state & SBS_CANTRCVMORE)) {
CTR3(KTR_CXGBE, "%s: tid %u, excess rx (%d bytes)",
__func__, tid, m->m_pkthdr.len);
m_freem(m);
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);
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)) {
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->rx_credits += newsize - hiwat;
}
toep->enqueued += m->m_pkthdr.len;
sbappendstream_locked(so_rcv, m);
sorwakeup_locked(so);
SOCKBUF_UNLOCK_ASSERT(so_rcv);
INP_WUNLOCK(inp);
return (0);
}
#define S_CPL_FW4_ACK_OPCODE 24
#define M_CPL_FW4_ACK_OPCODE 0xff
#define V_CPL_FW4_ACK_OPCODE(x) ((x) << S_CPL_FW4_ACK_OPCODE)
#define G_CPL_FW4_ACK_OPCODE(x) \
(((x) >> S_CPL_FW4_ACK_OPCODE) & M_CPL_FW4_ACK_OPCODE)
#define S_CPL_FW4_ACK_FLOWID 0
#define M_CPL_FW4_ACK_FLOWID 0xffffff
#define V_CPL_FW4_ACK_FLOWID(x) ((x) << S_CPL_FW4_ACK_FLOWID)
#define G_CPL_FW4_ACK_FLOWID(x) \
(((x) >> S_CPL_FW4_ACK_FLOWID) & M_CPL_FW4_ACK_FLOWID)
#define S_CPL_FW4_ACK_CR 24
#define M_CPL_FW4_ACK_CR 0xff
#define V_CPL_FW4_ACK_CR(x) ((x) << S_CPL_FW4_ACK_CR)
#define G_CPL_FW4_ACK_CR(x) (((x) >> S_CPL_FW4_ACK_CR) & M_CPL_FW4_ACK_CR)
#define S_CPL_FW4_ACK_SEQVAL 0
#define M_CPL_FW4_ACK_SEQVAL 0x1
#define V_CPL_FW4_ACK_SEQVAL(x) ((x) << S_CPL_FW4_ACK_SEQVAL)
#define G_CPL_FW4_ACK_SEQVAL(x) \
(((x) >> S_CPL_FW4_ACK_SEQVAL) & M_CPL_FW4_ACK_SEQVAL)
#define F_CPL_FW4_ACK_SEQVAL V_CPL_FW4_ACK_SEQVAL(1U)
static int
do_fw4_ack(struct sge_iq *iq, const struct rss_header *rss, struct mbuf *m)
{
struct adapter *sc = iq->adapter;
const struct cpl_fw4_ack *cpl = (const void *)(rss + 1);
unsigned int tid = G_CPL_FW4_ACK_FLOWID(be32toh(OPCODE_TID(cpl)));
struct toepcb *toep = lookup_tid(sc, tid);
struct inpcb *inp;
struct tcpcb *tp;
struct socket *so;
uint8_t credits = cpl->credits;
struct ofld_tx_sdesc *txsd;
int plen;
#ifdef INVARIANTS
unsigned int opcode = G_CPL_FW4_ACK_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
/*
* Very unusual case: we'd sent a flowc + abort_req for a synq entry and
* now this comes back carrying the credits for the flowc.
*/
if (__predict_false(toepcb_flag(toep, TPF_SYNQE))) {
KASSERT(toepcb_flag(toep, TPF_ABORT_SHUTDOWN),
("%s: credits for a synq entry %p", __func__, toep));
return (0);
}
inp = toep->inp;
KASSERT(opcode == CPL_FW4_ACK,
("%s: unexpected opcode 0x%x", __func__, opcode));
KASSERT(m == NULL, ("%s: wasn't expecting payload", __func__));
KASSERT(toep->tid == tid, ("%s: toep tid mismatch", __func__));
INP_WLOCK(inp);
if (__predict_false(toepcb_flag(toep, TPF_ABORT_SHUTDOWN))) {
INP_WUNLOCK(inp);
return (0);
}
KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
("%s: inp_flags 0x%x", __func__, inp->inp_flags));
tp = intotcpcb(inp);
if (cpl->flags & CPL_FW4_ACK_FLAGS_SEQVAL) {
tcp_seq snd_una = be32toh(cpl->snd_una);
#ifdef INVARIANTS
if (__predict_false(SEQ_LT(snd_una, tp->snd_una))) {
log(LOG_ERR,
"%s: unexpected seq# %x for TID %u, snd_una %x\n",
__func__, snd_una, toep->tid, tp->snd_una);
}
#endif
if (tp->snd_una != snd_una) {
tp->snd_una = snd_una;
tp->ts_recent_age = tcp_ts_getticks();
}
}
so = inp->inp_socket;
txsd = &toep->txsd[toep->txsd_cidx];
plen = 0;
while (credits) {
KASSERT(credits >= txsd->tx_credits,
("%s: too many (or partial) credits", __func__));
credits -= txsd->tx_credits;
toep->tx_credits += txsd->tx_credits;
plen += txsd->plen;
txsd++;
toep->txsd_avail++;
KASSERT(toep->txsd_avail <= toep->txsd_total,
("%s: txsd avail > total", __func__));
if (__predict_false(++toep->txsd_cidx == toep->txsd_total)) {
txsd = &toep->txsd[0];
toep->txsd_cidx = 0;
}
}
if (plen > 0) {
struct sockbuf *sb = &so->so_snd;
SOCKBUF_LOCK(sb);
sbdrop_locked(sb, plen);
sowwakeup_locked(so);
SOCKBUF_UNLOCK_ASSERT(sb);
}
/* XXX */
if ((toepcb_flag(toep, TPF_TX_SUSPENDED) &&
toep->tx_credits >= MIN_OFLD_TX_CREDITS) ||
toep->tx_credits == toep->txsd_total *
howmany((sizeof(struct fw_ofld_tx_data_wr) + 1), 16)) {
toepcb_clr_flag(toep, TPF_TX_SUSPENDED);
t4_push_frames(sc, toep);
}
INP_WUNLOCK(inp);
return (0);
}
void
t4_init_cpl_io_handlers(struct adapter *sc)
{
t4_register_cpl_handler(sc, CPL_PEER_CLOSE, do_peer_close);
t4_register_cpl_handler(sc, CPL_CLOSE_CON_RPL, do_close_con_rpl);
t4_register_cpl_handler(sc, CPL_ABORT_REQ_RSS, do_abort_req);
t4_register_cpl_handler(sc, CPL_ABORT_RPL_RSS, do_abort_rpl);
t4_register_cpl_handler(sc, CPL_RX_DATA, do_rx_data);
t4_register_cpl_handler(sc, CPL_FW4_ACK, do_fw4_ack);
}
#endif