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* Remove code which has no effect.

Browse Source 
* Clean up the handling in sctp_lower_sosend().

MFC after: 3 weeks.
This commit is contained in:
Michael Tuexen 2010-09-09 20:51:23 +00:00
parent 781413510d
commit e95307c5c5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212380
1 changed files with 61 additions and 108 deletions
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169
sys/netinet/sctp_output.c
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@ -12124,7 +12124,6 @@ sctp_sosend(struct socket *so,
struct thread *p
)
{
struct sctp_inpcb *inp;
int error, use_rcvinfo = 0;
struct sctp_sndrcvinfo srcv;
struct sockaddr *addr_to_use;
@ -12134,7 +12133,6 @@ sctp_sosend(struct socket *so,
#endif
inp = (struct sctp_inpcb *)so->so_pcb;
if (control) {
/* process cmsg snd/rcv info (maybe a assoc-id) */
if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
@ -12182,7 +12180,7 @@ sctp_lower_sosend(struct socket *so,
struct mbuf *top = NULL;
int queue_only = 0, queue_only_for_init = 0;
int free_cnt_applied = 0;
int un_sent = 0;
int un_sent;
int now_filled = 0;
unsigned int inqueue_bytes = 0;
struct sctp_block_entry be;
@ -12525,9 +12523,10 @@ sctp_lower_sosend(struct socket *so,
* change it BEFORE we append the message.
*/
}
}
} else
asoc = &stcb->asoc;
if (srcv == NULL)
srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
if (addr)
net = sctp_findnet(stcb, addr);
@ -12542,14 +12541,10 @@ sctp_lower_sosend(struct socket *so,
} else {
net = stcb->asoc.primary_destination;
}
if ((SCTP_SO_IS_NBIO(so)
|| (flags & MSG_NBIO)
)) {
non_blocking = 1;
}
asoc = &stcb->asoc;
atomic_add_int(&stcb->total_sends, 1);
/* Keep the stcb from being freed under our feet */
atomic_add_int(&asoc->refcnt, 1);
free_cnt_applied = 1;
if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
if (sndlen > asoc->smallest_mtu) {
@ -12558,6 +12553,11 @@ sctp_lower_sosend(struct socket *so,
goto out_unlocked;
}
}
if ((SCTP_SO_IS_NBIO(so)
|| (flags & MSG_NBIO)
)) {
non_blocking = 1;
}
/* would we block? */
if (non_blocking) {
if (hold_tcblock == 0) {
@ -12581,17 +12581,6 @@ sctp_lower_sosend(struct socket *so,
atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
}
local_soresv = sndlen;
/* Keep the stcb from being freed under our feet */
if (free_cnt_applied) {
#ifdef INVARIANTS
panic("refcnt already incremented");
#else
printf("refcnt:1 already incremented?\n");
#endif
} else {
atomic_add_int(&stcb->asoc.refcnt, 1);
free_cnt_applied = 1;
}
if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
error = ECONNRESET;
@ -12634,26 +12623,6 @@ sctp_lower_sosend(struct socket *so,
if (p) {
p->td_ru.ru_msgsnd++;
}
if ((net->flight_size > net->cwnd) &&
(asoc->sctp_cmt_on_off == 0)) {
/*-
* CMT: Added check for CMT above. net above is the primary
* dest. If CMT is ON, sender should always attempt to send
* with the output routine sctp_fill_outqueue() that loops
* through all destination addresses. Therefore, if CMT is
* ON, queue_only is NOT set to 1 here, so that
* sctp_chunk_output() can be called below.
*/
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2))
queue_only = 1;
asoc->ifp_had_enobuf = 0;
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
}
/* Are we aborting? */
if (srcv->sinfo_flags & SCTP_ABORT) {
struct mbuf *mm;
@ -12857,7 +12826,6 @@ sctp_lower_sosend(struct socket *so,
}
inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
}
inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
} else {
@ -12886,9 +12854,7 @@ sctp_lower_sosend(struct socket *so,
if (top == NULL) {
struct sctp_stream_queue_pending *sp;
struct sctp_stream_out *strm;
uint32_t sndout, initial_out;
initial_out = uio->uio_resid;
uint32_t sndout;
SCTP_TCB_SEND_LOCK(stcb);
if ((asoc->stream_locked) &&
@ -13052,29 +13018,34 @@ sctp_lower_sosend(struct socket *so,
/* Non-blocking io in place out */
goto skip_out_eof;
}
/* What about the INIT, send it maybe */
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
queue_only = 1;
}
}
if ((net->flight_size > net->cwnd) &&
(asoc->sctp_cmt_on_off == 0)) {
SCTP_STAT_INCR(sctps_send_cwnd_avoid);
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2)) {
if (net->flight_size > (2 * net->mtu)) {
queue_only = 1;
} else {
queue_only = 0;
}
asoc->ifp_had_enobuf = 0;
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
if (net->flight_size > net->cwnd) {
queue_only = 1;
SCTP_STAT_INCR(sctps_send_cwnd_avoid);
} else {
queue_only = 0;
}
}
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
(stcb->asoc.total_flight > 0) &&
(stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
@ -13098,7 +13069,6 @@ sctp_lower_sosend(struct socket *so,
SCTP_STAT_INCR(sctps_naglesent);
nagle_applies = 0;
}
/* What about the INIT, send it maybe */
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
@ -13107,22 +13077,8 @@ sctp_lower_sosend(struct socket *so,
stcb->asoc.total_flight,
stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
}
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only_for_init = 0;
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
queue_only_for_init = 0;
queue_only = 1;
}
}
if (queue_only_for_init)
queue_only_for_init = 0;
if ((queue_only == 0) && (nagle_applies == 0)) {
/*-
* need to start chunk output
@ -13215,7 +13171,7 @@ sctp_lower_sosend(struct socket *so,
if (uio->uio_resid == 0) {
got_all_of_the_send = 1;
}
} else if (top) {
} else {
/* We send in a 0, since we do NOT have any locks */
error = sctp_msg_append(stcb, net, top, srcv, 0);
top = NULL;
@ -13326,29 +13282,33 @@ sctp_lower_sosend(struct socket *so,
if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
some_on_control = 1;
}
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
queue_only = 1;
}
}
if ((net->flight_size > net->cwnd) &&
(stcb->asoc.sctp_cmt_on_off == 0)) {
SCTP_STAT_INCR(sctps_send_cwnd_avoid);
queue_only = 1;
} else if (asoc->ifp_had_enobuf) {
SCTP_STAT_INCR(sctps_ifnomemqueued);
if (net->flight_size > (net->mtu * 2)) {
if (net->flight_size > (2 * net->mtu)) {
queue_only = 1;
} else {
queue_only = 0;
}
asoc->ifp_had_enobuf = 0;
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
} else {
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
if (net->flight_size > net->cwnd) {
queue_only = 1;
SCTP_STAT_INCR(sctps_send_cwnd_avoid);
} else {
queue_only = 0;
}
}
un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
(stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
(stcb->asoc.total_flight > 0) &&
(stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
@ -13371,22 +13331,15 @@ sctp_lower_sosend(struct socket *so,
SCTP_STAT_INCR(sctps_naglesent);
nagle_applies = 0;
}
if (queue_only_for_init) {
if (hold_tcblock == 0) {
SCTP_TCB_LOCK(stcb);
hold_tcblock = 1;
}
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
/* a collision took us forward? */
queue_only_for_init = 0;
queue_only = 0;
} else {
sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
queue_only_for_init = 0;
queue_only = 1;
}
if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
nagle_applies, un_sent);
sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
stcb->asoc.total_flight,
stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
}
if (queue_only_for_init)
queue_only_for_init = 0;
if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
/* we can attempt to send too. */
if (hold_tcblock == 0) {