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tcp: signal POLLOUT when transmitting

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Current tcp senders can wait forever for buffer space as POLLOUT is not
signaled when transmitting data. Signal POLLOUT when transmitting out of
a full tx buffer.
This commit is contained in:
Matheus
2026-10-08 18:39:18 -03:00
parent 9a9740469f
commit 9b8c81a2cf
1 changed files with 3 additions and 0 deletions
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kernel-src/io/net/tcp.c
+3
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@@ -660,6 +660,7 @@ static int tcp_transmitnextsegment(tcb_t *tcb) {
itimer_pause(&tcb->itimer, NULL, NULL); itimer_pause(&tcb->itimer, NULL, NULL);
uint32_t self = ipv4_getnetdevip(tcb->key.peer); uint32_t self = ipv4_getnetdevip(tcb->key.peer);
tcpheader_t *header = tcb->retransmitbuffer; tcpheader_t *header = tcb->retransmitbuffer;
bool was_full = RINGBUFFER_DATACOUNT(&tcb->transmitbuffer) == TCB_RINGBUFFER_SIZE;
tcb->retransmitpacketlen = ringbuffer_read(&tcb->transmitbuffer, header + 1, tcb->sndmss) + sizeof(tcpheader_t); tcb->retransmitpacketlen = ringbuffer_read(&tcb->transmitbuffer, header + 1, tcb->sndmss) + sizeof(tcpheader_t);
__assert(tcb->retransmitpacketlen > sizeof(tcpheader_t)); __assert(tcb->retransmitpacketlen > sizeof(tcpheader_t));
tcp_createheader(header, tcb, tcb->retransmitpacketlen, NULL, 0, CONTROL_ACK | CONTROL_PSH, 0); tcp_createheader(header, tcb, tcb->retransmitpacketlen, NULL, 0, CONTROL_ACK | CONTROL_PSH, 0);
@@ -670,6 +671,8 @@ static int tcp_transmitnextsegment(tcb_t *tcb) {
tcb->lastsend = timekeeper_timefromboot(); tcb->lastsend = timekeeper_timefromboot();
itimer_set(&tcb->itimer, RTO_START_SEC * 1000000, 0); itimer_set(&tcb->itimer, RTO_START_SEC * 1000000, 0);
itimer_resume(&tcb->itimer); itimer_resume(&tcb->itimer);
if (was_full)
poll_event(&tcb->pollheader, POLLOUT);
return error; return error;
} }