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sctp: implement memory accounting on tx path 

Now when sending packets, sk_mem_charge() and sk_mem_uncharge() have been
used to set sk_forward_alloc. We just need to call sk_wmem_schedule() to
check if the allocated should be raised, and call sk_mem_reclaim() to
check if the allocated should be reduced when it's under memory pressure.

If sk_wmem_schedule() returns false, which means no memory is allowed to
allocate, it will block and wait for memory to become available.

Note different from tcp, sctp wait_for_buf happens before allocating any
skb, so memory accounting check is done with the whole msg_len before it
too.

Reported-by: Matteo Croce <mcroce@redhat.com>
Tested-by: Matteo Croce <mcroce@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-04-15 17:15:06 +08:00 committed by David S. Miller
parent 93144b0ecd
commit 1033990ac5
1 changed files with 8 additions and 2 deletions
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10
net/sctp/socket.c
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@ -1913,7 +1913,10 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
if (sctp_wspace(asoc) < (int)msg_len) if (sctp_wspace(asoc) < (int)msg_len)
sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc)); sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
if (sctp_wspace(asoc) <= 0) { if (sk_under_memory_pressure(sk))
sk_mem_reclaim(sk);
if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
if (err) if (err)
@ -8930,7 +8933,10 @@ static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
goto do_error; goto do_error;
if (signal_pending(current)) if (signal_pending(current))
goto do_interrupted; goto do_interrupted;
if ((int)msg_len <= sctp_wspace(asoc)) if (sk_under_memory_pressure(sk))
sk_mem_reclaim(sk);
if ((int)msg_len <= sctp_wspace(asoc) &&
sk_wmem_schedule(sk, msg_len))
break; break;
/* Let another process have a go. Since we are going /* Let another process have a go. Since we are going