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authorXin Long <lucien.xin@gmail.com>2016-07-09 19:47:45 +0800
committerDavid S. Miller <davem@davemloft.net>2016-07-11 13:25:39 -0700
commit8dbdf1f5b09cb22560e7c7173b52fe3c631046bd (patch)
treecb51b8283e24aa2ed014dbbc621a2dc86f9c91de /net/sctp/socket.c
parent01aadb3af6e1b10970c1f7e510b5097c8f725d64 (diff)
sctp: implement prsctp PRIO policy
prsctp PRIO policy is a policy to abandon lower priority chunks when asoc doesn't have enough snd buffer, so that the current chunk with higher priority can be queued successfully. Similar to TTL/RTX policy, we will set the priority of the chunk to prsctp_param with sinfo->sinfo_timetolive in sctp_set_prsctp_policy(). So if PRIO policy is enabled, msg->expire_at won't work. asoc->sent_cnt_removable will record how many chunks can be checked to remove. If priority policy is enabled, when the chunk is queued into the out_queue, we will increase sent_cnt_removable. When the chunk is moved to abandon_queue or dequeue and free, we will decrease sent_cnt_removable. In sctp_sendmsg, we will check if there is enough snd buffer for current msg and if sent_cnt_removable is not 0. Then try to abandon chunks in sctp_prune_prsctp when sendmsg from the retransmit/transmited queue, and free chunks from out_queue in right order until the abandon+free size > msg_len - sctp_wfree. For the abandon size, we have to wait until it sends FORWARD TSN, receives the sack and the chunks are really freed. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/socket.c')
-rw-r--r--net/sctp/socket.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 08614296628a..71c7dc5ea62e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1914,6 +1914,9 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
goto out_free;
}
+ if (sctp_wspace(asoc) < msg_len)
+ sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
+
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
if (!sctp_wspace(asoc)) {
err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);