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author | Xin Long <lucien.xin@gmail.com> | 2016-07-09 11:47:45 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2016-07-11 20:25:39 (GMT) |
commit | 8dbdf1f5b09cb22560e7c7173b52fe3c631046bd (patch) | |
tree | cb51b8283e24aa2ed014dbbc621a2dc86f9c91de /net/sctp/chunk.c | |
parent | 01aadb3af6e1b10970c1f7e510b5097c8f725d64 (diff) | |
download | linux-8dbdf1f5b09cb22560e7c7173b52fe3c631046bd.tar.xz |
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/chunk.c')
-rw-r--r-- | net/sctp/chunk.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c index b3692b5..a55e547 100644 --- a/net/sctp/chunk.c +++ b/net/sctp/chunk.c @@ -360,6 +360,7 @@ int sctp_chunk_abandoned(struct sctp_chunk *chunk) chunk->asoc->abandoned_sent[SCTP_PR_INDEX(RTX)]++; return 1; } + /* PRIO policy is processed by sendmsg, not here */ return 0; } |