path: root/net/ipv4/tunnel4.c
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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/ipv4/tunnel4.c
parentsctp: implement prsctp RTX policy (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/ipv4/tunnel4.c')
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