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sctp: Tag messages that can be Nagle delayed at creation. 

When we create the sctp_datamsg and fragment the user data,
we know exactly if we are sending full segments or not and
how they might be bundled.  During this time, we can mark
messages a Nagle capable or not.  This makes the check at
transmit time much simpler.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Vlad Yasevich 2010-04-30 22:41:10 -04:00
parent bfa0d9843a
commit 0e3aef8d09
3 changed files with 6 additions and 8 deletions
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8
include/net/sctp/structs.h
View File

@ -643,17 +643,15 @@ struct sctp_pf {
struct sctp_datamsg {
/* Chunks waiting to be submitted to lower layer. */
struct list_head chunks;
/* Chunks that have been transmitted. */
size_t msg_size;
/* Reference counting. */
atomic_t refcnt;
/* When is this message no longer interesting to the peer? */
unsigned long expires_at;
/* Did the messenge fail to send? */
int send_error;
char send_failed;
/* Control whether chunks from this message can be abandoned. */
char can_abandon;
u8 send_failed:1,
can_abandon:1, /* can chunks from this message can be abandoned. */
can_delay; /* should this message be Nagle delayed */
};
struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *,

4
net/sctp/chunk.c
View File

@ -58,9 +58,9 @@ static void sctp_datamsg_init(struct sctp_datamsg *msg)
msg->send_failed = 0;
msg->send_error = 0;
msg->can_abandon = 0;
msg->can_delay = 1;
msg->expires_at = 0;
INIT_LIST_HEAD(&msg->chunks);
msg->msg_size = 0;
}
/* Allocate and initialize datamsg. */
@ -157,7 +157,6 @@ static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chu
{
sctp_datamsg_hold(msg);
chunk->msg = msg;
msg->msg_size += chunk->skb->len;
}
@ -247,6 +246,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
if (msg_len >= first_len) {
msg_len -= first_len;
whole = 1;
msg->can_delay = 0;
}
/* How many full sized? How many bytes leftover? */

2
net/sctp/output.c
View File

@ -674,7 +674,7 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
* Don't delay large message writes that may have been
* fragmeneted into small peices.
*/
if ((len < max) && (chunk->msg->msg_size < max)) {
if ((len < max) && chunk->msg->can_delay) {
retval = SCTP_XMIT_NAGLE_DELAY;
goto finish;
}