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[DCCP]: Set TX Queue Length Bounds via Sysctl

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Previously the transmit queue was unbounded.

This patch:
	* puts a limit on transmit queue length
	  and sends back EAGAIN if the buffer is full
	* sets the TX queue length to a sensible default
	* implements tx buffer sysctls for DCCP

Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Ian McDonald 2006-11-20 18:30:17 -02:00 committed by David S. Miller
parent 56724aa434
commit b1308dc015
2 changed files with 11 additions and 0 deletions
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1
net/dccp/dccp.h
View file

@ -87,6 +87,7 @@ extern int sysctl_dccp_feat_tx_ccid;
extern int sysctl_dccp_feat_ack_ratio;
extern int sysctl_dccp_feat_send_ack_vector;
extern int sysctl_dccp_feat_send_ndp_count;
extern int sysctl_dccp_tx_qlen;
/* is seq1 < seq2 ? */
static inline int before48(const u64 seq1, const u64 seq2)

10
net/dccp/proto.c
View file

@ -52,6 +52,9 @@ struct inet_hashinfo __cacheline_aligned dccp_hashinfo = {
EXPORT_SYMBOL_GPL(dccp_hashinfo);
/* the maximum queue length for tx in packets. 0 is no limit */
int sysctl_dccp_tx_qlen __read_mostly = 5;
void dccp_set_state(struct sock *sk, const int state)
{
const int oldstate = sk->sk_state;
@ -645,6 +648,13 @@ int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
return -EMSGSIZE;
lock_sock(sk);
if (sysctl_dccp_tx_qlen &&
(sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
rc = -EAGAIN;
goto out_release;
}
timeo = sock_sndtimeo(sk, noblock);
/*