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| author | Ian McDonald <ian.mcdonald@jandi.co.nz> | 2006-11-20 18:30:17 -0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:24:37 -0800 |
| commit | b1308dc015eb09cf094ca169296738a13ae049ad (patch) | |
| tree | 9c408412fc94671bb7f23b356ef328489c433d1f /net | |
| parent | 56724aa434e9b4d73548021ede7a1474f533f3fe (diff) | |
| download | op-kernel-dev-b1308dc015eb09cf094ca169296738a13ae049ad.zip op-kernel-dev-b1308dc015eb09cf094ca169296738a13ae049ad.tar.gz | |
[DCCP]: Set TX Queue Length Bounds via Sysctl
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dccp/dccp.h | 1 | ||||
| -rw-r--r-- | net/dccp/proto.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 33d86f5..3a94625 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -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) diff --git a/net/dccp/proto.c b/net/dccp/proto.c index 0225bda..a7f345c 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -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); /* |
