From: Ian McDonald Date: Mon, 20 Nov 2006 20:30:17 +0000 (-0200) Subject: [DCCP]: Set TX Queue Length Bounds via Sysctl X-Git-Tag: v2.6.20-rc1~34^2~40^2~250 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1308dc015eb09cf094ca169296738a13ae049ad;p=linux-2.6 [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 Signed-off-by: Gerrit Renker Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index 33d86f5313..3a94625a1a 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 0225bdacd3..a7f345c8d0 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); /*