From 06e868066e3b5828383eb40ff4d1c0029100b0b5 Mon Sep 17 00:00:00 2001 From: Lucas Nussbaum Date: Fri, 13 Feb 2009 08:33:41 +0000 Subject: sctp: Allow to disable SCTP checksums via module parameter This is a new version of my patch, now using a module parameter instead of a sysctl, so that the option is harder to find. Please note that, once the module is loaded, it is still possible to change the value of the parameter in /sys/module/sctp/parameters/, which is useful if you want to do performance comparisons without rebooting. Computation of SCTP checksums significantly affects the performance of SCTP. For example, using two dual-Opteron 246 connected using a Gbe network, it was not possible to achieve more than ~730 Mbps, compared to 941 Mbps after disabling SCTP checksums. Unfortunately, SCTP checksum offloading in NICs is not commonly available (yet). By default, checksums are still enabled, of course. Signed-off-by: Lucas Nussbaum Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- net/sctp/input.c | 3 ++- net/sctp/output.c | 2 +- net/sctp/protocol.c | 2 ++ 3 files changed, 5 insertions(+), 2 deletions(-) (limited to 'net') diff --git a/net/sctp/input.c b/net/sctp/input.c index 2e4a8646dbc3..693fd0804810 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -142,7 +142,8 @@ int sctp_rcv(struct sk_buff *skb) __skb_pull(skb, skb_transport_offset(skb)); if (skb->len < sizeof(struct sctphdr)) goto discard_it; - if (!skb_csum_unnecessary(skb) && sctp_rcv_checksum(skb) < 0) + if (!sctp_checksum_disable && !skb_csum_unnecessary(skb) && + sctp_rcv_checksum(skb) < 0) goto discard_it; skb_pull(skb, sizeof(struct sctphdr)); diff --git a/net/sctp/output.c b/net/sctp/output.c index 47bfba6c03ec..2d65b7a7330b 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -531,7 +531,7 @@ int sctp_packet_transmit(struct sctp_packet *packet) * Note: Adler-32 is no longer applicable, as has been replaced * by CRC32-C as described in . */ - if (!(dst->dev->features & NETIF_F_NO_CSUM)) { + if (!sctp_checksum_disable && !(dst->dev->features & NETIF_F_NO_CSUM)) { crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len); crc32 = sctp_end_cksum(crc32); } else diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index b78e3be69013..cc0b592698f9 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -1411,4 +1411,6 @@ MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); MODULE_AUTHOR("Linux Kernel SCTP developers "); MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); +module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); +MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); MODULE_LICENSE("GPL"); -- cgit v1.2.3