From 9593782585e0cf70babe787a8463d492a68b1744 Mon Sep 17 00:00:00 2001 From: Chris Leech Date: Tue, 23 May 2006 18:02:55 -0700 Subject: [PATCH] [I/OAT]: Add a sysctl for tuning the I/OAT offloaded I/O threshold Any socket recv of less than this ammount will not be offloaded Signed-off-by: Chris Leech Signed-off-by: David S. Miller --- include/linux/sysctl.h | 1 + include/net/tcp.h | 1 + net/core/user_dma.c | 4 ++++ net/ipv4/sysctl_net_ipv4.c | 10 ++++++++++ 4 files changed, 16 insertions(+) diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h index 76eaeff76f..cd9e7c0825 100644 --- a/include/linux/sysctl.h +++ b/include/linux/sysctl.h @@ -403,6 +403,7 @@ enum NET_TCP_MTU_PROBING=113, NET_TCP_BASE_MSS=114, NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS=115, + NET_TCP_DMA_COPYBREAK=116, }; enum { diff --git a/include/net/tcp.h b/include/net/tcp.h index 578cccf275..f1f472746e 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -219,6 +219,7 @@ extern int sysctl_tcp_adv_win_scale; extern int sysctl_tcp_tw_reuse; extern int sysctl_tcp_frto; extern int sysctl_tcp_low_latency; +extern int sysctl_tcp_dma_copybreak; extern int sysctl_tcp_nometrics_save; extern int sysctl_tcp_moderate_rcvbuf; extern int sysctl_tcp_tso_win_divisor; diff --git a/net/core/user_dma.c b/net/core/user_dma.c index 9eee91bcbf..b7c98dbcdb 100644 --- a/net/core/user_dma.c +++ b/net/core/user_dma.c @@ -30,6 +30,10 @@ #include /* for BUG_TRAP */ #include +#define NET_DMA_DEFAULT_COPYBREAK 4096 + +int sysctl_tcp_dma_copybreak = NET_DMA_DEFAULT_COPYBREAK; + /** * dma_skb_copy_datagram_iovec - Copy a datagram to an iovec. * @skb - buffer to copy diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 6b6c3adfcf..6a6aa537b7 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -688,6 +688,16 @@ ctl_table ipv4_table[] = { .mode = 0644, .proc_handler = &proc_dointvec }, +#ifdef CONFIG_NET_DMA + { + .ctl_name = NET_TCP_DMA_COPYBREAK, + .procname = "tcp_dma_copybreak", + .data = &sysctl_tcp_dma_copybreak, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec + }, +#endif { .ctl_name = 0 } }; -- 2.39.5