Commit 95937825 authored by Chris Leech's avatar Chris Leech Committed by David S. Miller
Browse files

[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: default avatarChris Leech <christopher.leech@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 624d1164

include/linux/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

include/net/tcp.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

net/core/user_dma.c

+4 −0
Original line number Diff line number Diff line
@@ -30,6 +30,10 @@ 
#include <linux/rtnetlink.h> /* for BUG_TRAP */

#include <net/tcp.h>



#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

net/ipv4/sysctl_net_ipv4.c

+10 −0
Original line number Diff line number Diff line
@@ -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 }

};