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    Subject[PATCH 8/9] [I/OAT] Add a sysctl for tuning the I/OAT offloaded I/O threshold
    Date
    Any socket recv of less than this ammount will not be offloaded

    Signed-off-by: Chris Leech <christopher.leech@intel.com>
    ---

    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(+), 0 deletions(-)

    diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
    index 76eaeff..cd9e7c0 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 ca5bdaf..2e6fdef 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 ec177ef..642a3f3 100644
    --- a/net/core/user_dma.c
    +++ b/net/core/user_dma.c
    @@ -33,6 +33,10 @@

    #ifdef CONFIG_NET_DMA

    +#define NET_DMA_DEFAULT_COPYBREAK 1024
    +
    +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 6b6c3ad..6a6aa53 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 }
    };

    -
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