[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 <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 6b6c3adfcf00..6a6aa537b7aa 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 }
 };