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authorEric Dumazet <edumazet@google.com>2014-10-05 13:11:27 -0400
committerDavid S. Miller <davem@davemloft.net>2014-10-06 17:56:28 -0400
commitfcbeb976d7ce783fd58e63e61c196d9a8912b3be (patch)
treec6dde6923e5316b2bfc4bdb04bd6643515cc1598 /include/linux/netdevice.h
parent9d31a7b9f9963e97e067e72ef13492e6ace7d345 (diff)
net: introduce netdevice gso_min_segs attribute
Some TSO engines might have a too heavy setup cost, that impacts performance on hosts sending small bursts (2 MSS per packet). This patch adds a device gso_min_segs, allowing drivers to set a minimum segment size for TSO packets, according to the NIC performance. Tested on a mlx4 NIC, this allows to get a ~110% increase of throughput when sending 2 MSS per packet. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netdevice.h')
-rw-r--r--include/linux/netdevice.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 22d54b9b700d..2df86f50261c 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1416,6 +1416,8 @@ enum netdev_priv_flags {
1416 * @gso_max_size: Maximum size of generic segmentation offload 1416 * @gso_max_size: Maximum size of generic segmentation offload
1417 * @gso_max_segs: Maximum number of segments that can be passed to the 1417 * @gso_max_segs: Maximum number of segments that can be passed to the
1418 * NIC for GSO 1418 * NIC for GSO
1419 * @gso_min_segs: Minimum number of segments that can be passed to the
1420 * NIC for GSO
1419 * 1421 *
1420 * @dcbnl_ops: Data Center Bridging netlink ops 1422 * @dcbnl_ops: Data Center Bridging netlink ops
1421 * @num_tc: Number of traffic classes in the net device 1423 * @num_tc: Number of traffic classes in the net device
@@ -1666,7 +1668,7 @@ struct net_device {
1666 unsigned int gso_max_size; 1668 unsigned int gso_max_size;
1667#define GSO_MAX_SEGS 65535 1669#define GSO_MAX_SEGS 65535
1668 u16 gso_max_segs; 1670 u16 gso_max_segs;
1669 1671 u16 gso_min_segs;
1670#ifdef CONFIG_DCB 1672#ifdef CONFIG_DCB
1671 const struct dcbnl_rtnl_ops *dcbnl_ops; 1673 const struct dcbnl_rtnl_ops *dcbnl_ops;
1672#endif 1674#endif