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Message-ID: <20100328154448.701c89ee@nehalam> Date: Sun, 28 Mar 2010 15:44:48 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: David Miller <davem@...emloft.net> Cc: netdev@...r.kernel.org Subject: [PATCH 1/2] netdev: add support for Receive Side Scaling hash control This adds ethtool and device feature flag to allow control of Receive Side Scaling hashing supported by many modern controllers. Signed-off-by: Stephen Hemminger <shemminger@...tta.com> --- I am working on RSS for sky2 device, but the hardware isn't fully cooperating but thought others might want to use same API. --- a/include/linux/ethtool.h 2010-03-28 14:09:58.611267016 -0700 +++ b/include/linux/ethtool.h 2010-03-28 14:19:45.032516128 -0700 @@ -310,6 +310,7 @@ struct ethtool_perm_addr { enum ethtool_flags { ETH_FLAG_LRO = (1 << 15), /* LRO is enabled */ ETH_FLAG_NTUPLE = (1 << 27), /* N-tuple filters enabled */ + ETH_FLAG_RSS = (1 << 28), /* RSS is enabled */ }; /* The following structures are for supporting RX network flow --- a/include/linux/netdevice.h 2010-03-28 14:12:13.092517615 -0700 +++ b/include/linux/netdevice.h 2010-03-28 14:13:47.232915349 -0700 @@ -785,6 +785,7 @@ struct net_device { #define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */ #define NETIF_F_FCOE_MTU (1 << 26) /* Supports max FCoE MTU, 2158 bytes*/ #define NETIF_F_NTUPLE (1 << 27) /* N-tuple filters supported */ +#define NETIF_F_RSS (1 << 28) /* Receive Side Scaling hash */ /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 --- a/net/core/ethtool.c 2010-03-28 14:12:25.012207457 -0700 +++ b/net/core/ethtool.c 2010-03-28 14:19:41.548521569 -0700 @@ -121,7 +121,7 @@ int ethtool_op_set_ufo(struct net_device * NETIF_F_xxx values in include/linux/netdevice.h */ static const u32 flags_dup_features = - (ETH_FLAG_LRO | ETH_FLAG_NTUPLE); + (ETH_FLAG_LRO | ETH_FLAG_NTUPLE | ETH_FLAG_RSS); u32 ethtool_op_get_flags(struct net_device *dev) { @@ -152,6 +152,11 @@ int ethtool_op_set_flags(struct net_devi features &= ~NETIF_F_NTUPLE; } + if (data & ETH_FLAG_RSS) + features |= NETIF_F_RSS; + else + features &= ~NETIF_F_RSS; + dev->features = features; return 0; } -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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