netdev - [PATCH v2 net-next-2.6] ifb: add performance flags

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Message-ID: <1293999876.2535.211.camel@edumazet-laptop>
Date:	Sun, 02 Jan 2011 21:24:36 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, xiaosuo@...il.com,
	pstaszewski@...are.pl, netdev@...r.kernel.org
Subject: [PATCH v2 net-next-2.6] ifb: add performance flags

Le mercredi 29 décembre 2010 à 00:07 +0100, Jarek Poplawski a écrit :

> Ingress is before vlans handler so these features and the
> NETIF_F_HW_VLAN_TX flag seem useful for ifb considering
> dev_hard_start_xmit() checks.

OK, here is v2 of the patch then, thanks everybody.


[PATCH v2 net-next-2.6] ifb: add performance flags

IFB can use the full set of features flags (NETIF_F_SG |
NETIF_F_FRAGLIST | NETIF_F_TSO | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA) to
avoid unnecessary split of some packets (GRO for example)

Changli suggested to also set vlan_features,
Jarek suggested to add NETIF_F_HW_VLAN_TX as well.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Changli Gao <xiaosuo@...il.com>
Cc: Jarek Poplawski <jarkao2@...il.com>
Cc: Pawel Staszewski <pstaszewski@...are.pl>
---
 drivers/net/ifb.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 124dac4..66ca7bf 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -126,6 +126,9 @@ static const struct net_device_ops ifb_netdev_ops = {
 	.ndo_validate_addr = eth_validate_addr,
 };
 
+#define IFB_FEATURES (NETIF_F_NO_CSUM | NETIF_F_SG  | NETIF_F_FRAGLIST | \
+		      NETIF_F_HIGHDMA | NETIF_F_TSO | NETIF_F_HW_VLAN_TX)
+
 static void ifb_setup(struct net_device *dev)
 {
 	/* Initialize the device structure. */
@@ -136,6 +139,9 @@ static void ifb_setup(struct net_device *dev)
 	ether_setup(dev);
 	dev->tx_queue_len = TX_Q_LIMIT;
 
+	dev->features |= IFB_FEATURES;
+	dev->vlan_features |= IFB_FEATURES;
+
 	dev->flags |= IFF_NOARP;
 	dev->flags &= ~IFF_MULTICAST;
 	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;


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