netdev - [PATCH net-next-2.6] ifb: add performance flags to dev->features

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Date:	Mon, 20 Dec 2010 15:25:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>, David Miller <davem@...emloft.net>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	Paweł Staszewski <pstaszewski@...are.pl>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: [PATCH net-next-2.6] ifb: add performance flags to dev->features

Le lundi 20 décembre 2010 à 22:05 +0800, Changli Gao a écrit :
> 2010/12/20 Jarek Poplawski <jarkao2@...il.com>:
> >
> > IMHO it should, (probably even more, like loopback) but we should
> > consider mirred can xmit to other than ifb too.
> >
> 
> I also think so. And when making ifb a multiqueue NIC, I tried to add
> these dev features to ifb. :)
> 

This has litle to do with your multiqueue work,
its more an effect of GRO being more and more deployed.

I dont see dev->features being changed in one of your previous patches.
I did dummy case in commit 6d81f41c58c6

[PATCH net-next-2.6] ifb: add performance flags to dev->features

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 unecessary split of some packets (GRO for example)

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 |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 124dac4..c761551 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -136,6 +136,9 @@ static void ifb_setup(struct net_device *dev)
 	ether_setup(dev);
 	dev->tx_queue_len = TX_Q_LIMIT;
 
+	dev->features |= NETIF_F_NO_CSUM | NETIF_F_SG |
+			 NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
+			 NETIF_F_TSO;
 	dev->flags |= IFF_NOARP;
 	dev->flags &= ~IFF_MULTICAST;
 	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;


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