netdev - Re: [PATCH] sky2: rx hash offload

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Date:	Mon, 05 Apr 2010 18:14:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: rx hash offload

Le lundi 05 avril 2010 à 08:48 -0700, Stephen Hemminger a écrit :
> Marvell Yukon 2 hardware supports hardware receive hash calculation.
> Now that Receive Packet Steering is available, add support
> to enable it.
> 
> Note: still experimental, tested on only a few variants.
> No performance testing has been done.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> 
> ---
>  drivers/net/sky2.c |   75 +++++++++++++++++++++++++++++++++++++++++++++++++++--
>  drivers/net/sky2.h |   23 ++++++++++++++++
>  2 files changed, 96 insertions(+), 2 deletions(-)
> 

Cool :)

I believe some bits are needed in receive_copy() to transfert rxhash to
new skb ?


diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index d8ec4c1..f420255 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2295,6 +2295,8 @@ static struct sk_buff *receive_copy(struct sky2_port *sky2,
                skb_copy_from_linear_data(re->skb, skb->data, length);
                skb->ip_summed = re->skb->ip_summed;
                skb->csum = re->skb->csum;
+               skb->rxhash = re->skb->rxhash;
+               re->skb->rxhash = 0;
                pci_dma_sync_single_for_device(sky2->hw->pdev, re->data_addr,
                                               length, PCI_DMA_FROMDEVICE);
                re->skb->ip_summed = CHECKSUM_NONE;


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