netdev - Re: [PATCH net-next v2 5/7] qlcnic: fix TSO race condition

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Date:	Wed, 17 Apr 2013 11:36:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shahed Shaikh <shahed.shaikh@...gic.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Dept_NX_Linux_NIC_Driver@...gic.com,
	Sritej Velaga <sritej.velaga@...gic.com>
Subject: Re: [PATCH net-next v2 5/7] qlcnic: fix TSO race condition

On Wed, 2013-04-17 at 13:05 -0400, Shahed Shaikh wrote:
> From: Sritej Velaga <sritej.velaga@...gic.com>
> 
> When driver receives a packet with gso size > 0 and when TSO is disabled,
> it should be transmitted as a TSO packet to prevent Tx timeout and subsequent
> firmware reset.
> 
> Signed-off-by: Sritej Velaga <sritej.velaga@...gic.com>
> Signed-off-by: Shahed Shaikh <shahed.shaikh@...gic.com>
> ---
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
> index a85ca63..910346d 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
> @@ -362,8 +362,7 @@ set_flags:
>  		memcpy(&first_desc->eth_addr, skb->data, ETH_ALEN);
>  	}
>  	opcode = TX_ETHER_PKT;
> -	if ((adapter->netdev->features & (NETIF_F_TSO | NETIF_F_TSO6)) &&
> -	    skb_shinfo(skb)->gso_size > 0) {
> +	if (skb_is_gso(skb)) {
>  		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
>  		first_desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
>  		first_desc->total_hdr_length = hdr_len;

Acked-by: Eric Dumazet <edumazet@...gle.com>

But its a real bug fix, targeted for net tree I presume.



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