netdev - RE: [PATCH] s2io LRO bugs

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Date:	Mon, 14 Jan 2008 16:33:03 -0500
From:	"Ramkrishna Vepa" <Ramkrishna.Vepa@...erion.com>
To:	"Al Viro" <viro@....linux.org.uk>, <jgarzik@...ox.com>
Cc:	<netdev@...r.kernel.org>
Subject: RE: [PATCH] s2io LRO bugs

Al,
Thanks for finding this. We have a few patches lined up and will submit
this patch.

Ram

> -----Original Message-----
> From: netdev-owner@...r.kernel.org
[mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Al Viro
> Sent: Sunday, December 23, 2007 10:15 PM
> To: jgarzik@...ox.com
> Cc: netdev@...r.kernel.org; Ravinandan.Arakali@...erion.com
> Subject: [PATCH] s2io LRO bugs
> 
> a) initiate_new_session() sets ->tcp_ack to ntohl(...); everything
>    else stores and expects to find there the net-endian value.
> b) check for monotonic timestamps in verify_l3_l4_lro_capable()
>    compares the value sitting in TCP option (right there in the
skb->data,
>    net-endian 32bit) with the value picked from earlier packet.
>    Doing that without ntohl() is an interesting idea and it might even
>    work occasionally; unfortunately, it's quite broken.
> 
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> ---
>  drivers/net/s2io.c |   20 ++++++++++----------
>  drivers/net/s2io.h |    2 +-
>  2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
> index 9d80f1c..aef0875 100644
> --- a/drivers/net/s2io.c
> +++ b/drivers/net/s2io.c
> @@ -7898,7 +7898,7 @@ static void initiate_new_session(struct lro
*lro, u8
> *l2h,
>  	lro->iph = ip;
>  	lro->tcph = tcp;
>  	lro->tcp_next_seq = tcp_pyld_len + ntohl(tcp->seq);
> -	lro->tcp_ack = ntohl(tcp->ack_seq);
> +	lro->tcp_ack = tcp->ack_seq;
>  	lro->sg_num = 1;
>  	lro->total_len = ntohs(ip->tot_len);
>  	lro->frags_len = 0;
> @@ -7907,10 +7907,10 @@ static void initiate_new_session(struct lro
*lro,
> u8 *l2h,
>  	 * already been done.
>   	 */
>  	if (tcp->doff == 8) {
> -		u32 *ptr;
> -		ptr = (u32 *)(tcp+1);
> +		__be32 *ptr;
> +		ptr = (__be32 *)(tcp+1);
>  		lro->saw_ts = 1;
> -		lro->cur_tsval = *(ptr+1);
> +		lro->cur_tsval = ntohl(*(ptr+1));
>  		lro->cur_tsecr = *(ptr+2);
>  	}
>  	lro->in_use = 1;
> @@ -7936,7 +7936,7 @@ static void update_L3L4_header(struct s2io_nic
*sp,
> struct lro *lro)
> 
>  	/* Update tsecr field if this session has timestamps enabled */
>  	if (lro->saw_ts) {
> -		u32 *ptr = (u32 *)(tcp + 1);
> +		__be32 *ptr = (__be32 *)(tcp + 1);
>  		*(ptr+2) = lro->cur_tsecr;
>  	}
> 
> @@ -7961,10 +7961,10 @@ static void aggregate_new_rx(struct lro *lro,
> struct iphdr *ip,
>  	lro->window = tcp->window;
> 
>  	if (lro->saw_ts) {
> -		u32 *ptr;
> +		__be32 *ptr;
>  		/* Update tsecr and tsval from this packet */
> -		ptr = (u32 *) (tcp + 1);
> -		lro->cur_tsval = *(ptr + 1);
> +		ptr = (__be32 *) (tcp + 1);
> +		lro->cur_tsval = ntohl(*(ptr + 1));
>  		lro->cur_tsecr = *(ptr + 2);
>  	}
>  }
> @@ -8015,11 +8015,11 @@ static int verify_l3_l4_lro_capable(struct lro
> *l_lro, struct iphdr *ip,
> 
>  		/* Ensure timestamp value increases monotonically */
>  		if (l_lro)
> -			if (l_lro->cur_tsval > *((u32 *)(ptr+2)))
> +			if (l_lro->cur_tsval > ntohl(*((__be32
*)(ptr+2))))
>  				return -1;
> 
>  		/* timestamp echo reply should be non-zero */
> -		if (*((u32 *)(ptr+6)) == 0)
> +		if (*((__be32 *)(ptr+6)) == 0)
>  			return -1;
>  	}
> 
> diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h
> index cc1797a..899d60c 100644
> --- a/drivers/net/s2io.h
> +++ b/drivers/net/s2io.h
> @@ -797,7 +797,7 @@ struct lro {
>  	int		in_use;
>  	__be16		window;
>  	u32		cur_tsval;
> -	u32		cur_tsecr;
> +	__be32		cur_tsecr;
>  	u8		saw_ts;
>  };
> 
> --
> 1.5.3.GIT
> 
> --
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