[PATCH] iw_cxgb4: fix the calculation of ipv6 header size

[PATCH] iw_cxgb4: fix the calculation of ipv6 header size

[Ganesh Goudar]

From: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>

Take care of ipv6 checks while computing header length for deducing mtu
size of ipv6 servers. Due to the incorrect header length computation for
ipv6 servers, wrong mss is reported to the peer (client).

Signed-off-by: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Ganesh Goudar <ganeshgr-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
---
 drivers/infiniband/hw/cxgb4/cm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index b6fe459..b54e184 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -2517,7 +2517,8 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
 		goto reject;
 	}
 
-	hdrs = sizeof(struct iphdr) + sizeof(struct tcphdr) +
+	hdrs = ((iptype == 4) ? sizeof(struct iphdr) : sizeof(struct ipv6hdr)) +
+	       sizeof(struct tcphdr) +
 	       ((enable_tcp_timestamps && req->tcpopt.tstamp) ? 12 : 0);
 	if (peer_mss && child_ep->mtu > (peer_mss + hdrs))
 		child_ep->mtu = peer_mss + hdrs;
-- 
2.1.0

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RE: [PATCH] iw_cxgb4: fix the calculation of ipv6 header size

[Steve Wise]

> From: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> 
> Take care of ipv6 checks while computing header length for deducing mtu
> size of ipv6 servers. Due to the incorrect header length computation for
> ipv6 servers, wrong mss is reported to the peer (client).
> 
> Signed-off-by: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> Signed-off-by: Ganesh Goudar <ganeshgr-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>

Acked-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>

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Re: [PATCH] iw_cxgb4: fix the calculation of ipv6 header size

[Doug Ledford]

On Wed, 2017-05-31 at 09:09 -0500, Steve Wise wrote:
> > 
> > From: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> > 
> > Take care of ipv6 checks while computing header length for deducing
> > mtu
> > size of ipv6 servers. Due to the incorrect header length
> > computation for
> > ipv6 servers, wrong mss is reported to the peer (client).
> > 
> > Signed-off-by: Raju Rangoju <rajur-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> > Signed-off-by: Ganesh Goudar <ganeshgr-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> 
> Acked-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>

Thanks, applied.

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