netdev - [PATCH net-next 7/8] qeth: repair SBAL elements calculation

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Message-Id: <1449833277-69012-8-git-send-email-ubraun@linux.vnet.ibm.com>
Date:	Fri, 11 Dec 2015 12:27:56 +0100
From:	Ursula Braun <ubraun@...ux.vnet.ibm.com>
To:	davem@...emloft.net, mschwid2@...ux.vnet.ibm.com,
	heicars2@...ux.vnet.ibm.com, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org
Cc:	ubraunu@...ux.vnet.ibm.com
Subject: [PATCH net-next 7/8] qeth: repair SBAL elements calculation

When sending skbs, qeth determines the number of qdio SBAL elements
required. If qeth sends a fragmented skb, the SBAL element number
calculation is wrong, because the fragmented data part is added
twice in qeth_l3_tso_elements(). This patch makes sure fragmented
data is handled in qeth_elements_for_frags() only, while
qeth_l3_tso_elements() starts calculation of qdio SBAL elements just
with the linear data part of the skb.

Signed-off-by: Ursula Braun <ubraun@...ux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
---
 drivers/s390/net/qeth_l3_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 10d9d3e..7c8c68c 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2797,7 +2797,7 @@ static inline int qeth_l3_tso_elements(struct sk_buff *skb)
 {
 	unsigned long tcpd = (unsigned long)tcp_hdr(skb) +
 		tcp_hdr(skb)->doff * 4;
-	int tcpd_len = skb->len - (tcpd - (unsigned long)skb->data);
+	int tcpd_len = skb_headlen(skb) - (tcpd - (unsigned long)skb->data);
 	int elements = PFN_UP(tcpd + tcpd_len - 1) - PFN_DOWN(tcpd);
 
 	elements += qeth_get_elements_for_frags(skb);
-- 
2.3.9

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