From mboxrd@z Thu Jan 1 00:00:00 1970 From: vyasevich@gmail.com Subject: [PATCH 8/8] qlge: Fix TSO for non-accelerated vlan traffic Date: Fri, 22 Aug 2014 22:17:10 -0400 Message-ID: <1408760230-7457-9-git-send-email-vysevich@gmail.com> References: <1408760230-7457-1-git-send-email-vysevich@gmail.com> Cc: Vladislav Yasevich , Shahed Shaikh , Jitendra Kalsaria , Ron Mercer , linux-driver@qlogic.com To: netdev@vger.kernel.org Return-path: Received: from mail-qa0-f41.google.com ([209.85.216.41]:57242 "EHLO mail-qa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751750AbaHWCRk (ORCPT ); Fri, 22 Aug 2014 22:17:40 -0400 Received: by mail-qa0-f41.google.com with SMTP id j7so10483854qaq.0 for ; Fri, 22 Aug 2014 19:17:39 -0700 (PDT) In-Reply-To: <1408760230-7457-1-git-send-email-vysevich@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Vladislav Yasevich This device claims TSO support for vlans. It also allows a user to control vlan acceleration offloading. As such, it is possible to turn off vlan acceleration and configure a vlan which will continue to send TSO traffic. In such situation the packet passed down the the device will contain a vlan header and skb->protocol will be set to ETH_P_8021Q. The device assumes that skb->protocol contains network protocol value and uses that value to set up TSO information. This results in corrupted frames sent on the wire. This patch extracts the protocol value correctly by using a vlan_get_protocol() helper and corrects corrupt TSO frames. CC: Shahed Shaikh CC: Jitendra Kalsaria CC: Ron Mercer CC: linux-driver@qlogic.com Signed-off-by: Vladislav Yasevich --- drivers/net/ethernet/qlogic/qlge/qlge_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c index 188626e..3e96f26 100644 --- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c +++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c @@ -2556,6 +2556,7 @@ static int ql_tso(struct sk_buff *skb, struct ob_mac_tso_iocb_req *mac_iocb_ptr) if (skb_is_gso(skb)) { int err; + __be16 l3_proto = vlan_get_protocol(skb); err = skb_cow_head(skb, 0); if (err < 0) @@ -2572,7 +2573,7 @@ static int ql_tso(struct sk_buff *skb, struct ob_mac_tso_iocb_req *mac_iocb_ptr) << OB_MAC_TRANSPORT_HDR_SHIFT); mac_iocb_ptr->mss = cpu_to_le16(skb_shinfo(skb)->gso_size); mac_iocb_ptr->flags2 |= OB_MAC_TSO_IOCB_LSO; - if (likely(skb->protocol == htons(ETH_P_IP))) { + if (likely(l3_proto == htons(ETH_P_IP))) { struct iphdr *iph = ip_hdr(skb); iph->check = 0; mac_iocb_ptr->flags1 |= OB_MAC_TSO_IOCB_IP4; @@ -2580,7 +2581,7 @@ static int ql_tso(struct sk_buff *skb, struct ob_mac_tso_iocb_req *mac_iocb_ptr) iph->daddr, 0, IPPROTO_TCP, 0); - } else if (skb->protocol == htons(ETH_P_IPV6)) { + } else if (l3_proto == htons(ETH_P_IPV6)) { mac_iocb_ptr->flags1 |= OB_MAC_TSO_IOCB_IP6; tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, -- 1.9.3