From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladislav Yasevich Subject: [PATCH] tg3: Work around HW/FW limitations with vlan encapsulated frames Date: Thu, 18 Sep 2014 10:31:17 -0400 Message-ID: <1411050677-28147-1-git-send-email-vyasevic@redhat.com> Cc: Vladislav Yasevich , Prashant Sreedharan , Michael Chan To: netdev@vger.kernel.org Return-path: Received: from mail-qg0-f51.google.com ([209.85.192.51]:62179 "EHLO mail-qg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755682AbaIROb1 (ORCPT ); Thu, 18 Sep 2014 10:31:27 -0400 Received: by mail-qg0-f51.google.com with SMTP id e89so1186387qgf.24 for ; Thu, 18 Sep 2014 07:31:27 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: TG3 appears to have an issue performing TSO and checksum offloading correclty when the frame has been vlan encapsulated (non-accelrated). In these cases, tcp checksum is not correctly updated. This patch attempts to work around this issue. After the patch, 802.1ad vlans start working correctly over tg3 devices. CC: Prashant Sreedharan CC: Michael Chan Signed-off-by: Vladislav Yasevich --- drivers/net/ethernet/broadcom/tg3.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index cb77ae9..e7d3a62 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -7914,8 +7914,6 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev) entry = tnapi->tx_prod; base_flags = 0; - if (skb->ip_summed == CHECKSUM_PARTIAL) - base_flags |= TXD_FLAG_TCPUDP_CSUM; mss = skb_shinfo(skb)->gso_size; if (mss) { @@ -7929,6 +7927,13 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev) hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb) - ETH_HLEN; + /* HW/FW can not correctly segment packets that have been + * vlan encapsulated. + */ + if (skb->protocol == htons(ETH_P_8021Q) || + skb->protocol == htons(ETH_P_8021AD)) + return tg3_tso_bug(tp, tnapi, txq, skb); + if (!skb_is_gso_v6(skb)) { if (unlikely((ETH_HLEN + hdr_len) > 80) && tg3_flag(tp, TSO_BUG)) @@ -7979,6 +7984,17 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev) base_flags |= tsflags << 12; } } + } else if (skb->ip_summed == CHECKSUM_PARTIAL) { + /* HW/FW can not correctly checksum packets that have been + * vlan encapsulated. + */ + if (skb->protocol == htons(ETH_P_8021Q) || + skb->protocol == htons(ETH_P_8021AD)) { + if (skb_checksum_help(skb)) + goto drop; + } else { + base_flags |= TXD_FLAG_TCPUDP_CSUM; + } } if (tg3_flag(tp, USE_JUMBO_BDFLAG) && -- 1.9.3