From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next 10/16] i40e: check for possible incorrect ipv6 checksum Date: Fri, 10 Jan 2014 00:58:50 -0800 Message-ID: <1389344336-1558-11-git-send-email-jeffrey.t.kirsher@intel.com> References: <1389344336-1558-1-git-send-email-jeffrey.t.kirsher@intel.com> Cc: Shannon Nelson , netdev@vger.kernel.org, gospo@redhat.com, sassmann@redhat.com, Jesse Brandeburg , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from mga11.intel.com ([192.55.52.93]:61393 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750793AbaAJI7G (ORCPT ); Fri, 10 Jan 2014 03:59:06 -0500 In-Reply-To: <1389344336-1558-1-git-send-email-jeffrey.t.kirsher@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Shannon Nelson If the IPV6EXADD bit is set in the Rx descriptor status, there was an optional extension header with an alternate IP address detected. The HW checksum offload doesn't handle the alternate IP address correctly so likely comes up with the wrong answer. Thus, if the bit is set we ignore the checksum offload value. Change-ID: I70ff8d38cdcddccf44107691cae13d0c07c284c8 Signed-off-by: Shannon Nelson Signed-off-by: Jesse Brandeburg Tested-by: Kavindya Deegala Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 4 ++++ drivers/net/ethernet/intel/i40e/i40e_type.h | 4 +++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 43d88dd..946d8b1 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -892,6 +892,10 @@ static inline void i40e_rx_checksum(struct i40e_vsi *vsi, rx_status & (1 << I40E_RX_DESC_STATUS_L3L4P_SHIFT))) return; + /* likely incorrect csum if alternate IP extention headers found */ + if (rx_status & (1 << I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT)) + return; + /* IP or L4 or outmost IP checksum error */ if (rx_error & ((1 << I40E_RX_DESC_ERROR_IPE_SHIFT) | (1 << I40E_RX_DESC_ERROR_L4E_SHIFT) | diff --git a/drivers/net/ethernet/intel/i40e/i40e_type.h b/drivers/net/ethernet/intel/i40e/i40e_type.h index 072c850..80cf240 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_type.h +++ b/drivers/net/ethernet/intel/i40e/i40e_type.h @@ -499,7 +499,9 @@ enum i40e_rx_desc_status_bits { I40E_RX_DESC_STATUS_FLM_SHIFT = 11, I40E_RX_DESC_STATUS_FLTSTAT_SHIFT = 12, /* 2 BITS */ I40E_RX_DESC_STATUS_LPBK_SHIFT = 14, - I40E_RX_DESC_STATUS_UDP_0_SHIFT = 16 + I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT = 15, + I40E_RX_DESC_STATUS_RESERVED_SHIFT = 16, /* 2 BITS */ + I40E_RX_DESC_STATUS_UDP_0_SHIFT = 18 }; #define I40E_RXD_QW1_STATUS_TSYNINDX_SHIFT I40E_RX_DESC_STATUS_TSYNINDX_SHIFT -- 1.8.3.1