From 8ee75a8ed01415b4d112715ff369d2a6b1d47aa8 Mon Sep 17 00:00:00 2001 From: Shannon Nelson Date: Sat, 21 Dec 2013 05:44:46 +0000 Subject: [PATCH] i40e: check for possible incorrect ipv6 checksum 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 43d88dd66ed4..946d8b1d9a4d 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 072c8508706b..80cf24020f17 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