[dpdk-dev] [PATCH] net/i40e: fix X710 Rx issue after reading some registers

[Beilei Xing <beilei.xing@intel.com>]

There's an issue that X710 can't receive any packet after
reading some special registers. That's because these
registers are only valid for X722, read access for non-X722
will cause ECC error.

Fixes: d9efd0136ac1 ("i40e: add EEPROM and registers dumping")
Cc: stable@dpdk.org

Signed-off-by: Beilei Xing <beilei.xing@intel.com>
---
 drivers/net/i40e/i40e_ethdev.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 1c77906..686227e 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -11609,6 +11609,31 @@ i40e_dev_rx_queue_intr_disable(struct rte_eth_dev *dev, uint16_t queue_id)
 	return 0;
 }
 
+/**
+ * This function is used to check if the register is valid for non-X722 NIC.
+ * Below is the valid registers list for X722 only:
+ * 0x2b800--0x2bb00
+ * 0x38700--0x38a00
+ * 0x3d800--0x3db00
+ * 0x208e00--0x209000
+ * 0x20be00--0x20c000
+ * 0x263c00--0x264000
+ * 0x265c00--0x266000
+ */
+static inline int i40e_valid_regs(uint32_t reg_offset)
+{
+	if (((reg_offset >= 0x2b800) && (reg_offset <= 0x2bb00)) ||
+	    ((reg_offset >= 0x38700) && (reg_offset <= 0x38a00)) ||
+	    ((reg_offset >= 0x3d800) && (reg_offset <= 0x3db00)) ||
+	    ((reg_offset >= 0x208e00) && (reg_offset <= 0x209000)) ||
+	    ((reg_offset >= 0x20be00) && (reg_offset <= 0x20c000)) ||
+	    ((reg_offset >= 0x263c00) && (reg_offset <= 0x264000)) ||
+	    ((reg_offset >= 0x265c00) && (reg_offset <= 0x266000)))
+		return 0;
+	else
+		return 1;
+}
+
 static int i40e_get_regs(struct rte_eth_dev *dev,
 			 struct rte_dev_reg_info *regs)
 {
@@ -11650,8 +11675,12 @@ static int i40e_get_regs(struct rte_eth_dev *dev,
 				reg_offset = arr_idx * reg_info->stride1 +
 					arr_idx2 * reg_info->stride2;
 				reg_offset += reg_info->base_addr;
-				ptr_data[reg_offset >> 2] =
-					I40E_READ_REG(hw, reg_offset);
+				if ((hw->mac.type != I40E_MAC_X722) &&
+				    !i40e_valid_regs(reg_offset))
+					ptr_data[reg_offset >> 2] = 0;
+				else
+					ptr_data[reg_offset >> 2] =
+						I40E_READ_REG(hw, reg_offset);
 			}
 	}
 
-- 
2.5.5