From: Chenmin Sun <chenmin....@intel.com>
1. Fix the lldp stop condition check - for firmware
versions 6.01(for X710)/3.33(for X722) or later we need stop the lldp
2. Doucment known issue for tx bytes decreasing due to link status chage
Fixes: 044846f071cc ("net/i40e: stop LLDP before setting local LLDP MIB")
Cc: sta...@dpdk.org
Cc: qi.z.zh...@intel.com
Signed-off-by: Chenmin Sun <chenmin....@intel.com>
---
doc/guides/nics/i40e.rst | 7 +++++++
drivers/net/i40e/i40e_ethdev.c | 38 +++++++++++++++++++++++++++-------
2 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index 6aceb53ea..d9ec07e12 100644
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -698,3 +698,10 @@ See :numref:`figure_intel_perf_test_setup` for the
performance test setup.
* Start creating a stream on packet generator.
* Set the Ethernet II type to 0x0800.
+
+Tx bytes affected by the link status change
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For firmware versions prior to 6.01 for X710 series and 3.33 for X722 series,
the tx_bytes statsistics data is affected by
+the link down event. Each time the link status changes to down, the tx_bytes
decreases 110 bytes.
+
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index a6b97e164..181efbac0 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -1493,9 +1493,6 @@ eth_i40e_dev_init(struct rte_eth_dev *dev, void
*init_params __rte_unused)
goto err_setup_pf_switch;
}
- /* reset all stats of the device, including pf and main vsi */
- i40e_dev_stats_reset(dev);
-
vsi = pf->main_vsi;
/* Disable double vlan by default */
@@ -1590,6 +1587,9 @@ eth_i40e_dev_init(struct rte_eth_dev *dev, void
*init_params __rte_unused)
memset(&pf->rss_info, 0,
sizeof(struct i40e_rte_flow_rss_conf));
+ /* reset all stats of the device, including pf and main vsi */
+ i40e_dev_stats_reset(dev);
+
return 0;
err_init_fdir_filter_list:
@@ -3454,12 +3454,38 @@ i40e_fw_version_get(struct rte_eth_dev *dev, char
*fw_version, size_t fw_size)
ver, build, patch);
ret += 1; /* add the size of '\0' */
+
if (fw_size < (u32)ret)
return ret;
else
return 0;
}
+/*
+ * When using NVM 6.01(for X710 XL710 XXV710)/3.33(for X722) or later,
+ * the Rx data path does not hang if the FW LLDP is stopped.
+ * return true if lldp need to stop
+ * return false if we cannot disable the LLDP to avoid Rx data path blocking.
+ */
+static bool
+i40e_need_stop_lldp(struct rte_eth_dev *dev)
+{
+ double nvm_ver;
+ char ver_str[64] = {0};
+ struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+
+ i40e_fw_version_get(dev, ver_str, 64);
+ nvm_ver = atof(ver_str);
+ if ((hw->mac.type == I40E_MAC_X722 ||
+ hw->mac.type == I40E_MAC_X722_VF) &&
+ ((uint32_t)(nvm_ver * 1000) >= (uint32_t)(3.33 * 1000)))
+ return true;
+ else if ((uint32_t)(nvm_ver * 1000) >= (uint32_t)(6.01 * 1000))
+ return true;
+
+ return false;
+}
+
static void
i40e_dev_info_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
{
@@ -11425,11 +11451,7 @@ i40e_dcb_init_configure(struct rte_eth_dev *dev, bool
sw_dcb)
* LLDP MIB change event.
*/
if (sw_dcb == TRUE) {
- /* When using NVM 6.01 or later, the RX data path does
- * not hang if the FW LLDP is stopped.
- */
- if (((hw->nvm.version >> 12) & 0xf) >= 6 &&
- ((hw->nvm.version >> 4) & 0xff) >= 1) {
+ if (i40e_need_stop_lldp(dev)) {
ret = i40e_aq_stop_lldp(hw, TRUE, NULL);
if (ret != I40E_SUCCESS)
PMD_INIT_LOG(DEBUG, "Failed to stop lldp");
--
2.17.1
