In SR-IOV mode a VF sending LFC or PFC would throttle the entire port.
The workaround is to add a filter to drop pause frames from VFs from
sending pause frames.
Signed-off-by: Jingjing Wu <jingjing.wu at intel.com>
---
drivers/net/i40e/i40e_ethdev.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 2dd9fdc..6cc2172 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -382,6 +382,30 @@ static inline void i40e_flex_payload_reg_init(struct
i40e_hw *hw)
I40E_WRITE_REG(hw, I40E_GLQF_PIT(17), 0x00007440);
}
+#define I40E_FLOW_CONTROL_ETHERTYPE 0x8808
+
+/*
+ * Add a ethertype filter to drop all flow control frames transimited
+ * from VSIs.
+*/
+static void
+i40e_add_tx_flow_control_drop_filter(struct i40e_pf *pf)
+{
+ struct i40e_hw *hw = I40E_PF_TO_HW(pf);
+ uint16_t flags = I40E_AQC_ADD_CONTROL_PACKET_FLAGS_IGNORE_MAC |
+ I40E_AQC_ADD_CONTROL_PACKET_FLAGS_DROP |
+ I40E_AQC_ADD_CONTROL_PACKET_FLAGS_TX;
+ int ret;
+
+ ret = i40e_aq_add_rem_control_packet_filter(hw, NULL,
+ I40E_FLOW_CONTROL_ETHERTYPE, flags,
+ pf->main_vsi_seid, 0,
+ TRUE, NULL, NULL);
+ if (ret)
+ PMD_INIT_LOG(ERR, "Failed to add filter to drop flow control "
+ " frames from VSIs.");
+}
+
static int
eth_i40e_dev_init(struct rte_eth_dev *dev)
{
@@ -584,6 +608,12 @@ eth_i40e_dev_init(struct rte_eth_dev *dev)
/* enable uio intr after callback register */
rte_intr_enable(&(pci_dev->intr_handle));
+ /*
+ * Add a ethertype filter to drop all flow control frames transimited
+ * from VSIs. This is used to workaround the issue -- in SR-IOV mode
+ * where a VF sending LFC or PFC would throttle the entire port.
+ */
+ i40e_add_tx_flow_control_drop_filter(pf);
/* initialize mirror rule list */
TAILQ_INIT(&pf->mirror_list);
--
2.4.0
