i40e: disable buggy VEB switching

Disable VEB switching by removing ALLOW_LB on SRIOV vsi.

If the source mac address of packet sent from VF is not listed in the
VEB's mac table, the VEB will switch the packet back to the VF.
It's a hardware issue. Enabling ALLOW_LB flag will block VF functions.

Test report: http://www.dpdk.org/ml/archives/dev/2015-March/015687.html

Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
Tested-by: Huilong Xu <huilongx.xu@intel.com>

diff --git a/lib/librte_pmd_i40e/i40e_ethdev.c b/lib/librte_pmd_i40e/i40e_ethdev.c
index 80fc432..00d044f 100644 (file)
--- a/lib/librte_pmd_i40e/i40e_ethdev.c
+++ b/lib/librte_pmd_i40e/i40e_ethdev.c
@@ -3059,11 +3059,15 @@ i40e_vsi_setup(struct i40e_pf *pf,
                ctxt.connection_type = 0x1;
                ctxt.flags = I40E_AQ_VSI_TYPE_VF;
 
-               /* Configure switch ID */
-               ctxt.info.valid_sections |=
-                       rte_cpu_to_le_16(I40E_AQ_VSI_PROP_SWITCH_VALID);
-               ctxt.info.switch_id =
-                       rte_cpu_to_le_16(I40E_AQ_VSI_SW_ID_FLAG_ALLOW_LB);
+               /**
+                * Do not configure switch ID to enable VEB switch by
+                * I40E_AQ_VSI_SW_ID_FLAG_ALLOW_LB. Because in Fortville,
+                * if the source mac address of packet sent from VF is not
+                * listed in the VEB's mac table, the VEB will switch the
+                * packet back to the VF. Need to enable it when HW issue
+                * is fixed.
+                */
+
                /* Configure port/vlan */
                ctxt.info.valid_sections |=
                        rte_cpu_to_le_16(I40E_AQ_VSI_PROP_VLAN_VALID);