net/ixgbe: fix Rx queue blocking issue

In the IOV scenario, multi Rx queues can be assigned to one VF.
If the dropping is not enabled, when no descriptors are available
for one queue, this queue can block others.

Fixes: 00e30184daa0 ("ixgbe: add PF support")
Cc: stable@dpdk.org
Suggested-by: Liang-Min Larry Wang <liang-min.wang@intel.com>
Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_pf.c b/drivers/net/ixgbe/ixgbe_pf.c
index 4715045f513b6f567da1fb301ccbdd9dbdb4a1e1..d88832e5cc243c04857bb679c2c03750fd9c4a34 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_pf.c
+++ b/drivers/net/ixgbe/ixgbe_pf.c
@@ -397,15 +397,27 @@ ixgbe_vf_reset_msg(struct rte_eth_dev *dev, uint16_t vf)
        uint32_t reg_offset, vf_shift;
        const uint8_t VFRE_SHIFT = 5;  /* VFRE 32 bits per slot */
        const uint8_t VFRE_MASK = (uint8_t)((1U << VFRE_SHIFT) - 1);
+       uint8_t  nb_q_per_pool;
+       int i;
 
        vf_shift = vf & VFRE_MASK;
        reg_offset = (vf >> VFRE_SHIFT) > 0 ? 1 : 0;
 
-       /* enable transmit and receive for vf */
+       /* enable transmit for vf */
        reg = IXGBE_READ_REG(hw, IXGBE_VFTE(reg_offset));
        reg |= (reg | (1 << vf_shift));
        IXGBE_WRITE_REG(hw, IXGBE_VFTE(reg_offset), reg);
 
+       /* enable all queue drop for IOV */
+       nb_q_per_pool = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
+       for (i = vf * nb_q_per_pool; i < (vf + 1) * nb_q_per_pool; i++) {
+               IXGBE_WRITE_FLUSH(hw);
+               reg = IXGBE_QDE_ENABLE | IXGBE_QDE_WRITE;
+               reg |= i << IXGBE_QDE_IDX_SHIFT;
+               IXGBE_WRITE_REG(hw, IXGBE_QDE, reg);
+       }
+
+       /* enable receive for vf */
        reg = IXGBE_READ_REG(hw, IXGBE_VFRE(reg_offset));
        reg |= (reg | (1 << vf_shift));
        IXGBE_WRITE_REG(hw, IXGBE_VFRE(reg_offset), reg);