ixgbe: query assignment of VF queues

Physical Function assignes Tx/Rx queues to each Virtual Function
according to different schemes[1]. By querying through mailbox,
VF is able to get number of Tx/Rx queues assigned to it.

Note that current Intel ixgbe driver ixgbe-3.18.7 does not fully
support mailbox message IXGBE_VF_GET_QUEUES. The service routine
for IXGBE_VF_GET_QUEUES must be fixed, otherwise PF always return
1 as Tx/Rx queue number.

[1] See section 7.2.1.2.1, 7.1.2.2 and 7.10.2.7.2 of Intel 82599 10
    Gbe Controller Datasheet.

Signed-off-by: Qinglai Xiao <jigsaw@gmail.com>
Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>

diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index a95bc28..2276104 100644 (file)
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -772,6 +772,21 @@ eth_ixgbe_dev_init(__attribute__((unused)) struct eth_driver *eth_drv,
        return 0;
 }
 
+static void ixgbevf_get_queue_num(struct ixgbe_hw *hw)
+{
+       /* Traffic classes are not supported by now */
+       unsigned int tcs, tc;
+
+       /*
+        * Must let PF know we are at mailbox API version 1.1.
+        * Otherwise PF won't answer properly.
+        * In case that PF fails to provide Rx/Tx queue number,
+        * max_tx_queues and max_rx_queues remain to be 1.
+        */
+       if (!ixgbevf_negotiate_api_version(hw, ixgbe_mbox_api_11))
+               ixgbevf_get_queues(hw, &tcs, &tc);
+}
+
 /*
  * Virtual Function device init
  */
@@ -840,6 +855,9 @@ eth_ixgbevf_dev_init(__attribute__((unused)) struct eth_driver *eth_drv,
                return (diag);
        }
 
+       /* Get Rx/Tx queue count via mailbox, which is ready after reset_hw */
+       ixgbevf_get_queue_num(hw);
+
        /* Allocate memory for storing MAC addresses */
        eth_dev->data->mac_addrs = rte_zmalloc("ixgbevf", ETHER_ADDR_LEN *
                        hw->mac.num_rar_entries, 0);