[PATCH] ixgbe 82599: Query assignment of queues to Virtual Function.

[Qinglai Xiao <jigsaw-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Physical Function assignes Tx/Rx queues to each VF 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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
index f217564..991e1b3 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_ethdev.c
@@ -750,6 +750,34 @@ eth_ixgbe_dev_init(__attribute__((unused)) struct eth_driver *eth_drv,
 	return 0;
 }
 
+static void ixgbevf_negotiate_api(struct ixgbe_hw *hw)
+{
+	int api[] = { ixgbe_mbox_api_11,
+		      ixgbe_mbox_api_10,
+		      ixgbe_mbox_api_unknown };
+	int err = 0, idx = 0;
+
+	while (api[idx] != ixgbe_mbox_api_unknown) {
+		err = ixgbevf_negotiate_api_version(hw, api[idx]);
+		if (!err)
+			break;
+		idx++;
+	}
+}
+
+static void ixgbevf_get_queue_num(struct ixgbe_hw *hw)
+{
+	/* Traffic classes are not supported by now */
+	unsigned int tcs, tc;
+
+	/*
+	 * In case that PF fails to provide Rx/Tx queue number,
+	 * max_tx_queues and max_rx_queues remain to be 1.
+	 */
+	ixgbevf_get_queues(hw, &tcs, &tc);
+}
+
+
 /*
  * Virtual Function device init
  */
@@ -818,6 +846,10 @@ 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_negotiate_api(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);
-- 
1.7.1