From: Qi Zhang <qi.z.zhang@intel.com>
Date: Wed, 8 Mar 2017 06:19:03 +0000 (-0500)
Subject: net/fm10k/base: improve re-map queues handle
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=a94bceb1e30bc0cde391d9d2d3297995a3800412;p=dpdk.git

net/fm10k/base: improve re-map queues handle

Avoid potential FUM fault errors on a VF when updating MAC address
and VLAN information. Only use the register flow when the mailbox is
disconnected, by checking if the enqueue_tx returns
FM10K_MBX_ERR_NO_MBX. If the mailbox message can be sent, there is no
reason to bother with the register writes which are only intended to
be used during VF driver initialization.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---

diff --git a/drivers/net/fm10k/base/fm10k_common.c b/drivers/net/fm10k/base/fm10k_common.c
index 7acc1baefd..29f35d7d91 100644
--- a/drivers/net/fm10k/base/fm10k_common.c
+++ b/drivers/net/fm10k/base/fm10k_common.c
@@ -230,6 +230,9 @@ s32 fm10k_disable_queues_generic(struct fm10k_hw *hw, u16 q_cnt)
 	/* clear tx_ready to prevent any false hits for reset */
 	hw->mac.tx_ready = false;
 
+	if (FM10K_REMOVED(hw->hw_addr))
+		return FM10K_SUCCESS;
+
 	/* clear the enable bit for all rings */
 	for (i = 0; i < q_cnt; i++) {
 		reg = FM10K_READ_REG(hw, FM10K_TXDCTL(i));
diff --git a/drivers/net/fm10k/base/fm10k_pf.c b/drivers/net/fm10k/base/fm10k_pf.c
index bce29134a9..5b1098e975 100644
--- a/drivers/net/fm10k/base/fm10k_pf.c
+++ b/drivers/net/fm10k/base/fm10k_pf.c
@@ -926,9 +926,35 @@ STATIC s32 fm10k_iov_assign_default_mac_vlan_pf(struct fm10k_hw *hw,
 	fm10k_tlv_attr_put_mac_vlan(msg, FM10K_MAC_VLAN_MSG_DEFAULT_MAC,
 				    vf_info->mac, vf_vid);
 
-	/* load onto outgoing mailbox, ignore any errors on enqueue */
-	if (vf_info->mbx.ops.enqueue_tx)
-		vf_info->mbx.ops.enqueue_tx(hw, &vf_info->mbx, msg);
+	/* Configure Queue control register with new VLAN ID. The TXQCTL
+	 * register is RO from the VF, so the PF must do this even in the
+	 * case of notifying the VF of a new VID via the mailbox.
+	 */
+	txqctl = ((u32)vf_vid << FM10K_TXQCTL_VID_SHIFT) &
+		 FM10K_TXQCTL_VID_MASK;
+	txqctl |= (vf_idx << FM10K_TXQCTL_TC_SHIFT) |
+		  FM10K_TXQCTL_VF | vf_idx;
+
+	for (i = 0; i < queues_per_pool; i++)
+		FM10K_WRITE_REG(hw, FM10K_TXQCTL(vf_q_idx + i), txqctl);
+
+	/* try loading a message onto outgoing mailbox first */
+	if (vf_info->mbx.ops.enqueue_tx) {
+		err = vf_info->mbx.ops.enqueue_tx(hw, &vf_info->mbx, msg);
+		if (err != FM10K_MBX_ERR_NO_MBX)
+			return err;
+		err = FM10K_SUCCESS;
+	}
+
+	/* If we aren't connected to a mailbox, this is most likely because
+	 * the VF driver is not running. It should thus be safe to re-map
+	 * queues and use the registers to pass the MAC address so that the VF
+	 * driver gets correct information during its initialization.
+	 */
+
+	/* MAP Tx queue back to 0 temporarily, and disable it */
+	FM10K_WRITE_REG(hw, FM10K_TQMAP(qmap_idx), 0);
+	FM10K_WRITE_REG(hw, FM10K_TXDCTL(vf_q_idx), 0);
 
 	/* verify ring has disabled before modifying base address registers */
 	txdctl = FM10K_READ_REG(hw, FM10K_TXDCTL(vf_q_idx));
@@ -967,16 +993,6 @@ STATIC s32 fm10k_iov_assign_default_mac_vlan_pf(struct fm10k_hw *hw,
 						   FM10K_TDLEN_ITR_SCALE_SHIFT);
 
 err_out:
-	/* configure Queue control register */
-	txqctl = ((u32)vf_vid << FM10K_TXQCTL_VID_SHIFT) &
-		 FM10K_TXQCTL_VID_MASK;
-	txqctl |= (vf_idx << FM10K_TXQCTL_TC_SHIFT) |
-		  FM10K_TXQCTL_VF | vf_idx;
-
-	/* assign VLAN ID */
-	for (i = 0; i < queues_per_pool; i++)
-		FM10K_WRITE_REG(hw, FM10K_TXQCTL(vf_q_idx + i), txqctl);
-
 	/* restore the queue back to VF ownership */
 	FM10K_WRITE_REG(hw, FM10K_TQMAP(qmap_idx), vf_q_idx);
 	return err;