netdev - [PATCH net-next 07/10] bnxt_en: Call bnxt_approve_mac() after the PF gives up control of the VF MAC.

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Date:   Sat, 24 Apr 2021 16:14:28 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, kuba@...nel.org, gospo@...adcom.com
Subject: [PATCH net-next 07/10] bnxt_en: Call bnxt_approve_mac() after the PF gives up control of the VF MAC.

When the PF is no longer enforcing an assigned MAC address on a VF, the
VF needs to call bnxt_approve_mac() to tell the PF what MAC address it is
now using.  Otherwise it gets out of sync and the PF won't know what
MAC address the VF wants to use.  Ultimately the VF will fail when it
tries to setup the L2 MAC filter for the vnic.

Reviewed-by: Edwin Peer <edwin.peer@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
index e65093f4aa7a..eb00a219aa51 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c
@@ -1147,6 +1147,7 @@ void bnxt_update_vf_mac(struct bnxt *bp)
 {
 	struct hwrm_func_qcaps_input req = {0};
 	struct hwrm_func_qcaps_output *resp = bp->hwrm_cmd_resp_addr;
+	bool inform_pf = false;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_QCAPS, -1, -1);
 	req.fid = cpu_to_le16(0xffff);
@@ -1162,14 +1163,22 @@ void bnxt_update_vf_mac(struct bnxt *bp)
 	 *    default but the stored zero MAC will allow the VF user to change
 	 *    the random MAC address using ndo_set_mac_address() if he wants.
 	 */
-	if (!ether_addr_equal(resp->mac_address, bp->vf.mac_addr))
+	if (!ether_addr_equal(resp->mac_address, bp->vf.mac_addr)) {
 		memcpy(bp->vf.mac_addr, resp->mac_address, ETH_ALEN);
+		/* This means we are now using our own MAC address, let
+		 * the PF know about this MAC address.
+		 */
+		if (!is_valid_ether_addr(bp->vf.mac_addr))
+			inform_pf = true;
+	}
 
 	/* overwrite netdev dev_addr with admin VF MAC */
 	if (is_valid_ether_addr(bp->vf.mac_addr))
 		memcpy(bp->dev->dev_addr, bp->vf.mac_addr, ETH_ALEN);
 update_vf_mac_exit:
 	mutex_unlock(&bp->hwrm_cmd_lock);
+	if (inform_pf)
+		bnxt_approve_mac(bp, bp->dev->dev_addr, false);
 }
 
 #else
-- 
2.18.1


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