bnxt_en: Call firmware to approve VF MAC address change.

Some hypervisors (e.g. ESX) require the VF MAC address to be forwarded to
the PF for approval.  In Linux PF, the call is not forwarded and the
firmware will simply check and approve the MAC address if the PF has not
previously administered a valid MAC address for this VF.
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -5696,10 +5696,9 @@ static int bnxt_change_mac_addr(struct net_device *dev, void *p)
 	if (!is_valid_ether_addr(addr->sa_data))
 		return -EADDRNOTAVAIL;
 
-#ifdef CONFIG_BNXT_SRIOV
-	if (BNXT_VF(bp) && is_valid_ether_addr(bp->vf.mac_addr))
-		return -EADDRNOTAVAIL;
-#endif
+	rc = bnxt_approve_mac(bp, addr->sa_data);
+	if (rc)
+		return rc;
 
 	if (ether_addr_equal(addr->sa_data, dev->dev_addr))
 		return 0;

drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.c

@@ -865,6 +865,31 @@ void bnxt_update_vf_mac(struct bnxt *bp)
 	mutex_unlock(&bp->hwrm_cmd_lock);
 }
 
+int bnxt_approve_mac(struct bnxt *bp, u8 *mac)
+{
+	struct hwrm_func_vf_cfg_input req = {0};
+	int rc = 0;
+
+	if (!BNXT_VF(bp))
+		return 0;
+
+	if (bp->hwrm_spec_code < 0x10202) {
+		if (is_valid_ether_addr(bp->vf.mac_addr))
+			rc = -EADDRNOTAVAIL;
+		goto mac_done;
+	}
+	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_VF_CFG, -1, -1);
+	req.enables = cpu_to_le32(FUNC_VF_CFG_REQ_ENABLES_DFLT_MAC_ADDR);
+	memcpy(req.dflt_mac_addr, mac, ETH_ALEN);
+	rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+mac_done:
+	if (rc) {
+		rc = -EADDRNOTAVAIL;
+		netdev_warn(bp->dev, "VF MAC address %pM not approved by the PF\n",
+			    mac);
+	}
+	return rc;
+}
 #else
 
 void bnxt_sriov_disable(struct bnxt *bp)
@@ -879,4 +904,9 @@ void bnxt_hwrm_exec_fwd_req(struct bnxt *bp)
 void bnxt_update_vf_mac(struct bnxt *bp)
 {
 }
+
+int bnxt_approve_mac(struct bnxt *bp, u8 *mac)
+{
+	return 0;
+}
 #endif

drivers/net/ethernet/broadcom/bnxt/bnxt_sriov.h

@@ -20,4 +20,5 @@ int bnxt_sriov_configure(struct pci_dev *pdev, int num_vfs);
 void bnxt_sriov_disable(struct bnxt *);
 void bnxt_hwrm_exec_fwd_req(struct bnxt *);
 void bnxt_update_vf_mac(struct bnxt *);
+int bnxt_approve_mac(struct bnxt *, u8 *);
 #endif