bnxt_en: allow firmware to disable VLAN offloads

Bare-metal use cases require giving firmware and the embedded
application processor control over VLAN offloads. The driver should
not attempt to override or utilize this feature in such scenarios
since it will not work as expected.
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
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

@@ -5218,6 +5218,14 @@ static int bnxt_hwrm_vnic_qcaps(struct bnxt *bp)
 		if (flags &
 		    VNIC_QCAPS_RESP_FLAGS_ROCE_MIRRORING_CAPABLE_VNIC_CAP)
 			bp->flags |= BNXT_FLAG_ROCE_MIRROR_CAP;
+
+		/* Older P5 fw before EXT_HW_STATS support did not set
+		 * VLAN_STRIP_CAP properly.
+		 */
+		if ((flags & VNIC_QCAPS_RESP_FLAGS_VLAN_STRIP_CAP) ||
+		    ((bp->flags & BNXT_FLAG_CHIP_P5) &&
+		     !(bp->fw_cap & BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED)))
+			bp->fw_cap |= BNXT_FW_CAP_VLAN_RX_STRIP;
 		bp->max_tpa_v2 = le16_to_cpu(resp->max_aggs_supported);
 		if (bp->max_tpa_v2)
 			bp->hw_ring_stats_size =
@@ -7049,7 +7057,7 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 	struct hwrm_func_qcaps_input req = {0};
 	struct hwrm_func_qcaps_output *resp = bp->hwrm_cmd_resp_addr;
 	struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
-	u32 flags;
+	u32 flags, flags_ext;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_QCAPS, -1, -1);
 	req.fid = cpu_to_le16(0xffff);
@@ -7074,6 +7082,12 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp)
 		bp->fw_cap |= BNXT_FW_CAP_ERROR_RECOVERY;
 	if (flags & FUNC_QCAPS_RESP_FLAGS_ERR_RECOVER_RELOAD)
 		bp->fw_cap |= BNXT_FW_CAP_ERR_RECOVER_RELOAD;
+	if (!(flags & FUNC_QCAPS_RESP_FLAGS_VLAN_ACCELERATION_TX_DISABLED))
+		bp->fw_cap |= BNXT_FW_CAP_VLAN_TX_INSERT;
+
+	flags_ext = le32_to_cpu(resp->flags_ext);
+	if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_EXT_HW_STATS_SUPPORTED)
+		bp->fw_cap |= BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED;
 
 	bp->tx_push_thresh = 0;
 	if ((flags & FUNC_QCAPS_RESP_FLAGS_PUSH_MODE_SUPPORTED) &&
@@ -12052,8 +12066,10 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	dev->gso_partial_features = NETIF_F_GSO_UDP_TUNNEL_CSUM |
 				    NETIF_F_GSO_GRE_CSUM;
 	dev->vlan_features = dev->hw_features | NETIF_F_HIGHDMA;
-	dev->hw_features |= BNXT_HW_FEATURE_VLAN_ALL_RX |
-			    BNXT_HW_FEATURE_VLAN_ALL_TX;
+	if (bp->fw_cap & BNXT_FW_CAP_VLAN_RX_STRIP)
+		dev->hw_features |= BNXT_HW_FEATURE_VLAN_ALL_RX;
+	if (bp->fw_cap & BNXT_FW_CAP_VLAN_TX_INSERT)
+		dev->hw_features |= BNXT_HW_FEATURE_VLAN_ALL_TX;
 	if (BNXT_SUPPORTS_TPA(bp))
 		dev->hw_features |= NETIF_F_GRO_HW;
 	dev->features |= dev->hw_features | NETIF_F_HIGHDMA;

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

@@ -1716,6 +1716,9 @@ struct bnxt {
 	#define BNXT_FW_CAP_ERR_RECOVER_RELOAD		0x00100000
 	#define BNXT_FW_CAP_HOT_RESET			0x00200000
 	#define BNXT_FW_CAP_SHARED_PORT_CFG		0x00400000
+	#define BNXT_FW_CAP_VLAN_RX_STRIP		0x01000000
+	#define BNXT_FW_CAP_VLAN_TX_INSERT		0x02000000
+	#define BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED	0x04000000
 
 #define BNXT_NEW_RM(bp)		((bp)->fw_cap & BNXT_FW_CAP_NEW_RM)
 	u32			hwrm_spec_code;