bnxt_en: Workaround Nitro A0 RX hardware bug (part 4).

Allocate special vnic for dropping packets not matching the RX filters.
First vnic is for normal RX packets and the driver will drop all
packets on the 2nd vnic.
Signed-off-by: Prashant Sreedharan <prashant.sreedharan@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

@@ -2410,6 +2410,9 @@ static int bnxt_alloc_vnics(struct bnxt *bp)
 		num_vnics += bp->rx_nr_rings;
 #endif
 
+	if (BNXT_CHIP_TYPE_NITRO_A0(bp))
+		num_vnics++;
+
 	bp->vnic_info = kcalloc(num_vnics, sizeof(struct bnxt_vnic_info),
 				GFP_KERNEL);
 	if (!bp->vnic_info)
@@ -3271,8 +3274,10 @@ static int bnxt_hwrm_set_vnic_filter(struct bnxt *bp, u16 vnic_id, u16 idx,
 	struct hwrm_cfa_l2_filter_alloc_output *resp = bp->hwrm_cmd_resp_addr;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_L2_FILTER_ALLOC, -1, -1);
-	req.flags = cpu_to_le32(CFA_L2_FILTER_ALLOC_REQ_FLAGS_PATH_RX |
-				CFA_L2_FILTER_ALLOC_REQ_FLAGS_OUTERMOST);
+	req.flags = cpu_to_le32(CFA_L2_FILTER_ALLOC_REQ_FLAGS_PATH_RX);
+	if (!BNXT_CHIP_TYPE_NITRO_A0(bp))
+		req.flags |=
+			cpu_to_le32(CFA_L2_FILTER_ALLOC_REQ_FLAGS_OUTERMOST);
 	req.dst_id = cpu_to_le16(bp->vnic_info[vnic_id].fw_vnic_id);
 	req.enables =
 		cpu_to_le32(CFA_L2_FILTER_ALLOC_REQ_ENABLES_L2_ADDR |
@@ -3391,10 +3396,14 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
 
 		req.hash_type = cpu_to_le32(vnic->hash_type);
 
-		if (vnic->flags & BNXT_VNIC_RSS_FLAG)
-			max_rings = bp->rx_nr_rings;
+		if (vnic->flags & BNXT_VNIC_RSS_FLAG) {
+			if (BNXT_CHIP_TYPE_NITRO_A0(bp))
+				max_rings = bp->rx_nr_rings - 1;
 			else
+				max_rings = bp->rx_nr_rings;
+		} else {
 			max_rings = 1;
+		}
 
 		/* Fill the RSS indirection table with ring group ids */
 		for (i = 0, j = 0; i < HW_HASH_INDEX_SIZE; i++, j++) {
@@ -3486,13 +3495,19 @@ static int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id)
 	u16 def_vlan = 0;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_CFG, -1, -1);
+
+	req.enables = cpu_to_le32(VNIC_CFG_REQ_ENABLES_DFLT_RING_GRP);
 	/* Only RSS support for now TBD: COS & LB */
-	req.enables = cpu_to_le32(VNIC_CFG_REQ_ENABLES_DFLT_RING_GRP |
-				  VNIC_CFG_REQ_ENABLES_RSS_RULE |
-				  VNIC_CFG_REQ_ENABLES_MRU);
+	if (vnic->fw_rss_cos_lb_ctx[0] != INVALID_HW_RING_ID) {
 		req.rss_rule = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[0]);
+		req.enables |= cpu_to_le32(VNIC_CFG_REQ_ENABLES_RSS_RULE |
+					   VNIC_CFG_REQ_ENABLES_MRU);
+	} else {
+		req.rss_rule = cpu_to_le16(0xffff);
+	}
 
-	if (BNXT_CHIP_TYPE_NITRO_A0(bp)) {
+	if (BNXT_CHIP_TYPE_NITRO_A0(bp) &&
+	    (vnic->fw_rss_cos_lb_ctx[0] != INVALID_HW_RING_ID)) {
 		req.cos_rule = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[1]);
 		req.enables |= cpu_to_le32(VNIC_CFG_REQ_ENABLES_COS_RULE);
 	} else {
@@ -4430,6 +4445,26 @@ static bool bnxt_promisc_ok(struct bnxt *bp)
 	return true;
 }
 
+static int bnxt_setup_nitroa0_vnic(struct bnxt *bp)
+{
+	unsigned int rc = 0;
+
+	rc = bnxt_hwrm_vnic_alloc(bp, 1, bp->rx_nr_rings - 1, 1);
+	if (rc) {
+		netdev_err(bp->dev, "Cannot allocate special vnic for NS2 A0: %x\n",
+			   rc);
+		return rc;
+	}
+
+	rc = bnxt_hwrm_vnic_cfg(bp, 1);
+	if (rc) {
+		netdev_err(bp->dev, "Cannot allocate special vnic for NS2 A0: %x\n",
+			   rc);
+		return rc;
+	}
+	return rc;
+}
+
 static int bnxt_cfg_rx_mode(struct bnxt *);
 static bool bnxt_mc_list_updated(struct bnxt *, u32 *);
 
@@ -4521,6 +4556,13 @@ static int bnxt_init_chip(struct bnxt *bp, bool irq_re_init)
 		netdev_warn(bp->dev, "HWRM set coalescing failure rc: %x\n",
 				rc);
 
+	if (BNXT_CHIP_TYPE_NITRO_A0(bp)) {
+		rc = bnxt_setup_nitroa0_vnic(bp);
+		if (rc)
+			netdev_err(bp->dev, "Special vnic setup failure for NS2 A0 rc: %x\n",
+				   rc);
+	}
+
 	if (BNXT_VF(bp)) {
 		bnxt_hwrm_func_qcfg(bp);
 		netdev_update_features(bp->dev);