bnxt_en: Increase RSS context array count and skip ring groups on 57500 chips.

On the new 57500 chips, we need to allocate one RSS context for every
64 RX rings.  In previous chips, only one RSS context per vnic is
required regardless of the number of RX rings.  So increase the max
RSS context array count to 8.

Hardware ring groups are not used on the new chips.  Note that the
software ring group structure is still maintained in the driver to
keep track of the rings associated with the vnic.
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

@@ -2881,10 +2881,12 @@ static void bnxt_init_vnics(struct bnxt *bp)
 
 	for (i = 0; i < bp->nr_vnics; i++) {
 		struct bnxt_vnic_info *vnic = &bp->vnic_info[i];
+		int j;
 
 		vnic->fw_vnic_id = INVALID_HW_RING_ID;
-		vnic->fw_rss_cos_lb_ctx[0] = INVALID_HW_RING_ID;
-		vnic->fw_rss_cos_lb_ctx[1] = INVALID_HW_RING_ID;
+		for (j = 0; j < BNXT_MAX_CTX_PER_VNIC; j++)
+			vnic->fw_rss_cos_lb_ctx[j] = INVALID_HW_RING_ID;
+
 		vnic->fw_l2_ctx_id = INVALID_HW_RING_ID;
 
 		if (bp->vnic_info[i].rss_hash_key) {
@@ -3098,6 +3100,9 @@ static int bnxt_alloc_vnic_attributes(struct bnxt *bp)
 			}
 		}
 
+		if (bp->flags & BNXT_FLAG_CHIP_P5)
+			goto vnic_skip_grps;
+
 		if (vnic->flags & BNXT_VNIC_RSS_FLAG)
 			max_rings = bp->rx_nr_rings;
 		else
@@ -3108,7 +3113,7 @@ static int bnxt_alloc_vnic_attributes(struct bnxt *bp)
 			rc = -ENOMEM;
 			goto out;
 		}
-
+vnic_skip_grps:
 		if ((bp->flags & BNXT_FLAG_NEW_RSS_CAP) &&
 		    !(vnic->flags & BNXT_VNIC_RSS_FLAG))
 			continue;
@@ -4397,6 +4402,10 @@ static int bnxt_hwrm_vnic_alloc(struct bnxt *bp, u16 vnic_id,
 	unsigned int i, j, grp_idx, end_idx = start_rx_ring_idx + nr_rings;
 	struct hwrm_vnic_alloc_input req = {0};
 	struct hwrm_vnic_alloc_output *resp = bp->hwrm_cmd_resp_addr;
+	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
+
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		goto vnic_no_ring_grps;
 
 	/* map ring groups to this vnic */
 	for (i = start_rx_ring_idx, j = 0; i < end_idx; i++, j++) {
@@ -4406,12 +4415,12 @@ static int bnxt_hwrm_vnic_alloc(struct bnxt *bp, u16 vnic_id,
 				   j, nr_rings);
 			break;
 		}
-		bp->vnic_info[vnic_id].fw_grp_ids[j] =
-					bp->grp_info[grp_idx].fw_grp_id;
+		vnic->fw_grp_ids[j] = bp->grp_info[grp_idx].fw_grp_id;
 	}
 
-	bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[0] = INVALID_HW_RING_ID;
-	bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[1] = INVALID_HW_RING_ID;
+vnic_no_ring_grps:
+	for (i = 0; i < BNXT_MAX_CTX_PER_VNIC; i++)
+		vnic->fw_rss_cos_lb_ctx[i] = INVALID_HW_RING_ID;
 	if (vnic_id == 0)
 		req.flags = cpu_to_le32(VNIC_ALLOC_REQ_FLAGS_DEFAULT);
 
@@ -4420,7 +4429,7 @@ static int bnxt_hwrm_vnic_alloc(struct bnxt *bp, u16 vnic_id,
 	mutex_lock(&bp->hwrm_cmd_lock);
 	rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 	if (!rc)
-		bp->vnic_info[vnic_id].fw_vnic_id = le32_to_cpu(resp->vnic_id);
+		vnic->fw_vnic_id = le32_to_cpu(resp->vnic_id);
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	return rc;
 }
@@ -4456,6 +4465,9 @@ static int bnxt_hwrm_ring_grp_alloc(struct bnxt *bp)
 	u16 i;
 	u32 rc = 0;
 
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		return 0;
+
 	mutex_lock(&bp->hwrm_cmd_lock);
 	for (i = 0; i < bp->rx_nr_rings; i++) {
 		struct hwrm_ring_grp_alloc_input req = {0};
@@ -4488,7 +4500,7 @@ static int bnxt_hwrm_ring_grp_free(struct bnxt *bp)
 	u32 rc = 0;
 	struct hwrm_ring_grp_free_input req = {0};
 
-	if (!bp->grp_info)
+	if (!bp->grp_info || (bp->flags & BNXT_FLAG_CHIP_P5))
 		return 0;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_RING_GRP_FREE, -1, -1);

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

@@ -862,7 +862,7 @@ struct bnxt_ring_grp_info {
 
 struct bnxt_vnic_info {
 	u16		fw_vnic_id; /* returned by Chimp during alloc */
-#define BNXT_MAX_CTX_PER_VNIC	2
+#define BNXT_MAX_CTX_PER_VNIC	8
 	u16		fw_rss_cos_lb_ctx[BNXT_MAX_CTX_PER_VNIC];
 	u16		fw_l2_ctx_id;
 #define BNXT_MAX_UC_ADDRS	4