[PATCH net-next 18/23] bnxt_en: Add RSS support for 57500 chips.

[Michael Chan <michael.chan@broadcom.com>]

RSS context allocation and RSS indirection table setup are very different
on the new chip.  Refactor bnxt_setup_vnic() to call 2 different functions
to set up RSS for the vnic based on chip type.  On the new chip, the
number of RSS contexts and the indirection table size depends on the
number of RX rings.  Each indirection table entry is also different
on the new chip since ring groups are no longer used.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 113 ++++++++++++++++++++++++++++--
 1 file changed, 109 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 1a31328..d1f9130 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4202,7 +4202,8 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
 	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
 	struct hwrm_vnic_rss_cfg_input req = {0};
 
-	if (vnic->fw_rss_cos_lb_ctx[0] == INVALID_HW_RING_ID)
+	if ((bp->flags & BNXT_FLAG_CHIP_P5) ||
+	    vnic->fw_rss_cos_lb_ctx[0] == INVALID_HW_RING_ID)
 		return 0;
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_RSS_CFG, -1, -1);
@@ -4233,6 +4234,51 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
 	return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
 }
 
+static int bnxt_hwrm_vnic_set_rss_p5(struct bnxt *bp, u16 vnic_id, bool set_rss)
+{
+	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
+	u32 i, j, k, nr_ctxs, max_rings = bp->rx_nr_rings;
+	struct bnxt_rx_ring_info *rxr = &bp->rx_ring[0];
+	struct hwrm_vnic_rss_cfg_input req = {0};
+
+	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_RSS_CFG, -1, -1);
+	req.vnic_id = cpu_to_le16(vnic->fw_vnic_id);
+	if (!set_rss) {
+		hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+		return 0;
+	}
+	req.hash_type = cpu_to_le32(bp->rss_hash_cfg);
+	req.hash_mode_flags = VNIC_RSS_CFG_REQ_HASH_MODE_FLAGS_DEFAULT;
+	req.ring_grp_tbl_addr = cpu_to_le64(vnic->rss_table_dma_addr);
+	req.hash_key_tbl_addr = cpu_to_le64(vnic->rss_hash_key_dma_addr);
+	nr_ctxs = DIV_ROUND_UP(bp->rx_nr_rings, 64);
+	for (i = 0, k = 0; i < nr_ctxs; i++) {
+		__le16 *ring_tbl = vnic->rss_table;
+		int rc;
+
+		req.ring_table_pair_index = i;
+		req.rss_ctx_idx = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[i]);
+		for (j = 0; j < 64; j++) {
+			u16 ring_id;
+
+			ring_id = rxr->rx_ring_struct.fw_ring_id;
+			*ring_tbl++ = cpu_to_le16(ring_id);
+			ring_id = bnxt_cp_ring_for_rx(bp, rxr);
+			*ring_tbl++ = cpu_to_le16(ring_id);
+			rxr++;
+			k++;
+			if (k == max_rings) {
+				k = 0;
+				rxr = &bp->rx_ring[0];
+			}
+		}
+		rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
+		if (rc)
+			return -EIO;
+	}
+	return 0;
+}
+
 static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, u16 vnic_id)
 {
 	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
@@ -4316,6 +4362,18 @@ int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id)
 
 	bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_CFG, -1, -1);
 
+	if (bp->flags & BNXT_FLAG_CHIP_P5) {
+		struct bnxt_rx_ring_info *rxr = &bp->rx_ring[0];
+
+		req.default_rx_ring_id =
+			cpu_to_le16(rxr->rx_ring_struct.fw_ring_id);
+		req.default_cmpl_ring_id =
+			cpu_to_le16(bnxt_cp_ring_for_rx(bp, rxr));
+		req.enables =
+			cpu_to_le32(VNIC_CFG_REQ_ENABLES_DEFAULT_RX_RING_ID |
+				    VNIC_CFG_REQ_ENABLES_DEFAULT_CMPL_RING_ID);
+		goto vnic_mru;
+	}
 	req.enables = cpu_to_le32(VNIC_CFG_REQ_ENABLES_DFLT_RING_GRP);
 	/* Only RSS support for now TBD: COS & LB */
 	if (vnic->fw_rss_cos_lb_ctx[0] != INVALID_HW_RING_ID) {
@@ -4348,13 +4406,13 @@ int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id)
 		ring = bp->rx_nr_rings - 1;
 
 	grp_idx = bp->rx_ring[ring].bnapi->index;
-	req.vnic_id = cpu_to_le16(vnic->fw_vnic_id);
 	req.dflt_ring_grp = cpu_to_le16(bp->grp_info[grp_idx].fw_grp_id);
-
 	req.lb_rule = cpu_to_le16(0xffff);
+vnic_mru:
 	req.mru = cpu_to_le16(bp->dev->mtu + ETH_HLEN + ETH_FCS_LEN +
 			      VLAN_HLEN);
 
+	req.vnic_id = cpu_to_le16(vnic->fw_vnic_id);
 #ifdef CONFIG_BNXT_SRIOV
 	if (BNXT_VF(bp))
 		def_vlan = bp->vf.vlan;
@@ -6363,7 +6421,7 @@ static int bnxt_hwrm_set_cache_line_size(struct bnxt *bp, int size)
 	return rc;
 }
 
-static int bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id)
+static int __bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id)
 {
 	struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id];
 	int rc;
@@ -6419,6 +6477,53 @@ static int bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id)
 	return rc;
 }
 
+static int __bnxt_setup_vnic_p5(struct bnxt *bp, u16 vnic_id)
+{
+	int rc, i, nr_ctxs;
+
+	nr_ctxs = DIV_ROUND_UP(bp->rx_nr_rings, 64);
+	for (i = 0; i < nr_ctxs; i++) {
+		rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic_id, i);
+		if (rc) {
+			netdev_err(bp->dev, "hwrm vnic %d ctx %d alloc failure rc: %x\n",
+				   vnic_id, i, rc);
+			break;
+		}
+		bp->rsscos_nr_ctxs++;
+	}
+	if (i < nr_ctxs)
+		return -ENOMEM;
+
+	rc = bnxt_hwrm_vnic_set_rss_p5(bp, vnic_id, true);
+	if (rc) {
+		netdev_err(bp->dev, "hwrm vnic %d set rss failure rc: %d\n",
+			   vnic_id, rc);
+		return rc;
+	}
+	rc = bnxt_hwrm_vnic_cfg(bp, vnic_id);
+	if (rc) {
+		netdev_err(bp->dev, "hwrm vnic %d cfg failure rc: %x\n",
+			   vnic_id, rc);
+		return rc;
+	}
+	if (bp->flags & BNXT_FLAG_AGG_RINGS) {
+		rc = bnxt_hwrm_vnic_set_hds(bp, vnic_id);
+		if (rc) {
+			netdev_err(bp->dev, "hwrm vnic %d set hds failure rc: %x\n",
+				   vnic_id, rc);
+		}
+	}
+	return rc;
+}
+
+static int bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id)
+{
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		return __bnxt_setup_vnic_p5(bp, vnic_id);
+	else
+		return __bnxt_setup_vnic(bp, vnic_id);
+}
+
 static int bnxt_alloc_rfs_vnics(struct bnxt *bp)
 {
 #ifdef CONFIG_RFS_ACCEL
-- 
2.5.1