From: Michael Chan <michael.chan@broadcom.com>
Date: Wed, 8 Jul 2020 07:53:56 -0400
Subject: bnxt_en: Add helper function to return the number of RSS contexts.
Patch-mainline: v5.9-rc1
Git-commit: f9f6a3fbb5eb89e738ebdf16ac56437177537b28
References: jsc#SLE-15075

On some chips, this varies based on the number of RX rings.  Add this
helper function and refactor the existing code to use it.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |   13 +++++++++++--
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |    1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -4881,6 +4881,15 @@ static void bnxt_set_dflt_rss_indir_tbl(
 		memset(&bp->rss_indir_tbl[i], 0, pad * sizeof(u16));
 }
 
+int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings)
+{
+	if (bp->flags & BNXT_FLAG_CHIP_P5)
+		return DIV_ROUND_UP(rx_rings, BNXT_RSS_TABLE_ENTRIES_P5);
+	if (BNXT_CHIP_TYPE_NITRO_A0(bp))
+		return 2;
+	return 1;
+}
+
 static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss)
 {
 	u32 i, j, max_rings;
@@ -4936,7 +4945,7 @@ static int bnxt_hwrm_vnic_set_rss_p5(str
 	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);
+	nr_ctxs = bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings);
 	for (i = 0, k = 0; i < nr_ctxs; i++) {
 		__le16 *ring_tbl = vnic->rss_table;
 		int rc;
@@ -7689,7 +7698,7 @@ static int __bnxt_setup_vnic_p5(struct b
 {
 	int rc, i, nr_ctxs;
 
-	nr_ctxs = DIV_ROUND_UP(bp->rx_nr_rings, 64);
+	nr_ctxs = bnxt_get_nr_rss_ctxs(bp, bp->rx_nr_rings);
 	for (i = 0; i < nr_ctxs; i++) {
 		rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic_id, i);
 		if (rc) {
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -2037,6 +2037,7 @@ int hwrm_send_message(struct bnxt *, voi
 int hwrm_send_message_silent(struct bnxt *, void *, u32, int);
 int bnxt_hwrm_func_drv_rgtr(struct bnxt *bp, unsigned long *bmap,
 			    int bmap_size, bool async_only);
+int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id);
 int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);
 int bnxt_nq_rings_in_use(struct bnxt *bp);