bnxt_en: Refactor RSS indir alloc/set functions

We will need to dynamically allocate and change indirection tables
for additional RSS contexts.  Add the rss_ctx pointer parameter to
bnxt_alloc_rss_indir_tbl() and bnxt_set_dflt_rss_indir_tbl().
Existing usage will always pass rss_ctx as NULL which means the
default RSS context.

When supporting additional RSS contexts in subsequent patches, we'll
pass the valid rss_ctx to these 2 functions.
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20240325222902.220712-7-michael.chan@broadcom.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -6026,9 +6026,10 @@ static u16 bnxt_cp_ring_for_tx(struct bnxt *bp, struct bnxt_tx_ring_info *txr)
 		return bnxt_cp_ring_from_grp(bp, &txr->tx_ring_struct);
 }
 
-static int bnxt_alloc_rss_indir_tbl(struct bnxt *bp)
+int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 {
 	int entries;
+	u16 *tbl;
 
 	if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS)
 		entries = BNXT_MAX_RSS_TABLE_ENTRIES_P5;
@@ -6036,16 +6037,22 @@ static int bnxt_alloc_rss_indir_tbl(struct bnxt *bp)
 		entries = HW_HASH_INDEX_SIZE;
 
 	bp->rss_indir_tbl_entries = entries;
-	bp->rss_indir_tbl = kmalloc_array(entries, sizeof(*bp->rss_indir_tbl),
-					  GFP_KERNEL);
-	if (!bp->rss_indir_tbl)
+	tbl = kmalloc_array(entries, sizeof(*bp->rss_indir_tbl), GFP_KERNEL);
+	if (!tbl)
 		return -ENOMEM;
+
+	if (rss_ctx)
+		rss_ctx->rss_indir_tbl = tbl;
+	else
+		bp->rss_indir_tbl = tbl;
+
 	return 0;
 }
 
-static void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp)
+void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx)
 {
 	u16 max_rings, max_entries, pad, i;
+	u16 *rss_indir_tbl;
 
 	if (!bp->rx_nr_rings)
 		return;
@@ -6056,13 +6063,17 @@ static void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp)
 		max_rings = bp->rx_nr_rings;
 
 	max_entries = bnxt_get_rxfh_indir_size(bp->dev);
+	if (rss_ctx)
+		rss_indir_tbl = &rss_ctx->rss_indir_tbl[0];
+	else
+		rss_indir_tbl = &bp->rss_indir_tbl[0];
 
 	for (i = 0; i < max_entries; i++)
-		bp->rss_indir_tbl[i] = ethtool_rxfh_indir_default(i, max_rings);
+		rss_indir_tbl[i] = ethtool_rxfh_indir_default(i, max_rings);
 
 	pad = bp->rss_indir_tbl_entries - max_entries;
 	if (pad)
-		memset(&bp->rss_indir_tbl[i], 0, pad * sizeof(u16));
+		memset(&rss_indir_tbl[i], 0, pad * sizeof(u16));
 }
 
 static u16 bnxt_get_max_rss_ring(struct bnxt *bp)
@@ -7341,7 +7352,7 @@ static void bnxt_check_rss_tbl_no_rmgr(struct bnxt *bp)
 	if (hw_resc->resv_rx_rings != bp->rx_nr_rings) {
 		hw_resc->resv_rx_rings = bp->rx_nr_rings;
 		if (!netif_is_rxfh_configured(bp->dev))
-			bnxt_set_dflt_rss_indir_tbl(bp);
+			bnxt_set_dflt_rss_indir_tbl(bp, NULL);
 	}
 }
 
@@ -7497,7 +7508,7 @@ static int __bnxt_reserve_rings(struct bnxt *bp)
 		return -ENOMEM;
 
 	if (!netif_is_rxfh_configured(bp->dev))
-		bnxt_set_dflt_rss_indir_tbl(bp);
+		bnxt_set_dflt_rss_indir_tbl(bp, NULL);
 
 	return rc;
 }
@@ -15119,7 +15130,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 			bp->flags |= BNXT_FLAG_CHIP_P7;
 	}
 
-	rc = bnxt_alloc_rss_indir_tbl(bp);
+	rc = bnxt_alloc_rss_indir_tbl(bp, NULL);
 	if (rc)
 		goto init_err_pci_clean;
 

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

@@ -2715,6 +2715,8 @@ int bnxt_hwrm_cfa_ntuple_filter_free(struct bnxt *bp,
 int bnxt_hwrm_cfa_ntuple_filter_alloc(struct bnxt *bp,
 				      struct bnxt_ntuple_filter *fltr);
 void bnxt_fill_ipv6_mask(__be32 mask[4]);
+int bnxt_alloc_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
+void bnxt_set_dflt_rss_indir_tbl(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx);
 int bnxt_get_nr_rss_ctxs(struct bnxt *bp, int rx_rings);
 int bnxt_hwrm_vnic_cfg(struct bnxt *bp, struct bnxt_vnic_info *vnic);
 int __bnxt_hwrm_get_tx_rings(struct bnxt *bp, u16 fid, int *tx_rings);