net/bnxt: fix Rx rings in RSS redirection table

[ upstream commit d424af4 ]

This commit introduces a limit on the number of RX rings included in
the RSS redirection table to a value no larger than the size supported
by Thor as defined by BNXT_RSS_TBL_SIZE_THOR.

Fixes: d819382 ("net/bnxt: add RSS redirection table operations")

Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Samik Gupta <samik.gupta@broadcom.com>

drivers/net/bnxt/bnxt.h

@@ -389,7 +389,7 @@ struct bnxt_coal {
 #define DBR_TYPE_NQ				(0xaULL << 60)
 #define DBR_TYPE_NQ_ARM				(0xbULL << 60)
 
-#define BNXT_RSS_TBL_SIZE_THOR		512
+#define BNXT_RSS_TBL_SIZE_THOR		512U
 #define BNXT_RSS_ENTRIES_PER_CTX_THOR	64
 #define BNXT_MAX_RSS_CTXTS_THOR \
 	(BNXT_RSS_TBL_SIZE_THOR / BNXT_RSS_ENTRIES_PER_CTX_THOR)

drivers/net/bnxt/bnxt_ethdev.c

@@ -207,12 +207,15 @@ int is_bnxt_in_error(struct bnxt *bp)
 
 static uint16_t bnxt_rss_ctxts(const struct bnxt *bp)
 {
+	unsigned int num_rss_rings = RTE_MIN(bp->rx_nr_rings,
+					     BNXT_RSS_TBL_SIZE_THOR);
+
 	if (!BNXT_CHIP_THOR(bp))
 		return 1;
 
-	return RTE_ALIGN_MUL_CEIL(bp->rx_nr_rings,
+	return RTE_ALIGN_MUL_CEIL(num_rss_rings,
 				  BNXT_RSS_ENTRIES_PER_CTX_THOR) /
-				    BNXT_RSS_ENTRIES_PER_CTX_THOR;
+				  BNXT_RSS_ENTRIES_PER_CTX_THOR;
 }
 
 uint16_t bnxt_rss_hash_tbl_size(const struct bnxt *bp)
@@ -424,6 +427,14 @@ static int bnxt_setup_one_vnic(struct bnxt *bp, uint16_t vnic_id)
 	if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS) {
 		int j, nr_ctxs = bnxt_rss_ctxts(bp);
 
+		if (bp->rx_nr_rings > BNXT_RSS_TBL_SIZE_THOR) {
+			PMD_DRV_LOG(ERR, "RxQ cnt %d > reta_size %d\n",
+				    bp->rx_nr_rings, BNXT_RSS_TBL_SIZE_THOR);
+			PMD_DRV_LOG(ERR,
+				    "Only queues 0-%d will be in RSS table\n",
+				    BNXT_RSS_TBL_SIZE_THOR - 1);
+		}
+
 		rc = 0;
 		for (j = 0; j < nr_ctxs; j++) {
 			rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic, j);