[dpdk-dev] [PATCH 2/2] net/bnxt: cap max Rx rings for Thor

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

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For Thor devices, RSS table can only accommodate 512 Rx queues.
When RSS is enabled, Cap the max Rx rings to 512.
For non-RSS case, the number will be limited by number of VNICs.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
---
 drivers/net/bnxt/bnxt.h        | 13 +++++++++++++
 drivers/net/bnxt/bnxt_ethdev.c |  7 ++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
index 05f8804274..263ea86590 100644
--- a/drivers/net/bnxt/bnxt.h
+++ b/drivers/net/bnxt/bnxt.h
@@ -844,6 +844,7 @@ struct bnxt {
 static
 inline uint16_t bnxt_max_rings(struct bnxt *bp)
 {
+	struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf;
 	uint16_t max_tx_rings = bp->max_tx_rings;
 	uint16_t max_rx_rings = bp->max_rx_rings;
 	uint16_t max_cp_rings = bp->max_cp_rings;
@@ -861,6 +862,18 @@ inline uint16_t bnxt_max_rings(struct bnxt *bp)
 				       bp->max_stat_ctx / 2U);
 	}
 
+	if (BNXT_CHIP_P5(bp)) {
+		/* RSS table size in Thor is 512.
+		 * Cap max Rx rings to the same value for RSS.
+		 * For non-RSS case cap it to the max VNIC count.
+		 */
+		if(dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG)
+			max_rx_rings = RTE_MIN(max_rx_rings,
+					       BNXT_RSS_TBL_SIZE_P5);
+		else
+			max_rx_rings = RTE_MIN(max_rx_rings, bp->max_vnics);
+	}
+
 	max_tx_rings = RTE_MIN(max_tx_rings, max_rx_rings);
 	if (max_cp_rings > BNXT_NUM_ASYNC_CPR(bp))
 		max_cp_rings -= BNXT_NUM_ASYNC_CPR(bp);
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index dc3b04110f..9da817f487 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c
@@ -422,12 +422,13 @@ 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);
 
+		/* RSS table size in Thor is 512.
+		 * Cap max Rx rings to same value
+		 */
 		if (bp->rx_nr_rings > BNXT_RSS_TBL_SIZE_P5) {
 			PMD_DRV_LOG(ERR, "RxQ cnt %d > reta_size %d\n",
 				    bp->rx_nr_rings, BNXT_RSS_TBL_SIZE_P5);
-			PMD_DRV_LOG(ERR,
-				    "Only queues 0-%d will be in RSS table\n",
-				    BNXT_RSS_TBL_SIZE_P5 - 1);
+			goto err_out;
 		}
 
 		rc = 0;
-- 
2.21.1 (Apple Git-122.3)