net/bnxt: fix ring calculation for representors

Currently the Tx and Rx ring count for representors is fixed.
It does not consider the number of rings created for the parent
function. And that can cause issues not only during initialization
but while running traffic.
Instead check the number of rings created for the parent function
while configuring the ring resources for representors.
In some cases VF rep ring init may happen before the parent function's
rings have been setup. And this can cause representor ring count to be
configured as 0. In such cases, initialize the VF representor
ring count to 8.

Fixes: 322bd6e ("net/bnxt: add port representor infrastructure")
Cc: stable@dpdk.org

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>

drivers/net/bnxt/bnxt.h

@@ -831,7 +831,7 @@ struct bnxt {
 	uint16_t		max_tx_rings;
 	uint16_t		max_rx_rings;
 #define MAX_STINGRAY_RINGS		236U
-#define BNXT_MAX_VF_REP_RINGS	8
+#define BNXT_MAX_VF_REP_RINGS	8U
 
 	uint16_t		max_nq_rings;
 	uint16_t		max_l2_ctx;

drivers/net/bnxt/bnxt_reps.c

@@ -548,7 +548,10 @@ int bnxt_rep_dev_info_get_op(struct rte_eth_dev *eth_dev,
 	dev_info->max_mac_addrs = parent_bp->max_l2_ctx;
 	dev_info->max_hash_mac_addrs = 0;
 
-	max_rx_rings = BNXT_MAX_VF_REP_RINGS;
+	max_rx_rings = parent_bp->rx_nr_rings ?
+		RTE_MIN(parent_bp->rx_nr_rings, BNXT_MAX_VF_REP_RINGS) :
+		BNXT_MAX_VF_REP_RINGS;
+
 	/* For the sake of symmetry, max_rx_queues = max_tx_queues */
 	dev_info->max_rx_queues = max_rx_rings;
 	dev_info->max_tx_queues = max_rx_rings;
@@ -629,10 +632,10 @@ int bnxt_rep_rx_queue_setup_op(struct rte_eth_dev *eth_dev,
 	struct rte_mbuf **buf_ring;
 	int rc = 0;
 
-	if (queue_idx >= BNXT_MAX_VF_REP_RINGS) {
+	if (queue_idx >= rep_bp->rx_nr_rings) {
 		PMD_DRV_LOG(ERR,
 			    "Cannot create Rx ring %d. %d rings available\n",
-			    queue_idx, BNXT_MAX_VF_REP_RINGS);
+			    queue_idx, rep_bp->rx_nr_rings);
 		return -EINVAL;
 	}
 
@@ -729,10 +732,10 @@ int bnxt_rep_tx_queue_setup_op(struct rte_eth_dev *eth_dev,
 	struct bnxt_tx_queue *parent_txq, *txq;
 	struct bnxt_vf_rep_tx_queue *vfr_txq;
 
-	if (queue_idx >= BNXT_MAX_VF_REP_RINGS) {
+	if (queue_idx >= rep_bp->rx_nr_rings) {
 		PMD_DRV_LOG(ERR,
 			    "Cannot create Tx rings %d. %d rings available\n",
-			    queue_idx, BNXT_MAX_VF_REP_RINGS);
+			    queue_idx, rep_bp->rx_nr_rings);
 		return -EINVAL;
 	}
 
@@ -805,10 +808,10 @@ int bnxt_rep_stats_get_op(struct rte_eth_dev *eth_dev,
 			     struct rte_eth_stats *stats)
 {
 	struct bnxt_representor *rep_bp = eth_dev->data->dev_private;
-	int i;
+	unsigned int i;
 
 	memset(stats, 0, sizeof(*stats));
-	for (i = 0; i < BNXT_MAX_VF_REP_RINGS; i++) {
+	for (i = 0; i < rep_bp->rx_nr_rings; i++) {
 		stats->obytes += rep_bp->tx_bytes[i];
 		stats->opackets += rep_bp->tx_pkts[i];
 		stats->ibytes += rep_bp->rx_bytes[i];
@@ -828,9 +831,9 @@ int bnxt_rep_stats_get_op(struct rte_eth_dev *eth_dev,
 int bnxt_rep_stats_reset_op(struct rte_eth_dev *eth_dev)
 {
 	struct bnxt_representor *rep_bp = eth_dev->data->dev_private;
-	int i;
+	unsigned int i;
 
-	for (i = 0; i < BNXT_MAX_VF_REP_RINGS; i++) {
+	for (i = 0; i < rep_bp->rx_nr_rings; i++) {
 		rep_bp->tx_pkts[i] = 0;
 		rep_bp->tx_bytes[i] = 0;
 		rep_bp->rx_pkts[i] = 0;