From: Sriharsha Basavapatna Date: Fri, 28 Aug 2020 11:13:22 +0000 (-0400) Subject: net/bnxt: fix max rings computation X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=c72fe7ac3b63629f1f46e4d91d9abc0d7c064d93;p=dpdk.git net/bnxt: fix max rings computation The current max_rings computation does not take into account the case when max_nq_rings is <= num_async_cpr. This results in a wrong value like 0, when max_nq_rings is 1. Fix this by subtracting num_async_cpr only when max_cp_rings > num_async_cpr. Apart from this, the entire logic is currently spread across a few macros, making it hard to read and debug this code. Move this code into an inline function. max_msix is not used in the max_rings calculation. Apparently the max_msix field returned in HWRM_RESC_QCAPS is only valid for Thor and newer chips. On Wh+ it will be equal to min_compl_rings. Also, when a function reset is performed on an application quit, FW will not reset the VF resource pool as per design. This can lead to a strange condition wherein the max_msix field on Wh+ keeps changing on each application re-load thereby throwing throwing off the max_rings computation. Fixes: f03e66cb64ce ("net/bnxt: limit queue count for NS3/Stingray devices") Cc: stable@dpdk.org Signed-off-by: Sriharsha Basavapatna Signed-off-by: Somnath Kotur Reviewed-by: Ajit Khaparde --- diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h index 9c1c87489e..bc0935272a 100644 --- a/drivers/net/bnxt/bnxt.h +++ b/drivers/net/bnxt/bnxt.h @@ -752,19 +752,6 @@ struct bnxt { uint16_t max_tx_rings; uint16_t max_rx_rings; #define MAX_STINGRAY_RINGS 128U -/* For sake of symmetry, max Tx rings == max Rx rings, one stat ctx for each */ -#define BNXT_MAX_RX_RINGS(bp) \ - (BNXT_STINGRAY(bp) ? RTE_MIN(RTE_MIN(bp->max_rx_rings / 2U, \ - MAX_STINGRAY_RINGS), \ - bp->max_stat_ctx / 2U) : \ - RTE_MIN(bp->max_rx_rings / 2U, \ - bp->max_stat_ctx / 2U)) -#define BNXT_MAX_TX_RINGS(bp) \ - (RTE_MIN((bp)->max_tx_rings, BNXT_MAX_RX_RINGS(bp))) - -#define BNXT_MAX_RINGS(bp) \ - (RTE_MIN((((bp)->max_cp_rings - BNXT_NUM_ASYNC_CPR(bp)) / 2U), \ - BNXT_MAX_TX_RINGS(bp))) #define BNXT_MAX_VF_REP_RINGS 8 @@ -822,6 +809,34 @@ struct bnxt { uint16_t tx_cfa_action; }; +static +inline uint16_t bnxt_max_rings(struct bnxt *bp) +{ + 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; + uint16_t max_rings; + + /* For the sake of symmetry: + * max Tx rings == max Rx rings, one stat ctx for each. + */ + if (BNXT_STINGRAY(bp)) { + max_rx_rings = RTE_MIN(RTE_MIN(max_rx_rings / 2U, + MAX_STINGRAY_RINGS), + bp->max_stat_ctx / 2U); + } else { + max_rx_rings = RTE_MIN(max_rx_rings / 2U, + bp->max_stat_ctx / 2U); + } + + 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); + max_rings = RTE_MIN(max_cp_rings / 2U, max_tx_rings); + + return max_rings; +} + #define BNXT_FC_TIMER 1 /* Timer freq in Sec Flow Counters */ /** diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c index 0b14ca2342..bf89635776 100644 --- a/drivers/net/bnxt/bnxt_ethdev.c +++ b/drivers/net/bnxt/bnxt_ethdev.c @@ -920,7 +920,7 @@ static int bnxt_dev_info_get_op(struct rte_eth_dev *eth_dev, if (BNXT_PF(bp)) dev_info->max_vfs = pdev->max_vfs; - max_rx_rings = BNXT_MAX_RINGS(bp); + max_rx_rings = bnxt_max_rings(bp); /* 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; diff --git a/drivers/net/bnxt/bnxt_rxq.c b/drivers/net/bnxt/bnxt_rxq.c index 328cc994da..19e11e47bf 100644 --- a/drivers/net/bnxt/bnxt_rxq.c +++ b/drivers/net/bnxt/bnxt_rxq.c @@ -311,7 +311,7 @@ int bnxt_rx_queue_setup_op(struct rte_eth_dev *eth_dev, if (rc) return rc; - if (queue_idx >= BNXT_MAX_RINGS(bp)) { + if (queue_idx >= bnxt_max_rings(bp)) { PMD_DRV_LOG(ERR, "Cannot create Rx ring %d. Only %d rings available\n", queue_idx, bp->max_rx_rings); @@ -364,8 +364,9 @@ int bnxt_rx_queue_setup_op(struct rte_eth_dev *eth_dev, eth_dev->data->rx_queues[queue_idx] = rxq; /* Allocate RX ring hardware descriptors */ - if (bnxt_alloc_rings(bp, queue_idx, NULL, rxq, rxq->cp_ring, NULL, - "rxr")) { + rc = bnxt_alloc_rings(bp, queue_idx, NULL, rxq, rxq->cp_ring, NULL, + "rxr"); + if (rc) { PMD_DRV_LOG(ERR, "ring_dma_zone_reserve for rx_ring failed!\n"); goto err; diff --git a/drivers/net/bnxt/bnxt_txq.c b/drivers/net/bnxt/bnxt_txq.c index c9792a2af2..99a31cef28 100644 --- a/drivers/net/bnxt/bnxt_txq.c +++ b/drivers/net/bnxt/bnxt_txq.c @@ -98,7 +98,7 @@ int bnxt_tx_queue_setup_op(struct rte_eth_dev *eth_dev, if (rc) return rc; - if (queue_idx >= BNXT_MAX_RINGS(bp)) { + if (queue_idx >= bnxt_max_rings(bp)) { PMD_DRV_LOG(ERR, "Cannot create Tx ring %d. Only %d rings available\n", queue_idx, bp->max_tx_rings);