[dpdk-dev] [PATCH v2] net/bnxt: fix cp ring size calculation
From: Lance Richardson <hidden>
Date: 2021-01-29 18:07:20
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The size of the receive completion ring should be recalculated
when MTU is increased to a size that requires scattered receive
or when LRO is enabled. Move logic for this calculation from
the ring configuration path to the device start path.
- Made size calculation dependent only on scattered_rx
status.
- Moved calculation of scattered_rx up in the initialization
sequence.
- Made LRO offload status part of scattered_rx calculation.
When the completion ring size is too small, completion overflows
can occur causing the ring to be disabled in hardware.
Fixes: 04067844a3e9 ("net/bnxt: reduce CQ queue size without aggregation ring")
Cc: stable@dpdk.org
Signed-off-by: Lance Richardson <redacted>
Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde@broadcom.com>
---
v2: Fixed conflict resolution mistake (two missing hunks).
drivers/net/bnxt/bnxt_ethdev.c | 6 +++++-
drivers/net/bnxt/bnxt_ring.c | 22 ++++++++++++++++++++++
drivers/net/bnxt/bnxt_rxr.c | 15 +--------------
3 files changed, 28 insertions(+), 15 deletions(-)
diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
index ec88cb0046..ca779726ec 100644
--- a/drivers/net/bnxt/bnxt_ethdev.c
+++ b/drivers/net/bnxt/bnxt_ethdev.c@@ -1143,6 +1143,9 @@ static int bnxt_scattered_rx(struct rte_eth_dev *eth_dev) if (eth_dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_SCATTER) return 1; + if (eth_dev->data->dev_conf.rxmode.offloads & DEV_RX_OFFLOAD_TCP_LRO) + return 1; + for (i = 0; i < eth_dev->data->nb_rx_queues; i++) { struct bnxt_rx_queue *rxq = eth_dev->data->rx_queues[i];
@@ -1418,11 +1421,12 @@ static int bnxt_dev_start_op(struct rte_eth_dev *eth_dev) bnxt_enable_int(bp); + eth_dev->data->scattered_rx = bnxt_scattered_rx(eth_dev); + rc = bnxt_start_nic(bp); if (rc) goto error; - eth_dev->data->scattered_rx = bnxt_scattered_rx(eth_dev); eth_dev->data->dev_started = 1; bnxt_link_update_op(eth_dev, 1);
diff --git a/drivers/net/bnxt/bnxt_ring.c b/drivers/net/bnxt/bnxt_ring.c
index 4e513244a6..ba23c1fa03 100644
--- a/drivers/net/bnxt/bnxt_ring.c
+++ b/drivers/net/bnxt/bnxt_ring.c@@ -583,6 +583,17 @@ int bnxt_alloc_hwrm_rx_ring(struct bnxt *bp, int queue_index) struct bnxt_rx_ring_info *rxr = rxq->rx_ring; int rc; + /* + * Storage for the cp ring is allocated based on worst-case + * usage, the actual size to be used by hw is computed here. + */ + cp_ring->ring_size = rxr->rx_ring_struct->ring_size * 2; + + if (bp->eth_dev->data->scattered_rx) + cp_ring->ring_size *= AGG_RING_SIZE_FACTOR; + + cp_ring->ring_mask = cp_ring->ring_size - 1; + rc = bnxt_alloc_cmpl_ring(bp, queue_index, cpr); if (rc) goto err_out;
@@ -693,6 +704,17 @@ int bnxt_alloc_hwrm_rings(struct bnxt *bp) struct bnxt_ring *cp_ring = cpr->cp_ring_struct; struct bnxt_rx_ring_info *rxr = rxq->rx_ring; + /* + * Storage for the cp ring is allocated based on worst-case + * usage, the actual size to be used by hw is computed here. + */ + cp_ring->ring_size = rxr->rx_ring_struct->ring_size * 2; + + if (bp->eth_dev->data->scattered_rx) + cp_ring->ring_size *= AGG_RING_SIZE_FACTOR; + + cp_ring->ring_mask = cp_ring->ring_size - 1; + if (bnxt_alloc_cmpl_ring(bp, i, cpr)) goto err_out;
diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
index 8c2781c968..4674f7cea2 100644
--- a/drivers/net/bnxt/bnxt_rxr.c
+++ b/drivers/net/bnxt/bnxt_rxr.c@@ -1116,12 +1116,9 @@ void bnxt_free_rx_rings(struct bnxt *bp) int bnxt_init_rx_ring_struct(struct bnxt_rx_queue *rxq, unsigned int socket_id) { - struct rte_eth_dev *eth_dev = rxq->bp->eth_dev; - struct rte_eth_rxmode *rxmode; struct bnxt_cp_ring_info *cpr; struct bnxt_rx_ring_info *rxr; struct bnxt_ring *ring; - bool use_agg_ring; rxq->rx_buf_size = BNXT_MAX_PKT_LEN + sizeof(struct rte_mbuf);
@@ -1164,19 +1161,9 @@ int bnxt_init_rx_ring_struct(struct bnxt_rx_queue *rxq, unsigned int socket_id) return -ENOMEM; cpr->cp_ring_struct = ring; - rxmode = ð_dev->data->dev_conf.rxmode; - use_agg_ring = (rxmode->offloads & DEV_RX_OFFLOAD_SCATTER) || - (rxmode->offloads & DEV_RX_OFFLOAD_TCP_LRO) || - (rxmode->max_rx_pkt_len > - (uint32_t)(rte_pktmbuf_data_room_size(rxq->mb_pool) - - RTE_PKTMBUF_HEADROOM)); - /* Allocate two completion slots per entry in desc ring. */ ring->ring_size = rxr->rx_ring_struct->ring_size * 2; - - /* Allocate additional slots if aggregation ring is in use. */ - if (use_agg_ring) - ring->ring_size *= AGG_RING_SIZE_FACTOR; + ring->ring_size *= AGG_RING_SIZE_FACTOR; ring->ring_size = rte_align32pow2(ring->ring_size); ring->ring_mask = ring->ring_size - 1;
--
2.25.1