From fc4bfea59696cfba397c31ec842b6656fc27f50a Mon Sep 17 00:00:00 2001 From: Lance Richardson Date: Mon, 4 Nov 2019 15:27:47 -0500 Subject: [PATCH] net/bnxt: fix Rx queue start/stop for Thor based NICs Controller-specific handling is required for Thor-based NICs when stopping or starting a receive queue, otherwise packet reception may not be reliably resumed when a stopped receive queue is restarted: - The VNIC default receive ring needs to be recomputed when a receive queue is stopped or started. - When stopping the last (or only) receive queue for a given VNIC, ensure that no packets can reach the default receive ring by temporarily setting the VNIC MRU to zero. Fixes: f8168ca0e690 ("net/bnxt: support thor controller") Cc: stable@dpdk.org Signed-off-by: Lance Richardson Reviewed-by: Ajit Khaparde --- drivers/net/bnxt/bnxt_hwrm.c | 27 +++++++++++++++++++++---- drivers/net/bnxt/bnxt_rxq.c | 38 +++++++++++++++++++++++++++++++++--- 2 files changed, 58 insertions(+), 7 deletions(-) diff --git a/drivers/net/bnxt/bnxt_hwrm.c b/drivers/net/bnxt/bnxt_hwrm.c index bb4dcf4b27..2cba007ea2 100644 --- a/drivers/net/bnxt/bnxt_hwrm.c +++ b/drivers/net/bnxt/bnxt_hwrm.c @@ -1696,10 +1696,29 @@ int bnxt_hwrm_vnic_cfg(struct bnxt *bp, struct bnxt_vnic_info *vnic) HWRM_PREP(req, VNIC_CFG, BNXT_USE_CHIMP_MB); if (BNXT_CHIP_THOR(bp)) { - struct bnxt_rx_queue *rxq = - bp->eth_dev->data->rx_queues[vnic->start_grp_id]; - struct bnxt_rx_ring_info *rxr = rxq->rx_ring; - struct bnxt_cp_ring_info *cpr = rxq->cp_ring; + int dflt_rxq = vnic->start_grp_id; + struct bnxt_rx_ring_info *rxr; + struct bnxt_cp_ring_info *cpr; + struct bnxt_rx_queue *rxq; + int i; + + /* + * The first active receive ring is used as the VNIC + * default receive ring. If there are no active receive + * rings (all corresponding receive queues are stopped), + * the first receive ring is used. + */ + for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++) { + rxq = bp->eth_dev->data->rx_queues[i]; + if (rxq->rx_started) { + dflt_rxq = i; + break; + } + } + + rxq = bp->eth_dev->data->rx_queues[dflt_rxq]; + rxr = rxq->rx_ring; + cpr = rxq->cp_ring; req.default_rx_ring_id = rte_cpu_to_le_16(rxr->rx_ring_struct->fw_ring_id); diff --git a/drivers/net/bnxt/bnxt_rxq.c b/drivers/net/bnxt/bnxt_rxq.c index e82eda9d76..e7c012f68e 100644 --- a/drivers/net/bnxt/bnxt_rxq.c +++ b/drivers/net/bnxt/bnxt_rxq.c @@ -451,6 +451,10 @@ int bnxt_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id) if (rc) return rc; + if (BNXT_CHIP_THOR(bp)) { + /* Reconfigure default receive ring and MRU. */ + bnxt_hwrm_vnic_cfg(bp, rxq->vnic); + } PMD_DRV_LOG(INFO, "Rx queue started %d\n", rx_queue_id); if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) { @@ -491,7 +495,8 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id) struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf; struct bnxt_vnic_info *vnic = NULL; struct bnxt_rx_queue *rxq = NULL; - int rc = 0; + int active_queue_cnt = 0; + int i, rc = 0; rc = is_bnxt_in_error(bp); if (rc) @@ -507,8 +512,9 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id) } rxq = bp->rx_queues[rx_queue_id]; + vnic = rxq->vnic; - if (rxq == NULL) { + if (!rxq || !vnic) { PMD_DRV_LOG(ERR, "Invalid Rx queue %d\n", rx_queue_id); return -EINVAL; } @@ -518,7 +524,6 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id) PMD_DRV_LOG(DEBUG, "Rx queue stopped\n"); if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG) { - vnic = rxq->vnic; if (BNXT_HAS_RING_GRPS(bp)) vnic->fw_grp_ids[rx_queue_id] = INVALID_HW_RING_ID; @@ -526,6 +531,33 @@ int bnxt_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id) rc = bnxt_vnic_rss_configure(bp, vnic); } + if (BNXT_CHIP_THOR(bp)) { + /* Compute current number of active receive queues. */ + for (i = vnic->start_grp_id; i < vnic->end_grp_id; i++) + if (bp->rx_queues[i]->rx_started) + active_queue_cnt++; + + /* + * For Thor, we need to ensure that the VNIC default receive + * ring corresponds to an active receive queue. When no queue + * is active, we need to temporarily set the MRU to zero so + * that packets are dropped early in the receive pipeline in + * order to prevent the VNIC default receive ring from being + * accessed. + */ + if (active_queue_cnt == 0) { + uint16_t saved_mru = vnic->mru; + + vnic->mru = 0; + /* Reconfigure default receive ring and MRU. */ + bnxt_hwrm_vnic_cfg(bp, vnic); + vnic->mru = saved_mru; + } else { + /* Reconfigure default receive ring. */ + bnxt_hwrm_vnic_cfg(bp, vnic); + } + } + if (rc == 0) bnxt_rx_queue_release_mbufs(rxq); -- 2.20.1