From 8fbce96fbed60ac6fada000b30d5671e2136eeb5 Mon Sep 17 00:00:00 2001 From: Dariusz Sosnowski Date: Tue, 23 Nov 2021 17:38:05 +0200 Subject: [PATCH] net/mlx5: fix reference count on detached indirect action This patch fixes segfault which was triggered when port, with indirect actions created, was closed. Segfault was occurring only when RTE_LIBRTE_MLX5_DEBUG was defined. It was caused by redundant decrement of RX queues refcount: - refcount was decremented when port was stopped and indirect actions were detached from RX queues (port stop), - refcount was decremented when indirect actions objects were destroyed (port close or destroying of indirect action). This patch fixes behavior. Dereferencing Rx queues is done if and only if indirect action is explicitly destroyed by the user or detached on port stop. Dereferencing Rx queues on action destroy operation depends on an argument to the wrapper of indirect action destroy operation, introduced in this patch. Fixes: ec4e11d41d12 ("net/mlx5: preserve indirect actions on restart") Cc: stable@dpdk.org Signed-off-by: Dariusz Sosnowski Acked-by: Matan Azrad --- drivers/net/mlx5/mlx5_flow_dv.c | 5 +++-- drivers/net/mlx5/mlx5_rx.h | 3 ++- drivers/net/mlx5/mlx5_rxq.c | 21 ++++++++++++++------- 3 files changed, 19 insertions(+), 10 deletions(-) diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c index f5356418fa..9d4bd0560c 100644 --- a/drivers/net/mlx5/mlx5_flow_dv.c +++ b/drivers/net/mlx5/mlx5_flow_dv.c @@ -14740,7 +14740,7 @@ __flow_dv_action_rss_setup(struct rte_eth_dev *dev, error_hrxq_new: err = rte_errno; __flow_dv_action_rss_hrxqs_release(dev, shared_rss); - if (!mlx5_ind_table_obj_release(dev, shared_rss->ind_tbl, true)) + if (!mlx5_ind_table_obj_release(dev, shared_rss->ind_tbl, true, true)) shared_rss->ind_tbl = NULL; rte_errno = err; return -rte_errno; @@ -14883,7 +14883,8 @@ __flow_dv_action_rss_release(struct rte_eth_dev *dev, uint32_t idx, NULL, "shared rss hrxq has references"); queue = shared_rss->ind_tbl->queues; - remaining = mlx5_ind_table_obj_release(dev, shared_rss->ind_tbl, true); + remaining = mlx5_ind_table_obj_release(dev, shared_rss->ind_tbl, true, + !!dev->data->dev_started); if (remaining) return rte_flow_error_set(error, EBUSY, RTE_FLOW_ERROR_TYPE_ACTION, diff --git a/drivers/net/mlx5/mlx5_rx.h b/drivers/net/mlx5/mlx5_rx.h index 9cc1a2703b..b19464bb37 100644 --- a/drivers/net/mlx5/mlx5_rx.h +++ b/drivers/net/mlx5/mlx5_rx.h @@ -225,7 +225,8 @@ struct mlx5_ind_table_obj *mlx5_ind_table_obj_get(struct rte_eth_dev *dev, uint32_t queues_n); int mlx5_ind_table_obj_release(struct rte_eth_dev *dev, struct mlx5_ind_table_obj *ind_tbl, - bool standalone); + bool standalone, + bool deref_rxqs); int mlx5_ind_table_obj_setup(struct rte_eth_dev *dev, struct mlx5_ind_table_obj *ind_tbl); int mlx5_ind_table_obj_modify(struct rte_eth_dev *dev, diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c index e406779faf..47dc24793b 100644 --- a/drivers/net/mlx5/mlx5_rxq.c +++ b/drivers/net/mlx5/mlx5_rxq.c @@ -2195,6 +2195,9 @@ mlx5_ind_table_obj_get(struct rte_eth_dev *dev, const uint16_t *queues, * Indirection table to release. * @param standalone * Indirection table for Standalone queue. + * @param deref_rxqs + * If true, then dereference RX queues related to indirection table. + * Otherwise, no additional action will be taken. * * @return * 1 while a reference on it exists, 0 when freed. @@ -2202,7 +2205,8 @@ mlx5_ind_table_obj_get(struct rte_eth_dev *dev, const uint16_t *queues, int mlx5_ind_table_obj_release(struct rte_eth_dev *dev, struct mlx5_ind_table_obj *ind_tbl, - bool standalone) + bool standalone, + bool deref_rxqs) { struct mlx5_priv *priv = dev->data->dev_private; unsigned int i, ret; @@ -2215,8 +2219,10 @@ mlx5_ind_table_obj_release(struct rte_eth_dev *dev, if (ret) return 1; priv->obj_ops.ind_table_destroy(ind_tbl); - for (i = 0; i != ind_tbl->queues_n; ++i) - claim_nonzero(mlx5_rxq_deref(dev, ind_tbl->queues[i])); + if (deref_rxqs) { + for (i = 0; i != ind_tbl->queues_n; ++i) + claim_nonzero(mlx5_rxq_deref(dev, ind_tbl->queues[i])); + } mlx5_free(ind_tbl); return 0; } @@ -2573,7 +2579,7 @@ mlx5_hrxq_modify(struct rte_eth_dev *dev, uint32_t hrxq_idx, if (ind_tbl != hrxq->ind_table) { MLX5_ASSERT(!hrxq->standalone); mlx5_ind_table_obj_release(dev, hrxq->ind_table, - hrxq->standalone); + hrxq->standalone, true); hrxq->ind_table = ind_tbl; } hrxq->hash_fields = hash_fields; @@ -2583,7 +2589,8 @@ error: err = rte_errno; if (ind_tbl != hrxq->ind_table) { MLX5_ASSERT(!hrxq->standalone); - mlx5_ind_table_obj_release(dev, ind_tbl, hrxq->standalone); + mlx5_ind_table_obj_release(dev, ind_tbl, hrxq->standalone, + true); } rte_errno = err; return -rte_errno; @@ -2600,7 +2607,7 @@ __mlx5_hrxq_remove(struct rte_eth_dev *dev, struct mlx5_hrxq *hrxq) priv->obj_ops.hrxq_destroy(hrxq); if (!hrxq->standalone) { mlx5_ind_table_obj_release(dev, hrxq->ind_table, - hrxq->standalone); + hrxq->standalone, true); } mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq->idx); } @@ -2666,7 +2673,7 @@ __mlx5_hrxq_create(struct rte_eth_dev *dev, return hrxq; error: if (!rss_desc->ind_tbl) - mlx5_ind_table_obj_release(dev, ind_tbl, standalone); + mlx5_ind_table_obj_release(dev, ind_tbl, standalone, true); if (hrxq) mlx5_ipool_free(priv->sh->ipool[MLX5_IPOOL_HRXQ], hrxq_idx); return NULL; -- 2.20.1