[dpdk-dev] [PATCH v1 03/16] net/mlx5: fix UAR lock sharing for multiport devices

[Viacheslav Ovsiienko <viacheslavo@mellanox.com>]

The master and representors might be created over the multiport
Infiniband devices and the UAR resource allocated for sibling
ports might belong to the same underlying Infiniband device.
Hardware requires the write access to the UAR must be performed
as atomic 64-bit write, on 32-bit systems this is two sequential
writes, protected by lock. Due to possibility to share the same
UAR between sibling devices the locks must be moved to shared
context.

Fixes: f048f3d479a6 ("net/mlx5: switch to the shared IB device context")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/linux/mlx5_os.c |  6 ------
 drivers/net/mlx5/mlx5.c          |  6 ++++++
 drivers/net/mlx5/mlx5.h          | 10 +++++-----
 drivers/net/mlx5/mlx5_rxq.c      |  2 +-
 drivers/net/mlx5/mlx5_txq.c      |  2 +-
 5 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index daccd1c..7abb85d 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -630,12 +630,6 @@
 	priv->mtu = RTE_ETHER_MTU;
 	priv->mp_id.port_id = port_id;
 	strlcpy(priv->mp_id.name, MLX5_MP_NAME, RTE_MP_MAX_NAME_LEN);
-#ifndef RTE_ARCH_64
-	/* Initialize UAR access locks for 32bit implementations. */
-	rte_spinlock_init(&priv->uar_lock_cq);
-	for (i = 0; i < MLX5_UAR_PAGE_NUM_MAX; i++)
-		rte_spinlock_init(&priv->uar_lock[i]);
-#endif
 	/* Some internal functions rely on Netlink sockets, open them now. */
 	priv->nl_socket_rdma = mlx5_nl_init(NETLINK_RDMA);
 	priv->nl_socket_route =	mlx5_nl_init(NETLINK_ROUTE);
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 13242a5..2efbc03 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -717,6 +717,12 @@ struct mlx5_dev_ctx_shared *
 		err = ENOMEM;
 		goto error;
 	}
+#ifndef RTE_ARCH_64
+	/* Initialize UAR access locks for 32bit implementations. */
+	rte_spinlock_init(&sh->uar_lock_cq);
+	for (i = 0; i < MLX5_UAR_PAGE_NUM_MAX; i++)
+		rte_spinlock_init(&sh->uar_lock[i]);
+#endif
 	/*
 	 * Once the device is added to the list of memory event
 	 * callback, its global MR cache table cannot be expanded
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 84cd3e1..d01d7f3 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -559,6 +559,11 @@ struct mlx5_dev_ctx_shared {
 	void *fdb_domain; /* FDB Direct Rules name space handle. */
 	void *rx_domain; /* RX Direct Rules name space handle. */
 	void *tx_domain; /* TX Direct Rules name space handle. */
+#ifndef RTE_ARCH_64
+	rte_spinlock_t uar_lock_cq; /* CQs share a common distinct UAR */
+	rte_spinlock_t uar_lock[MLX5_UAR_PAGE_NUM_MAX];
+	/* UAR same-page access control required in 32bit implementations. */
+#endif
 	struct mlx5_hlist *flow_tbls;
 	/* Direct Rules tables for FDB, NIC TX+RX */
 	void *esw_drop_action; /* Pointer to DR E-Switch drop action. */
@@ -673,11 +678,6 @@ struct mlx5_priv {
 	uint8_t mtr_color_reg; /* Meter color match REG_C. */
 	struct mlx5_mtr_profiles flow_meter_profiles; /* MTR profile list. */
 	struct mlx5_flow_meters flow_meters; /* MTR list. */
-#ifndef RTE_ARCH_64
-	rte_spinlock_t uar_lock_cq; /* CQs share a common distinct UAR */
-	rte_spinlock_t uar_lock[MLX5_UAR_PAGE_NUM_MAX];
-	/* UAR same-page access control required in 32bit implementations. */
-#endif
 	uint8_t skip_default_rss_reta; /* Skip configuration of default reta. */
 	uint8_t fdb_def_rule; /* Whether fdb jump to table 1 is configured. */
 	struct mlx5_mp_id mp_id; /* ID of a multi-process process */
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index b436f06..2681322 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -1997,7 +1997,7 @@ struct mlx5_rxq_ctrl *
 	tmpl->rxq.elts =
 		(struct rte_mbuf *(*)[1 << tmpl->rxq.elts_n])(tmpl + 1);
 #ifndef RTE_ARCH_64
-	tmpl->rxq.uar_lock_cq = &priv->uar_lock_cq;
+	tmpl->rxq.uar_lock_cq = &priv->sh->uar_lock_cq;
 #endif
 	tmpl->rxq.idx = idx;
 	rte_atomic32_inc(&tmpl->refcnt);
diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c
index 35b3ade..e1fa24e 100644
--- a/drivers/net/mlx5/mlx5_txq.c
+++ b/drivers/net/mlx5/mlx5_txq.c
@@ -355,7 +355,7 @@
 	/* Assign an UAR lock according to UAR page number */
 	lock_idx = (txq_ctrl->uar_mmap_offset / page_size) &
 		   MLX5_UAR_PAGE_NUM_MASK;
-	txq_ctrl->txq.uar_lock = &priv->uar_lock[lock_idx];
+	txq_ctrl->txq.uar_lock = &priv->sh->uar_lock[lock_idx];
 #endif
 }
 
-- 
1.8.3.1