[dpdk-dev] [PATCH 4/4] net/mlx4: fix secondary process attach port Tx queue

[Suanming Mou <suanmingm@nvidia.com>]

Currently, the secondary process port UAR register mapping used by Tx
queue is done during port initializing.

Unluckily, in port hot-plug case, the secondary process will be
requested to initialize the port when primary process probe the port.
At that time, the port Tx queue number is still not configured, the
secondary process get Tx queue number as 0. This causes the UAR register
not be mapped as secondary process get Tx queue number 0.

This commit adds the check of Tx queue number in secondary process when
port starts is requested. Once the Tx queue number is not matching, do
UAR mapping with the latest Tx queue number.

Fixes: 0203d33a1059 ("net/mlx4: support secondary process")
cc: stable@dpdk.org

Signed-off-by: Suanming Mou <suanmingm@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
---
 drivers/net/mlx4/mlx4.c      | 10 +++++-----
 drivers/net/mlx4/mlx4.h      |  4 ++++
 drivers/net/mlx4/mlx4_mp.c   | 24 ++++++++++++++++++++++++
 drivers/net/mlx4/mlx4_rxtx.h |  1 +
 drivers/net/mlx4/mlx4_txq.c  | 28 ++++++++++++++++++++++++++++
 5 files changed, 62 insertions(+), 5 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 495b4fc..919a934 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -195,7 +195,7 @@ struct mlx4_conf {
  * @return
  *   0 on success, a negative errno value otherwise and rte_errno is set.
  */
-static int
+int
 mlx4_proc_priv_init(struct rte_eth_dev *dev)
 {
 	struct mlx4_proc_priv *ppriv;
@@ -207,13 +207,13 @@ struct mlx4_conf {
 	 */
 	ppriv_size = sizeof(struct mlx4_proc_priv) +
 		     dev->data->nb_tx_queues * sizeof(void *);
-	ppriv = rte_malloc_socket("mlx4_proc_priv", ppriv_size,
-				  RTE_CACHE_LINE_SIZE, dev->device->numa_node);
+	ppriv = rte_zmalloc_socket("mlx4_proc_priv", ppriv_size,
+				   RTE_CACHE_LINE_SIZE, dev->device->numa_node);
 	if (!ppriv) {
 		rte_errno = ENOMEM;
 		return -rte_errno;
 	}
-	ppriv->uar_table_sz = ppriv_size;
+	ppriv->uar_table_sz = dev->data->nb_tx_queues;
 	dev->process_private = ppriv;
 	return 0;
 }
@@ -224,7 +224,7 @@ struct mlx4_conf {
  * @param dev
  *   Pointer to Ethernet device structure.
  */
-static void
+void
 mlx4_proc_priv_uninit(struct rte_eth_dev *dev)
 {
 	if (!dev->process_private)
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index c6cb294..87710d3 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -197,6 +197,10 @@ struct mlx4_priv {
 #define PORT_ID(priv) ((priv)->dev_data->port_id)
 #define ETH_DEV(priv) (&rte_eth_devices[PORT_ID(priv)])
 
+int mlx4_proc_priv_init(struct rte_eth_dev *dev);
+void mlx4_proc_priv_uninit(struct rte_eth_dev *dev);
+
+
 /* mlx4_ethdev.c */
 
 int mlx4_get_ifname(const struct mlx4_priv *priv, char (*ifname)[IF_NAMESIZE]);
diff --git a/drivers/net/mlx4/mlx4_mp.c b/drivers/net/mlx4/mlx4_mp.c
index eca0c20..3622d61 100644
--- a/drivers/net/mlx4/mlx4_mp.c
+++ b/drivers/net/mlx4/mlx4_mp.c
@@ -111,6 +111,9 @@
 	const struct mlx4_mp_param *param =
 		(const struct mlx4_mp_param *)mp_msg->param;
 	struct rte_eth_dev *dev;
+#ifdef HAVE_IBV_MLX4_UAR_MMAP_OFFSET
+	struct mlx4_proc_priv *ppriv;
+#endif
 	int ret;
 
 	MLX4_ASSERT(rte_eal_process_type() == RTE_PROC_SECONDARY);
@@ -126,6 +129,21 @@
 		rte_mb();
 		dev->tx_pkt_burst = mlx4_tx_burst;
 		dev->rx_pkt_burst = mlx4_rx_burst;
+#ifdef HAVE_IBV_MLX4_UAR_MMAP_OFFSET
+		ppriv = (struct mlx4_proc_priv *)dev->process_private;
+		if (ppriv->uar_table_sz != dev->data->nb_tx_queues) {
+			mlx4_tx_uar_uninit_secondary(dev);
+			mlx4_proc_priv_uninit(dev);
+			ret = mlx4_proc_priv_init(dev);
+			if (ret)
+				return -rte_errno;
+			ret = mlx4_tx_uar_init_secondary(dev, mp_msg->fds[0]);
+			if (ret) {
+				mlx4_proc_priv_uninit(dev);
+				return -rte_errno;
+			}
+		}
+#endif
 		mp_init_msg(dev, &mp_res, param->type);
 		res->result = 0;
 		ret = rte_mp_reply(&mp_res, peer);
@@ -163,6 +181,7 @@
 	struct rte_mp_reply mp_rep;
 	struct mlx4_mp_param *res __rte_unused;
 	struct timespec ts = {.tv_sec = MLX4_MP_REQ_TIMEOUT_SEC, .tv_nsec = 0};
+	struct mlx4_priv *priv;
 	int ret;
 	int i;
 
@@ -175,6 +194,11 @@
 		return;
 	}
 	mp_init_msg(dev, &mp_req, type);
+	if (type == MLX4_MP_REQ_START_RXTX) {
+		priv = dev->data->dev_private;
+		mp_req.num_fds = 1;
+		mp_req.fds[0] = priv->ctx->cmd_fd;
+	}
 	ret = rte_mp_request_sync(&mp_req, &mp_rep, &ts);
 	if (ret) {
 		if (rte_errno != ENOTSUP)
diff --git a/drivers/net/mlx4/mlx4_rxtx.h b/drivers/net/mlx4/mlx4_rxtx.h
index 9de6c59..136ca56 100644
--- a/drivers/net/mlx4/mlx4_rxtx.h
+++ b/drivers/net/mlx4/mlx4_rxtx.h
@@ -157,6 +157,7 @@ uint16_t mlx4_rx_burst_removed(void *dpdk_rxq, struct rte_mbuf **pkts,
 /* mlx4_txq.c */
 
 int mlx4_tx_uar_init_secondary(struct rte_eth_dev *dev, int fd);
+void mlx4_tx_uar_uninit_secondary(struct rte_eth_dev *dev);
 uint64_t mlx4_get_tx_port_offloads(struct mlx4_priv *priv);
 int mlx4_tx_queue_setup(struct rte_eth_dev *dev, uint16_t idx,
 			uint16_t desc, unsigned int socket,
diff --git a/drivers/net/mlx4/mlx4_txq.c b/drivers/net/mlx4/mlx4_txq.c
index 37b8441..60560d9 100644
--- a/drivers/net/mlx4/mlx4_txq.c
+++ b/drivers/net/mlx4/mlx4_txq.c
@@ -157,6 +157,27 @@
 	} while (i--);
 	return -rte_errno;
 }
+
+void
+mlx4_tx_uar_uninit_secondary(struct rte_eth_dev *dev)
+{
+	struct mlx4_proc_priv *ppriv =
+			(struct mlx4_proc_priv *)dev->process_private;
+	const size_t page_size = sysconf(_SC_PAGESIZE);
+	void *addr;
+	size_t i;
+
+	if (page_size == (size_t)-1) {
+		ERROR("Failed to get mem page size");
+		return;
+	}
+	for (i = 0; i < ppriv->uar_table_sz; i++) {
+		addr = ppriv->uar_table[i];
+		if (addr)
+			munmap(RTE_PTR_ALIGN_FLOOR(addr, page_size), page_size);
+	}
+}
+
 #else
 int
 mlx4_tx_uar_init_secondary(struct rte_eth_dev *dev __rte_unused,
@@ -167,6 +188,13 @@
 	rte_errno = ENOTSUP;
 	return -rte_errno;
 }
+
+void
+mlx4_tx_uar_uninit_secondary(struct rte_eth_dev *dev __rte_unused)
+{
+	assert(rte_eal_process_type() == RTE_PROC_SECONDARY);
+	ERROR("UAR remap is not supported");
+}
 #endif
 
 /**
-- 
1.8.3.1