[dpdk-dev] [PATCH v2 4/5] net/mlx5: add mlx5 APIs for single flow dump feature

[Haifei Luo <haifeil@nvidia.com>]

Modify API mlx5_flow_dev_dump to support the feature.
Modify mlx5_socket since one extra arg flow_ptr is added.

Signed-off-by: Haifei Luo <haifeil@nvidia.com>
---
 drivers/net/mlx5/linux/mlx5_socket.c | 30 ++++++++++++++++++++++++------
 drivers/net/mlx5/mlx5_flow.c         | 29 +++++++++++++++++++++++++++--
 2 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/drivers/net/mlx5/linux/mlx5_socket.c b/drivers/net/mlx5/linux/mlx5_socket.c
index 6e354f4..2ef837c 100644
--- a/drivers/net/mlx5/linux/mlx5_socket.c
+++ b/drivers/net/mlx5/linux/mlx5_socket.c
@@ -2,6 +2,10 @@
  * Copyright 2019 Mellanox Technologies, Ltd
  */
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
@@ -29,11 +33,15 @@
 {
 	int conn_sock;
 	int ret;
+	int j;
 	struct cmsghdr *cmsg = NULL;
-	int data;
+	#define LENGTH 9
+	/* The first byte for port_id and the rest for flowptr. */
+	int data[LENGTH];
+	uint64_t flow_ptr = 0;
 	char buf[CMSG_SPACE(sizeof(int))] = { 0 };
 	struct iovec io = {
-		.iov_base = &data,
+		.iov_base = &data[0],
 		.iov_len = sizeof(data),
 	};
 	struct msghdr msg = {
@@ -46,7 +54,9 @@
 	int fd;
 	FILE *file = NULL;
 	struct rte_eth_dev *dev;
+	struct rte_flow_error err;
 
+	memset(data, 0, sizeof(data));
 	/* Accept the connection from the client. */
 	conn_sock = accept(server_socket, NULL, NULL);
 	if (conn_sock < 0) {
@@ -84,15 +94,23 @@
 	}
 	/* Dump flow. */
 	dev = &rte_eth_devices[port_id];
-	ret = mlx5_flow_dev_dump(dev, NULL, file, NULL);
+	/* The first byte in data for port_id and the following 8 for flowptr */
+	for (j = 1; j < LENGTH; j++)
+		flow_ptr = (flow_ptr << 8) + data[j];
+	if (flow_ptr == 0)
+		ret = mlx5_flow_dev_dump(dev, NULL, file, NULL);
+	else
+		ret = mlx5_flow_dev_dump(dev,
+			(struct rte_flow *)((uintptr_t)flow_ptr), file, &err);
+
 	/* Set-up the ancillary data and reply. */
 	msg.msg_controllen = 0;
 	msg.msg_control = NULL;
 	msg.msg_iovlen = 1;
 	msg.msg_iov = &io;
-	data = -ret;
-	io.iov_len = sizeof(data);
-	io.iov_base = &data;
+	data[0] = -ret;
+	io.iov_len = sizeof(data[0]);
+	io.iov_base = &data[0];
 	do {
 		ret = sendmsg(conn_sock, &msg, 0);
 	} while (ret < 0 && errno == EINTR);
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index bce6ab2..b68909f 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -7183,10 +7183,35 @@ struct mlx5_meter_domains_infos *
 		return -ENOTSUP;
 	}
 
+	/*dump all*/
 	if (!flow_idx)
 		return mlx5_devx_cmd_flow_dump(sh->fdb_domain,
-				sh->rx_domain, sh->tx_domain, file);
-	return -ENOTSUP;
+					sh->rx_domain,
+					sh->tx_domain, file);
+	/*dump one*/
+	uint32_t handle_idx;
+	int ret;
+	struct mlx5_flow_handle *dh;
+	struct rte_flow *flow = mlx5_ipool_get(priv->sh->ipool
+		[MLX5_IPOOL_RTE_FLOW], (uintptr_t)(void *)flow_idx);
+
+	if (!flow)
+		return -ENOENT;
+	handle_idx = flow->dev_handles;
+	while (handle_idx) {
+		dh = mlx5_ipool_get(priv->sh->ipool[MLX5_IPOOL_MLX5_FLOW],
+				handle_idx);
+		if (!dh)
+			return -ENOENT;
+		if (dh->drv_flow) {
+			ret = mlx5_devx_cmd_flow_single_dump(dh->drv_flow,
+					file);
+			if (ret)
+				return -ENOENT;
+		}
+		handle_idx = dh->next.next;
+	}
+	return 0;
 }
 
 /**
-- 
1.8.3.1