[PATCH v3 3/4] net/failsafe: replace sub-device pointer with port id

[Raslan Darawsheh <rasland@mellanox.com>]

In multiprocess context, the pointer to sub-device is shared between
processes. Previously, it was a pointer to per process eth_dev so
it's needed to replace this dependency.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Signed-off-by: Raslan Darawsheh <rasland@mellanox.com>
---
v2: - moved comment in fs_sdev about subs to this commit
    - added parenthesis around macro arguments.

v3: - replaced shared data with port id for sub dev.
    - update comment on the sub_dev struct
---
 drivers/net/failsafe/failsafe.c         |  6 ++++++
 drivers/net/failsafe/failsafe_eal.c     |  2 +-
 drivers/net/failsafe/failsafe_ether.c   |  1 +
 drivers/net/failsafe/failsafe_private.h | 17 +++++++++++------
 4 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
index 68926ca..e53a89d 100644
--- a/drivers/net/failsafe/failsafe.c
+++ b/drivers/net/failsafe/failsafe.c
@@ -30,6 +30,8 @@ fs_sub_device_alloc(struct rte_eth_dev *dev,
 	uint8_t nb_subs;
 	int ret;
 	int i;
+	struct sub_device *sdev;
+	uint8_t sdev_iterator;
 
 	ret = failsafe_args_count_subdevice(dev, params);
 	if (ret)
@@ -51,6 +53,10 @@ fs_sub_device_alloc(struct rte_eth_dev *dev,
 	for (i = 1; i < nb_subs; i++)
 		PRIV(dev)->subs[i - 1].next = PRIV(dev)->subs + i;
 	PRIV(dev)->subs[i - 1].next = PRIV(dev)->subs;
+
+	FOREACH_SUBDEV(sdev, sdev_iterator, dev) {
+		sdev->sdev_port_id = RTE_MAX_ETHPORTS;
+	}
 	return 0;
 }
 
diff --git a/drivers/net/failsafe/failsafe_eal.c b/drivers/net/failsafe/failsafe_eal.c
index 56d1669..74fd8e9 100644
--- a/drivers/net/failsafe/failsafe_eal.c
+++ b/drivers/net/failsafe/failsafe_eal.c
@@ -112,7 +112,7 @@ fs_bus_init(struct rte_eth_dev *dev)
 				continue;
 			}
 		}
-		ETH(sdev) = &rte_eth_devices[pid];
+		sdev->sdev_port_id = pid;
 		SUB_ID(sdev) = i;
 		sdev->fs_port_id = dev->data->port_id;
 		sdev->dev = ETH(sdev)->device;
diff --git a/drivers/net/failsafe/failsafe_ether.c b/drivers/net/failsafe/failsafe_ether.c
index 7fa209a..7ac23d4 100644
--- a/drivers/net/failsafe/failsafe_ether.c
+++ b/drivers/net/failsafe/failsafe_ether.c
@@ -294,6 +294,7 @@ fs_dev_remove(struct sub_device *sdev)
 	case DEV_PARSED:
 	case DEV_UNDEFINED:
 		sdev->state = DEV_UNDEFINED;
+		sdev->sdev_port_id = RTE_MAX_ETHPORTS;
 		/* the end */
 		break;
 	}
diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
index af0c9d1..2a632d8 100644
--- a/drivers/net/failsafe/failsafe_private.h
+++ b/drivers/net/failsafe/failsafe_private.h
@@ -100,13 +100,15 @@ struct fs_stats {
 	uint64_t timestamp;
 };
 
+/*
+ * Allocated in shared memory.
+ */
 struct sub_device {
 	/* Exhaustive DPDK device description */
 	struct sub_device *next;
 	struct rte_devargs devargs;
-	struct rte_bus *bus;
-	struct rte_device *dev;
-	struct rte_eth_dev *edev;
+	struct rte_bus *bus; /* for primary process only. */
+	struct rte_device *dev; /* for primary process only. */
 	uint8_t sid;
 	/* Device state machine */
 	enum dev_state state;
@@ -118,6 +120,8 @@ struct sub_device {
 	char *fd_str;
 	/* fail-safe device backreference */
 	uint16_t fs_port_id; /* shared between processes */
+	/* sub device port id*/
+	uint16_t sdev_port_id; /* shared between processes */
 	/* flag calling for recollection */
 	volatile unsigned int remove:1;
 	/* flow isolation state */
@@ -139,7 +143,7 @@ struct fs_priv {
 	 * subs[0] is the preferred device
 	 * any other is just another slave
 	 */
-	struct sub_device *subs;
+	struct sub_device *subs;  /* shared between processes */
 	uint8_t subs_head; /* if head == tail, no subs */
 	uint8_t subs_tail; /* first invalid */
 	uint8_t subs_tx; /* current emitting device */
@@ -254,11 +258,12 @@ extern int failsafe_mac_from_arg;
 
 /* sdev: (struct sub_device *) */
 #define ETH(sdev) \
-	((sdev)->edev)
+	((sdev)->sdev_port_id == RTE_MAX_ETHPORTS ? \
+	NULL : &rte_eth_devices[(sdev)->sdev_port_id])
 
 /* sdev: (struct sub_device *) */
 #define PORT_ID(sdev) \
-	(ETH(sdev)->data->port_id)
+	((sdev)->sdev_port_id)
 
 /* sdev: (struct sub_device *) */
 #define SUB_ID(sdev) \
-- 
2.7.4