[PATCH v2 3/4] net/failsafe: replace local sub-device with shared data

[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.
---
 drivers/net/failsafe/failsafe_eal.c     |  2 +-
 drivers/net/failsafe/failsafe_ether.c   |  7 ++++---
 drivers/net/failsafe/failsafe_private.h | 13 ++++++++-----
 3 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/drivers/net/failsafe/failsafe_eal.c b/drivers/net/failsafe/failsafe_eal.c
index 56d1669..6fac4b6 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->data = rte_eth_devices[pid].data;
 		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 d5b1488..e1fff59 100644
--- a/drivers/net/failsafe/failsafe_ether.c
+++ b/drivers/net/failsafe/failsafe_ether.c
@@ -267,18 +267,19 @@ static void
 fs_dev_remove(struct sub_device *sdev)
 {
 	int ret;
+	struct rte_eth_dev *edev = ETH(sdev);
 
 	if (sdev == NULL)
 		return;
 	switch (sdev->state) {
 	case DEV_STARTED:
 		failsafe_rx_intr_uninstall_subdevice(sdev);
-		rte_eth_dev_stop(PORT_ID(sdev));
+		rte_eth_dev_stop(edev->data->port_id);
 		sdev->state = DEV_ACTIVE;
 		/* fallthrough */
 	case DEV_ACTIVE:
 		failsafe_eth_dev_unregister_callbacks(sdev);
-		rte_eth_dev_close(PORT_ID(sdev));
+		rte_eth_dev_close(edev->data->port_id);
 		sdev->state = DEV_PROBED;
 		/* fallthrough */
 	case DEV_PROBED:
@@ -287,7 +288,7 @@ fs_dev_remove(struct sub_device *sdev)
 			ERROR("Bus detach failed for sub_device %u",
 			      SUB_ID(sdev));
 		} else {
-			rte_eth_dev_release_port(ETH(sdev));
+			rte_eth_dev_release_port(edev);
 		}
 		sdev->state = DEV_PARSED;
 		/* fallthrough */
diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
index 84e847f..1e2ad2d 100644
--- a/drivers/net/failsafe/failsafe_private.h
+++ b/drivers/net/failsafe/failsafe_private.h
@@ -100,13 +100,16 @@ 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; /* per process. */
+	struct rte_device *dev; /* per process. */
+	struct rte_eth_dev_data *data; /* shared between processes */
 	uint8_t sid;
 	/* Device state machine */
 	enum dev_state state;
@@ -139,7 +142,7 @@ 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 */
@@ -254,7 +257,7 @@ extern int failsafe_mac_from_arg;
 
 /* sdev: (struct sub_device *) */
 #define ETH(sdev) \
-	((sdev)->edev)
+	((sdev)->data == NULL ? NULL : &rte_eth_devices[(sdev)->data->port_id])
 
 /* sdev: (struct sub_device *) */
 #define PORT_ID(sdev) \
-- 
2.7.4