[dpdk-dev] [PATCH v5 6/7] net/failsafe: use ownership mechanism to own ports

[Matan Azrad]

Fail-safe PMD sub devices management is based on ethdev port mechanism.
So, the sub-devices management structures are exposed to other DPDK
entities which may use them in parallel to fail-safe PMD.

Use the new port ownership mechanism to avoid multiple managments of
fail-safe PMD sub-devices.

Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Gaetan Rivet <gaetan.rivet at 6wind.com>
---
 drivers/net/failsafe/failsafe.c         |  7 +++++++
 drivers/net/failsafe/failsafe_eal.c     | 16 ++++++++++++++++
 drivers/net/failsafe/failsafe_private.h |  2 ++
 3 files changed, 25 insertions(+)

diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
index cb274eb..e05afbf 100644
--- a/drivers/net/failsafe/failsafe.c
+++ b/drivers/net/failsafe/failsafe.c
@@ -196,6 +196,13 @@
 	ret = failsafe_args_parse(dev, params);
 	if (ret)
 		goto free_subs;
+	ret = rte_eth_dev_owner_new(&priv->my_owner.id);
+	if (ret) {
+		ERROR("Failed to get unique owner identifier");
+		goto free_args;
+	}
+	snprintf(priv->my_owner.name, sizeof(priv->my_owner.name),
+		 FAILSAFE_OWNER_NAME);
 	ret = failsafe_eal_init(dev);
 	if (ret)
 		goto free_args;
diff --git a/drivers/net/failsafe/failsafe_eal.c b/drivers/net/failsafe/failsafe_eal.c
index 33a5adf..3994661 100644
--- a/drivers/net/failsafe/failsafe_eal.c
+++ b/drivers/net/failsafe/failsafe_eal.c
@@ -106,6 +106,22 @@
 			INFO("Taking control of a probed sub device"
 			      " %d named %s", i, da->name);
 		}
+		ret = rte_eth_dev_owner_set(pid, &PRIV(dev)->my_owner);
+		if (ret) {
+			INFO("sub_device %d owner set failed (%s),"
+			     " will try again later", i, strerror(ret));
+			continue;
+		} else if (strncmp(rte_eth_devices[pid].device->name, da->name,
+			   strlen(da->name)) != 0) {
+			/*
+			 * The device probably was removed and its port id was
+			 * reallocated before ownership set.
+			 */
+			rte_eth_dev_owner_unset(pid, PRIV(dev)->my_owner.id);
+			INFO("sub_device %d was probably removed before taking"
+			     " ownership, will try again later", i);
+			continue;
+		}
 		ETH(sdev) = &rte_eth_devices[pid];
 		SUB_ID(sdev) = i;
 		sdev->fs_dev = dev;
diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
index 7754248..ef0c9df 100644
--- a/drivers/net/failsafe/failsafe_private.h
+++ b/drivers/net/failsafe/failsafe_private.h
@@ -42,6 +42,7 @@
 #include <rte_devargs.h>
 
 #define FAILSAFE_DRIVER_NAME "Fail-safe PMD"
+#define FAILSAFE_OWNER_NAME "Fail-safe"
 
 #define PMD_FAILSAFE_MAC_KVARG "mac"
 #define PMD_FAILSAFE_HOTPLUG_POLL_KVARG "hotplug_poll"
@@ -145,6 +146,7 @@ struct fs_priv {
 	uint32_t mac_addr_pool[FAILSAFE_MAX_ETHADDR];
 	/* current capabilities */
 	struct rte_eth_dev_info infos;
+	struct rte_eth_dev_owner my_owner; /* Unique owner. */
 	/*
 	 * Fail-safe state machine.
 	 * This level will be tracking state of the EAL and eth
-- 
1.8.3.1