[dpdk-dev] [PATCH v4 2/7] ethdev: fix used portid allocation

[Matan Azrad]

rte_eth_dev_find_free_port() found a free port by state checking.
The state field are in local process memory, so other DPDK processes
may get the same port ID because their local states may be different.

Replace the state checking by the ethdev port name checking,
so, if the name is an empty string the port ID will be detected as
unused.

Fixes: d948f596fee2 ("ethdev: fix port data mismatched in multiple process model")
Cc: stable at dpdk.org

Suggested-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Thomas Monjalon <thomas at monjalon.net>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---
 lib/librte_ether/rte_ethdev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 23b7442..3a25a64 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -164,8 +164,12 @@ struct rte_eth_dev *
 	unsigned i;
 
 	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
-		if (rte_eth_devices[i].state == RTE_ETH_DEV_UNUSED)
+		/* Using shared name field to find a free port. */
+		if (rte_eth_dev_data[i].name[0] == '\0') {
+			RTE_ASSERT(rte_eth_devices[i].state ==
+				   RTE_ETH_DEV_UNUSED);
 			return i;
+		}
 	}
 	return RTE_MAX_ETHPORTS;
 }
-- 
1.8.3.1