ethdev: report error on ring name truncation

Currently this api doesn't report error if name is
truncated and so user is not sure about uniqueness
of name. This change reports error to help user.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 9d5107d..0d192a2 100644 (file)
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -3588,9 +3588,15 @@ rte_eth_dma_zone_reserve(const struct rte_eth_dev *dev, const char *ring_name,
 {
        char z_name[RTE_MEMZONE_NAMESIZE];
        const struct rte_memzone *mz;
+       int rc;
 
-       snprintf(z_name, sizeof(z_name), "eth_p%d_q%d_%s",
-                dev->data->port_id, queue_id, ring_name);
+       rc = snprintf(z_name, sizeof(z_name), "eth_p%d_q%d_%s",
+                     dev->data->port_id, queue_id, ring_name);
+       if (rc >= RTE_MEMZONE_NAMESIZE) {
+               RTE_ETHDEV_LOG(ERR, "ring name too long\n");
+               rte_errno = ENAMETOOLONG;
+               return NULL;
+       }
 
        mz = rte_memzone_lookup(z_name);
        if (mz)