ethdev: add a missing sanity check for Tx queue setup

Add a sanity check for number of tx descriptors requested during tx
queue setup.  Return -EINVAL if the number requested does not meet
the tx descriptor requirements of the device.

Fixes: 80a1deb4c77a ("ethdev: add API to retrieve queue information")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index b19ac9a817262bf0c58b7c1d94f425747ad12c71..dfd6c0b49f164bc1ff4cc6cfa5c26a5b535a8ab2 100644 (file)
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1342,6 +1342,18 @@ rte_eth_tx_queue_setup(uint8_t port_id, uint16_t tx_queue_id,
 
        rte_eth_dev_info_get(port_id, &dev_info);
 
+       if (nb_tx_desc > dev_info.tx_desc_lim.nb_max ||
+           nb_tx_desc < dev_info.tx_desc_lim.nb_min ||
+           nb_tx_desc % dev_info.tx_desc_lim.nb_align != 0) {
+               PMD_DEBUG_TRACE("Invalid value for nb_tx_desc(=%hu), "
+                               "should be: <= %hu, = %hu, and a product of %hu\n",
+                               nb_tx_desc,
+                               dev_info.tx_desc_lim.nb_max,
+                               dev_info.tx_desc_lim.nb_min,
+                               dev_info.tx_desc_lim.nb_align);
+               return -EINVAL;
+       }
+
        if (tx_conf == NULL)
                tx_conf = &dev_info.default_txconf;