[PATCH v3 1/6] ethdev: check that device supports deferred start

[Stephen Hemminger <stephen@networkplumber.org>]

The check for supporting deferred start should be handled at
the ethdev level for all devices.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
---
 lib/ethdev/rte_ethdev.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 6413c54e3b..7678fa47b6 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -2264,6 +2264,14 @@ rte_eth_rx_queue_setup(uint16_t port_id, uint16_t rx_queue_id,
 	if (rx_conf != NULL)
 		rx_offloads |= rx_conf->offloads;
 
+	/* Deferred start requires that device supports queue start */
+	if (rx_conf != NULL && rx_conf->rx_deferred_start &&
+	    *dev->dev_ops->rx_queue_start == NULL) {
+		RTE_ETHDEV_LOG_LINE(ERR,
+			    "Deferred start requested, but driver does not support queue start");
+		return -ENOTSUP;
+	}
+
 	/* Ensure that we have one and only one source of Rx buffers */
 	if ((mp != NULL) +
 	    (rx_conf != NULL && rx_conf->rx_nseg > 0) +
@@ -2575,6 +2583,14 @@ rte_eth_tx_queue_setup(uint16_t port_id, uint16_t tx_queue_id,
 		return -EINVAL;
 	}
 
+	/* Deferred start requires that device supports queue start */
+	if (tx_conf != NULL && tx_conf->tx_deferred_start &&
+	    *dev->dev_ops->tx_queue_start == NULL) {
+		RTE_ETHDEV_LOG_LINE(ERR,
+			    "Deferred start requested, but driver does not support queue start");
+		return -ENOTSUP;
+	}
+
 	ret = rte_eth_dev_info_get(port_id, &dev_info);
 	if (ret != 0)
 		return ret;
-- 
2.45.2