[dpdk-dev] [PATCH] ethdev: forbid MTU set before device configure

[Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>]

From: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>

rte_eth_dev_configure() always sets MTU to either dev_conf.rxmode.mtu
or RTE_ETHER_MTU if application doesn't provide the value.
So, there is no point to allow rte_eth_dev_set_mtu() before since
set value will be overwritten on configure anyway.

Fixes: 1bb4a528c41f ("ethdev: fix max Rx packet length")

Signed-off-by: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
---
 lib/ethdev/rte_ethdev.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index 4ea5a657e0..0d7dd68dc1 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -3728,6 +3728,13 @@ rte_eth_dev_set_mtu(uint16_t port_id, uint16_t mtu)
 			return ret;
 	}
 
+	if (dev->data->dev_configured == 0) {
+		RTE_ETHDEV_LOG(ERR,
+			"Port %u must be configured before MTU set\n",
+			port_id);
+		return -EINVAL;
+	}
+
 	ret = (*dev->dev_ops->mtu_set)(dev, mtu);
 	if (ret == 0)
 		dev->data->mtu = mtu;
-- 
2.30.2