[dpdk-dev] [PATCH v2] app/testpmd: verify MTU with device provided limits

[Ferruh Yigit <ferruh.yigit@intel.com>]

From: Ian Stokes <ian.stokes@intel.com>

This commit uses the mtu fields populated in rte_eth_dev_info_get()
to validate the mtu value being passed in port_mtu_set().

Signed-off-by: Ian Stokes <ian.stokes@intel.com>
---
 app/test-pmd/config.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index b9e5dd923..cadcb512f 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1063,9 +1063,16 @@ void
 port_mtu_set(portid_t port_id, uint16_t mtu)
 {
 	int diag;
+	struct rte_eth_dev_info dev_info;
 
 	if (port_id_is_invalid(port_id, ENABLED_WARN))
 		return;
+	rte_eth_dev_info_get(port_id, &dev_info);
+	if (mtu > dev_info.max_mtu || mtu < dev_info.min_mtu) {
+		printf("Set MTU failed. MTU:%u is not in valid range, min:%u - max:%u\n",
+			mtu, dev_info.min_mtu, dev_info.max_mtu);
+		return;
+	}
 	diag = rte_eth_dev_set_mtu(port_id, mtu);
 	if (diag == 0)
 		return;
-- 
2.20.1