[dpdk-dev] [PATCH] net/af_xdp: enforce an MTU of 1500

[Ciara Loftus]

Packets larger than this will fail to be transmitted by AF_XDP,
so limit the MTU to 1500.

Signed-off-by: Ciara Loftus <ciara.lof...@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c 
b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 2b1245ee4..62c801500 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -595,7 +595,7 @@ eth_dev_info(struct rte_eth_dev *dev, struct 
rte_eth_dev_info *dev_info)
        dev_info->max_tx_queues = internals->queue_cnt;
 
        dev_info->min_mtu = RTE_ETHER_MIN_MTU;
-       dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM;
+       dev_info->max_mtu = 1500;
 
        dev_info->default_rxportconf.nb_queues = 1;
        dev_info->default_txportconf.nb_queues = 1;
@@ -1328,6 +1328,8 @@ rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
                return -1;
        }
 
+       eth_dev_mtu_set(eth_dev, 1500);
+
        rte_eth_dev_probing_finish(eth_dev);
 
        return 0;
-- 
2.17.1