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

Ciara Loftus ciara.loftus at intel.com
Thu Nov 7 14:27:10 CET 2019


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

Signed-off-by: Ciara Loftus <ciara.loftus at 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



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