On 7 Nov 2019, at 14:27, Ciara Loftus wrote:
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;
Why is this limited to 1500 in the AF_XDP PMD? For native AF_XDP in OVS
the limit is mainly by the driver/XDP page limit:
min(PAGE_SIZE, ETH_AF_XDP_FRAME_SIZE ) - ETH_XDP_DATA_HEADROOM -
XDP_PACKET_HEADROOM
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
