[dpdk-dev] [PATCH v3 5/5] net/iavf: fix max mtu size packets with vlan tag cannot be received by default

SteveX Yang stevex.yang at intel.com
Wed Sep 23 06:09:09 CEST 2020


testpmd will initialize default max packet length to 1518 which doesn't
include vlan tag size in ether overheader. Once, send the max mtu length
packet with vlan tag, the max packet length will exceed 1518 that will
cause packets dropped directly from NIC hw side.

iavf can support dual vlan tags that need more 8 bytes for max packet size,
so, configures the correct max packet size in dev_config ops.

Fixes: 02d212ca3125 ("net/iavf: rename remaining avf strings")

Signed-off-by: SteveX Yang <stevex.yang at intel.com>
---
 drivers/net/iavf/iavf_ethdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index 440da7d76..20581994c 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -226,6 +226,11 @@ iavf_dev_configure(struct rte_eth_dev *dev)
 	if (dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG)
 		dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_RSS_HASH;
 
+	/* Considering QinQ packet, max frame size should be MTU and
+	 * corresponding ether overhead.
+	 */
+	iavf_dev_mtu_set(dev, dev->data->mtu);
+
 	/* Vlan stripping setting */
 	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN) {
 		if (dev_conf->rxmode.offloads & DEV_RX_OFFLOAD_VLAN_STRIP)
-- 
2.17.1



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