diff mbox series

[v4,1/5] net/e1000: fix max mtu size packets with vlan tag cannot be received by default

Message ID 20200928065541.7520-2-stevex.yang@intel.com (mailing list archive)
State Changes Requested, archived
Delegated to: Qi Zhang
Headers show
Series fix default max mtu size when device configured | expand


Context Check Description
ci/checkpatch success coding style OK

Commit Message

Steve Yang Sept. 28, 2020, 6:55 a.m. UTC
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.

e1000 can support single vlan tags that need more 4 bytes for max packet
size, so, configures the correct max packet size in dev_config ops.

Fixes: 35b2d13fd6fd ("net: add rte prefix to ether defines")

Signed-off-by: SteveX Yang <stevex.yang@intel.com>
 drivers/net/e1000/em_ethdev.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series


diff --git a/drivers/net/e1000/em_ethdev.c b/drivers/net/e1000/em_ethdev.c
index 1dc360713..96ff99951 100644
--- a/drivers/net/e1000/em_ethdev.c
+++ b/drivers/net/e1000/em_ethdev.c
@@ -437,10 +437,22 @@  eth_em_configure(struct rte_eth_dev *dev)
 	struct e1000_interrupt *intr =
+	uint16_t frame_size = dev->data->mtu + E1000_ETH_OVERHEAD;
+	int rc = 0;
 	intr->flags |= E1000_FLAG_NEED_LINK_UPDATE;
+	/**
+	 * Considering vlan tag packet, max frame size should be equal or
+	 * larger than total size of MTU and Ether overhead.
+	 */
+	if (frame_size > dev->data->dev_conf.rxmode.max_rx_pkt_len) {
+		rc = eth_em_mtu_set(dev, dev->data->mtu);
+		if (rc != 0)
+			return rc;
+	}
 	return 0;