https://bugs.dpdk.org/show_bug.cgi?id=294
Bug ID: 294
Summary: max_rx_pkt_len issues with i40e dpdk SRIOV driver
(net_i40e_vf).
Product: DPDK
Version: 18.02
Hardware: x86
OS: All
Status: RESOLVED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
CC: [email protected]
Status: RESOLVED
Resolution: DUPLICATE
max_rx_pkt_len issues with i40e dpdk SRIOV driver (net_i40e_vf).
================================================================
When deployed an SRIOV setup with Intel® Ethernet 700 Series 40GB NIC, we
noticed the traffic with default mtu (1500) is not working.
The maximum MSS which was worked is 1456 ( instead of the default value 1460).
On debugging, it is found that the driver is actually setting the
dev_data->dev_conf.rxmode.max_rx_pkt_len to 1518(ETHER_MAX_LEN) which is wrong.
The max len is not including the vlan tag len( also not including QinQ).
The ETH Overhead is defined as below
#define I40E_ETH_OVERHEAD \
(ETHER_HDR_LEN + ETHER_CRC_LEN + I40E_VLAN_TAG_SIZE * 2) which is
equal to 26
so for supporting an MTU size of 1500, the max_rx_pkt_len should be 1526 intead
of 1518.
The i40evf_dev_mtu_set API also wrongly checking the framesize against
ETHER_MAX_LEN(1518) to set the jumbo_frame mode.
The attached patch resolved the issue for our testing.
Please verify and fix the issue.
Thanks and Regards,
Lava
--- Comment #1 from Xiao Zhang ([email protected]) ---
duplicate of 296
*** This bug has been marked as a duplicate of bug 296 ***
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