https://bugs.dpdk.org/show_bug.cgi?id=296
Bug ID: 296
Summary: max_rx_pkt_len issues with i40e dpdk SRIOV driver
net_i40e_vf.
Product: DPDK
Version: 18.02
Hardware: x86
OS: All
Status: CONFIRMED
Severity: major
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: lava...@gmail.com
CC: xiao.zh...@intel.com
Target Milestone: ---
CC: xiao.zh...@intel.com
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
instead 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 (xiao.zh...@intel.com) ---
Hi Lava,
I did not see the patch, can you upstream your patch to the community?
Thanks,
Xiao
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