[dpdk-dev] Intel X710, DPDK with SFP - FTLX8574D3BCV-IT link down

[amit shukla <amitshukla19@gmail.com>]

Hello,

Using a X710 based NIC with Intel SFP - FTLX8574D3BCV-IT on a bare-metal
setup, I came across the following issue on the i40e PMD:

When Intel SFP - FTLX8574D3BCV-IT is used, link does not come up on
executing link down and up commands in quick succession. It shows
"NO-CARRIER" in ip link show.

#ip link set dev eth0 down; ip link set dev eth0 up
#
# ip link show dev eth0
304: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN mode DEFAULT group default qlen 1000
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff

On the 1st command, ip link set dev eth0 down, i40e_aq_get_phy_capabilities
returns success but for next command (ip link set dev eth0 up) it returns
I40E_ERR_UNKNOWN_PHY (-7).

If  link down and up commands are executed with a sleep of 1 second
in-between them, then issue is not observed.

Intel(R) Xeon(R) CPU E5-2637 v3 @ 3.50GHz
DPDK - 17.05
NIC firmware-version: 4.53 0x80001e5b 17.0.12
05:00.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for
10GbE SFP+ (rev 02)
        Subsystem: Intel Corporation Ethernet 10G 2P X710 Adapter

Thanks and Regards,
Amit Shukla