Sorry for the stupid question, but is the attached interface (eth8 or eth9) set to UP when these captures were taken?
The Linux SFP code will not ‘activate’ the SFP (driving TX_DISABLE), or the host side even, until the corresponding interface has been brought up.
Here is an example:
$ cat /sys/kernel/debug/dpmac2_sfp/state
Module state: present
Module probe attempts: 0 0
Device state: down
Main state: down
Fault recovery remaining retries: 0
PHY probe remaining retries: 0
moddef0: 1
rx_los: 0
tx_fault: 0
tx_disable: 1
$ ifconfig eth8 up
[ 39.032017] fsl_dpaa2_eth dpni.1 eth8: configuring for inband/10gbase-r link mode
[ 39.108046] fsl_dpaa2_eth dpni.1 eth8: Link is Up - 10Gbps/Full - flow control off
[ 39.115687] IPv6: ADDRCONF(NETDEV_CHANGE): eth8: link becomes ready
$ cat /sys/kernel/debug/dpmac2_sfp/state
Module state: present
Module probe attempts: 0 0
Device state: up
Main state: link_up
Fault recovery remaining retries: 5
PHY probe remaining retries: 12
moddef0: 1
rx_los: 0
tx_fault: 0
tx_disable: 0
A DAC is a good sanity check, as that is just a simple electrical connection (which also ignores the control/state signals from the host).