The network interface managed by the mlxbf_gige driver can
get into a problem state where traffic does not flow.
In this state, the interface will be up and enabled, but
will stop processing received packets. This problem state
will happen if three specific conditions occur:
1) driver has received more than (N * RxRingSize) packets but
less than (N+1 * RxRingSize) packets, where N is an odd number
Note: the command "ethtool -g <interface>" will display the
current receive ring size, which currently defaults to 128
2) the driver's interface was disabled via "ifconfig oob_net0 down"
during the window described in #1.
3) the driver's interface is re-enabled via "ifconfig oob_net0 up"
This patch ensures that the driver's "valid_polarity" field is
cleared during the open() method so that it always matches the
receive polarity used by hardware. Without this fix, the driver
needs to be unloaded and reloaded to correct this problem state.
Fixes: f92e1869d74e ("Add Mellanox BlueField Gigabit Ethernet driver")
Reviewed-by: Asmaa Mnebhi <email address hidden>
Signed-off-by: David Thompson <email address hidden>
Signed-off-by: David S. Miller <email address hidden>
(cherry picked from commit ee8a9600b5391f434905c46bec7f77d34505083e)
Signed-off-by: Asmaa Mnebhi <email address hidden>
Ready for review
for merging
into
~canonical-kernel/ubuntu/+source/linux-bluefield/+git/focal:master-next
