Re: [PATCH net-next v2] selftests: drv-net: add BIG TCP test cases

On Fri, 11 Sep 2026 22:03:27 -0700 Narcisa Vasile wrote:

Add four new test cases that validate coalescing
under increased size limits (BIG TCP):

big_tcp_data_same
  - validates that equal-sized segments coalesce past
   the legacy IP_MAXPACKET limit.
big_tcp_data_lrg_sml
  - validates that a smaller final segment coalesces into the
    previous chain of large-sized segments while crossing the
    IP_MAXPACKET limit.
big_tcp_tcp_seq
  - validates that a packet with a wrong sequence number doesn't
    coalesce. The test uses a sequence number for which the low 16 bits
    correspond to the correct sequence number to validate against
    truncation bugs, since total aggregate length crosses over the
    legacy size limit for BIG TCP.
big_tcp_large_max
  - validates that coalescing stops at the configured BIG TCP limit.

 
Still failing:

https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-drv-dbg/results/819882/3-gro-sw-py/stdout

https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-drv-dbg/results/819882/3-gro-sw-py-retry/stdout

Grep gro_lib.py for KSFT_MACHINE_SLOW
Then the 15x increase is probably unnecessary/too high as well, since
we GRO 64k 128k shouldn't need more than 2x ?