[LTP] [PATCH 0/2] pty: use correct protocol in pty04 based on line discipline

[Petr Vorel]

Hi Vasileios,

> Hi,

> during testing of the LTP pty test pty04, we observed intermittent
> failures caused by unexpected IPv6 packets being received.

> The test currently filters packets using ETH_P_ALL. As a result,
> packets with protocols other than the expected one (e.g. IPv6) may be
> received, leading to data corruption reports such as:

> TFAIL: Corrupt data (max 64 of 8191 bytes shown): data[0..64] =
> TFAIL: 60 00 00 00 00 24 00 01 00 00 00 00 00 00 00 00
> TFAIL: 00 00 00 00 00 00 00 00 ff 02 00 00 00 00 00 00
> TFAIL: 00 00 00 00 00 00 00 16 3a 00 05 02 00 00 01 00
> TFAIL: 8f 00 6e 8a 00 00 00 01 04 00 00 00 ff 02 00 00

nit: IMHO useful info, it'd be nice to have it in the commit itself (otherwise
it will be lost). But no need to repost.

Kind regards,
Petr

> This patch series addresses the issue by selecting the protocol based
> on the configured line discipline.

> Patch 1 adds a compatibility definition for ETH_P_CAN to the LAPI
> headers. Patch 2 updates pty04 to choose the appropriate protocol,
> avoiding reception of unrelated packets.

> Signed-off-by: Vasileios Almpanis <vasileios.almpanis@virtuozzo.com>

> Vasileios Almpanis (2):
>   add ETH_P_CAN compat macro to LAPI headers
>   pty04: use the correct protocol per line discipline to avoid extra
>     packets

>  include/lapi/if_ether.h      |  4 ++++
>  testcases/kernel/pty/pty04.c | 15 ++++++++++++++-
>  2 files changed, 18 insertions(+), 1 deletion(-)