linux>=6.10 Onload routing is broken in presence of TOS

[ol-alexandra]

Linux have slightly changed IP TOS management, see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=338bb57e4c2a1c2c6fc92f9c0bd35be7587adca7. As a result, Socket test --tester-run=sockapi-ts/sockopts/ip_tos:env=VAR.env.peer2peer,sock_type=tcp_passive,precedence_bits=FALSE,with_cmsg=FALSE fails on linux>=6.10 and on the latest Ubuntu kernels starting from linux-6.8.0-50. I also see issues with some custom applications.

I see 2 possible approaches:

• (easy) remove TOS policy routing support from Onload;
• (hard) fix it.

Please note that currently Onload perfectly routes by TOS even with new kernels; it breaks when TOS is somehow used, but there is no policy routing set.

If AMD Onload team agrees to remove TOS policy routing support, then I'm ready to provide a patch.