[PATCH bpf-next 0/2] Add 12-argument support for RV64 bpf trampoline

[Pu Lehui]

This patch adds 12 function arguments support for riscv64 bpf
trampoline. The current bpf trampoline supports <= sizeof(u64) bytes
scalar arguments [0] and <= 16 bytes struct arguments [1]. Therefore, we
focus on the situation where scalars are at most XLEN bits and
aggregates whose total size does not exceed 2×XLEN bits in the riscv
calling convention [2].

Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6184 [0]
Link: https://elixir.bootlin.com/linux/v6.8/source/kernel/bpf/btf.c#L6769 [1]
Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/download/draft-20230929-e5c800e661a53efe3c2678d71a306323b60eb13b/riscv-abi.pdf [2]

Pu Lehui (2):
  riscv, bpf: Add 12-argument support for RV64 bpf trampoline
  selftests/bpf: Add testcase where 7th argment is struct

 arch/riscv/net/bpf_jit_comp64.c               | 63 +++++++++++++------
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   | 19 ++++++
 .../selftests/bpf/prog_tests/tracing_struct.c | 13 ++++
 .../selftests/bpf/progs/tracing_struct.c      | 35 +++++++++++
 4 files changed, 111 insertions(+), 19 deletions(-)

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2.34.1