bpftool: Probe for ISA v4 instruction set extension #4761
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This patch introduces a new probe to check whether the kernel supports
instruction set extensions v4. The v4 extension comprises several new
instructions: BPF_{SDIV,SMOD} (signed div and mod), BPF_{LD,LDX,ST,STX,MOV}
(sign-extended load/store/move), 32-bit BPF_JA (unconditional jump),
target-independent BPF_ALU64 BSWAP (byte-swapping 16/32/64). These have
been introduced in the following commits respectively:
* ec0e2da ("bpf: Support new signed div/mod instructions.")
* 1f9a1ea ("bpf: Support new sign-extension load insns")
* 8100928 ("bpf: Support new sign-extension mov insns")
* 4cd58e9 ("bpf: Support new 32bit offset jmp instruction")
* 0845c3d ("bpf: Support new unconditional bswap instruction")
Support in bpftool for previous ISA extensions were added in commit
0fd800b ("bpftool: Probe for instruction set extensions"). These probes
are useful for userspace BPF projects that want to use newer
instruction set extensions on newer kernels, to reduce the programs'
sizes or their complexity. LLVM provides the mcpu=v4 option since commit
"[BPF] support for BPF_ST instruction in codegen"
(llvm/llvm-project@8f28e80).
Changelog:
- v2:
- moved BPF_JMP32_A macro after BPF_JMP_A in filter.h for consistency
with include/linux/filter.h, noted by Quentin Monnet <[email protected]>
Signed-off-by: Simone Magnani <[email protected]>
Reviewed-by: Quentin Monnet <[email protected]>
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Pull request for series with
subject: bpftool: Probe for ISA v4 instruction set extension
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=915866