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Message-ID: References: <20261008031604.256498-1-kuniyu@google.com> <20261008031604.256498-6-kuniyu@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261008031604.256498-6-kuniyu@google.com> On 10/08, Kuniyuki Iwashima wrote: > BPF_CGROUP_RUN_PROG_XXX() macros guard __cgroup_bpf_run_filter_XXX() > with cgroup_bpf_enabled(). > > However, even when no SOCK_OPS prog is attached, callers still > initialise struct bpf_sock_ops_kern (memset(), etc.) or evaluate > BPF_SOCK_OPS_TEST_FLAG(), which loads tp->bpf_sock_ops_cb_flags > from a cold cacheline near the end of struct tcp_sock. > > Similar to bpf_tcp_ops, let's check cgroup_bpf_enabled() before > BPF_SOCK_OPS_TEST_FLAG() and struct bpf_sock_ops_kern setup, and > rename BPF_CGROUP_RUN_PROG_SOCK_OPS{,_SK}() with __ prefix. > > Since all direct callers of tcp_call_bpf() pass 0 and NULL for > nargs and args, they can be folded into the new tcp_call_bpf() > macro. > > All callers of tcp_call_bpf_{2,3}arg() check BPF_SOCK_OPS_TEST_FLAG() > and do not need the return value. These are replaced with the new > tcp_call_bpf_flag() macro. > > Now, bpf_skops_hdr_opt_len() and bpf_tcp_ops_hdr_opt_len() are > just NOPs without bpf prog attached. > > $ llvm-objdump -S -D --disassemble=tcp_established_options vmlinux > ... > ; asm goto(ARCH_STATIC_BRANCH_ASM("%c0 + %c1", "%l[l_yes]") > >>ffffffff825127e6: 66 90 nop > >>ffffffff825127e8: 66 90 nop > ; size = MAX_TCP_OPTION_SPACE - remaining; > ffffffff825127ea: b9 28 00 00 00 movl $0x28, %ecx > ffffffff825127ef: 29 c1 subl %eax, %ecx > ; return size; > ffffffff825127f1: 89 c8 movl %ecx, %eax > ... > ffffffff825127fb: 2e e9 6f 02 43 00 jmp 0xffffffff82942a70 <__x86_return_thunk> > > Signed-off-by: Kuniyuki Iwashima > --- > v5: Always inline static key to tcp_established_options() Acked-by: Stanislav Fomichev