Re: [PATCH bpf-next v4 06/14] selftests/bpf: Use connect_to_addr in sk_assign

[Martin KaFai Lau <martin.lau@linux.dev>]

On 4/16/24 3:13 AM, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> This patch uses public helper connect_to_addr() exported in
> network_helpers.h instead of the local defined function connect_to_server()
> in prog_tests/sk_assign.c. This can avoid duplicate code.
> 
> The code that sets SO_SNDTIMEO timeout as timeo_sec (3s) can be dropped,
> since connect_to_addr() sets default timeout as 3s.
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---
>   .../selftests/bpf/prog_tests/sk_assign.c      | 26 +------------------
>   1 file changed, 1 insertion(+), 25 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/sk_assign.c b/tools/testing/selftests/bpf/prog_tests/sk_assign.c
> index fa8f757c0edd..766fc56f5fc7 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sk_assign.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sk_assign.c
> @@ -23,8 +23,6 @@
>   #define NS_SELF "/proc/self/ns/net"
>   #define SERVER_MAP_PATH "/sys/fs/bpf/tc/globals/server_map"
>   
> -static const struct timeval timeo_sec = { .tv_sec = 3 };
> -static const size_t timeo_optlen = sizeof(timeo_sec);
>   static int stop, duration;
>   
>   static bool
> @@ -74,28 +72,6 @@ configure_stack(void)
>   	return true;
>   }
>   
> -static int
> -connect_to_server(const struct sockaddr *addr, socklen_t len, int type)
> -{
> -	int fd = -1;
> -
> -	fd = socket(addr->sa_family, type, 0);
> -	if (CHECK_FAIL(fd == -1))
> -		goto out;
> -	if (CHECK_FAIL(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo_sec,
> -				  timeo_optlen)))

I think Eduard has also pointed out in v2 that the existing connect_to_addr() 
does not set the timeout and suggested to add the opts arg also.

One option is to just modify the connect_to_addr() to set the default timeout 
(3s) without needing to add the opts arg. Since we are changing the signature of 
connect_to_addr() anyway, lets just add the opts argument also. When opts is 
NULL or opts->timeout_ms is 0, then use the default 3s timeout like other 
helpers do.

something like,

int connect_to_addr(int type, const struct sockaddr_storage *addr,
		    socklen_t addrlen, const struct network_helper_opts *opts);