linux-kernel - Re: [PATCH v2 2/2] selftests/net: replace ternary operator with min()/max()

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Date:   Thu, 24 Aug 2023 16:32:43 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Mahmoud Maatuq <mahmoudmatook.mm@...il.com>
Cc:     keescook@...omium.org, edumazet@...gle.com, wad@...omium.org,
        luto@...capital.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kuba@...nel.org, shuah@...nel.org,
        pabeni@...hat.com, linux-kselftest@...r.kernel.org,
        davem@...emloft.net, linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v2 2/2] selftests/net: replace ternary operator with min()/max()

On Thu, Aug 24, 2023 at 4:25 PM Mahmoud Maatuq
<mahmoudmatook.mm@...il.com> wrote:
>
> Fix the following coccicheck warning:
> tools/testing/selftests/net/udpgso_bench_tx.c:297:18-19: WARNING opportunity for min()
> tools/testing/selftests/net/udpgso_bench_tx.c:354:27-28: WARNING opportunity for min()
> tools/testing/selftests/net/so_txtime.c:129:24-26: WARNING opportunity for max()
> tools/testing/selftests/net/so_txtime.c:96:30-31: WARNING opportunity for max()
>
> Signed-off-by: Mahmoud Maatuq <mahmoudmatook.mm@...il.com>
> Suggested-by: Willem de Bruijn <willemdebruijn.kernel@...il.com>

I did not suggest this change.

> ---
> changes in v2:
> cast var cfg_mss to int to avoid static assertion
> after providing a stricter version of min() that does signedness checking.
> ---
>  tools/testing/selftests/net/Makefile          | 2 ++
>  tools/testing/selftests/net/so_txtime.c       | 7 ++++---
>  tools/testing/selftests/net/udpgso_bench_tx.c | 6 +++---
>  3 files changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index 7f3ab2a93ed6..a06cc25489f9 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -3,6 +3,8 @@
>
>  CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g
>  CFLAGS += -I../../../../usr/include/ $(KHDR_INCLUDES)
> +# Additional include paths needed by kselftest.h
> +CFLAGS += -I../

Why does kselftest.h need this? It does not include anything else?

I'd just add #include "../kselftests.h" to so_txtime.c and remove the
path change from udpgso_bench_tx.c

Fine with this approach. Just don't understand the comment

>
>  TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh \
>               rtnetlink.sh xfrm_policy.sh test_blackhole_dev.sh
> diff --git a/tools/testing/selftests/net/so_txtime.c b/tools/testing/selftests/net/so_txtime.c
> index 2672ac0b6d1f..2936174e7de4 100644
> --- a/tools/testing/selftests/net/so_txtime.c
> +++ b/tools/testing/selftests/net/so_txtime.c
> @@ -33,6 +33,8 @@
>  #include <unistd.h>
>  #include <poll.h>
>
> +#include "kselftest.h"
> +
>  static int     cfg_clockid     = CLOCK_TAI;
>  static uint16_t        cfg_port        = 8000;
>  static int     cfg_variance_us = 4000;
> @@ -93,8 +95,7 @@ static void do_send_one(int fdt, struct timed_send *ts)
>                 msg.msg_controllen = sizeof(control);
>
>                 tdeliver = glob_tstart + ts->delay_us * 1000;
> -               tdeliver_max = tdeliver_max > tdeliver ?
> -                              tdeliver_max : tdeliver;
> +               tdeliver_max = max(tdeliver_max, tdeliver);
>
>                 cm = CMSG_FIRSTHDR(&msg);
>                 cm->cmsg_level = SOL_SOCKET;
> @@ -126,7 +127,7 @@ static void do_recv_one(int fdr, struct timed_send *ts)
>                 error(1, 0, "read: %dB", ret);
>
>         tstop = (gettime_ns(cfg_clockid) - glob_tstart) / 1000;
> -       texpect = ts->delay_us >= 0 ? ts->delay_us : 0;
> +       texpect = max(ts->delay_us, 0);
>
>         fprintf(stderr, "payload:%c delay:%lld expected:%lld (us)\n",
>                         rbuf[0], (long long)tstop, (long long)texpect);
> diff --git a/tools/testing/selftests/net/udpgso_bench_tx.c b/tools/testing/selftests/net/udpgso_bench_tx.c
> index 477392715a9a..6bd32a312901 100644
> --- a/tools/testing/selftests/net/udpgso_bench_tx.c
> +++ b/tools/testing/selftests/net/udpgso_bench_tx.c
> @@ -25,7 +25,7 @@
>  #include <sys/types.h>
>  #include <unistd.h>
>
> -#include "../kselftest.h"
> +#include "kselftest.h"
>
>  #ifndef ETH_MAX_MTU
>  #define ETH_MAX_MTU 0xFFFFU
> @@ -294,7 +294,7 @@ static int send_udp(int fd, char *data)
>         total_len = cfg_payload_len;
>
>         while (total_len) {
> -               len = total_len < cfg_mss ? total_len : cfg_mss;
> +               len = min(total_len, (int)cfg_mss);
>
>                 ret = sendto(fd, data, len, cfg_zerocopy ? MSG_ZEROCOPY : 0,
>                              cfg_connected ? NULL : (void *)&cfg_dst_addr,
> @@ -351,7 +351,7 @@ static int send_udp_sendmmsg(int fd, char *data)
>                         error(1, 0, "sendmmsg: exceeds max_nr_msg");
>
>                 iov[i].iov_base = data + off;
> -               iov[i].iov_len = cfg_mss < left ? cfg_mss : left;
> +               iov[i].iov_len = min(cfg_mss, left);
>
>                 mmsgs[i].msg_hdr.msg_iov = iov + i;
>                 mmsgs[i].msg_hdr.msg_iovlen = 1;
> --
> 2.34.1
>