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util: Define small and big thresholds for socket buffers as unsigned long long

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On 32-bit architectures, clang-tidy reports:

/home/pi/passt/tcp.c:728:11: error: performing an implicit widening conversion to type 'uint64_t' (aka 'unsigned long long') of a multiplication performed in type 'unsigned long' [bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
  728 |         if (v >= SNDBUF_BIG)
      |                  ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
  158 | #define SNDBUF_BIG              (4UL * 1024 * 1024)
      |                                  ^
/home/pi/passt/tcp.c:728:11: note: make conversion explicit to silence this warning
  728 |         if (v >= SNDBUF_BIG)
      |                  ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
  158 | #define SNDBUF_BIG              (4UL * 1024 * 1024)
      |                                  ^~~~~~~~~~~~~~~~~
/home/pi/passt/tcp.c:728:11: note: perform multiplication in a wider type
  728 |         if (v >= SNDBUF_BIG)
      |                  ^
/home/pi/passt/util.h:158:22: note: expanded from macro 'SNDBUF_BIG'
  158 | #define SNDBUF_BIG              (4UL * 1024 * 1024)
      |                                  ^~~~~~~~~~
/home/pi/passt/tcp.c:730:15: error: performing an implicit widening conversion to type 'uint64_t' (aka 'unsigned long long') of a multiplication performed in type 'unsigned long' [bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
  730 |         else if (v > SNDBUF_SMALL)
      |                      ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^
/home/pi/passt/tcp.c:730:15: note: make conversion explicit to silence this warning
  730 |         else if (v > SNDBUF_SMALL)
      |                      ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^~~~~~~~~~~~
/home/pi/passt/tcp.c:730:15: note: perform multiplication in a wider type
  730 |         else if (v > SNDBUF_SMALL)
      |                      ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^~~~~
/home/pi/passt/tcp.c:731:17: error: performing an implicit widening conversion to type 'uint64_t' (aka 'unsigned long long') of a multiplication performed in type 'unsigned long' [bugprone-implicit-widening-of-multiplication-result,-warnings-as-errors]
  731 |                 v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
      |                               ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^
/home/pi/passt/tcp.c:731:17: note: make conversion explicit to silence this warning
  731 |                 v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
      |                               ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^~~~~~~~~~~~
/home/pi/passt/tcp.c:731:17: note: perform multiplication in a wider type
  731 |                 v -= v * (v - SNDBUF_SMALL) / (SNDBUF_BIG - SNDBUF_SMALL) / 2;
      |                               ^
/home/pi/passt/util.h:159:24: note: expanded from macro 'SNDBUF_SMALL'
  159 | #define SNDBUF_SMALL            (128UL * 1024)
      |                                  ^~~~~

because, wherever we use those thresholds, we define the other term
of comparison as uint64_t. Define the thresholds as unsigned long long
as well, to make sure we match types.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2024-11-07 19:04:44 +01:00
commit d4f09c9b96
1 changed files with 3 additions and 3 deletions

6
util.h
View file

@ -158,9 +158,9 @@ int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
(void *)(arg)); \
} while (0)
#define RCVBUF_BIG (2UL * 1024 * 1024)
#define SNDBUF_BIG (4UL * 1024 * 1024)
#define SNDBUF_SMALL (128UL * 1024)
#define RCVBUF_BIG (2ULL * 1024 * 1024)
#define SNDBUF_BIG (4ULL * 1024 * 1024)
#define SNDBUF_SMALL (128ULL * 1024)
#include <net/if.h>
#include <limits.h>