Since commit f5769faeec36 ("net: Namespace-ify sysctl_optmem_max") optmem_max is per-netns, so need of switching to root namespace. It seems trivial to keep the old logic working, so going to keep it for a while (at least, until kernel with netns-optmem_max will be release).
Currently, there is a test that checks that optmem_max limit applies to TCP-AO keys and a little benchmark that measures linked-list TCP-AO keys scaling, those are fixed by this.
Cc: Eric Dumazet edumazet@google.com Signed-off-by: Dmitry Safonov dima@arista.com --- tools/testing/selftests/net/tcp_ao/lib/setup.c | 35 ++++++++++++++++++++------ 1 file changed, 27 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/net/tcp_ao/lib/setup.c b/tools/testing/selftests/net/tcp_ao/lib/setup.c index 374b27c26ebd..92276f916f2f 100644 --- a/tools/testing/selftests/net/tcp_ao/lib/setup.c +++ b/tools/testing/selftests/net/tcp_ao/lib/setup.c @@ -277,22 +277,38 @@ void __test_init(unsigned int ntests, int family, unsigned int prefix,
/* /proc/sys/net/core/optmem_max artifically limits the amount of memory * that can be allocated with sock_kmalloc() on each socket in the system. - * It is not virtualized, so it has to written outside test namespaces. - * To be nice a test will revert optmem back to the old value. + * It is not virtualized in v6.7, so it has to written outside test + * namespaces. To be nice a test will revert optmem back to the old value. * Keeping it simple without any file lock, which means the tests that * need to set/increase optmem value shouldn't run in parallel. * Also, not re-entrant. + * Since commit f5769faeec36 ("net: Namespace-ify sysctl_optmem_max") + * it is per-namespace, keeping logic for non-virtualized optmem_max + * for v6.7, which supports TCP-AO. */ static const char *optmem_file = "/proc/sys/net/core/optmem_max"; static size_t saved_optmem; +static int optmem_ns = -1; + +static bool is_optmem_namespaced(void) +{ + if (optmem_ns == -1) { + int old_ns = switch_save_ns(nsfd_child); + + optmem_ns = !access(optmem_file, F_OK); + switch_ns(old_ns); + } + return !!optmem_ns; +}
size_t test_get_optmem(void) { + int old_ns = 0; FILE *foptmem; - int old_ns; size_t ret;
- old_ns = switch_save_ns(nsfd_outside); + if (!is_optmem_namespaced()) + old_ns = switch_save_ns(nsfd_outside); foptmem = fopen(optmem_file, "r"); if (!foptmem) test_error("failed to open %s", optmem_file); @@ -300,19 +316,21 @@ size_t test_get_optmem(void) if (fscanf(foptmem, "%zu", &ret) != 1) test_error("can't read from %s", optmem_file); fclose(foptmem); - switch_ns(old_ns); + if (!is_optmem_namespaced()) + switch_ns(old_ns); return ret; }
static void __test_set_optmem(size_t new, size_t *old) { + int old_ns = 0; FILE *foptmem; - int old_ns;
if (old != NULL) *old = test_get_optmem();
- old_ns = switch_save_ns(nsfd_outside); + if (!is_optmem_namespaced()) + old_ns = switch_save_ns(nsfd_outside); foptmem = fopen(optmem_file, "w"); if (!foptmem) test_error("failed to open %s", optmem_file); @@ -320,7 +338,8 @@ static void __test_set_optmem(size_t new, size_t *old) if (fprintf(foptmem, "%zu", new) <= 0) test_error("can't write %zu to %s", new, optmem_file); fclose(foptmem); - switch_ns(old_ns); + if (!is_optmem_namespaced()) + switch_ns(old_ns); }
static void test_revert_optmem(void)