From ea035187704c944ba115438681913ebfec6f00d5 Mon Sep 17 00:00:00 2001 From: Quentin Monnet Date: Wed, 7 Nov 2018 12:29:30 +0000 Subject: [PATCH] tools: bpftool: adjust rlimit RLIMIT_MEMLOCK when loading programs, maps The limit for memory locked in the kernel by a process is usually set to 64 kbytes by default. This can be an issue when creating large BPF maps and/or loading many programs. A workaround is to raise this limit for the current process before trying to create a new BPF map. Changing the hard limit requires the CAP_SYS_RESOURCE and can usually only be done by root user (for non-root users, a call to setrlimit fails (and sets errno) and the program simply goes on with its rlimit unchanged). There is no API to get the current amount of memory locked for a user, therefore we cannot raise the limit only when required. One solution, used by bcc, is to try to create the map, and on getting a EPERM error, raising the limit to infinity before giving another try. Another approach, used in iproute2, is to raise the limit in all cases, before trying to create the map. Here we do the same as in iproute2: the rlimit is raised to infinity before trying to load programs or to create maps with bpftool. Signed-off-by: Quentin Monnet Reviewed-by: Jakub Kicinski Acked-by: Martin KaFai Lau Signed-off-by: Daniel Borkmann --- tools/bpf/bpftool/common.c | 8 ++++++++ tools/bpf/bpftool/main.h | 2 ++ tools/bpf/bpftool/map.c | 2 ++ tools/bpf/bpftool/prog.c | 2 ++ 4 files changed, 14 insertions(+) diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index 25af85304ebee..1149565be4b16 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -46,6 +46,7 @@ #include #include #include +#include #include #include #include @@ -99,6 +100,13 @@ static bool is_bpffs(char *path) return (unsigned long)st_fs.f_type == BPF_FS_MAGIC; } +void set_max_rlimit(void) +{ + struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY }; + + setrlimit(RLIMIT_MEMLOCK, &rinf); +} + static int mnt_bpffs(const char *target, char *buff, size_t bufflen) { bool bind_done = false; diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index 28322ace28565..14857c273bf67 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -100,6 +100,8 @@ bool is_prefix(const char *pfx, const char *str); void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep); void usage(void) __noreturn; +void set_max_rlimit(void); + struct pinned_obj_table { DECLARE_HASHTABLE(table, 16); }; diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 7bf38f0e152e0..101b8a8812259 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -1140,6 +1140,8 @@ static int do_create(int argc, char **argv) return -1; } + set_max_rlimit(); + fd = bpf_create_map_xattr(&attr); if (fd < 0) { p_err("map create failed: %s", strerror(errno)); diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 5302ee282409e..b9b84553bec44 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -995,6 +995,8 @@ static int do_load(int argc, char **argv) goto err_close_obj; } + set_max_rlimit(); + err = bpf_object__load(obj); if (err) { p_err("failed to load object file"); -- 2.39.5