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samples/bpf: Extend RLIMIT_MEMLOCK for xdp_{sample_pkts, router_ipv4} 

There is a common problem with xdp samples that happens when user wants
to run a particular sample and some bpf program is already loaded. The
default 64kb RLIMIT_MEMLOCK resource limit will cause a following error
(assuming that xdp sample that is failing was converted to libbpf
usage):

libbpf: Error in bpf_object__probe_name():Operation not permitted(1).
Couldn't load basic 'r0 = 0' BPF program.
libbpf: failed to load object './xdp_sample_pkts_kern.o'

Fix it in xdp_sample_pkts and xdp_router_ipv4 by setting RLIMIT_MEMLOCK
to RLIM_INFINITY.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Maciej Fijalkowski 2019-02-01 22:42:26 +01:00 committed by Daniel Borkmann
parent bbaf6029c4
commit 6a5457618f
2 changed files with 14 additions and 0 deletions
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7
samples/bpf/xdp_router_ipv4_user.c
View File

@ -25,6 +25,7 @@
#include <sys/syscall.h>
#include "bpf_util.h"
#include "bpf/libbpf.h"
#include <sys/resource.h>
int sock, sock_arp, flags = 0;
static int total_ifindex;
@ -609,6 +610,7 @@ cleanup:
int main(int ac, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct bpf_prog_load_attr prog_load_attr = {
.prog_type = BPF_PROG_TYPE_XDP,
};
@ -635,6 +637,11 @@ int main(int ac, char **argv)
ifname_list = (argv + 1);
}
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
perror("setrlimit(RLIMIT_MEMLOCK)");
return 1;
}
if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
return 1;

7
samples/bpf/xdp_sample_pkts_user.c
View File

@ -12,6 +12,7 @@
#include <signal.h>
#include <libbpf.h>
#include <bpf/bpf.h>
#include <sys/resource.h>
#include "perf-sys.h"
#include "trace_helpers.h"
@ -99,6 +100,7 @@ static void sig_handler(int signo)
int main(int argc, char **argv)
{
struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
struct bpf_prog_load_attr prog_load_attr = {
.prog_type = BPF_PROG_TYPE_XDP,
};
@ -114,6 +116,11 @@ int main(int argc, char **argv)
return 1;
}
if (setrlimit(RLIMIT_MEMLOCK, &r)) {
perror("setrlimit(RLIMIT_MEMLOCK)");
return 1;
}
numcpus = get_nprocs();
if (numcpus > MAX_CPUS)
numcpus = MAX_CPUS;