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authorKevin Laatz <kevin.laatz@intel.com>2019-08-27 02:25:30 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2019-08-31 01:08:27 +0200
commit3945b37a975d22bed33b525f2933bac82424793d (patch)
tree96d0f8a9bd273899be911c3c6a2e41fa72eb8ff2 /samples/bpf
parent03895e63ff97447e5eab1b71ed46e3662a45bfe8 (diff)
downloadlinux-3945b37a975d22bed33b525f2933bac82424793d.tar.bz2
samples/bpf: use hugepages in xdpsock app
This patch modifies xdpsock to use mmap instead of posix_memalign. With this change, we can use hugepages when running the application in unaligned chunks mode. Using hugepages makes it more likely that we have physically contiguous memory, which supports the unaligned chunk mode better. Signed-off-by: Kevin Laatz <kevin.laatz@intel.com> Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/xdpsock_user.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index dc3d50f8ed86..102eace22956 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -70,6 +70,7 @@ static int opt_interval = 1;
static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
static u32 opt_umem_flags;
static int opt_unaligned_chunks;
+static int opt_mmap_flags;
static u32 opt_xdp_bind_flags;
static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
static int opt_timeout = 1000;
@@ -440,6 +441,7 @@ static void parse_command_line(int argc, char **argv)
case 'u':
opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG;
opt_unaligned_chunks = 1;
+ opt_mmap_flags = MAP_HUGETLB;
break;
case 'F':
opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
@@ -742,11 +744,14 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
- ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */
- NUM_FRAMES * opt_xsk_frame_size);
- if (ret)
- exit_with_error(ret);
-
+ /* Reserve memory for the umem. Use hugepages if unaligned chunk mode */
+ bufs = mmap(NULL, NUM_FRAMES * opt_xsk_frame_size,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | opt_mmap_flags, -1, 0);
+ if (bufs == MAP_FAILED) {
+ printf("ERROR: mmap failed\n");
+ exit(EXIT_FAILURE);
+ }
/* Create sockets... */
umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size);
xsks[num_socks++] = xsk_configure_socket(umem);