From 3945b37a975d22bed33b525f2933bac82424793d Mon Sep 17 00:00:00 2001 From: Kevin Laatz Date: Tue, 27 Aug 2019 02:25:30 +0000 Subject: 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 Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann --- samples/bpf/xdpsock_user.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) (limited to 'samples') 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); -- cgit v1.2.3-59-g8ed1b