From c543f54698229b50078b72760b9e8a4731cffa03 Mon Sep 17 00:00:00 2001 From: Kevin Laatz Date: Tue, 27 Aug 2019 02:25:28 +0000 Subject: [PATCH] samples/bpf: add unaligned chunks mode support to xdpsock This patch adds support for the unaligned chunks mode. The addition of the unaligned chunks option will allow users to run the application with more relaxed chunk placement in the XDP umem. Unaligned chunks mode can be used with the '-u' or '--unaligned' command line options. Signed-off-by: Kevin Laatz Signed-off-by: Ciara Loftus Acked-by: Jonathan Lemon Signed-off-by: Daniel Borkmann --- samples/bpf/xdpsock_user.c | 20 +++++++++++++++++--- 1 file changed, 17 insertions(+), 3 deletions(-) diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c index da84c760c094..7312eab4d201 100644 --- a/samples/bpf/xdpsock_user.c +++ b/samples/bpf/xdpsock_user.c @@ -68,6 +68,9 @@ static int opt_queue; static int opt_poll; 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 u32 opt_xdp_bind_flags; static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE; static int opt_timeout = 1000; static bool opt_need_wakeup = true; @@ -284,7 +287,9 @@ static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size) .comp_size = XSK_RING_CONS__DEFAULT_NUM_DESCS, .frame_size = opt_xsk_frame_size, .frame_headroom = XSK_UMEM__DEFAULT_FRAME_HEADROOM, + .flags = opt_umem_flags }; + int ret; umem = calloc(1, sizeof(*umem)); @@ -293,6 +298,7 @@ static struct xsk_umem_info *xsk_configure_umem(void *buffer, u64 size) ret = xsk_umem__create(&umem->umem, buffer, size, &umem->fq, &umem->cq, &cfg); + if (ret) exit_with_error(-ret); @@ -355,6 +361,7 @@ static struct option long_options[] = { {"copy", no_argument, 0, 'c'}, {"frame-size", required_argument, 0, 'f'}, {"no-need-wakeup", no_argument, 0, 'm'}, + {"unaligned", no_argument, 0, 'u'}, {0, 0, 0, 0} }; @@ -376,6 +383,8 @@ static void usage(const char *prog) " -c, --copy Force copy mode.\n" " -f, --frame-size=n Set the frame size (must be a power of two, default is %d).\n" " -m, --no-need-wakeup Turn off use of driver need wakeup flag.\n" + " -f, --frame-size=n Set the frame size (must be a power of two in aligned mode, default is %d).\n" + " -u, --unaligned Enable unaligned chunk placement\n" "\n"; fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE); exit(EXIT_FAILURE); @@ -388,8 +397,7 @@ static void parse_command_line(int argc, char **argv) opterr = 0; for (;;) { - - c = getopt_long(argc, argv, "Frtli:q:psSNn:czf:m", + c = getopt_long(argc, argv, "Frtli:q:psSNn:czf:mu", long_options, &option_index); if (c == -1) break; @@ -429,6 +437,10 @@ static void parse_command_line(int argc, char **argv) case 'c': opt_xdp_bind_flags |= XDP_COPY; break; + case 'u': + opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG; + opt_unaligned_chunks = 1; + break; case 'F': opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; break; @@ -438,6 +450,7 @@ static void parse_command_line(int argc, char **argv) opt_need_wakeup = false; opt_xdp_bind_flags &= ~XDP_USE_NEED_WAKEUP; break; + default: usage(basename(argv[0])); } @@ -450,7 +463,8 @@ static void parse_command_line(int argc, char **argv) usage(basename(argv[0])); } - if (opt_xsk_frame_size & (opt_xsk_frame_size - 1)) { + if ((opt_xsk_frame_size & (opt_xsk_frame_size - 1)) && + !opt_unaligned_chunks) { fprintf(stderr, "--frame-size=%d is not a power of two\n", opt_xsk_frame_size); usage(basename(argv[0]));