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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>
This commit is contained in:
Kevin Laatz 2019-08-27 02:25:30 +00:00 committed by Daniel Borkmann
parent 03895e63ff
commit 3945b37a97
1 changed files with 10 additions and 5 deletions
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15
samples/bpf/xdpsock_user.c
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@ -70,6 +70,7 @@ static int opt_interval = 1;
static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP; static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
static u32 opt_umem_flags; static u32 opt_umem_flags;
static int opt_unaligned_chunks; static int opt_unaligned_chunks;
static int opt_mmap_flags;
static u32 opt_xdp_bind_flags; static u32 opt_xdp_bind_flags;
static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE; static int opt_xsk_frame_size = XSK_UMEM__DEFAULT_FRAME_SIZE;
static int opt_timeout = 1000; static int opt_timeout = 1000;
@ -440,6 +441,7 @@ static void parse_command_line(int argc, char **argv)
case 'u': case 'u':
opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG; opt_umem_flags |= XDP_UMEM_UNALIGNED_CHUNK_FLAG;
opt_unaligned_chunks = 1; opt_unaligned_chunks = 1;
opt_mmap_flags = MAP_HUGETLB;
break; break;
case 'F': case 'F':
opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; opt_xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
@ -742,11 +744,14 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
ret = posix_memalign(&bufs, getpagesize(), /* PAGE_SIZE aligned */ /* Reserve memory for the umem. Use hugepages if unaligned chunk mode */
NUM_FRAMES * opt_xsk_frame_size); bufs = mmap(NULL, NUM_FRAMES * opt_xsk_frame_size,
if (ret) PROT_READ | PROT_WRITE,
exit_with_error(ret); MAP_PRIVATE | MAP_ANONYMOUS | opt_mmap_flags, -1, 0);
if (bufs == MAP_FAILED) {
printf("ERROR: mmap failed\n");
exit(EXIT_FAILURE);
}
/* Create sockets... */ /* Create sockets... */
umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size); umem = xsk_configure_umem(bufs, NUM_FRAMES * opt_xsk_frame_size);
xsks[num_socks++] = xsk_configure_socket(umem); xsks[num_socks++] = xsk_configure_socket(umem);