On 1/22/21 11:53 AM, Björn Töpel wrote:
From: Björn Töpel <bjorn.topel@xxxxxxxxx>
Add detection for kernel version, and adapt the BPF program based on
kernel support. This way, users will get the best possible performance
from the BPF program.
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Signed-off-by: Björn Töpel <bjorn.topel@xxxxxxxxx>
Signed-off-by: Marek Majtyka <alardam@xxxxxxxxx>
---
tools/lib/bpf/xsk.c | 82 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 79 insertions(+), 3 deletions(-)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index e3e41ceeb1bc..1df8c133a5bc 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -46,6 +46,11 @@
#define PF_XDP AF_XDP
#endif
+enum xsk_prog {
+ XSK_PROG_FALLBACK,
+ XSK_PROG_REDIRECT_FLAGS,
+};
+
struct xsk_umem {
struct xsk_ring_prod *fill_save;
struct xsk_ring_cons *comp_save;
@@ -351,6 +356,55 @@ int xsk_umem__create_v0_0_2(struct xsk_umem **umem_ptr, void *umem_area,
COMPAT_VERSION(xsk_umem__create_v0_0_2, xsk_umem__create, LIBBPF_0.0.2)
DEFAULT_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4)
+
Fyi, removed this extra newline when I applied the series, thanks!
+static enum xsk_prog get_xsk_prog(void)
+{
+ enum xsk_prog detected = XSK_PROG_FALLBACK;
+ struct bpf_load_program_attr prog_attr;
+ struct bpf_create_map_attr map_attr;
+ __u32 size_out, retval, duration;
+ char data_in = 0, data_out;
+ struct bpf_insn insns[] = {
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_MOV64_IMM(BPF_REG_2, 0),
+ BPF_MOV64_IMM(BPF_REG_3, XDP_PASS),
+ BPF_EMIT_CALL(BPF_FUNC_redirect_map),
+ BPF_EXIT_INSN(),
[...]
