Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 598135e7 authored by Brian Brooks's avatar Brian Brooks Committed by Daniel Borkmann
Browse files

samples/bpf: xdpsock: order memory on AArch64 



Define u_smp_rmb() and u_smp_wmb() to respective barrier instructions.
This ensures the processor will order accesses to queue indices against
accesses to queue ring entries.

Signed-off-by: default avatarBrian Brooks <brian.brooks@linaro.org>
Acked-by: default avatarBjörn Töpel <bjorn.topel@intel.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent 08a85252

samples/bpf/xdpsock_user.c

+5 −0
Original line number Diff line number Diff line
@@ -145,8 +145,13 @@ static void dump_stats(void); 
	} while (0)



#define barrier() __asm__ __volatile__("": : :"memory")

#ifdef __aarch64__

#define u_smp_rmb() __asm__ __volatile__("dmb ishld": : :"memory")

#define u_smp_wmb() __asm__ __volatile__("dmb ishst": : :"memory")

#else

#define u_smp_rmb() barrier()

#define u_smp_wmb() barrier()

#endif

#define likely(x) __builtin_expect(!!(x), 1)

#define unlikely(x) __builtin_expect(!!(x), 0)