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samples/bpf: xdpsock: order memory on AArch64

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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: Brian Brooks <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
This commit is contained in:
Brian Brooks 2018-07-25 16:08:19 -05:00 • committed by Daniel Borkmann
commit 598135e744
1 changed files with 5 additions and 0 deletions
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samples/bpf/xdpsock_user.c
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@ -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)