First, fix the bug that keyword const of func arg should be after "*".
This is because const before "*" means the value of "cbi" should not be
changed. But we should monitor that cbi->use changed and then we can
jump out of loop.

Second, instead of polling for cbi->use to be updated, use
wait event scheme.

Fixes: a93ff62a8938 ("bpf: introduce basic Rx/Tx filters")
Cc: konstantin.anan...@intel.com
Cc: sta...@dpdk.org

Signed-off-by: Feifei Wang <feifei.wa...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
---
 lib/bpf/bpf_pkt.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/lib/bpf/bpf_pkt.c b/lib/bpf/bpf_pkt.c
index 6e8248f0d6..08ed8ff68c 100644
--- a/lib/bpf/bpf_pkt.c
+++ b/lib/bpf/bpf_pkt.c
@@ -111,9 +111,9 @@ bpf_eth_cbi_unuse(struct bpf_eth_cbi *cbi)
  * Waits till datapath finished using given callback.
  */
 static void
-bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
+bpf_eth_cbi_wait(struct bpf_eth_cbi *const cbi)
 {
-       uint32_t nuse, puse;
+       uint32_t puse;
 
        /* make sure all previous loads and stores are completed */
        rte_smp_mb();
@@ -122,11 +122,8 @@ bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
 
        /* in use, busy wait till current RX/TX iteration is finished */
        if ((puse & BPF_ETH_CBI_INUSE) != 0) {
-               do {
-                       rte_pause();
-                       rte_compiler_barrier();
-                       nuse = cbi->use;
-               } while (nuse == puse);
+               rte_compiler_barrier();
+               rte_wait_event_32(&cbi->use, UINT_MAX, puse, ==, 
__ATOMIC_RELAXED);
        }
 }
 
-- 
2.25.1

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