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- Log ----------------------------------------------------------------- commit 8286cff9c5bb890d169b58857e3ab6cd118a2af4 Author: Ola Liljedahl ola.liljedahl@arm.com Date: Tue Mar 28 14:23:28 2017 -0500

linux-generic: ring.c: use required memory orderings

Signed-off-by: Ola Liljedahl ola.liljedahl@arm.com Reviewed-by: Brian Brooks brian.brooks@arm.com Signed-off-by: Maxim Uvarov maxim.uvarov@linaro.org

diff --git a/platform/linux-generic/pktio/ring.c b/platform/linux-generic/pktio/ring.c index aeda04b..e3c73d1 100644 --- a/platform/linux-generic/pktio/ring.c +++ b/platform/linux-generic/pktio/ring.c @@ -263,8 +263,8 @@ int ___ring_mp_do_enqueue(_ring_t *r, void * const *obj_table, /* Reset n to the initial burst count */ n = max;

- prod_head = r->prod.head; - cons_tail = r->cons.tail; + prod_head = __atomic_load_n(&r->prod.head, __ATOMIC_RELAXED); + cons_tail = __atomic_load_n(&r->cons.tail, __ATOMIC_ACQUIRE); /* The subtraction is done between two unsigned 32bits value * (the result is always modulo 32 bits even if we have * prod_head > cons_tail). So 'free_entries' is always between 0 @@ -306,12 +306,12 @@ int ___ring_mp_do_enqueue(_ring_t *r, void * const *obj_table, * If there are other enqueues in progress that preceded us, * we need to wait for them to complete */ - while (odp_unlikely(r->prod.tail != prod_head)) + while (odp_unlikely(__atomic_load_n(&r->prod.tail, __ATOMIC_RELAXED) != + prod_head)) odp_cpu_pause();

/* Release our entries and the memory they refer to */ - __atomic_thread_fence(__ATOMIC_RELEASE); - r->prod.tail = prod_next; + __atomic_store_n(&r->prod.tail, prod_next, __ATOMIC_RELEASE); return ret; }

@@ -328,7 +328,7 @@ int ___ring_sp_do_enqueue(_ring_t *r, void * const *obj_table, int ret;

prod_head = r->prod.head; - cons_tail = r->cons.tail; + cons_tail = __atomic_load_n(&r->cons.tail, __ATOMIC_ACQUIRE); /* The subtraction is done between two unsigned 32bits value * (the result is always modulo 32 bits even if we have * prod_head > cons_tail). So 'free_entries' is always between 0 @@ -361,8 +361,7 @@ int ___ring_sp_do_enqueue(_ring_t *r, void * const *obj_table, }

/* Release our entries and the memory they refer to */ - __atomic_thread_fence(__ATOMIC_RELEASE); - r->prod.tail = prod_next; + __atomic_store_n(&r->prod.tail, prod_next, __ATOMIC_RELEASE); return ret; }

@@ -385,8 +384,8 @@ int ___ring_mc_do_dequeue(_ring_t *r, void **obj_table, /* Restore n as it may change every loop */ n = max;

- cons_head = r->cons.head; - prod_tail = r->prod.tail; + cons_head = __atomic_load_n(&r->cons.head, __ATOMIC_RELAXED); + prod_tail = __atomic_load_n(&r->prod.tail, __ATOMIC_ACQUIRE); /* The subtraction is done between two unsigned 32bits value * (the result is always modulo 32 bits even if we have * cons_head > prod_tail). So 'entries' is always between 0 @@ -419,12 +418,12 @@ int ___ring_mc_do_dequeue(_ring_t *r, void **obj_table, * If there are other dequeues in progress that preceded us, * we need to wait for them to complete */ - while (odp_unlikely(r->cons.tail != cons_head)) + while (odp_unlikely(__atomic_load_n(&r->cons.tail, __ATOMIC_RELAXED) != + cons_head)) odp_cpu_pause();

/* Release our entries and the memory they refer to */ - __atomic_thread_fence(__ATOMIC_RELEASE); - r->cons.tail = cons_next; + __atomic_store_n(&r->cons.tail, cons_next, __ATOMIC_RELEASE);

return behavior == _RING_QUEUE_FIXED ? 0 : n; } @@ -441,7 +440,7 @@ int ___ring_sc_do_dequeue(_ring_t *r, void **obj_table, uint32_t mask = r->prod.mask;

cons_head = r->cons.head; - prod_tail = r->prod.tail; + prod_tail = __atomic_load_n(&r->prod.tail, __ATOMIC_ACQUIRE); /* The subtraction is done between two unsigned 32bits value * (the result is always modulo 32 bits even if we have * cons_head > prod_tail). So 'entries' is always between 0 @@ -461,11 +460,10 @@ int ___ring_sc_do_dequeue(_ring_t *r, void **obj_table, r->cons.head = cons_next;

/* Acquire the pointers and the memory they refer to */ - __atomic_thread_fence(__ATOMIC_ACQUIRE); /* copy in table */ DEQUEUE_PTRS();

- r->cons.tail = cons_next; + __atomic_store_n(&r->cons.tail, cons_next, __ATOMIC_RELEASE); return behavior == _RING_QUEUE_FIXED ? 0 : n; }

-----------------------------------------------------------------------

Summary of changes: platform/linux-generic/pktio/ring.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-)

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