event/cnxk: fix reading stale Tx queue depth

Reads to Tx queue FC memory need to be atomic to avoid cores using
same Tx queue spinning on stale values.

Fixes: 313e884a22fd ("event/cnxk: support Tx adapter fast path")

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>

diff --git a/drivers/event/cnxk/cn9k_worker.h b/drivers/event/cnxk/cn9k_worker.h
index cc1e141..9b2a0bf 100644 (file)
--- a/drivers/event/cnxk/cn9k_worker.h
+++ b/drivers/event/cnxk/cn9k_worker.h
@@ -420,7 +420,8 @@ NIX_RX_FASTPATH_MODES
 static __rte_always_inline void
 cn9k_sso_txq_fc_wait(const struct cn9k_eth_txq *txq)
 {
-       while (!(((txq)->nb_sqb_bufs_adj - *(txq)->fc_mem)
+       while (!((txq->nb_sqb_bufs_adj -
+                 __atomic_load_n(txq->fc_mem, __ATOMIC_RELAXED))
                 << (txq)->sqes_per_sqb_log2))
                ;
 }