* [dpdk-dev] [PATCH] event/cnxk: fix reading stale Tx queue depth
@ 2021-07-20 7:04 pbhagavatula
2021-07-30 10:58 ` Jerin Jacob
0 siblings, 1 reply; 2+ messages in thread
From: pbhagavatula @ 2021-07-20 7:04 UTC (permalink / raw)
To: jerinj, Pavan Nikhilesh, Shijith Thotton; +Cc: dev
From: Pavan Nikhilesh <pbhagavatula@marvell.com>
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>
---
Please squash this into next-event tree
drivers/event/cnxk/cn9k_worker.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/event/cnxk/cn9k_worker.h b/drivers/event/cnxk/cn9k_worker.h
index cc1e141957..9b2a0bf882 100644
--- 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))
;
}
--
2.17.1
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2021-07-20 7:04 [dpdk-dev] [PATCH] event/cnxk: fix reading stale Tx queue depth pbhagavatula
2021-07-30 10:58 ` Jerin Jacob
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