[dpdk-dev] [PATCH] kni: fix kni rx fifo producer synchronization

[Kiran Kumar <kkokkilagadda@caviumnetworks.com>]

With existing code in kni_fifo_put, rx_q values are not being updated
before updating fifo_write. While reading rx_q in kni_net_rx_normal,
This is causing the sync issue on other core. So adding a write
barrier to make sure the values being synced before updating fifo_write.

Fixes: 3fc5ca2f6352 ("kni: initial import")

Signed-off-by: Kiran Kumar <kkokkilagadda@caviumnetworks.com>
---
 lib/librte_kni/rte_kni_fifo.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/librte_kni/rte_kni_fifo.h b/lib/librte_kni/rte_kni_fifo.h
index ac26a8c..4d6b33e 100644
--- a/lib/librte_kni/rte_kni_fifo.h
+++ b/lib/librte_kni/rte_kni_fifo.h
@@ -39,6 +39,7 @@ kni_fifo_put(struct rte_kni_fifo *fifo, void **data, unsigned num)
 		fifo->buffer[fifo_write] = data[i];
 		fifo_write = new_write;
 	}
+	rte_smp_wmb();
 	fifo->write = fifo_write;
 	return i;
 }
-- 
2.7.4