[dpdk-stable] [PATCH 19.11 2/2] net/ena: trigger reset on Tx prepare failure

[Michal Krawczyk <mk@semihalf.com>]

[ upstream commit b57e1053813b369d20bb2a177081a4c8ca63cede ]

If the prepare function failed, then it means the descriptors are in the
invalid state.

This condition now triggers the reset, which should be further handled
by the application.

To notify the application about prepare function failure, the error log
was added. In general, it should never fail in normal conditions, as the
Tx function checks for the available space in the Tx ring before the
preparation even starts.

Fixes: 2081d5e2e92d ("net/ena: add reset routine")
Cc: stable@dpdk.org

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Shay Agroskin <shayagr@amazon.com>
---
 drivers/net/ena/ena_ethdev.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 6c9a2aa1a9..408e127511 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -2359,7 +2359,12 @@ static uint16_t eth_ena_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 		rc = ena_com_prepare_tx(tx_ring->ena_com_io_sq,
 					&ena_tx_ctx, &nb_hw_desc);
 		if (unlikely(rc)) {
+			PMD_DRV_LOG(ERR,
+				"Failed to prepare Tx buffers, rc: %d\n", rc);
 			++tx_ring->tx_stats.prepare_ctx_err;
+			tx_ring->adapter->reset_reason =
+				ENA_REGS_RESET_DRIVER_INVALID_STATE;
+			tx_ring->adapter->trigger_reset = true;
 			break;
 		}
 		tx_info->tx_descs = nb_hw_desc;
-- 
2.25.1