[dpdk-dev] [PATCH v3 01/30] net/ena: check if size of buffer is at least 1400B

[Michal Krawczyk <mk@semihalf.com>]

Some of the ENA devices can't handle buffers which are smaller than a
1400B. Because of this limitation, size of the buffer is being checked
and limited during the Rx queue setup.

If it's below the allowed value, PMD won't finish it's configuration
successfully..

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Igor Chauskin <igorch@amazon.com>
Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
---
v2:
  * Remove debug printout
  * Change the way of acquiring mempool size

v3:
  * Update the copyright date in modified files

 drivers/net/ena/ena_ethdev.c | 12 +++++++++++-
 drivers/net/ena/ena_ethdev.h |  3 ++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 665afee4f0..64aabbbb19 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright (c) 2015-2019 Amazon.com, Inc. or its affiliates.
+ * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
  * All rights reserved.
  */
 
@@ -1282,6 +1282,7 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 {
 	struct ena_adapter *adapter = dev->data->dev_private;
 	struct ena_ring *rxq = NULL;
+	size_t buffer_size;
 	int i;
 
 	rxq = &adapter->rx_ring[queue_idx];
@@ -1309,6 +1310,15 @@ static int ena_rx_queue_setup(struct rte_eth_dev *dev,
 		return -EINVAL;
 	}
 
+	/* ENA isn't supporting buffers smaller than 1400 bytes */
+	buffer_size = rte_pktmbuf_data_room_size(mp) - RTE_PKTMBUF_HEADROOM;
+	if (buffer_size < ENA_RX_BUF_MIN_SIZE) {
+		PMD_DRV_LOG(ERR,
+			"Unsupported size of RX buffer: %zu (min size: %d)\n",
+			buffer_size, ENA_RX_BUF_MIN_SIZE);
+		return -EINVAL;
+	}
+
 	rxq->port_id = dev->data->port_id;
 	rxq->next_to_clean = 0;
 	rxq->next_to_use = 0;
diff --git a/drivers/net/ena/ena_ethdev.h b/drivers/net/ena/ena_ethdev.h
index af5eeea280..e9b55dc029 100644
--- a/drivers/net/ena/ena_ethdev.h
+++ b/drivers/net/ena/ena_ethdev.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright (c) 2015-2019 Amazon.com, Inc. or its affiliates.
+ * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
  * All rights reserved.
  */
 
@@ -20,6 +20,7 @@
 #define ENA_MIN_FRAME_LEN	64
 #define ENA_NAME_MAX_LEN	20
 #define ENA_PKT_MAX_BUFS	17
+#define ENA_RX_BUF_MIN_SIZE	1400
 
 #define ENA_MIN_MTU		128
 
-- 
2.20.1