[PATCH 2/3] net/ena: support malformed Rx descriptor error

[<shaibran@amazon.com>]

From: Shai Brandes <shaibran@amazon.com>

Add validation check for packet descriptor consistency
and improve reset logic and stats tracking.

Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
---
 doc/guides/rel_notes/release_24_11.rst |  1 +
 drivers/net/ena/ena_ethdev.c           | 29 +++++++++++++++++++-------
 drivers/net/ena/ena_ethdev.h           |  2 ++
 3 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/doc/guides/rel_notes/release_24_11.rst b/doc/guides/rel_notes/release_24_11.rst
index fa4822d928..e94564b8b7 100644
--- a/doc/guides/rel_notes/release_24_11.rst
+++ b/doc/guides/rel_notes/release_24_11.rst
@@ -142,6 +142,7 @@ New Features
   * Modified the PMD API that controls the LLQ header policy.
   * Replaced ``enable_llq``, ``normal_llq_hdr`` and ``large_llq_hdr`` devargs
     with a new shared devarg ``llq_policy`` that keeps the same logic.
+  * Added validation check for Rx packet descriptor consistency.
 
 * **Updated Cisco enic driver.**
 
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 1a652b09ac..bba48ea1cc 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -162,6 +162,8 @@ static const struct ena_stats ena_stats_rx_strings[] = {
 	ENA_STAT_RX_ENTRY(mbuf_alloc_fail),
 	ENA_STAT_RX_ENTRY(bad_desc_num),
 	ENA_STAT_RX_ENTRY(bad_req_id),
+	ENA_STAT_RX_ENTRY(bad_desc),
+	ENA_STAT_RX_ENTRY(unknown_error),
 };
 
 #define ENA_STATS_ARRAY_GLOBAL	ARRAY_SIZE(ena_stats_global_strings)
@@ -1262,7 +1264,9 @@ static int ena_stats_get(struct rte_eth_dev *dev,
 		stats->q_ibytes[i] = rx_stats->bytes;
 		stats->q_ipackets[i] = rx_stats->cnt;
 		stats->q_errors[i] = rx_stats->bad_desc_num +
-			rx_stats->bad_req_id;
+			rx_stats->bad_req_id +
+			rx_stats->bad_desc +
+			rx_stats->unknown_error;
 	}
 
 	max_rings_stats = RTE_MIN(dev->data->nb_tx_queues,
@@ -2772,6 +2776,7 @@ static uint16_t eth_ena_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 	struct ena_ring *rx_ring = (struct ena_ring *)(rx_queue);
 	unsigned int free_queue_entries;
 	uint16_t next_to_clean = rx_ring->next_to_clean;
+	enum ena_regs_reset_reason_types reset_reason;
 	uint16_t descs_in_use;
 	struct rte_mbuf *mbuf;
 	uint16_t completed;
@@ -2804,15 +2809,25 @@ static uint16_t eth_ena_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 			PMD_RX_LOG_LINE(ERR,
 				"Failed to get the packet from the device, rc: %d",
 				rc);
-			if (rc == ENA_COM_NO_SPACE) {
+			switch (rc) {
+			case ENA_COM_NO_SPACE:
 				++rx_ring->rx_stats.bad_desc_num;
-				ena_trigger_reset(rx_ring->adapter,
-					ENA_REGS_RESET_TOO_MANY_RX_DESCS);
-			} else {
+				reset_reason = ENA_REGS_RESET_TOO_MANY_RX_DESCS;
+				break;
+			case ENA_COM_FAULT:
+				++rx_ring->rx_stats.bad_desc;
+				reset_reason = ENA_REGS_RESET_RX_DESCRIPTOR_MALFORMED;
+				break;
+			case ENA_COM_EIO:
 				++rx_ring->rx_stats.bad_req_id;
-				ena_trigger_reset(rx_ring->adapter,
-					ENA_REGS_RESET_INV_RX_REQ_ID);
+				reset_reason = ENA_REGS_RESET_INV_RX_REQ_ID;
+				break;
+			default:
+				++rx_ring->rx_stats.unknown_error;
+				reset_reason = ENA_REGS_RESET_DRIVER_INVALID_STATE;
+				break;
 			}
+			ena_trigger_reset(rx_ring->adapter, reset_reason);
 			return 0;
 		}
 
diff --git a/drivers/net/ena/ena_ethdev.h b/drivers/net/ena/ena_ethdev.h
index fe7d4a2d65..b8aead8f46 100644
--- a/drivers/net/ena/ena_ethdev.h
+++ b/drivers/net/ena/ena_ethdev.h
@@ -140,6 +140,8 @@ struct ena_stats_rx {
 	u64 mbuf_alloc_fail;
 	u64 bad_desc_num;
 	u64 bad_req_id;
+	u64 bad_desc;
+	u64 unknown_error;
 };
 
 struct __rte_cache_aligned ena_ring {
-- 
2.17.1