[PATCH v4 04/31] net/ena: sub-optimal configuration notifications support

[<shaibran@amazon.com>]

From: Shai Brandes <shaibran@amazon.com>

ENA device will send asynchronous notifications to the
driver in order to notify users about sub-optimal configurations
and refer them to public AWS documentation for further action.

Signed-off-by: Shai Brandes <shaibran@amazon.com>
Reviewed-by: Amit Bernstein <amitbern@amazon.com>
---
 doc/guides/rel_notes/release_24_03.rst        |  1 +
 .../net/ena/base/ena_defs/ena_admin_defs.h    | 11 +++++++-
 drivers/net/ena/ena_ethdev.c                  | 26 +++++++++++++++++--
 3 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/doc/guides/rel_notes/release_24_03.rst b/doc/guides/rel_notes/release_24_03.rst
index 0fe8bc9739..a30be47241 100644
--- a/doc/guides/rel_notes/release_24_03.rst
+++ b/doc/guides/rel_notes/release_24_03.rst
@@ -106,6 +106,7 @@ New Features
 * **Updated Amazon ena (Elastic Network Adapter) net driver.**
 
   * Removed the reporting of `rx_overruns` errors from xstats and instead updated `imissed` stat with its value.
+  * Added support for sub-optimal configuration notifications from the device.
 
 * **Updated Atomic Rules' Arkville driver.**
 
diff --git a/drivers/net/ena/base/ena_defs/ena_admin_defs.h b/drivers/net/ena/base/ena_defs/ena_admin_defs.h
index fa43e22918..4172916551 100644
--- a/drivers/net/ena/base/ena_defs/ena_admin_defs.h
+++ b/drivers/net/ena/base/ena_defs/ena_admin_defs.h
@@ -1214,7 +1214,8 @@ enum ena_admin_aenq_group {
 	ENA_ADMIN_NOTIFICATION                      = 3,
 	ENA_ADMIN_KEEP_ALIVE                        = 4,
 	ENA_ADMIN_REFRESH_CAPABILITIES              = 5,
-	ENA_ADMIN_AENQ_GROUPS_NUM                   = 6,
+	ENA_ADMIN_CONF_NOTIFICATIONS                = 6,
+	ENA_ADMIN_AENQ_GROUPS_NUM                   = 7,
 };
 
 enum ena_admin_aenq_notification_syndrome {
@@ -1251,6 +1252,14 @@ struct ena_admin_aenq_keep_alive_desc {
 	uint32_t rx_overruns_high;
 };
 
+struct ena_admin_aenq_conf_notifications_desc {
+	struct ena_admin_aenq_common_desc aenq_common_desc;
+
+	uint64_t notifications_bitmap;
+
+	uint64_t reserved;
+};
+
 struct ena_admin_ena_mmio_req_read_less_resp {
 	uint16_t req_id;
 
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index d3f395a832..3157237c0d 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -36,6 +36,10 @@
 
 #define ENA_MIN_RING_DESC	128
 
+#define BITS_PER_BYTE 8
+
+#define BITS_PER_TYPE(type) (sizeof(type) * BITS_PER_BYTE)
+
 /*
  * We should try to keep ENA_CLEANUP_BUF_SIZE lower than
  * RTE_MEMPOOL_CACHE_MAX_SIZE, so we can fit this in mempool local cache.
@@ -1842,7 +1846,8 @@ static int ena_device_init(struct ena_adapter *adapter,
 		      BIT(ENA_ADMIN_NOTIFICATION) |
 		      BIT(ENA_ADMIN_KEEP_ALIVE) |
 		      BIT(ENA_ADMIN_FATAL_ERROR) |
-		      BIT(ENA_ADMIN_WARNING);
+		      BIT(ENA_ADMIN_WARNING) |
+		      BIT(ENA_ADMIN_CONF_NOTIFICATIONS);
 
 	aenq_groups &= get_feat_ctx->aenq.supported_groups;
 
@@ -4021,6 +4026,22 @@ static void ena_keep_alive(void *adapter_data,
 	adapter->dev_stats.tx_drops = tx_drops;
 }
 
+static void ena_suboptimal_configuration(__rte_unused void *adapter_data,
+					 struct ena_admin_aenq_entry *aenq_e)
+{
+	struct ena_admin_aenq_conf_notifications_desc *desc;
+	int bit, num_bits;
+
+	desc = (struct ena_admin_aenq_conf_notifications_desc *)aenq_e;
+	num_bits = BITS_PER_TYPE(desc->notifications_bitmap);
+	for (bit = 0; bit < num_bits; bit++) {
+		if (desc->notifications_bitmap & RTE_BIT64(bit)) {
+			PMD_DRV_LOG(WARNING,
+				"Sub-optimal configuration notification code: %d\n", bit + 1);
+		}
+	}
+}
+
 /**
  * This handler will called for unknown event group or unimplemented handlers
  **/
@@ -4035,7 +4056,8 @@ static struct ena_aenq_handlers aenq_handlers = {
 	.handlers = {
 		[ENA_ADMIN_LINK_CHANGE] = ena_update_on_link_change,
 		[ENA_ADMIN_NOTIFICATION] = ena_notification,
-		[ENA_ADMIN_KEEP_ALIVE] = ena_keep_alive
+		[ENA_ADMIN_KEEP_ALIVE] = ena_keep_alive,
+		[ENA_ADMIN_CONF_NOTIFICATIONS] = ena_suboptimal_configuration
 	},
 	.unimplemented_handler = unimplemented_aenq_handler
 };
-- 
2.17.1