[dpdk-dev] [PATCH 11/20] net/ena/base: check for RSS key configuration support

[Michal Krawczyk <mk@semihalf.com>]

Setting RSS hash function could not be supported by the device. In that
situation there is no need to fill in default hash key or even allocate
hash key.

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Igor Chauskin <igorch@amazon.com>
Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
---
 drivers/net/ena/base/ena_com.c                 | 13 ++++++++++---
 drivers/net/ena/base/ena_defs/ena_admin_defs.h | 15 ++++++++++++++-
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ena/base/ena_com.c b/drivers/net/ena/base/ena_com.c
index ea7d6788c9..9764bd2f48 100644
--- a/drivers/net/ena/base/ena_com.c
+++ b/drivers/net/ena/base/ena_com.c
@@ -1083,6 +1083,9 @@ static int ena_com_hash_key_allocate(struct ena_com_dev *ena_dev)
 {
 	struct ena_rss *rss = &ena_dev->rss;
 
+	if (!ena_com_check_supported_feature_id(ena_dev, ENA_ADMIN_RSS_HASH_FUNCTION))
+		return ENA_COM_UNSUPPORTED;
+
 	ENA_MEM_ALLOC_COHERENT(ena_dev->dmadev,
 			       sizeof(*rss->hash_key),
 			       rss->hash_key,
@@ -2719,12 +2722,16 @@ int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 indr_tbl_log_size)
 	if (unlikely(rc))
 		goto err_indr_tbl;
 
+	/* The following function might return unsupported in case the
+	 * device doesn't support setting the key / hash function. We can safely
+	 * ignore this error and have indirection table support only.
+	 */
 	rc = ena_com_hash_key_allocate(ena_dev);
-	if (unlikely(rc))
+	if (likely(!rc))
+		ena_com_hash_key_fill_default_key(ena_dev);
+	else if (rc != ENA_COM_UNSUPPORTED)
 		goto err_hash_key;
 
-	ena_com_hash_key_fill_default_key(ena_dev);
-
 	rc = ena_com_hash_ctrl_init(ena_dev);
 	if (unlikely(rc))
 		goto err_hash_ctrl;
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 9cea1c3905..30e5eead71 100644
--- a/drivers/net/ena/base/ena_defs/ena_admin_defs.h
+++ b/drivers/net/ena/base/ena_defs/ena_admin_defs.h
@@ -873,7 +873,8 @@ struct ena_admin_host_info {
 	 * 1 : rx_offset
 	 * 2 : interrupt_moderation
 	 * 3 : map_rx_buf_bidirectional
-	 * 31:4 : reserved
+	 * 4 : rss_configurable_function_key
+	 * 31:5 : reserved
 	 */
 	uint32_t driver_supported_features;
 };
@@ -1198,6 +1199,8 @@ struct ena_admin_ena_mmio_req_read_less_resp {
 #define ENA_ADMIN_HOST_INFO_INTERRUPT_MODERATION_MASK       BIT(2)
 #define ENA_ADMIN_HOST_INFO_MAP_RX_BUF_BIDIRECTIONAL_SHIFT  3
 #define ENA_ADMIN_HOST_INFO_MAP_RX_BUF_BIDIRECTIONAL_MASK   BIT(3)
+#define ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_SHIFT 4
+#define ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_MASK BIT(4)
 
 /* feature_rss_ind_table */
 #define ENA_ADMIN_FEATURE_RSS_IND_TABLE_ONE_ENTRY_UPDATE_MASK BIT(0)
@@ -1659,6 +1662,16 @@ static inline void set_ena_admin_host_info_map_rx_buf_bidirectional(struct ena_a
 	p->driver_supported_features |= (val << ENA_ADMIN_HOST_INFO_MAP_RX_BUF_BIDIRECTIONAL_SHIFT) & ENA_ADMIN_HOST_INFO_MAP_RX_BUF_BIDIRECTIONAL_MASK;
 }
 
+static inline uint32_t get_ena_admin_host_info_rss_configurable_function_key(const struct ena_admin_host_info *p)
+{
+	return (p->driver_supported_features & ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_MASK) >> ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_SHIFT;
+}
+
+static inline void set_ena_admin_host_info_rss_configurable_function_key(struct ena_admin_host_info *p, uint32_t val)
+{
+	p->driver_supported_features |= (val << ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_SHIFT) & ENA_ADMIN_HOST_INFO_RSS_CONFIGURABLE_FUNCTION_KEY_MASK;
+}
+
 static inline uint8_t get_ena_admin_feature_rss_ind_table_one_entry_update(const struct ena_admin_feature_rss_ind_table *p)
 {
 	return p->flags & ENA_ADMIN_FEATURE_RSS_IND_TABLE_ONE_ENTRY_UPDATE_MASK;
-- 
2.25.1