[dpdk-dev] [PATCH] net/ena: get device info statically

[Michal Krawczyk <mk@semihalf.com>]

Whenever the app is calling rte_eth_dev_info_get(), it shouldn't use the
admin command. It was causing problems, if it was called from the
secondary process - the main process was crashing, and the secondary app
wasn't getting any result, as the admin request couldn't be processed by
the process which was requesting the data.

To fix that, the data is being written to the adapter structure during
device initialization routine.

Signed-off-by: Michal Krawczyk <mk@semihalf.com>
---
 drivers/net/ena/ena_ethdev.c | 31 ++++++++++++-------------------
 drivers/net/ena/ena_ethdev.h |  8 +++++++-
 2 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 8bb05caa2..08b1ab195 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -1804,9 +1804,14 @@ static int eth_ena_dev_init(struct rte_eth_dev *eth_dev)
 	/* Set max MTU for this device */
 	adapter->max_mtu = get_feat_ctx.dev_attr.max_mtu;
 
-	/* set device support for TSO */
-	adapter->tso4_supported = get_feat_ctx.offload.tx &
-				  ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV4_MASK;
+	/* set device support for offloads */
+	adapter->offloads.tso4_supported = (get_feat_ctx.offload.tx &
+		ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV4_MASK) != 0;
+	adapter->offloads.tx_csum_supported = (get_feat_ctx.offload.tx &
+		ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV4_CSUM_PART_MASK) != 0;
+	adapter->offloads.tx_csum_supported =
+		(get_feat_ctx.offload.rx_supported &
+		ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV4_CSUM_MASK) != 0;
 
 	/* Copy MAC address and point DPDK to it */
 	eth_dev->data->mac_addrs = (struct ether_addr *)adapter->mac_addr;
@@ -1939,9 +1944,7 @@ static void ena_infos_get(struct rte_eth_dev *dev,
 {
 	struct ena_adapter *adapter;
 	struct ena_com_dev *ena_dev;
-	struct ena_com_dev_get_features_ctx feat;
 	uint64_t rx_feat = 0, tx_feat = 0;
-	int rc = 0;
 
 	ena_assert_msg(dev->data != NULL, "Uninitialized device\n");
 	ena_assert_msg(dev->data->dev_private != NULL, "Uninitialized device\n");
@@ -1960,26 +1963,16 @@ static void ena_infos_get(struct rte_eth_dev *dev,
 			ETH_LINK_SPEED_50G  |
 			ETH_LINK_SPEED_100G;
 
-	/* Get supported features from HW */
-	rc = ena_com_get_dev_attr_feat(ena_dev, &feat);
-	if (unlikely(rc)) {
-		RTE_LOG(ERR, PMD,
-			"Cannot get attribute for ena device rc= %d\n", rc);
-		return;
-	}
-
 	/* Set Tx & Rx features available for device */
-	if (feat.offload.tx & ENA_ADMIN_FEATURE_OFFLOAD_DESC_TSO_IPV4_MASK)
+	if (adapter->offloads.tso4_supported)
 		tx_feat	|= DEV_TX_OFFLOAD_TCP_TSO;
 
-	if (feat.offload.tx &
-	    ENA_ADMIN_FEATURE_OFFLOAD_DESC_TX_L4_IPV4_CSUM_PART_MASK)
+	if (adapter->offloads.tx_csum_supported)
 		tx_feat |= DEV_TX_OFFLOAD_IPV4_CKSUM |
 			DEV_TX_OFFLOAD_UDP_CKSUM |
 			DEV_TX_OFFLOAD_TCP_CKSUM;
 
-	if (feat.offload.rx_supported &
-	    ENA_ADMIN_FEATURE_OFFLOAD_DESC_RX_L4_IPV4_CSUM_MASK)
+	if (adapter->offloads.rx_csum_supported)
 		rx_feat |= DEV_RX_OFFLOAD_IPV4_CKSUM |
 			DEV_RX_OFFLOAD_UDP_CKSUM  |
 			DEV_RX_OFFLOAD_TCP_CKSUM;
@@ -2171,7 +2164,7 @@ eth_ena_prep_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 			/* If IPv4 header has DF flag enabled and TSO support is
 			 * disabled, partial chcecksum should not be calculated.
 			 */
-			if (!tx_ring->adapter->tso4_supported)
+			if (!tx_ring->adapter->offloads.tso4_supported)
 				continue;
 		}
 
diff --git a/drivers/net/ena/ena_ethdev.h b/drivers/net/ena/ena_ethdev.h
index 309b92f65..221760c62 100644
--- a/drivers/net/ena/ena_ethdev.h
+++ b/drivers/net/ena/ena_ethdev.h
@@ -167,6 +167,12 @@ struct ena_stats_dev {
 	u64 dev_stop;
 };
 
+struct ena_offloads {
+	bool tso4_supported;
+	bool tx_csum_supported;
+	bool rx_csum_supported;
+};
+
 /* board specific private data structure */
 struct ena_adapter {
 	/* OS defined structs */
@@ -188,7 +194,7 @@ struct ena_adapter {
 
 	u16 num_queues;
 	u16 max_mtu;
-	u8 tso4_supported;
+	struct ena_offloads offloads;
 
 	int id_number;
 	char name[ENA_NAME_MAX_LEN];
-- 
2.14.1