eth: fbnic: Add ethtool support for fbnic

Add ethtool ops support and enable 'get_drvinfo' for fbnic. The driver
provides firmware version information while the driver name and bus
information is provided by ethtool_get_drvinfo().
Signed-off-by: Mohsin Bashir <mohsin.bashr@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/meta/fbnic/Makefile

@@ -8,6 +8,7 @@
 obj-$(CONFIG_FBNIC) += fbnic.o
 
 fbnic-y := fbnic_devlink.o \
+	   fbnic_ethtool.o \
 	   fbnic_fw.o \
 	   fbnic_irq.o \
 	   fbnic_mac.o \

drivers/net/ethernet/meta/fbnic/fbnic.h

@@ -132,6 +132,9 @@ void fbnic_free_irq(struct fbnic_dev *dev, int nr, void *data);
 void fbnic_free_irqs(struct fbnic_dev *fbd);
 int fbnic_alloc_irqs(struct fbnic_dev *fbd);
 
+void fbnic_get_fw_ver_commit_str(struct fbnic_dev *fbd, char *fw_version,
+				 const size_t str_sz);
+
 enum fbnic_boards {
 	fbnic_board_asic
 };

drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c

+#include <linux/ethtool.h>
+#include <linux/netdevice.h>
+#include <linux/pci.h>
+
+#include "fbnic.h"
+#include "fbnic_netdev.h"
+#include "fbnic_tlv.h"
+
+static void
+fbnic_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *drvinfo)
+{
+	struct fbnic_net *fbn = netdev_priv(netdev);
+	struct fbnic_dev *fbd = fbn->fbd;
+
+	fbnic_get_fw_ver_commit_str(fbd, drvinfo->fw_version,
+				    sizeof(drvinfo->fw_version));
+}
+
+static const struct ethtool_ops fbnic_ethtool_ops = {
+	.get_drvinfo		= fbnic_get_drvinfo,
+};
+
+void fbnic_set_ethtool_ops(struct net_device *dev)
+{
+	dev->ethtool_ops = &fbnic_ethtool_ops;
+}

drivers/net/ethernet/meta/fbnic/fbnic_fw.c

@@ -789,3 +789,16 @@ void fbnic_mbx_flush_tx(struct fbnic_dev *fbd)
 		count += (tx_mbx->head - head) % FBNIC_IPC_MBX_DESC_LEN;
 	} while (count < FBNIC_IPC_MBX_DESC_LEN && --attempts);
 }
+
+void fbnic_get_fw_ver_commit_str(struct fbnic_dev *fbd, char *fw_version,
+				 const size_t str_sz)
+{
+	struct fbnic_fw_ver *mgmt = &fbd->fw_cap.running.mgmt;
+	const char *delim = "";
+
+	if (mgmt->commit[0])
+		delim = "_";
+
+	fbnic_mk_full_fw_ver_str(mgmt->version, delim, mgmt->commit,
+				 fw_version, str_sz);
+}

drivers/net/ethernet/meta/fbnic/fbnic_fw.h

@@ -53,10 +53,10 @@ int fbnic_fw_xmit_ownership_msg(struct fbnic_dev *fbd, bool take_ownership);
 int fbnic_fw_init_heartbeat(struct fbnic_dev *fbd, bool poll);
 void fbnic_fw_check_heartbeat(struct fbnic_dev *fbd);
 
-#define fbnic_mk_full_fw_ver_str(_rev_id, _delim, _commit, _str)	\
+#define fbnic_mk_full_fw_ver_str(_rev_id, _delim, _commit, _str, _str_sz) \
 do {									\
 	const u32 __rev_id = _rev_id;					\
-	snprintf(_str, sizeof(_str), "%02lu.%02lu.%02lu-%03lu%s%s",	\
+	snprintf(_str, _str_sz, "%02lu.%02lu.%02lu-%03lu%s%s",	\
 		 FIELD_GET(FBNIC_FW_CAP_RESP_VERSION_MAJOR, __rev_id),	\
 		 FIELD_GET(FBNIC_FW_CAP_RESP_VERSION_MINOR, __rev_id),	\
 		 FIELD_GET(FBNIC_FW_CAP_RESP_VERSION_PATCH, __rev_id),	\
@@ -65,7 +65,7 @@ do {									\
 } while (0)
 
 #define fbnic_mk_fw_ver_str(_rev_id, _str) \
-	fbnic_mk_full_fw_ver_str(_rev_id, "", "", _str)
+	fbnic_mk_full_fw_ver_str(_rev_id, "", "", _str, sizeof(_str))
 
 #define FW_HEARTBEAT_PERIOD		(10 * HZ)
 

drivers/net/ethernet/meta/fbnic/fbnic_netdev.c

@@ -521,6 +521,8 @@ struct net_device *fbnic_netdev_alloc(struct fbnic_dev *fbd)
 	netdev->netdev_ops = &fbnic_netdev_ops;
 	netdev->stat_ops = &fbnic_stat_ops;
 
+	fbnic_set_ethtool_ops(netdev);
+
 	fbn = netdev_priv(netdev);
 
 	fbn->netdev = netdev;

drivers/net/ethernet/meta/fbnic/fbnic_netdev.h

@@ -58,6 +58,7 @@ int fbnic_netdev_register(struct net_device *netdev);
 void fbnic_netdev_unregister(struct net_device *netdev);
 void fbnic_reset_queues(struct fbnic_net *fbn,
 			unsigned int tx, unsigned int rx);
+void fbnic_set_ethtool_ops(struct net_device *dev);
 
 void __fbnic_set_rx_mode(struct net_device *netdev);
 void fbnic_clear_rx_mode(struct net_device *netdev);