[PATCH net-next v2 1/2] eth: fbnic: Add ethtool support for fbnic

[Mohsin Bashir <mohsin.bashr@gmail.com>]

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>
---
v2:
- Update the emptiness check for firmware version commit string
- Rebase to the latest

v1: https://lore.kernel.org/netdev/20240807002445.3833895-1-mohsin.bashr@gmail.com
---
 drivers/net/ethernet/meta/fbnic/Makefile      |  1 +
 drivers/net/ethernet/meta/fbnic/fbnic.h       |  3 +++
 .../net/ethernet/meta/fbnic/fbnic_ethtool.c   | 26 +++++++++++++++++++
 drivers/net/ethernet/meta/fbnic/fbnic_fw.c    | 13 ++++++++++
 drivers/net/ethernet/meta/fbnic/fbnic_fw.h    |  6 ++---
 .../net/ethernet/meta/fbnic/fbnic_netdev.c    |  2 ++
 .../net/ethernet/meta/fbnic/fbnic_netdev.h    |  1 +
 7 files changed, 49 insertions(+), 3 deletions(-)
 create mode 100644 drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c

diff --git a/drivers/net/ethernet/meta/fbnic/Makefile b/drivers/net/ethernet/meta/fbnic/Makefile
index 9373b558fdc9..37cfc34a5118 100644
--- a/drivers/net/ethernet/meta/fbnic/Makefile
+++ b/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 \
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic.h b/drivers/net/ethernet/meta/fbnic/fbnic.h
index ad2689bfd6cb..28d970f81bfc 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic.h
+++ b/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
 };
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c b/drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c
new file mode 100644
index 000000000000..7064dfc9f5b0
--- /dev/null
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c
@@ -0,0 +1,26 @@
+#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;
+}
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c b/drivers/net/ethernet/meta/fbnic/fbnic_fw.c
index 0c6e1b4c119b..8f7a2a19ddf8 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_fw.c
+++ b/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);
+}
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_fw.h b/drivers/net/ethernet/meta/fbnic/fbnic_fw.h
index c65bca613665..221faf8c6756 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_fw.h
+++ b/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)
 
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
index 571374361259..a400616a24d4 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c
+++ b/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;
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h
index 60199e634468..6c27da09a612 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h
+++ b/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);
-- 
2.43.5