[PATCH 03/14] net: ionic: Export the APIs from net driver to get RDMA capabilities

[Abhijit Gangurde <abhijit.gangurde@amd.com>]

Export APIs from net driver allowing RDMA driver to get basic
device configuration and RDMA capabilities to create ibdev.

Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Co-developed-by: Allen Hubbe <allen.hubbe@amd.com>
Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
---
 drivers/net/ethernet/pensando/ionic/Makefile  |  2 +-
 .../net/ethernet/pensando/ionic/ionic_api.c   | 40 ++++++++++++++++
 .../net/ethernet/pensando/ionic/ionic_api.h   | 47 +++++++++++++++++++
 .../net/ethernet/pensando/ionic/ionic_dev.h   |  8 +---
 .../net/ethernet/pensando/ionic/ionic_if.h    | 26 ++++++++--
 5 files changed, 110 insertions(+), 13 deletions(-)
 create mode 100644 drivers/net/ethernet/pensando/ionic/ionic_api.c

diff --git a/drivers/net/ethernet/pensando/ionic/Makefile b/drivers/net/ethernet/pensando/ionic/Makefile
index a598972fef41..4696f8ee234f 100644
--- a/drivers/net/ethernet/pensando/ionic/Makefile
+++ b/drivers/net/ethernet/pensando/ionic/Makefile
@@ -5,5 +5,5 @@ obj-$(CONFIG_IONIC) := ionic.o
 
 ionic-y := ionic_main.o ionic_bus_pci.o ionic_devlink.o ionic_dev.o \
 	   ionic_debugfs.o ionic_lif.o ionic_rx_filter.o ionic_ethtool.o \
-	   ionic_txrx.o ionic_stats.o ionic_fw.o ionic_aux.o
+	   ionic_txrx.o ionic_stats.o ionic_fw.o ionic_aux.o ionic_api.o
 ionic-$(CONFIG_PTP_1588_CLOCK) += ionic_phc.o
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_api.c b/drivers/net/ethernet/pensando/ionic/ionic_api.c
new file mode 100644
index 000000000000..8c39e6183ad4
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_api.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2018-2025, Advanced Micro Devices, Inc. */
+
+#include <linux/kernel.h>
+
+#include "ionic.h"
+#include "ionic_lif.h"
+
+struct net_device *ionic_api_get_netdev_from_handle(void *handle)
+{
+	struct ionic_lif *lif = handle;
+
+	if (!lif)
+		return ERR_PTR(-ENXIO);
+
+	dev_hold(lif->netdev);
+
+	return lif->netdev;
+}
+EXPORT_SYMBOL_NS(ionic_api_get_netdev_from_handle, "NET_IONIC");
+
+const union ionic_lif_identity *ionic_api_get_identity(void *handle,
+						       int *lif_index)
+{
+	struct ionic_lif *lif = handle;
+
+	if (lif_index)
+		*lif_index = lif->index;
+
+	return &lif->ionic->ident.lif;
+}
+EXPORT_SYMBOL_NS(ionic_api_get_identity, "NET_IONIC");
+
+const struct ionic_devinfo *ionic_api_get_devinfo(void *handle)
+{
+	struct ionic_lif *lif = handle;
+
+	return &lif->ionic->idev.dev_info;
+}
+EXPORT_SYMBOL_NS(ionic_api_get_devinfo, "NET_IONIC");
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_api.h b/drivers/net/ethernet/pensando/ionic/ionic_api.h
index a7e398e1de21..f59391102c62 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_api.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_api.h
@@ -5,6 +5,8 @@
 #define _IONIC_API_H_
 
 #include <linux/auxiliary_bus.h>
+#include "ionic_if.h"
+#include "ionic_regs.h"
 
 /**
  * struct ionic_aux_dev - Auxiliary device information
@@ -18,4 +20,49 @@ struct ionic_aux_dev {
 	struct auxiliary_device adev;
 };
 
+/**
+ * struct ionic_devinfo - device information
+ * @asic_type:      Device ASIC type code
+ * @asic_rev:       Device ASIC revision code
+ * @fw_version:     Device firmware version, as a string
+ * @serial_num:     Device serial number, as a string
+ */
+struct ionic_devinfo {
+	u8 asic_type;
+	u8 asic_rev;
+	char fw_version[IONIC_DEVINFO_FWVERS_BUFLEN + 1];
+	char serial_num[IONIC_DEVINFO_SERIAL_BUFLEN + 1];
+};
+
+/**
+ * ionic_api_get_identity - Get result of device identification
+ * @handle:     Handle to lif
+ * @lif_index:  This lif index
+ *
+ * Return: pointer to result of identification
+ */
+const union ionic_lif_identity *ionic_api_get_identity(void *handle,
+						       int *lif_index);
+
+/**
+ * ionic_api_get_netdev_from_handle - Get a network device associated with the
+ *                                    handle
+ * @handle:     Handle to lif
+ *
+ * This returns a network device associated with the lif handle.
+ * If network device is available it holds the reference to device. Caller must
+ * ensure that it releases the device using dev_put() after its usage.
+ *
+ * Return: Network device on success or ERR_PTR(error)
+ */
+struct net_device *ionic_api_get_netdev_from_handle(void *handle);
+
+/**
+ * ionic_api_get_devinfo - Get device information
+ * @handle:     Handle to lif
+ *
+ * Return: pointer to device information
+ */
+const struct ionic_devinfo *ionic_api_get_devinfo(void *handle);
+
 #endif /* _IONIC_API_H_ */
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index c8c710cfe70c..afda7204b6e2 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -12,6 +12,7 @@
 
 #include "ionic_if.h"
 #include "ionic_regs.h"
+#include "ionic_api.h"
 
 #define IONIC_MAX_TX_DESC		8192
 #define IONIC_MAX_RX_DESC		16384
@@ -139,13 +140,6 @@ static_assert(sizeof(struct ionic_vf_ctrl_cmd) == 64);
 static_assert(sizeof(struct ionic_vf_ctrl_comp) == 16);
 #endif /* __CHECKER__ */
 
-struct ionic_devinfo {
-	u8 asic_type;
-	u8 asic_rev;
-	char fw_version[IONIC_DEVINFO_FWVERS_BUFLEN + 1];
-	char serial_num[IONIC_DEVINFO_SERIAL_BUFLEN + 1];
-};
-
 struct ionic_dev {
 	union ionic_dev_info_regs __iomem *dev_info_regs;
 	union ionic_dev_cmd_regs __iomem *dev_cmd_regs;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_if.h b/drivers/net/ethernet/pensando/ionic/ionic_if.h
index 830c8adbfbee..f97f5d87b2ce 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_if.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_if.h
@@ -494,6 +494,16 @@ union ionic_lif_config {
 	__le32 words[64];
 };
 
+/**
+ * enum ionic_lif_rdma_cap_stats - LIF stat type
+ * @IONIC_LIF_RDMA_STAT_GLOBAL:     Global stats
+ * @IONIC_LIF_RDMA_STAT_QP:         Queue pair stats
+ */
+enum ionic_lif_rdma_cap_stats {
+	IONIC_LIF_RDMA_STAT_GLOBAL = BIT(0),
+	IONIC_LIF_RDMA_STAT_QP = BIT(1),
+};
+
 /**
  * struct ionic_lif_identity - LIF identity information (type-specific)
  *
@@ -513,10 +523,10 @@ union ionic_lif_config {
  *	@eth.config:             LIF config struct with features, mtu, mac, q counts
  *
  * @rdma:                RDMA identify structure
- *	@rdma.version:         RDMA version of opcodes and queue descriptors
+ *	@rdma.version:         RDMA capability version
  *	@rdma.qp_opcodes:      Number of RDMA queue pair opcodes supported
  *	@rdma.admin_opcodes:   Number of RDMA admin opcodes supported
- *	@rdma.rsvd:            reserved byte(s)
+ *	@rdma.minor_version:   RDMA capability minor version
  *	@rdma.npts_per_lif:    Page table size per LIF
  *	@rdma.nmrs_per_lif:    Number of memory regions per LIF
  *	@rdma.nahs_per_lif:    Number of address handles per LIF
@@ -526,12 +536,14 @@ union ionic_lif_config {
  *	@rdma.rrq_stride:      Remote RQ work request stride
  *	@rdma.rsq_stride:      Remote SQ work request stride
  *	@rdma.dcqcn_profiles:  Number of DCQCN profiles
- *	@rdma.rsvd_dimensions: reserved byte(s)
+ *	@rdma.page_size_cap:   Supported page sizes
  *	@rdma.aq_qtype:        RDMA Admin Qtype
  *	@rdma.sq_qtype:        RDMA Send Qtype
  *	@rdma.rq_qtype:        RDMA Receive Qtype
  *	@rdma.cq_qtype:        RDMA Completion Qtype
  *	@rdma.eq_qtype:        RDMA Event Qtype
+ *	@rdma.stats_type:      Supported statistics type
+ *	                       (enum ionic_lif_rdma_cap_stats)
  * @words:               word access to struct contents
  */
 union ionic_lif_identity {
@@ -557,7 +569,7 @@ union ionic_lif_identity {
 			u8 version;
 			u8 qp_opcodes;
 			u8 admin_opcodes;
-			u8 rsvd;
+			u8 minor_version;
 			__le32 npts_per_lif;
 			__le32 nmrs_per_lif;
 			__le32 nahs_per_lif;
@@ -567,12 +579,16 @@ union ionic_lif_identity {
 			u8 rrq_stride;
 			u8 rsq_stride;
 			u8 dcqcn_profiles;
-			u8 rsvd_dimensions[10];
+			u8 udma_shift;
+			u8 rsvd_dimensions;
+			__le64 page_size_cap;
 			struct ionic_lif_logical_qtype aq_qtype;
 			struct ionic_lif_logical_qtype sq_qtype;
 			struct ionic_lif_logical_qtype rq_qtype;
 			struct ionic_lif_logical_qtype cq_qtype;
 			struct ionic_lif_logical_qtype eq_qtype;
+			__le16 stats_type;
+			u8 rsvd1[162];
 		} __packed rdma;
 	} __packed;
 	__le32 words[478];
-- 
2.34.1