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

Abhijit Gangurde
2025-04-23T10:30:47Z

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