1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_aux.c b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
new file mode 100644
index 000000000000..a2be338eb3e5
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_aux.c
@@ -0,0 +1,102 @@
+// 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"
+#include "ionic_aux.h"
+
+static DEFINE_IDA(aux_ida);
+
+static void ionic_auxbus_release(struct device *dev)
+{
+	struct ionic_aux_dev *ionic_adev;
+
+	ionic_adev = container_of(dev, struct ionic_aux_dev, adev.dev);
+	ida_free(&aux_ida, ionic_adev->adev.id);
+	kfree(ionic_adev);
+}
+
+int ionic_auxbus_register(struct ionic_lif *lif)
+{
+	struct ionic_aux_dev *ionic_adev;
+	struct auxiliary_device *aux_dev;
+	int err, id;
+
+	if (!(le64_to_cpu(lif->ionic->ident.lif.capabilities) & IONIC_LIF_CAP_RDMA))
+		return 0;
+
+	ionic_adev = kzalloc(sizeof(*ionic_adev), GFP_KERNEL);
+	if (!ionic_adev)
+		return -ENOMEM;
+
+	aux_dev = &ionic_adev->adev;
+
+	id = ida_alloc(&aux_ida, GFP_KERNEL);
+	if (id < 0) {
+		dev_err(lif->ionic->dev, "Failed to allocate aux id: %d\n", id);
+		kfree(ionic_adev);
+		return id;
+	}
+
+	aux_dev->id = id;
+	aux_dev->name = "rdma";
+	aux_dev->dev.parent = &lif->ionic->pdev->dev;
+	aux_dev->dev.release = ionic_auxbus_release;
+	ionic_adev->lif = lif;
+	err = auxiliary_device_init(aux_dev);
+	if (err) {
+		dev_err(lif->ionic->dev, "Failed to initialize %s aux device: %d\n",
+			aux_dev->name, err);
+		ida_free(&aux_ida, id);
+		kfree(ionic_adev);
+		return err;
+	}
+
+	err = auxiliary_device_add(aux_dev);
+	if (err) {
+		dev_err(lif->ionic->dev, "Failed to add %s aux device: %d\n",
+			aux_dev->name, err);
+		auxiliary_device_uninit(aux_dev);
+		return err;
+	}
+
+	lif->ionic_adev = ionic_adev;
+	return 0;
+}
+
+void ionic_auxbus_unregister(struct ionic_lif *lif)
+{
+	mutex_lock(&lif->adev_lock);
+	if (!lif->ionic_adev)
+		goto out;
+
+	auxiliary_device_delete(&lif->ionic_adev->adev);
+	auxiliary_device_uninit(&lif->ionic_adev->adev);
+
+	lif->ionic_adev = NULL;
+out:
+	mutex_unlock(&lif->adev_lock);
+}
+
+void ionic_request_rdma_reset(struct ionic_lif *lif)
+{
+	struct ionic *ionic = lif->ionic;
+	int err;
+
+	union ionic_dev_cmd cmd = {
+		.cmd.opcode = IONIC_CMD_RDMA_RESET_LIF,
+		.cmd.lif_index = cpu_to_le16(lif->index),
+	};
+
+	mutex_lock(&ionic->dev_cmd_lock);
+
+	ionic_dev_cmd_go(&ionic->idev, &cmd);
+	err = ionic_dev_cmd_wait(ionic, DEVCMD_TIMEOUT);
+
+	mutex_unlock(&ionic->dev_cmd_lock);
+
+	if (err)
+		pr_warn("%s request_reset: error %d\n", __func__, err);
+}
+EXPORT_SYMBOL_NS(ionic_request_rdma_reset, "NET_IONIC");