1 files changed, 258 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_auxr.c b/drivers/net/ethernet/broadcom/bnge/bnge_auxr.c
new file mode 100644
index 000000000000..d64592b64e17
--- /dev/null
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_auxr.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2025 Broadcom.
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/bitops.h>
+#include <linux/irq.h>
+#include <asm/byteorder.h>
+#include <linux/bitmap.h>
+#include <linux/auxiliary_bus.h>
+#include <linux/bnxt/hsi.h>
+
+#include "bnge.h"
+#include "bnge_hwrm.h"
+#include "bnge_auxr.h"
+
+static DEFINE_IDA(bnge_aux_dev_ids);
+
+static void bnge_fill_msix_vecs(struct bnge_dev *bd,
+				struct bnge_msix_info *info)
+{
+	struct bnge_auxr_dev *auxr_dev = bd->auxr_dev;
+	int num_msix, i;
+
+	if (!auxr_dev->auxr_info->msix_requested) {
+		dev_warn(bd->dev, "Requested MSI-X vectors not allocated\n");
+		return;
+	}
+	num_msix = auxr_dev->auxr_info->msix_requested;
+	for (i = 0; i < num_msix; i++) {
+		info[i].vector = bd->irq_tbl[i].vector;
+		info[i].db_offset = bd->db_offset;
+		info[i].ring_idx = i;
+	}
+}
+
+int bnge_register_dev(struct bnge_auxr_dev *auxr_dev,
+		      void *handle)
+{
+	struct bnge_dev *bd = pci_get_drvdata(auxr_dev->pdev);
+	struct bnge_auxr_info *auxr_info;
+	int rc = 0;
+
+	netdev_lock(bd->netdev);
+	mutex_lock(&auxr_dev->auxr_dev_lock);
+	if (!bd->irq_tbl) {
+		rc = -ENODEV;
+		goto exit;
+	}
+
+	if (!bnge_aux_has_enough_resources(bd)) {
+		rc = -ENOMEM;
+		goto exit;
+	}
+
+	auxr_info = auxr_dev->auxr_info;
+	auxr_info->handle = handle;
+
+	auxr_info->msix_requested = bd->aux_num_msix;
+
+	bnge_fill_msix_vecs(bd, bd->auxr_dev->msix_info);
+	auxr_dev->flags |= BNGE_ARDEV_MSIX_ALLOC;
+
+exit:
+	mutex_unlock(&auxr_dev->auxr_dev_lock);
+	netdev_unlock(bd->netdev);
+	return rc;
+}
+EXPORT_SYMBOL(bnge_register_dev);
+
+void bnge_unregister_dev(struct bnge_auxr_dev *auxr_dev)
+{
+	struct bnge_dev *bd = pci_get_drvdata(auxr_dev->pdev);
+	struct bnge_auxr_info *auxr_info;
+
+	auxr_info = auxr_dev->auxr_info;
+	netdev_lock(bd->netdev);
+	mutex_lock(&auxr_dev->auxr_dev_lock);
+	if (auxr_info->msix_requested)
+		auxr_dev->flags &= ~BNGE_ARDEV_MSIX_ALLOC;
+	auxr_info->msix_requested = 0;
+
+	mutex_unlock(&auxr_dev->auxr_dev_lock);
+	netdev_unlock(bd->netdev);
+}
+EXPORT_SYMBOL(bnge_unregister_dev);
+
+int bnge_send_msg(struct bnge_auxr_dev *auxr_dev, struct bnge_fw_msg *fw_msg)
+{
+	struct bnge_dev *bd = pci_get_drvdata(auxr_dev->pdev);
+	struct output *resp;
+	struct input *req;
+	u32 resp_len;
+	int rc;
+
+	rc = bnge_hwrm_req_init(bd, req, 0 /* don't care */);
+	if (rc)
+		return rc;
+
+	rc = bnge_hwrm_req_replace(bd, req, fw_msg->msg, fw_msg->msg_len);
+	if (rc)
+		goto drop_req;
+
+	bnge_hwrm_req_timeout(bd, req, fw_msg->timeout);
+	resp = bnge_hwrm_req_hold(bd, req);
+	rc = bnge_hwrm_req_send(bd, req);
+	resp_len = le16_to_cpu(resp->resp_len);
+	if (resp_len) {
+		if (fw_msg->resp_max_len < resp_len)
+			resp_len = fw_msg->resp_max_len;
+
+		memcpy(fw_msg->resp, resp, resp_len);
+	}
+drop_req:
+	bnge_hwrm_req_drop(bd, req);
+	return rc;
+}
+EXPORT_SYMBOL(bnge_send_msg);
+
+void bnge_rdma_aux_device_uninit(struct bnge_dev *bd)
+{
+	struct bnge_auxr_priv *aux_priv;
+	struct auxiliary_device *adev;
+
+	/* Skip if no auxiliary device init was done. */
+	if (!bd->aux_priv)
+		return;
+
+	aux_priv = bd->aux_priv;
+	adev = &aux_priv->aux_dev;
+	auxiliary_device_uninit(adev);
+}
+
+static void bnge_aux_dev_release(struct device *dev)
+{
+	struct bnge_auxr_priv *aux_priv =
+			container_of(dev, struct bnge_auxr_priv, aux_dev.dev);
+	struct bnge_dev *bd = pci_get_drvdata(aux_priv->auxr_dev->pdev);
+
+	ida_free(&bnge_aux_dev_ids, aux_priv->id);
+	kfree(aux_priv->auxr_dev->auxr_info);
+	bd->auxr_dev = NULL;
+	kfree(aux_priv->auxr_dev);
+	kfree(aux_priv);
+	bd->aux_priv = NULL;
+}
+
+void bnge_rdma_aux_device_del(struct bnge_dev *bd)
+{
+	if (!bd->auxr_dev)
+		return;
+
+	auxiliary_device_delete(&bd->aux_priv->aux_dev);
+}
+
+static void bnge_set_auxr_dev_info(struct bnge_auxr_dev *auxr_dev,
+				   struct bnge_dev *bd)
+{
+	auxr_dev->pdev = bd->pdev;
+	auxr_dev->l2_db_size = bd->db_size;
+	auxr_dev->l2_db_size_nc = bd->db_size;
+	auxr_dev->l2_db_offset = bd->db_offset;
+	mutex_init(&auxr_dev->auxr_dev_lock);
+
+	if (bd->flags & BNGE_EN_ROCE_V1)
+		auxr_dev->flags |= BNGE_ARDEV_ROCEV1_SUPP;
+	if (bd->flags & BNGE_EN_ROCE_V2)
+		auxr_dev->flags |= BNGE_ARDEV_ROCEV2_SUPP;
+
+	auxr_dev->chip_num = bd->chip_num;
+	auxr_dev->hw_ring_stats_size = bd->hw_ring_stats_size;
+	auxr_dev->pf_port_id = bd->pf.port_id;
+	auxr_dev->en_state = bd->state;
+	auxr_dev->bar0 = bd->bar0;
+}
+
+void bnge_rdma_aux_device_add(struct bnge_dev *bd)
+{
+	struct auxiliary_device *aux_dev;
+	int rc;
+
+	if (!bd->auxr_dev)
+		return;
+
+	aux_dev = &bd->aux_priv->aux_dev;
+	rc = auxiliary_device_add(aux_dev);
+	if (rc) {
+		dev_warn(bd->dev, "Failed to add auxiliary device for ROCE\n");
+		auxiliary_device_uninit(aux_dev);
+		bd->flags &= ~BNGE_EN_ROCE;
+	}
+
+	bd->auxr_dev->net = bd->netdev;
+}
+
+void bnge_rdma_aux_device_init(struct bnge_dev *bd)
+{
+	struct auxiliary_device *aux_dev;
+	struct bnge_auxr_info *auxr_info;
+	struct bnge_auxr_priv *aux_priv;
+	struct bnge_auxr_dev *auxr_dev;
+	int rc;
+
+	if (!bnge_is_roce_en(bd))
+		return;
+
+	aux_priv = kzalloc(sizeof(*aux_priv), GFP_KERNEL);
+	if (!aux_priv)
+		goto exit;
+
+	aux_priv->id = ida_alloc(&bnge_aux_dev_ids, GFP_KERNEL);
+	if (aux_priv->id < 0) {
+		dev_warn(bd->dev, "ida alloc failed for aux device\n");
+		kfree(aux_priv);
+		goto exit;
+	}
+
+	aux_dev = &aux_priv->aux_dev;
+	aux_dev->id = aux_priv->id;
+	aux_dev->name = "rdma";
+	aux_dev->dev.parent = &bd->pdev->dev;
+	aux_dev->dev.release = bnge_aux_dev_release;
+
+	rc = auxiliary_device_init(aux_dev);
+	if (rc) {
+		ida_free(&bnge_aux_dev_ids, aux_priv->id);
+		kfree(aux_priv);
+		goto exit;
+	}
+	bd->aux_priv = aux_priv;
+
+	auxr_dev = kzalloc(sizeof(*auxr_dev), GFP_KERNEL);
+	if (!auxr_dev)
+		goto aux_dev_uninit;
+
+	aux_priv->auxr_dev = auxr_dev;
+
+	auxr_info = kzalloc(sizeof(*auxr_info), GFP_KERNEL);
+	if (!auxr_info)
+		goto aux_dev_uninit;
+
+	auxr_dev->auxr_info = auxr_info;
+	bd->auxr_dev = auxr_dev;
+	bnge_set_auxr_dev_info(auxr_dev, bd);
+
+	return;
+
+aux_dev_uninit:
+	auxiliary_device_uninit(aux_dev);
+exit:
+	bd->flags &= ~BNGE_EN_ROCE;
+}