From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/infiniband/sw/rxe/rxe_sysfs.c | 119 ++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 drivers/infiniband/sw/rxe/rxe_sysfs.c

(limited to 'drivers/infiniband/sw/rxe/rxe_sysfs.c')

diff --git a/drivers/infiniband/sw/rxe/rxe_sysfs.c b/drivers/infiniband/sw/rxe/rxe_sysfs.c
new file mode 100644
index 000000000..666202ddf
--- /dev/null
+++ b/drivers/infiniband/sw/rxe/rxe_sysfs.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ */
+
+#include "rxe.h"
+#include "rxe_net.h"
+
+/* Copy argument and remove trailing CR. Return the new length. */
+static int sanitize_arg(const char *val, char *intf, int intf_len)
+{
+	int len;
+
+	if (!val)
+		return 0;
+
+	/* Remove newline. */
+	for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
+		intf[len] = val[len];
+	intf[len] = 0;
+
+	if (len == 0 || (val[len] != 0 && val[len] != '\n'))
+		return 0;
+
+	return len;
+}
+
+static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
+{
+	int len;
+	int err = 0;
+	char intf[32];
+	struct net_device *ndev;
+	struct rxe_dev *exists;
+
+	if (!rxe_initialized) {
+		pr_err("Module parameters are not supported, use rdma link add or rxe_cfg\n");
+		return -EAGAIN;
+	}
+
+	len = sanitize_arg(val, intf, sizeof(intf));
+	if (!len) {
+		pr_err("add: invalid interface name\n");
+		return -EINVAL;
+	}
+
+	ndev = dev_get_by_name(&init_net, intf);
+	if (!ndev) {
+		pr_err("interface %s not found\n", intf);
+		return -EINVAL;
+	}
+
+	if (is_vlan_dev(ndev)) {
+		pr_err("rxe creation allowed on top of a real device only\n");
+		err = -EPERM;
+		goto err;
+	}
+
+	exists = rxe_get_dev_from_net(ndev);
+	if (exists) {
+		ib_device_put(&exists->ib_dev);
+		pr_err("already configured on %s\n", intf);
+		err = -EINVAL;
+		goto err;
+	}
+
+	err = rxe_net_add("rxe%d", ndev);
+	if (err) {
+		pr_err("failed to add %s\n", intf);
+		goto err;
+	}
+
+err:
+	dev_put(ndev);
+	return err;
+}
+
+static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
+{
+	int len;
+	char intf[32];
+	struct ib_device *ib_dev;
+
+	len = sanitize_arg(val, intf, sizeof(intf));
+	if (!len) {
+		pr_err("add: invalid interface name\n");
+		return -EINVAL;
+	}
+
+	if (strncmp("all", intf, len) == 0) {
+		pr_info("rxe_sys: remove all");
+		ib_unregister_driver(RDMA_DRIVER_RXE);
+		return 0;
+	}
+
+	ib_dev = ib_device_get_by_name(intf, RDMA_DRIVER_RXE);
+	if (!ib_dev) {
+		pr_err("not configured on %s\n", intf);
+		return -EINVAL;
+	}
+
+	ib_unregister_device_and_put(ib_dev);
+
+	return 0;
+}
+
+static const struct kernel_param_ops rxe_add_ops = {
+	.set = rxe_param_set_add,
+};
+
+static const struct kernel_param_ops rxe_remove_ops = {
+	.set = rxe_param_set_remove,
+};
+
+module_param_cb(add, &rxe_add_ops, NULL, 0200);
+MODULE_PARM_DESC(add, "DEPRECATED.  Create RXE device over network interface");
+module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
+MODULE_PARM_DESC(remove, "DEPRECATED.  Remove RXE device over network interface");
-- 
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