LXR linux/drivers/infiniband/sw/rxe/rxe

   1/*
   2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   4 *
   5 * This software is available to you under a choice of one of two
   6 * licenses.  You may choose to be licensed under the terms of the GNU
   7 * General Public License (GPL) Version 2, available from the file
   8 * COPYING in the main directory of this source tree, or the
   9 * OpenIB.org BSD license below:
  10 *
  11 *     Redistribution and use in source and binary forms, with or
  12 *     without modification, are permitted provided that the following
  13 *     conditions are met:
  14 *
  15 *      - Redistributions of source code must retain the above
  16 *        copyright notice, this list of conditions and the following
  17 *        disclaimer.
  18 *
  19 *      - Redistributions in binary form must reproduce the above
  20 *        copyright notice, this list of conditions and the following
  21 *        disclaimer in the documentation and/or other materials
  22 *        provided with the distribution.
  23 *
  24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31 * SOFTWARE.
  32 */
  33
  34#include "rxe.h"
  35#include "rxe_net.h"
  36
  37/* Copy argument and remove trailing CR. Return the new length. */
  38static int sanitize_arg(const char *val, char *intf, int intf_len)
  39{
  40        int len;
  41
  42        if (!val)
  43                return 0;
  44
  45        /* Remove newline. */
  46        for (len = 0; len < intf_len - 1 && val[len] && val[len] != '\n'; len++)
  47                intf[len] = val[len];
  48        intf[len] = 0;
  49
  50        if (len == 0 || (val[len] != 0 && val[len] != '\n'))
  51                return 0;
  52
  53        return len;
  54}
  55
  56static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
  57{
  58        int len;
  59        int err = 0;
  60        char intf[32];
  61        struct net_device *ndev;
  62        struct rxe_dev *exists;
  63
  64        len = sanitize_arg(val, intf, sizeof(intf));
  65        if (!len) {
  66                pr_err("add: invalid interface name\n");
  67                return -EINVAL;
  68        }
  69
  70        ndev = dev_get_by_name(&init_net, intf);
  71        if (!ndev) {
  72                pr_err("interface %s not found\n", intf);
  73                return -EINVAL;
  74        }
  75
  76        exists = rxe_get_dev_from_net(ndev);
  77        if (exists) {
  78                ib_device_put(&exists->ib_dev);
  79                pr_err("already configured on %s\n", intf);
  80                err = -EINVAL;
  81                goto err;
  82        }
  83
  84        err = rxe_net_add("rxe%d", ndev);
  85        if (err) {
  86                pr_err("failed to add %s\n", intf);
  87                goto err;
  88        }
  89
  90err:
  91        dev_put(ndev);
  92        return err;
  93}
  94
  95static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
  96{
  97        int len;
  98        char intf[32];
  99        struct ib_device *ib_dev;
 100
 101        len = sanitize_arg(val, intf, sizeof(intf));
 102        if (!len) {
 103                pr_err("add: invalid interface name\n");
 104                return -EINVAL;
 105        }
 106
 107        if (strncmp("all", intf, len) == 0) {
 108                pr_info("rxe_sys: remove all");
 109                ib_unregister_driver(RDMA_DRIVER_RXE);
 110                return 0;
 111        }
 112
 113        ib_dev = ib_device_get_by_name(intf, RDMA_DRIVER_RXE);
 114        if (!ib_dev) {
 115                pr_err("not configured on %s\n", intf);
 116                return -EINVAL;
 117        }
 118
 119        ib_unregister_device_and_put(ib_dev);
 120
 121        return 0;
 122}
 123
 124static const struct kernel_param_ops rxe_add_ops = {
 125        .set = rxe_param_set_add,
 126};
 127
 128static const struct kernel_param_ops rxe_remove_ops = {
 129        .set = rxe_param_set_remove,
 130};
 131
 132module_param_cb(add, &rxe_add_ops, NULL, 0200);
 133MODULE_PARM_DESC(add, "DEPRECATED.  Create RXE device over network interface");
 134module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
 135MODULE_PARM_DESC(remove, "DEPRECATED.  Remove RXE device over network interface");
 136