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 void rxe_set_port_state(struct net_device *ndev)
  57{
  58        struct rxe_dev *rxe = net_to_rxe(ndev);
  59        bool is_up = netif_running(ndev) && netif_carrier_ok(ndev);
  60
  61        if (!rxe)
  62                goto out;
  63
  64        if (is_up)
  65                rxe_port_up(rxe);
  66        else
  67                rxe_port_down(rxe); /* down for unknown state */
  68out:
  69        return;
  70}
  71
  72static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
  73{
  74        int len;
  75        int err = 0;
  76        char intf[32];
  77        struct net_device *ndev = NULL;
  78        struct rxe_dev *rxe;
  79
  80        len = sanitize_arg(val, intf, sizeof(intf));
  81        if (!len) {
  82                pr_err("add: invalid interface name\n");
  83                err = -EINVAL;
  84                goto err;
  85        }
  86
  87        ndev = dev_get_by_name(&init_net, intf);
  88        if (!ndev) {
  89                pr_err("interface %s not found\n", intf);
  90                err = -EINVAL;
  91                goto err;
  92        }
  93
  94        if (net_to_rxe(ndev)) {
  95                pr_err("already configured on %s\n", intf);
  96                err = -EINVAL;
  97                goto err;
  98        }
  99
 100        rxe = rxe_net_add(ndev);
 101        if (!rxe) {
 102                pr_err("failed to add %s\n", intf);
 103                err = -EINVAL;
 104                goto err;
 105        }
 106
 107        rxe_set_port_state(ndev);
 108        pr_info("added %s to %s\n", rxe->ib_dev.name, intf);
 109err:
 110        if (ndev)
 111                dev_put(ndev);
 112        return err;
 113}
 114
 115static int rxe_param_set_remove(const char *val, const struct kernel_param *kp)
 116{
 117        int len;
 118        char intf[32];
 119        struct rxe_dev *rxe;
 120
 121        len = sanitize_arg(val, intf, sizeof(intf));
 122        if (!len) {
 123                pr_err("add: invalid interface name\n");
 124                return -EINVAL;
 125        }
 126
 127        if (strncmp("all", intf, len) == 0) {
 128                pr_info("rxe_sys: remove all");
 129                rxe_remove_all();
 130                return 0;
 131        }
 132
 133        rxe = get_rxe_by_name(intf);
 134
 135        if (!rxe) {
 136                pr_err("not configured on %s\n", intf);
 137                return -EINVAL;
 138        }
 139
 140        list_del(&rxe->list);
 141        rxe_remove(rxe);
 142
 143        return 0;
 144}
 145
 146static const struct kernel_param_ops rxe_add_ops = {
 147        .set = rxe_param_set_add,
 148};
 149
 150static const struct kernel_param_ops rxe_remove_ops = {
 151        .set = rxe_param_set_remove,
 152};
 153
 154module_param_cb(add, &rxe_add_ops, NULL, 0200);
 155MODULE_PARM_DESC(add, "Create RXE device over network interface");
 156module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
 157MODULE_PARM_DESC(remove, "Remove RXE device over network interface");
 158