drivers/infiniband/sw/rxe/rxe_sysfs.c

   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. */
  38 static 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
  56 static 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 */
  68 out:
  69         return;
  70 }
  71
  72 static 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);
 109 err:
 110         if (ndev)
 111                 dev_put(ndev);
 112         return err;
 113 }
 114
 115 static 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
 146 static const struct kernel_param_ops rxe_add_ops = {
 147         .set = rxe_param_set_add,
 148 };
 149
 150 static const struct kernel_param_ops rxe_remove_ops = {
 151         .set = rxe_param_set_remove,
 152 };
 153
 154 module_param_cb(add, &rxe_add_ops, NULL, 0200);
 155 MODULE_PARM_DESC(add, "Create RXE device over network interface");
 156 module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
 157 MODULE_PARM_DESC(remove, "Remove RXE device over network interface");