root/drivers/infiniband/sw/rxe/rxe_sysfs.c

DEFINITIONS

1. sanitize_arg
2. rxe_param_set_add
3. rxe_param_set_remove

   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 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 
  90 err:
  91         dev_put(ndev);
  92         return err;
  93 }
  94 
  95 static 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 
 124 static const struct kernel_param_ops rxe_add_ops = {
 125         .set = rxe_param_set_add,
 126 };
 127 
 128 static const struct kernel_param_ops rxe_remove_ops = {
 129         .set = rxe_param_set_remove,
 130 };
 131 
 132 module_param_cb(add, &rxe_add_ops, NULL, 0200);
 133 MODULE_PARM_DESC(add, "DEPRECATED.  Create RXE device over network interface");
 134 module_param_cb(remove, &rxe_remove_ops, NULL, 0200);
 135 MODULE_PARM_DESC(remove, "DEPRECATED.  Remove RXE device over network interface");