drivers/infiniband/hw/usnic/usnic_transport.c

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33 #include <linux/bitmap.h>
  34 #include <linux/file.h>
  35 #include <linux/module.h>
  36 #include <linux/slab.h>
  37 #include <net/inet_sock.h>
  38
  39 #include "usnic_transport.h"
  40 #include "usnic_log.h"
  41
  42 /* ROCE */
  43 static unsigned long *roce_bitmap;
  44 static u16 roce_next_port = 1;
  45 #define ROCE_BITMAP_SZ ((1 << (8 /*CHAR_BIT*/ * sizeof(u16)))/8 /*CHAR BIT*/)
  46 static DEFINE_SPINLOCK(roce_bitmap_lock);
  47
  48 const char *usnic_transport_to_str(enum usnic_transport_type type)
  49 {
  50         switch (type) {
  51         case USNIC_TRANSPORT_UNKNOWN:
  52                 return "Unknown";
  53         case USNIC_TRANSPORT_ROCE_CUSTOM:
  54                 return "roce custom";
  55         case USNIC_TRANSPORT_IPV4_UDP:
  56                 return "IPv4 UDP";
  57         case USNIC_TRANSPORT_MAX:
  58                 return "Max?";
  59         default:
  60                 return "Not known";
  61         }
  62 }
  63
  64 int usnic_transport_sock_to_str(char *buf, int buf_sz,
  65                                         struct socket *sock)
  66 {
  67         int err;
  68         uint32_t addr;
  69         uint16_t port;
  70         int proto;
  71
  72         memset(buf, 0, buf_sz);
  73         err = usnic_transport_sock_get_addr(sock, &proto, &addr, &port);
  74         if (err)
  75                 return 0;
  76
  77         return scnprintf(buf, buf_sz, "Proto:%u Addr:%pI4h Port:%hu",
  78                         proto, &addr, port);
  79 }
  80
  81 /*
  82  * reserve a port number.  if "0" specified, we will try to pick one
  83  * starting at roce_next_port.  roce_next_port will take on the values
  84  * 1..4096
  85  */
  86 u16 usnic_transport_rsrv_port(enum usnic_transport_type type, u16 port_num)
  87 {
  88         if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
  89                 spin_lock(&roce_bitmap_lock);
  90                 if (!port_num) {
  91                         port_num = bitmap_find_next_zero_area(roce_bitmap,
  92                                                 ROCE_BITMAP_SZ,
  93                                                 roce_next_port /* start */,
  94                                                 1 /* nr */,
  95                                                 0 /* align */);
  96                         roce_next_port = (port_num & 4095) + 1;
  97                 } else if (test_bit(port_num, roce_bitmap)) {
  98                         usnic_err("Failed to allocate port for %s\n",
  99                                         usnic_transport_to_str(type));
 100                         spin_unlock(&roce_bitmap_lock);
 101                         goto out_fail;
 102                 }
 103                 bitmap_set(roce_bitmap, port_num, 1);
 104                 spin_unlock(&roce_bitmap_lock);
 105         } else {
 106                 usnic_err("Failed to allocate port - transport %s unsupported\n",
 107                                 usnic_transport_to_str(type));
 108                 goto out_fail;
 109         }
 110
 111         usnic_dbg("Allocating port %hu for %s\n", port_num,
 112                         usnic_transport_to_str(type));
 113         return port_num;
 114
 115 out_fail:
 116         return 0;
 117 }
 118
 119 void usnic_transport_unrsrv_port(enum usnic_transport_type type, u16 port_num)
 120 {
 121         if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
 122                 spin_lock(&roce_bitmap_lock);
 123                 if (!port_num) {
 124                         usnic_err("Unreserved invalid port num 0 for %s\n",
 125                                         usnic_transport_to_str(type));
 126                         goto out_roce_custom;
 127                 }
 128
 129                 if (!test_bit(port_num, roce_bitmap)) {
 130                         usnic_err("Unreserving invalid %hu for %s\n",
 131                                         port_num,
 132                                         usnic_transport_to_str(type));
 133                         goto out_roce_custom;
 134                 }
 135                 bitmap_clear(roce_bitmap, port_num, 1);
 136                 usnic_dbg("Freeing port %hu for %s\n", port_num,
 137                                 usnic_transport_to_str(type));
 138 out_roce_custom:
 139                 spin_unlock(&roce_bitmap_lock);
 140         } else {
 141                 usnic_err("Freeing invalid port %hu for %d\n", port_num, type);
 142         }
 143 }
 144
 145 struct socket *usnic_transport_get_socket(int sock_fd)
 146 {
 147         struct socket *sock;
 148         int err;
 149         char buf[25];
 150
 151         /* sockfd_lookup will internally do a fget */
 152         sock = sockfd_lookup(sock_fd, &err);
 153         if (!sock) {
 154                 usnic_err("Unable to lookup socket for fd %d with err %d\n",
 155                                 sock_fd, err);
 156                 return ERR_PTR(-ENOENT);
 157         }
 158
 159         usnic_transport_sock_to_str(buf, sizeof(buf), sock);
 160         usnic_dbg("Get sock %s\n", buf);
 161
 162         return sock;
 163 }
 164
 165 void usnic_transport_put_socket(struct socket *sock)
 166 {
 167         char buf[100];
 168
 169         usnic_transport_sock_to_str(buf, sizeof(buf), sock);
 170         usnic_dbg("Put sock %s\n", buf);
 171         sockfd_put(sock);
 172 }
 173
 174 int usnic_transport_sock_get_addr(struct socket *sock, int *proto,
 175                                         uint32_t *addr, uint16_t *port)
 176 {
 177         int err;
 178         struct sockaddr_in sock_addr;
 179
 180         err = sock->ops->getname(sock,
 181                                 (struct sockaddr *)&sock_addr,
 182                                 0);
 183         if (err < 0)
 184                 return err;
 185
 186         if (sock_addr.sin_family != AF_INET)
 187                 return -EINVAL;
 188
 189         if (proto)
 190                 *proto = sock->sk->sk_protocol;
 191         if (port)
 192                 *port = ntohs(((struct sockaddr_in *)&sock_addr)->sin_port);
 193         if (addr)
 194                 *addr = ntohl(((struct sockaddr_in *)
 195                                         &sock_addr)->sin_addr.s_addr);
 196
 197         return 0;
 198 }
 199
 200 int usnic_transport_init(void)
 201 {
 202         roce_bitmap = kzalloc(ROCE_BITMAP_SZ, GFP_KERNEL);
 203         if (!roce_bitmap)
 204                 return -ENOMEM;
 205
 206         /* Do not ever allocate bit 0, hence set it here */
 207         bitmap_set(roce_bitmap, 0, 1);
 208         return 0;
 209 }
 210
 211 void usnic_transport_fini(void)
 212 {
 213         kfree(roce_bitmap);
 214 }