drivers/infiniband/hw/usnic/usnic_transport.c

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