2 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
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
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
39 #include "usnic_transport.h"
40 #include "usnic_log.h"
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);
48 const char *usnic_transport_to_str(enum usnic_transport_type type)
51 case USNIC_TRANSPORT_UNKNOWN:
53 case USNIC_TRANSPORT_ROCE_CUSTOM:
55 case USNIC_TRANSPORT_IPV4_UDP:
57 case USNIC_TRANSPORT_MAX:
64 int usnic_transport_sock_to_str(char *buf, int buf_sz,
72 memset(buf, 0, buf_sz);
73 err = usnic_transport_sock_get_addr(sock, &proto, &addr, &port);
77 return scnprintf(buf, buf_sz, "Proto:%u Addr:%pI4h Port:%hu",
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
86 u16 usnic_transport_rsrv_port(enum usnic_transport_type type, u16 port_num)
88 if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
89 spin_lock(&roce_bitmap_lock);
91 port_num = bitmap_find_next_zero_area(roce_bitmap,
93 roce_next_port /* start */,
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);
103 bitmap_set(roce_bitmap, port_num, 1);
104 spin_unlock(&roce_bitmap_lock);
106 usnic_err("Failed to allocate port - transport %s unsupported\n",
107 usnic_transport_to_str(type));
111 usnic_dbg("Allocating port %hu for %s\n", port_num,
112 usnic_transport_to_str(type));
119 void usnic_transport_unrsrv_port(enum usnic_transport_type type, u16 port_num)
121 if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
122 spin_lock(&roce_bitmap_lock);
124 usnic_err("Unreserved unvalid port num 0 for %s\n",
125 usnic_transport_to_str(type));
126 goto out_roce_custom;
129 if (!test_bit(port_num, roce_bitmap)) {
130 usnic_err("Unreserving invalid %hu for %s\n",
132 usnic_transport_to_str(type));
133 goto out_roce_custom;
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));
139 spin_unlock(&roce_bitmap_lock);
141 usnic_err("Freeing invalid port %hu for %d\n", port_num, type);
145 struct socket *usnic_transport_get_socket(int sock_fd)
151 /* sockfd_lookup will internally do a fget */
152 sock = sockfd_lookup(sock_fd, &err);
154 usnic_err("Unable to lookup socket for fd %d with err %d\n",
156 return ERR_PTR(-ENOENT);
159 usnic_transport_sock_to_str(buf, sizeof(buf), sock);
160 usnic_dbg("Get sock %s\n", buf);
165 void usnic_transport_put_socket(struct socket *sock)
169 usnic_transport_sock_to_str(buf, sizeof(buf), sock);
170 usnic_dbg("Put sock %s\n", buf);
174 int usnic_transport_sock_get_addr(struct socket *sock, int *proto,
175 uint32_t *addr, uint16_t *port)
179 struct sockaddr_in sock_addr;
181 err = sock->ops->getname(sock,
182 (struct sockaddr *)&sock_addr,
187 if (sock_addr.sin_family != AF_INET)
191 *proto = sock->sk->sk_protocol;
193 *port = ntohs(((struct sockaddr_in *)&sock_addr)->sin_port);
195 *addr = ntohl(((struct sockaddr_in *)
196 &sock_addr)->sin_addr.s_addr);
201 int usnic_transport_init(void)
203 roce_bitmap = kzalloc(ROCE_BITMAP_SZ, GFP_KERNEL);
205 usnic_err("Failed to allocate bit map");
209 /* Do not ever allocate bit 0, hence set it here */
210 bitmap_set(roce_bitmap, 0, 1);
214 void usnic_transport_fini(void)