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
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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/slab.h>
36 #include <net/inet_sock.h>
38 #include "usnic_transport.h"
39 #include "usnic_log.h"
42 static unsigned long *roce_bitmap;
43 static u16 roce_next_port = 1;
44 #define ROCE_BITMAP_SZ ((1 << (8 /*CHAR_BIT*/ * sizeof(u16)))/8 /*CHAR BIT*/)
45 static DEFINE_SPINLOCK(roce_bitmap_lock);
47 const char *usnic_transport_to_str(enum usnic_transport_type type)
50 case USNIC_TRANSPORT_UNKNOWN:
52 case USNIC_TRANSPORT_ROCE_CUSTOM:
54 case USNIC_TRANSPORT_IPV4_UDP:
56 case USNIC_TRANSPORT_MAX:
63 int usnic_transport_sock_to_str(char *buf, int buf_sz,
71 memset(buf, 0, buf_sz);
72 err = usnic_transport_sock_get_addr(sock, &proto, &addr, &port);
76 return scnprintf(buf, buf_sz, "Proto:%u Addr:%pI4h Port:%hu",
81 * reserve a port number. if "0" specified, we will try to pick one
82 * starting at roce_next_port. roce_next_port will take on the values
85 u16 usnic_transport_rsrv_port(enum usnic_transport_type type, u16 port_num)
87 if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
88 spin_lock(&roce_bitmap_lock);
90 port_num = bitmap_find_next_zero_area(roce_bitmap,
92 roce_next_port /* start */,
95 roce_next_port = (port_num & 4095) + 1;
96 } else if (test_bit(port_num, roce_bitmap)) {
97 usnic_err("Failed to allocate port for %s\n",
98 usnic_transport_to_str(type));
99 spin_unlock(&roce_bitmap_lock);
102 bitmap_set(roce_bitmap, port_num, 1);
103 spin_unlock(&roce_bitmap_lock);
105 usnic_err("Failed to allocate port - transport %s unsupported\n",
106 usnic_transport_to_str(type));
110 usnic_dbg("Allocating port %hu for %s\n", port_num,
111 usnic_transport_to_str(type));
118 void usnic_transport_unrsrv_port(enum usnic_transport_type type, u16 port_num)
120 if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
121 spin_lock(&roce_bitmap_lock);
123 usnic_err("Unreserved invalid port num 0 for %s\n",
124 usnic_transport_to_str(type));
125 goto out_roce_custom;
128 if (!test_bit(port_num, roce_bitmap)) {
129 usnic_err("Unreserving invalid %hu for %s\n",
131 usnic_transport_to_str(type));
132 goto out_roce_custom;
134 bitmap_clear(roce_bitmap, port_num, 1);
135 usnic_dbg("Freeing port %hu for %s\n", port_num,
136 usnic_transport_to_str(type));
138 spin_unlock(&roce_bitmap_lock);
140 usnic_err("Freeing invalid port %hu for %d\n", port_num, type);
144 struct socket *usnic_transport_get_socket(int sock_fd)
150 /* sockfd_lookup will internally do a fget */
151 sock = sockfd_lookup(sock_fd, &err);
153 usnic_err("Unable to lookup socket for fd %d with err %d\n",
155 return ERR_PTR(-ENOENT);
158 usnic_transport_sock_to_str(buf, sizeof(buf), sock);
159 usnic_dbg("Get sock %s\n", buf);
164 void usnic_transport_put_socket(struct socket *sock)
168 usnic_transport_sock_to_str(buf, sizeof(buf), sock);
169 usnic_dbg("Put sock %s\n", buf);
173 int usnic_transport_sock_get_addr(struct socket *sock, int *proto,
174 uint32_t *addr, uint16_t *port)
177 struct sockaddr_in sock_addr;
179 err = sock->ops->getname(sock,
180 (struct sockaddr *)&sock_addr,
185 if (sock_addr.sin_family != AF_INET)
189 *proto = sock->sk->sk_protocol;
191 *port = ntohs(((struct sockaddr_in *)&sock_addr)->sin_port);
193 *addr = ntohl(((struct sockaddr_in *)
194 &sock_addr)->sin_addr.s_addr);
199 int usnic_transport_init(void)
201 roce_bitmap = kzalloc(ROCE_BITMAP_SZ, GFP_KERNEL);
205 /* Do not ever allocate bit 0, hence set it here */
206 bitmap_set(roce_bitmap, 0, 1);
210 void usnic_transport_fini(void)