summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/usnic/usnic_transport.c
blob: ddef6f77a78cf4c3fbf68a1b867a23b843fd3124 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
/*
 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
#include <linux/bitmap.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <net/inet_sock.h>

#include "usnic_transport.h"
#include "usnic_log.h"

/* ROCE */
static unsigned long *roce_bitmap;
static u16 roce_next_port = 1;
#define ROCE_BITMAP_SZ ((1 << (8 /*CHAR_BIT*/ * sizeof(u16)))/8 /*CHAR BIT*/)
static DEFINE_SPINLOCK(roce_bitmap_lock);

const char *usnic_transport_to_str(enum usnic_transport_type type)
{
	switch (type) {
	case USNIC_TRANSPORT_UNKNOWN:
		return "Unknown";
	case USNIC_TRANSPORT_ROCE_CUSTOM:
		return "roce custom";
	case USNIC_TRANSPORT_IPV4_UDP:
		return "IPv4 UDP";
	case USNIC_TRANSPORT_MAX:
		return "Max?";
	default:
		return "Not known";
	}
}

int usnic_transport_sock_to_str(char *buf, int buf_sz,
					struct socket *sock)
{
	int err;
	uint32_t addr;
	uint16_t port;
	int proto;

	memset(buf, 0, buf_sz);
	err = usnic_transport_sock_get_addr(sock, &proto, &addr, &port);
	if (err)
		return 0;

	return scnprintf(buf, buf_sz, "Proto:%u Addr:%pI4h Port:%hu",
			proto, &addr, port);
}

/*
 * reserve a port number.  if "0" specified, we will try to pick one
 * starting at roce_next_port.  roce_next_port will take on the values
 * 1..4096
 */
u16 usnic_transport_rsrv_port(enum usnic_transport_type type, u16 port_num)
{
	if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
		spin_lock(&roce_bitmap_lock);
		if (!port_num) {
			port_num = bitmap_find_next_zero_area(roce_bitmap,
						ROCE_BITMAP_SZ,
						roce_next_port /* start */,
						1 /* nr */,
						0 /* align */);
			roce_next_port = (port_num & 4095) + 1;
		} else if (test_bit(port_num, roce_bitmap)) {
			usnic_err("Failed to allocate port for %s\n",
					usnic_transport_to_str(type));
			spin_unlock(&roce_bitmap_lock);
			goto out_fail;
		}
		bitmap_set(roce_bitmap, port_num, 1);
		spin_unlock(&roce_bitmap_lock);
	} else {
		usnic_err("Failed to allocate port - transport %s unsupported\n",
				usnic_transport_to_str(type));
		goto out_fail;
	}

	usnic_dbg("Allocating port %hu for %s\n", port_num,
			usnic_transport_to_str(type));
	return port_num;

out_fail:
	return 0;
}

void usnic_transport_unrsrv_port(enum usnic_transport_type type, u16 port_num)
{
	if (type == USNIC_TRANSPORT_ROCE_CUSTOM) {
		spin_lock(&roce_bitmap_lock);
		if (!port_num) {
			usnic_err("Unreserved unvalid port num 0 for %s\n",
					usnic_transport_to_str(type));
			goto out_roce_custom;
		}

		if (!test_bit(port_num, roce_bitmap)) {
			usnic_err("Unreserving invalid %hu for %s\n",
					port_num,
					usnic_transport_to_str(type));
			goto out_roce_custom;
		}
		bitmap_clear(roce_bitmap, port_num, 1);
		usnic_dbg("Freeing port %hu for %s\n", port_num,
				usnic_transport_to_str(type));
out_roce_custom:
		spin_unlock(&roce_bitmap_lock);
	} else {
		usnic_err("Freeing invalid port %hu for %d\n", port_num, type);
	}
}

struct socket *usnic_transport_get_socket(int sock_fd)
{
	struct socket *sock;
	int err;
	char buf[25];

	/* sockfd_lookup will internally do a fget */
	sock = sockfd_lookup(sock_fd, &err);
	if (!sock) {
		usnic_err("Unable to lookup socket for fd %d with err %d\n",
				sock_fd, err);
		return ERR_PTR(-ENOENT);
	}

	usnic_transport_sock_to_str(buf, sizeof(buf), sock);
	usnic_dbg("Get sock %s\n", buf);

	return sock;
}

void usnic_transport_put_socket(struct socket *sock)
{
	char buf[100];

	usnic_transport_sock_to_str(buf, sizeof(buf), sock);
	usnic_dbg("Put sock %s\n", buf);
	sockfd_put(sock);
}

int usnic_transport_sock_get_addr(struct socket *sock, int *proto,
					uint32_t *addr, uint16_t *port)
{
	int len;
	int err;
	struct sockaddr_in sock_addr;

	err = sock->ops->getname(sock,
				(struct sockaddr *)&sock_addr,
				&len, 0);
	if (err)
		return err;

	if (sock_addr.sin_family != AF_INET)
		return -EINVAL;

	if (proto)
		*proto = sock->sk->sk_protocol;
	if (port)
		*port = ntohs(((struct sockaddr_in *)&sock_addr)->sin_port);
	if (addr)
		*addr = ntohl(((struct sockaddr_in *)
					&sock_addr)->sin_addr.s_addr);

	return 0;
}

int usnic_transport_init(void)
{
	roce_bitmap = kzalloc(ROCE_BITMAP_SZ, GFP_KERNEL);
	if (!roce_bitmap) {
		usnic_err("Failed to allocate bit map");
		return -ENOMEM;
	}

	/* Do not ever allocate bit 0, hence set it here */
	bitmap_set(roce_bitmap, 0, 1);
	return 0;
}

void usnic_transport_fini(void)
{
	kfree(roce_bitmap);
}
OpenPOWER on IntegriCloud