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1 | /* | |
2 | * utils.c RDMA tool | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Leon Romanovsky <leonro@mellanox.com> | |
10 | */ | |
11 | ||
12 | #include "rdma.h" | |
13 | ||
14 | static int rd_argc(struct rd *rd) | |
15 | { | |
16 | return rd->argc; | |
17 | } | |
18 | ||
19 | static char *rd_argv(struct rd *rd) | |
20 | { | |
21 | if (!rd_argc(rd)) | |
22 | return NULL; | |
23 | return *rd->argv; | |
24 | } | |
25 | ||
26 | static int strcmpx(const char *str1, const char *str2) | |
27 | { | |
28 | if (strlen(str1) > strlen(str2)) | |
29 | return -1; | |
30 | return strncmp(str1, str2, strlen(str1)); | |
31 | } | |
32 | ||
33 | static bool rd_argv_match(struct rd *rd, const char *pattern) | |
34 | { | |
35 | if (!rd_argc(rd)) | |
36 | return false; | |
37 | return strcmpx(rd_argv(rd), pattern) == 0; | |
38 | } | |
39 | ||
40 | void rd_arg_inc(struct rd *rd) | |
41 | { | |
42 | if (!rd_argc(rd)) | |
43 | return; | |
44 | rd->argc--; | |
45 | rd->argv++; | |
46 | } | |
47 | ||
48 | bool rd_no_arg(struct rd *rd) | |
49 | { | |
50 | return rd_argc(rd) == 0; | |
51 | } | |
52 | ||
53 | static struct dev_map *dev_map_alloc(const char *dev_name) | |
54 | { | |
55 | struct dev_map *dev_map; | |
56 | ||
57 | dev_map = calloc(1, sizeof(*dev_map)); | |
58 | if (!dev_map) | |
59 | return NULL; | |
60 | dev_map->dev_name = strdup(dev_name); | |
61 | ||
62 | return dev_map; | |
63 | } | |
64 | ||
65 | static void dev_map_free(struct dev_map *dev_map) | |
66 | { | |
67 | if (!dev_map) | |
68 | return; | |
69 | ||
70 | free(dev_map->dev_name); | |
71 | free(dev_map); | |
72 | } | |
73 | ||
74 | static void dev_map_cleanup(struct rd *rd) | |
75 | { | |
76 | struct dev_map *dev_map, *tmp; | |
77 | ||
78 | list_for_each_entry_safe(dev_map, tmp, | |
79 | &rd->dev_map_list, list) { | |
80 | list_del(&dev_map->list); | |
81 | dev_map_free(dev_map); | |
82 | } | |
83 | } | |
84 | ||
85 | static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = { | |
86 | [RDMA_NLDEV_ATTR_DEV_NAME] = MNL_TYPE_NUL_STRING, | |
87 | [RDMA_NLDEV_ATTR_PORT_INDEX] = MNL_TYPE_U32, | |
88 | }; | |
89 | ||
90 | int rd_attr_cb(const struct nlattr *attr, void *data) | |
91 | { | |
92 | const struct nlattr **tb = data; | |
93 | int type; | |
94 | ||
95 | if (mnl_attr_type_valid(attr, RDMA_NLDEV_ATTR_MAX) < 0) | |
96 | return MNL_CB_ERROR; | |
97 | ||
98 | type = mnl_attr_get_type(attr); | |
99 | ||
100 | if (mnl_attr_validate(attr, nldev_policy[type]) < 0) | |
101 | return MNL_CB_ERROR; | |
102 | ||
103 | tb[type] = attr; | |
104 | return MNL_CB_OK; | |
105 | } | |
106 | ||
107 | int rd_dev_init_cb(const struct nlmsghdr *nlh, void *data) | |
108 | { | |
109 | struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {}; | |
110 | struct dev_map *dev_map; | |
111 | struct rd *rd = data; | |
112 | const char *dev_name; | |
113 | ||
114 | mnl_attr_parse(nlh, 0, rd_attr_cb, tb); | |
115 | if (!tb[RDMA_NLDEV_ATTR_DEV_NAME] || !tb[RDMA_NLDEV_ATTR_DEV_INDEX]) | |
116 | return MNL_CB_ERROR; | |
117 | if (!tb[RDMA_NLDEV_ATTR_PORT_INDEX]) { | |
118 | pr_err("This tool doesn't support switches yet\n"); | |
119 | return MNL_CB_ERROR; | |
120 | } | |
121 | ||
122 | dev_name = mnl_attr_get_str(tb[RDMA_NLDEV_ATTR_DEV_NAME]); | |
123 | ||
124 | dev_map = dev_map_alloc(dev_name); | |
125 | if (!dev_map) | |
126 | /* The main function will cleanup the allocations */ | |
127 | return MNL_CB_ERROR; | |
128 | list_add_tail(&dev_map->list, &rd->dev_map_list); | |
129 | ||
130 | dev_map->num_ports = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]); | |
131 | dev_map->idx = mnl_attr_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); | |
132 | return MNL_CB_OK; | |
133 | } | |
134 | ||
135 | void rd_free_devmap(struct rd *rd) | |
136 | { | |
137 | if (!rd) | |
138 | return; | |
139 | dev_map_cleanup(rd); | |
140 | } | |
141 | ||
142 | int rd_exec_cmd(struct rd *rd, const struct rd_cmd *cmds, const char *str) | |
143 | { | |
144 | const struct rd_cmd *c; | |
145 | ||
146 | /* First argument in objs table is default variant */ | |
147 | if (rd_no_arg(rd)) | |
148 | return cmds->func(rd); | |
149 | ||
150 | for (c = cmds + 1; c->cmd; ++c) { | |
151 | if (rd_argv_match(rd, c->cmd)) { | |
152 | /* Move to next argument */ | |
153 | rd_arg_inc(rd); | |
154 | return c->func(rd); | |
155 | } | |
156 | } | |
157 | ||
158 | pr_err("Unknown %s '%s'.\n", str, rd_argv(rd)); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | void rd_prepare_msg(struct rd *rd, uint32_t cmd, uint32_t *seq, uint16_t flags) | |
163 | { | |
164 | *seq = time(NULL); | |
165 | ||
166 | rd->nlh = mnl_nlmsg_put_header(rd->buff); | |
167 | rd->nlh->nlmsg_type = RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, cmd); | |
168 | rd->nlh->nlmsg_seq = *seq; | |
169 | rd->nlh->nlmsg_flags = flags; | |
170 | } | |
171 | ||
172 | int rd_send_msg(struct rd *rd) | |
173 | { | |
174 | int ret; | |
175 | ||
176 | rd->nl = mnl_socket_open(NETLINK_RDMA); | |
177 | if (!rd->nl) { | |
178 | pr_err("Failed to open NETLINK_RDMA socket\n"); | |
179 | return -ENODEV; | |
180 | } | |
181 | ||
182 | ret = mnl_socket_bind(rd->nl, 0, MNL_SOCKET_AUTOPID); | |
183 | if (ret < 0) { | |
184 | pr_err("Failed to bind socket with err %d\n", ret); | |
185 | goto err; | |
186 | } | |
187 | ||
188 | ret = mnl_socket_sendto(rd->nl, rd->nlh, rd->nlh->nlmsg_len); | |
189 | if (ret < 0) { | |
190 | pr_err("Failed to send to socket with err %d\n", ret); | |
191 | goto err; | |
192 | } | |
193 | return 0; | |
194 | ||
195 | err: | |
196 | mnl_socket_close(rd->nl); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | int rd_recv_msg(struct rd *rd, mnl_cb_t callback, void *data, unsigned int seq) | |
201 | { | |
202 | int ret; | |
203 | unsigned int portid; | |
204 | char buf[MNL_SOCKET_BUFFER_SIZE]; | |
205 | ||
206 | portid = mnl_socket_get_portid(rd->nl); | |
207 | do { | |
208 | ret = mnl_socket_recvfrom(rd->nl, buf, sizeof(buf)); | |
209 | if (ret <= 0) | |
210 | break; | |
211 | ||
212 | ret = mnl_cb_run(buf, ret, seq, portid, callback, data); | |
213 | } while (ret > 0); | |
214 | ||
215 | mnl_socket_close(rd->nl); | |
216 | return ret; | |
217 | } |