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Linux/net/core/devlink.c

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  1 /*
  2  * net/core/devlink.c - Network physical/parent device Netlink interface
  3  *
  4  * Heavily inspired by net/wireless/
  5  * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
  6  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/types.h>
 17 #include <linux/slab.h>
 18 #include <linux/gfp.h>
 19 #include <linux/device.h>
 20 #include <linux/list.h>
 21 #include <linux/netdevice.h>
 22 #include <rdma/ib_verbs.h>
 23 #include <net/netlink.h>
 24 #include <net/genetlink.h>
 25 #include <net/rtnetlink.h>
 26 #include <net/net_namespace.h>
 27 #include <net/sock.h>
 28 #include <net/devlink.h>
 29 #define CREATE_TRACE_POINTS
 30 #include <trace/events/devlink.h>
 31 
 32 static struct devlink_dpipe_field devlink_dpipe_fields_ethernet[] = {
 33         {
 34                 .name = "destination mac",
 35                 .id = DEVLINK_DPIPE_FIELD_ETHERNET_DST_MAC,
 36                 .bitwidth = 48,
 37         },
 38 };
 39 
 40 struct devlink_dpipe_header devlink_dpipe_header_ethernet = {
 41         .name = "ethernet",
 42         .id = DEVLINK_DPIPE_HEADER_ETHERNET,
 43         .fields = devlink_dpipe_fields_ethernet,
 44         .fields_count = ARRAY_SIZE(devlink_dpipe_fields_ethernet),
 45         .global = true,
 46 };
 47 EXPORT_SYMBOL(devlink_dpipe_header_ethernet);
 48 
 49 static struct devlink_dpipe_field devlink_dpipe_fields_ipv4[] = {
 50         {
 51                 .name = "destination ip",
 52                 .id = DEVLINK_DPIPE_FIELD_IPV4_DST_IP,
 53                 .bitwidth = 32,
 54         },
 55 };
 56 
 57 struct devlink_dpipe_header devlink_dpipe_header_ipv4 = {
 58         .name = "ipv4",
 59         .id = DEVLINK_DPIPE_HEADER_IPV4,
 60         .fields = devlink_dpipe_fields_ipv4,
 61         .fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv4),
 62         .global = true,
 63 };
 64 EXPORT_SYMBOL(devlink_dpipe_header_ipv4);
 65 
 66 static struct devlink_dpipe_field devlink_dpipe_fields_ipv6[] = {
 67         {
 68                 .name = "destination ip",
 69                 .id = DEVLINK_DPIPE_FIELD_IPV6_DST_IP,
 70                 .bitwidth = 128,
 71         },
 72 };
 73 
 74 struct devlink_dpipe_header devlink_dpipe_header_ipv6 = {
 75         .name = "ipv6",
 76         .id = DEVLINK_DPIPE_HEADER_IPV6,
 77         .fields = devlink_dpipe_fields_ipv6,
 78         .fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv6),
 79         .global = true,
 80 };
 81 EXPORT_SYMBOL(devlink_dpipe_header_ipv6);
 82 
 83 EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);
 84 
 85 static LIST_HEAD(devlink_list);
 86 
 87 /* devlink_mutex
 88  *
 89  * An overall lock guarding every operation coming from userspace.
 90  * It also guards devlink devices list and it is taken when
 91  * driver registers/unregisters it.
 92  */
 93 static DEFINE_MUTEX(devlink_mutex);
 94 
 95 static struct net *devlink_net(const struct devlink *devlink)
 96 {
 97         return read_pnet(&devlink->_net);
 98 }
 99 
100 static void devlink_net_set(struct devlink *devlink, struct net *net)
101 {
102         write_pnet(&devlink->_net, net);
103 }
104 
105 static struct devlink *devlink_get_from_attrs(struct net *net,
106                                               struct nlattr **attrs)
107 {
108         struct devlink *devlink;
109         char *busname;
110         char *devname;
111 
112         if (!attrs[DEVLINK_ATTR_BUS_NAME] || !attrs[DEVLINK_ATTR_DEV_NAME])
113                 return ERR_PTR(-EINVAL);
114 
115         busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);
116         devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);
117 
118         list_for_each_entry(devlink, &devlink_list, list) {
119                 if (strcmp(devlink->dev->bus->name, busname) == 0 &&
120                     strcmp(dev_name(devlink->dev), devname) == 0 &&
121                     net_eq(devlink_net(devlink), net))
122                         return devlink;
123         }
124 
125         return ERR_PTR(-ENODEV);
126 }
127 
128 static struct devlink *devlink_get_from_info(struct genl_info *info)
129 {
130         return devlink_get_from_attrs(genl_info_net(info), info->attrs);
131 }
132 
133 static struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
134                                                       int port_index)
135 {
136         struct devlink_port *devlink_port;
137 
138         list_for_each_entry(devlink_port, &devlink->port_list, list) {
139                 if (devlink_port->index == port_index)
140                         return devlink_port;
141         }
142         return NULL;
143 }
144 
145 static bool devlink_port_index_exists(struct devlink *devlink, int port_index)
146 {
147         return devlink_port_get_by_index(devlink, port_index);
148 }
149 
150 static struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
151                                                         struct nlattr **attrs)
152 {
153         if (attrs[DEVLINK_ATTR_PORT_INDEX]) {
154                 u32 port_index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);
155                 struct devlink_port *devlink_port;
156 
157                 devlink_port = devlink_port_get_by_index(devlink, port_index);
158                 if (!devlink_port)
159                         return ERR_PTR(-ENODEV);
160                 return devlink_port;
161         }
162         return ERR_PTR(-EINVAL);
163 }
164 
165 static struct devlink_port *devlink_port_get_from_info(struct devlink *devlink,
166                                                        struct genl_info *info)
167 {
168         return devlink_port_get_from_attrs(devlink, info->attrs);
169 }
170 
171 struct devlink_sb {
172         struct list_head list;
173         unsigned int index;
174         u32 size;
175         u16 ingress_pools_count;
176         u16 egress_pools_count;
177         u16 ingress_tc_count;
178         u16 egress_tc_count;
179 };
180 
181 static u16 devlink_sb_pool_count(struct devlink_sb *devlink_sb)
182 {
183         return devlink_sb->ingress_pools_count + devlink_sb->egress_pools_count;
184 }
185 
186 static struct devlink_sb *devlink_sb_get_by_index(struct devlink *devlink,
187                                                   unsigned int sb_index)
188 {
189         struct devlink_sb *devlink_sb;
190 
191         list_for_each_entry(devlink_sb, &devlink->sb_list, list) {
192                 if (devlink_sb->index == sb_index)
193                         return devlink_sb;
194         }
195         return NULL;
196 }
197 
198 static bool devlink_sb_index_exists(struct devlink *devlink,
199                                     unsigned int sb_index)
200 {
201         return devlink_sb_get_by_index(devlink, sb_index);
202 }
203 
204 static struct devlink_sb *devlink_sb_get_from_attrs(struct devlink *devlink,
205                                                     struct nlattr **attrs)
206 {
207         if (attrs[DEVLINK_ATTR_SB_INDEX]) {
208                 u32 sb_index = nla_get_u32(attrs[DEVLINK_ATTR_SB_INDEX]);
209                 struct devlink_sb *devlink_sb;
210 
211                 devlink_sb = devlink_sb_get_by_index(devlink, sb_index);
212                 if (!devlink_sb)
213                         return ERR_PTR(-ENODEV);
214                 return devlink_sb;
215         }
216         return ERR_PTR(-EINVAL);
217 }
218 
219 static struct devlink_sb *devlink_sb_get_from_info(struct devlink *devlink,
220                                                    struct genl_info *info)
221 {
222         return devlink_sb_get_from_attrs(devlink, info->attrs);
223 }
224 
225 static int devlink_sb_pool_index_get_from_attrs(struct devlink_sb *devlink_sb,
226                                                 struct nlattr **attrs,
227                                                 u16 *p_pool_index)
228 {
229         u16 val;
230 
231         if (!attrs[DEVLINK_ATTR_SB_POOL_INDEX])
232                 return -EINVAL;
233 
234         val = nla_get_u16(attrs[DEVLINK_ATTR_SB_POOL_INDEX]);
235         if (val >= devlink_sb_pool_count(devlink_sb))
236                 return -EINVAL;
237         *p_pool_index = val;
238         return 0;
239 }
240 
241 static int devlink_sb_pool_index_get_from_info(struct devlink_sb *devlink_sb,
242                                                struct genl_info *info,
243                                                u16 *p_pool_index)
244 {
245         return devlink_sb_pool_index_get_from_attrs(devlink_sb, info->attrs,
246                                                     p_pool_index);
247 }
248 
249 static int
250 devlink_sb_pool_type_get_from_attrs(struct nlattr **attrs,
251                                     enum devlink_sb_pool_type *p_pool_type)
252 {
253         u8 val;
254 
255         if (!attrs[DEVLINK_ATTR_SB_POOL_TYPE])
256                 return -EINVAL;
257 
258         val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_TYPE]);
259         if (val != DEVLINK_SB_POOL_TYPE_INGRESS &&
260             val != DEVLINK_SB_POOL_TYPE_EGRESS)
261                 return -EINVAL;
262         *p_pool_type = val;
263         return 0;
264 }
265 
266 static int
267 devlink_sb_pool_type_get_from_info(struct genl_info *info,
268                                    enum devlink_sb_pool_type *p_pool_type)
269 {
270         return devlink_sb_pool_type_get_from_attrs(info->attrs, p_pool_type);
271 }
272 
273 static int
274 devlink_sb_th_type_get_from_attrs(struct nlattr **attrs,
275                                   enum devlink_sb_threshold_type *p_th_type)
276 {
277         u8 val;
278 
279         if (!attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE])
280                 return -EINVAL;
281 
282         val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE]);
283         if (val != DEVLINK_SB_THRESHOLD_TYPE_STATIC &&
284             val != DEVLINK_SB_THRESHOLD_TYPE_DYNAMIC)
285                 return -EINVAL;
286         *p_th_type = val;
287         return 0;
288 }
289 
290 static int
291 devlink_sb_th_type_get_from_info(struct genl_info *info,
292                                  enum devlink_sb_threshold_type *p_th_type)
293 {
294         return devlink_sb_th_type_get_from_attrs(info->attrs, p_th_type);
295 }
296 
297 static int
298 devlink_sb_tc_index_get_from_attrs(struct devlink_sb *devlink_sb,
299                                    struct nlattr **attrs,
300                                    enum devlink_sb_pool_type pool_type,
301                                    u16 *p_tc_index)
302 {
303         u16 val;
304 
305         if (!attrs[DEVLINK_ATTR_SB_TC_INDEX])
306                 return -EINVAL;
307 
308         val = nla_get_u16(attrs[DEVLINK_ATTR_SB_TC_INDEX]);
309         if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS &&
310             val >= devlink_sb->ingress_tc_count)
311                 return -EINVAL;
312         if (pool_type == DEVLINK_SB_POOL_TYPE_EGRESS &&
313             val >= devlink_sb->egress_tc_count)
314                 return -EINVAL;
315         *p_tc_index = val;
316         return 0;
317 }
318 
319 static int
320 devlink_sb_tc_index_get_from_info(struct devlink_sb *devlink_sb,
321                                   struct genl_info *info,
322                                   enum devlink_sb_pool_type pool_type,
323                                   u16 *p_tc_index)
324 {
325         return devlink_sb_tc_index_get_from_attrs(devlink_sb, info->attrs,
326                                                   pool_type, p_tc_index);
327 }
328 
329 struct devlink_region {
330         struct devlink *devlink;
331         struct list_head list;
332         const char *name;
333         struct list_head snapshot_list;
334         u32 max_snapshots;
335         u32 cur_snapshots;
336         u64 size;
337 };
338 
339 struct devlink_snapshot {
340         struct list_head list;
341         struct devlink_region *region;
342         devlink_snapshot_data_dest_t *data_destructor;
343         u64 data_len;
344         u8 *data;
345         u32 id;
346 };
347 
348 static struct devlink_region *
349 devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
350 {
351         struct devlink_region *region;
352 
353         list_for_each_entry(region, &devlink->region_list, list)
354                 if (!strcmp(region->name, region_name))
355                         return region;
356 
357         return NULL;
358 }
359 
360 static struct devlink_snapshot *
361 devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
362 {
363         struct devlink_snapshot *snapshot;
364 
365         list_for_each_entry(snapshot, &region->snapshot_list, list)
366                 if (snapshot->id == id)
367                         return snapshot;
368 
369         return NULL;
370 }
371 
372 static void devlink_region_snapshot_del(struct devlink_snapshot *snapshot)
373 {
374         snapshot->region->cur_snapshots--;
375         list_del(&snapshot->list);
376         (*snapshot->data_destructor)(snapshot->data);
377         kfree(snapshot);
378 }
379 
380 #define DEVLINK_NL_FLAG_NEED_DEVLINK    BIT(0)
381 #define DEVLINK_NL_FLAG_NEED_PORT       BIT(1)
382 #define DEVLINK_NL_FLAG_NEED_SB         BIT(2)
383 
384 /* The per devlink instance lock is taken by default in the pre-doit
385  * operation, yet several commands do not require this. The global
386  * devlink lock is taken and protects from disruption by user-calls.
387  */