~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/core/devlink.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 /* devlink_port_mutex
 96  *
 97  * Shared lock to guard lists of ports in all devlink devices.
 98  */
 99 static DEFINE_MUTEX(devlink_port_mutex);
100 
101 static struct net *devlink_net(const struct devlink *devlink)
102 {
103         return read_pnet(&devlink->_net);
104 }
105 
106 static void devlink_net_set(struct devlink *devlink, struct net *net)
107 {
108         write_pnet(&devlink->_net, net);
109 }
110 
111 static struct devlink *devlink_get_from_attrs(struct net *net,
112                                               struct nlattr **attrs)
113 {
114         struct devlink *devlink;
115         char *busname;
116         char *devname;
117 
118         if (!attrs[DEVLINK_ATTR_BUS_NAME] || !attrs[DEVLINK_ATTR_DEV_NAME])
119                 return ERR_PTR(-EINVAL);
120 
121         busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);
122         devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);
123 
124         list_for_each_entry(devlink, &devlink_list, list) {
125                 if (strcmp(devlink->dev->bus->name, busname) == 0 &&
126                     strcmp(dev_name(devlink->dev), devname) == 0 &&
127                     net_eq(devlink_net(devlink), net))
128                         return devlink;
129         }
130 
131         return ERR_PTR(-ENODEV);
132 }
133 
134 static struct devlink *devlink_get_from_info(struct genl_info *info)
135 {
136         return devlink_get_from_attrs(genl_info_net(info), info->attrs);
137 }
138 
139 static struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
140                                                       int port_index)
141 {
142         struct devlink_port *devlink_port;
143 
144         list_for_each_entry(devlink_port, &devlink->port_list, list) {
145                 if (devlink_port->index == port_index)
146                         return devlink_port;
147         }
148         return NULL;
149 }
150 
151 static bool devlink_port_index_exists(struct devlink *devlink, int port_index)
152 {
153         return devlink_port_get_by_index(devlink, port_index);
154 }
155 
156 static struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
157                                                         struct nlattr **attrs)
158 {
159         if (attrs[DEVLINK_ATTR_PORT_INDEX]) {
160                 u32 port_index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);
161                 struct devlink_port *devlink_port;
162 
163                 devlink_port = devlink_port_get_by_index(devlink, port_index);
164                 if (!devlink_port)
165                         return ERR_PTR(-ENODEV);
166                 return devlink_port;
167         }
168         return ERR_PTR(-EINVAL);
169 }
170 
171 static struct devlink_port *devlink_port_get_from_info(struct devlink *devlink,
172                                                        struct genl_info *info)
173 {
174         return devlink_port_get_from_attrs(devlink, info->attrs);
175 }
176 
177 struct devlink_sb {
178         struct list_head list;
179         unsigned int index;
180         u32 size;
181         u16 ingress_pools_count;
182         u16 egress_pools_count;
183         u16 ingress_tc_count;
184         u16 egress_tc_count;
185 };
186 
187 static u16 devlink_sb_pool_count(struct devlink_sb *devlink_sb)
188 {
189         return devlink_sb->ingress_pools_count + devlink_sb->egress_pools_count;
190 }
191 
192 static struct devlink_sb *devlink_sb_get_by_index(struct devlink *devlink,
193                                                   unsigned int sb_index)
194 {
195         struct devlink_sb *devlink_sb;
196 
197         list_for_each_entry(devlink_sb, &devlink->sb_list, list) {
198                 if (devlink_sb->index == sb_index)
199                         return devlink_sb;
200         }
201         return NULL;
202 }
203 
204 static bool devlink_sb_index_exists(struct devlink *devlink,
205                                     unsigned int sb_index)
206 {
207         return devlink_sb_get_by_index(devlink, sb_index);
208 }
209 
210 static struct devlink_sb *devlink_sb_get_from_attrs(struct devlink *devlink,
211                                                     struct nlattr **attrs)
212 {
213         if (attrs[DEVLINK_ATTR_SB_INDEX]) {
214                 u32 sb_index = nla_get_u32(attrs[DEVLINK_ATTR_SB_INDEX]);
215                 struct devlink_sb *devlink_sb;
216 
217                 devlink_sb = devlink_sb_get_by_index(devlink, sb_index);
218                 if (!devlink_sb)
219                         return ERR_PTR(-ENODEV);
220                 return devlink_sb;
221         }
222         return ERR_PTR(-EINVAL);
223 }
224 
225 static struct devlink_sb *devlink_sb_get_from_info(struct devlink *devlink,
226                                                    struct genl_info *info)
227 {
228         return devlink_sb_get_from_attrs(devlink, info->attrs);
229 }
230 
231 static int devlink_sb_pool_index_get_from_attrs(struct devlink_sb *devlink_sb,
232                                                 struct nlattr **attrs,
233                                                 u16 *p_pool_index)
234 {
235         u16 val;
236 
237         if (!attrs[DEVLINK_ATTR_SB_POOL_INDEX])
238                 return -EINVAL;
239 
240         val = nla_get_u16(attrs[DEVLINK_ATTR_SB_POOL_INDEX]);
241         if (val >= devlink_sb_pool_count(devlink_sb))
242                 return -EINVAL;
243         *p_pool_index = val;
244         return 0;
245 }
246 
247 static int devlink_sb_pool_index_get_from_info(struct devlink_sb *devlink_sb,
248                                                struct genl_info *info,
249                                                u16 *p_pool_index)
250 {
251         return devlink_sb_pool_index_get_from_attrs(devlink_sb, info->attrs,
252                                                     p_pool_index);
253 }
254 
255 static int
256 devlink_sb_pool_type_get_from_attrs(struct nlattr **attrs,
257                                     enum devlink_sb_pool_type *p_pool_type)
258 {
259         u8 val;
260 
261         if (!attrs[DEVLINK_ATTR_SB_POOL_TYPE])
262                 return -EINVAL;
263 
264         val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_TYPE]);
265         if (val != DEVLINK_SB_POOL_TYPE_INGRESS &&
266             val != DEVLINK_SB_POOL_TYPE_EGRESS)
267                 return -EINVAL;
268         *p_pool_type = val;
269         return 0;
270 }
271 
272 static int
273 devlink_sb_pool_type_get_from_info(struct genl_info *info,
274                                    enum devlink_sb_pool_type *p_pool_type)
275 {
276         return devlink_sb_pool_type_get_from_attrs(info->attrs, p_pool_type);
277 }
278 
279 static int
280 devlink_sb_th_type_get_from_attrs(struct nlattr **attrs,
281                                   enum devlink_sb_threshold_type *p_th_type)
282 {
283         u8 val;
284 
285         if (!attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE])
286                 return -EINVAL;
287 
288         val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE]);
289         if (val != DEVLINK_SB_THRESHOLD_TYPE_STATIC &&
290             val != DEVLINK_SB_THRESHOLD_TYPE_DYNAMIC)
291                 return -EINVAL;
292         *p_th_type = val;
293         return 0;
294 }
295 
296 static int
297 devlink_sb_th_type_get_from_info(struct genl_info *info,
298                                  enum devlink_sb_threshold_type *p_th_type)
299 {
300         return devlink_sb_th_type_get_from_attrs(info->attrs, p_th_type);
301 }
302 
303 static int
304 devlink_sb_tc_index_get_from_attrs(struct devlink_sb *devlink_sb,
305                                    struct nlattr **attrs,
306                                    enum devlink_sb_pool_type pool_type,
307                                    u16 *p_tc_index)
308 {
309         u16 val;
310 
311         if (!attrs[DEVLINK_ATTR_SB_TC_INDEX])
312                 return -EINVAL;
313 
314         val = nla_get_u16(attrs[DEVLINK_ATTR_SB_TC_INDEX]);
315         if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS &&
316             val >= devlink_sb->ingress_tc_count)
317                 return -EINVAL;
318         if (pool_type == DEVLINK_SB_POOL_TYPE_EGRESS &&
319             val >= devlink_sb->egress_tc_count)
320                 return -EINVAL;
321         *p_tc_index = val;
322         return 0;
323 }
324 
325 static int
326 devlink_sb_tc_index_get_from_info(struct devlink_sb *devlink_sb,
327                                   struct genl_info *info,
328                                   enum devlink_sb_pool_type pool_type,
329                                   u16 *p_tc_index)
330 {
331         return devlink_sb_tc_index_get_from_attrs(devlink_sb, info->attrs,
332                                                   pool_type, p_tc_index);
333 }
334 
335 #define DEVLINK_NL_FLAG_NEED_DEVLINK    BIT(0)
336 #define DEVLINK_NL_FLAG_NEED_PORT       BIT(1)
337 #define DEVLINK_NL_FLAG_NEED_SB         BIT(2)
338 #define DEVLINK_NL_FLAG_LOCK_PORTS      BIT(3)
339         /* port is not needed but we need to ensure they don't
340          * change in the middle of command
341          */