netdevice.h 84 KB

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  1. /*
  2. * INET An implementation of the TCP/IP protocol suite for the LINUX
  3. * operating system. INET is implemented using the BSD Socket
  4. * interface as the means of communication with the user level.
  5. *
  6. * Definitions for the Interfaces handler.
  7. *
  8. * Version: @(#)dev.h 1.0.10 08/12/93
  9. *
  10. * Authors: Ross Biro
  11. * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12. * Corey Minyard <wf-rch!minyard@relay.EU.net>
  13. * Donald J. Becker, <becker@cesdis.gsfc.nasa.gov>
  14. * Alan Cox, <alan@lxorguk.ukuu.org.uk>
  15. * Bjorn Ekwall. <bj0rn@blox.se>
  16. * Pekka Riikonen <priikone@poseidon.pspt.fi>
  17. *
  18. * This program is free software; you can redistribute it and/or
  19. * modify it under the terms of the GNU General Public License
  20. * as published by the Free Software Foundation; either version
  21. * 2 of the License, or (at your option) any later version.
  22. *
  23. * Moved to /usr/include/linux for NET3
  24. */
  25. #ifndef _LINUX_NETDEVICE_H
  26. #define _LINUX_NETDEVICE_H
  27. #include <linux/if.h>
  28. #include <linux/if_ether.h>
  29. #include <linux/if_packet.h>
  30. #include <linux/if_link.h>
  31. #ifdef __KERNEL__
  32. #include <linux/pm_qos.h>
  33. #include <linux/timer.h>
  34. #include <linux/bug.h>
  35. #include <linux/delay.h>
  36. #include <linux/atomic.h>
  37. #include <asm/cache.h>
  38. #include <asm/byteorder.h>
  39. #include <linux/percpu.h>
  40. #include <linux/rculist.h>
  41. #include <linux/dmaengine.h>
  42. #include <linux/workqueue.h>
  43. #include <linux/dynamic_queue_limits.h>
  44. #include <linux/ethtool.h>
  45. #include <net/net_namespace.h>
  46. #include <net/dsa.h>
  47. #ifdef CONFIG_DCB
  48. #include <net/dcbnl.h>
  49. #endif
  50. #include <net/netprio_cgroup.h>
  51. #include <linux/netdev_features.h>
  52. struct netpoll_info;
  53. struct device;
  54. struct phy_device;
  55. /* 802.11 specific */
  56. struct wireless_dev;
  57. /* source back-compat hooks */
  58. #define SET_ETHTOOL_OPS(netdev,ops) \
  59. ( (netdev)->ethtool_ops = (ops) )
  60. /* hardware address assignment types */
  61. #define NET_ADDR_PERM 0 /* address is permanent (default) */
  62. #define NET_ADDR_RANDOM 1 /* address is generated randomly */
  63. #define NET_ADDR_STOLEN 2 /* address is stolen from other device */
  64. /* Backlog congestion levels */
  65. #define NET_RX_SUCCESS 0 /* keep 'em coming, baby */
  66. #define NET_RX_DROP 1 /* packet dropped */
  67. /*
  68. * Transmit return codes: transmit return codes originate from three different
  69. * namespaces:
  70. *
  71. * - qdisc return codes
  72. * - driver transmit return codes
  73. * - errno values
  74. *
  75. * Drivers are allowed to return any one of those in their hard_start_xmit()
  76. * function. Real network devices commonly used with qdiscs should only return
  77. * the driver transmit return codes though - when qdiscs are used, the actual
  78. * transmission happens asynchronously, so the value is not propagated to
  79. * higher layers. Virtual network devices transmit synchronously, in this case
  80. * the driver transmit return codes are consumed by dev_queue_xmit(), all
  81. * others are propagated to higher layers.
  82. */
  83. /* qdisc ->enqueue() return codes. */
  84. #define NET_XMIT_SUCCESS 0x00
  85. #define NET_XMIT_DROP 0x01 /* skb dropped */
  86. #define NET_XMIT_CN 0x02 /* congestion notification */
  87. #define NET_XMIT_POLICED 0x03 /* skb is shot by police */
  88. #define NET_XMIT_MASK 0x0f /* qdisc flags in net/sch_generic.h */
  89. /* NET_XMIT_CN is special. It does not guarantee that this packet is lost. It
  90. * indicates that the device will soon be dropping packets, or already drops
  91. * some packets of the same priority; prompting us to send less aggressively. */
  92. #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e))
  93. #define net_xmit_errno(e) ((e) != NET_XMIT_CN ? -ENOBUFS : 0)
  94. /* Driver transmit return codes */
  95. #define NETDEV_TX_MASK 0xf0
  96. enum netdev_tx {
  97. __NETDEV_TX_MIN = INT_MIN, /* make sure enum is signed */
  98. NETDEV_TX_OK = 0x00, /* driver took care of packet */
  99. NETDEV_TX_BUSY = 0x10, /* driver tx path was busy*/
  100. NETDEV_TX_LOCKED = 0x20, /* driver tx lock was already taken */
  101. };
  102. typedef enum netdev_tx netdev_tx_t;
  103. /*
  104. * Current order: NETDEV_TX_MASK > NET_XMIT_MASK >= 0 is significant;
  105. * hard_start_xmit() return < NET_XMIT_MASK means skb was consumed.
  106. */
  107. static inline bool dev_xmit_complete(int rc)
  108. {
  109. /*
  110. * Positive cases with an skb consumed by a driver:
  111. * - successful transmission (rc == NETDEV_TX_OK)
  112. * - error while transmitting (rc < 0)
  113. * - error while queueing to a different device (rc & NET_XMIT_MASK)
  114. */
  115. if (likely(rc < NET_XMIT_MASK))
  116. return true;
  117. return false;
  118. }
  119. #endif
  120. #define MAX_ADDR_LEN 32 /* Largest hardware address length */
  121. /* Initial net device group. All devices belong to group 0 by default. */
  122. #define INIT_NETDEV_GROUP 0
  123. #ifdef __KERNEL__
  124. /*
  125. * Compute the worst case header length according to the protocols
  126. * used.
  127. */
  128. #if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
  129. # if defined(CONFIG_MAC80211_MESH)
  130. # define LL_MAX_HEADER 128
  131. # else
  132. # define LL_MAX_HEADER 96
  133. # endif
  134. #elif IS_ENABLED(CONFIG_TR)
  135. # define LL_MAX_HEADER 48
  136. #else
  137. # define LL_MAX_HEADER 32
  138. #endif
  139. #if !IS_ENABLED(CONFIG_NET_IPIP) && !IS_ENABLED(CONFIG_NET_IPGRE) && \
  140. !IS_ENABLED(CONFIG_IPV6_SIT) && !IS_ENABLED(CONFIG_IPV6_TUNNEL)
  141. #define MAX_HEADER LL_MAX_HEADER
  142. #else
  143. #define MAX_HEADER (LL_MAX_HEADER + 48)
  144. #endif
  145. /*
  146. * Old network device statistics. Fields are native words
  147. * (unsigned long) so they can be read and written atomically.
  148. */
  149. struct net_device_stats {
  150. unsigned long rx_packets;
  151. unsigned long tx_packets;
  152. unsigned long rx_bytes;
  153. unsigned long tx_bytes;
  154. unsigned long rx_errors;
  155. unsigned long tx_errors;
  156. unsigned long rx_dropped;
  157. unsigned long tx_dropped;
  158. unsigned long multicast;
  159. unsigned long collisions;
  160. unsigned long rx_length_errors;
  161. unsigned long rx_over_errors;
  162. unsigned long rx_crc_errors;
  163. unsigned long rx_frame_errors;
  164. unsigned long rx_fifo_errors;
  165. unsigned long rx_missed_errors;
  166. unsigned long tx_aborted_errors;
  167. unsigned long tx_carrier_errors;
  168. unsigned long tx_fifo_errors;
  169. unsigned long tx_heartbeat_errors;
  170. unsigned long tx_window_errors;
  171. unsigned long rx_compressed;
  172. unsigned long tx_compressed;
  173. };
  174. #endif /* __KERNEL__ */
  175. /* Media selection options. */
  176. enum {
  177. IF_PORT_UNKNOWN = 0,
  178. IF_PORT_10BASE2,
  179. IF_PORT_10BASET,
  180. IF_PORT_AUI,
  181. IF_PORT_100BASET,
  182. IF_PORT_100BASETX,
  183. IF_PORT_100BASEFX
  184. };
  185. #ifdef __KERNEL__
  186. #include <linux/cache.h>
  187. #include <linux/skbuff.h>
  188. #ifdef CONFIG_RPS
  189. #include <linux/static_key.h>
  190. extern struct static_key rps_needed;
  191. #endif
  192. struct neighbour;
  193. struct neigh_parms;
  194. struct sk_buff;
  195. struct netdev_hw_addr {
  196. struct list_head list;
  197. unsigned char addr[MAX_ADDR_LEN];
  198. unsigned char type;
  199. #define NETDEV_HW_ADDR_T_LAN 1
  200. #define NETDEV_HW_ADDR_T_SAN 2
  201. #define NETDEV_HW_ADDR_T_SLAVE 3
  202. #define NETDEV_HW_ADDR_T_UNICAST 4
  203. #define NETDEV_HW_ADDR_T_MULTICAST 5
  204. bool synced;
  205. bool global_use;
  206. int refcount;
  207. struct rcu_head rcu_head;
  208. };
  209. struct netdev_hw_addr_list {
  210. struct list_head list;
  211. int count;
  212. };
  213. #define netdev_hw_addr_list_count(l) ((l)->count)
  214. #define netdev_hw_addr_list_empty(l) (netdev_hw_addr_list_count(l) == 0)
  215. #define netdev_hw_addr_list_for_each(ha, l) \
  216. list_for_each_entry(ha, &(l)->list, list)
  217. #define netdev_uc_count(dev) netdev_hw_addr_list_count(&(dev)->uc)
  218. #define netdev_uc_empty(dev) netdev_hw_addr_list_empty(&(dev)->uc)
  219. #define netdev_for_each_uc_addr(ha, dev) \
  220. netdev_hw_addr_list_for_each(ha, &(dev)->uc)
  221. #define netdev_mc_count(dev) netdev_hw_addr_list_count(&(dev)->mc)
  222. #define netdev_mc_empty(dev) netdev_hw_addr_list_empty(&(dev)->mc)
  223. #define netdev_for_each_mc_addr(ha, dev) \
  224. netdev_hw_addr_list_for_each(ha, &(dev)->mc)
  225. struct hh_cache {
  226. u16 hh_len;
  227. u16 __pad;
  228. seqlock_t hh_lock;
  229. /* cached hardware header; allow for machine alignment needs. */
  230. #define HH_DATA_MOD 16
  231. #define HH_DATA_OFF(__len) \
  232. (HH_DATA_MOD - (((__len - 1) & (HH_DATA_MOD - 1)) + 1))
  233. #define HH_DATA_ALIGN(__len) \
  234. (((__len)+(HH_DATA_MOD-1))&~(HH_DATA_MOD - 1))
  235. unsigned long hh_data[HH_DATA_ALIGN(LL_MAX_HEADER) / sizeof(long)];
  236. };
  237. /* Reserve HH_DATA_MOD byte aligned hard_header_len, but at least that much.
  238. * Alternative is:
  239. * dev->hard_header_len ? (dev->hard_header_len +
  240. * (HH_DATA_MOD - 1)) & ~(HH_DATA_MOD - 1) : 0
  241. *
  242. * We could use other alignment values, but we must maintain the
  243. * relationship HH alignment <= LL alignment.
  244. */
  245. #define LL_RESERVED_SPACE(dev) \
  246. ((((dev)->hard_header_len+(dev)->needed_headroom)&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
  247. #define LL_RESERVED_SPACE_EXTRA(dev,extra) \
  248. ((((dev)->hard_header_len+(dev)->needed_headroom+(extra))&~(HH_DATA_MOD - 1)) + HH_DATA_MOD)
  249. struct header_ops {
  250. int (*create) (struct sk_buff *skb, struct net_device *dev,
  251. unsigned short type, const void *daddr,
  252. const void *saddr, unsigned len);
  253. int (*parse)(const struct sk_buff *skb, unsigned char *haddr);
  254. int (*rebuild)(struct sk_buff *skb);
  255. int (*cache)(const struct neighbour *neigh, struct hh_cache *hh, __be16 type);
  256. void (*cache_update)(struct hh_cache *hh,
  257. const struct net_device *dev,
  258. const unsigned char *haddr);
  259. };
  260. /* These flag bits are private to the generic network queueing
  261. * layer, they may not be explicitly referenced by any other
  262. * code.
  263. */
  264. enum netdev_state_t {
  265. __LINK_STATE_START,
  266. __LINK_STATE_PRESENT,
  267. __LINK_STATE_NOCARRIER,
  268. __LINK_STATE_LINKWATCH_PENDING,
  269. __LINK_STATE_DORMANT,
  270. };
  271. /*
  272. * This structure holds at boot time configured netdevice settings. They
  273. * are then used in the device probing.
  274. */
  275. struct netdev_boot_setup {
  276. char name[IFNAMSIZ];
  277. struct ifmap map;
  278. };
  279. #define NETDEV_BOOT_SETUP_MAX 8
  280. extern int __init netdev_boot_setup(char *str);
  281. /*
  282. * Structure for NAPI scheduling similar to tasklet but with weighting
  283. */
  284. struct napi_struct {
  285. /* The poll_list must only be managed by the entity which
  286. * changes the state of the NAPI_STATE_SCHED bit. This means
  287. * whoever atomically sets that bit can add this napi_struct
  288. * to the per-cpu poll_list, and whoever clears that bit
  289. * can remove from the list right before clearing the bit.
  290. */
  291. struct list_head poll_list;
  292. unsigned long state;
  293. int weight;
  294. int (*poll)(struct napi_struct *, int);
  295. #ifdef CONFIG_NETPOLL
  296. spinlock_t poll_lock;
  297. int poll_owner;
  298. #endif
  299. unsigned int gro_count;
  300. struct net_device *dev;
  301. struct list_head dev_list;
  302. struct sk_buff *gro_list;
  303. struct sk_buff *skb;
  304. };
  305. enum {
  306. NAPI_STATE_SCHED, /* Poll is scheduled */
  307. NAPI_STATE_DISABLE, /* Disable pending */
  308. NAPI_STATE_NPSVC, /* Netpoll - don't dequeue from poll_list */
  309. };
  310. enum gro_result {
  311. GRO_MERGED,
  312. GRO_MERGED_FREE,
  313. GRO_HELD,
  314. GRO_NORMAL,
  315. GRO_DROP,
  316. };
  317. typedef enum gro_result gro_result_t;
  318. /*
  319. * enum rx_handler_result - Possible return values for rx_handlers.
  320. * @RX_HANDLER_CONSUMED: skb was consumed by rx_handler, do not process it
  321. * further.
  322. * @RX_HANDLER_ANOTHER: Do another round in receive path. This is indicated in
  323. * case skb->dev was changed by rx_handler.
  324. * @RX_HANDLER_EXACT: Force exact delivery, no wildcard.
  325. * @RX_HANDLER_PASS: Do nothing, passe the skb as if no rx_handler was called.
  326. *
  327. * rx_handlers are functions called from inside __netif_receive_skb(), to do
  328. * special processing of the skb, prior to delivery to protocol handlers.
  329. *
  330. * Currently, a net_device can only have a single rx_handler registered. Trying
  331. * to register a second rx_handler will return -EBUSY.
  332. *
  333. * To register a rx_handler on a net_device, use netdev_rx_handler_register().
  334. * To unregister a rx_handler on a net_device, use
  335. * netdev_rx_handler_unregister().
  336. *
  337. * Upon return, rx_handler is expected to tell __netif_receive_skb() what to
  338. * do with the skb.
  339. *
  340. * If the rx_handler consumed to skb in some way, it should return
  341. * RX_HANDLER_CONSUMED. This is appropriate when the rx_handler arranged for
  342. * the skb to be delivered in some other ways.
  343. *
  344. * If the rx_handler changed skb->dev, to divert the skb to another
  345. * net_device, it should return RX_HANDLER_ANOTHER. The rx_handler for the
  346. * new device will be called if it exists.
  347. *
  348. * If the rx_handler consider the skb should be ignored, it should return
  349. * RX_HANDLER_EXACT. The skb will only be delivered to protocol handlers that
  350. * are registred on exact device (ptype->dev == skb->dev).
  351. *
  352. * If the rx_handler didn't changed skb->dev, but want the skb to be normally
  353. * delivered, it should return RX_HANDLER_PASS.
  354. *
  355. * A device without a registered rx_handler will behave as if rx_handler
  356. * returned RX_HANDLER_PASS.
  357. */
  358. enum rx_handler_result {
  359. RX_HANDLER_CONSUMED,
  360. RX_HANDLER_ANOTHER,
  361. RX_HANDLER_EXACT,
  362. RX_HANDLER_PASS,
  363. };
  364. typedef enum rx_handler_result rx_handler_result_t;
  365. typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
  366. extern void __napi_schedule(struct napi_struct *n);
  367. static inline bool napi_disable_pending(struct napi_struct *n)
  368. {
  369. return test_bit(NAPI_STATE_DISABLE, &n->state);
  370. }
  371. /**
  372. * napi_schedule_prep - check if napi can be scheduled
  373. * @n: napi context
  374. *
  375. * Test if NAPI routine is already running, and if not mark
  376. * it as running. This is used as a condition variable
  377. * insure only one NAPI poll instance runs. We also make
  378. * sure there is no pending NAPI disable.
  379. */
  380. static inline bool napi_schedule_prep(struct napi_struct *n)
  381. {
  382. return !napi_disable_pending(n) &&
  383. !test_and_set_bit(NAPI_STATE_SCHED, &n->state);
  384. }
  385. /**
  386. * napi_schedule - schedule NAPI poll
  387. * @n: napi context
  388. *
  389. * Schedule NAPI poll routine to be called if it is not already
  390. * running.
  391. */
  392. static inline void napi_schedule(struct napi_struct *n)
  393. {
  394. if (napi_schedule_prep(n))
  395. __napi_schedule(n);
  396. }
  397. /* Try to reschedule poll. Called by dev->poll() after napi_complete(). */
  398. static inline bool napi_reschedule(struct napi_struct *napi)
  399. {
  400. if (napi_schedule_prep(napi)) {
  401. __napi_schedule(napi);
  402. return true;
  403. }
  404. return false;
  405. }
  406. /**
  407. * napi_complete - NAPI processing complete
  408. * @n: napi context
  409. *
  410. * Mark NAPI processing as complete.
  411. */
  412. extern void __napi_complete(struct napi_struct *n);
  413. extern void napi_complete(struct napi_struct *n);
  414. /**
  415. * napi_disable - prevent NAPI from scheduling
  416. * @n: napi context
  417. *
  418. * Stop NAPI from being scheduled on this context.
  419. * Waits till any outstanding processing completes.
  420. */
  421. static inline void napi_disable(struct napi_struct *n)
  422. {
  423. set_bit(NAPI_STATE_DISABLE, &n->state);
  424. while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
  425. msleep(1);
  426. clear_bit(NAPI_STATE_DISABLE, &n->state);
  427. }
  428. /**
  429. * napi_enable - enable NAPI scheduling
  430. * @n: napi context
  431. *
  432. * Resume NAPI from being scheduled on this context.
  433. * Must be paired with napi_disable.
  434. */
  435. static inline void napi_enable(struct napi_struct *n)
  436. {
  437. BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
  438. smp_mb__before_clear_bit();
  439. clear_bit(NAPI_STATE_SCHED, &n->state);
  440. }
  441. #ifdef CONFIG_SMP
  442. /**
  443. * napi_synchronize - wait until NAPI is not running
  444. * @n: napi context
  445. *
  446. * Wait until NAPI is done being scheduled on this context.
  447. * Waits till any outstanding processing completes but
  448. * does not disable future activations.
  449. */
  450. static inline void napi_synchronize(const struct napi_struct *n)
  451. {
  452. while (test_bit(NAPI_STATE_SCHED, &n->state))
  453. msleep(1);
  454. }
  455. #else
  456. # define napi_synchronize(n) barrier()
  457. #endif
  458. enum netdev_queue_state_t {
  459. __QUEUE_STATE_DRV_XOFF,
  460. __QUEUE_STATE_STACK_XOFF,
  461. __QUEUE_STATE_FROZEN,
  462. #define QUEUE_STATE_ANY_XOFF ((1 << __QUEUE_STATE_DRV_XOFF) | \
  463. (1 << __QUEUE_STATE_STACK_XOFF))
  464. #define QUEUE_STATE_ANY_XOFF_OR_FROZEN (QUEUE_STATE_ANY_XOFF | \
  465. (1 << __QUEUE_STATE_FROZEN))
  466. };
  467. /*
  468. * __QUEUE_STATE_DRV_XOFF is used by drivers to stop the transmit queue. The
  469. * netif_tx_* functions below are used to manipulate this flag. The
  470. * __QUEUE_STATE_STACK_XOFF flag is used by the stack to stop the transmit
  471. * queue independently. The netif_xmit_*stopped functions below are called
  472. * to check if the queue has been stopped by the driver or stack (either
  473. * of the XOFF bits are set in the state). Drivers should not need to call
  474. * netif_xmit*stopped functions, they should only be using netif_tx_*.
  475. */
  476. struct netdev_queue {
  477. /*
  478. * read mostly part
  479. */
  480. struct net_device *dev;
  481. struct Qdisc *qdisc;
  482. struct Qdisc *qdisc_sleeping;
  483. #ifdef CONFIG_SYSFS
  484. struct kobject kobj;
  485. #endif
  486. #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  487. int numa_node;
  488. #endif
  489. /*
  490. * write mostly part
  491. */
  492. spinlock_t _xmit_lock ____cacheline_aligned_in_smp;
  493. int xmit_lock_owner;
  494. /*
  495. * please use this field instead of dev->trans_start
  496. */
  497. unsigned long trans_start;
  498. /*
  499. * Number of TX timeouts for this queue
  500. * (/sys/class/net/DEV/Q/trans_timeout)
  501. */
  502. unsigned long trans_timeout;
  503. unsigned long state;
  504. #ifdef CONFIG_BQL
  505. struct dql dql;
  506. #endif
  507. } ____cacheline_aligned_in_smp;
  508. static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
  509. {
  510. #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  511. return q->numa_node;
  512. #else
  513. return NUMA_NO_NODE;
  514. #endif
  515. }
  516. static inline void netdev_queue_numa_node_write(struct netdev_queue *q, int node)
  517. {
  518. #if defined(CONFIG_XPS) && defined(CONFIG_NUMA)
  519. q->numa_node = node;
  520. #endif
  521. }
  522. #ifdef CONFIG_RPS
  523. /*
  524. * This structure holds an RPS map which can be of variable length. The
  525. * map is an array of CPUs.
  526. */
  527. struct rps_map {
  528. unsigned int len;
  529. struct rcu_head rcu;
  530. u16 cpus[0];
  531. };
  532. #define RPS_MAP_SIZE(_num) (sizeof(struct rps_map) + ((_num) * sizeof(u16)))
  533. /*
  534. * The rps_dev_flow structure contains the mapping of a flow to a CPU, the
  535. * tail pointer for that CPU's input queue at the time of last enqueue, and
  536. * a hardware filter index.
  537. */
  538. struct rps_dev_flow {
  539. u16 cpu;
  540. u16 filter;
  541. unsigned int last_qtail;
  542. };
  543. #define RPS_NO_FILTER 0xffff
  544. /*
  545. * The rps_dev_flow_table structure contains a table of flow mappings.
  546. */
  547. struct rps_dev_flow_table {
  548. unsigned int mask;
  549. struct rcu_head rcu;
  550. struct work_struct free_work;
  551. struct rps_dev_flow flows[0];
  552. };
  553. #define RPS_DEV_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_dev_flow_table) + \
  554. ((_num) * sizeof(struct rps_dev_flow)))
  555. /*
  556. * The rps_sock_flow_table contains mappings of flows to the last CPU
  557. * on which they were processed by the application (set in recvmsg).
  558. */
  559. struct rps_sock_flow_table {
  560. unsigned int mask;
  561. u16 ents[0];
  562. };
  563. #define RPS_SOCK_FLOW_TABLE_SIZE(_num) (sizeof(struct rps_sock_flow_table) + \
  564. ((_num) * sizeof(u16)))
  565. #define RPS_NO_CPU 0xffff
  566. static inline void rps_record_sock_flow(struct rps_sock_flow_table *table,
  567. u32 hash)
  568. {
  569. if (table && hash) {
  570. unsigned int cpu, index = hash & table->mask;
  571. /* We only give a hint, preemption can change cpu under us */
  572. cpu = raw_smp_processor_id();
  573. if (table->ents[index] != cpu)
  574. table->ents[index] = cpu;
  575. }
  576. }
  577. static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
  578. u32 hash)
  579. {
  580. if (table && hash)
  581. table->ents[hash & table->mask] = RPS_NO_CPU;
  582. }
  583. extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
  584. #ifdef CONFIG_RFS_ACCEL
  585. extern bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
  586. u32 flow_id, u16 filter_id);
  587. #endif
  588. /* This structure contains an instance of an RX queue. */
  589. struct netdev_rx_queue {
  590. struct rps_map __rcu *rps_map;
  591. struct rps_dev_flow_table __rcu *rps_flow_table;
  592. struct kobject kobj;
  593. struct net_device *dev;
  594. } ____cacheline_aligned_in_smp;
  595. #endif /* CONFIG_RPS */
  596. #ifdef CONFIG_XPS
  597. /*
  598. * This structure holds an XPS map which can be of variable length. The
  599. * map is an array of queues.
  600. */
  601. struct xps_map {
  602. unsigned int len;
  603. unsigned int alloc_len;
  604. struct rcu_head rcu;
  605. u16 queues[0];
  606. };
  607. #define XPS_MAP_SIZE(_num) (sizeof(struct xps_map) + ((_num) * sizeof(u16)))
  608. #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
  609. / sizeof(u16))
  610. /*
  611. * This structure holds all XPS maps for device. Maps are indexed by CPU.
  612. */
  613. struct xps_dev_maps {
  614. struct rcu_head rcu;
  615. struct xps_map __rcu *cpu_map[0];
  616. };
  617. #define XPS_DEV_MAPS_SIZE (sizeof(struct xps_dev_maps) + \
  618. (nr_cpu_ids * sizeof(struct xps_map *)))
  619. #endif /* CONFIG_XPS */
  620. #define TC_MAX_QUEUE 16
  621. #define TC_BITMASK 15
  622. /* HW offloaded queuing disciplines txq count and offset maps */
  623. struct netdev_tc_txq {
  624. u16 count;
  625. u16 offset;
  626. };
  627. #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
  628. /*
  629. * This structure is to hold information about the device
  630. * configured to run FCoE protocol stack.
  631. */
  632. struct netdev_fcoe_hbainfo {
  633. char manufacturer[64];
  634. char serial_number[64];
  635. char hardware_version[64];
  636. char driver_version[64];
  637. char optionrom_version[64];
  638. char firmware_version[64];
  639. char model[256];
  640. char model_description[256];
  641. };
  642. #endif
  643. /*
  644. * This structure defines the management hooks for network devices.
  645. * The following hooks can be defined; unless noted otherwise, they are
  646. * optional and can be filled with a null pointer.
  647. *
  648. * int (*ndo_init)(struct net_device *dev);
  649. * This function is called once when network device is registered.
  650. * The network device can use this to any late stage initializaton
  651. * or semantic validattion. It can fail with an error code which will
  652. * be propogated back to register_netdev
  653. *
  654. * void (*ndo_uninit)(struct net_device *dev);
  655. * This function is called when device is unregistered or when registration
  656. * fails. It is not called if init fails.
  657. *
  658. * int (*ndo_open)(struct net_device *dev);
  659. * This function is called when network device transistions to the up
  660. * state.
  661. *
  662. * int (*ndo_stop)(struct net_device *dev);
  663. * This function is called when network device transistions to the down
  664. * state.
  665. *
  666. * netdev_tx_t (*ndo_start_xmit)(struct sk_buff *skb,
  667. * struct net_device *dev);
  668. * Called when a packet needs to be transmitted.
  669. * Must return NETDEV_TX_OK , NETDEV_TX_BUSY.
  670. * (can also return NETDEV_TX_LOCKED iff NETIF_F_LLTX)
  671. * Required can not be NULL.
  672. *
  673. * u16 (*ndo_select_queue)(struct net_device *dev, struct sk_buff *skb);
  674. * Called to decide which queue to when device supports multiple
  675. * transmit queues.
  676. *
  677. * void (*ndo_change_rx_flags)(struct net_device *dev, int flags);
  678. * This function is called to allow device receiver to make
  679. * changes to configuration when multicast or promiscious is enabled.
  680. *
  681. * void (*ndo_set_rx_mode)(struct net_device *dev);
  682. * This function is called device changes address list filtering.
  683. * If driver handles unicast address filtering, it should set
  684. * IFF_UNICAST_FLT to its priv_flags.
  685. *
  686. * int (*ndo_set_mac_address)(struct net_device *dev, void *addr);
  687. * This function is called when the Media Access Control address
  688. * needs to be changed. If this interface is not defined, the
  689. * mac address can not be changed.
  690. *
  691. * int (*ndo_validate_addr)(struct net_device *dev);
  692. * Test if Media Access Control address is valid for the device.
  693. *
  694. * int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);
  695. * Called when a user request an ioctl which can't be handled by
  696. * the generic interface code. If not defined ioctl's return
  697. * not supported error code.
  698. *
  699. * int (*ndo_set_config)(struct net_device *dev, struct ifmap *map);
  700. * Used to set network devices bus interface parameters. This interface
  701. * is retained for legacy reason, new devices should use the bus
  702. * interface (PCI) for low level management.
  703. *
  704. * int (*ndo_change_mtu)(struct net_device *dev, int new_mtu);
  705. * Called when a user wants to change the Maximum Transfer Unit
  706. * of a device. If not defined, any request to change MTU will
  707. * will return an error.
  708. *
  709. * void (*ndo_tx_timeout)(struct net_device *dev);
  710. * Callback uses when the transmitter has not made any progress
  711. * for dev->watchdog ticks.
  712. *
  713. * struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
  714. * struct rtnl_link_stats64 *storage);
  715. * struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
  716. * Called when a user wants to get the network device usage
  717. * statistics. Drivers must do one of the following:
  718. * 1. Define @ndo_get_stats64 to fill in a zero-initialised
  719. * rtnl_link_stats64 structure passed by the caller.
  720. * 2. Define @ndo_get_stats to update a net_device_stats structure
  721. * (which should normally be dev->stats) and return a pointer to
  722. * it. The structure may be changed asynchronously only if each
  723. * field is written atomically.
  724. * 3. Update dev->stats asynchronously and atomically, and define
  725. * neither operation.
  726. *
  727. * int (*ndo_vlan_rx_add_vid)(struct net_device *dev, unsigned short vid);
  728. * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
  729. * this function is called when a VLAN id is registered.
  730. *
  731. * int (*ndo_vlan_rx_kill_vid)(struct net_device *dev, unsigned short vid);
  732. * If device support VLAN filtering (dev->features & NETIF_F_HW_VLAN_FILTER)
  733. * this function is called when a VLAN id is unregistered.
  734. *
  735. * void (*ndo_poll_controller)(struct net_device *dev);
  736. *
  737. * SR-IOV management functions.
  738. * int (*ndo_set_vf_mac)(struct net_device *dev, int vf, u8* mac);
  739. * int (*ndo_set_vf_vlan)(struct net_device *dev, int vf, u16 vlan, u8 qos);
  740. * int (*ndo_set_vf_tx_rate)(struct net_device *dev, int vf, int rate);
  741. * int (*ndo_set_vf_spoofchk)(struct net_device *dev, int vf, bool setting);
  742. * int (*ndo_get_vf_config)(struct net_device *dev,
  743. * int vf, struct ifla_vf_info *ivf);
  744. * int (*ndo_set_vf_port)(struct net_device *dev, int vf,
  745. * struct nlattr *port[]);
  746. * int (*ndo_get_vf_port)(struct net_device *dev, int vf, struct sk_buff *skb);
  747. * int (*ndo_setup_tc)(struct net_device *dev, u8 tc)
  748. * Called to setup 'tc' number of traffic classes in the net device. This
  749. * is always called from the stack with the rtnl lock held and netif tx
  750. * queues stopped. This allows the netdevice to perform queue management
  751. * safely.
  752. *
  753. * Fiber Channel over Ethernet (FCoE) offload functions.
  754. * int (*ndo_fcoe_enable)(struct net_device *dev);
  755. * Called when the FCoE protocol stack wants to start using LLD for FCoE
  756. * so the underlying device can perform whatever needed configuration or
  757. * initialization to support acceleration of FCoE traffic.
  758. *
  759. * int (*ndo_fcoe_disable)(struct net_device *dev);
  760. * Called when the FCoE protocol stack wants to stop using LLD for FCoE
  761. * so the underlying device can perform whatever needed clean-ups to
  762. * stop supporting acceleration of FCoE traffic.
  763. *
  764. * int (*ndo_fcoe_ddp_setup)(struct net_device *dev, u16 xid,
  765. * struct scatterlist *sgl, unsigned int sgc);
  766. * Called when the FCoE Initiator wants to initialize an I/O that
  767. * is a possible candidate for Direct Data Placement (DDP). The LLD can
  768. * perform necessary setup and returns 1 to indicate the device is set up
  769. * successfully to perform DDP on this I/O, otherwise this returns 0.
  770. *
  771. * int (*ndo_fcoe_ddp_done)(struct net_device *dev, u16 xid);
  772. * Called when the FCoE Initiator/Target is done with the DDPed I/O as
  773. * indicated by the FC exchange id 'xid', so the underlying device can
  774. * clean up and reuse resources for later DDP requests.
  775. *
  776. * int (*ndo_fcoe_ddp_target)(struct net_device *dev, u16 xid,
  777. * struct scatterlist *sgl, unsigned int sgc);
  778. * Called when the FCoE Target wants to initialize an I/O that
  779. * is a possible candidate for Direct Data Placement (DDP). The LLD can
  780. * perform necessary setup and returns 1 to indicate the device is set up
  781. * successfully to perform DDP on this I/O, otherwise this returns 0.
  782. *
  783. * int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
  784. * struct netdev_fcoe_hbainfo *hbainfo);
  785. * Called when the FCoE Protocol stack wants information on the underlying
  786. * device. This information is utilized by the FCoE protocol stack to
  787. * register attributes with Fiber Channel management service as per the
  788. * FC-GS Fabric Device Management Information(FDMI) specification.
  789. *
  790. * int (*ndo_fcoe_get_wwn)(struct net_device *dev, u64 *wwn, int type);
  791. * Called when the underlying device wants to override default World Wide
  792. * Name (WWN) generation mechanism in FCoE protocol stack to pass its own
  793. * World Wide Port Name (WWPN) or World Wide Node Name (WWNN) to the FCoE
  794. * protocol stack to use.
  795. *
  796. * RFS acceleration.
  797. * int (*ndo_rx_flow_steer)(struct net_device *dev, const struct sk_buff *skb,
  798. * u16 rxq_index, u32 flow_id);
  799. * Set hardware filter for RFS. rxq_index is the target queue index;
  800. * flow_id is a flow ID to be passed to rps_may_expire_flow() later.
  801. * Return the filter ID on success, or a negative error code.
  802. *
  803. * Slave management functions (for bridge, bonding, etc). User should
  804. * call netdev_set_master() to set dev->master properly.
  805. * int (*ndo_add_slave)(struct net_device *dev, struct net_device *slave_dev);
  806. * Called to make another netdev an underling.
  807. *
  808. * int (*ndo_del_slave)(struct net_device *dev, struct net_device *slave_dev);
  809. * Called to release previously enslaved netdev.
  810. *
  811. * Feature/offload setting functions.
  812. * netdev_features_t (*ndo_fix_features)(struct net_device *dev,
  813. * netdev_features_t features);
  814. * Adjusts the requested feature flags according to device-specific
  815. * constraints, and returns the resulting flags. Must not modify
  816. * the device state.
  817. *
  818. * int (*ndo_set_features)(struct net_device *dev, netdev_features_t features);
  819. * Called to update device configuration to new features. Passed
  820. * feature set might be less than what was returned by ndo_fix_features()).
  821. * Must return >0 or -errno if it changed dev->features itself.
  822. *
  823. */
  824. struct net_device_ops {
  825. int (*ndo_init)(struct net_device *dev);
  826. void (*ndo_uninit)(struct net_device *dev);
  827. int (*ndo_open)(struct net_device *dev);
  828. int (*ndo_stop)(struct net_device *dev);
  829. netdev_tx_t (*ndo_start_xmit) (struct sk_buff *skb,
  830. struct net_device *dev);
  831. u16 (*ndo_select_queue)(struct net_device *dev,
  832. struct sk_buff *skb);
  833. void (*ndo_change_rx_flags)(struct net_device *dev,
  834. int flags);
  835. void (*ndo_set_rx_mode)(struct net_device *dev);
  836. int (*ndo_set_mac_address)(struct net_device *dev,
  837. void *addr);
  838. int (*ndo_validate_addr)(struct net_device *dev);
  839. int (*ndo_do_ioctl)(struct net_device *dev,
  840. struct ifreq *ifr, int cmd);
  841. int (*ndo_set_config)(struct net_device *dev,
  842. struct ifmap *map);
  843. int (*ndo_change_mtu)(struct net_device *dev,
  844. int new_mtu);
  845. int (*ndo_neigh_setup)(struct net_device *dev,
  846. struct neigh_parms *);
  847. void (*ndo_tx_timeout) (struct net_device *dev);
  848. struct rtnl_link_stats64* (*ndo_get_stats64)(struct net_device *dev,
  849. struct rtnl_link_stats64 *storage);
  850. struct net_device_stats* (*ndo_get_stats)(struct net_device *dev);
  851. int (*ndo_vlan_rx_add_vid)(struct net_device *dev,
  852. unsigned short vid);
  853. int (*ndo_vlan_rx_kill_vid)(struct net_device *dev,
  854. unsigned short vid);
  855. #ifdef CONFIG_NET_POLL_CONTROLLER
  856. void (*ndo_poll_controller)(struct net_device *dev);
  857. int (*ndo_netpoll_setup)(struct net_device *dev,
  858. struct netpoll_info *info);
  859. void (*ndo_netpoll_cleanup)(struct net_device *dev);
  860. #endif
  861. int (*ndo_set_vf_mac)(struct net_device *dev,
  862. int queue, u8 *mac);
  863. int (*ndo_set_vf_vlan)(struct net_device *dev,
  864. int queue, u16 vlan, u8 qos);
  865. int (*ndo_set_vf_tx_rate)(struct net_device *dev,
  866. int vf, int rate);
  867. int (*ndo_set_vf_spoofchk)(struct net_device *dev,
  868. int vf, bool setting);
  869. int (*ndo_get_vf_config)(struct net_device *dev,
  870. int vf,
  871. struct ifla_vf_info *ivf);
  872. int (*ndo_set_vf_port)(struct net_device *dev,
  873. int vf,
  874. struct nlattr *port[]);
  875. int (*ndo_get_vf_port)(struct net_device *dev,
  876. int vf, struct sk_buff *skb);
  877. int (*ndo_setup_tc)(struct net_device *dev, u8 tc);
  878. #if IS_ENABLED(CONFIG_FCOE)
  879. int (*ndo_fcoe_enable)(struct net_device *dev);
  880. int (*ndo_fcoe_disable)(struct net_device *dev);
  881. int (*ndo_fcoe_ddp_setup)(struct net_device *dev,
  882. u16 xid,
  883. struct scatterlist *sgl,
  884. unsigned int sgc);
  885. int (*ndo_fcoe_ddp_done)(struct net_device *dev,
  886. u16 xid);
  887. int (*ndo_fcoe_ddp_target)(struct net_device *dev,
  888. u16 xid,
  889. struct scatterlist *sgl,
  890. unsigned int sgc);
  891. int (*ndo_fcoe_get_hbainfo)(struct net_device *dev,
  892. struct netdev_fcoe_hbainfo *hbainfo);
  893. #endif
  894. #if IS_ENABLED(CONFIG_LIBFCOE)
  895. #define NETDEV_FCOE_WWNN 0
  896. #define NETDEV_FCOE_WWPN 1
  897. int (*ndo_fcoe_get_wwn)(struct net_device *dev,
  898. u64 *wwn, int type);
  899. #endif
  900. #ifdef CONFIG_RFS_ACCEL
  901. int (*ndo_rx_flow_steer)(struct net_device *dev,
  902. const struct sk_buff *skb,
  903. u16 rxq_index,
  904. u32 flow_id);
  905. #endif
  906. int (*ndo_add_slave)(struct net_device *dev,
  907. struct net_device *slave_dev);
  908. int (*ndo_del_slave)(struct net_device *dev,
  909. struct net_device *slave_dev);
  910. netdev_features_t (*ndo_fix_features)(struct net_device *dev,
  911. netdev_features_t features);
  912. int (*ndo_set_features)(struct net_device *dev,
  913. netdev_features_t features);
  914. int (*ndo_neigh_construct)(struct neighbour *n);
  915. void (*ndo_neigh_destroy)(struct neighbour *n);
  916. };
  917. /*
  918. * The DEVICE structure.
  919. * Actually, this whole structure is a big mistake. It mixes I/O
  920. * data with strictly "high-level" data, and it has to know about
  921. * almost every data structure used in the INET module.
  922. *
  923. * FIXME: cleanup struct net_device such that network protocol info
  924. * moves out.
  925. */
  926. struct net_device {
  927. /*
  928. * This is the first field of the "visible" part of this structure
  929. * (i.e. as seen by users in the "Space.c" file). It is the name
  930. * of the interface.
  931. */
  932. char name[IFNAMSIZ];
  933. struct pm_qos_request pm_qos_req;
  934. /* device name hash chain */
  935. struct hlist_node name_hlist;
  936. /* snmp alias */
  937. char *ifalias;
  938. /*
  939. * I/O specific fields
  940. * FIXME: Merge these and struct ifmap into one
  941. */
  942. unsigned long mem_end; /* shared mem end */
  943. unsigned long mem_start; /* shared mem start */
  944. unsigned long base_addr; /* device I/O address */
  945. unsigned int irq; /* device IRQ number */
  946. /*
  947. * Some hardware also needs these fields, but they are not
  948. * part of the usual set specified in Space.c.
  949. */
  950. unsigned long state;
  951. struct list_head dev_list;
  952. struct list_head napi_list;
  953. struct list_head unreg_list;
  954. /* currently active device features */
  955. netdev_features_t features;
  956. /* user-changeable features */
  957. netdev_features_t hw_features;
  958. /* user-requested features */
  959. netdev_features_t wanted_features;
  960. /* mask of features inheritable by VLAN devices */
  961. netdev_features_t vlan_features;
  962. /* Interface index. Unique device identifier */
  963. int ifindex;
  964. int iflink;
  965. struct net_device_stats stats;
  966. atomic_long_t rx_dropped; /* dropped packets by core network
  967. * Do not use this in drivers.
  968. */
  969. #ifdef CONFIG_WIRELESS_EXT
  970. /* List of functions to handle Wireless Extensions (instead of ioctl).
  971. * See <net/iw_handler.h> for details. Jean II */
  972. const struct iw_handler_def * wireless_handlers;
  973. /* Instance data managed by the core of Wireless Extensions. */
  974. struct iw_public_data * wireless_data;
  975. #endif
  976. /* Management operations */
  977. const struct net_device_ops *netdev_ops;
  978. const struct ethtool_ops *ethtool_ops;
  979. /* Hardware header description */
  980. const struct header_ops *header_ops;
  981. unsigned int flags; /* interface flags (a la BSD) */
  982. unsigned int priv_flags; /* Like 'flags' but invisible to userspace.
  983. * See if.h for definitions. */
  984. unsigned short gflags;
  985. unsigned short padded; /* How much padding added by alloc_netdev() */
  986. unsigned char operstate; /* RFC2863 operstate */
  987. unsigned char link_mode; /* mapping policy to operstate */
  988. unsigned char if_port; /* Selectable AUI, TP,..*/
  989. unsigned char dma; /* DMA channel */
  990. unsigned int mtu; /* interface MTU value */
  991. unsigned short type; /* interface hardware type */
  992. unsigned short hard_header_len; /* hardware hdr length */
  993. /* extra head- and tailroom the hardware may need, but not in all cases
  994. * can this be guaranteed, especially tailroom. Some cases also use
  995. * LL_MAX_HEADER instead to allocate the skb.
  996. */
  997. unsigned short needed_headroom;
  998. unsigned short needed_tailroom;
  999. /* Interface address info. */
  1000. unsigned char perm_addr[MAX_ADDR_LEN]; /* permanent hw address */
  1001. unsigned char addr_assign_type; /* hw address assignment type */
  1002. unsigned char addr_len; /* hardware address length */
  1003. unsigned char neigh_priv_len;
  1004. unsigned short dev_id; /* for shared network cards */
  1005. spinlock_t addr_list_lock;
  1006. struct netdev_hw_addr_list uc; /* Unicast mac addresses */
  1007. struct netdev_hw_addr_list mc; /* Multicast mac addresses */
  1008. bool uc_promisc;
  1009. unsigned int promiscuity;
  1010. unsigned int allmulti;
  1011. /* Protocol specific pointers */
  1012. #if IS_ENABLED(CONFIG_VLAN_8021Q)
  1013. struct vlan_info __rcu *vlan_info; /* VLAN info */
  1014. #endif
  1015. #if IS_ENABLED(CONFIG_NET_DSA)
  1016. struct dsa_switch_tree *dsa_ptr; /* dsa specific data */
  1017. #endif
  1018. void *atalk_ptr; /* AppleTalk link */
  1019. struct in_device __rcu *ip_ptr; /* IPv4 specific data */
  1020. struct dn_dev __rcu *dn_ptr; /* DECnet specific data */
  1021. struct inet6_dev __rcu *ip6_ptr; /* IPv6 specific data */
  1022. void *ec_ptr; /* Econet specific data */
  1023. void *ax25_ptr; /* AX.25 specific data */
  1024. struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
  1025. assign before registering */
  1026. /*
  1027. * Cache lines mostly used on receive path (including eth_type_trans())
  1028. */
  1029. unsigned long last_rx; /* Time of last Rx
  1030. * This should not be set in
  1031. * drivers, unless really needed,
  1032. * because network stack (bonding)
  1033. * use it if/when necessary, to
  1034. * avoid dirtying this cache line.
  1035. */
  1036. struct net_device *master; /* Pointer to master device of a group,
  1037. * which this device is member of.
  1038. */
  1039. /* Interface address info used in eth_type_trans() */
  1040. unsigned char *dev_addr; /* hw address, (before bcast
  1041. because most packets are
  1042. unicast) */
  1043. struct netdev_hw_addr_list dev_addrs; /* list of device
  1044. hw addresses */
  1045. unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
  1046. #ifdef CONFIG_SYSFS
  1047. struct kset *queues_kset;
  1048. #endif
  1049. #ifdef CONFIG_RPS
  1050. struct netdev_rx_queue *_rx;
  1051. /* Number of RX queues allocated at register_netdev() time */
  1052. unsigned int num_rx_queues;
  1053. /* Number of RX queues currently active in device */
  1054. unsigned int real_num_rx_queues;
  1055. #ifdef CONFIG_RFS_ACCEL
  1056. /* CPU reverse-mapping for RX completion interrupts, indexed
  1057. * by RX queue number. Assigned by driver. This must only be
  1058. * set if the ndo_rx_flow_steer operation is defined. */
  1059. struct cpu_rmap *rx_cpu_rmap;
  1060. #endif
  1061. #endif
  1062. rx_handler_func_t __rcu *rx_handler;
  1063. void __rcu *rx_handler_data;
  1064. struct netdev_queue __rcu *ingress_queue;
  1065. /*
  1066. * Cache lines mostly used on transmit path
  1067. */
  1068. struct netdev_queue *_tx ____cacheline_aligned_in_smp;
  1069. /* Number of TX queues allocated at alloc_netdev_mq() time */
  1070. unsigned int num_tx_queues;
  1071. /* Number of TX queues currently active in device */
  1072. unsigned int real_num_tx_queues;
  1073. /* root qdisc from userspace point of view */
  1074. struct Qdisc *qdisc;
  1075. unsigned long tx_queue_len; /* Max frames per queue allowed */
  1076. spinlock_t tx_global_lock;
  1077. #ifdef CONFIG_XPS
  1078. struct xps_dev_maps __rcu *xps_maps;
  1079. #endif
  1080. /* These may be needed for future network-power-down code. */
  1081. /*
  1082. * trans_start here is expensive for high speed devices on SMP,
  1083. * please use netdev_queue->trans_start instead.
  1084. */
  1085. unsigned long trans_start; /* Time (in jiffies) of last Tx */
  1086. int watchdog_timeo; /* used by dev_watchdog() */
  1087. struct timer_list watchdog_timer;
  1088. /* Number of references to this device */
  1089. int __percpu *pcpu_refcnt;
  1090. /* delayed register/unregister */
  1091. struct list_head todo_list;
  1092. /* device index hash chain */
  1093. struct hlist_node index_hlist;
  1094. struct list_head link_watch_list;
  1095. /* register/unregister state machine */
  1096. enum { NETREG_UNINITIALIZED=0,
  1097. NETREG_REGISTERED, /* completed register_netdevice */
  1098. NETREG_UNREGISTERING, /* called unregister_netdevice */
  1099. NETREG_UNREGISTERED, /* completed unregister todo */
  1100. NETREG_RELEASED, /* called free_netdev */
  1101. NETREG_DUMMY, /* dummy device for NAPI poll */
  1102. } reg_state:8;
  1103. bool dismantle; /* device is going do be freed */
  1104. enum {
  1105. RTNL_LINK_INITIALIZED,
  1106. RTNL_LINK_INITIALIZING,
  1107. } rtnl_link_state:16;
  1108. /* Called from unregister, can be used to call free_netdev */
  1109. void (*destructor)(struct net_device *dev);
  1110. #ifdef CONFIG_NETPOLL
  1111. struct netpoll_info *npinfo;
  1112. #endif
  1113. #ifdef CONFIG_NET_NS
  1114. /* Network namespace this network device is inside */
  1115. struct net *nd_net;
  1116. #endif
  1117. /* mid-layer private */
  1118. union {
  1119. void *ml_priv;
  1120. struct pcpu_lstats __percpu *lstats; /* loopback stats */
  1121. struct pcpu_tstats __percpu *tstats; /* tunnel stats */
  1122. struct pcpu_dstats __percpu *dstats; /* dummy stats */
  1123. };
  1124. /* GARP */
  1125. struct garp_port __rcu *garp_port;
  1126. /* class/net/name entry */
  1127. struct device dev;
  1128. /* space for optional device, statistics, and wireless sysfs groups */
  1129. const struct attribute_group *sysfs_groups[4];
  1130. /* rtnetlink link ops */
  1131. const struct rtnl_link_ops *rtnl_link_ops;
  1132. /* for setting kernel sock attribute on TCP connection setup */
  1133. #define GSO_MAX_SIZE 65536
  1134. unsigned int gso_max_size;
  1135. #ifdef CONFIG_DCB
  1136. /* Data Center Bridging netlink ops */
  1137. const struct dcbnl_rtnl_ops *dcbnl_ops;
  1138. #endif
  1139. u8 num_tc;
  1140. struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];
  1141. u8 prio_tc_map[TC_BITMASK + 1];
  1142. #if IS_ENABLED(CONFIG_FCOE)
  1143. /* max exchange id for FCoE LRO by ddp */
  1144. unsigned int fcoe_ddp_xid;
  1145. #endif
  1146. #if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
  1147. struct netprio_map __rcu *priomap;
  1148. #endif
  1149. /* phy device may attach itself for hardware timestamping */
  1150. struct phy_device *phydev;
  1151. /* group the device belongs to */
  1152. int group;
  1153. };
  1154. #define to_net_dev(d) container_of(d, struct net_device, dev)
  1155. #define NETDEV_ALIGN 32
  1156. static inline
  1157. int netdev_get_prio_tc_map(const struct net_device *dev, u32 prio)
  1158. {
  1159. return dev->prio_tc_map[prio & TC_BITMASK];
  1160. }
  1161. static inline
  1162. int netdev_set_prio_tc_map(struct net_device *dev, u8 prio, u8 tc)
  1163. {
  1164. if (tc >= dev->num_tc)
  1165. return -EINVAL;
  1166. dev->prio_tc_map[prio & TC_BITMASK] = tc & TC_BITMASK;
  1167. return 0;
  1168. }
  1169. static inline
  1170. void netdev_reset_tc(struct net_device *dev)
  1171. {
  1172. dev->num_tc = 0;
  1173. memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq));
  1174. memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map));
  1175. }
  1176. static inline
  1177. int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset)
  1178. {
  1179. if (tc >= dev->num_tc)
  1180. return -EINVAL;
  1181. dev->tc_to_txq[tc].count = count;
  1182. dev->tc_to_txq[tc].offset = offset;
  1183. return 0;
  1184. }
  1185. static inline
  1186. int netdev_set_num_tc(struct net_device *dev, u8 num_tc)
  1187. {
  1188. if (num_tc > TC_MAX_QUEUE)
  1189. return -EINVAL;
  1190. dev->num_tc = num_tc;
  1191. return 0;
  1192. }
  1193. static inline
  1194. int netdev_get_num_tc(struct net_device *dev)
  1195. {
  1196. return dev->num_tc;
  1197. }
  1198. static inline
  1199. struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
  1200. unsigned int index)
  1201. {
  1202. return &dev->_tx[index];
  1203. }
  1204. static inline void netdev_for_each_tx_queue(struct net_device *dev,
  1205. void (*f)(struct net_device *,
  1206. struct netdev_queue *,
  1207. void *),
  1208. void *arg)
  1209. {
  1210. unsigned int i;
  1211. for (i = 0; i < dev->num_tx_queues; i++)
  1212. f(dev, &dev->_tx[i], arg);
  1213. }
  1214. /*
  1215. * Net namespace inlines
  1216. */
  1217. static inline
  1218. struct net *dev_net(const struct net_device *dev)
  1219. {
  1220. return read_pnet(&dev->nd_net);
  1221. }
  1222. static inline
  1223. void dev_net_set(struct net_device *dev, struct net *net)
  1224. {
  1225. #ifdef CONFIG_NET_NS
  1226. release_net(dev->nd_net);
  1227. dev->nd_net = hold_net(net);
  1228. #endif
  1229. }
  1230. static inline bool netdev_uses_dsa_tags(struct net_device *dev)
  1231. {
  1232. #ifdef CONFIG_NET_DSA_TAG_DSA
  1233. if (dev->dsa_ptr != NULL)
  1234. return dsa_uses_dsa_tags(dev->dsa_ptr);
  1235. #endif
  1236. return 0;
  1237. }
  1238. #ifndef CONFIG_NET_NS
  1239. static inline void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
  1240. {
  1241. skb->dev = dev;
  1242. }
  1243. #else /* CONFIG_NET_NS */
  1244. void skb_set_dev(struct sk_buff *skb, struct net_device *dev);
  1245. #endif
  1246. static inline bool netdev_uses_trailer_tags(struct net_device *dev)
  1247. {
  1248. #ifdef CONFIG_NET_DSA_TAG_TRAILER
  1249. if (dev->dsa_ptr != NULL)
  1250. return dsa_uses_trailer_tags(dev->dsa_ptr);
  1251. #endif
  1252. return 0;
  1253. }
  1254. /**
  1255. * netdev_priv - access network device private data
  1256. * @dev: network device
  1257. *
  1258. * Get network device private data
  1259. */
  1260. static inline void *netdev_priv(const struct net_device *dev)
  1261. {
  1262. return (char *)dev + ALIGN(sizeof(struct net_device), NETDEV_ALIGN);
  1263. }
  1264. /* Set the sysfs physical device reference for the network logical device
  1265. * if set prior to registration will cause a symlink during initialization.
  1266. */
  1267. #define SET_NETDEV_DEV(net, pdev) ((net)->dev.parent = (pdev))
  1268. /* Set the sysfs device type for the network logical device to allow
  1269. * fin grained indentification of different network device types. For
  1270. * example Ethernet, Wirelss LAN, Bluetooth, WiMAX etc.
  1271. */
  1272. #define SET_NETDEV_DEVTYPE(net, devtype) ((net)->dev.type = (devtype))
  1273. /**
  1274. * netif_napi_add - initialize a napi context
  1275. * @dev: network device
  1276. * @napi: napi context
  1277. * @poll: polling function
  1278. * @weight: default weight
  1279. *
  1280. * netif_napi_add() must be used to initialize a napi context prior to calling
  1281. * *any* of the other napi related functions.
  1282. */
  1283. void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
  1284. int (*poll)(struct napi_struct *, int), int weight);
  1285. /**
  1286. * netif_napi_del - remove a napi context
  1287. * @napi: napi context
  1288. *
  1289. * netif_napi_del() removes a napi context from the network device napi list
  1290. */
  1291. void netif_napi_del(struct napi_struct *napi);
  1292. struct napi_gro_cb {
  1293. /* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
  1294. void *frag0;
  1295. /* Length of frag0. */
  1296. unsigned int frag0_len;
  1297. /* This indicates where we are processing relative to skb->data. */
  1298. int data_offset;
  1299. /* This is non-zero if the packet may be of the same flow. */
  1300. int same_flow;
  1301. /* This is non-zero if the packet cannot be merged with the new skb. */
  1302. int flush;
  1303. /* Number of segments aggregated. */
  1304. int count;
  1305. /* Free the skb? */
  1306. int free;
  1307. };
  1308. #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
  1309. struct packet_type {
  1310. __be16 type; /* This is really htons(ether_type). */
  1311. struct net_device *dev; /* NULL is wildcarded here */
  1312. int (*func) (struct sk_buff *,
  1313. struct net_device *,
  1314. struct packet_type *,
  1315. struct net_device *);
  1316. struct sk_buff *(*gso_segment)(struct sk_buff *skb,
  1317. netdev_features_t features);
  1318. int (*gso_send_check)(struct sk_buff *skb);
  1319. struct sk_buff **(*gro_receive)(struct sk_buff **head,
  1320. struct sk_buff *skb);
  1321. int (*gro_complete)(struct sk_buff *skb);
  1322. void *af_packet_priv;
  1323. struct list_head list;
  1324. };
  1325. #include <linux/notifier.h>
  1326. /* netdevice notifier chain. Please remember to update the rtnetlink
  1327. * notification exclusion list in rtnetlink_event() when adding new
  1328. * types.
  1329. */
  1330. #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
  1331. #define NETDEV_DOWN 0x0002
  1332. #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
  1333. detected a hardware crash and restarted
  1334. - we can use this eg to kick tcp sessions
  1335. once done */
  1336. #define NETDEV_CHANGE 0x0004 /* Notify device state change */
  1337. #define NETDEV_REGISTER 0x0005
  1338. #define NETDEV_UNREGISTER 0x0006
  1339. #define NETDEV_CHANGEMTU 0x0007
  1340. #define NETDEV_CHANGEADDR 0x0008
  1341. #define NETDEV_GOING_DOWN 0x0009
  1342. #define NETDEV_CHANGENAME 0x000A
  1343. #define NETDEV_FEAT_CHANGE 0x000B
  1344. #define NETDEV_BONDING_FAILOVER 0x000C
  1345. #define NETDEV_PRE_UP 0x000D
  1346. #define NETDEV_PRE_TYPE_CHANGE 0x000E
  1347. #define NETDEV_POST_TYPE_CHANGE 0x000F
  1348. #define NETDEV_POST_INIT 0x0010
  1349. #define NETDEV_UNREGISTER_BATCH 0x0011
  1350. #define NETDEV_RELEASE 0x0012
  1351. #define NETDEV_NOTIFY_PEERS 0x0013
  1352. #define NETDEV_JOIN 0x0014
  1353. extern int register_netdevice_notifier(struct notifier_block *nb);
  1354. extern int unregister_netdevice_notifier(struct notifier_block *nb);
  1355. extern int call_netdevice_notifiers(unsigned long val, struct net_device *dev);
  1356. extern rwlock_t dev_base_lock; /* Device list lock */
  1357. #define for_each_netdev(net, d) \
  1358. list_for_each_entry(d, &(net)->dev_base_head, dev_list)
  1359. #define for_each_netdev_reverse(net, d) \
  1360. list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
  1361. #define for_each_netdev_rcu(net, d) \
  1362. list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
  1363. #define for_each_netdev_safe(net, d, n) \
  1364. list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
  1365. #define for_each_netdev_continue(net, d) \
  1366. list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
  1367. #define for_each_netdev_continue_rcu(net, d) \
  1368. list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
  1369. #define net_device_entry(lh) list_entry(lh, struct net_device, dev_list)
  1370. static inline struct net_device *next_net_device(struct net_device *dev)
  1371. {
  1372. struct list_head *lh;
  1373. struct net *net;
  1374. net = dev_net(dev);
  1375. lh = dev->dev_list.next;
  1376. return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  1377. }
  1378. static inline struct net_device *next_net_device_rcu(struct net_device *dev)
  1379. {
  1380. struct list_head *lh;
  1381. struct net *net;
  1382. net = dev_net(dev);
  1383. lh = rcu_dereference(list_next_rcu(&dev->dev_list));
  1384. return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  1385. }
  1386. static inline struct net_device *first_net_device(struct net *net)
  1387. {
  1388. return list_empty(&net->dev_base_head) ? NULL :
  1389. net_device_entry(net->dev_base_head.next);
  1390. }
  1391. static inline struct net_device *first_net_device_rcu(struct net *net)
  1392. {
  1393. struct list_head *lh = rcu_dereference(list_next_rcu(&net->dev_base_head));
  1394. return lh == &net->dev_base_head ? NULL : net_device_entry(lh);
  1395. }
  1396. extern int netdev_boot_setup_check(struct net_device *dev);
  1397. extern unsigned long netdev_boot_base(const char *prefix, int unit);
  1398. extern struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
  1399. const char *hwaddr);
  1400. extern struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type);
  1401. extern struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type);
  1402. extern void dev_add_pack(struct packet_type *pt);
  1403. extern void dev_remove_pack(struct packet_type *pt);
  1404. extern void __dev_remove_pack(struct packet_type *pt);
  1405. extern struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short flags,
  1406. unsigned short mask);
  1407. extern struct net_device *dev_get_by_name(struct net *net, const char *name);
  1408. extern struct net_device *dev_get_by_name_rcu(struct net *net, const char *name);
  1409. extern struct net_device *__dev_get_by_name(struct net *net, const char *name);
  1410. extern int dev_alloc_name(struct net_device *dev, const char *name);
  1411. extern int dev_open(struct net_device *dev);
  1412. extern int dev_close(struct net_device *dev);
  1413. extern void dev_disable_lro(struct net_device *dev);
  1414. extern int dev_queue_xmit(struct sk_buff *skb);
  1415. extern int register_netdevice(struct net_device *dev);
  1416. extern void unregister_netdevice_queue(struct net_device *dev,
  1417. struct list_head *head);
  1418. extern void unregister_netdevice_many(struct list_head *head);
  1419. static inline void unregister_netdevice(struct net_device *dev)
  1420. {
  1421. unregister_netdevice_queue(dev, NULL);
  1422. }
  1423. extern int netdev_refcnt_read(const struct net_device *dev);
  1424. extern void free_netdev(struct net_device *dev);
  1425. extern void synchronize_net(void);
  1426. extern int init_dummy_netdev(struct net_device *dev);
  1427. extern void netdev_resync_ops(struct net_device *dev);
  1428. extern struct net_device *dev_get_by_index(struct net *net, int ifindex);
  1429. extern struct net_device *__dev_get_by_index(struct net *net, int ifindex);
  1430. extern struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);
  1431. extern int dev_restart(struct net_device *dev);
  1432. #ifdef CONFIG_NETPOLL_TRAP
  1433. extern int netpoll_trap(void);
  1434. #endif
  1435. extern int skb_gro_receive(struct sk_buff **head,
  1436. struct sk_buff *skb);
  1437. extern void skb_gro_reset_offset(struct sk_buff *skb);
  1438. static inline unsigned int skb_gro_offset(const struct sk_buff *skb)
  1439. {
  1440. return NAPI_GRO_CB(skb)->data_offset;
  1441. }
  1442. static inline unsigned int skb_gro_len(const struct sk_buff *skb)
  1443. {
  1444. return skb->len - NAPI_GRO_CB(skb)->data_offset;
  1445. }
  1446. static inline void skb_gro_pull(struct sk_buff *skb, unsigned int len)
  1447. {
  1448. NAPI_GRO_CB(skb)->data_offset += len;
  1449. }
  1450. static inline void *skb_gro_header_fast(struct sk_buff *skb,
  1451. unsigned int offset)
  1452. {
  1453. return NAPI_GRO_CB(skb)->frag0 + offset;
  1454. }
  1455. static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
  1456. {
  1457. return NAPI_GRO_CB(skb)->frag0_len < hlen;
  1458. }
  1459. static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
  1460. unsigned int offset)
  1461. {
  1462. if (!pskb_may_pull(skb, hlen))
  1463. return NULL;
  1464. NAPI_GRO_CB(skb)->frag0 = NULL;
  1465. NAPI_GRO_CB(skb)->frag0_len = 0;
  1466. return skb->data + offset;
  1467. }
  1468. static inline void *skb_gro_mac_header(struct sk_buff *skb)
  1469. {
  1470. return NAPI_GRO_CB(skb)->frag0 ?: skb_mac_header(skb);
  1471. }
  1472. static inline void *skb_gro_network_header(struct sk_buff *skb)
  1473. {
  1474. return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +
  1475. skb_network_offset(skb);
  1476. }
  1477. static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
  1478. unsigned short type,
  1479. const void *daddr, const void *saddr,
  1480. unsigned len)
  1481. {
  1482. if (!dev->header_ops || !dev->header_ops->create)
  1483. return 0;
  1484. return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
  1485. }
  1486. static inline int dev_parse_header(const struct sk_buff *skb,
  1487. unsigned char *haddr)
  1488. {
  1489. const struct net_device *dev = skb->dev;
  1490. if (!dev->header_ops || !dev->header_ops->parse)
  1491. return 0;
  1492. return dev->header_ops->parse(skb, haddr);
  1493. }
  1494. typedef int gifconf_func_t(struct net_device * dev, char __user * bufptr, int len);
  1495. extern int register_gifconf(unsigned int family, gifconf_func_t * gifconf);
  1496. static inline int unregister_gifconf(unsigned int family)
  1497. {
  1498. return register_gifconf(family, NULL);
  1499. }
  1500. /*
  1501. * Incoming packets are placed on per-cpu queues
  1502. */
  1503. struct softnet_data {
  1504. struct Qdisc *output_queue;
  1505. struct Qdisc **output_queue_tailp;
  1506. struct list_head poll_list;
  1507. struct sk_buff *completion_queue;
  1508. struct sk_buff_head process_queue;
  1509. /* stats */
  1510. unsigned int processed;
  1511. unsigned int time_squeeze;
  1512. unsigned int cpu_collision;
  1513. unsigned int received_rps;
  1514. #ifdef CONFIG_RPS
  1515. struct softnet_data *rps_ipi_list;
  1516. /* Elements below can be accessed between CPUs for RPS */
  1517. struct call_single_data csd ____cacheline_aligned_in_smp;
  1518. struct softnet_data *rps_ipi_next;
  1519. unsigned int cpu;
  1520. unsigned int input_queue_head;
  1521. unsigned int input_queue_tail;
  1522. #endif
  1523. unsigned dropped;
  1524. struct sk_buff_head input_pkt_queue;
  1525. struct napi_struct backlog;
  1526. };
  1527. static inline void input_queue_head_incr(struct softnet_data *sd)
  1528. {
  1529. #ifdef CONFIG_RPS
  1530. sd->input_queue_head++;
  1531. #endif
  1532. }
  1533. static inline void input_queue_tail_incr_save(struct softnet_data *sd,
  1534. unsigned int *qtail)
  1535. {
  1536. #ifdef CONFIG_RPS
  1537. *qtail = ++sd->input_queue_tail;
  1538. #endif
  1539. }
  1540. DECLARE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
  1541. extern void __netif_schedule(struct Qdisc *q);
  1542. static inline void netif_schedule_queue(struct netdev_queue *txq)
  1543. {
  1544. if (!(txq->state & QUEUE_STATE_ANY_XOFF))
  1545. __netif_schedule(txq->qdisc);
  1546. }
  1547. static inline void netif_tx_schedule_all(struct net_device *dev)
  1548. {
  1549. unsigned int i;
  1550. for (i = 0; i < dev->num_tx_queues; i++)
  1551. netif_schedule_queue(netdev_get_tx_queue(dev, i));
  1552. }
  1553. static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
  1554. {
  1555. clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  1556. }
  1557. /**
  1558. * netif_start_queue - allow transmit
  1559. * @dev: network device
  1560. *
  1561. * Allow upper layers to call the device hard_start_xmit routine.
  1562. */
  1563. static inline void netif_start_queue(struct net_device *dev)
  1564. {
  1565. netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
  1566. }
  1567. static inline void netif_tx_start_all_queues(struct net_device *dev)
  1568. {
  1569. unsigned int i;
  1570. for (i = 0; i < dev->num_tx_queues; i++) {
  1571. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  1572. netif_tx_start_queue(txq);
  1573. }
  1574. }
  1575. static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
  1576. {
  1577. #ifdef CONFIG_NETPOLL_TRAP
  1578. if (netpoll_trap()) {
  1579. netif_tx_start_queue(dev_queue);
  1580. return;
  1581. }
  1582. #endif
  1583. if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state))
  1584. __netif_schedule(dev_queue->qdisc);
  1585. }
  1586. /**
  1587. * netif_wake_queue - restart transmit
  1588. * @dev: network device
  1589. *
  1590. * Allow upper layers to call the device hard_start_xmit routine.
  1591. * Used for flow control when transmit resources are available.
  1592. */
  1593. static inline void netif_wake_queue(struct net_device *dev)
  1594. {
  1595. netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
  1596. }
  1597. static inline void netif_tx_wake_all_queues(struct net_device *dev)
  1598. {
  1599. unsigned int i;
  1600. for (i = 0; i < dev->num_tx_queues; i++) {
  1601. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  1602. netif_tx_wake_queue(txq);
  1603. }
  1604. }
  1605. static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
  1606. {
  1607. if (WARN_ON(!dev_queue)) {
  1608. pr_info("netif_stop_queue() cannot be called before register_netdev()\n");
  1609. return;
  1610. }
  1611. set_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  1612. }
  1613. /**
  1614. * netif_stop_queue - stop transmitted packets
  1615. * @dev: network device
  1616. *
  1617. * Stop upper layers calling the device hard_start_xmit routine.
  1618. * Used for flow control when transmit resources are unavailable.
  1619. */
  1620. static inline void netif_stop_queue(struct net_device *dev)
  1621. {
  1622. netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
  1623. }
  1624. static inline void netif_tx_stop_all_queues(struct net_device *dev)
  1625. {
  1626. unsigned int i;
  1627. for (i = 0; i < dev->num_tx_queues; i++) {
  1628. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  1629. netif_tx_stop_queue(txq);
  1630. }
  1631. }
  1632. static inline bool netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
  1633. {
  1634. return test_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state);
  1635. }
  1636. /**
  1637. * netif_queue_stopped - test if transmit queue is flowblocked
  1638. * @dev: network device
  1639. *
  1640. * Test if transmit queue on device is currently unable to send.
  1641. */
  1642. static inline bool netif_queue_stopped(const struct net_device *dev)
  1643. {
  1644. return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
  1645. }
  1646. static inline bool netif_xmit_stopped(const struct netdev_queue *dev_queue)
  1647. {
  1648. return dev_queue->state & QUEUE_STATE_ANY_XOFF;
  1649. }
  1650. static inline bool netif_xmit_frozen_or_stopped(const struct netdev_queue *dev_queue)
  1651. {
  1652. return dev_queue->state & QUEUE_STATE_ANY_XOFF_OR_FROZEN;
  1653. }
  1654. static inline void netdev_tx_sent_queue(struct netdev_queue *dev_queue,
  1655. unsigned int bytes)
  1656. {
  1657. #ifdef CONFIG_BQL
  1658. dql_queued(&dev_queue->dql, bytes);
  1659. if (likely(dql_avail(&dev_queue->dql) >= 0))
  1660. return;
  1661. set_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
  1662. /*
  1663. * The XOFF flag must be set before checking the dql_avail below,
  1664. * because in netdev_tx_completed_queue we update the dql_completed
  1665. * before checking the XOFF flag.
  1666. */
  1667. smp_mb();
  1668. /* check again in case another CPU has just made room avail */
  1669. if (unlikely(dql_avail(&dev_queue->dql) >= 0))
  1670. clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state);
  1671. #endif
  1672. }
  1673. static inline void netdev_sent_queue(struct net_device *dev, unsigned int bytes)
  1674. {
  1675. netdev_tx_sent_queue(netdev_get_tx_queue(dev, 0), bytes);
  1676. }
  1677. static inline void netdev_tx_completed_queue(struct netdev_queue *dev_queue,
  1678. unsigned pkts, unsigned bytes)
  1679. {
  1680. #ifdef CONFIG_BQL
  1681. if (unlikely(!bytes))
  1682. return;
  1683. dql_completed(&dev_queue->dql, bytes);
  1684. /*
  1685. * Without the memory barrier there is a small possiblity that
  1686. * netdev_tx_sent_queue will miss the update and cause the queue to
  1687. * be stopped forever
  1688. */
  1689. smp_mb();
  1690. if (dql_avail(&dev_queue->dql) < 0)
  1691. return;
  1692. if (test_and_clear_bit(__QUEUE_STATE_STACK_XOFF, &dev_queue->state))
  1693. netif_schedule_queue(dev_queue);
  1694. #endif
  1695. }
  1696. static inline void netdev_completed_queue(struct net_device *dev,
  1697. unsigned pkts, unsigned bytes)
  1698. {
  1699. netdev_tx_completed_queue(netdev_get_tx_queue(dev, 0), pkts, bytes);
  1700. }
  1701. static inline void netdev_tx_reset_queue(struct netdev_queue *q)
  1702. {
  1703. #ifdef CONFIG_BQL
  1704. clear_bit(__QUEUE_STATE_STACK_XOFF, &q->state);
  1705. dql_reset(&q->dql);
  1706. #endif
  1707. }
  1708. static inline void netdev_reset_queue(struct net_device *dev_queue)
  1709. {
  1710. netdev_tx_reset_queue(netdev_get_tx_queue(dev_queue, 0));
  1711. }
  1712. /**
  1713. * netif_running - test if up
  1714. * @dev: network device
  1715. *
  1716. * Test if the device has been brought up.
  1717. */
  1718. static inline bool netif_running(const struct net_device *dev)
  1719. {
  1720. return test_bit(__LINK_STATE_START, &dev->state);
  1721. }
  1722. /*
  1723. * Routines to manage the subqueues on a device. We only need start
  1724. * stop, and a check if it's stopped. All other device management is
  1725. * done at the overall netdevice level.
  1726. * Also test the device if we're multiqueue.
  1727. */
  1728. /**
  1729. * netif_start_subqueue - allow sending packets on subqueue
  1730. * @dev: network device
  1731. * @queue_index: sub queue index
  1732. *
  1733. * Start individual transmit queue of a device with multiple transmit queues.
  1734. */
  1735. static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
  1736. {
  1737. struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  1738. netif_tx_start_queue(txq);
  1739. }
  1740. /**
  1741. * netif_stop_subqueue - stop sending packets on subqueue
  1742. * @dev: network device
  1743. * @queue_index: sub queue index
  1744. *
  1745. * Stop individual transmit queue of a device with multiple transmit queues.
  1746. */
  1747. static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
  1748. {
  1749. struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  1750. #ifdef CONFIG_NETPOLL_TRAP
  1751. if (netpoll_trap())
  1752. return;
  1753. #endif
  1754. netif_tx_stop_queue(txq);
  1755. }
  1756. /**
  1757. * netif_subqueue_stopped - test status of subqueue
  1758. * @dev: network device
  1759. * @queue_index: sub queue index
  1760. *
  1761. * Check individual transmit queue of a device with multiple transmit queues.
  1762. */
  1763. static inline bool __netif_subqueue_stopped(const struct net_device *dev,
  1764. u16 queue_index)
  1765. {
  1766. struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  1767. return netif_tx_queue_stopped(txq);
  1768. }
  1769. static inline bool netif_subqueue_stopped(const struct net_device *dev,
  1770. struct sk_buff *skb)
  1771. {
  1772. return __netif_subqueue_stopped(dev, skb_get_queue_mapping(skb));
  1773. }
  1774. /**
  1775. * netif_wake_subqueue - allow sending packets on subqueue
  1776. * @dev: network device
  1777. * @queue_index: sub queue index
  1778. *
  1779. * Resume individual transmit queue of a device with multiple transmit queues.
  1780. */
  1781. static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
  1782. {
  1783. struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
  1784. #ifdef CONFIG_NETPOLL_TRAP
  1785. if (netpoll_trap())
  1786. return;
  1787. #endif
  1788. if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state))
  1789. __netif_schedule(txq->qdisc);
  1790. }
  1791. /*
  1792. * Returns a Tx hash for the given packet when dev->real_num_tx_queues is used
  1793. * as a distribution range limit for the returned value.
  1794. */
  1795. static inline u16 skb_tx_hash(const struct net_device *dev,
  1796. const struct sk_buff *skb)
  1797. {
  1798. return __skb_tx_hash(dev, skb, dev->real_num_tx_queues);
  1799. }
  1800. /**
  1801. * netif_is_multiqueue - test if device has multiple transmit queues
  1802. * @dev: network device
  1803. *
  1804. * Check if device has multiple transmit queues
  1805. */
  1806. static inline bool netif_is_multiqueue(const struct net_device *dev)
  1807. {
  1808. return dev->num_tx_queues > 1;
  1809. }
  1810. extern int netif_set_real_num_tx_queues(struct net_device *dev,
  1811. unsigned int txq);
  1812. #ifdef CONFIG_RPS
  1813. extern int netif_set_real_num_rx_queues(struct net_device *dev,
  1814. unsigned int rxq);
  1815. #else
  1816. static inline int netif_set_real_num_rx_queues(struct net_device *dev,
  1817. unsigned int rxq)
  1818. {
  1819. return 0;
  1820. }
  1821. #endif
  1822. static inline int netif_copy_real_num_queues(struct net_device *to_dev,
  1823. const struct net_device *from_dev)
  1824. {
  1825. netif_set_real_num_tx_queues(to_dev, from_dev->real_num_tx_queues);
  1826. #ifdef CONFIG_RPS
  1827. return netif_set_real_num_rx_queues(to_dev,
  1828. from_dev->real_num_rx_queues);
  1829. #else
  1830. return 0;
  1831. #endif
  1832. }
  1833. /* Use this variant when it is known for sure that it
  1834. * is executing from hardware interrupt context or with hardware interrupts
  1835. * disabled.
  1836. */
  1837. extern void dev_kfree_skb_irq(struct sk_buff *skb);
  1838. /* Use this variant in places where it could be invoked
  1839. * from either hardware interrupt or other context, with hardware interrupts
  1840. * either disabled or enabled.
  1841. */
  1842. extern void dev_kfree_skb_any(struct sk_buff *skb);
  1843. extern int netif_rx(struct sk_buff *skb);
  1844. extern int netif_rx_ni(struct sk_buff *skb);
  1845. extern int netif_receive_skb(struct sk_buff *skb);
  1846. extern gro_result_t dev_gro_receive(struct napi_struct *napi,
  1847. struct sk_buff *skb);
  1848. extern gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb);
  1849. extern gro_result_t napi_gro_receive(struct napi_struct *napi,
  1850. struct sk_buff *skb);
  1851. extern void napi_gro_flush(struct napi_struct *napi);
  1852. extern struct sk_buff * napi_get_frags(struct napi_struct *napi);
  1853. extern gro_result_t napi_frags_finish(struct napi_struct *napi,
  1854. struct sk_buff *skb,
  1855. gro_result_t ret);
  1856. extern struct sk_buff * napi_frags_skb(struct napi_struct *napi);
  1857. extern gro_result_t napi_gro_frags(struct napi_struct *napi);
  1858. static inline void napi_free_frags(struct napi_struct *napi)
  1859. {
  1860. kfree_skb(napi->skb);
  1861. napi->skb = NULL;
  1862. }
  1863. extern int netdev_rx_handler_register(struct net_device *dev,
  1864. rx_handler_func_t *rx_handler,
  1865. void *rx_handler_data);
  1866. extern void netdev_rx_handler_unregister(struct net_device *dev);
  1867. extern bool dev_valid_name(const char *name);
  1868. extern int dev_ioctl(struct net *net, unsigned int cmd, void __user *);
  1869. extern int dev_ethtool(struct net *net, struct ifreq *);
  1870. extern unsigned dev_get_flags(const struct net_device *);
  1871. extern int __dev_change_flags(struct net_device *, unsigned int flags);
  1872. extern int dev_change_flags(struct net_device *, unsigned);
  1873. extern void __dev_notify_flags(struct net_device *, unsigned int old_flags);
  1874. extern int dev_change_name(struct net_device *, const char *);
  1875. extern int dev_set_alias(struct net_device *, const char *, size_t);
  1876. extern int dev_change_net_namespace(struct net_device *,
  1877. struct net *, const char *);
  1878. extern int dev_set_mtu(struct net_device *, int);
  1879. extern void dev_set_group(struct net_device *, int);
  1880. extern int dev_set_mac_address(struct net_device *,
  1881. struct sockaddr *);
  1882. extern int dev_hard_start_xmit(struct sk_buff *skb,
  1883. struct net_device *dev,
  1884. struct netdev_queue *txq);
  1885. extern int dev_forward_skb(struct net_device *dev,
  1886. struct sk_buff *skb);
  1887. extern int netdev_budget;
  1888. /* Called by rtnetlink.c:rtnl_unlock() */
  1889. extern void netdev_run_todo(void);
  1890. /**
  1891. * dev_put - release reference to device
  1892. * @dev: network device
  1893. *
  1894. * Release reference to device to allow it to be freed.
  1895. */
  1896. static inline void dev_put(struct net_device *dev)
  1897. {
  1898. this_cpu_dec(*dev->pcpu_refcnt);
  1899. }
  1900. /**
  1901. * dev_hold - get reference to device
  1902. * @dev: network device
  1903. *
  1904. * Hold reference to device to keep it from being freed.
  1905. */
  1906. static inline void dev_hold(struct net_device *dev)
  1907. {
  1908. this_cpu_inc(*dev->pcpu_refcnt);
  1909. }
  1910. /* Carrier loss detection, dial on demand. The functions netif_carrier_on
  1911. * and _off may be called from IRQ context, but it is caller
  1912. * who is responsible for serialization of these calls.
  1913. *
  1914. * The name carrier is inappropriate, these functions should really be
  1915. * called netif_lowerlayer_*() because they represent the state of any
  1916. * kind of lower layer not just hardware media.
  1917. */
  1918. extern void linkwatch_fire_event(struct net_device *dev);
  1919. extern void linkwatch_forget_dev(struct net_device *dev);
  1920. /**
  1921. * netif_carrier_ok - test if carrier present
  1922. * @dev: network device
  1923. *
  1924. * Check if carrier is present on device
  1925. */
  1926. static inline bool netif_carrier_ok(const struct net_device *dev)
  1927. {
  1928. return !test_bit(__LINK_STATE_NOCARRIER, &dev->state);
  1929. }
  1930. extern unsigned long dev_trans_start(struct net_device *dev);
  1931. extern void __netdev_watchdog_up(struct net_device *dev);
  1932. extern void netif_carrier_on(struct net_device *dev);
  1933. extern void netif_carrier_off(struct net_device *dev);
  1934. extern void netif_notify_peers(struct net_device *dev);
  1935. /**
  1936. * netif_dormant_on - mark device as dormant.
  1937. * @dev: network device
  1938. *
  1939. * Mark device as dormant (as per RFC2863).
  1940. *
  1941. * The dormant state indicates that the relevant interface is not
  1942. * actually in a condition to pass packets (i.e., it is not 'up') but is
  1943. * in a "pending" state, waiting for some external event. For "on-
  1944. * demand" interfaces, this new state identifies the situation where the
  1945. * interface is waiting for events to place it in the up state.
  1946. *
  1947. */
  1948. static inline void netif_dormant_on(struct net_device *dev)
  1949. {
  1950. if (!test_and_set_bit(__LINK_STATE_DORMANT, &dev->state))
  1951. linkwatch_fire_event(dev);
  1952. }
  1953. /**
  1954. * netif_dormant_off - set device as not dormant.
  1955. * @dev: network device
  1956. *
  1957. * Device is not in dormant state.
  1958. */
  1959. static inline void netif_dormant_off(struct net_device *dev)
  1960. {
  1961. if (test_and_clear_bit(__LINK_STATE_DORMANT, &dev->state))
  1962. linkwatch_fire_event(dev);
  1963. }
  1964. /**
  1965. * netif_dormant - test if carrier present
  1966. * @dev: network device
  1967. *
  1968. * Check if carrier is present on device
  1969. */
  1970. static inline bool netif_dormant(const struct net_device *dev)
  1971. {
  1972. return test_bit(__LINK_STATE_DORMANT, &dev->state);
  1973. }
  1974. /**
  1975. * netif_oper_up - test if device is operational
  1976. * @dev: network device
  1977. *
  1978. * Check if carrier is operational
  1979. */
  1980. static inline bool netif_oper_up(const struct net_device *dev)
  1981. {
  1982. return (dev->operstate == IF_OPER_UP ||
  1983. dev->operstate == IF_OPER_UNKNOWN /* backward compat */);
  1984. }
  1985. /**
  1986. * netif_device_present - is device available or removed
  1987. * @dev: network device
  1988. *
  1989. * Check if device has not been removed from system.
  1990. */
  1991. static inline bool netif_device_present(struct net_device *dev)
  1992. {
  1993. return test_bit(__LINK_STATE_PRESENT, &dev->state);
  1994. }
  1995. extern void netif_device_detach(struct net_device *dev);
  1996. extern void netif_device_attach(struct net_device *dev);
  1997. /*
  1998. * Network interface message level settings
  1999. */
  2000. enum {
  2001. NETIF_MSG_DRV = 0x0001,
  2002. NETIF_MSG_PROBE = 0x0002,
  2003. NETIF_MSG_LINK = 0x0004,
  2004. NETIF_MSG_TIMER = 0x0008,
  2005. NETIF_MSG_IFDOWN = 0x0010,
  2006. NETIF_MSG_IFUP = 0x0020,
  2007. NETIF_MSG_RX_ERR = 0x0040,
  2008. NETIF_MSG_TX_ERR = 0x0080,
  2009. NETIF_MSG_TX_QUEUED = 0x0100,
  2010. NETIF_MSG_INTR = 0x0200,
  2011. NETIF_MSG_TX_DONE = 0x0400,
  2012. NETIF_MSG_RX_STATUS = 0x0800,
  2013. NETIF_MSG_PKTDATA = 0x1000,
  2014. NETIF_MSG_HW = 0x2000,
  2015. NETIF_MSG_WOL = 0x4000,
  2016. };
  2017. #define netif_msg_drv(p) ((p)->msg_enable & NETIF_MSG_DRV)
  2018. #define netif_msg_probe(p) ((p)->msg_enable & NETIF_MSG_PROBE)
  2019. #define netif_msg_link(p) ((p)->msg_enable & NETIF_MSG_LINK)
  2020. #define netif_msg_timer(p) ((p)->msg_enable & NETIF_MSG_TIMER)
  2021. #define netif_msg_ifdown(p) ((p)->msg_enable & NETIF_MSG_IFDOWN)
  2022. #define netif_msg_ifup(p) ((p)->msg_enable & NETIF_MSG_IFUP)
  2023. #define netif_msg_rx_err(p) ((p)->msg_enable & NETIF_MSG_RX_ERR)
  2024. #define netif_msg_tx_err(p) ((p)->msg_enable & NETIF_MSG_TX_ERR)
  2025. #define netif_msg_tx_queued(p) ((p)->msg_enable & NETIF_MSG_TX_QUEUED)
  2026. #define netif_msg_intr(p) ((p)->msg_enable & NETIF_MSG_INTR)
  2027. #define netif_msg_tx_done(p) ((p)->msg_enable & NETIF_MSG_TX_DONE)
  2028. #define netif_msg_rx_status(p) ((p)->msg_enable & NETIF_MSG_RX_STATUS)
  2029. #define netif_msg_pktdata(p) ((p)->msg_enable & NETIF_MSG_PKTDATA)
  2030. #define netif_msg_hw(p) ((p)->msg_enable & NETIF_MSG_HW)
  2031. #define netif_msg_wol(p) ((p)->msg_enable & NETIF_MSG_WOL)
  2032. static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits)
  2033. {
  2034. /* use default */
  2035. if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
  2036. return default_msg_enable_bits;
  2037. if (debug_value == 0) /* no output */
  2038. return 0;
  2039. /* set low N bits */
  2040. return (1 << debug_value) - 1;
  2041. }
  2042. static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
  2043. {
  2044. spin_lock(&txq->_xmit_lock);
  2045. txq->xmit_lock_owner = cpu;
  2046. }
  2047. static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
  2048. {
  2049. spin_lock_bh(&txq->_xmit_lock);
  2050. txq->xmit_lock_owner = smp_processor_id();
  2051. }
  2052. static inline bool __netif_tx_trylock(struct netdev_queue *txq)
  2053. {
  2054. bool ok = spin_trylock(&txq->_xmit_lock);
  2055. if (likely(ok))
  2056. txq->xmit_lock_owner = smp_processor_id();
  2057. return ok;
  2058. }
  2059. static inline void __netif_tx_unlock(struct netdev_queue *txq)
  2060. {
  2061. txq->xmit_lock_owner = -1;
  2062. spin_unlock(&txq->_xmit_lock);
  2063. }
  2064. static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
  2065. {
  2066. txq->xmit_lock_owner = -1;
  2067. spin_unlock_bh(&txq->_xmit_lock);
  2068. }
  2069. static inline void txq_trans_update(struct netdev_queue *txq)
  2070. {
  2071. if (txq->xmit_lock_owner != -1)
  2072. txq->trans_start = jiffies;
  2073. }
  2074. /**
  2075. * netif_tx_lock - grab network device transmit lock
  2076. * @dev: network device
  2077. *
  2078. * Get network device transmit lock
  2079. */
  2080. static inline void netif_tx_lock(struct net_device *dev)
  2081. {
  2082. unsigned int i;
  2083. int cpu;
  2084. spin_lock(&dev->tx_global_lock);
  2085. cpu = smp_processor_id();
  2086. for (i = 0; i < dev->num_tx_queues; i++) {
  2087. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  2088. /* We are the only thread of execution doing a
  2089. * freeze, but we have to grab the _xmit_lock in
  2090. * order to synchronize with threads which are in
  2091. * the ->hard_start_xmit() handler and already
  2092. * checked the frozen bit.
  2093. */
  2094. __netif_tx_lock(txq, cpu);
  2095. set_bit(__QUEUE_STATE_FROZEN, &txq->state);
  2096. __netif_tx_unlock(txq);
  2097. }
  2098. }
  2099. static inline void netif_tx_lock_bh(struct net_device *dev)
  2100. {
  2101. local_bh_disable();
  2102. netif_tx_lock(dev);
  2103. }
  2104. static inline void netif_tx_unlock(struct net_device *dev)
  2105. {
  2106. unsigned int i;
  2107. for (i = 0; i < dev->num_tx_queues; i++) {
  2108. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  2109. /* No need to grab the _xmit_lock here. If the
  2110. * queue is not stopped for another reason, we
  2111. * force a schedule.
  2112. */
  2113. clear_bit(__QUEUE_STATE_FROZEN, &txq->state);
  2114. netif_schedule_queue(txq);
  2115. }
  2116. spin_unlock(&dev->tx_global_lock);
  2117. }
  2118. static inline void netif_tx_unlock_bh(struct net_device *dev)
  2119. {
  2120. netif_tx_unlock(dev);
  2121. local_bh_enable();
  2122. }
  2123. #define HARD_TX_LOCK(dev, txq, cpu) { \
  2124. if ((dev->features & NETIF_F_LLTX) == 0) { \
  2125. __netif_tx_lock(txq, cpu); \
  2126. } \
  2127. }
  2128. #define HARD_TX_UNLOCK(dev, txq) { \
  2129. if ((dev->features & NETIF_F_LLTX) == 0) { \
  2130. __netif_tx_unlock(txq); \
  2131. } \
  2132. }
  2133. static inline void netif_tx_disable(struct net_device *dev)
  2134. {
  2135. unsigned int i;
  2136. int cpu;
  2137. local_bh_disable();
  2138. cpu = smp_processor_id();
  2139. for (i = 0; i < dev->num_tx_queues; i++) {
  2140. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  2141. __netif_tx_lock(txq, cpu);
  2142. netif_tx_stop_queue(txq);
  2143. __netif_tx_unlock(txq);
  2144. }
  2145. local_bh_enable();
  2146. }
  2147. static inline void netif_addr_lock(struct net_device *dev)
  2148. {
  2149. spin_lock(&dev->addr_list_lock);
  2150. }
  2151. static inline void netif_addr_lock_nested(struct net_device *dev)
  2152. {
  2153. spin_lock_nested(&dev->addr_list_lock, SINGLE_DEPTH_NESTING);
  2154. }
  2155. static inline void netif_addr_lock_bh(struct net_device *dev)
  2156. {
  2157. spin_lock_bh(&dev->addr_list_lock);
  2158. }
  2159. static inline void netif_addr_unlock(struct net_device *dev)
  2160. {
  2161. spin_unlock(&dev->addr_list_lock);
  2162. }
  2163. static inline void netif_addr_unlock_bh(struct net_device *dev)
  2164. {
  2165. spin_unlock_bh(&dev->addr_list_lock);
  2166. }
  2167. /*
  2168. * dev_addrs walker. Should be used only for read access. Call with
  2169. * rcu_read_lock held.
  2170. */
  2171. #define for_each_dev_addr(dev, ha) \
  2172. list_for_each_entry_rcu(ha, &dev->dev_addrs.list, list)
  2173. /* These functions live elsewhere (drivers/net/net_init.c, but related) */
  2174. extern void ether_setup(struct net_device *dev);
  2175. /* Support for loadable net-drivers */
  2176. extern struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
  2177. void (*setup)(struct net_device *),
  2178. unsigned int txqs, unsigned int rxqs);
  2179. #define alloc_netdev(sizeof_priv, name, setup) \
  2180. alloc_netdev_mqs(sizeof_priv, name, setup, 1, 1)
  2181. #define alloc_netdev_mq(sizeof_priv, name, setup, count) \
  2182. alloc_netdev_mqs(sizeof_priv, name, setup, count, count)
  2183. extern int register_netdev(struct net_device *dev);
  2184. extern void unregister_netdev(struct net_device *dev);
  2185. /* General hardware address lists handling functions */
  2186. extern int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
  2187. struct netdev_hw_addr_list *from_list,
  2188. int addr_len, unsigned char addr_type);
  2189. extern void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
  2190. struct netdev_hw_addr_list *from_list,
  2191. int addr_len, unsigned char addr_type);
  2192. extern int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
  2193. struct netdev_hw_addr_list *from_list,
  2194. int addr_len);
  2195. extern void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
  2196. struct netdev_hw_addr_list *from_list,
  2197. int addr_len);
  2198. extern void __hw_addr_flush(struct netdev_hw_addr_list *list);
  2199. extern void __hw_addr_init(struct netdev_hw_addr_list *list);
  2200. /* Functions used for device addresses handling */
  2201. extern int dev_addr_add(struct net_device *dev, unsigned char *addr,
  2202. unsigned char addr_type);
  2203. extern int dev_addr_del(struct net_device *dev, unsigned char *addr,
  2204. unsigned char addr_type);
  2205. extern int dev_addr_add_multiple(struct net_device *to_dev,
  2206. struct net_device *from_dev,
  2207. unsigned char addr_type);
  2208. extern int dev_addr_del_multiple(struct net_device *to_dev,
  2209. struct net_device *from_dev,
  2210. unsigned char addr_type);
  2211. extern void dev_addr_flush(struct net_device *dev);
  2212. extern int dev_addr_init(struct net_device *dev);
  2213. /* Functions used for unicast addresses handling */
  2214. extern int dev_uc_add(struct net_device *dev, unsigned char *addr);
  2215. extern int dev_uc_del(struct net_device *dev, unsigned char *addr);
  2216. extern int dev_uc_sync(struct net_device *to, struct net_device *from);
  2217. extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
  2218. extern void dev_uc_flush(struct net_device *dev);
  2219. extern void dev_uc_init(struct net_device *dev);
  2220. /* Functions used for multicast addresses handling */
  2221. extern int dev_mc_add(struct net_device *dev, unsigned char *addr);
  2222. extern int dev_mc_add_global(struct net_device *dev, unsigned char *addr);
  2223. extern int dev_mc_del(struct net_device *dev, unsigned char *addr);
  2224. extern int dev_mc_del_global(struct net_device *dev, unsigned char *addr);
  2225. extern int dev_mc_sync(struct net_device *to, struct net_device *from);
  2226. extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
  2227. extern void dev_mc_flush(struct net_device *dev);
  2228. extern void dev_mc_init(struct net_device *dev);
  2229. /* Functions used for secondary unicast and multicast support */
  2230. extern void dev_set_rx_mode(struct net_device *dev);
  2231. extern void __dev_set_rx_mode(struct net_device *dev);
  2232. extern int dev_set_promiscuity(struct net_device *dev, int inc);
  2233. extern int dev_set_allmulti(struct net_device *dev, int inc);
  2234. extern void netdev_state_change(struct net_device *dev);
  2235. extern int netdev_bonding_change(struct net_device *dev,
  2236. unsigned long event);
  2237. extern void netdev_features_change(struct net_device *dev);
  2238. /* Load a device via the kmod */
  2239. extern void dev_load(struct net *net, const char *name);
  2240. extern void dev_mcast_init(void);
  2241. extern struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
  2242. struct rtnl_link_stats64 *storage);
  2243. extern void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
  2244. const struct net_device_stats *netdev_stats);
  2245. extern int netdev_max_backlog;
  2246. extern int netdev_tstamp_prequeue;
  2247. extern int weight_p;
  2248. extern int bpf_jit_enable;
  2249. extern int netdev_set_master(struct net_device *dev, struct net_device *master);
  2250. extern int netdev_set_bond_master(struct net_device *dev,
  2251. struct net_device *master);
  2252. extern int skb_checksum_help(struct sk_buff *skb);
  2253. extern struct sk_buff *skb_gso_segment(struct sk_buff *skb,
  2254. netdev_features_t features);
  2255. #ifdef CONFIG_BUG
  2256. extern void netdev_rx_csum_fault(struct net_device *dev);
  2257. #else
  2258. static inline void netdev_rx_csum_fault(struct net_device *dev)
  2259. {
  2260. }
  2261. #endif
  2262. /* rx skb timestamps */
  2263. extern void net_enable_timestamp(void);
  2264. extern void net_disable_timestamp(void);
  2265. #ifdef CONFIG_PROC_FS
  2266. extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
  2267. extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
  2268. extern void dev_seq_stop(struct seq_file *seq, void *v);
  2269. #endif
  2270. extern int netdev_class_create_file(struct class_attribute *class_attr);
  2271. extern void netdev_class_remove_file(struct class_attribute *class_attr);
  2272. extern struct kobj_ns_type_operations net_ns_type_operations;
  2273. extern const char *netdev_drivername(const struct net_device *dev);
  2274. extern void linkwatch_run_queue(void);
  2275. static inline netdev_features_t netdev_get_wanted_features(
  2276. struct net_device *dev)
  2277. {
  2278. return (dev->features & ~dev->hw_features) | dev->wanted_features;
  2279. }
  2280. netdev_features_t netdev_increment_features(netdev_features_t all,
  2281. netdev_features_t one, netdev_features_t mask);
  2282. int __netdev_update_features(struct net_device *dev);
  2283. void netdev_update_features(struct net_device *dev);
  2284. void netdev_change_features(struct net_device *dev);
  2285. void netif_stacked_transfer_operstate(const struct net_device *rootdev,
  2286. struct net_device *dev);
  2287. netdev_features_t netif_skb_features(struct sk_buff *skb);
  2288. static inline bool net_gso_ok(netdev_features_t features, int gso_type)
  2289. {
  2290. netdev_features_t feature = gso_type << NETIF_F_GSO_SHIFT;
  2291. /* check flags correspondence */
  2292. BUILD_BUG_ON(SKB_GSO_TCPV4 != (NETIF_F_TSO >> NETIF_F_GSO_SHIFT));
  2293. BUILD_BUG_ON(SKB_GSO_UDP != (NETIF_F_UFO >> NETIF_F_GSO_SHIFT));
  2294. BUILD_BUG_ON(SKB_GSO_DODGY != (NETIF_F_GSO_ROBUST >> NETIF_F_GSO_SHIFT));
  2295. BUILD_BUG_ON(SKB_GSO_TCP_ECN != (NETIF_F_TSO_ECN >> NETIF_F_GSO_SHIFT));
  2296. BUILD_BUG_ON(SKB_GSO_TCPV6 != (NETIF_F_TSO6 >> NETIF_F_GSO_SHIFT));
  2297. BUILD_BUG_ON(SKB_GSO_FCOE != (NETIF_F_FSO >> NETIF_F_GSO_SHIFT));
  2298. return (features & feature) == feature;
  2299. }
  2300. static inline bool skb_gso_ok(struct sk_buff *skb, netdev_features_t features)
  2301. {
  2302. return net_gso_ok(features, skb_shinfo(skb)->gso_type) &&
  2303. (!skb_has_frag_list(skb) || (features & NETIF_F_FRAGLIST));
  2304. }
  2305. static inline bool netif_needs_gso(struct sk_buff *skb,
  2306. netdev_features_t features)
  2307. {
  2308. return skb_is_gso(skb) && (!skb_gso_ok(skb, features) ||
  2309. unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
  2310. (skb->ip_summed != CHECKSUM_UNNECESSARY)));
  2311. }
  2312. static inline void netif_set_gso_max_size(struct net_device *dev,
  2313. unsigned int size)
  2314. {
  2315. dev->gso_max_size = size;
  2316. }
  2317. static inline bool netif_is_bond_slave(struct net_device *dev)
  2318. {
  2319. return dev->flags & IFF_SLAVE && dev->priv_flags & IFF_BONDING;
  2320. }
  2321. static inline bool netif_supports_nofcs(struct net_device *dev)
  2322. {
  2323. return dev->priv_flags & IFF_SUPP_NOFCS;
  2324. }
  2325. extern struct pernet_operations __net_initdata loopback_net_ops;
  2326. /* Logging, debugging and troubleshooting/diagnostic helpers. */
  2327. /* netdev_printk helpers, similar to dev_printk */
  2328. static inline const char *netdev_name(const struct net_device *dev)
  2329. {
  2330. if (dev->reg_state != NETREG_REGISTERED)
  2331. return "(unregistered net_device)";
  2332. return dev->name;
  2333. }
  2334. extern int __netdev_printk(const char *level, const struct net_device *dev,
  2335. struct va_format *vaf);
  2336. extern __printf(3, 4)
  2337. int netdev_printk(const char *level, const struct net_device *dev,
  2338. const char *format, ...);
  2339. extern __printf(2, 3)
  2340. int netdev_emerg(const struct net_device *dev, const char *format, ...);
  2341. extern __printf(2, 3)
  2342. int netdev_alert(const struct net_device *dev, const char *format, ...);
  2343. extern __printf(2, 3)
  2344. int netdev_crit(const struct net_device *dev, const char *format, ...);
  2345. extern __printf(2, 3)
  2346. int netdev_err(const struct net_device *dev, const char *format, ...);
  2347. extern __printf(2, 3)
  2348. int netdev_warn(const struct net_device *dev, const char *format, ...);
  2349. extern __printf(2, 3)
  2350. int netdev_notice(const struct net_device *dev, const char *format, ...);
  2351. extern __printf(2, 3)
  2352. int netdev_info(const struct net_device *dev, const char *format, ...);
  2353. #define MODULE_ALIAS_NETDEV(device) \
  2354. MODULE_ALIAS("netdev-" device)
  2355. #if defined(CONFIG_DYNAMIC_DEBUG)
  2356. #define netdev_dbg(__dev, format, args...) \
  2357. do { \
  2358. dynamic_netdev_dbg(__dev, format, ##args); \
  2359. } while (0)
  2360. #elif defined(DEBUG)
  2361. #define netdev_dbg(__dev, format, args...) \
  2362. netdev_printk(KERN_DEBUG, __dev, format, ##args)
  2363. #else
  2364. #define netdev_dbg(__dev, format, args...) \
  2365. ({ \
  2366. if (0) \
  2367. netdev_printk(KERN_DEBUG, __dev, format, ##args); \
  2368. 0; \
  2369. })
  2370. #endif
  2371. #if defined(VERBOSE_DEBUG)
  2372. #define netdev_vdbg netdev_dbg
  2373. #else
  2374. #define netdev_vdbg(dev, format, args...) \
  2375. ({ \
  2376. if (0) \
  2377. netdev_printk(KERN_DEBUG, dev, format, ##args); \
  2378. 0; \
  2379. })
  2380. #endif
  2381. /*
  2382. * netdev_WARN() acts like dev_printk(), but with the key difference
  2383. * of using a WARN/WARN_ON to get the message out, including the
  2384. * file/line information and a backtrace.
  2385. */
  2386. #define netdev_WARN(dev, format, args...) \
  2387. WARN(1, "netdevice: %s\n" format, netdev_name(dev), ##args);
  2388. /* netif printk helpers, similar to netdev_printk */
  2389. #define netif_printk(priv, type, level, dev, fmt, args...) \
  2390. do { \
  2391. if (netif_msg_##type(priv)) \
  2392. netdev_printk(level, (dev), fmt, ##args); \
  2393. } while (0)
  2394. #define netif_level(level, priv, type, dev, fmt, args...) \
  2395. do { \
  2396. if (netif_msg_##type(priv)) \
  2397. netdev_##level(dev, fmt, ##args); \
  2398. } while (0)
  2399. #define netif_emerg(priv, type, dev, fmt, args...) \
  2400. netif_level(emerg, priv, type, dev, fmt, ##args)
  2401. #define netif_alert(priv, type, dev, fmt, args...) \
  2402. netif_level(alert, priv, type, dev, fmt, ##args)
  2403. #define netif_crit(priv, type, dev, fmt, args...) \
  2404. netif_level(crit, priv, type, dev, fmt, ##args)
  2405. #define netif_err(priv, type, dev, fmt, args...) \
  2406. netif_level(err, priv, type, dev, fmt, ##args)
  2407. #define netif_warn(priv, type, dev, fmt, args...) \
  2408. netif_level(warn, priv, type, dev, fmt, ##args)
  2409. #define netif_notice(priv, type, dev, fmt, args...) \
  2410. netif_level(notice, priv, type, dev, fmt, ##args)
  2411. #define netif_info(priv, type, dev, fmt, args...) \
  2412. netif_level(info, priv, type, dev, fmt, ##args)
  2413. #if defined(DEBUG)
  2414. #define netif_dbg(priv, type, dev, format, args...) \
  2415. netif_printk(priv, type, KERN_DEBUG, dev, format, ##args)
  2416. #elif defined(CONFIG_DYNAMIC_DEBUG)
  2417. #define netif_dbg(priv, type, netdev, format, args...) \
  2418. do { \
  2419. if (netif_msg_##type(priv)) \
  2420. dynamic_netdev_dbg(netdev, format, ##args); \
  2421. } while (0)
  2422. #else
  2423. #define netif_dbg(priv, type, dev, format, args...) \
  2424. ({ \
  2425. if (0) \
  2426. netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
  2427. 0; \
  2428. })
  2429. #endif
  2430. #if defined(VERBOSE_DEBUG)
  2431. #define netif_vdbg netif_dbg
  2432. #else
  2433. #define netif_vdbg(priv, type, dev, format, args...) \
  2434. ({ \
  2435. if (0) \
  2436. netif_printk(priv, type, KERN_DEBUG, dev, format, ##args); \
  2437. 0; \
  2438. })
  2439. #endif
  2440. #endif /* __KERNEL__ */
  2441. #endif /* _LINUX_NETDEVICE_H */