cregit-Linux how code gets into the kernel

Release 4.7 include/linux/etherdevice.h

Directory: include/linux
/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  NET  is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the Ethernet handlers.
 *
 * Version:     @(#)eth.h       1.0.4   05/13/93
 *
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              Relocated to include/linux where it belongs by Alan Cox 
 *                                                      <gw4pts@gw4pts.ampr.org>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 */
#ifndef _LINUX_ETHERDEVICE_H

#define _LINUX_ETHERDEVICE_H

#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/random.h>
#include <asm/unaligned.h>
#include <asm/bitsperlong.h>

#ifdef __KERNEL__
struct device;
int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
unsigned char *arch_get_platform_get_mac_address(void);
u32 eth_get_headlen(void *data, unsigned int max_len);
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
extern const struct header_ops eth_header_ops;

int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
	       const void *daddr, const void *saddr, unsigned len);
int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
		     __be16 type);
void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev,
			     const unsigned char *haddr);
int eth_prepare_mac_addr_change(struct net_device *dev, void *p);
void eth_commit_mac_addr_change(struct net_device *dev, void *p);
int eth_mac_addr(struct net_device *dev, void *p);
int eth_change_mtu(struct net_device *dev, int new_mtu);
int eth_validate_addr(struct net_device *dev);

struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
					    unsigned int rxqs);

#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)

#define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)

struct sk_buff **eth_gro_receive(struct sk_buff **head,
				 struct sk_buff *skb);
int eth_gro_complete(struct sk_buff *skb, int nhoff);

/* Reserved Ethernet Addresses per IEEE 802.1Q */
static const u8 eth_reserved_addr_base[ETH_ALEN] __aligned(2) =
{ 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };

/**
 * is_link_local_ether_addr - Determine if given Ethernet address is link-local
 * @addr: Pointer to a six-byte array containing the Ethernet address
 *
 * Return true if address is link local reserved addr (01:80:c2:00:00:0X) per
 * IEEE 802.1Q 8.6.3 Frame filtering.
 *
 * Please note: addr must be aligned to u16.
 */

static inline bool is_link_local_ether_addr(const u8 *addr) { __be16 *a = (__be16 *)addr; static const __be16 *b = (const __be16 *)eth_reserved_addr_base; static const __be16 m = cpu_to_be16(0xfff0); #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) return (((*(const u32 *)addr) ^ (*(const u32 *)b)) | (__force int)((a[2] ^ b[2]) & m)) == 0; #else return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | ((a[2] ^ b[2]) & m)) == 0; #endif }

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john fastabendjohn fastabend8457.14%120.00%
joe perchesjoe perches5134.69%120.00%
ben hutchingsben hutchings64.08%240.00%
jesse brandeburgjesse brandeburg64.08%120.00%
Total147100.00%5100.00%

/** * is_zero_ether_addr - Determine if give Ethernet address is all zeros. * @addr: Pointer to a six-byte array containing the Ethernet address * * Return true if the address is all zeroes. * * Please note: addr must be aligned to u16. */
static inline bool is_zero_ether_addr(const u8 *addr) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) return ((*(const u32 *)addr) | (*(const u16 *)(addr + 4))) == 0; #else return (*(const u16 *)(addr + 0) | *(const u16 *)(addr + 2) | *(const u16 *)(addr + 4)) == 0; #endif }

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stephen hemmingerstephen hemminger1617.39%233.33%
linus torvaldslinus torvalds88.70%233.33%
Total92100.00%6100.00%

/** * is_multicast_ether_addr - Determine if the Ethernet address is a multicast. * @addr: Pointer to a six-byte array containing the Ethernet address * * Return true if the address is a multicast address. * By definition the broadcast address is also a multicast address. */
static inline bool is_multicast_ether_addr(const u8 *addr) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) u32 a = *(const u32 *)addr; #else u16 a = *(const u16 *)addr; #endif #ifdef __BIG_ENDIAN return 0x01 & (a >> ((sizeof(a) * 8) - 8)); #else return 0x01 & a; #endif }

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alexander duyckalexander duyck6281.58%114.29%
stephen hemmingerstephen hemminger810.53%114.29%
michael ellermanmichael ellerman22.63%114.29%
linus torvaldslinus torvalds22.63%228.57%
joe perchesjoe perches11.32%114.29%
jeff garzikjeff garzik11.32%114.29%
Total76100.00%7100.00%


static inline bool is_multicast_ether_addr_64bits(const u8 addr[6+2]) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 #ifdef __BIG_ENDIAN return 0x01 & ((*(const u64 *)addr) >> 56); #else return 0x01 & (*(const u64 *)addr); #endif #else return is_multicast_ether_addr(addr); #endif }

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alexander duyckalexander duyck6893.15%133.33%
jeff garzikjeff garzik34.11%133.33%
michael ellermanmichael ellerman22.74%133.33%
Total73100.00%3100.00%

/** * is_local_ether_addr - Determine if the Ethernet address is locally-assigned one (IEEE 802). * @addr: Pointer to a six-byte array containing the Ethernet address * * Return true if the address is a local address. */
static inline bool is_local_ether_addr(const u8 *addr) { return 0x02 & addr[0]; }

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paolo giarrussopaolo giarrusso1995.00%150.00%
joe perchesjoe perches15.00%150.00%
Total20100.00%2100.00%

/** * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast * @addr: Pointer to a six-byte array containing the Ethernet address * * Return true if the address is the broadcast address. * * Please note: addr must be aligned to u16. */
static inline bool is_broadcast_ether_addr(const u8 *addr) { return (*(const u16 *)(addr + 0) & *(const u16 *)(addr + 2) & *(const u16 *)(addr + 4)) == 0xffff; }

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stephen hemmingerstephen hemminger35.66%125.00%
Total53100.00%4100.00%

/** * is_unicast_ether_addr - Determine if the Ethernet address is unicast * @addr: Pointer to a six-byte array containing the Ethernet address * * Return true if the address is a unicast address. */
static inline bool is_unicast_ether_addr(const u8 *addr) { return !is_multicast_ether_addr(addr); }

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tobias klausertobias klauser1894.74%150.00%
joe perchesjoe perches15.26%150.00%
Total19100.00%2100.00%

/** * is_valid_ether_addr - Determine if the given Ethernet address is valid * @addr: Pointer to a six-byte array containing the Ethernet address * * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not * a multicast address, and is not FF:FF:FF:FF:FF:FF. * * Return true if the address is valid. * * Please note: addr must be aligned to u16. */
static inline bool is_valid_ether_addr(const u8 *addr) { /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to * explicitly check for it here. */ return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); }

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michael ellermanmichael ellerman1765.38%125.00%
linus torvaldslinus torvalds623.08%125.00%
stephen hemmingerstephen hemminger27.69%125.00%
joe perchesjoe perches13.85%125.00%
Total26100.00%4100.00%

/** * eth_proto_is_802_3 - Determine if a given Ethertype/length is a protocol * @proto: Ethertype/length value to be tested * * Check that the value from the Ethertype/length field is a valid Ethertype. * * Return true if the valid is an 802.3 supported Ethertype. */
static inline bool eth_proto_is_802_3(__be16 proto) { #ifndef __BIG_ENDIAN /* if CPU is little endian mask off bits representing LSB */ proto &= htons(0xFF00); #endif /* cast both to u16 and compare since LSB can be ignored */ return (__force u16)proto >= (__force u16)htons(ETH_P_802_3_MIN); }

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alexander duyckalexander duyck40100.00%1100.00%
Total40100.00%1100.00%

/** * eth_random_addr - Generate software assigned random Ethernet address * @addr: Pointer to a six-byte array containing the Ethernet address * * Generate a random Ethernet address (MAC) that is not multicast * and has the local assigned bit set. */
static inline void eth_random_addr(u8 *addr) { get_random_bytes(addr, ETH_ALEN); addr[0] &= 0xfe; /* clear multicast bit */ addr[0] |= 0x02; /* set local assignment bit (IEEE802) */ }

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joe perchesjoe perches12.94%150.00%
Total34100.00%2100.00%

#define random_ether_addr(addr) eth_random_addr(addr) /** * eth_broadcast_addr - Assign broadcast address * @addr: Pointer to a six-byte array containing the Ethernet address * * Assign the broadcast address to the given address array. */
static inline void eth_broadcast_addr(u8 *addr) { memset(addr, 0xff, ETH_ALEN); }

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johannes bergjohannes berg20100.00%1100.00%
Total20100.00%1100.00%

/** * eth_zero_addr - Assign zero address * @addr: Pointer to a six-byte array containing the Ethernet address * * Assign the zero address to the given address array. */
static inline void eth_zero_addr(u8 *addr) { memset(addr, 0x00, ETH_ALEN); }

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duan jiongduan jiong20100.00%1100.00%
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/** * eth_hw_addr_random - Generate software assigned random Ethernet and * set device flag * @dev: pointer to net_device structure * * Generate a random Ethernet address (MAC) to be used by a net device * and set addr_assign_type so the state can be read by sysfs and be * used by userspace. */
static inline void eth_hw_addr_random(struct net_device *dev) { dev->addr_assign_type = NET_ADDR_RANDOM; eth_random_addr(dev->dev_addr); }

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jiri pirkojiri pirko14.00%125.00%
joe perchesjoe perches14.00%125.00%
Total25100.00%4100.00%

/** * ether_addr_copy - Copy an Ethernet address * @dst: Pointer to a six-byte array Ethernet address destination * @src: Pointer to a six-byte array Ethernet address source * * Please note: dst & src must both be aligned to u16. */
static inline void ether_addr_copy(u8 *dst, const u8 *src) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) *(u32 *)dst = *(const u32 *)src; *(u16 *)(dst + 4) = *(const u16 *)(src + 4); #else u16 *a = (u16 *)dst; const u16 *b = (const u16 *)src; a[0] = b[0]; a[1] = b[1]; a[2] = b[2]; #endif }

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/** * eth_hw_addr_inherit - Copy dev_addr from another net_device * @dst: pointer to net_device to copy dev_addr to * @src: pointer to net_device to copy dev_addr from * * Copy the Ethernet address from one net_device to another along with * the address attributes (addr_assign_type). */
static inline void eth_hw_addr_inherit(struct net_device *dst, struct net_device *src) { dst->addr_assign_type = src->addr_assign_type; ether_addr_copy(dst->dev_addr, src->dev_addr); }

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Total36100.00%2100.00%

/** * ether_addr_equal - Compare two Ethernet addresses * @addr1: Pointer to a six-byte array containing the Ethernet address * @addr2: Pointer other six-byte array containing the Ethernet address * * Compare two Ethernet addresses, returns true if equal * * Please note: addr1 & addr2 must both be aligned to u16. */
static inline bool ether_addr_equal(const u8 *addr1, const u8 *addr2) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) u32 fold = ((*(const u32 *)addr1) ^ (*(const u32 *)addr2)) | ((*(const u16 *)(addr1 + 4)) ^ (*(const u16 *)(addr2 + 4))); return fold == 0; #else const u16 *a = (const u16 *)addr1; const u16 *b = (const u16 *)addr2; return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) == 0; #endif }

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joe perchesjoe perches7146.71%125.00%
eric dumazeteric dumazet31.97%125.00%
Total152100.00%4100.00%

/** * ether_addr_equal_64bits - Compare two Ethernet addresses * @addr1: Pointer to an array of 8 bytes * @addr2: Pointer to an other array of 8 bytes * * Compare two Ethernet addresses, returns true if equal, false otherwise. * * The function doesn't need any conditional branches and possibly uses * word memory accesses on CPU allowing cheap unaligned memory reads. * arrays = { byte1, byte2, byte3, byte4, byte5, byte6, pad1, pad2 } * * Please note that alignment of addr1 & addr2 are only guaranteed to be 16 bits. */
static inline bool ether_addr_equal_64bits(const u8 addr1[6+2], const u8 addr2[6+2]) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 u64 fold = (*(const u64 *)addr1) ^ (*(const u64 *)addr2); #ifdef __BIG_ENDIAN return (fold >> 16) == 0; #else return (fold << 16) == 0; #endif #else return ether_addr_equal(addr1, addr2); #endif }

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Total95100.00%3100.00%

/** * ether_addr_equal_unaligned - Compare two not u16 aligned Ethernet addresses * @addr1: Pointer to a six-byte array containing the Ethernet address * @addr2: Pointer other six-byte array containing the Ethernet address * * Compare two Ethernet addresses, returns true if equal * * Please note: Use only when any Ethernet address may not be u16 aligned. */
static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) return ether_addr_equal(addr1, addr2); #else return memcmp(addr1, addr2, ETH_ALEN) == 0; #endif }

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/** * is_etherdev_addr - Tell if given Ethernet address belongs to the device. * @dev: Pointer to a device structure * @addr: Pointer to a six-byte array containing the Ethernet address * * Compare passed address with all addresses of the device. Return true if the * address if one of the device addresses. * * Note that this function calls ether_addr_equal_64bits() so take care of * the right padding. */
static inline bool is_etherdev_addr(const struct net_device *dev, const u8 addr[6 + 2]) { struct netdev_hw_addr *ha; bool res = false; rcu_read_lock(); for_each_dev_addr(dev, ha) { res = ether_addr_equal_64bits(addr, ha->addr); if (res) break; } rcu_read_unlock(); return res; }

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#endif /* __KERNEL__ */ /** * compare_ether_header - Compare two Ethernet headers * @a: Pointer to Ethernet header * @b: Pointer to Ethernet header * * Compare two Ethernet headers, returns 0 if equal. * This assumes that the network header (i.e., IP header) is 4-byte * aligned OR the platform can handle unaligned access. This is the * case for all packets coming into netif_receive_skb or similar * entry points. */
static inline unsigned long compare_ether_header(const void *a, const void *b) { #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 unsigned long fold; /* * We want to compare 14 bytes: * [a0 ... a13] ^ [b0 ... b13] * Use two long XOR, ORed together, with an overlap of two bytes. * [a0 a1 a2 a3 a4 a5 a6 a7 ] ^ [b0 b1 b2 b3 b4 b5 b6 b7 ] | * [a6 a7 a8 a9 a10 a11 a12 a13] ^ [b6 b7 b8 b9 b10 b11 b12 b13] * This means the [a6 a7] ^ [b6 b7] part is done two times. */ fold = *(unsigned long *)a ^ *(unsigned long *)b; fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6); return fold; #else u32 *a32 = (u32 *)((u8 *)a + 2); u32 *b32 = (u32 *)((u8 *)b + 2); return (*(u16 *)a ^ *(u16 *)b) | (a32[0] ^ b32[0]) | (a32[1] ^ b32[1]) | (a32[2] ^ b32[2]); #endif }

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herbert xuherbert xu10560.69%150.00%
eric dumazeteric dumazet6839.31%150.00%
Total173100.00%2100.00%

/** * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame * @skb: Buffer to pad * * An Ethernet frame should have a minimum size of 60 bytes. This function * takes short frames and pads them with zeros up to the 60 byte limit. */
static inline int eth_skb_pad(struct sk_buff *skb) { return skb_put_padto(skb, ETH_ZLEN); }

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alexander duyckalexander duyck20100.00%1100.00%
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#endif /* _LINUX_ETHERDEVICE_H */

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joe perchesjoe perches44526.21%712.07%
stephen hemmingerstephen hemminger22413.19%1017.24%
alexander duyckalexander duyck20412.01%46.90%
eric dumazeteric dumazet1357.95%23.45%
john fastabendjohn fastabend1066.24%11.72%
herbert xuherbert xu1056.18%11.72%
pre-gitpre-git814.77%813.79%
jiri pirkojiri pirko633.71%23.45%
bjorn morkbjorn mork362.12%11.72%
jesse grossjesse gross301.77%11.72%
david s. millerdavid s. miller271.59%23.45%
stefan hajnoczistefan hajnoczi261.53%11.72%
jeff garzikjeff garzik251.47%23.45%
michael ellermanmichael ellerman221.30%11.72%
johannes bergjohannes berg211.24%11.72%
duan jiongduan jiong211.24%11.72%
linus torvaldslinus torvalds191.12%23.45%
stefan assmannstefan assmann191.12%11.72%
paolo giarrussopaolo giarrusso191.12%11.72%
tobias klausertobias klauser191.12%11.72%
tom herberttom herbert150.88%11.72%
ben hutchingsben hutchings110.65%23.45%
peter p waskiewiczpeter p waskiewicz100.59%11.72%
jesse brandeburgjesse brandeburg60.35%11.72%
danny kukawkadanny kukawka50.29%11.72%
arnd bergmannarnd bergmann30.18%11.72%
randy dunlaprandy dunlap10.06%11.72%
Total1698100.00%58100.00%
Directory: include/linux
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