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1fa17d4ba4
The AF_CAN core delivered always cloned sk_buffs to the AF_CAN protocols, although this was _only_ needed by the can-raw protocol. With this (additionally documented) change, the AF_CAN core calls the callback functions of the registered AF_CAN protocols with the original (uncloned) sk_buff pointer and let's the can-raw protocol do the skb_clone() itself which omits all unneeded skb_clone() calls for other AF_CAN protocols. Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net> Signed-off-by: Urs Thuermann <urs.thuermann@volkswagen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* linux/can/core.h
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*
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* Protoypes and definitions for CAN protocol modules using the PF_CAN core
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*
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* Authors: Oliver Hartkopp <oliver.hartkopp@volkswagen.de>
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* Urs Thuermann <urs.thuermann@volkswagen.de>
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* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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* All rights reserved.
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*
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* Send feedback to <socketcan-users@lists.berlios.de>
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*
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*/
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#ifndef CAN_CORE_H
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#define CAN_CORE_H
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#include <linux/can.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#define CAN_VERSION "20090105"
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/* increment this number each time you change some user-space interface */
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#define CAN_ABI_VERSION "8"
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#define CAN_VERSION_STRING "rev " CAN_VERSION " abi " CAN_ABI_VERSION
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#define DNAME(dev) ((dev) ? (dev)->name : "any")
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/**
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* struct can_proto - CAN protocol structure
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* @type: type argument in socket() syscall, e.g. SOCK_DGRAM.
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* @protocol: protocol number in socket() syscall.
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* @capability: capability needed to open the socket, or -1 for no restriction.
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* @ops: pointer to struct proto_ops for sock->ops.
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* @prot: pointer to struct proto structure.
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*/
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struct can_proto {
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int type;
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int protocol;
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int capability;
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struct proto_ops *ops;
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struct proto *prot;
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};
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/* function prototypes for the CAN networklayer core (af_can.c) */
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extern int can_proto_register(struct can_proto *cp);
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extern void can_proto_unregister(struct can_proto *cp);
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extern int can_rx_register(struct net_device *dev, canid_t can_id,
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canid_t mask,
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void (*func)(struct sk_buff *, void *),
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void *data, char *ident);
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extern void can_rx_unregister(struct net_device *dev, canid_t can_id,
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canid_t mask,
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void (*func)(struct sk_buff *, void *),
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void *data);
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extern int can_send(struct sk_buff *skb, int loop);
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#endif /* CAN_CORE_H */
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