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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/** Interface related functions
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*
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* These functions are used to manage a network interface.
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* Most of them make use of Linux-specific APIs.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014, Institute for Automation of Complex Power Systems, EONERC
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* @file
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*/
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#ifndef _IF_H_
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#define _IF_H_
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#include <sys/types.h>
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#include <net/if.h>
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#define IF_NAME_MAX IFNAMSIZ /**< Maximum length of an interface name */
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#define IF_IRQ_MAX 3 /**< Maxmimal number of IRQs of an interface */
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/** Interface data structure */
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struct interface {
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/** The index used by the kernel to reference this interface */
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int index;
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/** How many nodes use this interface for outgoing packets */
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int refcnt;
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/** Human readable name of this interface */
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char name[IF_NAME_MAX];
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/** List of IRQs of the NIC */
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char irqs[IF_IRQ_MAX];
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/** Linked list pointer */
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struct interface *next;
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};
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/** Get outgoing interface.
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*
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* Does a lookup in the kernel routing table to determine
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* the interface which sends the data to a certain socket
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* address.
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*
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* @param sa A destination address for outgoing packets.
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* @return The interface index.
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*/
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int if_getegress(struct sockaddr_in *sa);
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/** Get all IRQs for this interface.
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*
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* Only MSI IRQs are determined by looking at:
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* /sys/class/net/{ifname}/device/msi_irqs/
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*
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* @param i A pointer to the interface structure
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* @retval 0 Success. Everything went well.
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* @retval <0 Error. Something went wrong.
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*/
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int if_getirqs(struct interface *i);
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/** Change the SMP affinity of NIC interrupts.
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*
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* @param i A pointer to the interface structure
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* @param affinity A mask specifying which cores should handle this interrupt.
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* @retval 0 Success. Everything went well.
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* @retval <0 Error. Something went wrong.
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*/
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int if_setaffinity(struct interface *i, int affinity);
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/** Search the list of interfaces for a given index.
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*
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* @param index The interface index to search for
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* @param interfaces A linked list of all interfaces
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* @retval NULL if no interface with index was found.
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* @retval >0 Success. A pointer to the interface.
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*/
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struct interface* if_lookup_index(int index, struct interface *interfaces);
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#endif /* _IF_H_ */
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