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122 lines
3.6 KiB
C
122 lines
3.6 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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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2015, Institute for Automation of Complex Power Systems, EONERC
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* This file is part of S2SS. All Rights Reserved. Proprietary and confidential.
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* Unauthorized copying of this file, via any medium is strictly prohibited.
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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 <sys/socket.h>
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#include "list.h"
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#define IF_IRQ_MAX 3 /**< Maxmimal number of IRQs of an interface */
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#ifndef SO_MARK
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#define SO_MARK 36 /**< Workaround: add missing constant for OPAL-RT Redhawk target */
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#endif
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struct socket;
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struct nl_addr;
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struct rtnl_link;
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/** Interface data structure */
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struct interface {
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/** libnl3: Handle of interface */
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struct rtnl_link *nl_link;
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/** libnl3: Root prio qdisc */
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struct rtnl_qdisc *tc_qdisc;
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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 of associated sockets */
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struct list sockets;
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};
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/** Add a new interface to the global list and lookup name, irqs...
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*
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* @param link The libnl3 link handle
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* @retval >0 Success. A pointer to the new interface.
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* @retval 0 Error. The creation failed.
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*/
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struct interface * if_create(struct rtnl_link *link);
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/** Destroy interface by freeing dynamically allocated memory.
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*
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* @param i A pointer to the interface structure.
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*/
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void if_destroy(struct interface *i);
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/** Start interface.
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*
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* This setups traffic controls queue discs, network emulation and
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* maps interface IRQs according to affinity.
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*
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* @param i A pointer to the interface structure.
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* @param affinity Set the IRQ affinity of this interface.
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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_start(struct interface *i, int affinity);
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/** Stop interface
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*
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* This resets traffic qdiscs ant network emulation
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* and maps interface IRQs to all CPUs.
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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_stop(struct interface *i);
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/** Lookup routing tables to get the interface on which packets for a certain destination
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* will leave the system.
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*
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* @param[in] sa The destination address for outgoing packets.
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* @param[out] link The egress interface.
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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_get_egress(struct sockaddr *sa, struct rtnl_link **link);
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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_get_irqs(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_set_affinity(struct interface *i, int affinity);
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/** Search the global 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);
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#endif /* _IF_H_ */
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