mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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124 lines
No EOL
3.8 KiB
C
124 lines
No EOL
3.8 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 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/** @addtogroup fpga Kernel @{ */
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#pragma once
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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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struct rtnl_link *nl_link; /**< libnl3: Handle of interface. */
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struct rtnl_qdisc *tc_qdisc; /**< libnl3: Root priority queuing discipline (qdisc). */
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char irqs[IF_IRQ_MAX]; /**< List of IRQs of the NIC. */
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int affinity; /**< IRQ / Core Affinity of this interface. */
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struct list sockets; /**< Linked list of associated 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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int if_init(struct interface * , 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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int 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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* @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);
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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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/** @} */ |