Commit 583be982 authored by Jeremy Kerr's avatar Jeremy Kerr Committed by David S. Miller
Browse files

mctp: Add device handling and netlink interface 



This change adds the infrastructure for managing MCTP netdevices; we add
a pointer to the AF_MCTP-specific data to struct netdevice, and hook up
the rtnetlink operations for adding and removing addresses.

Includes changes from Matt Johnston <matt@codeconstruct.com.au>.

Signed-off-by: default avatarJeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4b2e6930

MAINTAINERS

+1 −0
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@@ -11039,6 +11039,7 @@ L: netdev@vger.kernel.org 
S:	Maintained

F:	drivers/net/mctp/

F:	include/net/mctp.h

F:	include/net/mctpdevice.h

F:	net/mctp/









MAN-PAGES: MANUAL PAGES FOR LINUX -- Sections 2, 3, 4, 5, and 7
































include/linux/netdevice.h



+4
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@@ -1823,6 +1823,7 @@ enum netdev_ml_priv_type {







 *	@ieee802154_ptr: IEEE 802.15.4 low-rate Wireless Personal Area Network









 *			 device struct









 *	@mpls_ptr:	mpls_dev struct pointer









 *	@mctp_ptr:	MCTP specific data









 *









 *	@dev_addr:	Hw address (before bcast,









 *			because most packets are unicast)








@@ -2110,6 +2111,9 @@ struct net_device {







#if IS_ENABLED(CONFIG_MPLS_ROUTING)









	struct mpls_dev __rcu	*mpls_ptr;









#endif









#if IS_ENABLED(CONFIG_MCTP)









	struct mctp_dev __rcu	*mctp_ptr;









#endif



















/*









 * Cache lines mostly used on receive path (including eth_type_trans())
































include/net/mctp.h



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@@ -10,6 +10,7 @@







#define __NET_MCTP_H



















#include <linux/bits.h>









#include <linux/mctp.h>



















/* MCTP packet definitions */









struct mctp_hdr {








@@ -32,4 +33,17 @@ struct mctp_hdr {







#define MCTP_HDR_TAG_SHIFT	0









#define MCTP_HDR_TAG_MASK	GENMASK(2, 0)



















static inline bool mctp_address_ok(mctp_eid_t eid)









{









	return eid >= 8 && eid < 255;









}



















static inline struct mctp_hdr *mctp_hdr(struct sk_buff *skb)









{









	return (struct mctp_hdr *)skb_network_header(skb);









}



















void mctp_device_init(void);









void mctp_device_exit(void);



















#endif /* __NET_MCTP_H */
























include/net/mctpdevice.h
0 → 100644



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/* SPDX-License-Identifier: GPL-2.0 */









/*









 * Management Component Transport Protocol (MCTP) - device









 * definitions.









 *









 * Copyright (c) 2021 Code Construct









 * Copyright (c) 2021 Google









 */



















#ifndef __NET_MCTPDEVICE_H









#define __NET_MCTPDEVICE_H



















#include <linux/list.h>









#include <linux/types.h>









#include <linux/refcount.h>



















struct mctp_dev {









	struct net_device	*dev;



















	unsigned int		net;



















	/* Only modified under RTNL. Reads have addrs_lock held */









	u8			*addrs;









	size_t			num_addrs;









	spinlock_t		addrs_lock;



















	struct rcu_head		rcu;









};



















#define MCTP_INITIAL_DEFAULT_NET	1



















struct mctp_dev *mctp_dev_get_rtnl(const struct net_device *dev);









struct mctp_dev *__mctp_dev_get(const struct net_device *dev);



















#endif /* __NET_MCTPDEVICE_H */
























include/uapi/linux/if_ether.h



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@@ -151,6 +151,9 @@







#define ETH_P_MAP	0x00F9		/* Qualcomm multiplexing and









					 * aggregation protocol









					 */









#define ETH_P_MCTP	0x00FA		/* Management component transport









					 * protocol packets









					 */



















/*









 *	This is an Ethernet frame header.