Commit 3881ac44 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

af_iucv: add HiperSockets transport 



The current transport mechanism for af_iucv is the z/VM offered
communications facility IUCV. To provide equivalent support when
running Linux in an LPAR, HiperSockets transport is added to the
AF_IUCV address family. It requires explicit binding of an AF_IUCV
socket to a HiperSockets device. A new packet_type ETH_P_AF_IUCV
is announced. An af_iucv specific transport header is defined
preceding the skb data. A small protocol is implemented for
connecting and for flow control/congestion management.

Signed-off-by: default avatarUrsula Braun <ursula.braun@de.ibm.com>
Signed-off-by: default avatarFrank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 4dc83dfd

include/net/iucv/af_iucv.h

+52 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/list.h>

#include <linux/poll.h>

#include <linux/socket.h>

#include <net/iucv/iucv.h>



#ifndef AF_IUCV

#define AF_IUCV		32
@@ -33,6 +34,7 @@ enum { 
};



#define IUCV_QUEUELEN_DEFAULT	65535

#define IUCV_HIPER_MSGLIM_DEFAULT	128

#define IUCV_CONN_TIMEOUT	(HZ * 40)

#define IUCV_DISCONN_TIMEOUT	(HZ * 2)

#define IUCV_CONN_IDLE_TIMEOUT	(HZ * 60)
@@ -57,8 +59,51 @@ struct sock_msg_q { 
	spinlock_t		lock;

};



#define AF_IUCV_FLAG_ACK 0x1

#define AF_IUCV_FLAG_SYN 0x2

#define AF_IUCV_FLAG_FIN 0x4

#define AF_IUCV_FLAG_WIN 0x8



struct af_iucv_trans_hdr {

	u16 magic;

	u8 version;

	u8 flags;

	u16 window;

	char destNodeID[8];

	char destUserID[8];

	char destAppName[16];

	char srcNodeID[8];

	char srcUserID[8];

	char srcAppName[16];             /* => 70 bytes */

	struct iucv_message iucv_hdr;    /* => 33 bytes */

	u8 pad;                          /* total 104 bytes */

} __packed;



enum iucv_tx_notify {

	/* transmission of skb is completed and was successful */

	TX_NOTIFY_OK = 0,

	/* target is unreachable */

	TX_NOTIFY_UNREACHABLE = 1,

	/* transfer pending queue full */

	TX_NOTIFY_TPQFULL = 2,

	/* general error */

	TX_NOTIFY_GENERALERROR = 3,

	/* transmission of skb is pending - may interleave

	 * with TX_NOTIFY_DELAYED_* */

	TX_NOTIFY_PENDING = 4,

	/* transmission of skb was done successfully (delayed) */

	TX_NOTIFY_DELAYED_OK = 5,

	/* target unreachable (detected delayed) */

	TX_NOTIFY_DELAYED_UNREACHABLE = 6,

	/* general error (detected delayed) */

	TX_NOTIFY_DELAYED_GENERALERROR = 7,

};



#define iucv_sk(__sk) ((struct iucv_sock *) __sk)



#define AF_IUCV_TRANS_IUCV 0

#define AF_IUCV_TRANS_HIPER 1



struct iucv_sock {

	struct sock		sk;

	char			src_user_id[8];
@@ -75,6 +120,13 @@ struct iucv_sock { 
	unsigned int		send_tag;

	u8			flags;

	u16			msglimit;

	u16			msglimit_peer;

	atomic_t		msg_sent;

	atomic_t		msg_recv;

	atomic_t		pendings;

	int			transport;

	void                    (*sk_txnotify)(struct sk_buff *skb,

					       enum iucv_tx_notify n);

};



/* iucv socket options (SOL_IUCV) */

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