f0703c80e5
AF_IUCV socket programs may waste Linux storage, because af_iucv allocates an skb whenever posted by the receive callback routine and receives the message immediately. Message receival is now postponed if data from previous callbacks has not yet been transferred to the receiving socket program. Instead a message handle is saved in a message queue as a reminder. Once messages could be given to the receiving socket program, there is an additional checking for entries in the message queue, followed by skb allocation and message receival if applicable. Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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* Copyright 2006 IBM Corporation
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* IUCV protocol stack for Linux on zSeries
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* Version 1.0
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* Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
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*
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*/
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#ifndef __AFIUCV_H
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#define __AFIUCV_H
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#include <asm/types.h>
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#include <asm/byteorder.h>
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#include <linux/list.h>
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#include <linux/poll.h>
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#include <linux/socket.h>
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#ifndef AF_IUCV
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#define AF_IUCV 32
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#define PF_IUCV AF_IUCV
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#endif
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/* Connection and socket states */
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enum {
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IUCV_CONNECTED = 1,
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IUCV_OPEN,
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IUCV_BOUND,
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IUCV_LISTEN,
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IUCV_SEVERED,
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IUCV_DISCONN,
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IUCV_CLOSING,
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IUCV_CLOSED
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};
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#define IUCV_QUEUELEN_DEFAULT 65535
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#define IUCV_CONN_TIMEOUT (HZ * 40)
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#define IUCV_DISCONN_TIMEOUT (HZ * 2)
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#define IUCV_CONN_IDLE_TIMEOUT (HZ * 60)
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#define IUCV_BUFSIZE_DEFAULT 32768
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/* IUCV socket address */
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struct sockaddr_iucv {
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sa_family_t siucv_family;
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unsigned short siucv_port; /* Reserved */
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unsigned int siucv_addr; /* Reserved */
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char siucv_nodeid[8]; /* Reserved */
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char siucv_user_id[8]; /* Guest User Id */
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char siucv_name[8]; /* Application Name */
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};
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/* Common socket structures and functions */
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struct sock_msg_q {
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struct iucv_path *path;
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struct iucv_message msg;
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struct list_head list;
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spinlock_t lock;
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};
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#define iucv_sk(__sk) ((struct iucv_sock *) __sk)
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struct iucv_sock {
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struct sock sk;
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char src_user_id[8];
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char src_name[8];
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char dst_user_id[8];
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char dst_name[8];
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struct list_head accept_q;
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spinlock_t accept_q_lock;
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struct sock *parent;
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struct iucv_path *path;
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struct sk_buff_head send_skb_q;
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struct sk_buff_head backlog_skb_q;
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struct sock_msg_q message_q;
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unsigned int send_tag;
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};
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struct iucv_sock_list {
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struct hlist_head head;
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rwlock_t lock;
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atomic_t autobind_name;
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};
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unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
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poll_table *wait);
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void iucv_sock_link(struct iucv_sock_list *l, struct sock *s);
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void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *s);
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int iucv_sock_wait_state(struct sock *sk, int state, int state2,
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unsigned long timeo);
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int iucv_sock_wait_cnt(struct sock *sk, unsigned long timeo);
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void iucv_accept_enqueue(struct sock *parent, struct sock *sk);
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void iucv_accept_unlink(struct sock *sk);
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struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock);
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#endif /* __IUCV_H */
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