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[AF_IUCV]: postpone receival of iucv-packets

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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>
This commit is contained in:
Ursula Braun
2007-10-08 02:03:31 -07:00
committed by David S. Miller
parent 57f2044803
commit f0703c80e5
2 changed files with 132 additions and 86 deletions
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7
include/net/iucv/af_iucv.h
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@ -50,6 +50,12 @@ struct sockaddr_iucv {
/* Common socket structures and functions */
struct sock_msg_q {
struct iucv_path *path;
struct iucv_message msg;
struct list_head list;
spinlock_t lock;
};
#define iucv_sk(__sk) ((struct iucv_sock *) __sk)
@ -65,6 +71,7 @@ struct iucv_sock {
struct iucv_path *path;
struct sk_buff_head send_skb_q;
struct sk_buff_head backlog_skb_q;
struct sock_msg_q message_q;
unsigned int send_tag;
};