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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2009-04-21 19:26:23 -0400
committerDavid S. Miller <davem@davemloft.net>2009-04-23 07:04:33 -0400
commitb8942e3b6c4b35dda5e8ca75aec5e2f027fe39a9 (patch)
tree1d89b4fc4aa5d327c0c43feb4281b1a3aa6e0a23 /net/iucv/iucv.c
parent9d5c5d8f4105dc56ec10864b195dd1714f282c22 (diff)
af_iucv: Support data in IUCV msg parameter lists (IPRMDATA)
The patch allows to send and receive data in the parameter list of an iucv message. The parameter list is an arry of 8 bytes that are used by af_iucv as follows: 0..6 7 bytes for socket data and 7 1 byte to store the data length. Instead of storing the data length directly, the difference between 0xFF and the data length is used. This convention does not interfere with the existing use of PRM messages for shutting down the send direction of an AF_IUCV socket (shutdown() operation). Data lenghts greater than 7 (or PRM message byte 8 is less than 0xF8) denotes to special messages. Currently, the special SEND_SHUTDOWN message is supported only. To use IPRM messages, both communicators must set the IUCV_IPRMDATA flag during path negotiation, i.e. in iucv_connect() and path_pending(). To be compatible to older af_iucv implementations, sending PRM messages is controlled by the socket option SO_IPRMDATA_MSG. Receiving PRM messages does not depend on the socket option (but requires the IUCV_IPRMDATA path flag to be set). Sending/Receiving data in the parameter list improves performance for small amounts of data by reducing message_completion() interrupts and memory copy operations. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/iucv/iucv.c')
-rw-r--r--net/iucv/iucv.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index fcf404065f12..61e8038a55ee 100644
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -1388,6 +1388,8 @@ static void iucv_path_complete(struct iucv_irq_data *data)
1388 struct iucv_path_complete *ipc = (void *) data; 1388 struct iucv_path_complete *ipc = (void *) data;
1389 struct iucv_path *path = iucv_path_table[ipc->ippathid]; 1389 struct iucv_path *path = iucv_path_table[ipc->ippathid];
1390 1390
1391 if (path)
1392 path->flags = ipc->ipflags1;
1391 if (path && path->handler && path->handler->path_complete) 1393 if (path && path->handler && path->handler->path_complete)
1392 path->handler->path_complete(path, ipc->ipuser); 1394 path->handler->path_complete(path, ipc->ipuser);
1393} 1395}