Bug 503521

=Comment: #0=================================================
Emily J. Ratliff <ratliff.com> - 
1. Feature Overview:
Feature Id:	[201885]
a. Name of Feature:	AF_IUCV SOCK_SEQPACKET support
b. Feature Description
Offer AF_IUCV datagram stream-oriented sockets in addition to the existing AF_IUCV byte
stream-oriented sockets
 man 2 socket:
 SOCK_SEQPACKET  	Provides  a sequenced, reliable, two-way connection-based data transmission path
for datagrams of fixed maximum length; a consumer is required to read an entire packet with each
input system call.

2. Feature Details:
Sponsor:	zSeries
Architectures:
s390x

Arch Specificity: Purely Arch Specific Code
Affects Kernel Modules: Yes
Delivery Mechanism: Backport
Category:	Networking
Request Type:	Kernel - Enhancement from IBM
d. Upstream Acceptance:	In Progress
Sponsor Priority	1
f. Severity: High
IBM Confidential:	no
Code Contribution:	IBM code
g. Component Version Target:	2.6.31

3. Business Case
IUCV is an important z/VM communication facility. The Linux AF-IUCV protocol support facilitates
exploitation of IUCV-communication through a socket interface. Enhancing the existing byte
stream-oriented AF-IUCV protocol support in Linux (SOCK_STREAM) to support also fixed max. length
datagram-oriented sockets (SOCK_SEQPACKET) enables applications to benefit from Linux AF_IUCV
sockets, if their socket data to be transferred cannot be fragmented. One such future application in
z/VSE is already identified. In general, this feature improves the close collaboration between Linux
on System z and z/VM in the networking area.

4. Primary contact at Red Hat: 
John Jarvis
jjarvis

5. Primary contacts at Partner:
Project Management Contact:
Hans-Georg Markgraf, mgrf.com, Boeblingen 49-7031-16-3978

Technical contact(s):
Gonzalo Muelas Serrano, gmuelas.com

IBM Manager:
Thomas Schwarz, t.schwarz.com