公开(公告)号：GB2491440B

公开(公告)日：2013-05-15

申请号：GB201206684

申请日：2012-04-17

Applicant: IBM

Inventor： CASPER DANIEL FRANCIS ,  FLANAGAN JOHN R ,  BUBB CLINTON ,  BENDER CARL ALFRED

IPC: G06F13/12 ,  H04L69/40

Abstract: A computer program product is provided for performing input/output (I/O) processing. The computer program product is configured to perform: generating and storing in local channel memory at least one address control word (ACW) specifying one or more host memory locations for data transfer and including a data discard field; generating an address control structure specifying a local channel memory location of a corresponding ACW; receiving one or more data transfer requests from a network interface that each corresponding address control structure information; accessing an ACW and routing the data transfer request to a host memory location specified in the ACW; and responsive to encountering an error during at least one of the accessing and the routing, discarding the one or more data transfer requests and setting the data discard field to a value configured to instruct a channel to discard any subsequent data transfer requests associated with the ACW.

公开(公告)号：GB2491437B

公开(公告)日：2013-05-15

申请号：GB201206681

申请日：2012-04-17

Applicant: IBM

Inventor： CASPER DANIEL FRANCIS ,  FLANAGAN JOHN R ,  BUBB CLINTON

IPC: G06F13/12 ,  G06F13/38

公开(公告)号：GB2491436B

公开(公告)日：2013-05-15

申请号：GB201206680

申请日：2012-04-17

Applicant: IBM

Inventor： CASPER DANIEL FRANCIS ,  FLANAGAN JOHN R ,  BUBB CLINTON

IPC: G06F13/12 ,  G06F13/38 ,  G06F13/42 ,  G06F21/60

Abstract: A computer program product is provided for performing a method including: obtaining information relating to an I/O operation at a channel subsystem in a host computer system; generating at least one address control word (ACW) in the local channel memory specifying one or more host memory locations for transfer of data between the host and a control unit and including at least one ACW error checking field; generating an address control structure specifying a location in the local channel memory of a corresponding ACW and including at least one address control structure error checking field; receiving a data transfer request from the network interface that includes the addressing information; comparing the at least one ACW error checking field to the at least one address control structure error checking field; and, responsive to the fields matching, routing the data transfer request to the host memory location specified in the corresponding ACW.

公开(公告)号：GB2491440A

公开(公告)日：2012-12-05

申请号：GB201206684

申请日：2012-04-17

Applicant: IBM

Inventor： CASPER DANIEL FRANCIS ,  FLANAGAN JOHN R ,  BUBB CLINTON ,  BENDER CARL ALFRED

IPC: G06F13/12

Abstract: A method for performing an input/output (I/O) operation between a host computer (102) and control-unit (118) comprises obtaining information about the I/O operation from a channel subsystem (128) in the host system, the channel having a local processor and memory. An Address Control Word (ACW) (Fig 11) is generated and specifying the memory location and having a data discard field (264, Fig 11). An address control structure (Fig 5) for each data transfer in the I/O operation is generated and forwarded to the network interface between the channel subsystem and I/O device and specifies a location in the local memory of the ACW. On receipt of an I/O command message via the network a data transfer request from the network interface is issued and includes addressing information and the corresponding ACW is accessed retrieved and used to route the data transfer request to the host memory (106) specified in the ACW. In response to an error during the accessing or the routing, the transfer is discarded and the data discard field is configured to instruct the channel to discard any subsequent data transfer requests associated with the ACW.