| US 7,581,015 B2 | ||
| Communication device having transmitting and receiving units supports RDMA communication | ||
| Kota Nakashima, Kawasaki (Japan); and Kouichi Kumon, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Jun. 28, 2006, as Appl. No. 11/475,908. | ||
| Claims priority of application No. 2006-083185 (JP), filed on Mar. 24, 2006. | ||
| Prior Publication US 2006/0274748 A1, Dec. 07, 2006 | ||
| Int. Cl. G06F 15/16 (2006.01) | ||
| U.S. Cl. 709—230 [709/236; 709/237] | 32 Claims |
| 1. A communication device for supporting RDMA communication having a transmitting unit for generating and transmitting an
RDMA packet and a receiving unit for receiving the RDMA packet, the communication device is characterized in that the transmitting
unit has
a packet transmitting unit for, when a data transfer request is received, generating the RDMA packet from transfer data and
speculatively transmitting the packet without inquiring the transfer destination about presence or absence of reception permission,
a packet retransmitting unit for, when a retransmission request is received from the transfer destination, generating the
RDMA packet from the requested transfer data and transmitting the packet, and
a transmission completion unit for receiving a transfer completion notification from the transfer destination and normally
terminating the packet transmission; and
the receiving unit has
a transfer area control unit for controlling transfer area control information including transfer permission or transfer unpermission
with respect to a receiving area,
a packet receiving unit for, if transfer permission of the receiving area is determined by referencing the transfer area control
information upon packet reception, transferring the received packet to the receiving area and changing the transfer permission
of the receiving area to transfer unpermission,
a packet discarding unit for, if transfer unpermission of the receiving area is determined by referencing the transfer area
control information upon packet reception, discarding the received packet and recording the discarding of the packet in the
transfer area control information,
a retransmission requesting unit for, if transfer permission of the receiving area is determined after the received packet
is discarded by the packet discarding unit, transmitting a retransmission request to the transfer source based on the record
of the packet discarding of the transfer area control information, and
a completion notifying unit for recognizing transfer completion of the received packet with respect to the receiving area
and transmitting a transfer completion notification.
|