Introduction; Hardware Requirements - Chelsio Communications Terminator series Installation And User Manual

Chapter IV. iSCSI PDU Offload Target

1. Introduction

Chelsio iSCSI PDU Offload Target (cxgbei.ko) is the hardware accelerated iSCSI target module
for Chelsio TOE capable adapters supported by NIC driver (if_cxgbe) and provides support for
offloading iSCSI traffic.
On the host side the driver interacts with the storage stack via the ICL (iSCSI Common Layer) in
the kernel. On the wire, standard iSCSI traffic (SCSI over TCP as per RFC 3720/7143 etc.)
interoperates with all other standards compliant implementations. The driver is layered on top of
the TOE driver (t4_tom) and promotes connections being handled by t4_tom in iSCSI ULP
(Upper Layer Protocol) mode. The driver provides hardware assistance including:

Full TCP processing.

iSCSI PDU identification and recovery within the TCP stream.

Header and/or data digest insertion (Tx) and verification (Rx).

Zero copy (both Tx and Rx).
This product will be supported in the next release.
Note
1.1.

Hardware Requirements

1.1.1. Supported Adapters
The following are the currently shipping Chelsio adapters that are compatible with iSCSI PDU
Offload Target software:
T580-CR
T580-LP-CR
T540-CR
T520-CR
T520-LL-CR
T420-CR
T420-LL-CR
T440-CR
T440-LP-CR
T422-CR
T420-CX
T420-BT
T404-BT
Chelsio Unified Wire for FreeBSD
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