iSCSI : Bridging missing CmdSNs and Abort I/O Error recovery

[Santosh Rao <santoshr@cup.hp.com>]

Julian & All,

The draft is currently lacking a section that addresses abort I/O error
recovery. Specifically, how is CmdSN bridging issues to be handled in
the case where an initiator chooses not to retry an I/O [that failed on
a connection failure that affects the delivery of the command to the
target or a digest error at the target] because its ULP timer may have
expired.

In such cases, the initiator can send an Abort Task to inform the target
that the I.T.T is being aborted and its corresponding CmdSN can be
bridged, instead of having the target stall infinitely in its attempt to
enforce ordering and await the missing CmdSN [which is'nt going to
arrive, because the initiator did not retry the command].

Regards,
Santosh
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