[ofa-general] Re: [PATCH] iser: avoid recv buf exhaustion v2

[David Disseldorp]

Ping, anyone had a chance to look over this one?

Cheers, Dave

On Wed, 26 Nov 2008 16:19:22 +1100
David Disseldorp <ddiss at sgi.com> wrote:

> iSCSI/iSER targets may send PDUs without a prior request from the initiator,
> RFC 5046 refers to these PDUs as "unexpected". NOP-In PDUs with itt=RESERVED
> and Asynchronous Message PDUs occupy this category.
> 
> The amount of active "unexpected" PDU's an iSER target may have at any time is
> governed by the MaxOutstandingUnexpectedPDUs key, which is not yet supported.
> 
> Currently when an iSER target sends an "unexpected" PDU, the initiators recv
> buffer consumed by the PDU is not replaced. If over initial_post_recv_bufs_num
> "unexpected" PDUs are received then the receive queue will run out of receive
> work requests.
> 
> This patch ensures recv buffers consumed by "unexpected" PDUs are replaced
> in the next iser_post_receive_control() call.
> 
> Version 2:
> o replace unexpected recv bufs in iser_post_receive_control, transparent
>   to iser_send_* functions.