[stgt] iSER over iWARP

[Sushma R]

Thanks Or for your inputs.
Could you please let me know whenever the solution with this fix is
available for use?



On Sat, Oct 5, 2013 at 10:33 PM, Or Gerlitz <ogerlitz at mellanox.com> wrote:
> On 04/10/2013 02:20, Sushma R wrote:
>>
>> I experimented around a bit and here are my observations:
>>
>> 1. tgtd (Version 1.0.24) which comes with CentOS 6.4 distribution
>> doesn't have iSER support. Configured targets as iscsi/tcp. Initiator
>> is able to discover the target and login successfully.
>> 2. Compiled latest code from git tree (Version 1.0.39) in iSCSI mode
>> and configured targets as iscsi/tcp. Initiator is still able to
>> discover targets and login successfully.
>> 3. Compiled code from git tree (Version 1.0.39) for iSER support and
>> configured targets as iscsi/tcp. Initiator fails to discover targets.
>> Same is the case when the targets are configured as iser.
>
>
> Oh, I think I got it.. when you enable iser we open an RDMA listerner on the
> RDMA equivalent of the iSCSI TCP port (say 3260),
> but the iSCSI TCP part of TGT does this too. You might end up with a mess, I
> guess.
>
> With IB and RoCE the problem doesn't exist, only with iWARP, since it uses
> TCP under the RDMA cover. its called
> the "port space" problem, a solution to solve that was recently submitted
> upstream but has some way to go before
> merged and available to use.
>
>
>>
>> 1542.231217 10.196.86.16 -> 10.196.86.101 iSCSI Login Command
>> 1542.231271 10.196.86.101 -> 10.196.86.16 TCP iscsi-target > 53665 [ACK]
>> Seq=1 Ack=49 Win=262096 Len=0 TSV=1890672 TSER=2186863
>> 1542.231287 10.196.86.101 -> 10.196.86.16 TCP iscsi-target > 53665 [ACK]
>> Seq=1 Ack=293 Win=261848 Len=0 TSV=1890672 TSER=2186863
>> 1542.231295 10.196.86.101 -> 10.196.86.16 TCP iscsi-target > 53665 [RST,
>> ACK] Seq=1 Ack=293 Win=0 Len=0
>> 1543.231575 10.196.86.16 -> 10.196.86.101 TCP 53666 > iscsi-target [SYN]
>> Seq=0 Win=14600 Len=0 MSS=1460 TSV=2187863 TSER=0 WS=7
>> 1543.231670 10.196.86.101 -> 10.196.86.16 TCP iscsi-target > 53666 [SYN,
>> ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=3 TSV=1891339 TSER=2187863
>> 1543.231688 10.196.86.16 -> 10.196.86.101 TCP 53666 > iscsi-target [ACK]
>> Seq=1 Ack=1 Win=14720 Len=0 TSV=2187864 TSER=1891339
>> 1543.231753 10.196.86.16 -> 10.196.86.101 TCP [TCP segment of a
>> reassembled PDU]
>
>
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