[ewg] [PATCH RFC ofed-1.4] RDMA/CMA: Allocate PS_TCP ports from the host TCP port space

[Steve Wise]

Steve Wise wrote:
> Tziporet & EWG members,
>
> iWARP customers including Sandia Labs have asked that we include this 
> in OFED distributions to correctly unify the
> host stack and iwarp stack TCP port space.
>
> I recommend we maintain this patch as part of the OFED distribution.
>
> I you agree, then we can pull this in as a patch file in 
> kernel_patches/fixes/ for ofed-1.4.
>
> Thanks,
>
> Steve.
>


For background, here are threads where this issue was discussed.

Here is where the issue was discussed on the open fabrics list:

http://lists.openfabrics.org/pipermail/general/2007-July/038885.html

Here is where the linux maintainers NAK'd any such patch:

http://marc.info/?l=linux-netdev&m=118649771614456&w=2


While the linux community hasn't yet resolved this issue, I think the 
OFA must do something.

Currently, the iwarp stack and the native stack don't synchronize their 
ports and under heavy loads there can be collisions that will be very 
hard to debug.  I believe the OFA should at least provide _some_ 
solution in OFED to ensure correctness.  The patch is simple and solves 
the problem at the expense of allocating a kernel socket (ie wasting 
some memory).

I will pledge to work with Sean and Roland and the netdev maintainers to 
try get something upstream.  Once that happens, we'll align the OFED 
code accordingly.


Steve.