On 11/25/2015 10:22 AM, Or Gerlitz wrote:
On Wed, Nov 25, 2015 at 7:09 PM, santosh shilimkar
<santosh.shilimkar@xxxxxxxxxx> wrote:
As already indicated to Sagi [1], RDS IB FR support is work in
progress and I was hoping to get it ready for 4.5.
These are really good news! can you please elaborate a bit on the
design changes this move introduced in RDS?
Yeah. It has been a bit of pain point since the need
was to keep the RDS design same and retrofit the FR
support so that it can co-exist with existing deployed
FMR code.
Leaving the details for the code review but at very high
level,
- Have to split the poll CQ handling so that
send + FR WR completion can be handled together.
FR CQ handler and reg/inv WR prep marks the MR state
like INVALID, VALID & STALE appropriately.
- Allocate 2X space on WR and WC queues during queue setup.
- Manage the MR reg/inv based on the space available
in FR WR ring(actually it is just a counter). This is
bit tricky because RDS does MR operation via sendmsg()
as well as directly through socket APIs so needs
co-ordination.
Am hoping that above remains true when code actually
makes to the list but that is how things stand as
of now.
Regards,
Santosh
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