On Sep 19, 2012, at 11:58 AM, Alex Rosenbaum <al...@mellanox.com> wrote:
> Since we use the RDMA_PS_IPOIB we need librdmacm to help get the correct > pkey_index and qkey (in INIT->RTR transition) to match IPoIB's UD QP own > values. If not, than our user space UD QP will not be able to send/recv from > IPoIB on remote machines (which is what we want to gain by using the IPOIB > port space). > > Maybe we can save the values used from the rdma_create_qp and reuse them once > modify the UD QP state by libverbs (ibv_modify_qp). > It would be nice if we had access to the rdma's modify qp wrapper to do this > nicely from application level. I too would be interested in bringing a QP from error back to a usable state. I have been debating whether to reconnect using the current RDMA calls versus trying to transition the existing RC QP. I assumed to transition the existing QP that I would need to open a socket to coordinate the two sides. Is that correct? If I were instead to use rdma_connect(), does it require a new CM id or just a new QP within the same id? Thanks, Scott > -----Original Message----- > From: Or Gerlitz > Sent: Wednesday, September 19, 2012 6:53 PM > To: Alex Rosenbaum > Cc: Hefty, Sean; linux-rdma (linux-rdma@vger.kernel.org) > Subject: Re: how to preserve QP over HA events for librdmacm applications > > On 19/09/2012 18:48, Hefty, Sean wrote: >>> Can this flushing be somehow done with the current >>> librdmacm/libibverbs APIs or we need some enhancement? >> You can call verbs directly to transition the QP state. That leaves the CM >> state unchanged, which doesn't really matter for UD QPs anyway. >> >> > > Alex, > > Any reason we can't deploy this hack? is that for the IPoIB port space it > would require copying some low level code from librdmacm or even from the > kernel? e.g the IPoIB qkey, etc. > > Or. > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
