> -----Original Message----- > From: Chuck Lever [mailto:chuck.lever@xxxxxxxxxx] > Sent: Wednesday, July 02, 2014 2:40 PM > To: Steve Wise; Devesh Sharma > Cc: linux-rdma@xxxxxxxxxxxxxxx; Linux NFS Mailing List > Subject: Re: [PATCH v1 05/13] xprtrdma: Don't drain CQs on transport disconnect > > > On Jul 2, 2014, at 3:28 PM, Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx> wrote: > > > On 7/2/2014 2:06 PM, Devesh Sharma wrote: > >> This change is very much prone to generate poll_cq errors because of un-cleaned > completions which still > >> point to the non-existent QPs. On the new connection when these completions are polled, > the poll_cq will > >> fail because old QP pointer is already NULL. > >> Did anyone hit this situation during their testing? > > I tested this aggressively with a fault injector that triggers regular connection > disruption. > > > Hey Devesh, > > > > iw_cxgb4 will silently toss CQEs if the QP is not active. > > xprtrdma relies on getting a completion (either successful or in error) for every > WR it has posted. The goal of this patch is to avoid throwing away queued > completions after a transport disconnect so we don't lose track of FRMR rkey > updates (FAST_REG_MR and LOCAL_INV completions) and we can capture all RPC > replies posted before the connection was lost. > > Sounds like we also need to keep the QP around, even in error state, until all > known WRs on that QP have completed? > Perhaps. > > > > > > >>> -----Original Message----- > >>> From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma- > >>> owner@xxxxxxxxxxxxxxx] On Behalf Of Chuck Lever > >>> Sent: Tuesday, June 24, 2014 4:10 AM > >>> To: linux-rdma@xxxxxxxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx > >>> Subject: [PATCH v1 05/13] xprtrdma: Don't drain CQs on transport disconnect > >>> > >>> CQs are not destroyed until unmount. By draining CQs on transport > >>> disconnect, successful completions that can change the r.frmr.state field can > >>> be missed. > >>> > >>> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx> > >>> --- > >>> net/sunrpc/xprtrdma/verbs.c | 5 ----- > >>> 1 file changed, 5 deletions(-) > >>> > >>> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c > >>> index 3c7f904..451e100 100644 > >>> --- a/net/sunrpc/xprtrdma/verbs.c > >>> +++ b/net/sunrpc/xprtrdma/verbs.c > >>> @@ -873,9 +873,6 @@ retry: > >>> dprintk("RPC: %s: rpcrdma_ep_disconnect" > >>> " status %i\n", __func__, rc); > >>> > >>> - rpcrdma_clean_cq(ep->rep_attr.recv_cq); > >>> - rpcrdma_clean_cq(ep->rep_attr.send_cq); > >>> - > >>> xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); > >>> id = rpcrdma_create_id(xprt, ia, > >>> (struct sockaddr *)&xprt->rx_data.addr); > >>> @@ -985,8 +982,6 @@ rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, > >>> struct rpcrdma_ia *ia) { > >>> int rc; > >>> > >>> - rpcrdma_clean_cq(ep->rep_attr.recv_cq); > >>> - rpcrdma_clean_cq(ep->rep_attr.send_cq); > >>> rc = rdma_disconnect(ia->ri_id); > >>> if (!rc) { > >>> /* returns without wait if not connected */ > >>> > >>> -- > >>> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the > >>> body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > >>> http://vger.kernel.org/majordomo-info.html > >> N�����r��y���b�X��ǧv�^�){.n�+����{���"��^n�r���z���h����&�� �G���h�(�階 > �ݢj"���m�����z�ޖ���f���h���~�mml== > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > Chuck Lever > chuck[dot]lever[at]oracle[dot]com > > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
