Chuck Lever bade4be69a svcrdma: Revert "svcrdma: Reduce Receive doorbell rate" ...

I tested commit 43042b90cae1 ("svcrdma: Reduce Receive doorbell
rate") with mlx4 (IB) and software iWARP and didn't find any
issues. However, I recently got my hardware iWARP setup back on
line (FastLinQ) and it's crashing hard on this commit (confirmed
via bisect).

The failure mode is complex.
 - After a connection is established, the first Receive completes
   normally.
 - But the second and third Receives have garbage in their Receive
   buffers. The server responds with ERR_VERS as a result.
 - When the client tears down the connection to retry, a couple
   of posted Receives flush twice, and that corrupts the recv_ctxt
   free list.
 - __svc_rdma_free then faults or loops infinitely while destroying
   the xprt's recv_ctxts.

Since 43042b90cae1 ("svcrdma: Reduce Receive doorbell rate") does
not fix a bug but is a scalability enhancement, it's safe and
appropriate to revert it while working on a replacement.

Fixes: 43042b90cae1 ("svcrdma: Reduce Receive doorbell rate")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

2021-03-11 15:26:07 -05:00

..

backchannel.c

rpcrdma: Fix comments about reverse-direction operation

2021-02-05 11:16:56 -05:00

frwr_ops.c

xprtrdma: Refactor invocations of offset_in_page()

2021-02-05 11:16:56 -05:00

Makefile

svcrdma: Add a "parsed chunk list" data structure

2020-11-30 13:00:22 -05:00

module.c

SUNRPC: xprt_load_transport() needs to support the netid "rdma6"

2020-12-02 14:05:52 -05:00

rpc_rdma.c

xprtrdma: Clean up rpcrdma_prepare_readch()

2021-02-05 15:54:03 -05:00

svc_rdma_backchannel.c

svcrdma: disable timeouts on rdma backchannel

2021-03-06 16:41:48 -05:00

svc_rdma_pcl.c

svcrdma: Add a "parsed chunk list" data structure

2020-11-30 13:00:22 -05:00

svc_rdma_recvfrom.c

svcrdma: Revert "svcrdma: Reduce Receive doorbell rate"

2021-03-11 15:26:07 -05:00

svc_rdma_rw.c

svcrdma: Restore read and write stats

2021-01-25 09:36:28 -05:00

svc_rdma_sendto.c

svcrdma: Convert rdma_stat_sq_starve to a per-CPU counter

2021-01-25 09:36:28 -05:00

svc_rdma_transport.c

svcrdma: Hold private mutex while invoking rdma_accept()

2021-02-15 10:45:00 -05:00

svc_rdma.c

svcrdma: Deprecate stat variables that are no longer used

2021-01-25 09:36:28 -05:00

transport.c

NFSoRDmA Client updates for Linux 5.11

2020-12-15 20:08:41 -05:00

verbs.c

xprtrdma: Move rpcrdma_mr_put()

2020-11-11 10:52:18 -05:00

xprt_rdma.h

rpcrdma: Fix comments about reverse-direction operation

2021-02-05 11:16:56 -05:00