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android_kernel_motorola_sm6225/net/sunrpc/xprtrdma
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Chuck Lever 80b25628ff svcrdma: Ignore source port when computing DRC hash 
commit 1e091c3bbf51d34d5d96337a59ce5ab2ac3ba2cc upstream.

The DRC appears to be effectively empty after an RPC/RDMA transport
reconnect. The problem is that each connection uses a different
source port, which defeats the DRC hash.

Clients always have to disconnect before they send retransmissions
to reset the connection's credit accounting, thus every retransmit
on NFS/RDMA will miss the DRC.

An NFS/RDMA client's IP source port is meaningless for RDMA
transports. The transport layer typically sets the source port value
on the connection to a random ephemeral port. The server already
ignores it for the "secure port" check. See commit 16e4d93f6d
("NFSD: Ignore client's source port on RDMA transports").

The Linux NFS server's DRC resolves XID collisions from the same
source IP address by using the checksum of the first 200 bytes of
the RPC call header.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-10 09:53:47 +02:00
..
backchannel.c NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00
fmr_ops.c net/xprtrdma: Simplify ib_post_(send|recv|srq_recv)() calls 2018-07-24 16:06:37 -06:00
frwr_ops.c RDMA, core and ULPs: Declare ib_post_send() and ib_post_recv() arguments const 2018-07-30 20:09:34 -06:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.c NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00
rpc_rdma.c NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00
svc_rdma.c sunrpc: remove redundant variables 'checksumlen','blocksize' and 'data' 2018-08-09 16:11:21 -04:00
svc_rdma_backchannel.c xprtrdma: Reset credit grant properly after a disconnect 2018-11-13 11:08:34 -08:00
svc_rdma_recvfrom.c A mistake on my part caused me to tag my branch 6 commits too early, 2018-08-23 16:00:10 -07:00
svc_rdma_rw.c A mistake on my part caused me to tag my branch 6 commits too early, 2018-08-23 16:00:10 -07:00
svc_rdma_sendto.c svcrdma: Remove max_sge check at connect time 2019-02-15 08:10:13 +01:00
svc_rdma_transport.c svcrdma: Ignore source port when computing DRC hash 2019-07-10 09:53:47 +02:00
transport.c xprtrdma: Reset credit grant properly after a disconnect 2018-11-13 11:08:34 -08:00
verbs.c xprtrdma: Make sure Send CQ is allocated on an existing compvec 2019-03-23 20:09:45 +01:00
xprt_rdma.h NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00