From: Chuck Lever <chuck.lever@oracle.com>
To: bfields@fieldses.org
Cc: linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: [PATCH RFC 0/6] NFSD: Pull Read chunks in XDR decoders
Date: Tue, 31 Aug 2021 15:05:09 -0400 [thread overview]
Message-ID: <163043485613.1415.4979286233971984855.stgit@klimt.1015granger.net> (raw)
Hi Bruce-
Here is part of what we discussed recently about trying to align
pages in NFS WRITE requests so that splice can be used. This
series updates server-side RPC and svcrdma to ensure that an
aligned xdr_buf::pages array is presented to NFSD, which is then
converted into an aligned rq_vec for the VFS layer.
The next step would be to look at how to make the best use of the
aligned rq_vec. My naive thought is that where there is a PAGE_SIZE
entry in rq_vec and there is no page in the file's page cache at
that offset, the transport-provided page can be flipped into place.
Might work for replacing whole pages as well, but baby steps first.
This series has been exercised a bit with both TCP and RDMA, but no
guarantees that it is completely bug-free. NFSv4 compounds with
multiple WRITE payloads on RDMA are treated like TCP: the RPC
message is contained in an unstructured stream of unaligned pages.
Comments encouraged.
---
Chuck Lever (6):
SUNRPC: Capture value of xdr_buf::page_base
SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases
NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment()
SUNRPC: svc_fill_write_vector() must handle non-zero page_bases
NFSD: Add a transport hook for pulling argument payloads
svcrdma: Pull Read chunks in ->xpo_argument_payload
fs/nfsd/nfs3proc.c | 3 +-
fs/nfsd/nfs3xdr.c | 16 +--
fs/nfsd/nfs4proc.c | 3 +-
fs/nfsd/nfs4xdr.c | 6 +
fs/nfsd/nfsproc.c | 3 +-
fs/nfsd/nfsxdr.c | 13 +--
fs/nfsd/xdr.h | 2 +-
fs/nfsd/xdr3.h | 2 +-
include/linux/sunrpc/svc.h | 6 +-
include/linux/sunrpc/svc_rdma.h | 8 ++
include/linux/sunrpc/svc_xprt.h | 3 +
include/trace/events/rpcrdma.h | 26 +++++
include/trace/events/sunrpc.h | 20 +++-
net/sunrpc/svc.c | 38 +++++--
net/sunrpc/svcsock.c | 8 ++
net/sunrpc/xdr.c | 32 +++---
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 37 +++++-
net/sunrpc/xprtrdma/svc_rdma_rw.c | 139 ++++++++++++++++++++---
net/sunrpc/xprtrdma/svc_rdma_transport.c | 1 +
19 files changed, 292 insertions(+), 74 deletions(-)
--
Chuck Lever
next reply other threads:[~2021-08-31 19:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 19:05 Chuck Lever [this message]
2021-08-31 19:05 ` [PATCH RFC 1/6] SUNRPC: Capture value of xdr_buf::page_base Chuck Lever
2021-08-31 19:05 ` [PATCH RFC 2/6] SUNRPC: xdr_stream_subsegment() must handle non-zero page_bases Chuck Lever
2021-08-31 19:05 ` [PATCH RFC 3/6] NFSD: Have legacy NFSD WRITE decoders use xdr_stream_subsegment() Chuck Lever
2021-08-31 19:05 ` [PATCH RFC 4/6] SUNRPC: svc_fill_write_vector() must handle non-zero page_bases Chuck Lever
2021-08-31 19:05 ` [PATCH RFC 5/6] NFSD: Add a transport hook for pulling argument payloads Chuck Lever
2021-08-31 19:05 ` [PATCH RFC 6/6] svcrdma: Pull Read chunks in ->xpo_argument_payload Chuck Lever
2021-08-31 19:08 ` Chuck Lever III
2021-08-31 20:40 ` J. Bruce Fields
2021-08-31 21:19 ` Chuck Lever III
2021-08-31 21:24 ` Bruce Fields
2021-08-31 20:42 ` [PATCH RFC 0/6] NFSD: Pull Read chunks in XDR decoders J. Bruce Fields
2021-08-31 21:23 ` Chuck Lever III
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