This series implements support for multiple RPC/RDMA chunks per RPC
transaction. This is one of the few remaining generalities that the
Linux NFS/RDMA server implementation lacks.
There is currently one known NFS/RDMA client implementation that can
send multiple chunks per RPC, and that is Solaris. Multiple chunks
are rare enough that the Linux NFS/RDMA implementation has been
successful without this support for many years.
Along with multiple chunk support, this series adds the following
benefits:
- More robust input sanitization of RPC/RDMA headers
- An internal representation of chunks that is agnostic to their
wire format
The cost is a little additional complexity and some extra memory
allocations when handling non-empty chunk lists. Most of these
allocations can be optimized away if we find they are a problem.
---
Chuck Lever (20):
SUNRPC: Adjust synopsis of xdr_buf_subsegment()
svcrdma: Const-ify the xdr_buf arguments
svcrdma: Refactor the RDMA Write path
SUNRPC: Rename svc_encode_read_payload()
NFSD: Invoke svc_encode_result_payload() in "read" NFSD encoders
svcrdma: Post RDMA Writes while XDR encoding replies
svcrdma: Clean up svc_rdma_encode_reply_chunk()
svcrdma: Add a "parsed chunk list" data structure
svcrdma: Use parsed chunk lists to derive the inv_rkey
svcrdma: Use parsed chunk lists to detect reverse direction replies
svcrdma: Use parsed chunk lists to construct RDMA Writes
svcrdma: Use parsed chunk lists to encode Reply transport headers
svcrdma: Support multiple write chunks when pulling up
svcrdma: Support multiple Write chunks in svc_rdma_map_reply_msg()
svcrdma: Support multiple Write chunks in svc_rdma_send_reply_chunk
svcrdma: Remove chunk list pointers
svcrdma: Clean up chunk tracepoints
svcrdma: Rename info::ri_chunklen
svcrdma: Use the new parsed chunk list when pulling Read chunks
svcrdma: support multiple Read chunks per RPC
fs/nfsd/nfs3xdr.c | 4 +
fs/nfsd/nfs4xdr.c | 5 +-
fs/nfsd/nfsxdr.c | 4 +
include/linux/sunrpc/svc.h | 6 +-
include/linux/sunrpc/svc_rdma.h | 36 +-
include/linux/sunrpc/svc_rdma_pcl.h | 128 +++++
include/linux/sunrpc/svc_xprt.h | 4 +-
include/trace/events/rpcrdma.h | 143 +++--
net/sunrpc/svc.c | 11 +-
net/sunrpc/svcsock.c | 8 +-
net/sunrpc/xprtrdma/Makefile | 2 +-
net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 14 +-
net/sunrpc/xprtrdma/svc_rdma_pcl.c | 306 +++++++++++
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 314 ++++++-----
net/sunrpc/xprtrdma/svc_rdma_rw.c | 598 +++++++++++++++------
net/sunrpc/xprtrdma/svc_rdma_sendto.c | 561 ++++++++++---------
net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 +-
17 files changed, 1488 insertions(+), 658 deletions(-)
create mode 100644 include/linux/sunrpc/svc_rdma_pcl.h
create mode 100644 net/sunrpc/xprtrdma/svc_rdma_pcl.c
--
Chuck Lever
