RFC svcrdma: Fast Memory Registration Support

This patchset implements support for Fast Memory Registration in the NFS server. Fast Memory Regstration is the ability to quickly map a kernel memory page list as a logically contiguous memory region from the perspective of the adapter. This mapping is created and invalidated using work requests posted on the SQ. This allows for large amounts of data to transferred between the client and server with a single work request as well as the ability to invalidate a previously mapped memory region. For iWARP, this allows for "one-shot" memory regions to be mapped for a single NFS-RDMA data transfer. This improves security since a byzantine app listening on the net will have a very short window during which the RKEY is valid.

This capability is only enabled if the underlying device advertises that it is supported.

This patches are also available here:
git://git.linux-nfs.org/projects/tomtucker/xprt-switch-2.6.git

include/linux/sunrpc/svc_rdma.h | 27 ++++++++++++++++++++++++++-

1 files changed, 26 insertions(+), 1 deletions(-)

[PATCH 02/09] svcrdma: Add FRMR get/put services

include/linux/sunrpc/svc_rdma.h | 3 +
net/sunrpc/xprtrdma/svc_rdma_transport.c | 125 ++++++++++++++++++++++++++++-

2 files changed, 123 insertions(+), 5 deletions(-)

[PATCH 03/09] svcrdma: Query device for Fast Reg support during connection setup

net/sunrpc/xprtrdma/svc_rdma_transport.c | 86 +++++++++++++++++++++++++++--

1 files changed, 80 insertions(+), 6 deletions(-)

[PATCH 04/09] svcrdma: Add a service to register a Fast Reg MR with the device

include/linux/sunrpc/svc_rdma.h | 1 +
net/sunrpc/xprtrdma/svc_rdma_transport.c | 53 ++++++++++++++++++++++++++---

2 files changed, 48 insertions(+), 6 deletions(-)

[PATCH 05/09] svcrdma: Modify post recv path to use local dma key

net/sunrpc/xprtrdma/svc_rdma_transport.c | 10 +++++++---

1 files changed, 7 insertions(+), 3 deletions(-)

[PATCH 06/09] svcrdma: Add support to svc_rdma_send to handle chained WR

net/sunrpc/xprtrdma/svc_rdma_transport.c | 29 +++++++++++++++++++++--------

1 files changed, 21 insertions(+), 8 deletions(-)

[PATCH 07/09] svcrdma: Modify the RPC recv path to use FRMR when available

include/linux/sunrpc/svc_rdma.h          |    1 +
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c  |  187 ++++++++++++++++++++++++++----
net/sunrpc/xprtrdma/svc_rdma_transport.c |    5 +-
3 files changed, 171 insertions(+), 22 deletions(-)

[PATCH 08/09] svcrdma: Modify the RPC reply path to use FRMR when available

net/sunrpc/xprtrdma/svc_rdma_sendto.c | 263 +++++++++++++++++++++++++-----
net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 +

2 files changed, 225 insertions(+), 40 deletions(-)

[PATCH 09/09] svcrdma: Update svc_rdma_send_error to use DMA LKEY

net/sunrpc/xprtrdma/svc_rdma_transport.c | 11 +++++++++--

1 files changed, 9 insertions(+), 2 deletions(-)