The following patch series makes these changes: - Support for devices that support SG_GAP - Several bug fixes - A number of clean-ups and optimizations SG_GAP devices allow the client transport implementation to register non-contiguous memory regions using one offset and handle. Scatter and gather from these regions are then managed entirely in hardware. Normally a Reply chunk for a READDIR or GETACL is built of multiple RDMA segments. Now, when our client wants to build a Reply chunk out of the xdr_buf's head, page list, and tail, it appears to the server as a single contiguous RDMA segment if the device supports SG_GAP. Instead of a separate Write WR for each of several RDMA segments, the server can then post a single Write WR to transmit the whole RPC Reply (assuming the Reply is smaller than the server RNIC's max_sge) and can invalidate the whole Reply chunk remotely. SG_GAP is currently supported by mlx5 devices when using the FRWR registration mechanism. Available in the "nfs-rdma-for-4.10" topic branch of this git repo: git://git.linux-nfs.org/projects/cel/cel-2.6.git Or for browsing: http://git.linux-nfs.org/?p=cel/cel-2.6.git;a=log;h=refs/heads/nfs-rdma-for-4.10 --- Chuck Lever (14): xprtrdma: Fix DMAR failure in frwr_op_map() after reconnect xprtrdma: Cap size of callback buffer resources xprtrdma: Make FRWR send queue entry accounting more accurate xprtrdma: Support for SG_GAP devices SUNRPC: Proper metric accounting when RPC is not transmitted xprtrdma: Address coverity complaint about wait_for_completion() xprtrdma: Avoid calls to ro_unmap_safe() xprtrdma: Squelch "max send, max recv" messages at connect time xprtrdma: Shorten QP access error message xprtrdma: Update dprintk in rpcrdma_count_chunks xprtrdma: Relocate connection helper functions xprtrdma: Simplify synopsis of rpcrdma_ep_connect() xprtrdma: Refactor FRMR invalidation xprtrdma: Update documenting comment net/sunrpc/stats.c | 10 ++- net/sunrpc/xprtrdma/backchannel.c | 4 + net/sunrpc/xprtrdma/frwr_ops.c | 131 +++++++++++++++++++------------------ net/sunrpc/xprtrdma/rpc_rdma.c | 36 ---------- net/sunrpc/xprtrdma/transport.c | 36 +++++++++- net/sunrpc/xprtrdma/verbs.c | 54 ++++++++------- net/sunrpc/xprtrdma/xprt_rdma.h | 36 +++++++--- 7 files changed, 161 insertions(+), 146 deletions(-) -- Chuck Lever -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
