talos-obmc-linux/include/linux/sunrpc/xprt.h, branch v4.6

SUNRPC: Add a structure to track multiple transports

2016-02-05T23:48:54+00:00

In order to support multipathing/trunking we will need the ability to track multiple transports. This patch sets up a basic structure for doing so. Signed-off-by: Trond Myklebust

SUNRPC: Make freeing of struct xprt rcu-safe

2016-02-01T02:37:23+00:00

Have it call kfree_rcu() to ensure that we can use it on rcu-protected lists. Signed-off-by: Trond Myklebust

SUNRPC: Uninline xprt_get(); It isn't performance critical.

2016-02-01T02:37:22+00:00

Also allow callers to pass NULL arguments to xprt_get() and xprt_put(). Signed-off-by: Trond Myklebust

NFS: Enable client side NFSv4.1 backchannel to use other transports

2015-11-02T21:29:13+00:00

Forechannel transports get their own "bc_up" method to create an endpoint for the backchannel service. Signed-off-by: Chuck Lever [Anna Schumaker: Add forward declaration of struct net to xprt.h] Signed-off-by: Anna Schumaker

svcrdma: Add backward direction service for RPC/RDMA transport

2015-11-02T18:45:15+00:00

On NFSv4.1 mount points, the Linux NFS client uses this transport endpoint to receive backward direction calls and route replies back to the NFSv4.1 server. Signed-off-by: Chuck Lever Acked-by: "J. Bruce Fields" Reviewed-by: Sagi Grimberg Tested-By: Devesh Sharma Signed-off-by: Anna Schumaker

SUNRPC: Abstract backchannel operations

2015-11-02T18:45:15+00:00

xprt_{setup,destroy}_backchannel() won't be adequate for RPC/RMDA bi-direction. In particular, receive buffers have to be pre- registered and posted in order to receive incoming backchannel requests. Add a virtual function call to allow the insertion of appropriate backchannel setup and destruction methods for each transport. In addition, freeing a backchannel request is a little different for RPC/RDMA. Introduce an rpc_xprt_op to handle the difference. Signed-off-by: Chuck Lever Reviewed-by: Sagi Grimberg Tested-By: Devesh Sharma Signed-off-by: Anna Schumaker

SUNRPC: Transport fault injection

2015-06-10T22:37:26+00:00

It has been exceptionally useful to exercise the logic that handles local immediate errors and RDMA connection loss. To enable developers to test this regularly and repeatably, add logic to simulate connection loss every so often. Fault injection is disabled by default. It is enabled with $ sudo echo xxx > /sys/kernel/debug/sunrpc/inject_fault/disconnect where "xxx" is a large positive number of transport method calls before a disconnect. A value of several thousand is usually a good number that allows reasonable forward progress while still causing a lot of connection drops. These hooks are disabled when SUNRPC_DEBUG is turned off. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust

sunrpc: turn swapper_enable/disable functions into rpc_xprt_ops

2015-06-10T22:26:26+00:00

RDMA xprts don't have a sock_xprt, but an rdma_xprt, so the xs_swapper_enable/disable functions will likely oops when fed an RDMA xprt. Turn these functions into rpc_xprt_ops so that that doesn't occur. For now the RDMA versions are no-ops that just return -EINVAL on an attempt to swapon. Cc: Chuck Lever Signed-off-by: Jeff Layton Reviewed-by: Chuck Lever Signed-off-by: Trond Myklebust

sunrpc: make xprt->swapper an atomic_t

2015-06-10T22:26:18+00:00

Split xs_swapper into enable/disable functions and eliminate the "enable" flag. Currently, it's racy if you have multiple swapon/swapoff operations running in parallel over the same xprt. Also fix it so that we only set it to a memalloc socket on a 0->1 transition and only clear it on a 1->0 transition. Cc: Mel Gorman Signed-off-by: Jeff Layton Reviewed-by: Chuck Lever Signed-off-by: Trond Myklebust

SUNRPC: Fix a backchannel race

2015-06-05T15:15:43+00:00

We need to allow the server to send a new request immediately after we've replied to the previous one. Right now, there is a window between the send and the release of the old request in rpc_put_task(), where the server could send us a new backchannel RPC call, and we have no request to service it. Signed-off-by: Trond Myklebust