Commit Graph

694 Commits

Author SHA1 Message Date
Chuck Lever
f4a2805e7d xprtrdma: Remove rpclen from rpcrdma_marshal_req
Clean up: Remove a variable whose result is no longer used.
Commit 655fec6987 ("xprtrdma: Use gathered Send for large inline
messages") should have removed it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-11 13:20:08 -04:00
Chuck Lever
09e60641fc xprtrdma: Clean up rpcrdma_marshal_req() synopsis
Clean up: The caller already has rpcrdma_xprt, so pass that directly
instead. And provide a documenting comment for this critical
function.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-11 13:20:08 -04:00
Chuck Lever
c1bcb68e39 xprtrdma: Clean up XDR decoding in rpcrdma_update_granted_credits()
Clean up: Replace C-structure based XDR decoding for consistency
with other areas.

struct rpcrdma_rep is rearranged slightly so that the relevant fields
are in cache when the Receive completion handler is invoked.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:01 -04:00
Chuck Lever
e2a6719041 xprtrdma: Remove rpcrdma_rep::rr_len
This field is no longer used outside the Receive completion handler.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:01 -04:00
Chuck Lever
fdf503e302 xprtrdma: Remove opcode check in Receive completion handler
Clean up: The opcode check is no longer necessary, because since
commit 2fa8f88d88 ("xprtrdma: Use new CQ API for RPC-over-RDMA
client send CQs"), this completion handler is invoked only for
RECV work requests.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:00 -04:00
Chuck Lever
264b0cdbcb xprtrdma: Replace rpcrdma_count_chunks()
Clean up chunk list decoding by using the xdr_stream set up in
rpcrdma_reply_handler. This hardens decoding by checking for buffer
overflow at every step while unmarshaling variable-length XDR
objects.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:00 -04:00
Chuck Lever
07ff2dd510 xprtrdma: Refactor rpcrdma_reply_handler()
Refactor the reply handler's transport header decoding logic to make
it easier to understand and update.

Convert some of the handler to use xdr_streams, which will enable
stricter validation of input data and enable the eventual addition
of support for new combinations of chunks, such as "Write + Reply"
or "PZRC + normal Read".

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:00 -04:00
Chuck Lever
41c8f70f5a xprtrdma: Harden backchannel call decoding
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:00 -04:00
Chuck Lever
96f8778f70 xprtrdma: Add xdr_init_decode to rpcrdma_reply_handler()
Transport header decoding deals with untrusted input data, therefore
decoding this header needs to be hardened.

Adopt the same infrastructure that is used when XDR decoding NFS
replies. This is slightly more CPU-intensive than the replaced code,
but we're not adding new atomics, locking, or context switches. The
cost is manageable.

Start by initializing an xdr_stream in rpcrdma_reply_handler().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-08 10:52:00 -04:00
Chuck Lever
d31ae25481 sunrpc: Const-ify all instances of struct rpc_xprt_ops
After transport instance creation, these function pointers never
change. Mark them as constant to prevent their use as an attack
vector for code injections.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-08-01 16:10:35 -04:00
Linus Torvalds
b86faee6d1 NFS client updates for Linux 4.13
Stable bugfixes:
 - Fix -EACCESS on commit to DS handling
 - Fix initialization of nfs_page_array->npages
 - Only invalidate dentries that are actually invalid
 
 Features:
 - Enable NFSoRDMA transparent state migration
 - Add support for lookup-by-filehandle
 - Add support for nfs re-exporting
 
 Other bugfixes and cleanups:
 - Christoph cleaned up the way we declare NFS operations
 - Clean up various internal structures
 - Various cleanups to commits
 - Various improvements to error handling
 - Set the dt_type of . and .. entries in NFS v4
 - Make slot allocation more reliable
 - Fix fscache stat printing
 - Fix uninitialized variable warnings
 - Fix potential list overrun in nfs_atomic_open()
 - Fix a race in NFSoRDMA RPC reply handler
 - Fix return size for nfs42_proc_copy()
 - Fix against MAC forgery timing attacks
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEnZ5MQTpR7cLU7KEp18tUv7ClQOsFAlln4jEACgkQ18tUv7Cl
 QOv2ZxAAwbQN9Dtx4rOZmPe0Xszua23sNN0ja891PodkCjIiZrRelZhLIBAf1rfP
 uSR+jTD8EsBHGt3bzTXg2DHz+o8cGDZuH+uuZX+wRWJPQcKA2pC7zElqnse8nmn5
 4Z1UUdzf42vE4NZ/G1ucqpEiAmOqGJ3s7pCRLLXPvOSSQXqOhiomNDAcGxX05FIv
 Ly4Kr6RIfg/O4oNOZBuuL/tZHodeyOj1vbyjt/4bDQ5MEXlUQfcjJZEsz/2EcNh6
 rAgbquxr1pGCD072pPBwYNH2vLGbgNN41KDDMGI0clp+8p6EhV6BOlgcEoGtZM86
 c0yro2oBOB2vPCv9nGr6JgTOHPKG6ksJ7vWVXrtQEjBGP82AbFfAawLgqZ6Ae8dP
 Sqpx55j4xdm4nyNglCuhq5PlPAogARq/eibR+RbY973Lhzr5bZb3XqlairCkNNEv
 4RbTlxbWjhgrKJ56jVf+KpUDJAVG5viKMD7YDx/bOfLtvPwALbozD7ONrunz5v43
 PgQEvWvVtnQAKp27pqHemTsLFhU6M6eGUEctRnAfB/0ogWZh1X8QXgulpDlqG3kb
 g12kr5hfA0pSfcB0aGXVzJNnHKfW3IY3WBWtxq4xaMY22YkHtuB+78+9/yk3jCAi
 dvimjT2Ko9fE9MnltJ/hC5BU+T+xUxg+1vfwWnKMvMH8SIqjyu4=
 =OpLj
 -----END PGP SIGNATURE-----

Merge tag 'nfs-for-4.13-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client updates from Anna Schumaker:
 "Stable bugfixes:
   - Fix -EACCESS on commit to DS handling
   - Fix initialization of nfs_page_array->npages
   - Only invalidate dentries that are actually invalid

  Features:
   - Enable NFSoRDMA transparent state migration
   - Add support for lookup-by-filehandle
   - Add support for nfs re-exporting

  Other bugfixes and cleanups:
   - Christoph cleaned up the way we declare NFS operations
   - Clean up various internal structures
   - Various cleanups to commits
   - Various improvements to error handling
   - Set the dt_type of . and .. entries in NFS v4
   - Make slot allocation more reliable
   - Fix fscache stat printing
   - Fix uninitialized variable warnings
   - Fix potential list overrun in nfs_atomic_open()
   - Fix a race in NFSoRDMA RPC reply handler
   - Fix return size for nfs42_proc_copy()
   - Fix against MAC forgery timing attacks"

* tag 'nfs-for-4.13-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (68 commits)
  NFS: Don't run wake_up_bit() when nobody is waiting...
  nfs: add export operations
  nfs4: add NFSv4 LOOKUPP handlers
  nfs: add a nfs_ilookup helper
  nfs: replace d_add with d_splice_alias in atomic_open
  sunrpc: use constant time memory comparison for mac
  NFSv4.2 fix size storage for nfs42_proc_copy
  xprtrdma: Fix documenting comments in frwr_ops.c
  xprtrdma: Replace PAGE_MASK with offset_in_page()
  xprtrdma: FMR does not need list_del_init()
  xprtrdma: Demote "connect" log messages
  NFSv4.1: Use seqid returned by EXCHANGE_ID after state migration
  NFSv4.1: Handle EXCHGID4_FLAG_CONFIRMED_R during NFSv4.1 migration
  xprtrdma: Don't defer MR recovery if ro_map fails
  xprtrdma: Fix FRWR invalidation error recovery
  xprtrdma: Fix client lock-up after application signal fires
  xprtrdma: Rename rpcrdma_req::rl_free
  xprtrdma: Pass only the list of registered MRs to ro_unmap_sync
  xprtrdma: Pre-mark remotely invalidated MRs
  xprtrdma: On invalidation failure, remove MWs from rl_registered
  ...
2017-07-13 14:35:37 -07:00
Chuck Lever
6afafa7799 xprtrdma: Fix documenting comments in frwr_ops.c
Clean up.

FASTREG and LOCAL_INV WRs are typically not signaled. localinv_wake
is used for the last LOCAL_INV WR in a chain, which is always
signaled. The documenting comments should reflect that.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:13 -04:00
Chuck Lever
d933cc3201 xprtrdma: Replace PAGE_MASK with offset_in_page()
Clean up.

Reported by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:13 -04:00
Chuck Lever
e2f6ef0915 xprtrdma: FMR does not need list_del_init()
Clean up.

Commit 38f1932e60 ("xprtrdma: Remove FMRs from the unmap list
after unmapping") utilized list_del_init() to try to prevent some
list corruption. The corruption was actually caused by the reply
handler racing with a signal. Now that MR invalidation is properly
serialized, list_del_init() can safely be replaced.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:13 -04:00
Chuck Lever
173b8f49b3 xprtrdma: Demote "connect" log messages
Some have complained about the log messages generated when xprtrdma
opens or closes a connection to a server. When an NFS mount is
mostly idle these can appear every few minutes as the client idles
out the connection and reconnects.

Connection and disconnection is a normal part of operation, and not
exceptional, so change these to dprintk's for now. At some point
all of these will be converted to tracepoints, but that's for
another day.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:12 -04:00
Chuck Lever
1f541895da xprtrdma: Don't defer MR recovery if ro_map fails
Deferred MR recovery does a DMA-unmapping of the MW. However, ro_map
invokes rpcrdma_defer_mr_recovery in some error cases where the MW
has not even been DMA-mapped yet.

Avoid a DMA-unmapping error replacing rpcrdma_defer_mr_recovery.

Also note that if ib_dma_map_sg is asked to map 0 nents, it will
return 0. So the extra "if (i == 0)" check is no longer needed.

Fixes: 42fe28f607 ("xprtrdma: Do not leak an MW during a DMA ...")
Fixes: 505bbe64dd ("xprtrdma: Refactor MR recovery work queues")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:11 -04:00
Chuck Lever
8d75483a23 xprtrdma: Fix FRWR invalidation error recovery
When ib_post_send() fails, all LOCAL_INV WRs past @bad_wr have to be
examined, and the MRs reset by hand.

I'm not sure how the existing code can work by comparing R_keys.
Restructure the logic so that instead it walks the chain of WRs,
starting from the first bad one.

Make sure to wait for completion if at least one WR was actually
posted. Otherwise, if the ib_post_send fails, we can end up
DMA-unmapping the MR while LOCAL_INV operations are in flight.

Commit 7a89f9c626 ("xprtrdma: Honor ->send_request API contract")
added the rdma_disconnect() call site. The disconnect actually
causes more problems than it solves, and SQ overruns happen only as
a result of software bugs. So remove it.

Fixes: d7a21c1bed ("xprtrdma: Reset MRs in frwr_op_unmap_sync()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:11 -04:00
Chuck Lever
431af645cf xprtrdma: Fix client lock-up after application signal fires
After a signal, the RPC client aborts synchronous RPCs running on
behalf of the signaled application.

The server is still executing those RPCs, and will write the results
back into the client's memory when it's done. By the time the server
writes the results, that memory is likely being used for other
purposes. Therefore xprtrdma has to immediately invalidate all
memory regions used by those aborted RPCs to prevent the server's
writes from clobbering that re-used memory.

With FMR memory registration, invalidation takes a relatively long
time. In fact, the invalidation is often still running when the
server tries to write the results into the memory regions that are
being invalidated.

This sets up a race between two processes:

1.  After the signal, xprt_rdma_free calls ro_unmap_safe.
2.  While ro_unmap_safe is still running, the server replies and
    rpcrdma_reply_handler runs, calling ro_unmap_sync.

Both processes invoke ib_unmap_fmr on the same FMR.

The mlx4 driver allows two ib_unmap_fmr calls on the same FMR at
the same time, but HCAs generally don't tolerate this. Sometimes
this can result in a system crash.

If the HCA happens to survive, rpcrdma_reply_handler continues. It
removes the rpc_rqst from rq_list and releases the transport_lock.
This enables xprt_rdma_free to run in another process, and the
rpc_rqst is released while rpcrdma_reply_handler is still waiting
for the ib_unmap_fmr call to finish.

But further down in rpcrdma_reply_handler, the transport_lock is
taken again, and "rqst" is dereferenced. If "rqst" has already been
released, this triggers a general protection fault. Since bottom-
halves are disabled, the system locks up.

Address both issues by reversing the order of the xprt_lookup_rqst
call and the ro_unmap_sync call. Introduce a separate lookup
mechanism for rpcrdma_req's to enable calling ro_unmap_sync before
xprt_lookup_rqst. Now the handler takes the transport_lock once
and holds it for the XID lookup and RPC completion.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:11 -04:00
Chuck Lever
a80d66c9e0 xprtrdma: Rename rpcrdma_req::rl_free
Clean up: I'm about to use the rl_free field for purposes other than
a free list. So use a more generic name.

This is a refactoring change only.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:10 -04:00
Chuck Lever
451d26e151 xprtrdma: Pass only the list of registered MRs to ro_unmap_sync
There are rare cases where an rpcrdma_req can be re-used (via
rpcrdma_buffer_put) while the RPC reply handler is still running.
This is due to a signal firing at just the wrong instant.

Since commit 9d6b040978 ("xprtrdma: Place registered MWs on a
per-req list"), rpcrdma_mws are self-contained; ie., they fully
describe an MR and scatterlist, and no part of that information is
stored in struct rpcrdma_req.

As part of closing the above race window, pass only the req's list
of registered MRs to ro_unmap_sync, rather than the rpcrdma_req
itself.

Some extra transport header sanity checking is removed. Since the
client depends on its own recollection of what memory had been
registered, there doesn't seem to be a way to abuse this change.

And, the check was not terribly effective. If the client had sent
Read chunks, the "list_empty" test is negative in both of the
removed cases, which are actually looking for Write or Reply
chunks.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:10 -04:00
Chuck Lever
4b196dc6fe xprtrdma: Pre-mark remotely invalidated MRs
There are rare cases where an rpcrdma_req and its matched
rpcrdma_rep can be re-used, via rpcrdma_buffer_put, while the RPC
reply handler is still using that req. This is typically due to a
signal firing at just the wrong instant.

As part of closing this race window, avoid using the wrong
rpcrdma_rep to detect remotely invalidated MRs. Mark MRs as
invalidated while we are sure the rep is still OK to use.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a7 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:10 -04:00
Chuck Lever
04d25b7d5d xprtrdma: On invalidation failure, remove MWs from rl_registered
Callers assume the ro_unmap_sync and ro_unmap_safe methods empty
the list of registered MRs. Ensure that all paths through
fmr_op_unmap_sync() remove MWs from that list.

Fixes: 9d6b040978 ("xprtrdma: Place registered MWs on a ... ")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-07-13 16:00:09 -04:00
Colin Ian King
b20dae70bf svcrdma: fix an incorrect check on -E2BIG and -EINVAL
The current check will always be true and will always jump to
err1, this looks dubious to me. I believe && should be used
instead of ||.

Detected by CoverityScan, CID#1450120 ("Logically Dead Code")

Fixes: 107c1d0a99 ("svcrdma: Avoid Send Queue overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-13 14:18:47 -04:00
Chuck Lever
35a30fc389 svcrdma: Remove svc_rdma_chunk_ctxt::cc_dir field
Clean up: No need to save the I/O direction. The functions that
release svc_rdma_chunk_ctxt already know what direction to use.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:55:00 -04:00
Chuck Lever
91b022ec8b svcrdma: use offset_in_page() macro
Clean up: Use offset_in_page() macro instead of open-coding.

Reported-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:59 -04:00
Chuck Lever
9450ca8e2f svcrdma: Clean up after converting svc_rdma_recvfrom to rdma_rw API
Clean up: Registration mode details are now handled by the rdma_rw
API, and thus can be removed from svcrdma.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:59 -04:00
Chuck Lever
0d956e694a svcrdma: Clean-up svc_rdma_unmap_dma
There's no longer a need to compare each SGE's lkey with the PD's
local_dma_lkey. Now that FRWR is gone, all DMA mappings are for
pages that were registered with this key.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:58 -04:00
Chuck Lever
463e63d701 svcrdma: Remove frmr cache
Clean up: Now that the svc_rdma_recvfrom path uses the rdma_rw API,
the details of Read sink buffer registration are dealt with by the
kernel's RDMA core. This cache is no longer used, and can be
removed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:58 -04:00
Chuck Lever
c84dc900d7 svcrdma: Remove unused Read completion handlers
Clean up:

The generic RDMA R/W API conversion of svc_rdma_recvfrom replaced
the Register, Read, and Invalidate completion handlers. Remove the
old ones, which are no longer used.

These handlers shared some helper code with svc_rdma_wc_send. Fold
the wc_common helper back into the one remaining completion handler.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:57 -04:00
Chuck Lever
71641d99ce svcrdma: Properly compute .len and .buflen for received RPC Calls
When an RPC-over-RDMA request is received, the Receive buffer
contains a Transport Header possibly followed by an RPC message.

Even though rq_arg.head[0] (as passed to NFSD) does not contain the
Transport Header header, currently rq_arg.len includes the size of
the Transport Header.

That violates the intent of the xdr_buf API contract. .buflen should
include everything, but .len should be exactly the length of the RPC
message in the buffer.

The rq_arg fields are summed together at the end of
svc_rdma_recvfrom to obtain the correct return value. rq_arg.len
really ought to contain the correct number of bytes already, but it
currently doesn't due to the above misbehavior.

Let's instead ensure that .buflen includes the length of the
transport header, and that .len is always equal to head.iov_len +
.page_len + tail.iov_len .

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:57 -04:00
Chuck Lever
cafc739892 svcrdma: Use generic RDMA R/W API in RPC Call path
The current svcrdma recvfrom code path has a lot of detail about
registration mode and the type of port (iWARP, IB, etc).

Instead, use the RDMA core's generic R/W API. This shares code with
other RDMA-enabled ULPs that manages the gory details of buffer
registration and the posting of RDMA Read Work Requests.

Since the Read list marshaling code is being replaced, I took the
opportunity to replace C structure-based XDR encoding code with more
portable code that uses pointer arithmetic.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:56 -04:00
Chuck Lever
026d958b38 svcrdma: Add recvfrom helpers to svc_rdma_rw.c
svc_rdma_rw.c already contains helpers for the sendto path.
Introduce helpers for the recvfrom path.

The plan is to replace the local NFSD bespoke code that constructs
and posts RDMA Read Work Requests with calls to the rdma_rw API.
This shares code with other RDMA-enabled ULPs that manages the gory
details of buffer registration and posting Work Requests.

This new code also puts all RDMA_NOMSG-specific logic in one place.

Lastly, the use of rqstp->rq_arg.pages is deprecated in favor of
using rqstp->rq_pages directly, for clarity.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-07-12 15:54:56 -04:00
Chuck Lever
2d6491a56c svcrdma: Don't account for Receive queue "starvation"
>From what I can tell, calling ->recvfrom when there is no work to do
is a normal part of operation. This is the only way svc_recv can
tell when there is no more data ready to receive on the transport.

Neither the TCP nor the UDP transport implementations have a
"starve" metric.

The cost of receive starvation accounting is bumping an atomic, which
results in extra (IMO unnecessary) bus traffic between CPU sockets,
while holding a spin lock.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:44 -04:00
Chuck Lever
ca5c76aba7 svcrdma: Improve Reply chunk sanity checking
Identify malformed transport headers and unsupported chunk
combinations as early as possible.

- Ensure that segment lengths are not crazy.

- Ensure that the Reply chunk's segment count is not crazy.

With a 1KB inline threshold, the largest number of Write segments
that can be conveyed is about 60 (for a RDMA_NOMSG Reply message).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:44 -04:00
Chuck Lever
3c22f32607 svcrdma: Improve Write chunk sanity checking
Identify malformed transport headers and unsupported chunk
combinations as early as possible.

- Reject RPC-over-RDMA messages that contain more than one Write
chunk, since this implementation does not support more than one per
message.

- Ensure that segment lengths are not crazy.

- Ensure that the chunk's segment count is not crazy.

With a 1KB inline threshold, the largest number of Write segments
that can be conveyed is about 60 (for a RDMA_NOMSG Reply message).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:44 -04:00
Chuck Lever
e77340e003 svcrdma: Improve Read chunk sanity checking
Identify malformed transport headers and unsupported chunk
combinations as early as possible.

- Reject RPC-over-RDMA messages that contain more than one Read chunk,
  since this implementation currently does not support more than one
  per RPC transaction.

- Ensure that segment lengths are not crazy.

- Remove the segment count check. With a 1KB inline threshold, the
  largest number of Read segments that can be conveyed is about 40
  (for a RDMA_NOMSG Call message). This is nowhere near
  RPCSVC_MAXPAGES. As far as I can tell, that was just a sanity
  check and does not enforce an implementation limit.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:43 -04:00
Chuck Lever
a80a32341f svcrdma: Remove svc_rdma_marshal.c
svc_rdma_marshal.c has one remaining exported function --
svc_rdma_xdr_decode_req -- and it has a single call site. Take
the same approach as the sendto path, and move this function
into the source file where it is called.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:43 -04:00
Chuck Lever
107c1d0a99 svcrdma: Avoid Send Queue overflow
Sanity case: Catch the case where more Work Requests are being
posted to the Send Queue than there are Send Queue Entries.

This might happen if a client sends a chunk with more segments than
there are SQEs for the transport. The server can't send that reply,
so the transport will deadlock unless the client drops the RPC.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:43 -04:00
Chuck Lever
91a08eae79 svcrdma: Squelch disconnection messages
The server displays "svcrdma: failed to post Send WR (-107)" in the
kernel log when the client disconnects. This could flood the server's
log, so remove the message.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-06-28 14:21:43 -04:00
Markus Elfring
d2c23c0075 xprtrdma: Delete an error message for a failed memory allocation in xprt_rdma_bc_setup()
Omit an extra message for a memory allocation failure in this function.

This issue was detected by using the Coccinelle software.

Link: http://events.linuxfoundation.org/sites/events/files/slides/LCJ16-Refactor_Strings-WSang_0.pdf
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2017-05-24 07:53:37 -04:00
Linus Torvalds
c70422f760 Another RDMA update from Chuck Lever, and a bunch of miscellaneous
bugfixes.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJZE2UeAAoJECebzXlCjuG+St8P/0vG+ps9sY012E6Wh9gy4Ev4
 BtxG/c3CtcxrbNzW+cFhdEloBGtC0VvcrKNCozJTK4LdaPYErkyRBpjgXvIggT9I
 GWY4ftpH3eJ6uByN9Okgc3/1la2poDflJO/nYhdRed3YHOnXTtx/746tu1xAnVCV
 tFtDGrbJZTprt5c3zETtdtquCUSy2aMT5ZbrdU3yWBCwQMNSIufN3an8epfB++xx
 Ct+G0HTRffcWAdYuLT0N1HKqm8pkncdNMFpm7mVw0hMCRy552G3fuj8LtkhVTvKE
 1KN3zXY4jhaUYWD5Yt6AJcpLEro65b8swYk4e9FP2TNUpCmuRdXT9cb9vE8YztxC
 8s4N23RHaEx9I6pC3OU64a2HfhiQM/oOIvjlhTBsjojXsQcqZFD1vsoSYA8Byl0w
 m9EQWqPqge4m6yEYl7uAyL6xSthbrhcU1Ks5jvNXGcWzEQj7BATnynJANsfZ+y6r
 ZoVcsRNX49m1BG+p9br+9DFffPiNFUMqxbfr73L9HRep3OsPeFKazFG0bKd3hOqA
 E6L/AnBd9soSqTuTvbisWrGWbomhtd5G/fAa1uHrWTPHMXUWCmkguiau51FNfcHu
 xcJlBBVCvUmmd5u3wF6QeiyjPs4KEBzQzsOUsWKHRxDBp6s+5PX/lHuXRBlDP+fN
 TQq0KbvBtea1OyMaRtoV
 =Rtl/
 -----END PGP SIGNATURE-----

Merge tag 'nfsd-4.12' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "Another RDMA update from Chuck Lever, and a bunch of miscellaneous
  bugfixes"

* tag 'nfsd-4.12' of git://linux-nfs.org/~bfields/linux: (26 commits)
  nfsd: Fix up the "supattr_exclcreat" attributes
  nfsd: encoders mustn't use unitialized values in error cases
  nfsd: fix undefined behavior in nfsd4_layout_verify
  lockd: fix lockd shutdown race
  NFSv4: Fix callback server shutdown
  SUNRPC: Refactor svc_set_num_threads()
  NFSv4.x/callback: Create the callback service through svc_create_pooled
  lockd: remove redundant check on block
  svcrdma: Clean out old XDR encoders
  svcrdma: Remove the req_map cache
  svcrdma: Remove unused RDMA Write completion handler
  svcrdma: Reduce size of sge array in struct svc_rdma_op_ctxt
  svcrdma: Clean up RPC-over-RDMA backchannel reply processing
  svcrdma: Report Write/Reply chunk overruns
  svcrdma: Clean up RDMA_ERROR path
  svcrdma: Use rdma_rw API in RPC reply path
  svcrdma: Introduce local rdma_rw API helpers
  svcrdma: Clean up svc_rdma_get_inv_rkey()
  svcrdma: Add helper to save pages under I/O
  svcrdma: Eliminate RPCRDMA_SQ_DEPTH_MULT
  ...
2017-05-10 13:29:23 -07:00
Chuck Lever
dadf3e435d svcrdma: Clean out old XDR encoders
Clean up: These have been replaced and are no longer used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:56 -04:00
Chuck Lever
2cf32924c6 svcrdma: Remove the req_map cache
req_maps are no longer used by the send path and can thus be removed.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
68cc4636bb svcrdma: Remove unused RDMA Write completion handler
Clean up. All RDMA Write completions are now handled by
svc_rdma_wc_write_ctx.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
ded8d19641 svcrdma: Reduce size of sge array in struct svc_rdma_op_ctxt
The sge array in struct svc_rdma_op_ctxt is no longer used for
sending RDMA Write WRs. It need only accommodate the construction of
Send and Receive WRs. The maximum inline size is the largest payload
it needs to handle now.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
f5821c76b2 svcrdma: Clean up RPC-over-RDMA backchannel reply processing
Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
4757d90b15 svcrdma: Report Write/Reply chunk overruns
Observed at Connectathon 2017.

If a client has underestimated the size of a Write or Reply chunk,
the Linux server writes as much payload data as it can, then it
recognizes there was a problem and closes the connection without
sending the transport header.

This creates a couple of problems:

<> The client never receives indication of the server-side failure,
   so it continues to retransmit the bad RPC. Forward progress on
   the transport is blocked.

<> The reply payload pages are not moved out of the svc_rqst, thus
   they can be released by the RPC server before the RDMA Writes
   have completed.

The new rdma_rw-ized helpers return a distinct error code when a
Write/Reply chunk overrun occurs, so it's now easy for the caller
(svc_rdma_sendto) to recognize this case.

Instead of dropping the connection, post an RDMA_ERROR message. The
client now sees an RDMA_ERROR and can properly terminate the RPC
transaction.

As part of the new logic, set up the same delayed release for these
payload pages as would have occurred in the normal case.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
6b19cc5ca2 svcrdma: Clean up RDMA_ERROR path
Now that svc_rdma_sendto has been renovated, svc_rdma_send_error can
be refactored to reduce code duplication and remove C structure-
based XDR encoding. It is also relocated to the source file that
contains its only caller.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
9a6a180b78 svcrdma: Use rdma_rw API in RPC reply path
The current svcrdma sendto code path posts one RDMA Write WR at a
time. Each of these Writes typically carries a small number of pages
(for instance, up to 30 pages for mlx4 devices). That means a 1MB
NFS READ reply requires 9 ib_post_send() calls for the Write WRs,
and one for the Send WR carrying the actual RPC Reply message.

Instead, use the new rdma_rw API. The details of Write WR chain
construction and memory registration are taken care of in the RDMA
core. svcrdma can focus on the details of the RPC-over-RDMA
protocol. This gives three main benefits:

1. All Write WRs for one RDMA segment are posted in a single chain.
As few as one ib_post_send() for each Write chunk.

2. The Write path can now use FRWR to register the Write buffers.
If the device's maximum page list depth is large, this means a
single Write WR is needed for each RPC's Write chunk data.

3. The new code introduces support for RPCs that carry both a Write
list and a Reply chunk. This combination can be used for an NFSv4
READ where the data payload is large, and thus is removed from the
Payload Stream, but the Payload Stream is still larger than the
inline threshold.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
f13193f50b svcrdma: Introduce local rdma_rw API helpers
The plan is to replace the local bespoke code that constructs and
posts RDMA Read and Write Work Requests with calls to the rdma_rw
API. This shares code with other RDMA-enabled ULPs that manages the
gory details of buffer registration and posting Work Requests.

Some design notes:

 o The structure of RPC-over-RDMA transport headers is flexible,
   allowing multiple segments per Reply with arbitrary alignment,
   each with a unique R_key. Write and Send WRs continue to be
   built and posted in separate code paths. However, one whole
   chunk (with one or more RDMA segments apiece) gets exactly
   one ib_post_send and one work completion.

 o svc_xprt reference counting is modified, since a chain of
   rdma_rw_ctx structs generates one completion, no matter how
   many Write WRs are posted.

 o The current code builds the transport header as it is construct-
   ing Write WRs. I've replaced that with marshaling of transport
   header data items in a separate step. This is because the exact
   structure of client-provided segments may not align with the
   components of the server's reply xdr_buf, or the pages in the
   page list. Thus parts of each client-provided segment may be
   written at different points in the send path.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:55 -04:00
Chuck Lever
c238c4c034 svcrdma: Clean up svc_rdma_get_inv_rkey()
Replace C structure-based XDR decoding with more portable code that
instead uses pointer arithmetic.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:54 -04:00
Chuck Lever
c55ab0707b svcrdma: Add helper to save pages under I/O
Clean up: extract the logic to save pages under I/O into a helper to
add a big documenting comment without adding clutter in the send
path.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:54 -04:00
Chuck Lever
b623589dba svcrdma: Eliminate RPCRDMA_SQ_DEPTH_MULT
The Send Queue depth is temporarily reduced to 1 SQE per credit. The
new rdma_rw API does an internal computation, during QP creation, to
increase the depth of the Send Queue to handle RDMA Read and Write
operations.

This change has to come before the NFSD code paths are updated to
use the rdma_rw API. Without this patch, rdma_rw_init_qp() increases
the size of the SQ too much, resulting in memory allocation failures
during QP creation.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:54 -04:00
Chuck Lever
6e6092ca30 svcrdma: Add svc_rdma_map_reply_hdr()
Introduce a helper to DMA-map a reply's transport header before
sending it. This will in part replace the map vector cache.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:54 -04:00
Chuck Lever
17f5f7f506 svcrdma: Move send_wr to svc_rdma_op_ctxt
Clean up: Move the ib_send_wr off the stack, and move common code
to post a Send Work Request into a helper.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-04-25 17:25:54 -04:00
Chuck Lever
2be1fce95e xprtrdma: Remove rpcrdma_buffer::rb_pool
Since commit 1e465fd4ff ("xprtrdma: Replace send and receive
arrays"), this field is no longer used.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:35 -04:00
Chuck Lever
0031e47c76 xprtrdma: Squelch ENOBUFS warnings
When ro_map is out of buffers, that's not a permanent error, so
don't report a problem.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:33 -04:00
Chuck Lever
7d7fa9b550 xprtrdma: Annotate receive workqueue
Micro-optimize the receive workqueue by marking it's anchor "read-
mostly."

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:31 -04:00
Chuck Lever
56a6bd154d xprtrdma: Revert commit d0f36c46de
Device removal is now adequately supported. Pinning the underlying
device driver to prevent removal while an NFS mount is active is no
longer necessary.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:30 -04:00
Chuck Lever
a9b0e381ca xprtrdma: Restore transport after device removal
After a device removal, enable the transport connect worker to
restore normal operation if there is another device with
connectivity to the server.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:28 -04:00
Chuck Lever
1890896b4e xprtrdma: Refactor rpcrdma_ep_connect
I'm about to add another arm to

    if (ep->rep_connected != 0)

It will be cleaner to use a switch statement here. We'll be looking
for a couple of specific errnos, or "anything else," basically to
sort out the difference between a normal reconnect and recovery from
device removal.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:27 -04:00
Chuck Lever
bebd031866 xprtrdma: Support unplugging an HCA from under an NFS mount
The device driver for the underlying physical device associated
with an RPC-over-RDMA transport can be removed while RPC-over-RDMA
transports are still in use (ie, while NFS filesystems are still
mounted and active). The IB core performs a connection event upcall
to request that consumers free all RDMA resources associated with
a transport.

There may be pending RPCs when this occurs. Care must be taken to
release associated resources without leaving references that can
trigger a subsequent crash if a signal or soft timeout occurs. We
rely on the caller of the transport's ->close method to ensure that
the previous RPC task has invoked xprt_release but the transport
remains write-locked.

A DEVICE_REMOVE upcall forces a disconnect then sleeps. When ->close
is invoked, it destroys the transport's H/W resources, then wakes
the upcall, which completes and allows the core driver unload to
continue.

BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=266
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:24 -04:00
Chuck Lever
91a10c5297 xprtrdma: Use same device when mapping or syncing DMA buffers
When the underlying device driver is reloaded, ia->ri_device will be
replaced. All cached copies of that device pointer have to be
updated as well.

Commit 54cbd6b0c6 ("xprtrdma: Delay DMA mapping Send and Receive
buffers") added the rg_device field to each regbuf. As part of
handling a device removal, rpcrdma_dma_unmap_regbuf is invoked on
all regbufs for a transport.

Simply calling rpcrdma_dma_map_regbuf for each Receive buffer after
the driver has been reloaded should reinitialize rg_device correctly
for every case except rpcrdma_wc_receive, which still uses
rpcrdma_rep::rr_device.

Ensure the same device that was used to map a Receive buffer is also
used to sync it in rpcrdma_wc_receive by using rg_device there
instead of rr_device.

This is the only use of rr_device, so it can be removed.

The use of regbufs in the send path is also updated, for
completeness.

Fixes: 54cbd6b0c6 ("xprtrdma: Delay DMA mapping Send and ... ")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:22 -04:00
Chuck Lever
fff09594ed xprtrdma: Refactor rpcrdma_ia_open()
In order to unload a device driver and reload it, xprtrdma will need
to close a transport's interface adapter, and then call
rpcrdma_ia_open again, possibly finding a different interface
adapter.

Make rpcrdma_ia_open safe to call on the same transport multiple
times.

This is a refactoring change only.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:20 -04:00
Chuck Lever
33849792cb xprtrdma: Detect unreachable NFS/RDMA servers more reliably
Current NFS clients rely on connection loss to determine when to
retransmit. In particular, for protocols like NFSv4, clients no
longer rely on RPC timeouts to drive retransmission: NFSv4 servers
are required to terminate a connection when they need a client to
retransmit pending RPCs.

When a server is no longer reachable, either because it has crashed
or because the network path has broken, the server cannot actively
terminate a connection. Thus NFS clients depend on transport-level
keepalive to determine when a connection must be replaced and
pending RPCs retransmitted.

However, RDMA RC connections do not have a native keepalive
mechanism. If an NFS/RDMA server crashes after a client has sent
RPCs successfully (an RC ACK has been received for all OTW RDMA
requests), there is no way for the client to know the connection is
moribund.

In addition, new RDMA requests are subject to the RPC-over-RDMA
credit limit. If the client has consumed all granted credits with
NFS traffic, it is not allowed to send another RDMA request until
the server replies. Thus it has no way to send a true keepalive when
the workload has already consumed all credits with pending RPCs.

To address this, forcibly disconnect a transport when an RPC times
out. This prevents moribund connections from stopping the
detection of failover or other configuration changes on the server.

Note that even if the connection is still good, retransmitting
any RPC will trigger a disconnect thanks to this logic in
xprt_rdma_send_request:

	/* Must suppress retransmit to maintain credits */
	if (req->rl_connect_cookie == xprt->connect_cookie)
		goto drop_connection;
	req->rl_connect_cookie = xprt->connect_cookie;

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:19 -04:00
Chuck Lever
9378b274e1 xprtrdma: Cancel refresh worker during buffer shutdown
Trying to create MRs while the transport is being torn down can
cause a crash.

Fixes: e2ac236c0b ("xprtrdma: Allocate MRs on demand")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-04-25 16:12:14 -04:00
Linus Torvalds
09c8b3d1d6 The restriction of NFSv4 to TCP went overboard and also broke the
backchannel; fix.  Also some minor refinements to the nfsd
 version-setting interface that we'd like to get fixed before release.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJY3weFAAoJECebzXlCjuG+fQYQAKh7QVB/vDZwvjWZ7OGSBhoe
 LJfS1mzzf52MfQk6qNEM9to86qu+ywmH4XD2rvgMdif6Kc0qF1xBzzVEnp527lVW
 nt1nLq/oIXeRl7a+5p+FxTnqHn0OBH+iCnxcVZI8tvHgptpR+6TwEzR36k4n4esN
 kvNrrv9dFIoBGx0nSBScHTC3zNArU+C9oZTTHAuPJICNBHsOMqYF7sSAXPg9NFR+
 HnowZfGWWXpSnWZ9DaM14Zb/dX0B9Pexv1MsgfiKYS9Beh7g4JN48+CHtWyVliwd
 M/LVBpT2ZwFM/NzvJ2exVIqm/hwj4El2Sjy67XHwQzDvGjnUn/fz55SfXfzZSMyD
 PMj+IeHKuT3jipNui1AXAlzYEz8gPvuKQ0vQ0vVuNX4Ln28KydGwvVTkUNltDnfq
 E7L7RI6mj03OY1j1p6zeK6UJeueZq1gmjfq1NVTPO+TgQFPhh8A50NsDEVcaiwNN
 W8uX7Qa39y79BT+4OFuYL05AbuqxKR+nAmCbVSLy9Kq4sc/6/YErBZtXXAghzPPl
 4Es4tzlAd8skkxWlcVeCeUqPfcDCqHL6xKqa62m5wUuYXmqPtIMyAyVutF4lWpH/
 dAV5Lcjz7HeQnpCgFZXXtIQW5OIIfFa08s0f7fuFm+uxz+nM/x8gg99tuwWP6OsT
 Za7EtdB84M1ZGgjO3JhY
 =oi0+
 -----END PGP SIGNATURE-----

Merge tag 'nfsd-4.11-1' of git://linux-nfs.org/~bfields/linux

Pull nfsd fixes from Bruce Fields:
 "The restriction of NFSv4 to TCP went overboard and also broke the
  backchannel; fix.

  Also some minor refinements to the nfsd version-setting interface that
  we'd like to get fixed before release"

* tag 'nfsd-4.11-1' of git://linux-nfs.org/~bfields/linux:
  svcrdma: set XPT_CONG_CTRL flag for bc xprt
  NFSD: fix nfsd_reset_versions for NFSv4.
  NFSD: fix nfsd_minorversion(.., NFSD_AVAIL)
  NFSD: further refinement of content of /proc/fs/nfsd/versions
  nfsd: map the ENOKEY to nfserr_perm for avoiding warning
  SUNRPC/backchanel: set XPT_CONG_CTRL flag for bc xprt
2017-04-01 10:43:37 -07:00
Chuck Lever
23abec20aa svcrdma: set XPT_CONG_CTRL flag for bc xprt
Same change as Kinglong Mee's fix for the TCP backchannel service.

Fixes: 5283b03ee5 ("nfs/nfsd/sunrpc: enforce transport...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-03-28 21:25:55 -04:00
Linus Torvalds
8841b5f0cd NFS client fixes for 4.11
Stable Bugfixes:
 - Fix decrementing nrequests in NFS v4.2 COPY to fix kernel warnings
 - Prevent a double free in async nfs4_exchange_id()
 - Squelch a kbuild sparse complaint for xprtrdma
 
 Other Bugfixes:
 - Fix a typo (NFS_ATTR_FATTR_GROUP_NAME) that causes a memory leak
 - Fix a reference leak that causes kernel warnings
 - Make nfs4_cb_sv_ops static to fix a sparse warning
 - Respect a server's max size in CREATE_SESSION
 - Handle errors from nfs4_pnfs_ds_connect
 - Flexfiles layout shouldn't mark devices as unavailable
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEnZ5MQTpR7cLU7KEp18tUv7ClQOsFAljMQsUACgkQ18tUv7Cl
 QOt0FA//eSieOojEm9uJIxfydrJY2VkPgqg0xmIxLhcMmXi/d4kO9GpS9YeJJZi4
 r5oClq1afhXVR83JmNDCvIYUNwf5/lluckuzXZEYlC3qUbXjQt/Nn/FHfrqW8qXV
 HJy4PVwV+BHnfU6Y7p14zzucGPrMeWZQJO+7mRpboe1jcizHOMdcw+Aim7pr44y6
 BI3QcLPtQGY4CnPOEkpDNuEWtO7iMME3bRJOJ2lOWz5smG0KAQo80OTHGXIe4OqR
 d+gHhoHZ2LbZwdbs+rsjAIMFsFrgXqZmXYbQCZ9SEsr4ysj3PesHPdGFrKXCZCSM
 0MjlEcznGl6ooPDD9tO5Bi047Xhq2TlUWF+FIVYOdFur+7oIcJcnJB7epoYEQ2d2
 6RMvddeKmEgW5Y77myIb3G6jTnk7S8dMq5aAGSyUmKoVhybfw0PGFMbZ2gDEpaTG
 HweeaPmR7J0e+MZBiShTBH2zulFcI1qG3kowu/oKccU9jGi/uA7vkXOSkaxkSzST
 +vS30JwArNOj7OFqhGZbi1YzoK0ixxxXLD4DaEDKKm4mOt7g1Zmb0QgVnGSx1V6X
 Or4Y4xTKn0vCt3e61O9dsBRApBCEVSBJMgYb9Z+LUSdQIKoUj+sQPMzY3iGTefcx
 r7qiUddBZerQ0CZCsRxXk/otJawGCO9XFuSY4CksvlReTeyl1Tc=
 =JY3W
 -----END PGP SIGNATURE-----

Merge tag 'nfs-for-4.11-2' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client fixes from Anna Schumaker:
 "We have a handful of stable fixes to fix kernel warnings and other
  bugs that have been around for a while. We've also found a few other
  reference counting bugs and memory leaks since the initial 4.11 pull.

  Stable Bugfixes:
   - Fix decrementing nrequests in NFS v4.2 COPY to fix kernel warnings
   - Prevent a double free in async nfs4_exchange_id()
   - Squelch a kbuild sparse complaint for xprtrdma

  Other Bugfixes:
   - Fix a typo (NFS_ATTR_FATTR_GROUP_NAME) that causes a memory leak
   - Fix a reference leak that causes kernel warnings
   - Make nfs4_cb_sv_ops static to fix a sparse warning
   - Respect a server's max size in CREATE_SESSION
   - Handle errors from nfs4_pnfs_ds_connect
   - Flexfiles layout shouldn't mark devices as unavailable"

* tag 'nfs-for-4.11-2' of git://git.linux-nfs.org/projects/anna/linux-nfs:
  pNFS/flexfiles: never nfs4_mark_deviceid_unavailable
  pNFS: return status from nfs4_pnfs_ds_connect
  NFSv4.1 respect server's max size in CREATE_SESSION
  NFS prevent double free in async nfs4_exchange_id
  nfs: make nfs4_cb_sv_ops static
  xprtrdma: Squelch kbuild sparse complaint
  NFS: fix the fault nrequests decreasing for nfs_inode COPY
  NFSv4: fix a reference leak caused WARNING messages
  nfs4: fix a typo of NFS_ATTR_FATTR_GROUP_NAME
2017-03-17 14:16:22 -07:00
Chuck Lever
eed50879d6 xprtrdma: Squelch kbuild sparse complaint
New complaint from kbuild for 4.9.y:

net/sunrpc/xprtrdma/verbs.c:489:19: sparse: incompatible types in
    comparison expression (different type sizes)

verbs.c:
489	max_sge = min(ia->ri_device->attrs.max_sge, RPCRDMA_MAX_SEND_SGES);

I can't reproduce this running sparse here. Likewise, "make W=1
net/sunrpc/xprtrdma/verbs.o" never indicated any issue.

A little poking suggests that because the range of its values is
small, gcc can make the actual width of RPCRDMA_MAX_SEND_SGES
smaller than the width of an unsigned integer.

Fixes: 16f906d66c ("xprtrdma: Reduce required number of send SGEs")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-03-17 16:05:21 -04:00
Linus Torvalds
8f03cf50bc NFS client updates for Linux 4.11
Stable bugfixes:
 - NFSv4: Fix memory and state leak in _nfs4_open_and_get_state
 - xprtrdma: Fix Read chunk padding
 - xprtrdma: Per-connection pad optimization
 - xprtrdma: Disable pad optimization by default
 - xprtrdma: Reduce required number of send SGEs
 - nlm: Ensure callback code also checks that the files match
 - pNFS/flexfiles: If the layout is invalid, it must be updated before retrying
 - NFSv4: Fix reboot recovery in copy offload
 - Revert "NFSv4.1: Handle NFS4ERR_BADSESSION/NFS4ERR_DEADSESSION replies to OP_SEQUENCE"
 - NFSv4: fix getacl head length estimation
 - NFSv4: fix getacl ERANGE for sum ACL buffer sizes
 
 Features:
 - Add and use dprintk_cont macros
 - Various cleanups to NFS v4.x to reduce code duplication and complexity
 - Remove unused cr_magic related code
 - Improvements to sunrpc "read from buffer" code
 - Clean up sunrpc timeout code and allow changing TCP timeout parameters
 - Remove duplicate mw_list management code in xprtrdma
 - Add generic functions for encoding and decoding xdr streams
 
 Bugfixes:
 - Clean up nfs_show_mountd_netid
 - Make layoutreturn_ops static and use NULL instead of 0 to fix sparse warnings
 - Properly handle -ERESTARTSYS in nfs_rename()
 - Check if register_shrinker() failed during rpcauth_init()
 - Properly clean up procfs/pipefs entries
 - Various NFS over RDMA related fixes
 - Silence unititialized variable warning in sunrpc
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEnZ5MQTpR7cLU7KEp18tUv7ClQOsFAli3F7YACgkQ18tUv7Cl
 QOvzrQ//dL+nnBaqsm9bA2wwuVJSQ2R1zdkwHOCWghEWROZrQHzpi0VHu0ZKBLzr
 YsYFhHvIPax9Q8USY4B/QFQ3eUuZILEVn+xDruRxZaJPnsA4Zmr16VJwGF2F68Lh
 CGekA5qybqy8lAG6v96Gyjbi+JqjHNCmelYWRv7SX9IZcDjNJpsEbrSI4LkabTWh
 70WtCl3LBzVMRYRxe8+f0mcx4g4XCQ8pDaQRgRnfKtNeQk/+PgWz66xSNinDakVb
 A8AkaiUadPRgUTpap6HfBSicpRvtLQeLhARC0E4YE5pXp2H/kUt2MFe5szblfSCv
 zf2nrPUbNEHjBypFhERzCZZk6EonY6FeOojyW0g2C+rmPdK7WLlKbwTQFxdRGvsx
 78fIiPRdlDHDp9CXzD8V4xxRBJX/KkicA1Vp8CoyQtmpzpu2fjwT0kr9HeD+aEe6
 293+72QUfk05re2HYWF9MCGGVVLdnLLjrKCgwwRQ0HX5WF6GNQxX/yVgBVlqFeV3
 xc8m7ltKco5N9JxIqwlIpySq2e114EQOqsmHYz3gxd7ID9J1NJz+9H2z2EvgAKZ7
 wIPSLoZrdBdnoXG8ZDDTAvPKeB8l6egi6wjrvGKxewVlMbjzogdARsMKWoifnCfG
 HMkH+IEvLGvFc1pPeLbscJGEdVWXVn0thO+8fkS9F9sE/zMX9PA=
 =01DU
 -----END PGP SIGNATURE-----

Merge tag 'nfs-for-4.11-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

Pull NFS client updates from Anna Schumaker:
 "Highlights include:

  Stable bugfixes:
   - NFSv4: Fix memory and state leak in _nfs4_open_and_get_state
   - xprtrdma: Fix Read chunk padding
   - xprtrdma: Per-connection pad optimization
   - xprtrdma: Disable pad optimization by default
   - xprtrdma: Reduce required number of send SGEs
   - nlm: Ensure callback code also checks that the files match
   - pNFS/flexfiles: If the layout is invalid, it must be updated before
     retrying
   - NFSv4: Fix reboot recovery in copy offload
   - Revert "NFSv4.1: Handle NFS4ERR_BADSESSION/NFS4ERR_DEADSESSION
     replies to OP_SEQUENCE"
   - NFSv4: fix getacl head length estimation
   - NFSv4: fix getacl ERANGE for sum ACL buffer sizes

  Features:
   - Add and use dprintk_cont macros
   - Various cleanups to NFS v4.x to reduce code duplication and
     complexity
   - Remove unused cr_magic related code
   - Improvements to sunrpc "read from buffer" code
   - Clean up sunrpc timeout code and allow changing TCP timeout
     parameters
   - Remove duplicate mw_list management code in xprtrdma
   - Add generic functions for encoding and decoding xdr streams

  Bugfixes:
   - Clean up nfs_show_mountd_netid
   - Make layoutreturn_ops static and use NULL instead of 0 to fix
     sparse warnings
   - Properly handle -ERESTARTSYS in nfs_rename()
   - Check if register_shrinker() failed during rpcauth_init()
   - Properly clean up procfs/pipefs entries
   - Various NFS over RDMA related fixes
   - Silence unititialized variable warning in sunrpc"

* tag 'nfs-for-4.11-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (64 commits)
  NFSv4: fix getacl ERANGE for some ACL buffer sizes
  NFSv4: fix getacl head length estimation
  Revert "NFSv4.1: Handle NFS4ERR_BADSESSION/NFS4ERR_DEADSESSION replies to OP_SEQUENCE"
  NFSv4: Fix reboot recovery in copy offload
  pNFS/flexfiles: If the layout is invalid, it must be updated before retrying
  NFSv4: Clean up owner/group attribute decode
  SUNRPC: Add a helper function xdr_stream_decode_string_dup()
  NFSv4: Remove bogus "struct nfs_client" argument from decode_ace()
  NFSv4: Fix the underestimation of delegation XDR space reservation
  NFSv4: Replace callback string decode function with a generic
  NFSv4: Replace the open coded decode_opaque_inline() with the new generic
  NFSv4: Replace ad-hoc xdr encode/decode helpers with xdr_stream_* generics
  SUNRPC: Add generic helpers for xdr_stream encode/decode
  sunrpc: silence uninitialized variable warning
  nlm: Ensure callback code also checks that the files match
  sunrpc: Allow xprt->ops->timer method to sleep
  xprtrdma: Refactor management of mw_list field
  xprtrdma: Handle stale connection rejection
  xprtrdma: Properly recover FRWRs with in-flight FASTREG WRs
  xprtrdma: Shrink send SGEs array
  ...
2017-03-01 16:10:30 -08:00
Linus Torvalds
8313064c2e The nfsd update this round is mainly a lot of miscellaneous cleanups and
bugfixes.
 
 A couple changes could theoretically break working setups on upgrade.  I
 don't expect complaints in practice, but they seem worth calling out
 just in case:
 
 	- NFS security labels are now off by default; a new
 	  security_label export flag reenables it per export.  But,
 	  having them on by default is a disaster, as it generally only
 	  makes sense if all your clients and servers have similar
 	  enough selinux policies.  Thanks to Jason Tibbitts for
 	  pointing this out.
 
 	- NFSv4/UDP support is off.  It was never really supported, and
 	  the spec explicitly forbids it.  We only ever left it on out
 	  of laziness; thanks to Jeff Layton for finally fixing that.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJYtejbAAoJECebzXlCjuG+JhEQAK3YTYYNrPY26Pfiu0FghLFV
 4qOHK4DOkJzrWIom5uWyBo7yOwH6WnQtTe/gCx/voOEW3lsJO7F3IfTnTVp+Smp6
 GJeVtsr1vI9EBnwhMlyoJ5hZ2Ju5kX3MBVnew6+momt6620ZO7a+EtT+74ePaY8Y
 jxLzWVA1UqbWYoMabNQpqgKypKvNrhwst72iYyBhNuL/qtGeBDQWwcrA+TFeE9tv
 Ad7qB53xL1mr0Wn1CNIOR/IzVAj4o2H0vdjqrPjAdvbfwf8YYLNpJXt5k591wx/j
 1TpiWIPqnwLjMT3X5NkQN3agZKeD+2ZWPrClr35TgRRe62CK6JblK9/Wwc5BRSzV
 paMP3hOm6/dQOBA5C+mqPaHdEI8VqcHyZpxU4VC/ttsVEGTgaLhGwHGzSn+5lYiM
 Qx9Sh50yFV3oiBW/sb/y8lBDwYm/Cq0OyqAU277idbdzjcFerMg1qt06tjEQhYMY
 K2V7rS8NuADUF6F1BwOONZzvg7Rr7iWHmLh+iSM9TeQoEmz2jIHSaLIFaYOET5Jr
 PIZS3rOYoa0FaKOYVYnZMC74n/LqP/Aou8B+1rRcLy5YEdUIIIVpFvqpg1nGv6PI
 sA3zx/f13IRte3g0CuQiY0/2cx7uXk/gXJ7s5+ejEzljF/aYWiomx3mr6HqPQETn
 CWEtXlfyJCyX+A8hbO+U
 =iLLz
 -----END PGP SIGNATURE-----

Merge tag 'nfsd-4.11' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "The nfsd update this round is mainly a lot of miscellaneous cleanups
  and bugfixes.

  A couple changes could theoretically break working setups on upgrade.
  I don't expect complaints in practice, but they seem worth calling out
  just in case:

   - NFS security labels are now off by default; a new security_label
     export flag reenables it per export. But, having them on by default
     is a disaster, as it generally only makes sense if all your clients
     and servers have similar enough selinux policies. Thanks to Jason
     Tibbitts for pointing this out.

   - NFSv4/UDP support is off. It was never really supported, and the
     spec explicitly forbids it. We only ever left it on out of
     laziness; thanks to Jeff Layton for finally fixing that"

* tag 'nfsd-4.11' of git://linux-nfs.org/~bfields/linux: (34 commits)
  nfsd: Fix display of the version string
  nfsd: fix configuration of supported minor versions
  sunrpc: don't register UDP port with rpcbind when version needs congestion control
  nfs/nfsd/sunrpc: enforce transport requirements for NFSv4
  sunrpc: flag transports as having congestion control
  sunrpc: turn bitfield flags in svc_version into bools
  nfsd: remove superfluous KERN_INFO
  nfsd: special case truncates some more
  nfsd: minor nfsd_setattr cleanup
  NFSD: Reserve adequate space for LOCKT operation
  NFSD: Get response size before operation for all RPCs
  nfsd/callback: Drop a useless data copy when comparing sessionid
  nfsd/callback: skip the callback tag
  nfsd/callback: Cleanup callback cred on shutdown
  nfsd/idmap: return nfserr_inval for 0-length names
  SUNRPC/Cache: Always treat the invalid cache as unexpired
  SUNRPC: Drop all entries from cache_detail when cache_purge()
  svcrdma: Poll CQs in "workqueue" mode
  svcrdma: Combine list fields in struct svc_rdma_op_ctxt
  svcrdma: Remove unused sc_dto_q field
  ...
2017-02-28 15:39:09 -08:00
Jeff Layton
362142b258 sunrpc: flag transports as having congestion control
NFSv4 requires a transport protocol with congestion control in most
cases.

On an IP network, that means that NFSv4 over UDP should be forbidden.

The situation with RDMA is a bit more nuanced, but most RDMA transports
are suitable for this. For now, we assume that all RDMA transports are
suitable, but we may need to revise that at some point.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-24 16:55:46 -05:00
Linus Torvalds
3051bf36c2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller:
 "Highlights:

   1) Support TX_RING in AF_PACKET TPACKET_V3 mode, from Sowmini
      Varadhan.

   2) Simplify classifier state on sk_buff in order to shrink it a bit.
      From Willem de Bruijn.

   3) Introduce SIPHASH and it's usage for secure sequence numbers and
      syncookies. From Jason A. Donenfeld.

   4) Reduce CPU usage for ICMP replies we are going to limit or
      suppress, from Jesper Dangaard Brouer.

   5) Introduce Shared Memory Communications socket layer, from Ursula
      Braun.

   6) Add RACK loss detection and allow it to actually trigger fast
      recovery instead of just assisting after other algorithms have
      triggered it. From Yuchung Cheng.

   7) Add xmit_more and BQL support to mvneta driver, from Simon Guinot.

   8) skb_cow_data avoidance in esp4 and esp6, from Steffen Klassert.

   9) Export MPLS packet stats via netlink, from Robert Shearman.

  10) Significantly improve inet port bind conflict handling, especially
      when an application is restarted and changes it's setting of
      reuseport. From Josef Bacik.

  11) Implement TX batching in vhost_net, from Jason Wang.

  12) Extend the dummy device so that VF (virtual function) features,
      such as configuration, can be more easily tested. From Phil
      Sutter.

  13) Avoid two atomic ops per page on x86 in bnx2x driver, from Eric
      Dumazet.

  14) Add new bpf MAP, implementing a longest prefix match trie. From
      Daniel Mack.

  15) Packet sample offloading support in mlxsw driver, from Yotam Gigi.

  16) Add new aquantia driver, from David VomLehn.

  17) Add bpf tracepoints, from Daniel Borkmann.

  18) Add support for port mirroring to b53 and bcm_sf2 drivers, from
      Florian Fainelli.

  19) Remove custom busy polling in many drivers, it is done in the core
      networking since 4.5 times. From Eric Dumazet.

  20) Support XDP adjust_head in virtio_net, from John Fastabend.

  21) Fix several major holes in neighbour entry confirmation, from
      Julian Anastasov.

  22) Add XDP support to bnxt_en driver, from Michael Chan.

  23) VXLAN offloads for enic driver, from Govindarajulu Varadarajan.

  24) Add IPVTAP driver (IP-VLAN based tap driver) from Sainath Grandhi.

  25) Support GRO in IPSEC protocols, from Steffen Klassert"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1764 commits)
  Revert "ath10k: Search SMBIOS for OEM board file extension"
  net: socket: fix recvmmsg not returning error from sock_error
  bnxt_en: use eth_hw_addr_random()
  bpf: fix unlocking of jited image when module ronx not set
  arch: add ARCH_HAS_SET_MEMORY config
  net: napi_watchdog() can use napi_schedule_irqoff()
  tcp: Revert "tcp: tcp_probe: use spin_lock_bh()"
  net/hsr: use eth_hw_addr_random()
  net: mvpp2: enable building on 64-bit platforms
  net: mvpp2: switch to build_skb() in the RX path
  net: mvpp2: simplify MVPP2_PRS_RI_* definitions
  net: mvpp2: fix indentation of MVPP2_EXT_GLOBAL_CTRL_DEFAULT
  net: mvpp2: remove unused register definitions
  net: mvpp2: simplify mvpp2_bm_bufs_add()
  net: mvpp2: drop useless fields in mvpp2_bm_pool and related code
  net: mvpp2: remove unused 'tx_skb' field of 'struct mvpp2_tx_queue'
  net: mvpp2: release reference to txq_cpu[] entry after unmapping
  net: mvpp2: handle too large value in mvpp2_rx_time_coal_set()
  net: mvpp2: handle too large value handling in mvpp2_rx_pkts_coal_set()
  net: mvpp2: remove useless arguments in mvpp2_rx_{pkts, time}_coal_set
  ...
2017-02-22 10:15:09 -08:00
Linus Torvalds
42e1b14b6e Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Implement wraparound-safe refcount_t and kref_t types based on
     generic atomic primitives (Peter Zijlstra)

   - Improve and fix the ww_mutex code (Nicolai Hähnle)

   - Add self-tests to the ww_mutex code (Chris Wilson)

   - Optimize percpu-rwsems with the 'rcuwait' mechanism (Davidlohr
     Bueso)

   - Micro-optimize the current-task logic all around the core kernel
     (Davidlohr Bueso)

   - Tidy up after recent optimizations: remove stale code and APIs,
     clean up the code (Waiman Long)

   - ... plus misc fixes, updates and cleanups"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (50 commits)
  fork: Fix task_struct alignment
  locking/spinlock/debug: Remove spinlock lockup detection code
  lockdep: Fix incorrect condition to print bug msgs for MAX_LOCKDEP_CHAIN_HLOCKS
  lkdtm: Convert to refcount_t testing
  kref: Implement 'struct kref' using refcount_t
  refcount_t: Introduce a special purpose refcount type
  sched/wake_q: Clarify queue reinit comment
  sched/wait, rcuwait: Fix typo in comment
  locking/mutex: Fix lockdep_assert_held() fail
  locking/rtmutex: Flip unlikely() branch to likely() in __rt_mutex_slowlock()
  locking/rwsem: Reinit wake_q after use
  locking/rwsem: Remove unnecessary atomic_long_t casts
  jump_labels: Move header guard #endif down where it belongs
  locking/atomic, kref: Implement kref_put_lock()
  locking/ww_mutex: Turn off __must_check for now
  locking/atomic, kref: Avoid more abuse
  locking/atomic, kref: Use kref_get_unless_zero() more
  locking/atomic, kref: Kill kref_sub()
  locking/atomic, kref: Add kref_read()
  locking/atomic, kref: Add KREF_INIT()
  ...
2017-02-20 13:23:30 -08:00
Chuck Lever
9a5c63e9c4 xprtrdma: Refactor management of mw_list field
Clean up some duplicate code.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:37 -05:00
Chuck Lever
0a90487bf7 xprtrdma: Handle stale connection rejection
A server rejects a connection attempt with STALE_CONNECTION when a
client attempts to connect to a working remote service, but uses a
QPN and GUID that corresponds to an old connection that was
abandoned. This might occur after a client crashes and restarts.

Fix rpcrdma_conn_upcall() to distinguish between a normal rejection
and rejection of stale connection parameters.

As an additional clean-up, remove the code that retries the
connection attempt with different ORD/IRD values. Code audit of
other ULP initiators shows no similar special case handling of
initiator_depth or responder_resources.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
18c0fb31a0 xprtrdma: Properly recover FRWRs with in-flight FASTREG WRs
Sriharsha (sriharsha.basavapatna@broadcom.com) reports an occasional
double DMA unmap of an FRWR MR when a connection is lost. I see one
way this can happen.

When a request requires more than one segment or chunk,
rpcrdma_marshal_req loops, invoking ->frwr_op_map for each segment
(MR) in each chunk. Each call posts a FASTREG Work Request to
register one MR.

Now suppose that the transport connection is lost part-way through
marshaling this request. As part of recovering and resetting that
req, rpcrdma_marshal_req invokes ->frwr_op_unmap_safe, which hands
all the req's registered FRWRs to the MR recovery thread.

But note: FRWR registration is asynchronous. So it's possible that
some of these "already registered" FRWRs are fully registered, and
some are still waiting for their FASTREG WR to complete.

When the connection is lost, the "already registered" frmrs are
marked FRMR_IS_VALID, and the "still waiting" WRs flush. Then
frwr_wc_fastreg marks these frmrs FRMR_FLUSHED_FR.

But thanks to ->frwr_op_unmap_safe, the MR recovery thread is doing
an unreg / alloc_mr, a DMA unmap, and marking each of these frwrs
FRMR_IS_INVALID, at the same time frwr_wc_fastreg might be running.

- If the recovery thread runs last, then the frmr is marked
FRMR_IS_INVALID, and life continues.

- If frwr_wc_fastreg runs last, the frmr is marked FRMR_FLUSHED_FR,
but the recovery thread has already DMA unmapped that MR. When
->frwr_op_map later re-uses this frmr, it sees it is not marked
FRMR_IS_INVALID, and tries to recover it before using it, resulting
in a second DMA unmap of the same MR.

The fix is to guarantee in-flight FASTREG WRs have flushed before MR
recovery runs on those FRWRs. Thus we depend on ro_unmap_safe
(called from xprt_rdma_send_request on retransmit, or from
xprt_rdma_free) to clean up old registrations as needed.

Reported-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
c6f5b47f9f xprtrdma: Shrink send SGEs array
We no longer need to accommodate an xdr_buf whose pages start at an
offset and cross extra page boundaries. If there are more partial or
whole pages to send than there are available SGEs, the marshaling
logic is now smart enough to use a Read chunk instead of failing.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
16f906d66c xprtrdma: Reduce required number of send SGEs
The MAX_SEND_SGES check introduced in commit 655fec6987
("xprtrdma: Use gathered Send for large inline messages") fails
for devices that have a small max_sge.

Instead of checking for a large fixed maximum number of SGEs,
check for a minimum small number. RPC-over-RDMA will switch to
using a Read chunk if an xdr_buf has more pages than can fit in
the device's max_sge limit. This is considerably better than
failing all together to mount the server.

This fix supports devices that have as few as three send SGEs
available.

Reported-by: Selvin Xavier <selvin.xavier@broadcom.com>
Reported-by: Devesh Sharma <devesh.sharma@broadcom.com>
Reported-by: Honggang Li <honli@redhat.com>
Reported-by: Ram Amrani <Ram.Amrani@cavium.com>
Fixes: 655fec6987 ("xprtrdma: Use gathered Send for large ...")
Cc: stable@vger.kernel.org # v4.9+
Tested-by: Honggang Li <honli@redhat.com>
Tested-by: Ram Amrani <Ram.Amrani@cavium.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
c95a3c6b88 xprtrdma: Disable pad optimization by default
Commit d5440e27d3 ("xprtrdma: Enable pad optimization") made the
Linux client omit XDR round-up padding in normal Read and Write
chunks so that the client doesn't have to register and invalidate
3-byte memory regions that contain no real data.

Unfortunately, my cheery 2014 assessment that this optimization "is
supported now by both Linux and Solaris servers" was premature.
We've found bugs in Solaris in this area since commit d5440e27d3
("xprtrdma: Enable pad optimization") was merged (SYMLINK is the
main offender).

So for maximum interoperability, I'm disabling this optimization
again. If a CM private message is exchanged when connecting, the
client recognizes that the server is Linux, and enables the
optimization for that connection.

Until now the Solaris server bugs did not impact common operations,
and were thus largely benign. Soon, less capable devices on Linux
NFS/RDMA clients will make use of Read chunks more often, and these
Solaris bugs will prevent interoperation in more cases.

Fixes: 677eb17e94 ("xprtrdma: Fix XDR tail buffer marshalling")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
b5f0afbea4 xprtrdma: Per-connection pad optimization
Pad optimization is changed by echoing into
/proc/sys/sunrpc/rdma_pad_optimize. This is a global setting,
affecting all RPC-over-RDMA connections to all servers.

The marshaling code picks up that value and uses it for decisions
about how to construct each RPC-over-RDMA frame. Having it change
suddenly in mid-operation can result in unexpected failures. And
some servers a client mounts might need chunk round-up, while
others don't.

So instead, copy the pad_optimize setting into each connection's
rpcrdma_ia when the transport is created, and use the copy, which
can't change during the life of the connection, instead.

This also removes a hack: rpcrdma_convert_iovs was using
the remote-invalidation-expected flag to predict when it could leave
out Write chunk padding. This is because the Linux server handles
implicit XDR padding on Write chunks correctly, and only Linux
servers can set the connection's remote-invalidation-expected flag.

It's more sensible to use the pad optimization setting instead.

Fixes: 677eb17e94 ("xprtrdma: Fix XDR tail buffer marshalling")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Chuck Lever
24abdf1be1 xprtrdma: Fix Read chunk padding
When pad optimization is disabled, rpcrdma_convert_iovs still
does not add explicit XDR round-up padding to a Read chunk.

Commit 677eb17e94 ("xprtrdma: Fix XDR tail buffer marshalling")
incorrectly short-circuited the test for whether round-up padding
is needed that appears later in rpcrdma_convert_iovs.

However, if this is indeed a regular Read chunk (and not a
Position-Zero Read chunk), the tail iovec _always_ contains the
chunk's padding, and never anything else.

So, it's easy to just skip the tail when padding optimization is
enabled, and add the tail in a subsequent Read chunk segment, if
disabled.

Fixes: 677eb17e94 ("xprtrdma: Fix XDR tail buffer marshalling")
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2017-02-10 14:02:36 -05:00
Russell King
f39b2dde48 net: sunrpc: fix build errors when linux/phy*.h is removed from net/dsa.h
Removing linux/phy.h from net/dsa.h reveals a build error in the sunrpc
code:

net/sunrpc/xprtrdma/svc_rdma_backchannel.c: In function 'xprt_rdma_bc_put':
net/sunrpc/xprtrdma/svc_rdma_backchannel.c:277:2: error: implicit declaration of function 'module_put' [-Werror=implicit-function-declaration]
net/sunrpc/xprtrdma/svc_rdma_backchannel.c: In function 'xprt_setup_rdma_bc':
net/sunrpc/xprtrdma/svc_rdma_backchannel.c:348:7: error: implicit declaration of function 'try_module_get' [-Werror=implicit-function-declaration]

Fix this by adding linux/module.h to svc_rdma_backchannel.c

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-02-10 13:51:01 -05:00
Chuck Lever
81fa3275f9 svcrdma: Poll CQs in "workqueue" mode
svcrdma calls svc_xprt_put() in its completion handlers, which
currently run in IRQ context.

However, svc_xprt_put() is meant to be invoked in process context,
not in IRQ context. After the last transport reference is gone, it
directly calls a transport release function that expects to run in
process context.

Change the CQ polling modes to IB_POLL_WORKQUEUE so that svcrdma
invokes svc_xprt_put() only in process context. As an added benefit,
bottom half-disabled spin locking can be eliminated from I/O paths.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:42:01 -05:00
Chuck Lever
a3ab867fa6 svcrdma: Combine list fields in struct svc_rdma_op_ctxt
Clean up: The free list and the dto_q list fields are never used at
the same time. Reduce the size of struct svc_rdma_op_ctxt by
combining these fields.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:42:00 -05:00
Chuck Lever
aba7d14ba1 svcrdma: Remove unused sc_dto_q field
Clean up. Commit be99bb1140 ("svcrdma: Use new CQ API for
RPC-over-RDMA server send CQs") removed code that used the sc_dto_q
field, but neglected to remove sc_dto_q at the same time.

Fixes: be99bb1140 ("svcrdma: Use new CQ API for RPC-over- ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:41:59 -05:00
Chuck Lever
c2ccf64a6c svcrdma: Clean up backchannel send header encoding
Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:41:58 -05:00
Chuck Lever
647e18e3bd svcrdma: Clean up RPC-over-RDMA Call header decoder
Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable.

Rename the "decode" functions. Nothing is decoded here, they
perform only transport header sanity checking. Use existing XDR
naming conventions to help readability.

Straight-line the hot path:
 - relocate the dprintk call sites out of line
 - remove unnecessary byte-swapping
 - reduce count of conditional branches

Deprecate RDMA_MSGP. It's not properly spec'd by RFC5666, and
therefore never used by any V1 client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:41:57 -05:00
Chuck Lever
98fc21d3bf svcrdma: Clean up RPC-over-RDMA Reply header encoder
Replace C structure-based XDR decoding with pointer arithmetic.
Pointer arithmetic is considered more portable, and is used
throughout the kernel's existing XDR encoders. The gcc optimizer
generates similar assembler code either way.

Byte-swapping before a memory store on x86 typically results in an
instruction pipeline stall. Avoid byte-swapping when encoding a new
header.

svcrdma currently doesn't alter a connection's credit grant value
after the connection has been accepted, so it is effectively a
constant. Cache the byte-swapped value in a separate field.

Christoph suggested pulling the header encoding logic into the only
function that uses it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:41:41 -05:00
Chuck Lever
cbaf58032e svcrdma: Another sendto chunk list parsing update
Commit 5fdca65314 ("svcrdma: Renovate sendto chunk list parsing")
missed a spot. svc_rdma_xdr_get_reply_hdr_len() also assumes the
Write list has only one Write chunk. There's no harm in making this
code more general.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-02-08 14:41:24 -05:00
Peter Zijlstra
2c935bc572 locking/atomic, kref: Add kref_read()
Since we need to change the implementation, stop exposing internals.

Provide kref_read() to read the current reference count; typically
used for debug messages.

Kills two anti-patterns:

	atomic_read(&kref->refcount)
	kref->refcount.counter

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-01-14 11:37:18 +01:00
Sriharsha Basavapatna
ce1ca7d2d1 svcrdma: avoid duplicate dma unmapping during error recovery
In rdma_read_chunk_frmr() when ib_post_send() fails, the error code path
invokes ib_dma_unmap_sg() to unmap the sg list. It then invokes
svc_rdma_put_frmr() which in turn tries to unmap the same sg list through
ib_dma_unmap_sg() again. This second unmap is invalid and could lead to
problems when the iova being unmapped is subsequently reused. Remove
the call to unmap in rdma_read_chunk_frmr() and let svc_rdma_put_frmr()
handle it.

Fixes: 412a15c0fe ("svcrdma: Port to new memory registration API")
Cc: stable@vger.kernel.org
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2017-01-12 16:14:47 -05:00
Linus Torvalds
759b2656b2 The one new feature is support for a new NFSv4.2 mode_umask attribute
that makes ACL inheritance a little more useful in environments that
 default to restrictive umasks.  Requires client-side support, also on
 its way for 4.10.
 
 Other than that, miscellaneous smaller fixes and cleanup, especially to
 the server rdma code.
 -----BEGIN PGP SIGNATURE-----
 
 iQIcBAABAgAGBQJYVAEqAAoJECebzXlCjuG+VM0QAKaR+ibSM31Ahpnrgit5/wrb
 n630KDFztO7iqEeuHfPQ4/n05T2QR0JWsLpjLMFvx88Gy4gyXYk9cuDPIrNKX1IS
 3/nnhBo0+EVnjODjufommCrtbPZlqOSsS3N03vWkB7rTi8QYsWBOThh+XLRJYOXo
 LZzJE1WmXNeCXV1kXPBsauryywql1fmwTXBzmIf1HbzoGAVROMEA2qqh4Z3nb7BP
 sJuGchWx0STBOuAa278ighXQPUW2lUft9uzw2bssOtMwfNyOs/Pd6nx4F1Lg6WwD
 1UQXoiR8K3PqelZfoeFJ05v0css/sbNKep+huWRdOXZj3Kjpa20lKBX8xHfat7sN
 1OQ4FHx8ToigX3c+wwtlCqRMCcIxqUYkRjqzPHyeBiSSSp0rLrId44rI5x/K0yay
 3bkGw7hFDSzc0Nq2uZgmtlbyTC71hLNhkWe7ThofcVG/pS0JtAqBiKIVwXJPh/e0
 PLmVHYGU6Xowjag5edJlXY1tlIlxtWfqsWUarCXS5bfKUa3UjMVSjyuljsDqqJsn
 96fEWu7DiUo4HeGYmf8MJoeZYV2y0DKSQGeguVkUKWp2DoTzinQHTfdKvrZVwNuu
 hVE9/QeWzUvPY13HOUaKD2skozhbUChqv0NHESKUv8gxE3svTEpYZkXrE74WNqMk
 l/WXAhw+RdKZof4+qdjU
 =JANY
 -----END PGP SIGNATURE-----

Merge tag 'nfsd-4.10' of git://linux-nfs.org/~bfields/linux

Pull nfsd updates from Bruce Fields:
 "The one new feature is support for a new NFSv4.2 mode_umask attribute
  that makes ACL inheritance a little more useful in environments that
  default to restrictive umasks. Requires client-side support, also on
  its way for 4.10.

  Other than that, miscellaneous smaller fixes and cleanup, especially
  to the server rdma code"

[ The client side of the umask attribute was merged yesterday ]

* tag 'nfsd-4.10' of git://linux-nfs.org/~bfields/linux:
  nfsd: add support for the umask attribute
  sunrpc: use DEFINE_SPINLOCK()
  svcrdma: Further clean-up of svc_rdma_get_inv_rkey()
  svcrdma: Break up dprintk format in svc_rdma_accept()
  svcrdma: Remove unused variable in rdma_copy_tail()
  svcrdma: Remove unused variables in xprt_rdma_bc_allocate()
  svcrdma: Remove svc_rdma_op_ctxt::wc_status
  svcrdma: Remove DMA map accounting
  svcrdma: Remove BH-disabled spin locking in svc_rdma_send()
  svcrdma: Renovate sendto chunk list parsing
  svcauth_gss: Close connection when dropping an incoming message
  svcrdma: Clear xpt_bc_xps in xprt_setup_rdma_bc() error exit arm
  nfsd: constify reply_cache_stats_operations structure
  nfsd: update workqueue creation
  sunrpc: GFP_KERNEL should be GFP_NOFS in crypto code
  nfsd: catch errors in decode_fattr earlier
  nfsd: clean up supported attribute handling
  nfsd: fix error handling for clients that fail to return the layout
  nfsd: more robust allocation failure handling in nfsd_reply_cache_init
2016-12-16 10:48:28 -08:00
Chuck Lever
fafedf8170 svcrdma: Further clean-up of svc_rdma_get_inv_rkey()
No longer any need for the dprintk().

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:16 -05:00
Chuck Lever
0725745020 svcrdma: Break up dprintk format in svc_rdma_accept()
The current code results in:

Nov  7 14:50:19 klimt kernel: svcrdma: newxprt->sc_cm_id=ffff88085590c800,
 newxprt->sc_pd=ffff880852a7ce00#012    cm_id->device=ffff88084dd20000,
 sc_pd->device=ffff88084dd20000#012    cap.max_send_wr = 272#012
 cap.max_recv_wr = 34#012    cap.max_send_sge = 32#012
 cap.max_recv_sge = 32
Nov  7 14:50:19 klimt kernel: svcrdma: new connection ffff880855908000
 accepted with the following attributes:#012    local_ip        :
 10.0.0.5#012    local_port#011     : 20049#012    remote_ip       :
 10.0.0.2#012    remote_port     : 59909#012    max_sge         : 32#012
 max_sge_rd      : 30#012    sq_depth        : 272#012    max_requests    :
 32#012    ord             : 16

Split up the output over multiple dprintks and take the opportunity
to fix the display of IPv6 addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:16 -05:00
Chuck Lever
f5426d37f6 svcrdma: Remove unused variable in rdma_copy_tail()
Clean up.

linux-2.6/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c: In function
 ‘rdma_copy_tail’:
linux-2.6/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c:376:6: warning:
 variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret;
      ^

Fixes: a97c331f9a ("svcrdma: Handle additional inline content")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:15 -05:00
Chuck Lever
9a16a34d21 svcrdma: Remove unused variables in xprt_rdma_bc_allocate()
Clean up.

/linux-2.6/net/sunrpc/xprtrdma/svc_rdma_backchannel.c: In function
 ‘xprt_rdma_bc_allocate’:
linux-2.6/net/sunrpc/xprtrdma/svc_rdma_backchannel.c:169:23: warning:
 variable ‘rdma’ set but not used [-Wunused-but-set-variable]
  struct svcxprt_rdma *rdma;
                       ^

Fixes: 5d252f90a8 ("svcrdma: Add class for RDMA backwards ...")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:14 -05:00
Chuck Lever
96a58f9c19 svcrdma: Remove svc_rdma_op_ctxt::wc_status
Clean up: Completion status is already reported in the individual
completion handlers. Save a few bytes in struct svc_rdma_op_ctxt.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:14 -05:00
Chuck Lever
dd6fd213b0 svcrdma: Remove DMA map accounting
Clean up: sc_dma_used is not required for correct operation. It is
simply a debugging tool to report when svcrdma has leaked DMA maps.

However, manipulating an atomic has a measurable CPU cost, and DMA
map accounting specific to svcrdma will be meaningless once svcrdma
is converted to use the new generic r/w API.

A similar kind of debug accounting can be done simply by enabling
the IOMMU or by using CONFIG_DMA_API_DEBUG, CONFIG_IOMMU_DEBUG, and
CONFIG_IOMMU_LEAK.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2016-11-30 17:31:13 -05:00