- 20 Sep, 2019 6 commits
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Benjamin Coddington authored
Signed-off-by:
Benjamin Coddington <bcodding@redhat.com> Signed-off-by:
Anna Schumaker <Anna.Schumaker@Netapp.com>
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Benjamin Coddington authored
Since commit b0c6108e ("nfs_instantiate(): prevent multiple aliases for directory inode"), nfs_instantiate() may succeed without actually instantiating the dentry that was passed in. That can be problematic for some callers in NFSv3, so this patch breaks things up so we can get the actual dentry obtained. Signed-off-by:
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Chuck Lever authored
If the congestion window closes just as the transport disconnects, a reconnect is never driven because: 1. The XPRT_CONG_WAIT flag prevents tasks from taking the write lock 2. There's no wake-up of the first task on the xprt->sending queue To address this, clear the congestion wait flag as part of completing a disconnect. Fixes: 75891f50 ("SUNRPC: Support for congestion control ... ") Signed-off-by:
Chuck Lever <chuck.lever@oracle.com> Signed-off-by:
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Trond Myklebust authored
If the copy of the RPC reply into our buffers did not complete, and we could end up with a truncated message. In that case, just resend the call. Fixes: a0584ee9 ("SUNRPC: Use struct xdr_stream when decoding...") Signed-off-by:
Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by:
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Benjamin Coddington authored
Let the name reflect the single use. The function now assumes the GSS MIC is the last object in the buffer. Signed-off-by:
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Benjamin Coddington authored
The GSS Message Integrity Check data for krb5i may lie partially in the XDR reply buffer's pages and tail. If so, we try to copy the entire MIC into free space in the tail. But as the estimations of the slack space required for authentication and verification have improved there may be less free space in the tail to complete this copy -- see commit 2c94b8ec ("SUNRPC: Use au_rslack when computing reply buffer size"). In fact, there may only be room in the tail for a single copy of the MIC, and not part of the MIC and then another complete copy. The real world failure reported is that `ls` of a directory on NFS may sometimes return -EIO, which can be traced back to xdr_buf_read_netobj() failing to find available free space in the tail to copy the MIC. Fix this by checking for the case of the MIC crossing the boundaries of head, pages, and tail. If so, shift the buffer until the MIC is contained completely within the pages or tail. This allows the remainder of the function to create a sub buffer that directly address the complete MIC. Signed-off-by:
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- 17 Sep, 2019 3 commits
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Trond Myklebust authored
Ensure that we set task->tk_rpc_status for all RPC level errors so that the caller can distinguish between those and server reply status errors. Signed-off-by:
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Trond Myklebust authored
If we've removed the request from the receive list, and have added it back after resetting the request receive buffer, then we should only receive message data if it is a new reply (i.e. if transport->recv.copied is zero). Fixes: 277e4ab7 ("SUNRPC: Simplify TCP receive code by switching...") Signed-off-by:
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Trond Myklebust authored
Ensure that we dequeue the request from the transport receive queue while we're re-encoding to prevent issues like use-after-free when we release the bvec. Fixes: 75369089 ("SUNRPC: Ensure the bvecs are reset when we re-encode...") Signed-off-by:
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- 26 Aug, 2019 3 commits
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Chuck Lever authored
Eli Dorfman reports that after a series of idle disconnects, an RPC/RDMA transport becomes unusable (rdma_create_qp returns -ENOMEM). Problem was tracked down to increasing Send Queue size after each reconnect. The rdma_create_qp() API does not promise to leave its @qp_init_attr parameter unaltered. In fact, some drivers do modify one or more of its fields. Thus our calls to rdma_create_qp must use a fresh copy of ib_qp_init_attr each time. This fix is appropriate for kernels dating back to late 2007, though it will have to be adapted, as the connect code has changed over the years. Reported-by:
Eli Dorfman <eli@vastdata.com> Signed-off-by:
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Chuck Lever authored
Ensure that the re-establishment delay does not grow exponentially on each good reconnect. This probably should have been part of commit 675dd90a ("xprtrdma: Modernize ops->connect"). Signed-off-by:
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Chuck Lever authored
The optimization done in "xprtrdma: Simplify rpcrdma_mr_pop" was a bit too optimistic. MRs left over after a reconnect still need to be recycled, not added back to the free list, since they could be in flight or actually fully registered. Signed-off-by:
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- 22 Aug, 2019 6 commits
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Anna Schumaker authored
This removes some code duplication, since both functions were doing the same thing. Signed-off-by: -
Anna Schumaker authored
We need to use the custom rpc_task_setup here to set the RPC_TASK_NO_ROUND_ROBIN flag on the RPC call. Signed-off-by: -
Anna Schumaker authored
An async call followed by an rpc_wait_for_completion() is basically the same as a synchronous call, so we can use nfs4_call_sync_custom() to keep our custom callback ops and the RPC_TASK_NO_ROUND_ROBIN flag. Signed-off-by: -
Anna Schumaker authored
We do this to set the RPC_TASK_NO_ROUND_ROBIN flag in the task_setup structure Signed-off-by: -
Anna Schumaker authored
Rather than running the task manually Signed-off-by: -
Anna Schumaker authored
There are a few cases where we need to manually configure the rpc_task_setup structure to get the behavior we want. Signed-off-by:
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- 21 Aug, 2019 8 commits
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Wenwen Wang authored
In nfs4_try_migration(), if nfs4_begin_drain_session() fails, the previously allocated 'page' and 'locations' are not deallocated, leading to memory leaks. To fix this issue, go to the 'out' label to free 'page' and 'locations' before returning the error. Signed-off-by:
Wenwen Wang <wenwen@cs.uga.edu> Signed-off-by:
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Chuck Lever authored
Micro-optimization: In rpcrdma_post_recvs, since commit e340c2d6 ("xprtrdma: Reduce the doorbell rate (Receive)"), the common case is to return without doing anything. Found with perf. Signed-off-by:
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Chuck Lever authored
Micro-optimization: Save the cost of three function calls during transport header encoding. These were "noinline" before to generate more meaningful call stacks during debugging, but this code is now pretty stable. Signed-off-by:
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Chuck Lever authored
For the moment the returned value just happens to be correct because the current backchannel server implementation does not vary the number of credits it offers. The spec does permit this value to change during the lifetime of a connection, however. The actual maximum is fixed for all RPC/RDMA transports, because each transport instance has to pre-allocate the resources for processing BC requests. That's the value that should be returned. Fixes: 7402a4fe ("SUNRPC: Fix up backchannel slot table ... ") Signed-off-by:
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Chuck Lever authored
Clean up: The function name should match the documenting comment. Signed-off-by:
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Chuck Lever authored
rpcrdma_rep objects are removed from their free list by only a single thread: the Receive completion handler. Thus that free list can be converted to an llist, where a single-threaded consumer and a multi-threaded producer (rpcrdma_buffer_put) can both access the llist without the need for any serialization. This eliminates spin lock contention between the Receive completion handler and rpcrdma_buffer_get, and makes the rep consumer wait- free. Signed-off-by:
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Chuck Lever authored
Clean up: Now that the free list is used sparingly, get rid of the separate spin lock protecting it. Signed-off-by:
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Chuck Lever authored
Instead of a globally-contended MR free list, cache MRs in each rpcrdma_req as they are released. This means acquiring and releasing an MR will be lock-free in the common case, even outside the transport send lock. The original idea of per-rpcrdma_req MR free lists was suggested by Shirley Ma <shirley.ma@oracle.com> several years ago. I just now figured out how to make that idea work with on-demand MR allocation. Signed-off-by:
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- 20 Aug, 2019 14 commits
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Chuck Lever authored
Probably would be good to also pass GFP flags to ib_alloc_mr. Signed-off-by:
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Chuck Lever authored
Refactor: Retrieve an MR and handle error recovery entirely in rpc_rdma.c, as this is not a device-specific function. Note that since commit 89f90fe1 ("SUNRPC: Allow calls to xprt_transmit() to drain the entire transmit queue"), the xprt_transmit function handles the cond_resched. The transport no longer has to do this itself. Signed-off-by:
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Chuck Lever authored
Clean up. There is only one remaining rpcrdma_mr_put call site, and it can be directly replaced with unmap_and_put because mr->mr_dir is set to DMA_NONE just before the call. Now all the call sites do a DMA unmap, and we can just rename mr_unmap_and_put to mr_put, which nicely matches mr_get. Signed-off-by:
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Chuck Lever authored
Clean up: rpcrdma_mr_pop call sites check if the list is empty first. Let's replace the list_empty with less costly logic. Signed-off-by:
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Chuck Lever authored
Commit 48be539d ("xprtrdma: Introduce ->alloc_slot call-out for xprtrdma") added a separate alloc_slot and free_slot to the RPC/RDMA transport. Later, commit 75891f50 ("SUNRPC: Support for congestion control when queuing is enabled") modified the generic alloc/free_slot methods, but neglected the methods in xprtrdma. Found via code review. Fixes: 75891f50 ("SUNRPC: Support for congestion control ... ") Signed-off-by:
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Chuck Lever authored
Clean up: There are other "all" list heads. For code clarity distinguish this one as for use only for MRs by renaming it. Signed-off-by:
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Chuck Lever authored
Make the field name the same for all trace points that handle pointers to struct rpcrdma_rep. That makes it easy to grep for matching rep points in trace output. Signed-off-by:
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Chuck Lever authored
I've heard rumors of an NFS/RDMA server implementation that has a default credit limit of 1024. The client's default setting remains at 128. Signed-off-by:
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Chuck Lever authored
Although I haven't seen any performance results that justify it, I've received several complaints that NFS/RDMA no longer supports a maximum rsize and wsize of 1MB. These days it is somewhat smaller. To simplify the logic that determines whether a chunk list is necessary, the implementation uses a fixed maximum size of the transport header. Currently that maximum size is 256 bytes, one quarter of the default inline threshold size for RPC/RDMA v1. Since commit a7886849 ("xprtrdma: Reduce max_frwr_depth"), the size of chunks is also smaller to take advantage of inline page lists in device internal MR data structures. The combination of these two design choices has reduced the maximum NFS rsize and wsize that can be used for most RNIC/HCAs. Increasing the maximum transport header size and the maximum number of RDMA segments it can contain increases the negotiated maximum rsize/wsize on common RNIC/HCAs. Signed-off-by:
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Chuck Lever authored
Commit 302d3deb ("xprtrdma: Prevent inline overflow") added this calculation back in 2016, but got it wrong. I tested only the lower bound, which is why there is a max_t there. The upper bound should be rounded up too. Now, when using DIV_ROUND_UP, that takes care of the lower bound as well. Signed-off-by:
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Chuck Lever authored
Comment was made obsolete by commit 8cec3dba ("xprtrdma: rpcrdma_regbuf alignment"). Signed-off-by:
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Chuck Lever authored
Things have changed since this comment was written. In particular, the reworking of connection closing, on-demand creation of MRs, and the removal of fr_state all mean that deferring MR recovery to frwr_map is no longer needed. The description is obsolete. Signed-off-by:
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Chuck Lever authored
Micro-optimization: For xdr_commit_encode call sites in net/sunrpc/xdr.c, eliminate the extra calling sequence. On my client, this change saves about a microsecond for every 30 calls to xdr_reserve_space(). Signed-off-by:
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Chuck Lever authored
Clean up: commit c544577d ("SUNRPC: Clean up transport write space handling") appears to have removed the last caller of rpc_wake_up_queued_task_on_wq(). Signed-off-by:
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