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path: root/include/linux/sunrpc/svc_rdma.h
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2008-08-13svcrdma: Fix race between svc_rdma_recvfrom thread and the dto_taskletTom Tucker
RDMA_READ completions are kept on a separate queue from the general I/O request queue. Since a separate lock is used to protect the RDMA_READ completion queue, a race exists between the dto_tasklet and the svc_rdma_recvfrom thread where the dto_tasklet sets the XPT_DATA bit and adds I/O to the read-completion queue. Concurrently, the recvfrom thread checks the generic queue, finds it empty and resets the XPT_DATA bit. A subsequent svc_xprt_enqueue will fail to enqueue the transport for I/O and cause the transport to "stall". The fix is to protect both lists with the same lock and set the XPT_DATA bit with this lock held. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-07-02svcrdma: Change WR context get/put to use the kmem cacheTom Tucker
Change the WR context pool to be shared across mount points. This reduces the RDMA transport memory footprint significantly since idle mounts don't consume WR context memory. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-07-02svcrdma: Remove unused wait q from svcrdma_xprt structureTom Tucker
The sc_read_wait queue head is no longer used. Remove it. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-07-02svcrdma: Add dma map count and WARN_ONTom Tucker
Add a dma map count in order to verify that all DMA mapping resources have been freed when the transport is closed. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-07-02svcrdma: Use reply and chunk map for RDMA_READ processingTom Tucker
Modify the RDMA_READ processing to use the reply and chunk list mapping data types. Also add a special purpose 'hdr_count' field in in the context to hold the header page count instead of overloading the SGE length field and corrupting the DMA map length. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-07-02svcrdma: Add a type for keeping NFS RPC mappingTom Tucker
Create a new data structure to hold the remote client address space to local server address space mapping. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-19svcrdma: Change svc_rdma_send_error return type to voidTom Tucker
The svc_rdma_send_error function is called when an RPCRDMA protocol error is detected. This function attempts to post an error reply message. Since an error posting to a transport in error is ignored, change the return type to void. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-19svcrdma: Move destroy to kernel threadTom Tucker
Some providers may wait while destroying adapter resources. Since it is possible that the last reference is put on the dto_tasklet, the actual destroy must be scheduled as a work item. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-19svcrdma: Use standard Linux lists for context cacheTom Tucker
Replace the one-off linked list implementation used to implement the context cache with the standard Linux list_head lists. Add a context counter to catch resource leaks. A WARN_ON will be added later to ensure that we've freed all contexts. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-19svcrdma: Simplify RDMA_READ deferral buffer managementTom Tucker
An NFS_WRITE requires a set of RDMA_READ requests to fetch the write data from the client. There are two principal pieces of data that need to be tracked: the list of pages that comprise the completed RPC and the SGE of dma mapped pages to refer to this list of pages. Previously this whole bit was managed as a linked list of contexts with the context containing the page list buried in this list. This patch simplifies this processing by not keeping a linked list, but rather only a pionter from the last submitted RDMA_READ's context to the context that maps the set of pages that describe the RPC. This significantly simplifies this code path. SGE contexts are cleaned up inline in the DTO path instead of at read completion time. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-05-19svcrdma: Remove unused READ_DONE context flags bitTom Tucker
The RDMACTXT_F_READ_DONE bit is not longer used. Remove it. Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
2008-02-01rdma: SVCRMDA Header FileTom Tucker
This file defines the data types used by the SVCRDMA transport module. The principle data structure is the transport specific extension to the svcxprt structure. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>