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2023-02-249p/rdma: unmap receive dma buffer in rdma_request()/post_recv()Zhengchao Shao
When down_interruptible() or ib_post_send() failed in rdma_request(), receive dma buffer is not unmapped. Add unmap action to error path. Also if ib_post_recv() failed in post_recv(), dma buffer is not unmapped. Add unmap action to error path. Link: https://lkml.kernel.org/r/20230104020424.611926-1-shaozhengchao@huawei.com Fixes: fc79d4b104f0 ("9p: rdma: RDMA Transport Support for 9P") Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com> Reviewed-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
2022-12-139p/client: fix data race on req->statusDominique Martinet
KCSAN reported a race between writing req->status in p9_client_cb and accessing it in p9_client_rpc's wait_event. Accesses to req itself is protected by the data barrier (writing req fields, write barrier, writing status // reading status, read barrier, reading other req fields), but status accesses themselves apparently also must be annotated properly with WRITE_ONCE/READ_ONCE when we access it without locks. Follows: - error paths writing status in various threads all can notify p9_client_rpc, so these all also need WRITE_ONCE - there's a similar read loop in trans_virtio for zc case that also needs READ_ONCE - other reads in trans_fd should be protected by the trans_fd lock and lists state machine, as corresponding writers all are within trans_fd and should be under the same lock. If KCSAN complains on them we likely will have something else to fix as well, so it's better to leave them unmarked and look again if required. Link: https://lkml.kernel.org/r/20221205124756.426350-1-asmadeus@codewreck.org Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Suggested-by: Marco Elver <elver@google.com> Acked-by: Marco Elver <elver@google.com> Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2022-12-029p/net: Remove unneeded idr.h #includeChristophe JAILLET
The 9p net files don't use IDR or IDA functionalities. So there is no point in including <linux/idr.h>. Remove it. Link: https://lkml.kernel.org/r/9e386018601d7e4a9e5d7da8fc3e9555ebb25c87.1669560387.git.christophe.jaillet@wanadoo.fr Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Christian Schoenebeck <linux_oss@crudebyte.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2022-10-05net/9p: add 'pooled_rbuffers' flag to struct p9_trans_moduleChristian Schoenebeck
This is a preparatory change for the subsequent patch: the RDMA transport pulls the buffers for its 9p response messages from a shared pool. [1] So this case has to be considered when choosing an appropriate response message size in the subsequent patch. Link: https://lore.kernel.org/all/Ys3jjg52EIyITPua@codewreck.org/ [1] Link: https://lkml.kernel.org/r/79d24310226bc4eb037892b5c097ec4ad4819a03.1657920926.git.linux_oss@crudebyte.com Signed-off-by: Christian Schoenebeck <linux_oss@crudebyte.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2022-07-099p: Add client parameter to p9_req_put()Kent Overstreet
This is to aid in adding mempools, in the next patch. Link: https://lkml.kernel.org/r/20220704014243.153050-2-kent.overstreet@gmail.com Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2021-11-039p: fix file headersDominique Martinet
- add missing SPDX-License-Identifier - remove (sometimes incorrect) file name from file header Link: http://lkml.kernel.org/r/20211102134608.1588018-2-dominique.martinet@atmark-techno.com Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2021-11-03net/9p: autoload transport modulesThomas Weißschuh
Automatically load transport modules based on the trans= parameter passed to mount. This removes the requirement for the user to know which module to use. Link: http://lkml.kernel.org/r/20211017134611.4330-1-linux@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
2020-11-02net: 9p: Fix kerneldoc warnings of missing parameters etcAndrew Lunn
net/9p/client.c:420: warning: Function parameter or member 'c' not described in 'p9_client_cb' net/9p/client.c:420: warning: Function parameter or member 'req' not described in 'p9_client_cb' net/9p/client.c:420: warning: Function parameter or member 'status' not described in 'p9_client_cb' net/9p/client.c:568: warning: Function parameter or member 'uidata' not described in 'p9_check_zc_errors' net/9p/trans_common.c:23: warning: Function parameter or member 'nr_pages' not described in 'p9_release_pages' net/9p/trans_common.c:23: warning: Function parameter or member 'pages' not described in 'p9_release_pages' net/9p/trans_fd.c:132: warning: Function parameter or member 'rreq' not described in 'p9_conn' net/9p/trans_fd.c:132: warning: Function parameter or member 'wreq' not described in 'p9_conn' net/9p/trans_fd.c:56: warning: Function parameter or member 'privport' not described in 'p9_fd_opts' net/9p/trans_rdma.c:113: warning: Function parameter or member 'cqe' not described in 'p9_rdma_context' net/9p/trans_rdma.c:129: warning: Function parameter or member 'privport' not described in 'p9_rdma_opts' net/9p/trans_virtio.c:215: warning: Function parameter or member 'limit' not described in 'pack_sg_list_p' net/9p/trans_virtio.c:83: warning: Function parameter or member 'chan_list' not described in 'virtio_chan' net/9p/trans_virtio.c:83: warning: Function parameter or member 'p9_max_pages' not described in 'virtio_chan' net/9p/trans_virtio.c:83: warning: Function parameter or member 'ring_bufs_avail' not described in 'virtio_chan' net/9p/trans_virtio.c:83: warning: Function parameter or member 'tag' not described in 'virtio_chan' net/9p/trans_virtio.c:83: warning: Function parameter or member 'vc_wq' not described in 'virtio_chan' Signed-off-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Dominique Martinet <asmadeus@codewreck.org> Link: https://lore.kernel.org/r/20201031182655.1082065-1-andrew@lunn.ch Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-07-13net: 9p: kerneldoc fixesAndrew Lunn
Simple fixes which require no deep knowledge of the code. Cc: Eric Van Hensbergen <ericvh@gmail.com> Cc: Latchesar Ionkov <lucho@ionkov.net> Cc: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2019-08-05rdma: Enable ib_alloc_cq to spread work over a device's comp_vectorsChuck Lever
Send and Receive completion is handled on a single CPU selected at the time each Completion Queue is allocated. Typically this is when an initiator instantiates an RDMA transport, or when a target accepts an RDMA connection. Some ULPs cannot open a connection per CPU to spread completion workload across available CPUs and MSI vectors. For such ULPs, provide an API that allows the RDMA core to select a completion vector based on the device's complement of available comp_vecs. ULPs that invoke ib_alloc_cq() with only comp_vector 0 are converted to use the new API so that their completion workloads interfere less with each other. Suggested-by: Håkon Bugge <haakon.bugge@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Cc: <linux-cifs@vger.kernel.org> Cc: <v9fs-developer@lists.sourceforge.net> Link: https://lore.kernel.org/r/20190729171923.13428.52555.stgit@manet.1015granger.net Signed-off-by: Doug Ledford <dledford@redhat.com>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 188Thomas Gleixner
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to free software foundation 51 franklin street fifth floor boston ma 02111 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 27 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528170026.981318839@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-089p/rdma: remove useless check in cm_event_handlerDominique Martinet
the client c is always dereferenced to get the rdma struct, so c has to be a valid pointer at this point. Gcc would optimize that away but let's make coverity happy... Link: http://lkml.kernel.org/r/1536339057-21974-3-git-send-email-asmadeus@codewreck.org Addresses-Coverity-ID: 102778 ("Dereference before null check") Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
2018-09-089p/rdma: do not disconnect on down_interruptible EAGAINDominique Martinet
9p/rdma would sometimes drop the connection and display errors in recv_done when the user does ^C. The errors were caused by recv buffers that were posted at the time of disconnect, and we just do not want to disconnect when down_interruptible is... interrupted. Link: http://lkml.kernel.org/r/1535625307-18019-1-git-send-email-asmadeus@codewreck.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
2018-09-089p: Add refcount to p9_req_tTomas Bortoli
To avoid use-after-free(s), use a refcount to keep track of the usable references to any instantiated struct p9_req_t. This commit adds p9_req_put(), p9_req_get() and p9_req_try_get() as wrappers to kref_put(), kref_get() and kref_get_unless_zero(). These are used by the client and the transports to keep track of valid requests' references. p9_free_req() is added back and used as callback by kref_put(). Add SLAB_TYPESAFE_BY_RCU as it ensures that the memory freed by kmem_cache_free() will not be reused for another type until the rcu synchronisation period is over, so an address gotten under rcu read lock is safe to inc_ref() without corrupting random memory while the lock is held. Link: http://lkml.kernel.org/r/1535626341-20693-1-git-send-email-asmadeus@codewreck.org Co-developed-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com> Reported-by: syzbot+467050c1ce275af2a5b8@syzkaller.appspotmail.com Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
2018-09-089p: embed fcall in req to round down buffer allocsDominique Martinet
'msize' is often a power of two, or at least page-aligned, so avoiding an overhead of two dozen bytes for each allocation will help the allocator do its work and reduce memory fragmentation. Link: http://lkml.kernel.org/r/1533825236-22896-1-git-send-email-asmadeus@codewreck.org Suggested-by: Matthew Wilcox <willy@infradead.org> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Jun Piao <piaojun@huawei.com> Cc: Matthew Wilcox <willy@infradead.org>
2018-08-17Merge tag '9p-for-4.19-2' of git://github.com/martinetd/linuxLinus Torvalds
Pull 9p updates from Dominique Martinet: "This contains mostly fixes (6 to be backported to stable) and a few changes, here is the breakdown: - rework how fids are attributed by replacing some custom tracking in a list by an idr - for packet-based transports (virtio/rdma) validate that the packet length matches what the header says - a few race condition fixes found by syzkaller - missing argument check when NULL device is passed in sys_mount - a few virtio fixes - some spelling and style fixes" * tag '9p-for-4.19-2' of git://github.com/martinetd/linux: (21 commits) net/9p/trans_virtio.c: add null terminal for mount tag 9p/virtio: fix off-by-one error in sg list bounds check 9p: fix whitespace issues 9p: fix multiple NULL-pointer-dereferences fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed 9p: validate PDU length net/9p/trans_fd.c: fix race by holding the lock net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree() net/9p/virtio: Fix hard lockup in req_done net/9p/trans_virtio.c: fix some spell mistakes in comments 9p/net: Fix zero-copy path in the 9p virtio transport 9p: Embed wait_queue_head into p9_req_t 9p: Replace the fidlist with an IDR 9p: Change p9_fid_create calling convention 9p: Fix comment on smp_wmb net/9p/client.c: version pointer uninitialized fs/9p/v9fs.c: fix spelling mistake "Uknown" -> "Unknown" net/9p: fix error path of p9_virtio_probe 9p/net/protocol.c: return -ENOMEM when kmalloc() failed net/9p/client.c: add missing '\n' at the end of p9_debug() ...
2018-08-139p: fix multiple NULL-pointer-dereferencesTomas Bortoli
Added checks to prevent GPFs from raising. Link: http://lkml.kernel.org/r/20180727110558.5479-1-tomasbortoli@gmail.com Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com> Reported-by: syzbot+1a262da37d3bead15c39@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
2018-08-139p: validate PDU lengthTomas Bortoli
This commit adds length check for the PDU size. The size contained in the header has to match the actual size, except for TCP (trans_fd.c) where actual length is not known ahead and the header's length will be checked only against the validity range. Link: http://lkml.kernel.org/r/20180723154404.2406-1-tomasbortoli@gmail.com Signed-off-by: Tomas Bortoli <tomasbortoli@gmail.com> Reported-by: syzbot+65c6b72f284a39d416b4@syzkaller.appspotmail.com To: Eric Van Hensbergen <ericvh@gmail.com> To: Ron Minnich <rminnich@sandia.gov> To: Latchesar Ionkov <lucho@ionkov.net> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
2018-07-24net/9p: Simplify ib_post_(send|recv|srq_recv)() callsBart Van Assche
Instead of declaring and passing a dummy 'bad_wr' pointer, pass NULL as third argument to ib_post_(send|recv|srq_recv)(). Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-05-10net/9p: correct some comment errors in 9p file system codeSun Lianwen
There are follow comment errors: 1 The function name is wrong in p9_release_pages() comment. 2 The function name and variable name is wrong in p9_poll_workfn() comment. 3 There is no variable dm_mr and lkey in struct p9_trans_rdma. 4 The function name is wrong in rdma_create_trans() comment. 5 There is no variable initialized in struct virtio_chan. 6 The variable name is wrong in p9_virtio_zc_request() comment. Signed-off-by: Sun Lianwen <sunlw.fnst@cn.fujitsu.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-119p: Implement show_optionsDavid Howells
Implement the show_options superblock op for 9p as part of a bid to get rid of s_options and generic_show_options() to make it easier to implement a context-based mount where the mount options can be passed individually over a file descriptor. Signed-off-by: David Howells <dhowells@redhat.com> cc: Eric Van Hensbergen <ericvh@gmail.com> cc: Ron Minnich <rminnich@sandia.gov> cc: Latchesar Ionkov <lucho@ionkov.net> cc: v9fs-developer@lists.sourceforge.net Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-23IB/core: add support to create a unsafe global rkey to ib_create_pdChristoph Hellwig
Instead of exposing ib_get_dma_mr to ULPs and letting them use it more or less unchecked, this moves the capability of creating a global rkey into the RDMA core, where it can be easily audited. It also prints a warning everytime this feature is used as well. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2016-03-10net/9p: convert to new CQ APIChristoph Hellwig
Trivial conversion to the new RDMA CQ API. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-10-28IB/cma: Add support for network namespacesGuy Shapiro
Add support for network namespaces in the ib_cma module. This is accomplished by: 1. Adding network namespace parameter for rdma_create_id. This parameter is used to populate the network namespace field in rdma_id_private. rdma_create_id keeps a reference on the network namespace. 2. Using the network namespace from the rdma_id instead of init_net inside of ib_cma, when listening on an ID and when looking for an ID for an incoming request. 3. Decrementing the reference count for the appropriate network namespace when calling rdma_destroy_id. In order to preserve the current behavior init_net is passed when calling from other modules. Signed-off-by: Guy Shapiro <guysh@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Yotam Kenneth <yotamke@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-08-30net/9p: Remove ib_get_dma_mr callsJason Gunthorpe
The pd now has a local_dma_lkey member which completely replaces ib_get_dma_mr, use it instead. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Tested-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-06-12IB/core: Change ib_create_cq to use struct ib_cq_init_attrMatan Barak
Currently, ib_create_cq uses cqe and comp_vecotr instead of the extendible ib_cq_init_attr struct. Earlier patches already changed the vendors to work with ib_cq_init_attr. This patch changes the consumers too. Signed-off-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
2015-03-21net/9p: add a privport option for RDMA transport.Dominique Martinet
RDMA can use the same kind of weak security as TCP by checking the client can bind to a privileged port, which is better than nothing if TAUTH isn't implemented. Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259pnet_rdma: check token type before int conversionSimon Derr
When parsing options, make sure we have found a proper token before doing a numeric conversion. Without this check, the current code will end up following random pointers that just happened to be on the stack when this function was called, because match_token() will not touch the 'args' list unless a valid token is found. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259pnet_rdma: add cancelled()Simon Derr
Take into account posted recv buffers that will never receive their reply. The RDMA code posts a recv buffer for each request that it sends. When a request is flushed, it is possible that this request will never receive a reply, and that one recv buffer will stay unused on the recv queue. It is then possible, if this scenario happens several times, to have the recv queue full, and have the 9pnet_rmda module unable to send new requests. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259pnet_rdma: update request status during sendSimon Derr
This will be needed by the flush logic. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2014-03-259P: Add memory barriers to protect request fields over cb/rpc threads handoffDominique Martinet
We need barriers to guarantee this pattern works as intended: [w] req->rc, 1 [r] req->status, 1 wmb rmb [w] req->status, 1 [r] req->rc Where the wmb ensures that rc gets written before status, and the rmb ensures that if you observe status == 1, rc is the new value. Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-24net: trans_rdma: remove unused functionAndi Shyti
This patch gets rid of the following warning: net/9p/trans_rdma.c:594:12: warning: ‘rdma_cancelled’ defined but not used [-Wunused-function] static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req) The rdma_cancelled function is not called anywhere in the kernel Signed-off-by: Andi Shyti <andi@etezian.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-07-079P: Add cancelled() to the transport functions.Simon Derr
RDMA needs to post a buffer for each incoming reply. Hence it needs to keep count of these and needs to be aware of whether a flushed request has received a reply or not. This patch adds the cancelled() callback to the transport modules. It is called when RFLUSH has been received and that the corresponding request will never receive a reply. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: count posted buffers without a pending requestSimon Derr
In rdma_request(): If an error occurs between posting the recv and the send, there will be a reply context posted without a pending request. Since there is no way to "un-post" it, we remember it and skip post_recv() for the next request. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: Improve error handling in rdma_requestSimon Derr
Most importantly: - do not free the recv context (rpl_context) after a successful post_recv() - but do free the send context (c) after a failed send. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: Do not free req->rc in error handling in rdma_request()Simon Derr
rdma_request() should never be in charge of freeing rc. When an error occurs: * Either the rc buffer has been recv_post()'ed. then kfree()'ing it certainly is a bad idea. * Or is has not, and in that case req->rc still points to it, hence it needs not be freed. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: Use a semaphore to protect the RQSimon Derr
The current code keeps track of the number of buffers posted in the RQ, and will prevent it from overflowing. But it does so by simply dropping post requests (And leaking memory in the process). When this happens there will actually be too few buffers posted, and soon the 9P server will complain about 'RNR retry counter exceeded' errors. Instead, use a semaphore, and block until the RQ is ready for another buffer to be posted. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: Protect against duplicate repliesSimon Derr
A well-behaved server would not send twice the reply to a request. But if it ever happens... This additional check prevents the kernel from leaking memory and possibly more nasty consequences in that unlikely event. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: increase P9_RDMA_MAXSIZE to 1MBSimon Derr
The current value is too low to get good performance. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2013-07-079P/RDMA: rdma_request() needs not allocate req->rcSimon Derr
p9_tag_alloc() takes care of that. Signed-off-by: Simon Derr <simon.derr@bull.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2012-01-059p: Reduce object size with CONFIG_NET_9P_DEBUGJoe Perches
Reduce object size by deduplicating formats. Use vsprintf extension %pV. Rename P9_DPRINTK uses to p9_debug, align arguments. Add function for _p9_debug and macro to add __func__. Add missing "\n"s to p9_debug uses. Remove embedded function names as p9_debug adds it. Remove P9_EPRINTK macro and convert use to pr_<level>. Add and use pr_fmt and pr_<level>. $ size fs/9p/built-in.o* text data bss dec hex filename 62133 984 16000 79117 1350d fs/9p/built-in.o.new 67342 984 16928 85254 14d06 fs/9p/built-in.o.old $ size net/9p/built-in.o* text data bss dec hex filename 88792 4148 22024 114964 1c114 net/9p/built-in.o.new 94072 4148 23232 121452 1da6c net/9p/built-in.o.old Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-05-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: RDMA/cma: Save PID of ID's owner RDMA/cma: Add support for netlink statistics export RDMA/cma: Pass QP type into rdma_create_id() RDMA: Update exported headers list RDMA/cma: Export enum cma_state in <rdma/rdma_cm.h> RDMA/nes: Add a check for strict_strtoul() RDMA/cxgb3: Don't post zero-byte read if endpoint is going away RDMA/cxgb4: Use completion objects for event blocking IB/srp: Fix integer -> pointer cast warnings IB: Add devnode methods to cm_class and umad_class IB/mad: Return EPROTONOSUPPORT when an RDMA device lacks the QP required IB/uverbs: Add devnode method to set path/mode RDMA/ucma: Add .nodename/.mode to tell userspace where to create device node RDMA: Add netlink infrastructure RDMA: Add error handling to ib_core_init()
2011-05-25RDMA/cma: Pass QP type into rdma_create_id()Sean Hefty
The RDMA CM currently infers the QP type from the port space selected by the user. In the future (eg with RDMA_PS_IB or XRC), there may not be a 1-1 correspondence between port space and QP type. For netlink export of RDMA CM state, we want to export the QP type to userspace, so it is cleaner to explicitly associate a QP type to an ID. Modify rdma_create_id() to allow the user to specify the QP type, and use it to make our selections of datagram versus connected mode. Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
2011-05-199p: Kill unused variable 'ret' in trans_rdma.c:parse_opts()David S. Miller
Probably just cut and pasted from the other parse_opts() implementations in the 9p sources. Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-22net/9p: Convert the in the 9p rpc call path to GFP_NOFSAneesh Kumar K.V
Without this we can cause reclaim allocation in writepage. [ 3433.448430] ================================= [ 3433.449117] [ INFO: inconsistent lock state ] [ 3433.449117] 2.6.38-rc5+ #84 [ 3433.449117] --------------------------------- [ 3433.449117] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-R} usage. [ 3433.449117] kswapd0/505 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 3433.449117] (iprune_sem){+++++-}, at: [<ffffffff810ebbab>] shrink_icache_memory+0x45/0x2b1 [ 3433.449117] {RECLAIM_FS-ON-W} state was registered at: [ 3433.449117] [<ffffffff8107fe5f>] mark_held_locks+0x52/0x70 [ 3433.449117] [<ffffffff8107ff02>] lockdep_trace_alloc+0x85/0x9f [ 3433.449117] [<ffffffff810d353d>] slab_pre_alloc_hook+0x18/0x3c [ 3433.449117] [<ffffffff810d3fd5>] kmem_cache_alloc+0x23/0xa2 [ 3433.449117] [<ffffffff8127be77>] idr_pre_get+0x2d/0x6f [ 3433.449117] [<ffffffff815434eb>] p9_idpool_get+0x30/0xae [ 3433.449117] [<ffffffff81540123>] p9_client_rpc+0xd7/0x9b0 [ 3433.449117] [<ffffffff815427b0>] p9_client_clunk+0x88/0xdb [ 3433.449117] [<ffffffff811d56e5>] v9fs_evict_inode+0x3c/0x48 [ 3433.449117] [<ffffffff810eb511>] evict+0x1f/0x87 [ 3433.449117] [<ffffffff810eb5c0>] dispose_list+0x47/0xe3 [ 3433.449117] [<ffffffff810eb8da>] evict_inodes+0x138/0x14f [ 3433.449117] [<ffffffff810d90e2>] generic_shutdown_super+0x57/0xe8 [ 3433.449117] [<ffffffff810d91e8>] kill_anon_super+0x11/0x50 [ 3433.449117] [<ffffffff811d4951>] v9fs_kill_super+0x49/0xab [ 3433.449117] [<ffffffff810d926e>] deactivate_locked_super+0x21/0x46 [ 3433.449117] [<ffffffff810d9e84>] deactivate_super+0x40/0x44 [ 3433.449117] [<ffffffff810ef848>] mntput_no_expire+0x100/0x109 [ 3433.449117] [<ffffffff810f0aeb>] sys_umount+0x2f1/0x31c [ 3433.449117] [<ffffffff8102c87b>] system_call_fastpath+0x16/0x1b [ 3433.449117] irq event stamp: 192941 [ 3433.449117] hardirqs last enabled at (192941): [<ffffffff81568dcf>] _raw_spin_unlock_irq+0x2b/0x30 [ 3433.449117] hardirqs last disabled at (192940): [<ffffffff810b5f97>] shrink_inactive_list+0x290/0x2f5 [ 3433.449117] softirqs last enabled at (188470): [<ffffffff8105fd65>] __do_softirq+0x133/0x152 [ 3433.449117] softirqs last disabled at (188455): [<ffffffff8102d7cc>] call_softirq+0x1c/0x28 [ 3433.449117] [ 3433.449117] other info that might help us debug this: [ 3433.449117] 1 lock held by kswapd0/505: [ 3433.449117] #0: (shrinker_rwsem){++++..}, at: [<ffffffff810b52e2>] shrink_slab+0x38/0x15f [ 3433.449117] [ 3433.449117] stack backtrace: [ 3433.449117] Pid: 505, comm: kswapd0 Not tainted 2.6.38-rc5+ #84 [ 3433.449117] Call Trace: [ 3433.449117] [<ffffffff8107fbce>] ? valid_state+0x17e/0x191 [ 3433.449117] [<ffffffff81036896>] ? save_stack_trace+0x28/0x45 [ 3433.449117] [<ffffffff81080426>] ? check_usage_forwards+0x0/0x87 [ 3433.449117] [<ffffffff8107fcf4>] ? mark_lock+0x113/0x22c [ 3433.449117] [<ffffffff8108105f>] ? __lock_acquire+0x37a/0xcf7 [ 3433.449117] [<ffffffff8107fc0e>] ? mark_lock+0x2d/0x22c [ 3433.449117] [<ffffffff81081077>] ? __lock_acquire+0x392/0xcf7 [ 3433.449117] [<ffffffff810b14d2>] ? determine_dirtyable_memory+0x15/0x28 [ 3433.449117] [<ffffffff81081a33>] ? lock_acquire+0x57/0x6d [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff81567d85>] ? down_read+0x47/0x5c [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810b5385>] ? shrink_slab+0xdb/0x15f [ 3433.449117] [<ffffffff810b69bc>] ? kswapd+0x574/0x96a [ 3433.449117] [<ffffffff810b6448>] ? kswapd+0x0/0x96a [ 3433.449117] [<ffffffff810714e2>] ? kthread+0x7d/0x85 [ 3433.449117] [<ffffffff8102d6d4>] ? kernel_thread_helper+0x4/0x10 [ 3433.449117] [<ffffffff81569200>] ? restore_args+0x0/0x30 [ 3433.449117] [<ffffffff81071465>] ? kthread+0x0/0x85 [ 3433.449117] [<ffffffff8102d6d0>] ? kernel_thread_helper+0x0/0x10 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2011-01-19net: cleanup unused macros in net directoryShan Wei
Clean up some unused macros in net/*. 1. be left for code change. e.g. PGV_FROM_VMALLOC, PGV_FROM_VMALLOC, KMEM_SAFETYZONE. 2. never be used since introduced to kernel. e.g. P9_RDMA_MAX_SGE, UTIL_CTRL_PKT_SIZE. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: Sjur Braendeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-27net/9p: fix memory handling/allocation in rdma_request()Davidlohr Bueso
Return -ENOMEM when erroring on kmalloc and fix memory leaks when returning on error. Signed-off-by: Davidlohr Bueso <dave@gnu.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
2010-05-17net: Remove unnecessary returns from void function()sJoe Perches
This patch removes from net/ (but not any netfilter files) all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo
implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-02-089p: fix option parsingEric Van Hensbergen
Options pointer is being moved before calling kfree() which seems to cause problems. This uses a separate pointer to track and free original allocation. Signed-off-by: Venkateswararao Jujjuri <jvrao@us.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>w
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