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path: root/fs/cifs/smbdirect.c
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2021-06-22smbdirect: missing rc checks while waiting for rdma eventsSteve French1-2/+12
There were two places where we weren't checking for error (e.g. ERESTARTSYS) while waiting for rdma resolution. Addresses-Coverity: 1462165 ("Unchecked return value") Reviewed-by: Tom Talpey <tom@talpey.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-12-13cifs: Fix fall-through warnings for ClangGustavo A. R. Silva1-0/+1
In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple warnings by explicitly adding multiple break/goto statements instead of just letting the code fall through to the next case. Link: https://github.com/KSPP/linux/issues/115 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-06-01cifs: Standardize logging outputJoe Perches1-99/+66
Use pr_fmt to standardize all logging for fs/cifs. Some logging output had no CIFS: specific prefix. Now all output has one of three prefixes: o CIFS: o CIFS: VFS: o Root-CIFS: Miscellanea: o Convert printks to pr_<level> o Neaten macro definitions o Remove embedded CIFS: prefixes from formats o Convert "illegal" to "invalid" o Coalesce formats o Add missing '\n' format terminations o Consolidate multiple cifs_dbg continuations into single calls o More consistent use of upper case first word output logging o Multiline statement argument alignment and wrapping Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-04-07cifs: smbd: Do not schedule work to send immediate packet on every receiveLong Li1-51/+10
Immediate packets should only be sent to peer when there are new receive credits made available. New credits show up on freeing receive buffer, not on receiving data. Fix this by avoid unnenecessary work schedules. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-04-07cifs: smbd: Properly process errors on ib_post_sendLong Li1-123/+97
When processing errors from ib_post_send(), the transport state needs to be rolled back to the condition before the error. Refactor the old code to make it easy to roll back on IB errors, and fix this. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-04-07cifs: smbd: Update receive credits before sending and deal with credits roll ↵Long Li1-7/+18
back on failure before sending Recevie credits should be updated before sending the packet, not before a work is scheduled. Also, the value needs roll back if something fails and cannot send. Signed-off-by: Long Li <longli@microsoft.com> Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-04-07cifs: smbd: Check send queue size before posting a sendLong Li1-1/+10
Sometimes the remote peer may return more send credits than the send queue depth. If all the send credits are used to post senasd, we may overflow the send queue. Fix this by checking the send queue size before posting a send. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-04-07cifs: smbd: Merge code to track pending packetsLong Li1-30/+10
As an optimization, SMBD tries to track two types of packets: packets with payload and without payload. There is no obvious benefit or performance gain to separately track two types of packets. Just treat them as pending packets and merge the tracking code. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-03-29cifs: smbd: Check and extend sender credits in interrupt contextLong Li1-23/+15
When a RDMA packet is received and server is extending send credits, we should check and unblock senders immediately in IRQ context. Doing it in a worker queue causes unnecessary delay and doesn't save much CPU on the receive path. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-03-29cifs: smbd: Calculate the correct maximum packet size for segmented ↵Long Li1-2/+1
SMBDirect send/receive The packet size needs to take account of SMB2 header size and possible encryption header size. This is only done when signing is used and it is for RDMA send/receive, not read/write. Also remove the dead SMBD code in smb2_negotiate_r(w)size. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2019-11-25cifs: smbd: Only queue work for error recovery on memory registrationLong Li1-11/+15
It's not necessary to queue invalidated memory registration to work queue, as all we need to do is to unmap the SG and make it usable again. This can save CPU cycles in normal data paths as memory registration errors are rare and normally only happens during reconnection. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
2019-11-25cifs: smbd: Return -ECONNABORTED when trasnport is not in connected stateLong Li1-1/+1
The transport should return this error so the upper layer will reconnect. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
2019-11-25cifs: smbd: Add messages on RDMA session destroy and reconnectionLong Li1-2/+4
Log these activities to help production support. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
2019-11-25cifs: smbd: Return -EINVAL when the number of iovs exceeds SMBDIRECT_MAX_SGELong Li1-1/+1
While it's not friendly to fail user processes that issue more iovs than we support, at least we should return the correct error code so the user process gets a chance to retry with smaller number of iovs. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com>
2019-08-05rdma: Enable ib_alloc_cq to spread work over a device's comp_vectorsChuck Lever1-4/+6
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 157Thomas Gleixner1-10/+1
Based on 3 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 as published by the free software foundation either version 2 of the license or at your option any later version 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 this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-14cifs:smbd Use the correct DMA direction when sending dataLong Li1-3/+5
When sending data, use the DMA_TO_DEVICE to map buffers. Also log the number of requests in a compounding request from upper layer. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com> Acked-by: Pavel Shilovsky <pshilov@microsoft.com> Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
2019-05-07cifs: smbd: take an array of reqeusts when sending upper layer dataLong Li1-27/+28
To support compounding, __smb_send_rqst() now sends an array of requests to the transport layer. Change smbd_send() to take an array of requests, and send them in as few packets as possible. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
2019-05-07cifs: smbd: Indicate to retry on transport sending failureLong Li1-2/+3
Failure to send a packet doesn't mean it's a permanent failure, it can't be returned to user process. This I/O should be retried or failed based on server packet response and transport health. This logic is handled by the upper layer. Give this decision to upper layer. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2019-05-07cifs: smbd: Return EINTR when interruptedLong Li1-1/+1
When packets are waiting for outbound I/O and interrupted, return the proper error code to user process. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2019-05-07cifs: smbd: Don't destroy transport on RDMA disconnectLong Li1-113/+7
Now upper layer is handling the transport shutdown and reconnect, remove the code that handling transport shutdown on RDMA disconnect. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2019-05-07smbd: Make upper layer decide when to destroy the transportLong Li1-20/+94
On transport recoonect, upper layer CIFS code destroys the current transport and then recoonect. This code path is not used by SMBD, in that SMBD destroys its transport on RDMA disconnect notification independent of CIFS upper layer behavior. This approach adds some costs to SMBD layer to handle transport shutdown and restart, and to deal with several racing conditions on reconnecting transport. Re-work this code path by introducing a new smbd_destroy. This function is called form upper layer to ask SMBD to destroy the transport. SMBD will no longer need to destroy the transport by itself while worrying about data transfer is in progress. The upper layer guarantees the transport is locked. change log: v2: fix build errors when CONFIG_CIFS_SMB_DIRECT is not configured Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2019-03-04cifs: replace snprintf with scnprintfRonnie Sahlberg1-3/+3
a trivial patch that replaces all use of snprintf with scnprintf. scnprintf() is generally seen as a safer function to use than snprintf for many use cases. In our case, there is no actual difference between the two since we never look at the return value. Thus we did not have any of the bugs that scnprintf protects against and the patch does nothing. However, for people reading our code it will be a receipt that we have done our due dilligence and checked our code for this type of bugs. See the presentation "Making C Less Dangerous In The Linux Kernel" at this years LCA Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-12-12RDMA: Start use ib_device_opsKamal Heib1-1/+1
Make all the required change to start use the ib_device_ops structure. Signed-off-by: Kamal Heib <kamalheib1@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-11-01Merge branch 'work.afs' of ↵Linus Torvalds1-4/+13
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull AFS updates from Al Viro: "AFS series, with some iov_iter bits included" * 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (26 commits) missing bits of "iov_iter: Separate type from direction and use accessor functions" afs: Probe multiple fileservers simultaneously afs: Fix callback handling afs: Eliminate the address pointer from the address list cursor afs: Allow dumping of server cursor on operation failure afs: Implement YFS support in the fs client afs: Expand data structure fields to support YFS afs: Get the target vnode in afs_rmdir() and get a callback on it afs: Calc callback expiry in op reply delivery afs: Fix FS.FetchStatus delivery from updating wrong vnode afs: Implement the YFS cache manager service afs: Remove callback details from afs_callback_break struct afs: Commit the status on a new file/dir/symlink afs: Increase to 64-bit volume ID and 96-bit vnode ID for YFS afs: Don't invoke the server to read data beyond EOF afs: Add a couple of tracepoints to log I/O errors afs: Handle EIO from delivery function afs: Fix TTL on VL server and address lists afs: Implement VL server rotation afs: Improve FS server rotation error handling ...
2018-10-23CIFS: SMBD: Do not call ib_dereg_mr on invalidated memory registrationLong Li1-19/+19
It is not necessary to deregister a memory registration after it has been successfully invalidated. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-10-24iov_iter: Use accessor functionDavid Howells1-4/+13
Use accessor functions to access an iterator's type and direction. This allows for the possibility of using some other method of determining the type of iterator than if-chains with bitwise-AND conditions. Signed-off-by: David Howells <dhowells@redhat.com>
2018-08-16Merge tag 'v4.18' into rdma.git for-nextJason Gunthorpe1-15/+7
Resolve merge conflicts from the -rc cycle against the rdma.git tree: Conflicts: drivers/infiniband/core/uverbs_cmd.c - New ifs added to ib_uverbs_ex_create_flow in -rc and for-next - Merge removal of file->ucontext in for-next with new code in -rc drivers/infiniband/core/uverbs_main.c - for-next removed code from ib_uverbs_write() that was modified in for-rc Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-07-24fs/cifs: Simplify ib_post_(send|recv|srq_recv)() callsBart Van Assche1-10/+9
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>
2018-07-05cifs: fix SMB1 breakageRonnie Sahlberg1-2/+3
SMB1 mounting broke in commit 35e2cc1ba755 ("cifs: Use correct packet length in SMB2_TRANSFORM header") Fix it and also rename smb2_rqst_len to smb_rqst_len to make it less unobvious that the function is also called from CIFS/SMB1 Good job by Paulo reviewing and cleaning up Ronnie's original patch. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Reviewed-by: Paulo Alcantara <palcantara@suse.de> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-06-18IB/core: add max_send_sge and max_recv_sge attributesSteve Wise1-3/+10
This patch replaces the ib_device_attr.max_sge with max_send_sge and max_recv_sge. It allows ulps to take advantage of devices that have very different send and recv sge depths. For example cxgb4 has a max_recv_sge of 4, yet a max_send_sge of 16. Splitting out these attributes allows much more efficient use of the SQ for cxgb4 with ulps that use the RDMA_RW API. Consider a large RDMA WRITE that has 16 scattergather entries. With max_sge of 4, the ulp would send 4 WRITE WRs, but with max_sge of 16, it can be done with 1 WRITE WR. Acked-by: Sagi Grimberg <sagi@grimberg.me> Acked-by: Christoph Hellwig <hch@lst.de> Acked-by: Selvin Xavier <selvin.xavier@broadcom.com> Acked-by: Shiraz Saleem <shiraz.saleem@intel.com> Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2018-06-15cifs: Use correct packet length in SMB2_TRANSFORM headerPaulo Alcantara1-14/+5
In smb3_init_transform_rq(), 'orig_len' was only counting the request length, but forgot to count any data pages in the request. Writing or creating files with the 'seal' mount option was broken. In addition, do some code refactoring by exporting smb2_rqst_len() to calculate the appropriate packet size and avoid duplicating the same calculation all over the code. The start of the io vector is either the rfc1002 length (4 bytes) or a SMB2 header which is always > 4. Use this fact to check and skip the rfc1002 length if requested. Signed-off-by: Paulo Alcantara <palcantara@suse.de> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-06-05CIFS: SMBD: Support page offset in memory registrationLong Li1-31/+45
Change code to pass the correct page offset during memory registration for RDMA read/write. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-06-05CIFS: SMBD: Support page offset in RDMA recvLong Li1-7/+11
RDMA recv function needs to place data to the correct place starting at page offset. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-06-05CIFS: SMBD: Support page offset in RDMA sendLong Li1-8/+19
The RDMA send function needs to look at offset in the request pages, and send data starting from there. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2018-04-25cifs: smbd: Avoid allocating iov on the stackLong Li1-24/+12
It's not necessary to allocate another iov when going through the buffers in smbd_send() through RDMA send. Remove it to reduce stack size. Thanks to Matt for spotting a printk typo in the earlier version of this. CC: Matt Redfearn <matt.redfearn@mips.com> Signed-off-by: Long Li <longli@microsoft.com> Acked-by: Ronnie Sahlberg <lsahlber@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <smfrench@gmail.com>
2018-04-20cifs: smbd: Dump SMB packet when configuredLong Li1-1/+5
When sending through SMB Direct, also dump the packet in SMB send path. Also fixed a typo in debug message. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-04-18cifs: smbd: Check for iov length on sending the last iovLong Li1-0/+2
When sending the last iov that breaks into smaller buffers to fit the transfer size, it's necessary to check if this is the last iov. If this is the latest iov, stop and proceed to send pages. Signed-off-by: Long Li <longli@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-04-01cifs: smbd: disconnect transport on RDMA errorsLong Li1-1/+6
On RDMA errors, transport should disconnect the RDMA CM connection. This will notify the upper layer, and it will attempt transport reconnect. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> CC: Stable <stable@vger.kernel.org>
2018-04-01cifs: smbd: avoid reconnect lockupLong Li1-4/+8
During transport reconnect, other processes may have registered memory and blocked on transport. This creates a deadlock situation because the transport resources can't be freed, and reconnect is blocked. Fix this by returning to upper layer on timeout. Before returning, transport status is set to reconnecting so other processes will release memory registration resources. Upper layer will retry the reconnect. This is not in fast I/O path so setting the timeout to 5 seconds. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> CC: Stable <stable@vger.kernel.org>
2018-04-01CIFS: SMBD: fix spelling mistake: "faield" and "legnth"Colin Ian King1-2/+2
Trivial fix to spelling mistake in log_rdma_send and log_rdma_mr message text. Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com>
2018-02-07address lock imbalance warnings in smbdirect.cSteve French1-7/+9
Although at least one of these was an overly strict sparse warning in the new smbdirect code, it is cleaner to fix - so no warnings. Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-26Cleanup some minor endian issues in smb3 rdmaSteve French1-2/+3
Minor cleanup of some sparse warnings (including a few misc endian fixes for the new smb3 rdma code) Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-24CIFS: SMBD: work around gcc -Wmaybe-uninitialized warningArnd Bergmann1-9/+6
GCC versions from 4.9 to 6.3 produce a false-positive warning when dealing with a conditional spin_lock_irqsave(): fs/cifs/smbdirect.c: In function 'smbd_recv_buf': include/linux/spinlock.h:260:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] This function calls some sleeping interfaces, so it is clear that it does not get called with interrupts disabled and there is no need to save the irq state before taking the spinlock. This lets us remove the variable, which makes the function slightly more efficient and avoids the warning. A further cleanup could do the same change for other functions in this file, but I did not want to take this too far for now. Fixes: ac69f66e54ca ("CIFS: SMBD: Implement function to receive data via RDMA receive") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Steve French <smfrench@gmail.com>
2018-01-24CIFS: SMBD: _smbd_get_connection() can be statickbuild test robot1-1/+1
Fixes: 07495ff5d9bc ("CIFS: SMBD: Establish SMB Direct connection") Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Long Li <longli@microsoft.com>
2018-01-24CIFS: SMBD: Implement RDMA memory registrationLong Li1-0/+421
Memory registration is used for transferring payload via RDMA read or write. After I/O is done, memory registrations are recovered and reused. This process can be time consuming and is done in a work queue. Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
2018-01-24CIFS: SMBD: Implement function to send data via RDMA sendLong Li1-0/+246
The transport doesn't maintain send buffers or send queue for transferring payload via RDMA send. There is no data copy in the transport on send. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-24CIFS: SMBD: Implement function to receive data via RDMA receiveLong Li1-0/+228
On the receive path, the transport maintains receive buffers and a reassembly queue for transferring payload via RDMA recv. There is data copy in the transport on recv when it copies the payload to upper layer. The transport recognizes the RFC1002 header length use in the SMB upper layer payloads in CIFS. Because this length is mainly used for TCP and not applicable to RDMA, it is handled as a out-of-band information and is never sent over the wire, and the trasnport behaves like TCP to upper layer by processing and exposing the length correctly on data payloads. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-24CIFS: SMBD: Implement function to destroy a SMB Direct connectionLong Li1-0/+16
Add function to tear down a SMB Direct connection. This is used by upper layer to free all SMB Direct connection and transport resources. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-24CIFS: SMBD: Implement function to reconnect to a SMB Direct transportLong Li1-0/+36
Add function to implement a reconnect to SMB Direct. This involves tearing down the current connection and establishing/negotiating a new connection. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>