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path: root/fs/cifs/smbdirect.h
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2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157Thomas Gleixner
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>
2019-05-07cifs: smbd: take an array of reqeusts when sending upper layer dataLong Li
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: Don't destroy transport on RDMA disconnectLong Li
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 Li
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>
2018-07-05cifs: fix SMB1 breakageRonnie Sahlberg
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>
2018-06-05CIFS: SMBD: Support page offset in memory registrationLong Li
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>
2018-01-26move a few externs to smbdirect.h to eliminate warningSteve French
Quiet minor sparse warnings in new SMB3 rdma patch series ("symbol was not declared ...") by moving these externs to smbdirect.h Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
2018-01-24CIFS: SMBD: Implement RDMA memory registrationLong Li
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 Li
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 Li
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 Li
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 Li
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>
2018-01-24CIFS: SMBD: Implement function to create a SMB Direct connectionLong Li
The upper layer calls this function to connect to peer through SMB Direct. Each SMB Direct connection is based on a RDMA RC Queue Pair. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2018-01-24CIFS: SMBD: Establish SMB Direct connectionLong Li
Add code to implement the core functions to establish a SMB Direct connection. 1. Establish an RDMA connection to SMB server. 2. Negotiate and setup SMB Direct protocol. 3. Implement idle connection timer and credit management. SMB Direct is enabled by setting CONFIG_CIFS_SMB_DIRECT. Add to Makefile to enable building SMB Direct. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
2018-01-24CIFS: SMBD: Add SMB Direct protocol initial values and constantsLong Li
To prepare for protocol implementation, add constants and user-configurable values for the SMB Direct protocol. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Acked-by: Ronnie Sahlberg <lsahlber.redhat.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>