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2020-10-26scsi: fc: Update formal FPIN descriptor definitionsShyam Sundar
Add Fabric Performance Impact Notification (FPIN) descriptor definitions for the following FPINs: - Delivery Notification Descriptor - Peer Congestion Notification Descriptor - Congestion Notification Descriptor Link: https://lore.kernel.org/r/20201021092715.22669-2-njavali@marvell.com Reviewed-by: James Smart <james.smart@broadcom.com> Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Shyam Sundar <ssundar@marvell.com> Signed-off-by: Nilesh Javali <njavali@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-07-01scsi: qla2xxx: Change in PUREX to handle FPIN ELS requestsShyam Sundar
SAN Congestion Management generates ELS pkts whose size can vary and be > 64 bytes. Change the PUREX handling code to support non-standard ELS pkt size. Link: https://lore.kernel.org/r/20200630102229.29660-2-njavali@marvell.com Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Shyam Sundar <ssundar@marvell.com> Signed-off-by: Arun Easi <aeasi@marvell.com> Signed-off-by: Nilesh Javali <njavali@marvell.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-05-04uapi: revert flexible-array conversionsGustavo A. R. Silva
These structures can get embedded in other structures in user-space and cause all sorts of warnings and problems. So, we better don't take any chances and keep the zero-length arrays in place for now. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
2020-03-11scsi: Replace zero-length array with flexible-array memberGustavo A. R. Silva
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Link: https://lore.kernel.org/r/20200224161406.GA21454@embeddedor Reviewed-by: Lee Duncan <lduncan@suse.com> Reviewed-by: Satish Kharat <satishkh@cisco.com> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-02-18scsi: fc: Update Descriptor definition and add RDF and Link Integrity FPINsJames Smart
Update the FC headers for the RDF ELS and populate out the FPIN ELS and the Link integrity FPIN payload. RDF is used to register for diagnostic events. FPIN is how the fabric reports a diagnostic event. Specifically, this patch: - Adds the formal definition of TLV descriptors that are now used in a lot of the FC spec. The simplistic fc_fn_desc structure, basically no more than the tlv definition, is removed. - Small tlv helper functions are added as defines. - The list of known Descriptor tags (identifying the TLV) is expanded and a name initializer introduced. - The LSRI descriptor, returned in many new ELS response payloads is added. - The RDF ELS code is added, and the RDF request response structures added. - The FPIN els definition is corrected. - A full definition of a Link Integrity Notification descriptor is added, [mkp: rolled in kbuild warning fix] Link: https://lore.kernel.org/r/20200210173155.547-2-jsmart2021@gmail.com Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-12-19scsi: ufs: delete unused structure filed trBean Huo
Delete unused structure field tr in structure utp_upiu_req, since no person uses it for task management. Fixes: df032bf27a41 ("scsi: ufs: Add a bsg endpoint that supports UPIUs") Link: https://lore.kernel.org/r/20191205220912.5696-1-huobean@gmail.com Reviewed-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-08-12scsi: use __u{8,16,32,64} instead of uint{8,16,32,64}_t in uapi headersMasahiro Yamada
When CONFIG_UAPI_HEADER_TEST=y, exported headers are compile-tested to make sure they can be included from user-space. Currently, scsi_bsg_fc.h, scsi_netlink.h, and scsi_netlink_fc.h are excluded from the test coverage. To make them join the compile-test, we need to fix the build errors attached below. For a case like this, we decided to use __u{8,16,32,64} variable types in this discussion: https://lkml.org/lkml/2019/6/5/18 Build log: CC usr/include/scsi/scsi_netlink_fc.h.s CC usr/include/scsi/scsi_netlink.h.s CC usr/include/scsi/scsi_bsg_fc.h.s In file included from ./usr/include/scsi/scsi_netlink_fc.h:10:0, from <command-line>:32: ./usr/include/scsi/scsi_netlink.h:29:2: error: unknown type name uint8_t uint8_t version; ^~~~~~~ ./usr/include/scsi/scsi_netlink.h:30:2: error: unknown type name uint8_t uint8_t transport; ^~~~~~~ ./usr/include/scsi/scsi_netlink.h:31:2: error: unknown type name uint16_t uint16_t magic; ^~~~~~~~ ./usr/include/scsi/scsi_netlink.h:32:2: error: unknown type name uint16_t uint16_t msgtype; ^~~~~~~~ CC usr/include/rdma/vmw_pvrdma-abi.h.s ./usr/include/scsi/scsi_netlink.h:33:2: error: unknown type name uint16_t uint16_t msglen; ^~~~~~~~ ./usr/include/scsi/scsi_netlink.h:34:33: error: uint64_t undeclared here (not in a function); did you mean __uint128_t ? } __attribute__((aligned(sizeof(uint64_t)))); ^~~~~~~~ __uint128_t ./usr/include/scsi/scsi_netlink.h:78:2: error: expected specifier-qualifier-list before uint64_t uint64_t vendor_id; ^~~~~~~~ In file included from <command-line>:32:0: ./usr/include/scsi/scsi_netlink_fc.h:46:2: error: expected specifier-qualifier-list before uint64_t uint64_t seconds; ^~~~~~~~ make[2]: *** [scripts/Makefile.build;302: usr/include/scsi/scsi_netlink_fc.h.s] Error 1 make[2]: *** Waiting for unfinished jobs.... In file included from <command-line>:32:0: ./usr/include/scsi/scsi_netlink.h:29:2: error: unknown type name uint8_t uint8_t version; ^~~~~~~ ./usr/include/scsi/scsi_netlink.h:30:2: error: unknown type name uint8_t uint8_t transport; ^~~~~~~ ./usr/include/scsi/scsi_netlink.h:31:2: error: unknown type name uint16_t uint16_t magic; ^~~~~~~~ ./usr/include/scsi/scsi_netlink.h:32:2: error: unknown type name uint16_t uint16_t msgtype; ^~~~~~~~ ./usr/include/scsi/scsi_netlink.h:33:2: error: unknown type name uint16_t uint16_t msglen; ^~~~~~~~ ./usr/include/scsi/scsi_netlink.h:34:33: error: uint64_t undeclared here (not in a function); did you mean __uint128_t ? } __attribute__((aligned(sizeof(uint64_t)))); ^~~~~~~~ __uint128_t ./usr/include/scsi/scsi_netlink.h:78:2: error: expected specifier-qualifier-list before uint64_t uint64_t vendor_id; ^~~~~~~~ make[2]: *** [scripts/Makefile.build;302: usr/include/scsi/scsi_netlink.h.s] Error 1 In file included from <command-line>:32:0: ./usr/include/scsi/scsi_bsg_fc.h:69:2: error: unknown type name uint8_t uint8_t reserved; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:72:2: error: unknown type name uint8_t uint8_t port_id[3]; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:90:2: error: unknown type name uint8_t uint8_t reserved; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:93:2: error: unknown type name uint8_t uint8_t port_id[3]; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:114:2: error: unknown type name uint8_t uint8_t command_code; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:117:2: error: unknown type name uint8_t uint8_t port_id[3]; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:154:2: error: unknown type name uint32_t uint32_t status; /* See FC_CTELS_STATUS_xxx */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:158:3: error: unknown type name uint8_t uint8_t action; /* fragment_id for CT REJECT */ ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:159:3: error: unknown type name uint8_t uint8_t reason_code; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:160:3: error: unknown type name uint8_t uint8_t reason_explanation; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:161:3: error: unknown type name uint8_t uint8_t vendor_unique; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:177:2: error: unknown type name uint8_t uint8_t reserved; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:180:2: error: unknown type name uint8_t uint8_t port_id[3]; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:185:2: error: unknown type name uint32_t uint32_t preamble_word0; /* revision & IN_ID */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:186:2: error: unknown type name uint32_t uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:187:2: error: unknown type name uint32_t uint32_t preamble_word2; /* Cmd Code, Max Size */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:207:2: error: unknown type name uint64_t uint64_t vendor_id; ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:210:2: error: unknown type name uint32_t uint32_t vendor_cmd[0]; ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:217:2: error: unknown type name uint32_t uint32_t vendor_rsp[0]; ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:236:2: error: unknown type name uint8_t uint8_t els_code; ^~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:254:2: error: unknown type name uint32_t uint32_t preamble_word0; /* revision & IN_ID */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:255:2: error: unknown type name uint32_t uint32_t preamble_word1; /* GS_Type, GS_SubType, Options, Rsvd */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:256:2: error: unknown type name uint32_t uint32_t preamble_word2; /* Cmd Code, Max Size */ ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:268:2: error: unknown type name uint32_t uint32_t msgcode; ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:292:2: error: unknown type name uint32_t uint32_t result; ^~~~~~~~ ./usr/include/scsi/scsi_bsg_fc.h:295:2: error: unknown type name uint32_t uint32_t reply_payload_rcv_len; ^~~~~~~~ Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-07-22scsi: ufs: uapi: Fix SPDX license identifierAvri Altman
Added 'WITH Linux-syscall-note' exception which is the officially assigned exception identifier for the kernel syscall exception. This exception makes it possible to include GPL headers into non GPL code without confusing license compliance tools. Fixes: a851b2bd3632 (scsi: uapi: ufs: Make utp_upiu_req visible to user space) Signed-off-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Pedro Sousa <pedrom.sousa@synopsys.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-05-21scsi: libfc: remove duplicate GPL boilerplate textChristoph Hellwig
The libfc uapi headers already have proper SPDX tags, remove the duplicate boilerplate text. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-05-21scsi: scsi_transport_fc: remove duplicate GPL boilerplate textChristoph Hellwig
The FC transport class uapi headers already have proper SPDX tags, remove the duplicate boilerplate text. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-05-21scsi: scsi_netlink: remove duplicate GPL boilerplate textChristoph Hellwig
The SCSI netlink uapi header already has a proper SPDX tag, remove the duplicate boilerplate text. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2019-04-08scsi: fc: add FPIN ELS definitionJames Smart
T11 has introduced a new Fabric Notifications mechanism whereby the fabric can notify a port of events occurring in the fabric. The notifications are given by the FPIN ELS. Add the FPIN ELS definitions to the kernel. Signed-off-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-10-15scsi: ufs: fix integer type usage in uapi headerArnd Bergmann
We get a warning from 'make headers_check' about a newly introduced usage of integer types in the scsi/scsi_bsg_ufs.h uapi header: usr/include/scsi/scsi_bsg_ufs.h:18: found __[us]{8,16,32,64} type without #include <linux/types.h> Aside from the missing linux/types.h inclusion, I also noticed that it uses the wrong types: 'u32' is not available at all in user space, and 'uint32_t' depends on the inclusion of a standard header that we should not include from kernel headers. Change the all to __u32 and similar types here. I also note the usage of '__be32' and '__be16' that seems unfortunate for a user space API. I wonder if it would be better to define the interface in terms of a CPU-endian structure and convert it in kernel space. Fixes: e77044c5a842 ("scsi: ufs-bsg: Add support for uic commands in ufs_bsg_request()") Fixes: df032bf27a41 ("scsi: ufs: Add a bsg endpoint that supports UPIUs") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Avri Altman <avri.altman@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-10-10scsi: ufs-bsg: Add support for uic commands in ufs_bsg_request()Avri Altman
Make ufshcd_send_uic_cmd() public for that. Signed-off-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-10-10scsi: ufs: Add a bsg endpoint that supports UPIUsAvri Altman
For now, just provide an API to allocate and remove ufs-bsg node. We will use this framework to manage ufs devices by sending UPIU transactions. For the time being, implements an empty bsg_request() - will add some more functionality in coming patches. Nonetheless, we reveal here the protocol we are planning to use: UFS Transport Protocol Transactions. UFS transactions consist of packets called UFS Protocol Information Units (UPIU). There are UPIU’s defined for UFS SCSI commands, responses, data in and data out, task management, utility functions, vendor functions, transaction synchronization and control, and more. By using UPIUs, we get access to the most fine-grained internals of this protocol, and able to communicate with the device in ways, that are sometimes beyond the capacity of the ufs driver. Moreover and as a result, our core structure - ufs_bsg_node has a pretty lean structure: using upiu transactions that contains the outmost detailed info, so we don't really need complex constructs to support it. Signed-off-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-10-10scsi: uapi: ufs: Make utp_upiu_req visible to user spaceAvri Altman
in preparation to send UPIU requests via bsg. Signed-off-by: Avri Altman <avri.altman@wdc.com> Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-11-02License cleanup: add SPDX license identifier to uapi header files with a licenseGreg Kroah-Hartman
Many user space API headers have licensing information, which is either incomplete, badly formatted or just a shorthand for referring to the license under which the file is supposed to be. This makes it hard for compliance tools to determine the correct license. Update these files with an SPDX license identifier. The identifier was chosen based on the license information in the file. GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license identifier with the added 'WITH Linux-syscall-note' exception, which is the officially assigned exception identifier for the kernel syscall exception: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". This exception makes it possible to include GPL headers into non GPL code, without confusing license compliance tools. Headers which have either explicit dual licensing or are just licensed under a non GPL license are updated with the corresponding SPDX identifier and the GPLv2 with syscall exception identifier. The format is: ((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE) SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. The update does not remove existing license information as this has to be done on a case by case basis and the copyright holders might have to be consulted. This will happen in a separate step. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-06-26scsi: cxlflash: Support AFU debugMatthew R. Ochs
Adopt the SISLite AFU debug capability to allow future CXL Flash adapters the ability to better debug AFU issues. Update the SISLite header with the changes necessary to support AFU debug operations and create a host ioctl interface for user debug software. Also update the cxlflash documentation to describe this new host ioctl. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-06-26scsi: cxlflash: Support LUN provisioningMatthew R. Ochs
Adopt the SISLite AFU LUN provisioning capability to allow future CXL Flash adapters the ability to better manage storage. Update the SISLite header with the changes necessary to support LUN provision operations and create a host ioctl interface for user LUN management software. Also update the cxlflash documentation to describe this new host ioctl. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-06-26scsi: cxlflash: Introduce host ioctl supportMatthew R. Ochs
As staging for supporting various host management functions, add a host ioctl infrastructure to filter ioctl commands and perform operations that are common for all host ioctls. Also update the cxlflash documentation to create a new section for documenting host ioctls. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-05-11uapi: export all headers under uapi directoriesNicolas Dichtel
Regularly, when a new header is created in include/uapi/, the developer forgets to add it in the corresponding Kbuild file. This error is usually detected after the release is out. In fact, all headers under uapi directories should be exported, thus it's useless to have an exhaustive list. After this patch, the following files, which were not exported, are now exported (with make headers_install_all): asm-arc/kvm_para.h asm-arc/ucontext.h asm-blackfin/shmparam.h asm-blackfin/ucontext.h asm-c6x/shmparam.h asm-c6x/ucontext.h asm-cris/kvm_para.h asm-h8300/shmparam.h asm-h8300/ucontext.h asm-hexagon/shmparam.h asm-m32r/kvm_para.h asm-m68k/kvm_para.h asm-m68k/shmparam.h asm-metag/kvm_para.h asm-metag/shmparam.h asm-metag/ucontext.h asm-mips/hwcap.h asm-mips/reg.h asm-mips/ucontext.h asm-nios2/kvm_para.h asm-nios2/ucontext.h asm-openrisc/shmparam.h asm-parisc/kvm_para.h asm-powerpc/perf_regs.h asm-sh/kvm_para.h asm-sh/ucontext.h asm-tile/shmparam.h asm-unicore32/shmparam.h asm-unicore32/ucontext.h asm-x86/hwcap2.h asm-xtensa/kvm_para.h drm/armada_drm.h drm/etnaviv_drm.h drm/vgem_drm.h linux/aspeed-lpc-ctrl.h linux/auto_dev-ioctl.h linux/bcache.h linux/btrfs_tree.h linux/can/vxcan.h linux/cifs/cifs_mount.h linux/coresight-stm.h linux/cryptouser.h linux/fsmap.h linux/genwqe/genwqe_card.h linux/hash_info.h linux/kcm.h linux/kcov.h linux/kfd_ioctl.h linux/lightnvm.h linux/module.h linux/nbd-netlink.h linux/nilfs2_api.h linux/nilfs2_ondisk.h linux/nsfs.h linux/pr.h linux/qrtr.h linux/rpmsg.h linux/sched/types.h linux/sed-opal.h linux/smc.h linux/smc_diag.h linux/stm.h linux/switchtec_ioctl.h linux/vfio_ccw.h linux/wil6210_uapi.h rdma/bnxt_re-abi.h Note that I have removed from this list the files which are generated in every exported directories (like .install or .install.cmd). Thanks to Julien Floret <julien.floret@6wind.com> for the tip to get all subdirs with a pure makefile command. For the record, note that exported files for asm directories are a mix of files listed by: - include/uapi/asm-generic/Kbuild.asm; - arch/<arch>/include/uapi/asm/Kbuild; - arch/<arch>/include/asm/Kbuild. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Mark Salter <msalter@redhat.com> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-11scsi: cxlflash: Support SQ Command ModeMatthew R. Ochs
The SISLite specification outlines a new queuing model to improve over the MMIO-based IOARRIN model that exists today. This new model uses a submission queue that exists in host memory and is shared with the device. Each entry in the queue is an IOARCB that describes a transfer request. When requests are submitted, IOARCBs ('current' position tracked in host software) are populated and the submission queue tail pointer is then updated via MMIO to make the device aware of the requests. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-12-06Add type 0x28 NVME type code to scsi fc headersJames Smart
Signed-off-by: James Smart <james.smart@broadcom.com> Acked-by: Johannes Thumshirn <jth@kernel.org> Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
2016-08-23scsi: cxlflash: Transition to application close modelMatthew R. Ochs
Caching the adapter file descriptor and performing a close on behalf of an application is a poor design. This is due to the fact that once a file descriptor in installed, it is free to be altered without the knowledge of the cxlflash driver. This can lead to inconsistencies between the application and kernel. Furthermore, the nature of the former design is more exploitable and thus should be abandoned. To support applications performing a close on the adapter file that is associated with a context, a new flag is introduced to the user API to indicate to applications that they are responsible for the close following the cleanup (detach) of a context. The documentation is also updated to reflect this change in behavior. Inspired-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Acked-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-06cxlflash: Fix to avoid virtual LUN failover failureMatthew R. Ochs
Applications which use virtual LUN's that are backed by a physical LUN over both adapter ports may experience an I/O failure in the event of a link loss (e.g. cable pull). Virtual LUNs may be accessed through one or both ports of the adapter. This access is encoded in the translation entries that comprise the virtual LUN and used by the AFU for load-balancing I/O and handling failover scenarios. In a link loss scenario, even though the AFU is able to maintain connectivity to the LUN, it is up to the application to retry the failed I/O. When applications are unaware of the virtual LUN's underlying topology, they are unable to make a sound decision of when to retry an I/O and therefore are forced to make their reaction to a failed I/O absolute. The result is either a failure to retry I/O or increased latency for scenarios where a retry is pointless. To remedy this scenario, provide feedback back to the application on virtual LUN creation as to which ports the LUN may be accessed. LUN's spanning both ports are candidates for a retry in a presence of an I/O failure. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Acked-by: Manoj Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2015-08-26cxlflash: Virtual LUN supportMatthew R. Ochs
Add support for physical LUN segmentation (virtual LUNs) to device driver supporting the IBM CXL Flash adapter. This patch allows user space applications to virtually segment a physical LUN into N virtual LUNs, taking advantage of the translation features provided by this adapter. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Michael Neuling <mikey@neuling.org> Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26cxlflash: Superpipe supportMatthew R. Ochs
Add superpipe supporting infrastructure to device driver for the IBM CXL Flash adapter. This patch allows userspace applications to take advantage of the accelerated I/O features that this adapter provides and bypass the traditional filesystem stack. Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com> Reviewed-by: Michael Neuling <mikey@neuling.org> Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com> Reviewed-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2013-03-01[SCSI] Merge tag 'fcoe-02-19-13' into for-linusJames Bottomley
FCoE Updates for 3.9 Signed-off-by: James Bottomley <JBottomley@Parallels.com>
2013-01-07UAPI: (Scripted) Disintegrate include/scsi/fcDavid Howells
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-12-19UAPI: (Scripted) Disintegrate include/scsiDavid Howells
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-10-02UAPI: (Scripted) Set up UAPI Kbuild filesDavid Howells
Set up empty UAPI Kbuild files to be populated by the header splitter. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>