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path: root/drivers/scsi/storvsc_drv.c
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2017-06-26scsi: storvsc: use default I/O timeout handler for FC devicesLong Li
FC disks issue I/O directly to the host storage port driver, this is diffirent to VHD disks where I/O is virtualized and timeout is handled by the host VSP (Virtualization Service Provider). FC disks are usually setup in a multipath system, and they don't want to reset timer on I/O timeout. Timeout is detected by multipath as a good time to failover and recover. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-06-12scsi: storvsc: remove unnecessary channel inbound lockStephen Hemminger
In storvsc driver, inbound messages do not go through inbound lock. The only effect of this lock was is to provide a barrier for connect and remove logic. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-06-12scsi: storvsc: use in place iterator functionStephen Hemminger
In 4.12-rc1, new functions were added to support iterating over elements in the vmbus event ring. This patch uses them to simplify the ring buffer handling in virtual SCSI driver as well. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-05-04Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds
Pull SCSI updates from James Bottomley: "This update includes the usual round of major driver updates (hisi_sas, ufs, fnic, cxlflash, be2iscsi, ipr, stex). There's also the usual amount of cosmetic and spelling stuff" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (155 commits) scsi: qla4xxx: fix spelling mistake: "Tempalate" -> "Template" scsi: stex: make S6flag static scsi: mac_esp: fix to pass correct device identity to free_irq() scsi: aacraid: pci_alloc_consistent() failures on ARM64 scsi: ufs: make ufshcd_get_lists_status() register operation obvious scsi: ufs: use MASK_EE_STATUS scsi: mac_esp: Replace bogus memory barrier with spinlock scsi: fcoe: make fcoe_e_d_tov and fcoe_r_a_tov static scsi: sd_zbc: Do not write lock zones for reset scsi: sd_zbc: Remove superfluous assignments scsi: sd: sd_zbc: Rename sd_zbc_setup_write_cmnd scsi: Improve scsi_get_sense_info_fld scsi: sd: Cleanup sd_done sense data handling scsi: sd: Improve sd_completed_bytes scsi: sd: Fix function descriptions scsi: mpt3sas: remove redundant wmb scsi: mpt: Move scsi_remove_host() out of mptscsih_remove_host() scsi: sg: reset 'res_in_use' after unlinking reserved array scsi: mvumi: remove code handling zero scsi_sg_count(scmd) case scsi: fusion: fix spelling mistake: "Persistancy" -> "Persistency" ...
2017-04-19scsi: storvsc: Add support for FC rport.Cathy Avery
Included in the current storvsc driver for Hyper-V is the ability to access luns on an FC fabric via a virtualized fiber channel adapter exposed by the Hyper-V host. The driver also attaches to the FC transport to allow host and port names to be published under /sys/class/fc_host/hostX. Current customer tools running on the VM require that these names be available in the well known standard location under fc_host/hostX. This patch stubs in an rport per fc_host and sets its rport role as FC_PORT_ROLE_FCP_DUMMY_INITIATOR to indicate to the fc_transport that it is a pseudo rport in order to scan the scsi stack via echo "- - -" > /sys/class/scsi_host/hostX/scan. Signed-off-by: Cathy Avery <cavery@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-04-13scsi: storvsc: remove return at end of void functionMiguel Bernal Marin
storvsc_on_channel_callback is a void function and the return statement at the end is not useful. Found with checkpatch. Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-04-13scsi: storvsc: Prefer kcalloc over kzalloc with multiplyMiguel Bernal Marin
Use kcalloc for allocating an array instead of kzalloc with multiply, kcalloc is the preferred API. Found with checkpatch. Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-03-12Merge remote-tracking branch 'mkp-scsi/4.11/scsi-fixes' into fixesJames Bottomley
2017-03-07scsi: storvsc: Workaround for virtual DVD SCSI versionStephen Hemminger
Hyper-V host emulation of SCSI for virtual DVD device reports SCSI version 0 (UNKNOWN) but is still capable of supporting REPORTLUN. Without this patch, a GEN2 Linux guest on Hyper-V will not boot 4.11 successfully with virtual DVD ROM device. What happens is that the SCSI scan process falls back to doing sequential probing by INQUIRY. But the storvsc driver has a previous workaround that masks/blocks all errors reports from INQUIRY (or MODE_SENSE) commands. This workaround causes the scan to then populate a full set of bogus LUN's on the target and then sends kernel spinning off into a death spiral doing block reads on the non-existent LUNs. By setting the correct blacklist flags, the target with the DVD device is scanned with REPORTLUN and that works correctly. Patch needs to go in current 4.11, it is safe but not necessary in older kernels. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-02-27scripts/spelling.txt: add "intialization" pattern and fix typo instancesMasahiro Yamada
Fix typos and add the following to the scripts/spelling.txt: intialization||initialization The "inintialization" in drivers/acpi/spcr.c is a different pattern but I fixed it as well in this commit. Link: http://lkml.kernel.org/r/1481573103-11329-16-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-06scsi: remove eh_timed_out methods in the transport templateChristoph Hellwig
Instead define the timeout behavior purely based on the host_template eh_timed_out method and wire up the existing transport implementations in the host templates. This also clears up the confusion that the transport template method overrides the host template one, so some drivers have to re-override the transport template one. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-31scsi: storvsc: remove bogus code to transfer struct scatterlistChristoph Hellwig
Remove a piece of code in storvsc_queuecommand that tries to pass the physical address of the kernel struct scatterlist pointer to the host. Fortunately the code can't ever be reached anyway. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: properly set residual data length on errorsLong Li
On I/O errors, the Windows driver doesn't set data_transfer_length on error conditions other than SRB_STATUS_DATA_OVERRUN. In these cases we need to set data_transfer_length to 0, indicating there is no data transferred. On SRB_STATUS_DATA_OVERRUN, data_transfer_length is set by the Windows driver to the actual data transferred. Reported-by: Shiva Krishna <Shiva.Krishna@nimblestorage.com> Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: properly handle SRB_ERROR when sense message is presentLong Li
When sense message is present on error, we should pass along to the upper layer to decide how to deal with the error. This patch fixes connectivity issues with Fiber Channel devices. Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: use tagged SRB requests if supported by the deviceLong Li
Properly set SRB flags when hosting device supports tagged queuing. This patch improves the performance on Fiber Channel disks. Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: Enable multi-queue supportK. Y. Srinivasan
Enable multi-q support. We will allocate the outgoing channel using the following policy: 1. We will make every effort to pick a channel that is in the same NUMA node that is initiating the I/O 2. The mapping between the guest CPU and the outgoing channel is persistent. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: Remove the restriction on max segment sizeK. Y. Srinivasan
Remove the artificially imposed restriction on max segment size. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-01-05scsi: storvsc: Enable tracking of queue depthK. Y. Srinivasan
Enable tracking of queue depth. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-11-30scsi: storvsc: Payload buffer incorrectly sized for 32 bit kernels.Cathy Avery
On a 32 bit kernel sizeof(void *) is not 64 bits as hv_mpb_array requires. Also the buffer needs to be cleared or the upper bytes will contain junk. Suggested-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Cathy Avery <cavery@redhat.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-07-12scsi: storvsc: Filter out storvsc messages CD-ROM medium not presentCathy Avery
When a virtual scsi DVD device is present with no image file attached the storvsc driver logs all resulting unnecessary sense errors whenever IO is issued to the device. [storvsc] Sense Key : Not Ready [current] [storvsc] Add. Sense: Medium not present - tray closed [mkp: Fixed whitespace] Signed-off-by: Cathy Avery <cavery@redhat.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-03-08scsi: storvsc: fix SRB_STATUS_ABORTED handlingVitaly Kuznetsov
Commit 3209f9d780d1 ("scsi: storvsc: Fix a bug in the handling of SRB status flags") filtered SRB_STATUS_AUTOSENSE_VALID out effectively making the (SRB_STATUS_ABORTED | SRB_STATUS_AUTOSENSE_VALID) case a dead code. The logic from this branch (e.g. storvsc_device_scan() call) is still required, fix the check. Cc: <stable@vger.kernel.org> #v4.4+ Fixes: 3209f9d780d1 ("scsi: storvsc: Fix a bug in the handling of SRB status flags") Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-02-04Merge remote-tracking branch 'mkp-scsi/4.5/scsi-fixes' into fixesJames Bottomley
2016-01-28storvsc: Use the specified target ID in device lookupK. Y. Srinivasan
The current code assumes that there is only one target in device lookup. Fix this bug. This will alow us to correctly handle hot reomoval of LUNs. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Alex Ng <alexng@microsoft.com> Tested-by: Vivek Yadav <vyadav@microsoft.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-28storvsc: Install the storvsc specific timeout handler for FC devicesK. Y. Srinivasan
The default timeout routine used for FC transport is not suitable for FC devices managed by storvsc since FC devices managed by storvsc driver do not have an rport associated with them. Use the time out handler used for SCSI devices for FC devices as well. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Alex Ng <alexng@microsoft.com> Tested-by: Vivek Yadav <vyadav@microsoft.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-08storvsc: Fix typo in MODULE_PARM_DESCDan Carpenter
The module_param is "storvsc_vcpus_per_sub_channel" so we need to use that for MODULE_PARM_DESC() as well. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-06storvsc: Tighten up the interrupt pathK. Y. Srinivasan
On the interrupt path, we repeatedly establish the pointer to the storvsc_device. While the compiler does inline get_in_stor_device() (and other static functions) in the call chain in the interrupt path, the compiler is repeatedly inlining the call to get_in_stor_device() each time it is invoked. The return value of get_in_stor_device() can be cached in the interrupt path since there is higher level serialization in place to ensure correct handling when the module unload races with the processing of an incoming message from the host. Optimize this code path by caching the pointer to storvsc_device and passing it as an argument. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-06storvsc: Refactor the code in storvsc_channel_init()K. Y. Srinivasan
The function storvsc_channel_init() repeatedly interacts with the host to extract various channel properties. Refactor this code to eliminate code repetition. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-06storvsc: Properly support Fibre Channel devicesK. Y. Srinivasan
For FC devices managed by this driver, atttach the appropriate transport template. This will allow us to create the appropriate sysfs files for these devices. With this we can publish the wwn for both the port and the node. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2016-01-06storvsc: Fix a bug in the layout of the hv_fc_wwn_packetK. Y. Srinivasan
The hv_fc_wwn_packet is exchanged over vmbus. Make the definition in Linux match the Windows definition. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Long Li <longli@microsoft.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2015-12-10storvsc: add logging for error/warning messagesLong Li
Introduce a logging level for storvsc to log certain error/warning messages. Those messages are helpful in some environments, e.g. Microsoft Azure, for customer support and troubleshooting purposes. Signed-off-by: Long Li <longli@microsoft.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2015-11-09scsi: storvsc: Fix a bug in the handling of SRB status flagsK. Y. Srinivasan
SRB status can have additional information. Mask these out before processing SRB status. This patch was sent as part of a collection of patches more than a year ago. While the rest of the patches in the set were comitted, this patch was not. I woulod like to thank Olaf for noticing that this patch was not committed upstream. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-11-09storvsc: get rid of bounce bufferVitaly Kuznetsov
Storvsc driver needs to ensure there are no 'holes' in the presented sg list (all segments in the middle of the list need to be of PAGE_SIZE). When a hole is detected storvsc driver creates a 'bounce sgl' without holes and copies data over with copy_{to,from}_bounce_buffer() functions. Setting virt_boundary_mask to PAGE_SIZE - 1 guarantees we'll never see such holes so we can significantly simplify the driver. This is also supposed to bring us some performance improvement for certain workloads as we eliminate copying. Reported-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-11-09storvsc: Don't set the SRB_FLAGS_QUEUE_ACTION_ENABLE flagK. Y. Srinivasan
Don't set the SRB_FLAGS_QUEUE_ACTION_ENABLE flag since we are not specifying tags. Without this, the qlogic driver doesn't work properly with storvsc. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Cc: stable@vger.kernel.org Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: Set the error code correctly in failure conditionsK. Y. Srinivasan
In the function storvsc_channel_init(), error code was not getting set correctly in some of the failure cases. Fix this issue. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: Allow write_same when host is windows 10Keith Mange
Allow WRITE_SAME for Windows10 and above hosts. Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: use storage protocol version to determine storage capabilitiesKeith Mange
Use storage protocol version instead of vmbus protocol version when determining storage capabilities. Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: use correct defaults for values determined by protocol negotiationKeith Mange
Use correct defaults for values determined by protocol negotiation, instead of resetting them with every scsi controller. Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: Untangle the storage protocol negotiation from the vmbus protocol ↵Keith Mange
negotiation. Currently we are making decisions based on vmbus protocol versions that have been negotiated; use storage potocol versions instead. [jejb: fold ARRAY_SIZE conversion suggested by Johannes Thumshirn <jthumshirn@suse.de> make vmstor_protocol static] Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: Use a single value to track protocol versionsKeith Mange
Use a single value to track protocol versions to simplify comparisons and to be consistent with vmbus version tracking. Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-26storvsc: Rather than look for sets of specific protocol versions, make ↵Keith Mange
decisions based on ranges. Rather than look for sets of specific protocol versions, make decisions based on ranges. This will be safer and require fewer changes going forward as we add more storage protocol versions. Tested-by: Alex Ng <alexng@microsoft.com> Signed-off-by: Keith Mange <keith.mange@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-12storvsc: use shost_for_each_device() instead of open codingVitaly Kuznetsov
Comment in struct Scsi_Host says that drivers are not supposed to access __devices directly. storvsc_host_scan() doesn't happen in irq context so we can just use shost_for_each_device(). Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Long Li <longli@microsoft.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-08-12storvsc: be more picky about scmnd->sc_data_directionVitaly Kuznetsov
Under the 'default' case in scmnd->sc_data_direction we have 3 options: - DMA_NONE which we handle correctly. - DMA_BIDIRECTIONAL which is never supposed to be set by SCSI stack. - Garbage value. Do WARN() and return -EINVAL in the last two cases. virtio_scsi does BUG_ON() here but it looks like an overkill. Reported-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Acked-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-05-11storvsc: Set the SRB flags correctly when no data transfer is neededK. Y. Srinivasan
Set the SRB flags correctly when there is no data transfer. Without this change some IHV drivers will fail valid commands such as TEST_UNIT_READY. Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Set the tablesize based on the information given by the hostK. Y. Srinivasan
Set the tablesize based on the information given by the host. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Tested-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Don't assume that the scatterlist is not chainedK. Y. Srinivasan
The current code assumes that the scatterlists presented are not chained. Fix the code to not make this assumption. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Fix a bug in copy_from_bounce_buffer()K. Y. Srinivasan
We may exit this function without properly freeing up the maapings we may have acquired. Fix the bug. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Retrieve information about the capability of the targetK. Y. Srinivasan
The storage protocol informs the guest of the I/O capabilities of the storage stack. Retrieve this information and use it in the guest. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Always send on the selected outgoing channelK. Y. Srinivasan
The current code always sent packets without data on the primary channel. Properly distribute sending of packets with no data amongst all available channels. I would like to thank Long Li for noticing this problem. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Size the queue depth based on the ringbuffer sizeK. Y. Srinivasan
Size the queue depth based on the ringbuffer size. Also accommodate for the fact that we could have multiple channels (ringbuffers) per adaptor. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-09scsi: storvsc: Increase the ring buffer sizeK. Y. Srinivasan
Increase the default ring buffer size as this can significantly improve performance especially on high latency storage back-ends. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Reviewed-by: Long Li <longli@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Odin.com>
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