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The driver associates two different structs with numeric handles and passes the handles to the hardware. When the hardware passes the handle back to the driver, the driver consults a table of void * to convert the handle back to the struct without checking the type of struct. This can lead to type confusion if the HBA firmware misbehaves (and some firmware versions do). So verify the type of struct is what is expected before using it. But we can also do better than that. Also verify that the exchange address of the message sent from the hardware matches the exchange address of the command being returned. This adds an extra guard against buggy HBA firmware that returns duplicate messages multiple times (which has also been seen) in case the driver has reused the handle for a different command of the same type. These problems were seen on a QLE2694L with firmware 9.08.02 when testing SLER / SRR support. The SRR caused the HBA to flood the response queue with hundreds of bogus entries. Signed-off-by: Tony Battersby <tonyb@cybernetics.com> Link: https://patch.msgid.link/7c7cb574-fe62-42ae-b800-d136d8dd89ca@cybernetics.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> [ commit 4f5eb50f7c82 upstream ]
Overview
This is the source code repository of the SCST project. SCST is a collection of Linux kernel drivers that implement SCSI target functionality. The SCST project includes:
- The SCST core in the scst/ subdirectory.
- A tool for loading, saving and modifying the SCST configuration in directory scstadmin/.
- Several SCSI target drivers in the directories iscsi-scst/, qla2x00t/, srpt/, scst_local/ and fcst/.
- User space programs in the usr/ subdirectory, e.g. fileio_tgt.
- Various documentation in the doc/ subdirectory.
Instructions for building and installing SCST are available in the INSTALL.md file.
QLogic target driver
Two QLogic target drivers are included in the SCST project.
The default driver is located in qla2x00t-32gbit directory and it supports up to 32 Gb/s FC. It is the newer one.
May anyone wish to switch back to the older driver that only supported up to
16 Gb/s adapters, it is located in qla2x00t directory. To make use of the
older driver build scst with environment variable QLA_32GBIT=no set.
Vladislav Bolkhovitin vst@vlnb.net, http://scst.sourceforge.net
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