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Subbaraya Sundeep says: ==================== octeontx2-pf: RVU Mailbox fixes This patchset fixes the problems related to RVU mailbox. During long run tests some times VF commands like setting MTU or toggling interface fails because VF mailbox is timedout waiting for response from PF. Below are the fixes Patch 1: There are two types of messages in RVU mailbox namely up and down messages. Down messages are synchronous messages where a PF/VF sends a message to AF and AF replies back with response. UP messages are notifications and are asynchronous like AF sending link events to PF. When VF sends a down message to PF, PF forwards to AF and sends the response from AF back to VF. PF has to forward VF messages since there is no path in hardware for VF to send directly to AF. There is one mailbox interrupt from AF to PF when raised could mean two scenarios one is where AF sending reply to PF for a down message sent by PF and another one is AF sending up message asynchronously when link changed for that PF. Receiving the up message interrupt while PF is in middle of forwarding down message causes mailbox errors. Fix this by receiver detecting the type of message from the mbox data register set by sender. Patch 2: During VF driver remove, VF has to wait until last message is completed and then turn off mailbox interrupts from PF. Patch 3: Do not use ordered workqueue for message processing since multiple works are queued simultaneously by all the VFs and PF link UP messages. Patch 4: When sending link event to VF by PF check whether VF is really up to receive this message. Patch 5: In AF driver, use separate interrupt handlers for the AF-VF interrupt and AF-PF interrupt. Sometimes both interrupts are raised to two CPUs at same time and both CPUs execute same function at same time corrupting the data. v2 changes: Added missing mutex unlock in error path in patch 1 Refactored if else logic in patch 1 as suggested by Paolo Abeni ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the ReStructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.