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This patch introduces a hierarchical backlog mechanism to cache user data in high-throughput encryption/decryption scenarios, the implementation addresses packet loss issues when hardware queues overflow during peak loads. First, we use sec_alloc_req_id to obtain an exclusive resource from the pre-allocated resource pool of each queue, if no resource is allocated, perform the DMA map operation on the request memory. When the task is ready, we will attempt to send it to the hardware, if the hardware queue is already full, we cache the request into the backlog list, then return an EBUSY status to the upper layer and instruct the packet-sending thread to pause transmission. Simultaneously, when the hardware completes a task, it triggers the sec callback function, within this function, reattempt to send the requests from the backlog list and wake up the sending thread until the hardware queue becomes fully occupied again. In addition, it handles such exceptions like the hardware is reset when packets are sent, it will switch to the software computing and release occupied resources. Signed-off-by: Wenkai Lin <linwenkai6@hisilicon.com> Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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 reStructuredText 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.