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58a518948f
PTP TX port timestamp relies on receiving 2 CQEs for each outgoing packet (WQE). The regular CQE has a less accurate timestamp than the wire CQE. On link change, the wire CQE may get lost. Let the driver detect and restore the relation between the CQEs, and re-sync after timeout. Add resiliency for this as follows: add id (producer counter) into the WQE's metadata. This id will be received in the wire CQE (in wqe_counter field). On handling the wire CQE, if there is no match, replay the PTP application with the time-stamp from the regular CQE and restore the sync between the CQEs and their SKBs. This patch adds 2 ptp counters: 1) ptp_cq0_resync_event: number of times a mismatch was detected between the regular CQE and the wire CQE. 2) ptp_cq0_resync_cqe: total amount of missing wire CQEs. Signed-off-by: Aya Levin <ayal@nvidia.com> Reviewed-by: Tariq Toukan <tariqt@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com> |
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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.