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Paolo Abeni 30b3fe0672 Merge branch 'enable-rx-hw-timestamp-for-ptp-packets-using-cpts-fifo'
Chintan Vankar says:

====================
Enable RX HW timestamp for PTP packets using CPTS FIFO

The CPSW offers two mechanisms for communicating packet ingress timestamp
information to the host.

The first mechanism is via the CPTS Event FIFO which records timestamp
when triggered by certain events. One such event is the reception of an
Ethernet packet with a specified EtherType field. This is used to capture
ingress timestamps for PTP packets. With this mechanism the host must
read the timestamp (from the CPTS FIFO) separately from the packet payload
which is delivered via DMA.

In the second mechanism of timestamping, CPSW driver enables hardware
timestamping for all received packets by setting the TSTAMP_EN bit in
CPTS_CONTROL register, which directs the CPTS module to timestamp all
received packets, followed by passing timestamp via DMA descriptors.
This mechanism is responsible for triggering errata i2401:
"CPSW: Host Timestamps Cause CPSW Port to Lock up."

The errata affects all K3 SoCs. Link to errata for AM64x:
https://www.ti.com/lit/er/sprz457h/sprz457h.pdf

As a workaround we can use first mechanism to timestamp received
packets.
====================

Link: https://lore.kernel.org/r/20240419082626.57225-1-c-vankar@ti.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-04-23 12:07:25 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-04-18 13:12:24 -07:00
block block-6.9-20240412 2024-04-12 10:22:33 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto net: add sk_wake_async_rcu() helper 2024-03-29 15:03:11 -07:00
Documentation doc/netlink/specs: Add draft nftables spec 2024-04-22 17:20:42 -07:00
drivers net: ethernet: ti: am65-cpsw/ethtool: Enable RX HW timestamp only for PTP packets 2024-04-23 12:07:24 +02:00
fs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-04-18 13:12:24 -07:00
include Merge branch 'for-uring-ubufops' into HEAD 2024-04-22 17:15:39 -07:00
init fs/proc: Skip bootloader comment if no embedded kernel parameters 2024-04-09 23:36:18 +09:00
io_uring net: extend ubuf_info callback to ops structure 2024-04-22 16:21:35 -07:00
ipc sysctl: treewide: constify ctl_table_header::ctl_table_arg 2024-04-22 08:56:31 +01:00
kernel sysctl: treewide: constify ctl_table_header::ctl_table_arg 2024-04-22 08:56:31 +01:00
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tools tools/net/ynl: Add multi message support to ynl 2024-04-22 17:20:42 -07:00
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.cocciconfig
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COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
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Makefile Linux 6.9-rc4 2024-04-14 13:38:39 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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.