linux/Documentation/networking/device_drivers/ethernet/amazon, branch master

net: ena: Add PHC documentation

2025-06-19T01:57:29Z

Provide the relevant information and guidelines about the feature support in the ENA driver. Signed-off-by: Amit Bernstein Signed-off-by: David Arinzon Link: https://patch.msgid.link/20250617110545.5659-10-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add debugfs support to the ENA driver

2025-06-19T01:57:29Z

Adding the base directory of debugfs to the driver. In order for the folder to be unique per driver instantiation, the chosen name is the device name. This commit contains the initialization and the base folder. The creation of the base folder may fail, but is considered non-fatal. Signed-off-by: David Arinzon Link: https://patch.msgid.link/20250617110545.5659-8-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add device reload capability through devlink

2025-06-19T01:57:28Z

Adding basic devlink capability support of reloading the driver. This capability is required to support driver init type devlink params (DEVLINK_PARAM_CMODE_DRIVERINIT). Such params require reloading of the driver (destroy/restore sequence). The reloading is done by the devlink framework using the hooks provided by the driver. Signed-off-by: David Arinzon Link: https://patch.msgid.link/20250617110545.5659-4-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add PHC support in the ENA driver

2025-06-19T01:57:28Z

The ENA driver will be extended to support the new PHC feature using ptp_clock interface [1]. this will provide timestamp reference for user space to allow measuring time offset between the PHC and the system clock in order to achieve nanosecond accuracy. [1] - https://www.kernel.org/doc/html/latest/driver-api/ptp.html Signed-off-by: Amit Bernstein Signed-off-by: David Arinzon Link: https://patch.msgid.link/20250617110545.5659-2-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add ENA Express metrics support

2024-09-13T01:01:17Z

ENA Express metrics, called `ena_srd` are exposed to customers via `ethtool`. The metrics allow customers to check the configuration (mode), tx/rx counters as well as resource utilization. The documentation is also updated to provide a general explanation about ENA Express as well as links for further information about metrics and configurations. Signed-off-by: Igor Chauskin Signed-off-by: David Arinzon Link: https://patch.msgid.link/20240909084704.13856-2-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add more documentation for RX copybreak

2024-02-01T12:22:12Z

This patch contains more details about the functionality of RX copybreak. Signed-off-by: Shay Agroskin Signed-off-by: David Arinzon Signed-off-by: Paolo Abeni

net: ena: Move XDP code to its new files

2024-01-04T02:00:56Z

XDP system has a very large footprint in the driver's overall code. makes the whole driver's code much harder to read. Moving XDP code to dedicated files. This patch doesn't make any changes to the code itself and only cut-pastes the code into ena_xdp.c and ena_xdp.h files so the change is purely cosmetic. Signed-off-by: Shay Agroskin Signed-off-by: David Arinzon Link: https://lore.kernel.org/r/20240101190855.18739-2-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Fix rst format issues in readme

2023-06-22T05:43:13Z

This patch fixes a warning in the ena documentation file identified by the kernel automatic tools. The patch also adds a missing newline between sections. Signed-off-by: David Arinzon Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202306171804.U7E92zoE-lkp@intel.com/ Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/20230620133544.32584-1-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Add dynamic recycling mechanism for rx buffers

2023-06-16T05:45:47Z

The current implementation allocates page-sized rx buffers. As traffic may consist of different types and sizes of packets, in various cases, buffers are not fully used. This change (Dynamic RX Buffers - DRB) uses part of the allocated rx page needed for the incoming packet, and returns the rest of the unused page to be used again as an rx buffer for future packets. A threshold of 2K for unused space has been set in order to declare whether the remainder of the page can be reused again as an rx buffer. As a page may be reused, dma_sync_single_for_cpu() is added in order to sync the memory to the CPU side after it was owned by the HW. In addition, when the rx page can no longer be reused, it is being unmapped using dma_page_unmap(), which implicitly syncs and then unmaps the entire page. In case the kernel still handles the skbs pointing to the previous buffers from that rx page, it may access garbage pointers, caused by the implicit sync overwriting them. The implicit dma sync is removed by replacing dma_page_unmap() with dma_unmap_page_attrs() with DMA_ATTR_SKIP_CPU_SYNC flag. The functionality is disabled for XDP traffic to avoid handling several descriptors per packet. Signed-off-by: Arthur Kiyanovski Signed-off-by: Shay Agroskin Signed-off-by: David Arinzon Link: https://lore.kernel.org/r/20230612121448.28829-1-darinzon@amazon.com Signed-off-by: Jakub Kicinski

net: ena: Update LLQ header length in ena documentation

2022-01-08T03:25:50Z

LLQ entry length is 128 bytes. Therefore the maximum header in the entry is calculated by: tx_max_header_size = LLQ_ENTRY_SIZE - DESCRIPTORS_NUM_BEFORE_HEADER * 16 = 128 - 2 * 16 = 96 This patch updates the documentation so that it states the correct max header length. Signed-off-by: Shay Agroskin Signed-off-by: Arthur Kiyanovski Signed-off-by: Jakub Kicinski