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mlx5-updates-2020-12-01
mlx5e port TX timestamping support and MISC updates 1) Add support for port TX timestamping, for better PTP accuracy. Currently in mlx5 HW TX timestamping is done on CQE (TX completion) generation, which much earlier than when the packet actually goes out to the wire, in this series Eran implements the option to do timestamping on the port using a special SQ (Send Queue), such Send Queue will generate 2 CQEs (TX completions), the original one and a new one when the packet leaves the port, due to the nature of this special handling, such mechanism is an opt-in only and it is off by default to avoid any performance degradation on normal traffic flows. This patchset improves TX Hardware timestamping offset to be less than 40ns at a 100Gbps line rate, compared to 600ns before. With that, making our HW compliant with G.8273.2 class C, and allow Linux systems to be deployed in the 5G telco edge, where this standard is a must. 2) Misc updates and trivial improvements. -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEGhZs6bAKwk/OTgTpSD+KveBX+j4FAl/P0/EACgkQSD+KveBX +j5ETAf/Y6zPUHEk8mufD7RJaeQ/11gDtT3JKaPfcYBxaHs9VOPUTA2vemAZUuM0 0Rfsrv25PeLjvBtE2wCyA/gZ9naEeE2UELHR6FKEipnrnT+b2JD/dYG9Nb7EiARw zu8djoOza/bLLKvNew+VAr1P0+of0IIkD7NXqRTnUTnATQubLYm/AF7TGhINIa8H xXnBHu1C7Lz8Ow2f6IBA1ntrGoWApdyuXpHJQlJvwgpPLXkD10GEoqXk3LtP11/J KCAKDdMAlChydCo2rmruwwCM0z3Gjl86uffIbLE0bbJJGk3Gpkq12B2aUk/l3Xzj Y3RtiMHTgqaqo9AVjBPI435mw/LPvA== =kvQC -----END PGP SIGNATURE----- Merge tag 'mlx5-updates-2020-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux mlx5-updates-2020-12-01 mlx5e port TX timestamping support and MISC updates 1) Add support for port TX timestamping, for better PTP accuracy. Currently in mlx5 HW TX timestamping is done on CQE (TX completion) generation, which much earlier than when the packet actually goes out to the wire, in this series Eran implements the option to do timestamping on the port using a special SQ (Send Queue), such Send Queue will generate 2 CQEs (TX completions), the original one and a new one when the packet leaves the port, due to the nature of this special handling, such mechanism is an opt-in only and it is off by default to avoid any performance degradation on normal traffic flows. This patchset improves TX Hardware timestamping offset to be less than 40ns at a 100Gbps line rate, compared to 600ns before. With that, making our HW compliant with G.8273.2 class C, and allow Linux systems to be deployed in the 5G telco edge, where this standard is a must. 2) Misc updates and trivial improvements. Signed-off-by: David S. Miller <davem@davemloft.net>
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