kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-14 05:55:17 +00:00
Code Issues Releases Packages Activity

mlx5-updates-2021-03-29

Browse source 
Coexistence of CQE compression and HW PTP time-stamp:
 
 From Aya this series improves mlx5 netdev driver to allow
 both mlx5 CQE compression (RX descriptor compression, that saves on PCI
 transaction) and HW time-stamp PTP to co-exists.
 
 Prior to this series both features were mutually exclusive due to the
 nature of CQE compression which reduces the size of RX descriptor for
 the price of trimming some data, such as the time-stamp.
 
 In order to allow CQE compression when PTP time stamping is enabled,
 We enable it on the regular performance critical RX queues which will
 service all the data path traffic that is not PTP.
 
 PTP traffic will be re-directed to dedicated RX queues on which we will
 not enable CQE compression and thus keep the time-stamp intact.
 
 Having both features is critical for systems with low PCI BW, e.g.
 Multi-Host.
 
 The series will be adding:
 1) Infrastructure to create a dedicated RX queue to service the PTP traffic
 2) Flow steering plumbing to capture PTP traffic both UDP packets with
  destination port 319 and L2 packets with ethertype 0x88F7
 3) Steer PTP traffic to the dedicated RX queue.
 4) The feature will be enabled when PTP is being configured via the
    already existing PTP IOCTL when CQE compression is active, otherwise
    no change to the driver flow.
 -----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEGhZs6bAKwk/OTgTpSD+KveBX+j4FAmBip2IACgkQSD+KveBX
 +j5gvwf/W+nBOdtUjKfssaBD8we0aXGb9JSfZOfgo/buGbRK1myFDbQeTP5lA3E8
 Ld42+ZdvyT4k6viXEDK2+Pq65/6/HXpfKrp354Z1jf3JalvPKia4T990dSa3pF7r
 LrbmmRsdF0Ohx9cfNWagoiT9UTaY0qInKnhaEz9/VLvx3EQxp41B8HOW00jtg3Y0
 YwBpnHiFxQg4EBvXXB7Ka0EYKUAlH0z5e8eCx/GlX4NUIf/QdSF3iG9azI2kzXy8
 gvjPvltww/wJ87/Rr6Nm0lmnGI9ajg6b6hEWEIqa7gT8FHBQRb8BKyt5WjFxLxsk
 mTfqrUn2CaHbfDkflAA2Q6qMxg/CGg==
 =5kFJ
 -----END PGP SIGNATURE-----

Merge tag 'mlx5-updates-2021-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
mlx5-updates-2021-03-29

Coexistence of CQE compression and HW PTP time-stamp:

From Aya this series improves mlx5 netdev driver to allow
both mlx5 CQE compression (RX descriptor compression, that saves on PCI
transaction) and HW time-stamp PTP to co-exists.

Prior to this series both features were mutually exclusive due to the
nature of CQE compression which reduces the size of RX descriptor for
the price of trimming some data, such as the time-stamp.

In order to allow CQE compression when PTP time stamping is enabled,
We enable it on the regular performance critical RX queues which will
service all the data path traffic that is not PTP.

PTP traffic will be re-directed to dedicated RX queues on which we will
not enable CQE compression and thus keep the time-stamp intact.

Having both features is critical for systems with low PCI BW, e.g.
Multi-Host.

The series will be adding:
1) Infrastructure to create a dedicated RX queue to service the PTP traffic
2) Flow steering plumbing to capture PTP traffic both UDP packets with
 destination port 319 and L2 packets with ethertype 0x88F7
3) Steer PTP traffic to the dedicated RX queue.
4) The feature will be enabled when PTP is being configured via the
   already existing PTP IOCTL when CQE compression is active, otherwise
   no change to the driver flow.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-03-30 12:59:25 -07:00
commit 402a66edb9
19 changed files with 1298 additions and 128 deletions
Download patch file Download diff file Expand all files Collapse all files