[pull request][net-next V2 0/6] Mellanox, mlx5e updates 2018-05-19

[Saeed Mahameed <saeedm@mellanox.com>]

Hi Dave,

This is a mlx5e only pull request, for more information please see tag
log below.

Please pull and let me know if there's any problem.

v1->v2:
1) patch #1 commit message: lldptool usage example and explanation on why 
   dcbnl is selected over devlink interface as was agreed on mailing list.

2) patches #1 and #6: Add total_size in dcbnl_buffer to report the total
   available buffer size of the netdev, as suggested by John.

3) Added Reviewed-by tag to all the patches.

Thanks,
Saeed.

---

The following changes since commit 87e5808d52b65fc5b0bfda209ba8864cc2f933e5:

  net: phy: replace bool members in struct phy_device with bit-fields (2018-05-24 15:35:58 -0400)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git tags/mlx5e-updates-2018-05-19

for you to fetch changes up to ecdf2dadee8e8c5015771b802a9851ff332d3fc4:

  net/mlx5e: Receive buffer support for DCBX (2018-05-24 14:23:33 -0700)

----------------------------------------------------------------
mlx5e-updates-2018-05-19

This series contains updates for mlx5e netdevice driver with one subject,
DSCP to priority mapping, in the first patch Huy adds the needed API in
dcbnl, the second patch adds the needed mlx5 core capability bits for the
feature, and all other patches are mlx5e (netdev) only changes to add
support for the feature.

From: Huy Nguyen

Dscp to priority mapping for Ethernet packet:

These patches enable differentiated services code point (dscp) to
priority mapping for Ethernet packet. Once this feature is
enabled, the packet is routed to the corresponding priority based on its
dscp. User can combine this feature with priority flow control (pfc)
feature to have priority flow control based on the dscp.

Firmware interface:
Mellanox firmware provides two control knobs for this feature:
  QPTS register allow changing the trust state between dscp and
  pcp mode. The default is pcp mode. Once in dscp mode, firmware will
  route the packet based on its dscp value if the dscp field exists.

  QPDPM register allow mapping a specific dscp (0 to 63) to a
  specific priority (0 to 7). By default, all the dscps are mapped to
  priority zero.

Software interface:
This feature is controlled via application priority TLV. IEEE
specification P802.1Qcd/D2.1 defines priority selector id 5 for
application priority TLV. This APP TLV selector defines DSCP to priority
map. This APP TLV can be sent by the switch or can be set locally using
software such as lldptool. In mlx5 drivers, we add the support for net
dcb's getapp and setapp call back. Mlx5 driver only handles the selector
id 5 application entry (dscp application priority application entry).
If user sends multiple dscp to priority APP TLV entries on the same
dscp, the last sent one will take effect. All the previous sent will be
deleted.

This attribute combined with pfc attribute allows advanced user to
fine tune the qos setting for specific priority queue. For example,
user can give dedicated buffer for one or more priorities or user
can give large buffer to certain priorities.

The dcb buffer configuration will be controlled by lldptool.
>> lldptool -T -i eth2 -V BUFFER prio 0,2,5,7,1,2,3,6
      maps priorities 0,1,2,3,4,5,6,7 to receive buffer 0,2,5,7,1,2,3,6
>> lldptool -T -i eth2 -V BUFFER size 87296,87296,0,87296,0,0,0,0
      sets receive buffer size for buffer 0,1,2,3,4,5,6,7 respectively

After discussion on mailing list with Jakub, Jiri, Ido and John, we agreed to
choose dcbnl over devlink interface since this feature is intended to set
port attributes which are governed by the netdev instance of that port, where
devlink API is more suitable for global ASIC configurations.

The firmware trust state (in QPTS register) is changed based on the
number of dscp to priority application entries. When the first dscp to
priority application entry is added by the user, the trust state is
changed to dscp. When the last dscp to priority application entry is
deleted by the user, the trust state is changed to pcp.

When the port is in DSCP trust state, the transmit queue is selected
based on the dscp of the skb.

When the port is in DSCP trust state and vport inline mode is not NONE,
firmware requires mlx5 driver to copy the IP header to the
wqe ethernet segment inline header if the skb has it.
This is done by changing the transmit queue sq's min inline mode to L3.
Note that the min inline mode of sqs that belong to other features
such as xdpsq, icosq are not modified.

----------------------------------------------------------------
Huy Nguyen (6):
      net/dcb: Add dcbnl buffer attribute
      net/mlx5e: Move port speed code from en_ethtool.c to en/port.c
      net/mlx5: Add pbmc and pptb in the port_access_reg_cap_mask
      net/mlx5: PPTB and PBMC register firmware command support
      net/mlx5e: Receive buffer configuration
      net/mlx5e: Receive buffer support for DCBX

 drivers/net/ethernet/mellanox/mlx5/core/Makefile   |   4 +-
 drivers/net/ethernet/mellanox/mlx5/core/en.h       |   8 +-
 .../net/ethernet/mellanox/mlx5/core/en/Makefile    |   1 +
 drivers/net/ethernet/mellanox/mlx5/core/en/port.c  | 237 +++++++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/en/port.h  |  48 +++
 .../ethernet/mellanox/mlx5/core/en/port_buffer.c   | 327 +++++++++++++++++++++
 .../ethernet/mellanox/mlx5/core/en/port_buffer.h   |  75 +++++
 drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c | 132 ++++++++-
 .../net/ethernet/mellanox/mlx5/core/en_ethtool.c   | 102 +++----
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c  |   3 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c    |   3 +-
 include/linux/mlx5/device.h                        |   3 +
 include/linux/mlx5/driver.h                        |   2 +
 include/linux/mlx5/mlx5_ifc.h                      |  47 +++
 include/net/dcbnl.h                                |   4 +
 include/uapi/linux/dcbnl.h                         |  11 +
 net/dcb/dcbnl.c                                    |  20 ++
 17 files changed, 947 insertions(+), 80 deletions(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/Makefile
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/port.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/port.h
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/port_buffer.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/port_buffer.h