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  1. 25 5月, 2018 3 次提交
    • H
      net/mlx5e: Move port speed code from en_ethtool.c to en/port.c · 2c81bfd5
      由 Huy Nguyen 提交于 
      Move four below functions from en_ethtool.c to en/port.c. These
functions are used by both en_ethtool.c and en_main.c. Future code
can use these functions without ethtool link mode dependency.
  u32 mlx5e_port_ptys2speed(u32 eth_proto_oper);
  int mlx5e_port_linkspeed(struct mlx5_core_dev *mdev, u32 *speed);
  int mlx5e_port_max_linkspeed(struct mlx5_core_dev *mdev, u32 *speed);
  u32 mlx5e_port_speed2linkmodes(u32 speed);

Delete the speed field from table mlx5e_build_ptys2ethtool_map. This
table only keeps the mapping between the mlx5e link mode and
ethtool link mode. Add new table mlx5e_link_speed for translation
from mlx5e link mode to actual speed.
Signed-off-by: NHuy Nguyen <huyn@mellanox.com>
Reviewed-by: NParav Pandit <parav@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
      2c81bfd5
    • H
      net/dcb: Add dcbnl buffer attribute · e549f6f9
      由 Huy Nguyen 提交于 
      In this patch, we add dcbnl buffer attribute to allow user
change the NIC's buffer configuration such as priority
to buffer mapping and buffer size of individual buffer.

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.

We present an use case scenario where dcbnl buffer attribute configured
by advance user helps reduce the latency of messages of different sizes.

Scenarios description:
On ConnectX-5, we run latency sensitive traffic with
small/medium message sizes ranging from 64B to 256KB and bandwidth sensitive
traffic with large messages sizes 512KB and 1MB. We group small, medium,
and large message sizes to their own pfc enables priorities as follow.
  Priorities 1 & 2 (64B, 256B and 1KB)
  Priorities 3 & 4 (4KB, 8KB, 16KB, 64KB, 128KB and 256KB)
  Priorities 5 & 6 (512KB and 1MB)

By default, ConnectX-5 maps all pfc enabled priorities to a single
lossless fixed buffer size of 50% of total available buffer space. The
other 50% is assigned to lossy buffer. Using dcbnl buffer attribute,
we create three equal size lossless buffers. Each buffer has 25% of total
available buffer space. Thus, the lossy buffer size reduces to 25%. Priority
to lossless  buffer mappings are set as follow.
  Priorities 1 & 2 on lossless buffer #1
  Priorities 3 & 4 on lossless buffer #2
  Priorities 5 & 6 on lossless buffer #3

We observe improvements in latency for small and medium message sizes
as follows. Please note that the large message sizes bandwidth performance is
reduced but the total bandwidth remains the same.
  256B message size (42 % latency reduction)
  4K message size (21% latency reduction)
  64K message size (16% latency reduction)

CC: Ido Schimmel <idosch@idosch.org>
CC: Jakub Kicinski <jakub.kicinski@netronome.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Or Gerlitz <gerlitz.or@gmail.com>
CC: Parav Pandit <parav@mellanox.com>
CC: Aron Silverton <aron.silverton@oracle.com>
Signed-off-by: NHuy Nguyen <huyn@mellanox.com>
Reviewed-by: NParav Pandit <parav@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
      e549f6f9
    • H
      net: phy: replace bool members in struct phy_device with bit-fields · 87e5808d
      由 Heiner Kallweit 提交于 
      In struct phy_device we have a number of flags being defined as type
bool. Similar to e.g. struct pci_dev we can save some space by using
bit-fields.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      87e5808d
  3. 24 5月, 2018 37 次提交