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  1. 05 12月, 2018 7 次提交
    • G
      net/mlx5e: Cleanup unused defines · 30543831
      由 Gal Pressman 提交于 
      Remove couple of defines that are no longer used.
Signed-off-by: NGal Pressman <pressmangal@gmail.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
      30543831
    • S
      net/mlx5e: Remove trailing space of tx_pause ethtool counter name · 8742c7eb
      由 Saeed Mahameed 提交于 
      tx_pause_storm_warning_events ethtool counter name has a trailing
space, remove it.
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
Reviewed-by: NEran Ben Elisha <eranbe@mellanox.com>
      8742c7eb
    • D
      Merge branch 'mlxsw-Add-one-armed-router-support' · 55827458
      由 David S. Miller 提交于 
      Ido Schimmel says:

====================
mlxsw: Add one-armed router support

Up until now, when a packet was routed by the ASIC through the same
router interface (RIF) from which it ingressed from, the ASIC passed the
sole copy of the packet to the kernel. This allowed the kernel to route
the packet and also potentially generate an ICMP redirect.

There are scenarios (e.g., "one-armed router") where packets are
intentionally routed this way and are therefore not deemed as
exceptions. In such scenarios the current method of trapping packets to
the CPU is problematic, as it results in major packet loss.

This patchset solves the problem by having the ASIC forward the packet,
but also send a copy to the CPU, which gives the kernel the opportunity
to generate required exceptions.

To prevent the kernel from forwarding such packets again, the driver
marks them with 'offload_l3_fwd_mark', which causes the kernel to
consume them in ip{,6}_forward_finish().

Patch #1 renames 'offload_mr_fwd_mark' to 'offload_l3_fwd_mark'. When
set, the field indicates that a packet was already forwarded in L3
(unicast / multicast) by a capable device.

Patch #2 teaches the kernel to consume unicast packets that have
'offload_l3_fwd_mark' set.

Patch #3 changes mlxsw to mirror loopbacked (iRIF == eRIF) packets,
instead of trapping them.

Patch #4 adds a test case for above mentioned scenario.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      55827458
    • I
      selftests: mlxsw: Add one-armed router test · b6f153d3
      由 Ido Schimmel 提交于 
      Construct a "one-armed router" topology and test that packets are
forwarded by the ASIC and that a copy of the packet is sent to the
kernel, which does not forward the packet again.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      b6f153d3
    • I
      mlxsw: spectrum: Mirror loopbacked packets instead of trapping them · 2f4f4494
      由 Ido Schimmel 提交于 
      When the ASIC detects that a unicast packet is routed through the same
router interface (RIF) from which it ingressed (iRIF == eRIF), it raises
a trap called loopback error (LBERROR).

Thus far, this trap was configured to send a sole copy of the packet to
the CPU so that ICMP redirect packets could be potentially generated by
the kernel.

This is problematic as the CPU cannot forward packets at 3.2Tb/s and
there are scenarios (e.g., "one-armed router") where iRIF == eRIF is not
an exception.

Solve this by changing the trap to send a copy of the packet to the CPU.
To prevent the kernel from forwarding the packet again, it is marked
with 'offload_l3_fwd_mark'.

The trap is configured in a trap group of its own with a dedicated
policer in order not to prevent packets trapped by other traps from
reaching the CPU.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2f4f4494
    • I
      net: Do not route unicast IP packets twice · f839a6c9
      由 Ido Schimmel 提交于 
      Packets marked with 'offload_l3_fwd_mark' were already forwarded by a
capable device and should not be forwarded again by the kernel.
Therefore, have the kernel consume them.

The check is performed in ip{,6}_forward_finish() in order to allow the
kernel to process such packets in ip{,6}_forward() and generate required
exceptions. For example, ICMP redirects.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      f839a6c9
    • I
      skbuff: Rename 'offload_mr_fwd_mark' to 'offload_l3_fwd_mark' · 875e8939
      由 Ido Schimmel 提交于 
      Commit abf4bb6b ("skbuff: Add the offload_mr_fwd_mark field") added
the 'offload_mr_fwd_mark' field to indicate that a packet has already
undergone L3 multicast routing by a capable device. The field is used to
prevent the kernel from forwarding a packet through a netdev through
which the device has already forwarded the packet.

Currently, no unicast packet is routed by both the device and the
kernel, but this is about to change by subsequent patches and we need to
be able to mark such packets, so that they will no be forwarded twice.

Instead of adding yet another field to 'struct sk_buff', we can just
rename 'offload_mr_fwd_mark' to 'offload_l3_fwd_mark', as a packet
either has a multicast or a unicast destination IP.

While at it, add a comment about both 'offload_fwd_mark' and
'offload_l3_fwd_mark'.
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      875e8939
  3. 04 12月, 2018 33 次提交