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  1. 11 Apr, 2021 28 commits
  3. 15 Mar, 2021 7 commits
  5. 14 Mar, 2021 5 commits
    • David S. Miller's avatar
      Merge branch 'psample-Add-additional-metadata-attributes' · 2117fce8
      David S. Miller authored 
      Ido Schimmel says:

====================
psample: Add additional metadata attributes

This series extends the psample module to expose additional metadata to
user space for packets sampled via act_sample. The new metadata (e.g.,
transit delay) can then be consumed by applications such as hsflowd [1]
for better network observability.

netdevsim is extended with a dummy psample implementation that
periodically reports "sampled" packets to the psample module. In
addition to testing of the psample module, it enables the development
and demonstration of user space applications (e.g., hsflowd) that are
interested in the new metadata even without access to specialized
hardware (e.g., Spectrum ASIC) that can provide it.

mlxsw is also extended to provide the new metadata to psample.

A Wireshark dissector for psample netlink packets [2] will be submitted
upstream after the kernel patches are accepted. In addition, a libpcap
capture module for psample is currently in the works. Eventually, users
should be able to run:

 # tshark -i psample

In order to consume sampled packets along with their metadata.

Series overview:

Patch #1 makes it easier to extend the metadata provided to psample

Patch #2 adds the new metadata attributes to psample

Patch #3 extends netdevsim to periodically report "sampled" packets to
psample. Various debugfs knobs are added to control the reporting

Patch #4 adds a selftest over netdevsim

Patches #5-#10 gradually add support for the new metadata in mlxsw

Patch #11 adds a selftest over mlxsw

[1] https://sflow.org/draft4_sflow_transit.txt
[2] https://gitlab.com/amitcohen1/wireshark/-/commit/3d711143024e032aef1b056dd23f0266c54fab56
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2117fce8
    • Ido Schimmel's avatar
      selftests: mlxsw: Add tc sample tests · bb24d592
      Ido Schimmel authored 
      Test that packets are sampled when tc-sample is used and that reported
metadata is correct. Two sets of hosts (with and without LAG) are used,
since metadata extraction in mlxsw is a bit different when LAG is
involved.

 # ./tc_sample.sh
 TEST: tc sample rate (forward)                                      [ OK ]
 TEST: tc sample rate (local receive)                                [ OK ]
 TEST: tc sample maximum rate                                        [ OK ]
 TEST: tc sample group conflict test                                 [ OK ]
 TEST: tc sample iif                                                 [ OK ]
 TEST: tc sample lag iif                                             [ OK ]
 TEST: tc sample oif                                                 [ OK ]
 TEST: tc sample lag oif                                             [ OK ]
 TEST: tc sample out-tc                                              [ OK ]
 TEST: tc sample out-tc-occ                                          [ OK ]
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bb24d592
    • Ido Schimmel's avatar
      mlxsw: spectrum: Report extra metadata to psample module · 2073c600
      Ido Schimmel authored 
      Make use of the previously added metadata and report it to the psample
module. The metadata is read from the skb's control block, which was
initialized by the bus driver (i.e., 'mlxsw_pci') after decoding the
packet's Completion Queue Element (CQE).
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2073c600
    • Ido Schimmel's avatar
      mlxsw: spectrum: Remove mlxsw_sp_sample_receive() · 48990bef
      Ido Schimmel authored 
      The function resolves the psample sampling group from the Rx port
because this is the only form of sampling the driver currently supports.
Subsequent patches are going to add support for Tx-based and
policy-based sampling, in which case the sampling group would not be
resolved from the Rx port.

Therefore, move this code to the Rx-specific sampling listener.
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      48990bef
    • Ido Schimmel's avatar
      mlxsw: spectrum: Remove unnecessary RCU read-side critical section · e1f78ecd
      Ido Schimmel authored 
      Since commit 7d8e8f34 ("mlxsw: core: Increase scope of RCU read-side
critical section"), all Rx handlers are called from an RCU read-side
critical section.

Remove the unnecessary rcu_read_lock() / rcu_read_unlock().
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e1f78ecd
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