1. 28 Jun, 2019 38 commits
  2. 27 Jun, 2019 2 commits
    • David S. Miller's avatar
      Merge tag 'blk-dim-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux · d7ee2878
      David S. Miller authored
      Saeed Mamameed says:
      
      ====================
      Generic DIM
      
      From: Tal Gilboa and Yamin Fridman
      
      Implement net DIM over a generic DIM library, add RDMA DIM
      
      dim.h lib exposes an implementation of the DIM algorithm for
      dynamically-tuned interrupt moderation for networking interfaces.
      
      We want a similar functionality for other protocols, which might need to
      optimize interrupts differently. Main motivation here is DIM for NVMf
      storage protocol.
      
      Current DIM implementation prioritizes reducing interrupt overhead over
      latency. Also, in order to reduce DIM's own overhead, the algorithm might
      take some time to identify it needs to change profiles. While this is
      acceptable for networking, it might not work well on other scenarios.
      
      Here we propose a new structure to DIM. The idea is to allow a slightly
      modified functionality without the risk of breaking Net DIM behavior for
      netdev. We verified there are no degradations in current DIM behavior with
      the modified solution.
      
      Suggested solution:
      - Common logic is implemented in lib/dim/dim.c
      - Net DIM (existing) logic is implemented in lib/dim/net_dim.c, which uses
        the common logic in dim.c
      - Any new DIM logic will be implemented in "lib/dim/new_dim.c".
        This new implementation will expose modified versions of profiles,
        dim_step() and dim_decision().
      - DIM API is declared in include/linux/dim.h for all implementations.
      
      Pros for this solution are:
      - Zero impact on existing net_dim implementation and usage
      - Relatively more code reuse (compared to two separate solutions)
      - Increased extensibility
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d7ee2878
    • Christian Lamparter's avatar
      net: dsa: qca8k: introduce reset via gpio feature · a653f2f5
      Christian Lamparter authored
      The QCA8337(N) has a RESETn signal on Pin B42 that
      triggers a chip reset if the line is pulled low.
      The datasheet says that: "The active low duration
      must be greater than 10 ms".
      
      This can hopefully fix some of the issues related
      to pin strapping in OpenWrt for the EA8500 which
      suffers from detection issues after a SoC reset.
      
      Please note that the qca8k_probe() function does
      currently require to read the chip's revision
      register for identification purposes.
      Signed-off-by: default avatarChristian Lamparter <chunkeey@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a653f2f5