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Jason Gunthorpe 2ef38e380e Merge tag 'blk-dim-v2' into rdma.git for-next 
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

Required for dependencies in the next series.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-07-08 16:37:21 -03:00
..
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broadcom Merge tag 'blk-dim-v2' into rdma.git for-next 2019-07-08 16:37:21 -03:00
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mediatek SPDX update for 5.2-rc4 2019-06-08 12:52:42 -07:00
mellanox Merge tag 'blk-dim-v2' into rdma.git for-next 2019-07-08 16:37:21 -03:00
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mscc ocelot: Dont allocate another multicast list, use __dev_mc_sync 2019-05-22 12:08:43 -07:00
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realtek r8169: fix MAC address being lost in PCI D3 2019-05-30 11:52:15 -07:00
renesas net: sh_eth: fix mdio access in sh_eth_close() for R-Car Gen2 and RZ/A1 SoCs 2019-05-29 13:24:54 -07:00
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fealnx.c net: fealnx: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profiles 2019-02-13 20:50:42 -08:00
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