netdev - Re: [net-next 00/10] net: create dynamic software irq moderation library

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Date:   Fri, 5 Jan 2018 08:48:54 -0500
From:   Andy Gospodarek <andy@...yhouse.net>
To:     Tal Gilboa <talgi@...lanox.com>
Cc:     netdev@...r.kernel.org, mchan@...adcom.com, ogerlitz@...lanox.com,
        Andy Gospodarek <gospo@...adcom.com>
Subject: Re: [net-next 00/10] net: create dynamic software irq moderation
 library

On Fri, Jan 05, 2018 at 10:14:43AM +0200, Tal Gilboa wrote:
> Thanks Andy for your hard work. Looks great overall!
> 
> On 1/4/2018 10:21 PM, Andy Gospodarek wrote:
> > From: Andy Gospodarek <gospo@...adcom.com>
> > 
> > This converts the dynamic interrupt moderation library from the mlx5_en driver
> > into a library so it can be used by any driver.  The penultimatepatch in this
> Had to look up "penultimatepatch " :), but aren't these two words?
> 
> > set adds support for interrupt moderation in the bnxt_en driver and the last
> > patch creates an entry in the MAINTAINERS file.
> > 
> > The main purpose of this code in the mlx5_en driver is to allow an
> > administrator to make sure that default coalesce settings are optimized
> > for low latency, but quickly adapt to handle high throughput traffic and
> > optimize how many packets are received during each napi poll.
> > 
> > For any new driver the following changes would be needed to use this
> > library:
> > 
> > - add elements in ring struct to track items needed by this library
> > - create function that can be called to actually set coalesce settings
> >    for the driver
> > 
> > Credit to Rob Rice and Lee Reed for doing some of the initial proof of
> > concept and testing for this patch and Tal Gilboa and Or Gerlitz for their
> > comments, etc on this set.
> > 
> > Andy Gospodarek (10):
> >    net/mlx5e: move interrupt moderation structs to new file
> >    net/mlx5e: move interrupt moderation forward declarations
> >    net/mlx5e: remove rq references in mlx5e_rx_am
> >    net/mlx5e: move AM logic enums
> >    net/mlx5e: move generic functions to new file
> >    net/mlx5e: change Mellanox references in DIM code
> >    net: move dynamic interrpt coalescing code to include/linux
> interrpt -> interrupt. The topic of the actual patch was fixed, only left in
> the cover.

I'm just going to run ispell on everything again.  :-)

> 
> >    net/dim: use struct net_dim_sample as arg to net_dim
> >    bnxt_en: add support for software dynamic interrupt moderation
> >    MAINTAINERS: add entry for Dynamic Interrupt Moderation
> > 
> >   MAINTAINERS                                        |   5 +
> >   drivers/net/ethernet/broadcom/bnxt/Makefile        |   2 +-
> >   drivers/net/ethernet/broadcom/bnxt/bnxt.c          |  52 +++
> >   drivers/net/ethernet/broadcom/bnxt/bnxt.h          |  34 +-
> >   drivers/net/ethernet/broadcom/bnxt/bnxt_dim.c      |  32 ++
> >   drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c  |  12 +
> >   drivers/net/ethernet/mellanox/mlx5/core/Makefile   |   2 +-
> >   drivers/net/ethernet/mellanox/mlx5/core/en.h       |  46 +--
> >   drivers/net/ethernet/mellanox/mlx5/core/en_dim.c   |  49 +++
> >   .../net/ethernet/mellanox/mlx5/core/en_ethtool.c   |  12 +-
> >   drivers/net/ethernet/mellanox/mlx5/core/en_main.c  |  32 +-
> >   drivers/net/ethernet/mellanox/mlx5/core/en_rep.c   |   4 +-
> >   drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c | 341 -------------------
> >   drivers/net/ethernet/mellanox/mlx5/core/en_txrx.c  |  10 +-
> >   drivers/net/ethernet/mellanox/mlx5/core/net_dim.h  | 108 ++++++
> >   include/linux/mlx5/mlx5_ifc.h                      |   6 -
> >   include/linux/net_dim.h                            | 372 +++++++++++++++++++++
> >   17 files changed, 693 insertions(+), 426 deletions(-)
> >   create mode 100644 drivers/net/ethernet/broadcom/bnxt/bnxt_dim.c
> >   create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_dim.c
> >   delete mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c
> >   create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/net_dim.h
> mlx5/core/net_dim.h was removed from code. Please fix the cover.

Yes, it's odd that this is there.  I'll see if I can figure out why as this
file should have been deleted with patch "net: move dynamic interrpt coalescing
code to include/linux" but it looks like maybe it was not.

> >   create mode 100644 include/linux/net_dim.h
> >