RE: [PATCH 0/8] refactor logic to support secondary process

[Chaoyong He <chaoyong.he@corigine.com>]

> On 4/19/2024 6:23 AM, Chaoyong He wrote:
> > Refactor data structure and related logic to make the secondary
> > process can work as expect.
> >
> 
> Hi Chaoyong,
> 
> Patchset looks good, but I have a question related to the motivation of moving
> so many structs to process private data?
> 
> Normally ethdev is process private, and ethdev->data is shared. Primary
> configures the device and secondary learns shared data and uses it for
> datapath.
> There are cases, like file descriptors for same file can be different for different
> process and process private structure is used.
> 
> In below patches, device private data level structs seems moved to the process
> private structure, is the intention both primary process and secondary process
> do the control path and configuration?
> If so, just a reminder that this is not intended usage of the multi-process
> support and many control APIs are not designed as thread-safe.
> 
> Would you mind describing a little more about your use case that requires
> below process private data changes?

The main motivation of these changes is to solve the problems when customers using the 
secondary process (they use primary process for monitor and secondary process for rx/tx/configuration ...).

The NFP card support different firmware applications, this means we need read message from firmware to 
decide to run which logic.

And with single-pf firmware (this means one PCI BDF address for multi physical ports), we also need 
read message (how many ports totally) from firmware before attach to the primary process.

All this relates with CPP and symbol table, and they are different for primary process and secondary process.
If still put them in the process shared section (ethdev->data), the assignment logic in secondary process will overwrite it 
and cause the primary process crash.

So we move them into the process private section (ethdev->process_private).

> 
> 
> > ---
> > v2:
> > * Solve the build problem.
> > ---
> >
> > Chaoyong He (8):
> >   net/nfp: fix resource leak of secondary process
> >   net/nfp: fix configuration BAR problem
> >   net/nfp: adjust the data field of Rx/Tx queue
> >   net/nfp: add the process private structure
> >   net/nfp: move device info data field
> >   net/nfp: unify CPP acquire method
> >   net/nfp: remove ethernet device data field
> >   net/nfp: unify port create and destroy interface
> >
> >  drivers/net/nfp/flower/nfp_flower.c           | 127 ++++----
> >  drivers/net/nfp/flower/nfp_flower.h           |  11 +-
> >  drivers/net/nfp/flower/nfp_flower_cmsg.c      |   5 +-
> >  drivers/net/nfp/flower/nfp_flower_cmsg.h      |   3 +-
> >  drivers/net/nfp/flower/nfp_flower_ctrl.c      |   8 +-
> >  drivers/net/nfp/flower/nfp_flower_flow.c      |  16 +-
> >  .../net/nfp/flower/nfp_flower_representor.c   | 151 ++++++----
> >  .../net/nfp/flower/nfp_flower_representor.h   |   4 +-
> >  drivers/net/nfp/flower/nfp_flower_service.c   |  32 +-
> >  drivers/net/nfp/flower/nfp_flower_service.h   |  10 +-
> >  drivers/net/nfp/nfd3/nfp_nfd3_dp.c            |   5 +-
> >  drivers/net/nfp/nfdk/nfp_nfdk_dp.c            |   5 +-
> >  drivers/net/nfp/nfp_ethdev.c                  | 274 ++++++++++--------
> >  drivers/net/nfp/nfp_ethdev_vf.c               |  18 +-
> >  drivers/net/nfp/nfp_net_common.c              | 116 ++++----
> >  drivers/net/nfp/nfp_net_common.h              |  30 +-
> >  drivers/net/nfp/nfp_net_flow.c                |  20 +-
> >  drivers/net/nfp/nfp_rxtx.c                    |   9 +-
> >  drivers/net/nfp/nfp_rxtx.h                    |  69 ++---
> >  drivers/net/nfp/nfpcore/nfp6000_pcie.c        |  34 +--
> >  20 files changed, 524 insertions(+), 423 deletions(-)
> >