linux-kernel - Re: [RFC v2 1/2] PCI-Express Non-Transparent Bridge Support

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Message-ID: <CAF8raN6M0_TWyCCzjyXZcFYP=vgFaqQg4hNmNpBxSM+D0C_Bpg@mail.gmail.com>
Date:	Tue, 31 Jul 2012 11:35:33 +0800
From:	Jianbin Kang <kjbmail@...il.com>
To:	Jon Mason <jon.mason@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-pci@...r.kernel.org,
	Dave Jiang <dave.jiang@...el.com>
Subject: Re: [RFC v2 1/2] PCI-Express Non-Transparent Bridge Support

> I've tried to make it all generic enough that non-Intel NTBs should plug in with
> minimal changes to ntb_hw.c.  If their design is too divergent, then a slight
> redesign of ntb_hw.c might be necessary.  But from what I've seen of other
> designs on the internet, they appear to be extremely similar.  The transport and
> client drivers were written with the hardware abstracted away as much as
> possible to prevent the need to modify it for different hardware.  If there is
> anything which is Intel hardware specific, I'd be happy to change it to make it
> more generic.
  In ntb_process_tx(), ntb uses hard-coding 'memcpy_toio' to copy data
to remote.
  Is it better to provide a function pointer like 'tx()' and call qp->tx().
  memcpy_toio is a slow operation. Some hardware can setup a dma
transfer and wait.

  IMHO, the best way is to handle tx in async mode. But it requires
lots of modification.
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