netdev - New NAPI API: Need for netif_napi

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Date:	Mon, 10 Sep 2007 17:18:22 -0700
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...l.org>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
CC:	NetDev <netdev@...r.kernel.org>
Subject: New NAPI API: Need for netif_napi_remove() ?!

David,

 From an old thread:

 > 5) Since, in the NETPOLL case, netif_napi_init() adds the NAPI struct
 >   to the per-device list I renamed it to netif_napi_add().  Currently
 >   no teardown is really necessary, anything that would need to be done
 >   would be driver internal, so I didn't create the corollary
 >   netif_napi_remove() for the time being.  Let's not add it unless it
 >   really becomes necessary.

while coding the NAPI API changes into the ixgbe driver, I notice that I'm in 
need for an implementation for netif_napi_remove(). The ixgbe driver itself 
already modifies it's polling routing on open() and close() based on whether it 
was able to acquire MSI-X vectors or not, and can thus logically change as the 
system suspends/resumes and new hardware is inserted that change the balance in 
the MSI-X vectors in the system. Or, even more bluntly, all MSI support is 
disabled and we want the driver to come up in legacy mode and use a completely 
different poll routine alltogether. We can't do this at probe time.

In any case I think we have a legitimate case for netif_napi_remove() to be 
implemented.

Auke
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