Re: [PATCH net-next 1/4] netlink: truncate overlength attribute list in nla_nest_end()

On Wed, 7 Jun 2023 09:33:24 -0700
Jakub Kicinski [off-list ref] wrote:

quoted

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The problem is basically that attributes can only be 64kB and 
the legacy SR-IOV API wraps all the link info in an attribute.    

Isn't that a second order issue? The skb itself is limited to 32kB AFAICT.  

Hm, you're right. But allocation larger than 32kB are costly.
We can't make every link dump allocate 64kB, it will cause
regressions on systems under memory pressure (== real world).

You'd need to come up with some careful scheme of using larger
buffers.

Why does it all have to be a single message?
Things like 3 million routes are dumped fine, as multiple messages.