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Date:   Tue, 07 Jan 2020 19:45:15 -0800
From:   John Fastabend <>
To:     Toke Høiland-Jørgensen <>,
        John Fastabend <>,
        Björn Töpel <>,,,
Cc:     Björn Töpel <>,,,,,,,
Subject: RE: [PATCH bpf-next v2 7/8] xdp: remove map_to_flush and map swap

Toke Høiland-Jørgensen wrote:
> John Fastabend <> writes:
> > Björn Töpel wrote:
> >> From: Björn Töpel <>
> >> 
> >> Now that all XDP maps that can be used with bpf_redirect_map() tracks
> >> entries to be flushed in a global fashion, there is not need to track
> >> that the map has changed and flush from xdp_do_generic_map()
> >> anymore. All entries will be flushed in xdp_do_flush_map().
> >> 
> >> This means that the map_to_flush can be removed, and the corresponding
> >> checks. Moving the flush logic to one place, xdp_do_flush_map(), give
> >> a bulking behavior and performance boost.
> >> 
> >> Acked-by: Toke Høiland-Jørgensen <>
> >> Signed-off-by: Björn Töpel <>
> >> ---
> >
> > __dev_map_flush() still has rcu_read_lock/unlock() around flush_list by
> > this point, assuming I've followed along correctly. Can we drop those
> > now seeing its per CPU and all list ops are per-cpu inside napi context?
> Hmm, I guess so? :)
> > Two reasons to consider, with this patch dev_map_flush() is always
> > called even if the list is empty so even in TX case without redirect.
> > But probably more important it makes the locking requirements more clear.
> > Could probably be done in a follow up patch but wanted to bring it up.
> This series was already merged, but I'll follow up with the non-map
> redirect change. This requires a bit of refactoring anyway, so I can
> incorporate the lock removal into that...
> -Toke

Ah I was just catching up with email and missed itwas already applied.

I can also submit a few fixup patches no problem for the comments and this.


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