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From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Toshiaki Makita <toshiaki.makita1@gmail.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <jakub.kicinski@netronome.com>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>
Cc: Toshiaki Makita <toshiaki.makita1@gmail.com>,
	netdev@vger.kernel.org, xdp-newbies@vger.kernel.org,
	bpf@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>, David Ahern <dsahern@gmail.com>
Subject: Re: [PATCH bpf 3/3] devmap: Add missing RCU read lock on flush
Date: Fri, 14 Jun 2019 13:07:42 +0200
Message-ID: <874l4sctmp.fsf@toke.dk> (raw)
In-Reply-To: <20190614082015.23336-4-toshiaki.makita1@gmail.com>

Toshiaki Makita <toshiaki.makita1@gmail.com> writes:

> .ndo_xdp_xmit() assumes it is called under RCU. For example virtio_net
> uses RCU to detect it has setup the resources for tx. The assumption
> accidentally broke when introducing bulk queue in devmap.
>
> Fixes: 5d053f9da431 ("bpf: devmap prepare xdp frames for bulking")
> Reported-by: David Ahern <dsahern@gmail.com>
> Signed-off-by: Toshiaki Makita <toshiaki.makita1@gmail.com>
> ---

I think this is still needed, but the patch context is going to conflict
with the patch I linked above... I guess it's up to the maintainers to
decide which order to merge them in :)

-Toke

      reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14  8:20 [PATCH bpf 0/3] Devmap fixes around memory and RCU Toshiaki Makita
2019-06-14  8:20 ` [PATCH bpf 1/3] devmap: Fix premature entry free on destroying map Toshiaki Makita
2019-06-14 11:04   ` Toke Høiland-Jørgensen
2019-06-14 12:10     ` Toke Høiland-Jørgensen
2019-06-14 12:59       ` Toshiaki Makita
2019-06-14 13:09         ` Toke Høiland-Jørgensen
2019-06-14 23:07           ` Daniel Borkmann
2019-06-15 10:10             ` Toke Høiland-Jørgensen
2019-06-14 12:20     ` Jesper Dangaard Brouer
2019-06-14  8:20 ` [PATCH bpf 2/3] devmap: Add missing bulk queue free Toshiaki Makita
2019-06-14 11:58   ` Jesper Dangaard Brouer
2019-06-14 13:03     ` Toshiaki Makita
2019-06-14  8:20 ` [PATCH bpf 3/3] devmap: Add missing RCU read lock on flush Toshiaki Makita
2019-06-14 11:07   ` Toke Høiland-Jørgensen [this message]

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