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Message-ID: <20210209082451.GA44021@jeru.linux.bs1.fc.nec.co.jp>
Date: Tue, 9 Feb 2021 08:24:52 +0000
From: NOMURA JUNICHI(野村 淳一)
<junichi.nomura@....com>
To: "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "ast@...nel.org" <ast@...nel.org>,
"daniel@...earbox.net" <daniel@...earbox.net>,
"toke@...hat.com" <toke@...hat.com>,
NOMURA JUNICHI(野村 淳一)
<junichi.nomura@....com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH bpf] devmap: Use GFP_KERNEL for xdp bulk queue allocation
The devmap bulk queue is allocated with GFP_ATOMIC and the allocation may
fail if there is no available space in existing percpu pool.
Since commit 75ccae62cb8d42 ("xdp: Move devmap bulk queue into struct net_device")
moved the bulk queue allocation to NETDEV_REGISTER callback, whose context
is allowed to sleep, use GFP_KERNEL instead of GFP_ATOMIC to let percpu
allocator extend the pool when needed and avoid possible failure of netdev
registration.
As the required alignment is natural, we can simply use alloc_percpu().
Signed-off-by: Jun'ichi Nomura <junichi.nomura@....com>
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index f6e9c68afdd4..f4d3fe8e0652 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -803,8 +803,7 @@ static int dev_map_notification(struct notifier_block *notifier,
/* will be freed in free_netdev() */
netdev->xdp_bulkq =
- __alloc_percpu_gfp(sizeof(struct xdp_dev_bulk_queue),
- sizeof(void *), GFP_ATOMIC);
+ alloc_percpu(struct xdp_dev_bulk_queue);
if (!netdev->xdp_bulkq)
return NOTIFY_BAD;
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