From: Jun'ichi Nomura <junichi.nomura@xxxxxxx>
[ Upstream commit 7d4553b69fb335496c597c31590e982485ebe071 ]
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().
Fixes: 75ccae62cb8d42 ("xdp: Move devmap bulk queue into struct net_device")
Signed-off-by: Jun'ichi Nomura <junichi.nomura@xxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/20210209082451.GA44021@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/bpf/devmap.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index 2b5ca93c17dec..b5be9659ab590 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -815,9 +815,7 @@ static int dev_map_notification(struct notifier_block *notifier,
break;
/* will be freed in free_netdev() */
- netdev->xdp_bulkq =
- __alloc_percpu_gfp(sizeof(struct xdp_dev_bulk_queue),
- sizeof(void *), GFP_ATOMIC);
+ netdev->xdp_bulkq = alloc_percpu(struct xdp_dev_bulk_queue);
if (!netdev->xdp_bulkq)
return NOTIFY_BAD;
--
2.27.0
