diff options
| author | Ong Boon Leong <boon.leong.ong@intel.com> | 2021-03-31 16:25:03 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-04-01 01:15:23 +0300 |
| commit | 622d13694b5f048c01caa7ba548498d9880d4cb0 (patch) | |
| tree | 1c33751ca3d24ab7507578ddf0ef1713110dc85b /drivers | |
| parent | c609e6aae4efcf383fe86b195d1b060befcb3666 (diff) | |
| download | linux-622d13694b5f048c01caa7ba548498d9880d4cb0.tar.xz | |
xdp: fix xdp_return_frame() kernel BUG throw for page_pool memory model
xdp_return_frame() may be called outside of NAPI context to return
xdpf back to page_pool. xdp_return_frame() calls __xdp_return() with
napi_direct = false. For page_pool memory model, __xdp_return() calls
xdp_return_frame_no_direct() unconditionally and below false negative
kernel BUG throw happened under preempt-rt build:
[ 430.450355] BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/3884
[ 430.451678] caller is __xdp_return+0x1ff/0x2e0
[ 430.452111] CPU: 0 PID: 3884 Comm: modprobe Tainted: G U E 5.12.0-rc2+ #45
Changes in v2:
- This patch fixes the issue by making xdp_return_frame_no_direct() is
only called if napi_direct = true, as recommended for better by
Jesper Dangaard Brouer. Thanks!
Fixes: 2539650fadbf ("xdp: Helpers for disabling napi_direct of xdp_return_frame")
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions