Re: [PATCH net-next 08/10] bpf: nfp: Report bpf_prog ID during XDP_QUERY_PROG
flat view
From: Jakub Kicinski <hidden>
Date: 2017-06-13 01:28:46
On Mon, 12 Jun 2017 18:00:23 -0700, Martin KaFai Lau wrote:
quoted hunk ↗ jump to hunk
+ case XDP_QUERY_PROG: { + const struct bpf_prog *xdp_prog; + + xdp_prog = READ_ONCE(nn->dp.xdp_prog); + if (xdp_prog) + xdp->prog_id = xdp_prog->aux->id; + else + xdp->prog_id = 0; return 0; + } default: return -EINVAL; }
Why READ_ONCE? I thought .ndo_xdp is always called under RTNL.