netdev - [PATCH net-next 03/10] bpf: mlx5e: Report bpf_prog ID during XDP_QUERY

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Date:   Mon, 12 Jun 2017 18:00:18 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net-next 03/10] bpf: mlx5e: Report bpf_prog ID during XDP_QUERY_PROG

Add support to mlx5e to report bpf_prog ID during XDP_QUERY_PROG.

Signed-off-by: Martin KaFai Lau <kafai@...com>
Cc: Tariq Toukan <tariqt@...lanox.com>
Cc: Saeed Mahameed <saeedm@...lanox.com>
Acked-by: Alexei Starovoitov <ast@...com>
Acked-by: Daniel Borkmann <daniel@...earbox.net>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 5afec0f4a658..c3ed2e122e12 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3599,11 +3599,19 @@ static int mlx5e_xdp_set(struct net_device *netdev, struct bpf_prog *prog)
 	return err;
 }
 
-static bool mlx5e_xdp_attached(struct net_device *dev)
+static u32 mlx5e_xdp_query(struct net_device *dev)
 {
+	const struct bpf_prog *xdp_prog;
 	struct mlx5e_priv *priv = netdev_priv(dev);
+	u32 prog_id = 0;
 
-	return !!priv->channels.params.xdp_prog;
+	mutex_lock(&priv->state_lock);
+	xdp_prog = READ_ONCE(priv->channels.params.xdp_prog);
+	if (xdp_prog)
+		prog_id = xdp_prog->aux->id;
+	mutex_unlock(&priv->state_lock);
+
+	return prog_id;
 }
 
 static int mlx5e_xdp(struct net_device *dev, struct netdev_xdp *xdp)
@@ -3612,7 +3620,7 @@ static int mlx5e_xdp(struct net_device *dev, struct netdev_xdp *xdp)
 	case XDP_SETUP_PROG:
 		return mlx5e_xdp_set(dev, xdp->prog);
 	case XDP_QUERY_PROG:
-		xdp->prog_attached = mlx5e_xdp_attached(dev);
+		xdp->prog_id = mlx5e_xdp_query(dev);
 		return 0;
 	default:
 		return -EINVAL;
-- 
2.9.3