On 11/29/2016 03:47 PM, Yuval Mintz wrote:
Add support for the ndo_xdp callback. This patch would support XDP_PASS,
XDP_DROP and XDP_ABORTED commands.
This also adds a per Rx queue statistic which counts number of packets
which didn't reach the stack [due to XDP].
Signed-off-by: Yuval Mintz <yuval.mi...@cavium.com>
[...]
@@ -1560,6 +1593,7 @@ static int qede_rx_process_cqe(struct qede_dev *edev,
struct qede_fastpath *fp,
struct qede_rx_queue *rxq)
{
+ struct bpf_prog *xdp_prog = READ_ONCE(rxq->xdp_prog);
struct eth_fast_path_rx_reg_cqe *fp_cqe;
u16 len, pad, bd_cons_idx, parse_flag;
enum eth_rx_cqe_type cqe_type;
@@ -1596,6 +1630,11 @@ static int qede_rx_process_cqe(struct qede_dev *edev,
len = le16_to_cpu(fp_cqe->len_on_first_bd);
pad = fp_cqe->placement_offset;
+ /* Run eBPF program if one is attached */
+ if (xdp_prog)
+ if (!qede_rx_xdp(edev, fp, rxq, xdp_prog, bd, fp_cqe))
+ return 1;
+
You also need to wrap this under rcu_read_lock() (at least I haven't seen
it in your patches) for same reasons as stated in 326fe02d1ed6 ("net/mlx4_en:
protect ring->xdp_prog with rcu_read_lock"), as otherwise xdp_prog could
disappear underneath you. mlx4 and nfp does it correctly, looks like mlx5
doesn't.
