On 13/12/2022 03.35, Stanislav Fomichev wrote:
The goal is to enable end-to-end testing of the metadata for AF_XDP.
Cc: John Fastabend <john.fastabend@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Martin KaFai Lau <martin.lau@xxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Willem de Bruijn <willemb@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Cc: Anatoly Burakov <anatoly.burakov@xxxxxxxxx>
Cc: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
Cc: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Cc: Maryam Tahhan <mtahhan@xxxxxxxxxx>
Cc: xdp-hints@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Stanislav Fomichev <sdf@xxxxxxxxxx>
---
drivers/net/veth.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 04ffd8cb2945..d5491e7a2798 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -118,6 +118,7 @@ static struct {
struct veth_xdp_buff {
struct xdp_buff xdp;
+ struct sk_buff *skb;
};
static int veth_get_link_ksettings(struct net_device *dev,
@@ -602,6 +603,7 @@ static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq,
xdp_convert_frame_to_buff(frame, xdp);
xdp->rxq = &rq->xdp_rxq;
+ vxbuf.skb = NULL;
act = bpf_prog_run_xdp(xdp_prog, xdp);
@@ -823,6 +825,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
__skb_push(skb, skb->data - skb_mac_header(skb));
if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb))
goto drop;
+ vxbuf.skb = skb;
orig_data = xdp->data;
orig_data_end = xdp->data_end;
@@ -1601,6 +1604,21 @@ static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
}
+static int veth_xdp_rx_timestamp(const struct xdp_md *ctx, u64 *timestamp)
+{
+ *timestamp = ktime_get_mono_fast_ns();
This should be reading the hardware timestamp in the SKB.
Details: This hardware timestamp in the SKB is located in
skb_shared_info area, which is also available for xdp_frame (currently
used for multi-buffer purposes). Thus, when adding xdp-hints "store"
functionality, it would be natural to store the HW TS in the same place.
Making the veth skb/xdp_frame code paths able to share code.
+ return 0;
+}
+
+static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash)
+{
+ struct veth_xdp_buff *_ctx = (void *)ctx;
+
+ if (_ctx->skb)
+ *hash = skb_get_hash(_ctx->skb);
+ return 0;
+}
+
static const struct net_device_ops veth_netdev_ops = {
.ndo_init = veth_dev_init,
.ndo_open = veth_open,
@@ -1622,6 +1640,11 @@ static const struct net_device_ops veth_netdev_ops = {
.ndo_get_peer_dev = veth_peer_dev,
};
+static const struct xdp_metadata_ops veth_xdp_metadata_ops = {
+ .xmo_rx_timestamp = veth_xdp_rx_timestamp,
+ .xmo_rx_hash = veth_xdp_rx_hash,
+};
+
#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
@@ -1638,6 +1661,7 @@ static void veth_setup(struct net_device *dev)
dev->priv_flags |= IFF_PHONY_HEADROOM;
dev->netdev_ops = &veth_netdev_ops;
+ dev->xdp_metadata_ops = &veth_xdp_metadata_ops;
dev->ethtool_ops = &veth_ethtool_ops;
dev->features |= NETIF_F_LLTX;
dev->features |= VETH_FEATURES;
