On 2017年09月28日 20:57, Jesper Dangaard Brouer wrote:
+};
+
+/* Convert xdp_buff to xdp_pkt */
+static struct xdp_pkt *convert_to_xdp_pkt(struct xdp_buff *xdp)
+{
+ struct xdp_pkt *xdp_pkt;
+ int headroom;
+
+ /* Assure headroom is available for storing info */
+ headroom = xdp->data - xdp->data_hard_start;
+ if (headroom < sizeof(*xdp_pkt))
+ return NULL;
Hi Jesper:
Do you consider this as a trick or a long term solution? Is it better to
store XDP in a circular buffer? (I'm asking since I meet similar issue
when doing xdp_xmit for tun).
+
+ /* Store info in top of packet */
+ xdp_pkt = xdp->data_hard_start;
+
+ xdp_pkt->data = xdp->data;
+ xdp_pkt->len = xdp->data_end - xdp->data;
+ xdp_pkt->headroom = headroom - sizeof(*xdp_pkt);
+
Is wmb() needed here?
+ return xdp_pkt;
+}
Thanks
