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authorJesper Dangaard Brouer <brouer@redhat.com>2018-04-17 17:45:42 +0300
committerDavid S. Miller <davem@davemloft.net>2018-04-17 17:50:28 +0300
commitc0048cff8abb69c956ce1277d17a3f7a14e41522 (patch)
tree30e0e8fad3cb65ead555c2bef92f9e8632ca37cf
parent106ca27f2922e8de820d1bd3d79b1cbdf2d78eea (diff)
downloadlinux-c0048cff8abb69c956ce1277d17a3f7a14e41522.tar.xz
xdp: introduce a new xdp_frame type
This is needed to convert drivers tuntap and virtio_net. This is a generalization of what is done inside cpumap, which will be converted later. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/xdp.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 15f8ade008b5..756c42811e78 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -58,6 +58,46 @@ struct xdp_buff {
struct xdp_rxq_info *rxq;
};
+struct xdp_frame {
+ void *data;
+ u16 len;
+ u16 headroom;
+ u16 metasize;
+ /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,
+ * while mem info is valid on remote CPU.
+ */
+ struct xdp_mem_info mem;
+};
+
+/* Convert xdp_buff to xdp_frame */
+static inline
+struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)
+{
+ struct xdp_frame *xdp_frame;
+ int metasize;
+ int headroom;
+
+ /* Assure headroom is available for storing info */
+ headroom = xdp->data - xdp->data_hard_start;
+ metasize = xdp->data - xdp->data_meta;
+ metasize = metasize > 0 ? metasize : 0;
+ if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))
+ return NULL;
+
+ /* Store info in top of packet */
+ xdp_frame = xdp->data_hard_start;
+
+ xdp_frame->data = xdp->data;
+ xdp_frame->len = xdp->data_end - xdp->data;
+ xdp_frame->headroom = headroom - sizeof(*xdp_frame);
+ xdp_frame->metasize = metasize;
+
+ /* rxq only valid until napi_schedule ends, convert to xdp_mem_info */
+ xdp_frame->mem = xdp->rxq->mem;
+
+ return xdp_frame;
+}
+
static inline
void xdp_return_frame(void *data, struct xdp_mem_info *mem)
{