Introduce multi-buffer bit (mb) in xdp_frame/xdp_buffer data structure
in order to specify if this is a linear buffer (mb = 0) or a multi-buffer
frame (mb = 1). In the latter case the shared_info area at the end of the
first buffer will be properly initialized to link together subsequent
buffers.
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
---
include/net/xdp.h | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/net/xdp.h b/include/net/xdp.h
index a5bc214a49d9..842580a61563 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -73,7 +73,10 @@ struct xdp_buff {
void *data_hard_start;
struct xdp_rxq_info *rxq;
struct xdp_txq_info *txq;
- u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/
+ u32 frame_sz:31; /* frame size to deduce data_hard_end/reserved
+ * tailroom
+ */
+ u32 mb:1; /* xdp non-linear buffer */
};
static __always_inline void
@@ -81,6 +84,7 @@ xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
{
xdp->frame_sz = frame_sz;
xdp->rxq = rxq;
+ xdp->mb = 0;
}
static __always_inline void
@@ -116,7 +120,8 @@ struct xdp_frame {
u16 len;
u16 headroom;
u32 metasize:8;
- u32 frame_sz:24;
+ u32 frame_sz:23;
+ u32 mb:1; /* xdp non-linear frame */
/* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,
* while mem info is valid on remote CPU.
*/
@@ -179,6 +184,7 @@ void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp)
xdp->data_end = frame->data + frame->len;
xdp->data_meta = frame->data - frame->metasize;
xdp->frame_sz = frame->frame_sz;
+ xdp->mb = frame->mb;
}
static inline
@@ -205,6 +211,7 @@ int xdp_update_frame_from_buff(struct xdp_buff *xdp,
xdp_frame->headroom = headroom - sizeof(*xdp_frame);
xdp_frame->metasize = metasize;
xdp_frame->frame_sz = xdp->frame_sz;
+ xdp_frame->mb = xdp->mb;
return 0;
}
--
2.30.2
