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xdp: implement convert_to_xdp_frame for MEM_TYPE_ZERO_COPY

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This commit adds proper MEM_TYPE_ZERO_COPY support for
convert_to_xdp_frame. Converting a MEM_TYPE_ZERO_COPY xdp_buff to an
xdp_frame is done by transforming the MEM_TYPE_ZERO_COPY buffer into a
MEM_TYPE_PAGE_ORDER0 frame. This is costly, and in the future it might
make sense to implement a more sophisticated thread-safe alloc/free
scheme for MEM_TYPE_ZERO_COPY, so that no allocation and copy is
required in the fast-path.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Björn Töpel
2018-08-29 12:25:53 -07:00
committed by Alexei Starovoitov
parent 7d2c6cfc54
commit b0d1beeff2
2 changed files with 42 additions and 2 deletions
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include/net/xdp.h
+3 -2
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@@ -91,6 +91,8 @@ static inline void xdp_scrub_frame(struct xdp_frame *frame)
frame->dev_rx = NULL;
}
struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp);
/* Convert xdp_buff to xdp_frame */
static inline
struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)
@@ -99,9 +101,8 @@ struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)
int metasize;
int headroom;
/* TODO: implement clone, copy, use "native" MEM_TYPE */
if (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY)
return NULL;
return xdp_convert_zc_to_xdp_frame(xdp);
/* Assure headroom is available for storing info */
headroom = xdp->data - xdp->data_hard_start;