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authorBjörn Töpel <bjorn.topel@intel.com>2018-06-04 14:05:54 +0200
committerDaniel Borkmann <daniel@iogearbox.net>2018-06-05 15:46:26 +0200
commit02b55e5657c3a569fc681ba851e464cfa6b90d4f (patch)
tree6d7665f8ddb9640c9aade3e3cbf3cb5b1e099c60 /include/net/xdp.h
parent74515c5750f30244a901c3c0c82a2fe534b3c9c5 (diff)
xdp: add MEM_TYPE_ZERO_COPY
Here, a new type of allocator support is added to the XDP return API. A zero-copy allocated xdp_buff cannot be converted to an xdp_frame. Instead is the buff has to be copied. This is not supported at all in this commit. Also, an opaque "handle" is added to xdp_buff. This can be used as a context for the zero-copy allocator implementation. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/net/xdp.h')
-rw-r--r--include/net/xdp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/net/xdp.h b/include/net/xdp.h
index a3b71a4dd71d..2deea7166a34 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -37,6 +37,7 @@ enum xdp_mem_type {
MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */
MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */
MEM_TYPE_PAGE_POOL,
+ MEM_TYPE_ZERO_COPY,
MEM_TYPE_MAX,
};
@@ -51,6 +52,10 @@ struct xdp_mem_info {
struct page_pool;
+struct zero_copy_allocator {
+ void (*free)(struct zero_copy_allocator *zca, unsigned long handle);
+};
+
struct xdp_rxq_info {
struct net_device *dev;
u32 queue_index;
@@ -63,6 +68,7 @@ struct xdp_buff {
void *data_end;
void *data_meta;
void *data_hard_start;
+ unsigned long handle;
struct xdp_rxq_info *rxq;
};
@@ -86,6 +92,10 @@ 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;
+
/* Assure headroom is available for storing info */
headroom = xdp->data - xdp->data_hard_start;
metasize = xdp->data - xdp->data_meta;