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xdp: add MEM_TYPE_ZERO_COPY

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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>
This commit is contained in:
Björn Töpel
2018-06-04 14:05:54 +02:00
committed by Daniel Borkmann
parent 74515c5750
commit 02b55e5657
2 changed files with 24 additions and 5 deletions
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10
include/net/xdp.h
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@@ -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;