From 02b55e5657c3a569fc681ba851e464cfa6b90d4f Mon Sep 17 00:00:00 2001 From: Björn Töpel Date: Mon, 4 Jun 2018 14:05:54 +0200 Subject: xdp: add MEM_TYPE_ZERO_COPY MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Daniel Borkmann --- include/net/xdp.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/net') 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; -- cgit