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Date: Mon, 5 Feb 2024 12:35:15 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
davem@...emloft.net,
kuba@...nel.org,
edumazet@...gle.com,
pabeni@...hat.com,
bpf@...r.kernel.org,
toke@...hat.com,
willemdebruijn.kernel@...il.com,
jasowang@...hat.com,
sdf@...gle.com,
hawk@...nel.org,
ilias.apalodimas@...aro.org,
linyunsheng@...wei.com
Subject: [PATCH v8 net-next 4/4] veth: rely on skb_cow_data_for_xdp utility routine
Rely on skb_cow_data_for_xdp utility routine and remove duplicated
code.
Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>
Reviewed-by: Toke Hoiland-Jorgensen <toke@...hat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/veth.c | 79 +++-------------------------------------------
1 file changed, 5 insertions(+), 74 deletions(-)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 578e36ea1589..a7a541c1a374 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -721,7 +721,8 @@ static void veth_xdp_get(struct xdp_buff *xdp)
static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
struct xdp_buff *xdp,
- struct sk_buff **pskb)
+ struct sk_buff **pskb,
+ struct bpf_prog *prog)
{
struct sk_buff *skb = *pskb;
u32 frame_sz;
@@ -729,80 +730,10 @@ static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
if (skb_shared(skb) || skb_head_is_locked(skb) ||
skb_shinfo(skb)->nr_frags ||
skb_headroom(skb) < XDP_PACKET_HEADROOM) {
- u32 size, len, max_head_size, off, truesize, page_offset;
- struct sk_buff *nskb;
- struct page *page;
- int i, head_off;
- void *va;
-
- /* We need a private copy of the skb and data buffers since
- * the ebpf program can modify it. We segment the original skb
- * into order-0 pages without linearize it.
- *
- * Make sure we have enough space for linear and paged area
- */
- max_head_size = SKB_WITH_OVERHEAD(PAGE_SIZE -
- VETH_XDP_HEADROOM);
- if (skb->len > PAGE_SIZE * MAX_SKB_FRAGS + max_head_size)
- goto drop;
-
- size = min_t(u32, skb->len, max_head_size);
- truesize = SKB_HEAD_ALIGN(size) + VETH_XDP_HEADROOM;
-
- /* Allocate skb head */
- va = page_pool_dev_alloc_va(rq->page_pool, &truesize);
- if (!va)
- goto drop;
-
- nskb = napi_build_skb(va, truesize);
- if (!nskb) {
- page_pool_free_va(rq->page_pool, va, true);
+ if (skb_cow_data_for_xdp(rq->page_pool, pskb, prog))
goto drop;
- }
-
- skb_reserve(nskb, VETH_XDP_HEADROOM);
- skb_copy_header(nskb, skb);
- skb_mark_for_recycle(nskb);
-
- if (skb_copy_bits(skb, 0, nskb->data, size)) {
- consume_skb(nskb);
- goto drop;
- }
- skb_put(nskb, size);
- head_off = skb_headroom(nskb) - skb_headroom(skb);
- skb_headers_offset_update(nskb, head_off);
-
- /* Allocate paged area of new skb */
- off = size;
- len = skb->len - off;
-
- for (i = 0; i < MAX_SKB_FRAGS && off < skb->len; i++) {
- size = min_t(u32, len, PAGE_SIZE);
- truesize = size;
-
- page = page_pool_dev_alloc(rq->page_pool, &page_offset,
- &truesize);
- if (!page) {
- consume_skb(nskb);
- goto drop;
- }
-
- skb_add_rx_frag(nskb, i, page, page_offset, size,
- truesize);
- if (skb_copy_bits(skb, off,
- page_address(page) + page_offset,
- size)) {
- consume_skb(nskb);
- goto drop;
- }
-
- len -= size;
- off += size;
- }
-
- consume_skb(skb);
- skb = nskb;
+ skb = *pskb;
}
/* SKB "head" area always have tailroom for skb_shared_info */
@@ -850,7 +781,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
}
__skb_push(skb, skb->data - skb_mac_header(skb));
- if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb))
+ if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb, xdp_prog))
goto drop;
vxbuf.skb = skb;
--
2.43.0
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