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ixgbevf: Add support for meta data

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Add support for XDP meta data when using build skb.

Based on commit 366a88fe2f ("bpf, ixgbe: add meta data support")

Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Tony Nguyen 2018-03-16 15:34:05 -07:00 committed by Jeff Kirsher
parent efecfd5f80
commit be8333322e
1 changed files with 25 additions and 4 deletions
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29
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
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@ -889,6 +889,20 @@ struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
#if L1_CACHE_BYTES < 128
prefetch(xdp->data + L1_CACHE_BYTES);
#endif
/* Note, we get here by enabling legacy-rx via:
*
* ethtool --set-priv-flags <dev> legacy-rx on
*
* In this mode, we currently get 0 extra XDP headroom as
* opposed to having legacy-rx off, where we process XDP
* packets going to stack via ixgbevf_build_skb().
*
* For ixgbevf_construct_skb() mode it means that the
* xdp->data_meta will always point to xdp->data, since
* the helper cannot expand the head. Should this ever
* changed in future for legacy-rx mode on, then lets also
* add xdp->data_meta handling here.
*/
/* allocate a skb to store the frags */
skb = napi_alloc_skb(&rx_ring->q_vector->napi, IXGBEVF_RX_HDR_SIZE);
@ -936,6 +950,7 @@ static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
struct xdp_buff *xdp,
union ixgbe_adv_rx_desc *rx_desc)
{
unsigned int metasize = xdp->data - xdp->data_meta;
#if (PAGE_SIZE < 8192)
unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
@ -945,10 +960,14 @@ static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
#endif
struct sk_buff *skb;
/* prefetch first cache line of first page */
prefetch(xdp->data);
/* Prefetch first cache line of first page. If xdp->data_meta
* is unused, this points to xdp->data, otherwise, we likely
* have a consumer accessing first few bytes of meta data,
* and then actual data.
*/
prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
prefetch(xdp->data + L1_CACHE_BYTES);
prefetch(xdp->data_meta + L1_CACHE_BYTES);
#endif
/* build an skb around the page buffer */
@ -959,6 +978,8 @@ static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
/* update pointers within the skb to store the data */
skb_reserve(skb, xdp->data - xdp->data_hard_start);
__skb_put(skb, xdp->data_end - xdp->data);
if (metasize)
skb_metadata_set(skb, metasize);
/* update buffer offset */
#if (PAGE_SIZE < 8192)
@ -1126,7 +1147,7 @@ static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
if (!skb) {
xdp.data = page_address(rx_buffer->page) +
rx_buffer->page_offset;
xdp_set_data_meta_invalid(&xdp);
xdp.data_meta = xdp.data;
xdp.data_hard_start = xdp.data -
ixgbevf_rx_offset(rx_ring);
xdp.data_end = xdp.data + size;