Commit f322a620 authored by Alexander Lobakin's avatar Alexander Lobakin Committed by Tony Nguyen

ixgbe: respect metadata on XSK Rx to skb

For now, if the XDP prog returns XDP_PASS on XSK, the metadata
will be lost as it doesn't get copied to the skb.

Copy it along with the frame headers. Account its size on skb
allocation, and when copying just treat it as a part of the frame
and do a pull after to "move" it to the "reserved" zone.

net_prefetch() xdp->data_meta and align the copy size to speed-up
memcpy() a little and better match ixgbe_construct_skb().

Fixes: d0bcacd0 ("ixgbe: add AF_XDP zero-copy Rx support")
Suggested-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Suggested-by: default avatarMaciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: default avatarAlexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: default avatarMichal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: default avatarSandeep Penigalapati <sandeep.penigalapati@intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 8f405221
......@@ -209,19 +209,25 @@ bool ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
const struct xdp_buff *xdp)
{
unsigned int totalsize = xdp->data_end - xdp->data_meta;
unsigned int metasize = xdp->data - xdp->data_meta;
unsigned int datasize = xdp->data_end - xdp->data;
struct sk_buff *skb;
net_prefetch(xdp->data_meta);
/* allocate a skb to store the frags */
skb = __napi_alloc_skb(&rx_ring->q_vector->napi, datasize,
skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize,
GFP_ATOMIC | __GFP_NOWARN);
if (unlikely(!skb))
return NULL;
memcpy(__skb_put(skb, datasize), xdp->data, datasize);
if (metasize)
memcpy(__skb_put(skb, totalsize), xdp->data_meta,
ALIGN(totalsize, sizeof(long)));
if (metasize) {
skb_metadata_set(skb, metasize);
__skb_pull(skb, metasize);
}
return skb;
}
......
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