This is a note to let you know that I've just added the patch titled
ixgbe: respect metadata on XSK Rx to skb
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ixgbe-respect-metadata-on-xsk-rx-to-skb.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0af6d1115fa218afea862806ce244721c508c0ee
Author: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
Date: Wed Dec 8 15:07:02 2021 +0100
ixgbe: respect metadata on XSK Rx to skb
[ Upstream commit f322a620be69e95594eda89502b478aa7dbf6ec2 ]
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: d0bcacd0a130 ("ixgbe: add AF_XDP zero-copy Rx support")
Suggested-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@xxxxxxxxxxxxxxx>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@xxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index eec42c907d57..dd7ff66d422f 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -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;
}
