| Message ID | 20211207205536.563550-3-alexandr.lobakin@intel.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: intel: napi_alloc_skb() vs metadata | expand |
> -----Original Message----- > From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of > Lobakin, Alexandr > Sent: Wednesday, December 8, 2021 2:25 AM > To: intel-wired-lan@lists.osuosl.org > Cc: Andre Guedes <andre.guedes@intel.com>; Jesper Dangaard Brouer > <hawk@kernel.org>; Daniel Borkmann <daniel@iogearbox.net>; > netdev@vger.kernel.org; Krzysztof Kazimierczak > <krzysztof.kazimierczak@intel.com>; bpf@vger.kernel.org; John Fastabend > <john.fastabend@gmail.com>; Alexei Starovoitov <ast@kernel.org>; Brouer, > Jesper <brouer@redhat.com>; Björn Töpel <bjorn@kernel.org>; Jeff Kirsher > <jeffrey.t.kirsher@intel.com>; Jakub Kicinski <kuba@kernel.org>; linux- > kernel@vger.kernel.org; David S. Miller <davem@davemloft.net>; Vedang > Patel <vedang.patel@intel.com> > Subject: [Intel-wired-lan] [PATCH v3 net-next 2/9] i40e: 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 i40e_costruct_skb(). > > Fixes: 0a714186d3c0 ("i40e: add AF_XDP zero-copy Rx support") > Suggested-by: Jesper Dangaard Brouer <brouer@redhat.com> > Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> > Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com> > Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> > --- > drivers/net/ethernet/intel/i40e/i40e_xsk.c | 14 ++++++++++---- > 1 file changed, 10 insertions(+), 4 deletions(-) > Tested-by: Kiran Bhandare <kiranx.bhandare@intel.com> A Contingent Worker at Intel
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 9564906b7da8..0e8cf275e084 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -240,19 +240,25 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count) static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring, 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)) goto out; - 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); + } out: xsk_buff_free(xdp);
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 i40e_costruct_skb(). Fixes: 0a714186d3c0 ("i40e: add AF_XDP zero-copy Rx support") Suggested-by: Jesper Dangaard Brouer <brouer@redhat.com> Suggested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com> --- drivers/net/ethernet/intel/i40e/i40e_xsk.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)