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Message-Id: <20211207205536.563550-9-alexandr.lobakin@intel.com>
Date: Tue, 7 Dec 2021 21:55:35 +0100
From: Alexander Lobakin <alexandr.lobakin@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: Alexander Lobakin <alexandr.lobakin@...el.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Björn Töpel <bjorn@...nel.org>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Krzysztof Kazimierczak <krzysztof.kazimierczak@...el.com>,
Jithu Joseph <jithu.joseph@...el.com>,
Andre Guedes <andre.guedes@...el.com>,
Vedang Patel <vedang.patel@...el.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v3 net-next 8/9] ixgbe: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb
{__,}napi_alloc_skb() allocates and reserves additional NET_SKB_PAD
+ NET_IP_ALIGN for any skb.
OTOH, ixgbe_construct_skb_zc() currently allocates and reserves
additional `xdp->data - xdp->data_hard_start`, which is
XDP_PACKET_HEADROOM for XSK frames.
There's no need for that at all as the frame is post-XDP and will
go only to the networking stack core.
Pass the size of the actual data only to __napi_alloc_skb() and
don't reserve anything. This will give enough headroom for stack
processing.
Fixes: d0bcacd0a130 ("ixgbe: add AF_XDP zero-copy Rx support")
Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index 1d74a7980d81..db20dc4c2488 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -214,13 +214,11 @@ static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
struct sk_buff *skb;
/* allocate a skb to store the frags */
- skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
- xdp->data_end - xdp->data_hard_start,
+ skb = __napi_alloc_skb(&rx_ring->q_vector->napi, datasize,
GFP_ATOMIC | __GFP_NOWARN);
if (unlikely(!skb))
return NULL;
- skb_reserve(skb, xdp->data - xdp->data_hard_start);
memcpy(__skb_put(skb, datasize), xdp->data, datasize);
if (metasize)
skb_metadata_set(skb, metasize);
--
2.33.1
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