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f9e61d365b
mirror_ubuntu-kernels/drivers/net/ethernet/intel
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Alexander Lobakin f9e61d365b igc: 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, igc_construct_skb_zc() currently allocates and reserves
additional `xdp->data_meta - xdp->data_hard_start`, which is about
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 (+ meta) to
__napi_alloc_skb() and don't reserve anything. This will give
enough headroom for stack processing.
Also, net_prefetch() xdp->data_meta and align the copy size to
speed-up memcpy() a little and better match igc_construct_skb().

Fixes: fc9df2a0b5 ("igc: Enable RX via AF_XDP zero-copy")
Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Nechama Kraus <nechamax.kraus@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2022-01-31 09:47:13 -08:00
..
e1000 e1000: switch to napi_build_skb() 2021-12-28 09:42:25 -08:00
e1000e e1000e: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:24 -08:00
fm10k fm10k: Fix syntax errors in comments 2021-12-21 09:17:47 -08:00
i40e i40e: respect metadata on XSK Rx to skb 2022-01-31 09:42:58 -08:00
iavf iavf: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:24 -08:00
ice ice: respect metadata on XSK Rx to skb 2022-01-31 09:46:05 -08:00
igb igb: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:24 -08:00
igbvf igbvf: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:24 -08:00
igc igc: don't reserve excessive XDP_PACKET_HEADROOM on XSK Rx to skb 2022-01-31 09:47:13 -08:00
ixgb ixgb: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:23 -08:00
ixgbe ixgbe: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:23 -08:00
ixgbevf ixgbevf: Remove useless DMA-32 fallback configuration 2022-01-27 08:58:24 -08:00
e100.c ethtool: extend ringparam setting/getting API with rx_buf_len 2021-11-22 12:31:49 +00:00
Kconfig ice: support crosstimestamping on E822 devices if supported 2021-12-21 09:11:40 -08:00
Makefile