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Message-ID: <ae79fc09-d7bb-5dda-4df4-324900a10196@itcare.pl>
Date: Tue, 12 Sep 2017 00:11:21 +0200
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: Paolo Abeni <pabeni@...hat.com>,
Jesper Dangaard Brouer <brouer@...hat.com>,
Linux Kernel Network Developers <netdev@...r.kernel.org>,
Alexander Duyck <alexander.duyck@...il.com>
Subject: Re: Kernel 4.13.0-rc4-next-20170811 - IP Routing / Forwarding
performance vs Core/RSS number / HT on
Another test for this patch with linux-next tree
with patch:
bwm-ng v0.6.1 (probing every 1.000s), press 'h' for help
input: /proc/net/dev type: rate
- iface Rx Tx Total
==============================================================================
vlan1004: 1.00 P/s 606842.31 P/s 606843.31 P/s
lo: 0.00 P/s 0.00 P/s
0.00 P/s
vlan1016: 0.00 P/s 607730.56 P/s 607730.56 P/s
vlan1020: 0.00 P/s 606891.25 P/s 606891.25 P/s
vlan1018: 0.00 P/s 607580.88 P/s 607580.88 P/s
vlan1014: 0.00 P/s 607606.81 P/s 607606.81 P/s
vlan1005: 0.00 P/s 606788.44 P/s 606788.44 P/s
enp2s0f0: 2.00 P/s 2.00 P/s
3.99 P/s
vlan1017: 0.00 P/s 607643.75 P/s 607643.75 P/s
enp132s0: 13079658.00 P/s 0.00 P/s 13079658.00 P/s
vlan1000: 0.00 P/s 604409.19 P/s 604409.19 P/s
vlan1010: 0.00 P/s 606984.06 P/s 606984.06 P/s
vlan1019: 0.00 P/s 607452.12 P/s 607452.12 P/s
vlan1008: 0.00 P/s 606803.44 P/s 606803.44 P/s
vlan1011: 0.00 P/s 607048.94 P/s 607048.94 P/s
vlan1001: 0.00 P/s 606773.50 P/s 606773.50 P/s
vlan1006: 0.00 P/s 606811.38 P/s 606811.38 P/s
vlan1012: 0.00 P/s 607051.94 P/s 607051.94 P/s
vlan1013: 0.00 P/s 607067.88 P/s 607067.88 P/s
enp4s0: 2.00 P/s 13020803.00 P/s 13020805.00 P/s
vlan1007: 0.00 P/s 606798.44 P/s 606798.44 P/s
vlan1002: 0.00 P/s 606840.31 P/s 606840.31 P/s
vlan1009: 0.00 P/s 606809.38 P/s 606809.38 P/s
enp2s0f1: 100.80 P/s 0.00 P/s
100.80 P/s
vlan1015: 0.00 P/s 607089.81 P/s 607089.81 P/s
vlan1003: 1.00 P/s 606928.19 P/s 606929.19 P/s
------------------------------------------------------------------------------
total: 13079765.00 P/s 25766758.00 P/s 38846524.00 P/s
13Mpps forwarded (32cores active for two mlx5 nics)
80% cpu load (20%idle all cores)
PerfTop: 126552 irqs/sec kernel:99.3% exact: 0.0% [4000Hz
cycles], (all, 32 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
8.25% [kernel] [k] fib_table_lookup
7.98% [kernel] [k] do_raw_spin_lock
6.20% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
4.21% [kernel] [k] mlx5e_xmit
3.37% [kernel] [k] __dev_queue_xmit
2.95% [kernel] [k] ip_rcv
2.72% [kernel] [k] ipt_do_table
2.24% [kernel] [k] ip_finish_output2
2.22% [kernel] [k] __netif_receive_skb_core
2.17% [kernel] [k] ip_forward
2.15% [kernel] [k] __build_skb
1.99% [kernel] [k] ip_route_input_rcu
1.70% [kernel] [k] mlx5e_txwqe_complete
1.54% [kernel] [k] dev_gro_receive
1.45% [kernel] [k] mlx5_cqwq_get_cqe
1.38% [kernel] [k] udp_v4_early_demux
1.35% [kernel] [k] netif_skb_features
1.33% [kernel] [k] inet_gro_receive
1.29% [kernel] [k] dev_hard_start_xmit
1.27% [kernel] [k] ip_rcv_finish
1.19% [kernel] [k] mlx5e_build_rx_skb
1.15% [kernel] [k] __netdev_pick_tx
1.11% [kernel] [k] kmem_cache_alloc
1.09% [kernel] [k] mlx5e_poll_tx_cq
1.07% [kernel] [k] mlx5e_txwqe_build_dsegs
1.00% [kernel] [k] vlan_dev_hard_start_xmit
0.90% [kernel] [k] __napi_alloc_skb
0.87% [kernel] [k] validate_xmit_skb
0.87% [kernel] [k] read_tsc
0.83% [kernel] [k] napi_gro_receive
0.79% [kernel] [k] skb_network_protocol
0.79% [kernel] [k] sch_direct_xmit
0.78% [kernel] [k] __local_bh_enable_ip
0.78% [kernel] [k] netdev_pick_tx
0.75% [kernel] [k] __udp4_lib_lookup
0.72% [kernel] [k] netif_receive_skb_internal
0.71% [kernel] [k] page_frag_free
0.71% [kernel] [k] deliver_ptype_list_skb
0.70% [kernel] [k] fib_validate_source
0.69% [kernel] [k] mlx5_cqwq_get_cqe
0.69% [kernel] [k] __netif_receive_skb
0.68% [kernel] [k] vlan_passthru_hard_header
0.61% [kernel] [k] rt_cache_valid
0.59% [kernel] [k] iptable_filter_hook
Without patch:
12,7Mpps forwarded (32cores active for two mlx5 nics)
100% cpu load ( rx drops on receiving side )
TX is about 13.05Mpps from pktgen
bwm-ng v0.6.1 (probing every 1.000s), press 'h' for help
input: /proc/net/dev type: rate
/ iface Rx Tx Total
==============================================================================
vlan1004: 0.00 P/s 589709.31 P/s 589709.31 P/s
lo: 0.00 P/s 0.00 P/s
0.00 P/s
vlan1016: 0.00 P/s 589495.50 P/s 589495.50 P/s
vlan1020: 0.00 P/s 589968.06 P/s 589968.06 P/s
vlan1018: 0.00 P/s 589896.12 P/s 589896.12 P/s
vlan1014: 0.00 P/s 589496.50 P/s 589496.50 P/s
vlan1005: 0.00 P/s 589502.50 P/s 589502.50 P/s
enp2s0f0: 42.96 P/s 2.00 P/s
44.96 P/s
vlan1017: 0.00 P/s 589508.50 P/s 589508.50 P/s
enp132s0: 12700689.00 P/s 0.00 P/s 12700689.00 P/s
vlan1000: 0.00 P/s 587671.38 P/s 587671.38 P/s
vlan1010: 0.00 P/s 589330.69 P/s 589330.69 P/s
vlan1019: 0.00 P/s 589808.19 P/s 589808.19 P/s
vlan1008: 0.00 P/s 589283.75 P/s 589283.75 P/s
vlan1011: 0.00 P/s 589482.56 P/s 589482.56 P/s
vlan1001: 0.00 P/s 589971.06 P/s 589971.06 P/s
vlan1006: 0.00 P/s 589785.25 P/s 589785.25 P/s
vlan1012: 0.00 P/s 589494.50 P/s 589494.50 P/s
vlan1013: 0.00 P/s 589495.50 P/s 589495.50 P/s
enp4s0: 0.00 P/s 12601841.00 P/s 12601841.00 P/s
vlan1007: 0.00 P/s 589537.50 P/s 589537.50 P/s
vlan1002: 0.00 P/s 589943.06 P/s 589943.06 P/s
vlan1009: 0.00 P/s 589306.69 P/s 589306.69 P/s
enp2s0f1: 99.90 P/s 0.00 P/s
99.90 P/s
vlan1015: 0.00 P/s 589553.44 P/s 589553.44 P/s
vlan1003: 0.00 P/s 589823.19 P/s 589823.19 P/s
------------------------------------------------------------------------------
total: 12700832.00 P/s 24981906.00 P/s 37682740.00 P/s
PerfTop: 124056 irqs/sec kernel:99.3% exact: 0.0% [4000Hz
cycles], (all, 32 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
7.77% [kernel] [k] fib_table_lookup
7.37% [kernel] [k] do_raw_spin_lock
5.43% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
3.84% [kernel] [k] mlx5e_xmit
3.52% [kernel] [k] rt_cache_valid
3.46% [kernel] [k] ip_finish_output2
3.45% [kernel] [k] skb_dst_force
2.96% [kernel] [k] dst_release
2.62% [kernel] [k] __dev_queue_xmit
2.54% [kernel] [k] ip_rcv
2.26% [kernel] [k] ipt_do_table
1.97% [kernel] [k] __build_skb
1.94% [kernel] [k] __netif_receive_skb_core
1.94% [kernel] [k] ip_route_input_rcu
1.83% [kernel] [k] ip_forward
1.52% [kernel] [k] mlx5e_txwqe_complete
1.42% [kernel] [k] dev_gro_receive
1.31% [kernel] [k] mlx5_cqwq_get_cqe
1.28% [kernel] [k] netif_skb_features
1.21% [kernel] [k] ip_rcv_finish
1.18% [kernel] [k] inet_gro_receive
1.17% [kernel] [k] udp_v4_early_demux
1.14% [kernel] [k] dev_hard_start_xmit
1.03% [kernel] [k] mlx5e_txwqe_build_dsegs
1.02% [kernel] [k] mlx5e_poll_tx_cq
1.02% [kernel] [k] mlx5e_build_rx_skb
1.00% [kernel] [k] kmem_cache_alloc
0.95% [kernel] [k] __netdev_pick_tx
0.93% [kernel] [k] vlan_dev_hard_start_xmit
0.82% [kernel] [k] __napi_alloc_skb
0.79% [kernel] [k] read_tsc
0.76% [kernel] [k] validate_xmit_skb
0.75% [kernel] [k] napi_gro_receive
0.71% [kernel] [k] __local_bh_enable_ip
0.70% [kernel] [k] sch_direct_xmit
0.67% [kernel] [k] page_frag_free
0.66% [kernel] [k] skb_network_protocol
0.66% [kernel] [k] nf_hook_slow
0.63% [kernel] [k] netif_receive_skb_internal
0.62% [kernel] [k] vlan_passthru_hard_header
0.62% [kernel] [k] deliver_ptype_list_skb
0.62% [kernel] [k] __netif_receive_skb
0.61% [kernel] [k] fib_validate_source
0.61% [kernel] [k] mlx5_cqwq_get_cqe
0.55% [kernel] [k] eth_type_trans
0.55% [kernel] [k] iptable_filter_hook
0.53% [kernel] [k] __udp4_lib_lookup
0.53% [kernel] [k] udp_gro_receive
0.51% [kernel] [k] eth_header
0.49% [kernel] [k] fib_lookup.constprop.49
0.48% [kernel] [k] ip_output
0.44% [kernel] [k] netdev_pick_tx
0.43% [kernel] [k] validate_xmit_skb_list
0.42% [kernel] [k] swiotlb_map_page
0.41% [kernel] [k] dma_sync_single_for_cpu.constprop.36
0.41% [kernel] [k] mlx5_cqwq_get_wqe
0.39% [kernel] [k] eth_type_vlan
0.38% [kernel] [k] udp4_gro_receive
0.37% [kernel] [k] __jhash_nwords
0.37% [kernel] [k] ip_forward_finish
0.33% [kernel] [k] ip_finish_output
0.33% [kernel] [k] neigh_connected_output
0.31% [kernel] [k] mlx5e_features_check
0.29% [kernel] [k] ktime_get_with_offset
0.27% [kernel] [k] __udp4_lib_lookup_skb
0.27% [kernel] [k] napi_consume_skb
0.26% [kernel] [k] page_frag_alloc
0.26% [kernel] [k] get_dma_ops
0.25% [kernel] [k] udp4_portaddr_hash.isra.29
0.24% [kernel] [k] skb_dst_drop.isra.76
0.24% [kernel] [k] neigh_resolve_output
0.24% [kernel] [k] skb_release_data
0.22% [kernel] [k] kmem_cache_free_bulk
0.22% [kernel] [k] get_dma_ops
0.22% [kernel] [k] _kfree_skb_defer
0.21% [kernel] [k] ip_skb_dst_mtu
0.21% [kernel] [k] is_swiotlb_buffer
0.21% [kernel] [k] find_exception
0.21% [kernel] [k] compound_head
0.21% [kernel] [k] __net_timestamp.isra.89
W dniu 2017-09-11 o 18:57, Paweł Staszewski pisze:
> Tested with connectx-5
>
> Without patch
>
> 10Mpps - > 16 cores used
>
> PerfTop: 66258 irqs/sec kernel:99.3% exact: 0.0% [4000Hz
> cycles], (all, 32 CPUs)
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
> 10.12% [kernel] [k] do_raw_spin_lock
> 6.31% [kernel] [k] fib_table_lookup
> 6.12% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
> 4.90% [kernel] [k] rt_cache_valid
> 3.99% [kernel] [k] mlx5e_xmit
> 3.03% [kernel] [k] ip_rcv
> 2.68% [kernel] [k] __netif_receive_skb_core
> 2.54% [kernel] [k] skb_dst_force
> 2.41% [kernel] [k] ip_finish_output2
> 2.21% [kernel] [k] __build_skb
> 2.03% [kernel] [k] __dev_queue_xmit
> 1.96% [kernel] [k] mlx5e_txwqe_complete
> 1.79% [kernel] [k] ipt_do_table
> 1.78% [kernel] [k] inet_gro_receive
> 1.69% [kernel] [k] ip_forward
> 1.66% [kernel] [k] udp_v4_early_demux
> 1.65% [kernel] [k] dst_release
> 1.56% [kernel] [k] ip_rcv_finish
> 1.45% [kernel] [k] dev_gro_receive
> 1.45% [kernel] [k] netif_skb_features
> 1.39% [kernel] [k] mlx5e_poll_tx_cq
> 1.35% [kernel] [k] mlx5e_txwqe_build_dsegs
> 1.35% [kernel] [k] ip_route_input_rcu
> 1.15% [kernel] [k] dev_hard_start_xmit
> 1.12% [kernel] [k] napi_gro_receive
> 1.07% [kernel] [k] netif_receive_skb_internal
> 0.98% [kernel] [k] sch_direct_xmit
> 0.95% [kernel] [k] kmem_cache_alloc
> 0.89% [kernel] [k] read_tsc
> 0.88% [kernel] [k] mlx5e_build_rx_skb
> 0.86% [kernel] [k] mlx5_cqwq_get_cqe
> 0.82% [kernel] [k] page_frag_free
> 0.78% [kernel] [k] __local_bh_enable_ip
> 0.69% [kernel] [k] skb_network_protocol
> 0.68% [kernel] [k] __netif_receive_skb
> 0.67% [kernel] [k] vlan_dev_hard_start_xmit
> 0.65% [kernel] [k] mlx5e_poll_rx_cq
> 0.65% [kernel] [k] validate_xmit_skb
> 0.60% [kernel] [k] eth_type_trans
> 0.60% [kernel] [k] deliver_ptype_list_skb
> 0.60% [kernel] [k] fib_validate_source
> 0.55% [kernel] [k] eth_header
> 0.53% [kernel] [k] netdev_pick_tx
> 0.53% [kernel] [k] __napi_alloc_skb
> 0.51% [kernel] [k] __udp4_lib_lookup
> 0.50% [kernel] [k] eth_type_vlan
> 0.49% [kernel] [k] ip_output
> 0.49% [kernel] [k] page_frag_alloc
> 0.49% [kernel] [k] ip_finish_output
> 0.48% [kernel] [k] neigh_connected_output
> 0.45% [kernel] [k] nf_hook_slow
> 0.44% [kernel] [k] udp4_gro_receive
> 0.39% [kernel] [k] mlx5e_features_check
> 0.39% [kernel] [k] mlx5e_napi_poll
> 0.37% [kernel] [k] __jhash_nwords
> 0.37% [kernel] [k] udp_gro_receive
> 0.36% [kernel] [k] swiotlb_map_page
> 0.33% [kernel] [k] mlx5_cqwq_get_wqe
> 0.33% [kernel] [k] __netdev_pick_tx
> 0.29% [kernel] [k] ktime_get_with_offset
> 0.29% [kernel] [k] get_dma_ops
> 0.29% [kernel] [k] validate_xmit_skb_list
> 0.26% [kernel] [k] vlan_passthru_hard_header
> 0.26% [kernel] [k] __udp4_lib_lookup_skb
> 0.24% [kernel] [k] get_dma_ops
> 0.24% [kernel] [k] skb_release_data
> 0.23% [kernel] [k] ip_forward_finish
> 0.23% [kernel] [k] kmem_cache_free_bulk
> 0.23% [kernel] [k] timekeeping_get_ns
> 0.22% [kernel] [k] ip_skb_dst_mtu
> 0.21% [kernel] [k] compound_head
> 0.20% [kernel] [k] skb_gro_reset_offset
> 0.20% [kernel] [k] is_swiotlb_buffer
> 0.19% [kernel] [k] __net_timestamp.isra.90
> 0.19% [kernel] [k] dst_metric.constprop.61
> 0.18% [kernel] [k] skb_orphan_frags.constprop.126
> 0.18% [kernel] [k] _kfree_skb_defer
> 0.18% [kernel] [k] irq_entries_start
> 0.17% [kernel] [k] dev_hard_header.constprop.54
> 0.17% [kernel] [k] dma_mapping_error
> 0.17% [kernel] [k] neigh_resolve_output
>
>
>
>
> With patch
>
> 12Mpps -> 16 cores
>
> PerfTop: 66209 irqs/sec kernel:99.3% exact: 0.0% [4000Hz
> cycles], (all, 32 CPUs)
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>
> 10.67% [kernel] [k] do_raw_spin_lock
> 6.96% [kernel] [k] fib_table_lookup
> 6.53% [kernel] [k] mlx5e_handle_rx_cqe_mpwrq
> 4.17% [kernel] [k] mlx5e_xmit
> 3.22% [kernel] [k] ip_rcv
> 3.07% [kernel] [k] __netif_receive_skb_core
> 2.86% [kernel] [k] __dev_queue_xmit
> 2.36% [kernel] [k] __build_skb
> 2.33% [kernel] [k] ip_forward
> 2.05% [kernel] [k] mlx5e_txwqe_complete
> 2.02% [kernel] [k] ip_finish_output2
> 2.00% [kernel] [k] ipt_do_table
> 1.84% [kernel] [k] ip_rcv_finish
> 1.83% [kernel] [k] inet_gro_receive
> 1.80% [kernel] [k] udp_v4_early_demux
> 1.61% [kernel] [k] dev_gro_receive
> 1.55% [kernel] [k] netif_skb_features
> 1.52% [kernel] [k] mlx5e_txwqe_build_dsegs
> 1.47% [kernel] [k] mlx5e_poll_tx_cq
> 1.39% [kernel] [k] ip_route_input_rcu
> 1.38% [kernel] [k] dev_hard_start_xmit
> 1.17% [kernel] [k] netif_receive_skb_internal
> 1.16% [kernel] [k] napi_gro_receive
> 1.03% [kernel] [k] kmem_cache_alloc
> 1.02% [kernel] [k] sch_direct_xmit
> 0.97% [kernel] [k] read_tsc
> 0.94% [kernel] [k] page_frag_free
> 0.91% [kernel] [k] mlx5_cqwq_get_cqe
> 0.90% [kernel] [k] mlx5e_build_rx_skb
> 0.89% [kernel] [k] skb_network_protocol
> 0.83% [kernel] [k] __local_bh_enable_ip
> 0.79% [kernel] [k] validate_xmit_skb
> 0.77% [kernel] [k] vlan_dev_hard_start_xmit
> 0.74% [kernel] [k] __netif_receive_skb
> 0.72% [kernel] [k] mlx5e_poll_rx_cq
> 0.70% [kernel] [k] netdev_pick_tx
> 0.69% [kernel] [k] eth_type_vlan
> 0.68% [kernel] [k] __netdev_pick_tx
> 0.66% [kernel] [k] nf_hook_slow
> 0.65% [kernel] [k] deliver_ptype_list_skb
> 0.62% [kernel] [k] fib_validate_source
> 0.61% [kernel] [k] eth_header
> 0.60% [kernel] [k] eth_type_trans
> 0.59% [kernel] [k] __udp4_lib_lookup
> 0.58% [kernel] [k] __napi_alloc_skb
> 0.53% [kernel] [k] ip_finish_output
> 0.51% [kernel] [k] neigh_connected_output
> 0.50% [kernel] [k] ip_output
> 0.50% [kernel] [k] rt_cache_valid
> 0.44% [kernel] [k] udp4_gro_receive
> 0.43% [kernel] [k] mlx5e_napi_poll
> 0.40% [kernel] [k] udp_gro_receive
> 0.40% [kernel] [k] page_frag_alloc
> 0.40% [kernel] [k] __jhash_nwords
> 0.39% [kernel] [k] swiotlb_map_page
> 0.38% [kernel] [k] mlx5_cqwq_get_wqe
> 0.36% [kernel] [k] mlx5e_features_check
> 0.32% [kernel] [k] get_dma_ops
> 0.31% [kernel] [k] ktime_get_with_offset
> 0.31% [kernel] [k] validate_xmit_skb_list
> 0.28% [kernel] [k] vlan_passthru_hard_header
> 0.28% [kernel] [k] get_dma_ops
> 0.27% [kernel] [k] __udp4_lib_lookup_skb
> 0.26% [kernel] [k] skb_gro_reset_offset
> 0.25% [kernel] [k] skb_release_data
> 0.25% [kernel] [k] timekeeping_get_ns
> 0.24% [kernel] [k] kmem_cache_free_bulk
> 0.24% [kernel] [k] ip_forward_finish
> 0.23% [kernel] [k] compound_head
> 0.23% [kernel] [k] ip_skb_dst_mtu
> 0.22% [kernel] [k] __net_timestamp.isra.90
> 0.22% [kernel] [k] is_swiotlb_buffer
> 0.21% [kernel] [k] neigh_resolve_output
> 0.21% [kernel] [k] dst_metric.constprop.61
> 0.20% [kernel] [k] skb_orphan_frags.constprop.126
> 0.20% [kernel] [k] irq_entries_start
> 0.19% [kernel] [k] mlx5e_calc_min_inline
> 0.19% [kernel] [k] dev_hard_header.constprop.54
> 0.19% [kernel] [k] _kfree_skb_defer
> 0.18% [kernel] [k] _raw_spin_lock
> 0.18% [kernel] [k] ip_route_input_noref
>
>
>
>
>
> W dniu 2017-09-09 o 11:03, Paweł Staszewski pisze:
>> Hi
>>
>>
>> Are there any plans to have this fix normally in kernel ?
>>
>> Or it is mostly only hack - not longterm fix and need to be different ?
>>
>>
>> All tests that was done shows that without this patch there is about
>> 20-30% network forwarding performance degradation when using vlan
>> interfaces
>>
>>
>> Thanks
>> Paweł
>>
>>
>>
>> W dniu 2017-08-15 o 03:17, Eric Dumazet pisze:
>>> On Mon, 2017-08-14 at 18:07 -0700, Eric Dumazet wrote:
>>>
>>>> Or try to hack the IFF_XMIT_DST_RELEASE flag on the vlan netdev.
>>> Something like :
>>>
>>> diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
>>> index
>>> 5e831de3103e2f7092c7fa15534def403bc62fb4..9472de846d5c0960996261cb2843032847fa4bf7
>>> 100644
>>> --- a/net/8021q/vlan_netlink.c
>>> +++ b/net/8021q/vlan_netlink.c
>>> @@ -143,6 +143,7 @@ static int vlan_newlink(struct net *src_net,
>>> struct net_device *dev,
>>> vlan->vlan_proto = proto;
>>> vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
>>> vlan->real_dev = real_dev;
>>> + dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
>>> vlan->flags = VLAN_FLAG_REORDER_HDR;
>>> err = vlan_check_real_dev(real_dev, vlan->vlan_proto,
>>> vlan->vlan_id);
>>>
>>>
>>>
>>>
>>
>>
>
>
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