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c1f5fc082b
commit e131a5634830047923c694b4ce0c3b31745ff01b upstream. gro_cells lib is used by different encapsulating netdevices, such as geneve, macsec, vxlan etc. to speed up decapsulated traffic processing. CPU tag is a sort of "encapsulation", and we can use the same mechs to greatly improve overall DSA performance. skbs are passed to the GRO layer after removing CPU tags, so we don't need any new packet offload types as it was firstly proposed by me in the first GRO-over-DSA variant [1]. The size of struct gro_cells is sizeof(void *), so hot struct dsa_slave_priv becomes only 4/8 bytes bigger, and all critical fields remain in one 32-byte cacheline. The other positive side effect is that drivers for network devices that can be shipped as CPU ports of DSA-driven switches can now use napi_gro_frags() to pass skbs to kernel. Packets built that way are completely non-linear and are likely being dropped without GRO. This was tested on to-be-mainlined-soon Ethernet driver that uses napi_gro_frags(), and the overall performance was on par with the variant from [1], sometimes even better due to minimal overhead. net.core.gro_normal_batch tuning may help to push it to the limit on particular setups and platforms. iperf3 IPoE VLAN NAT TCP forwarding (port1.218 -> port0) setup on 1.2 GHz MIPS board: 5.7-rc2 baseline: [ID] Interval Transfer Bitrate Retr [ 5] 0.00-120.01 sec 9.00 GBytes 644 Mbits/sec 413 sender [ 5] 0.00-120.00 sec 8.99 GBytes 644 Mbits/sec receiver Iface RX packets TX packets eth0 7097731 7097702 port0 426050 6671829 port1 6671681 425862 port1.218 6671677 425851 With this patch: [ID] Interval Transfer Bitrate Retr [ 5] 0.00-120.01 sec 12.2 GBytes 870 Mbits/sec 122 sender [ 5] 0.00-120.00 sec 12.2 GBytes 870 Mbits/sec receiver Iface RX packets TX packets eth0 9474792 9474777 port0 455200 353288 port1 9019592 455035 port1.218 353144 455024 v2: - Add some performance examples in the commit message; - No functional changes. [1] https://lore.kernel.org/netdev/20191230143028.27313-1-alobakin@dlink.ru/ Signed-off-by: Alexander Lobakin <bloodyreaper@yandex.ru> Signed-off-by: David S. Miller <davem@davemloft.net> Cc: Pali Rohár <pali@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
3.5 KiB
Plaintext
112 lines
3.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config HAVE_NET_DSA
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def_bool y
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depends on INET && NETDEVICES && !S390
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# Drivers must select NET_DSA and the appropriate tagging format
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menuconfig NET_DSA
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tristate "Distributed Switch Architecture"
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depends on HAVE_NET_DSA
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depends on BRIDGE || BRIDGE=n
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select GRO_CELLS
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select NET_SWITCHDEV
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select PHYLINK
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select NET_DEVLINK
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---help---
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Say Y if you want to enable support for the hardware switches supported
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by the Distributed Switch Architecture.
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if NET_DSA
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# tagging formats
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config NET_DSA_TAG_8021Q
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tristate "Tag driver for switches using custom 802.1Q VLAN headers"
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select VLAN_8021Q
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help
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Unlike the other tagging protocols, the 802.1Q config option simply
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provides helpers for other tagging implementations that might rely on
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VLAN in one way or another. It is not a complete solution.
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Drivers which use these helpers should select this as dependency.
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config NET_DSA_TAG_BRCM_COMMON
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tristate
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default n
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config NET_DSA_TAG_BRCM
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tristate "Tag driver for Broadcom switches using in-frame headers"
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select NET_DSA_TAG_BRCM_COMMON
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help
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Say Y if you want to enable support for tagging frames for the
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Broadcom switches which place the tag after the MAC source address.
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config NET_DSA_TAG_BRCM_PREPEND
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tristate "Tag driver for Broadcom switches using prepended headers"
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select NET_DSA_TAG_BRCM_COMMON
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help
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Say Y if you want to enable support for tagging frames for the
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Broadcom switches which places the tag before the Ethernet header
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(prepended).
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config NET_DSA_TAG_GSWIP
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tristate "Tag driver for Lantiq / Intel GSWIP switches"
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help
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Say Y or M if you want to enable support for tagging frames for the
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Lantiq / Intel GSWIP switches.
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config NET_DSA_TAG_DSA
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tristate "Tag driver for Marvell switches using DSA headers"
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help
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Say Y or M if you want to enable support for tagging frames for the
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Marvell switches which use DSA headers.
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config NET_DSA_TAG_EDSA
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tristate "Tag driver for Marvell switches using EtherType DSA headers"
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help
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Say Y or M if you want to enable support for tagging frames for the
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Marvell switches which use EtherType DSA headers.
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config NET_DSA_TAG_MTK
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tristate "Tag driver for Mediatek switches"
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help
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Say Y or M if you want to enable support for tagging frames for
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Mediatek switches.
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config NET_DSA_TAG_KSZ
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tristate "Tag driver for Microchip 8795/9477/9893 families of switches"
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help
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Say Y if you want to enable support for tagging frames for the
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Microchip 8795/9477/9893 families of switches.
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config NET_DSA_TAG_QCA
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tristate "Tag driver for Qualcomm Atheros QCA8K switches"
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help
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Say Y or M if you want to enable support for tagging frames for
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the Qualcomm Atheros QCA8K switches.
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config NET_DSA_TAG_LAN9303
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tristate "Tag driver for SMSC/Microchip LAN9303 family of switches"
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help
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Say Y or M if you want to enable support for tagging frames for the
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SMSC/Microchip LAN9303 family of switches.
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config NET_DSA_TAG_SJA1105
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tristate "Tag driver for NXP SJA1105 switches"
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select NET_DSA_TAG_8021Q
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select PACKING
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help
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Say Y or M if you want to enable support for tagging frames with the
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NXP SJA1105 switch family. Both the native tagging protocol (which
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is only for link-local traffic) as well as non-native tagging (based
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on a custom 802.1Q VLAN header) are available.
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config NET_DSA_TAG_TRAILER
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tristate "Tag driver for switches using a trailer tag"
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help
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Say Y or M if you want to enable support for tagging frames at
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with a trailed. e.g. Marvell 88E6060.
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endif
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