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Abbreviated as TSO, TCP Segmentation Offload is a feature which enables the network stack to delegate the TCP segmentation to the NIC reducing the per packet CPU overhead. A guest using vhostuser interface with TSO enabled can send TCP packets much bigger than the MTU, which saves CPU cycles normally used to break the packets down to MTU size and to calculate checksums. It also saves CPU cycles used to parse multiple packets/headers during the packet processing inside virtual switch. If the destination of the packet is another guest in the same host, then the same big packet can be sent through a vhostuser interface skipping the segmentation completely. However, if the destination is not local, the NIC hardware is instructed to do the TCP segmentation and checksum calculation. It is recommended to check if NIC hardware supports TSO before enabling the feature, which is off by default. For additional information please check the tso.rst document. Signed-off-by: Flavio Leitner <fbl@sysclose.org> Tested-by: Ciara Loftus <ciara.loftus.intel.com> Signed-off-by: Ian Stokes <ian.stokes@intel.com>
24 lines
779 B
C
24 lines
779 B
C
/*
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* Copyright (c) 2020 Red Hat Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef USERSPACE_TSO_H
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#define USERSPACE_TSO_H 1
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void userspace_tso_init(const struct smap *ovs_other_config);
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bool userspace_tso_enabled(void);
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#endif /* userspace-tso.h */
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