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This provides a software implementation in the case the egress netdev doesn't support segmentation in hardware. The challenge here is to guarantee packet ordering in the original batch that may be full of TSO packets. Each TSO packet can go up to ~64kB, so with segment size of 1440 that means about 44 packets for each TSO. Each batch has 32 packets, so the total batch amounts to 1408 normal packets. The segmentation estimates the total number of packets and then the total number of batches. Then allocate enough memory and finally do the work. Finally each batch is sent in order to the netdev. Signed-off-by: Flavio Leitner <fbl@sysclose.org> Co-authored-by: Mike Pattrick <mkp@redhat.com> Signed-off-by: Mike Pattrick <mkp@redhat.com> Acked-by: Simon Horman <horms@ovn.org> Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
24 lines
798 B
C
24 lines
798 B
C
/*
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* Copyright (c) 2023 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 DP_PACKET_GSO_H
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#define DP_PACKET_GSO_H 1
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bool dp_packet_gso(struct dp_packet *, struct dp_packet_batch **);
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int dp_packet_gso_nr_segs(struct dp_packet *);
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#endif /* dp-packet-gso.h */
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