ec51443cc9
Generic Segmentation Offload (GSO) is a SW technique to split large packets into small ones. Akin to TSO, GSO enables applications to operate on large packets, thus reducing per-packet processing overhead. To enable more flexibility to applications, DPDK GSO is implemented as a standalone library. Applications explicitly use the GSO library to segment packets. To segment a packet requires two steps. The first is to set proper flags to mbuf->ol_flags, where the flags are the same as that of TSO. The second is to call the segmentation API, rte_gso_segment(). This patch introduces the GSO API framework to DPDK. rte_gso_segment() splits an input packet into small ones in each invocation. The GSO library refers to these small packets generated by rte_gso_segment() as GSO segments. Each of the newly-created GSO segments is organized as a two-segment MBUF, where the first segment is a standard MBUF, which stores a copy of packet header, and the second is an indirect MBUF which points to a section of data in the input packet. rte_gso_segment() reduces the refcnt of the input packet by 1. Therefore, when all GSO segments are freed, the input packet is freed automatically. Additionally, since each GSO segment has multiple MBUFs (i.e. 2 MBUFs), the driver of the interface which the GSO segments are sent to should support to transmit multi-segment packets. The GSO framework clears the PKT_TX_TCP_SEG flag for both the input packet, and all produced GSO segments in the event of success, since segmentation in hardware is no longer required at that point. Signed-off-by: Jiayu Hu <jiayu.hu@intel.com> Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com> Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
102 lines
4.2 KiB
Plaintext
102 lines
4.2 KiB
Plaintext
# BSD LICENSE
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#
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# Copyright 2013-2017 6WIND S.A.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of 6WIND S.A. nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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PROJECT_NAME = DPDK
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INPUT = doc/api/doxy-api-index.md \
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drivers/crypto/scheduler \
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drivers/net/bnxt \
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drivers/net/bonding \
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drivers/net/i40e \
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drivers/net/ixgbe \
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lib/librte_eal/common/include \
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lib/librte_eal/common/include/generic \
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lib/librte_acl \
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lib/librte_bitratestats \
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lib/librte_cfgfile \
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lib/librte_cmdline \
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lib/librte_compat \
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lib/librte_cryptodev \
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lib/librte_distributor \
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lib/librte_efd \
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lib/librte_ether \
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lib/librte_eventdev \
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lib/librte_gro \
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lib/librte_gso \
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lib/librte_hash \
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lib/librte_ip_frag \
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lib/librte_jobstats \
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lib/librte_kni \
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lib/librte_kvargs \
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lib/librte_latencystats \
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lib/librte_lpm \
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lib/librte_mbuf \
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lib/librte_member \
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lib/librte_mempool \
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lib/librte_meter \
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lib/librte_metrics \
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lib/librte_net \
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lib/librte_pdump \
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lib/librte_pipeline \
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lib/librte_port \
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lib/librte_power \
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lib/librte_reorder \
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lib/librte_ring \
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lib/librte_sched \
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lib/librte_table \
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lib/librte_timer \
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lib/librte_vhost
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FILE_PATTERNS = rte_*.h \
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cmdline.h
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PREDEFINED = __DOXYGEN__ \
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__attribute__(x)=
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OPTIMIZE_OUTPUT_FOR_C = YES
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ENABLE_PREPROCESSING = YES
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MACRO_EXPANSION = YES
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EXPAND_ONLY_PREDEF = YES
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EXTRACT_STATIC = YES
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DISTRIBUTE_GROUP_DOC = YES
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HIDE_UNDOC_MEMBERS = YES
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HIDE_UNDOC_CLASSES = YES
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HIDE_SCOPE_NAMES = YES
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GENERATE_DEPRECATEDLIST = NO
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VERBATIM_HEADERS = NO
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ALPHABETICAL_INDEX = NO
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HTML_TIMESTAMP = NO
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HTML_DYNAMIC_SECTIONS = YES
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SEARCHENGINE = NO
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SORT_MEMBER_DOCS = NO
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SOURCE_BROWSER = YES
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EXAMPLE_PATH = examples
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EXAMPLE_PATTERNS = *.c
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EXAMPLE_RECURSIVE = YES
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