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- Implement the LRO using tcp_lro APIs, and LRO is enabled by default. - Add several stats sysctl nodes. - Check IP/TCP length before sending the packet to tcp_lro_rx(), if host does not provide RX csum information (*); and add an option through sysctl to always trust host TCP segment csum checks (default is off). - Add sysctl to control the LRO entry depth; it is disabled by default. It is used to avoid holding too much TCP segments in driver. Limiting the LRO entry depth helps a lot in a one/two streams RX test. This one 3x the RX performance on my local test (3Gbps -> 10Gbps), and ~2x the RX performance over a directly connected 40Ge network (5Gbps -> 9Gbps). (*) It seems the host stops supplying csum information, once the network load is high. This still needs investigation... Reviewed by: Hongjiang Zhang <honzhan microsoft com>, Dexuan Cui <decui microsoft com>, Jun Su <junsu microsoft com>, delphij Tested by: me (local), Hongjiang Zhang <honzhan microsoft com> (directly connected 40Ge) Approved by: delphij (mentor), adrian (mentor, no objection) With feedback from: delphij, Hongjiang Zhang <honzhan microsoft com> Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D4824
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