Date: Wed, 8 Jun 2016 13:28:28 +0200 (CEST) From: tom.barbette@ulg.ac.be To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: "Andrey V. Elsukov" <bu7cher@yandex.ru>, Andrew Vylegzhanin <avv314@gmail.com>, freebsd-net@freebsd.org, Ryan Stone <rysto32@gmail.com> Subject: Re: Is netmap jumbo frames broken in STABLE? Message-ID: <1502708678.10983095.1465385308094.JavaMail.zimbra@ulg.ac.be> In-Reply-To: <CA%2BhQ2%2Bjtd9FGuaJfJ6N1yt2%2BjSkez8Bj1usjpO%2BBCt-3Yvx2ww@mail.gmail.com> References: <CA%2BBi_YhqCnt5pQ_hC5zWdBp24=Zn3Rcj29AwtMrguPhSoJZSdQ@mail.gmail.com> <CA%2BhQ2%2BjcT_E4osrTB00%2Bf0gwSCoG_Zy%2BVdU8LXndqsjnmxPQ3Q@mail.gmail.com> <CAFMmRNy=PEFOxM4tGM7TQqpMnhTba17ACiaOcfuG8fkDET0RZw@mail.gmail.com> <CA%2BBi_YiqcOTw7T_dDzjis8yFu7oGd8G-av2BEaStXFiU7ovUCw@mail.gmail.com> <5756C17D.1090409@yandex.ru> <CA%2BhQ2%2Bjtd9FGuaJfJ6N1yt2%2BjSkez8Bj1usjpO%2BBCt-3Yvx2ww@mail.gmail.com>
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Support for fragmented packets with ixgbe was recently added on the linux version of Netmap : https://github.com/luigirizzo/netmap/commit/fc1e77560a8a8ea93cc3594de5fae94334debcd3 I think the change for freebsd would be quite the same looking at https://github.com/freebsd/freebsd/blob/master/sys/dev/netmap/ixgbe_netmap.h#L396 After that, your userspace application simply have to check for the NS_MOREFRAG flag in the receive ring, and if it's set he knows the end of the packet will follow in the next buf. Tom
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