svn commit: r306661 - in stable/11/sys/dev/cxgbe: . tom
Slawa Olhovchenkov
slw at zxy.spb.ru
Mon Oct 10 11:09:10 UTC 2016
On Mon, Oct 03, 2016 at 11:15:44PM +0000, John Baldwin wrote:
> Author: jhb
> Date: Mon Oct 3 23:15:44 2016
> New Revision: 306661
> URL: https://svnweb.freebsd.org/changeset/base/306661
>
> Log:
> MFC 303405: Add support for zero-copy aio_write() on TOE sockets.
>
> AIO write requests for a TOE socket on a Chelsio T4+ adapter can now
> DMA directly from the user-supplied buffer. This is implemented by
> wiring the pages backing the user-supplied buffer and queueing special
> mbufs backed by raw VM pages to the socket buffer. The TOE code
> recognizes these special mbufs and builds a sglist from the VM page
> array associated with the mbuf when queueing a work request to the TOE.
>
> Because these mbufs do not have an associated virtual address, m_data
> is not valid. Thus, the AIO handler does not invoke sosend() directly
> for these mbufs but instead inlines portions of sosend_generic() and
> tcp_usr_send().
>
> An aiotx_buffer structure is used to describe the user buffer (e.g.
> it holds the array of VM pages and a reference to the AIO job). The
> special mbufs reference this structure via m_ext. Note that a single
> job might be split across multiple mbufs (e.g. if it is larger than
> the socket buffer size). The 'ext_arg2' member of each mbuf gives an
> offset relative to the backing aiotx_buffer. The AIO job associated
> with an aiotx_buffer structure is completed when the last reference to
> the structure is released.
>
> Zero-copy aio_write()'s for connections associated with a given
> adapter can be enabled/disabled at runtime via the
> 'dev.t[45]nex.N.toe.tx_zcopy' sysctl.
>
> Sponsored by: Chelsio Communications
Do you have any public available application patches for support this?
May be nginx?
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