xen/pvcalls: implement sendmsg

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Send data to an active socket by copying data to the "out" ring. Take
the active socket out_mutex so that only one function can access the
ring at any given time.

If not enough room is available on the ring, rather than returning
immediately or sleep-waiting, spin for up to 5000 cycles. This small
optimization turns out to improve performance significantly.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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Stefano Stabellini 2017-10-30 15:40:59 -07:00 • committed by Boris Ostrovsky

parent 9774c6cca2

commit 45ddce214a

2 changed files with 124 additions and 0 deletions

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121

drivers/xen/pvcalls-front.c

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3

drivers/xen/pvcalls-front.h

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