virtio: make add_buf return capacity remaining

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This API change means that virtio_net can tell how much capacity
remains for buffers.  It's necessarily fuzzy, since
VIRTIO_RING_F_INDIRECT_DESC means we can fit any number of descriptors
in one, *if* we can kmalloc.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Dinesh Subhraveti <dineshs@us.ibm.com>

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This commit is contained in:

Rusty Russell 2009-09-23 22:26:31 -06:00

parent f68d24082e

commit 3c1b27d504

8 changed files with 19 additions and 15 deletions

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include/linux/virtio.h

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