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sfc: Specify that the VFDI status page has page alignment and size

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This requirement was meant to be implied in the name 'status page'.
One out-of-tree VF driver allocates a buffer using the structure size
and not a full page - hence the current odd specification - but in
practice that allocation will be padded and aligned to at least 4KB.
Therefore, we can specify this and have the option to extend the
structure up to 4KB without worrying about VF drivers using odd-shaped
buffers.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2012-02-20 23:22:02 +00:00
parent 0b0a635f79
commit c3cb2a8741
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/sfc/vfdi.h
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@ -152,7 +152,8 @@ enum vfdi_op {
* all traffic at this receive queue.
* @u.mac_filter.flags: MAC filter flags.
* @u.set_status_page.dma_addr: Base address for the &struct vfdi_status.
* This address must be such that the structure fits within a page.
* This address must be page-aligned and the PF may write up to a
* whole page (allowing for extension of the structure).
* @u.set_status_page.peer_page_count: Number of additional pages the VF
* has provided into which peer addresses may be DMAd.
* @u.set_status_page.peer_page_addr: Array of DMA addresses of pages.