diff options
Diffstat (limited to 'sys/dev/xen/blkfront/block.h')
| -rw-r--r-- | sys/dev/xen/blkfront/block.h | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/sys/dev/xen/blkfront/block.h b/sys/dev/xen/blkfront/block.h index 8dcd322..28c6ff2 100644 --- a/sys/dev/xen/blkfront/block.h +++ b/sys/dev/xen/blkfront/block.h @@ -75,11 +75,25 @@ __CONST_RING_SIZE(blkif, PAGE_SIZE * XBD_MAX_RING_PAGES) /** - * The maximum mapped region size per request we will allow in a negotiated - * block-front/back communication channel. + * The maximum number of blkif segments which can be provided per indirect + * page in an indirect request. + */ +#define XBD_MAX_SEGMENTS_PER_PAGE \ + (PAGE_SIZE / sizeof(struct blkif_request_segment)) + +/** + * The maximum number of blkif segments which can be provided in an indirect + * request. + */ +#define XBD_MAX_INDIRECT_SEGMENTS \ + (BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST * XBD_MAX_SEGMENTS_PER_PAGE) + +/** + * Compute the number of indirect segment pages required for an I/O with the + * specified number of indirect segments. */ -#define XBD_MAX_REQUEST_SIZE \ - MIN(MAXPHYS, XBD_SEGS_TO_SIZE(BLKIF_MAX_SEGMENTS_PER_REQUEST)) +#define XBD_INDIRECT_SEGS_TO_PAGES(segs) \ + ((segs + XBD_MAX_SEGMENTS_PER_PAGE - 1) / XBD_MAX_SEGMENTS_PER_PAGE) typedef enum { XBDCF_Q_MASK = 0xFF, @@ -111,6 +125,8 @@ struct xbd_command { blkif_sector_t cm_sector_number; int cm_status; xbd_cbcf_t *cm_complete; + void *cm_indirectionpages; + grant_ref_t cm_indirectionrefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST]; }; typedef enum { @@ -165,6 +181,7 @@ struct xbd_softc { uint32_t xbd_max_requests; uint32_t xbd_max_request_segments; uint32_t xbd_max_request_size; + uint32_t xbd_max_request_indirectpages; grant_ref_t xbd_ring_ref[XBD_MAX_RING_PAGES]; blkif_front_ring_t xbd_ring; xen_intr_handle_t xen_intr_handle; |
