diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/xen/interface/io/blkif.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h index ee338bfde18..31063bd1b69 100644 --- a/include/xen/interface/io/blkif.h +++ b/include/xen/interface/io/blkif.h @@ -168,6 +168,18 @@ struct blkif_response { DEFINE_RING_TYPES(blkif, struct blkif_request, struct blkif_response); +/* + * Maximum number of pages used for a blkif ring + * max-ring-pages advertised by blkback to blkfront may be lowered at blkback + * mod load time. Load time param set to default. + */ +#define BLKIF_MAX_NUM_RING_PAGES 16 +#define BLKIF_MAX_NUM_RING_PAGES_DFLT 4 +#if BLKIF_MAX_NUM_RING_PAGES < BLKIF_MAX_NUM_RING_PAGES_DFLT +#undef BLKIF_MAX_NUM_RING_PAGES_DFLT +#define BLKIF_MAX_NUM_RING_PAGES_DFLT BLKIF_MAX_NUM_RING_PAGES +#endif + #define VDISK_CDROM 0x1 #define VDISK_REMOVABLE 0x2 #define VDISK_READONLY 0x4 |