xen-blkfront.c (754451342fc5954061ede74b0a8485ec4a4c6eaa) xen-blkfront.c (5657a819a8d94426c76be04dcedfad0f64cfff00)
1/*
2 * blkfront.c
3 *
4 * XenLinux virtual block device driver.
5 *
6 * Copyright (c) 2003-2004, Keir Fraser & Steve Hand
7 * Modifications by Mark A. Williamson are (c) Intel Research Cambridge
8 * Copyright (c) 2004, Christian Limpach

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124
125/*
126 * Maximum number of segments in indirect requests, the actual value used by
127 * the frontend driver is the minimum of this value and the value provided
128 * by the backend driver.
129 */
130
131static unsigned int xen_blkif_max_segments = 32;
1/*
2 * blkfront.c
3 *
4 * XenLinux virtual block device driver.
5 *
6 * Copyright (c) 2003-2004, Keir Fraser & Steve Hand
7 * Modifications by Mark A. Williamson are (c) Intel Research Cambridge
8 * Copyright (c) 2004, Christian Limpach

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124
125/*
126 * Maximum number of segments in indirect requests, the actual value used by
127 * the frontend driver is the minimum of this value and the value provided
128 * by the backend driver.
129 */
130
131static unsigned int xen_blkif_max_segments = 32;
132module_param_named(max_indirect_segments, xen_blkif_max_segments, uint,
133 S_IRUGO);
132module_param_named(max_indirect_segments, xen_blkif_max_segments, uint, 0444);
134MODULE_PARM_DESC(max_indirect_segments,
135 "Maximum amount of segments in indirect requests (default is 32)");
136
137static unsigned int xen_blkif_max_queues = 4;
133MODULE_PARM_DESC(max_indirect_segments,
134 "Maximum amount of segments in indirect requests (default is 32)");
135
136static unsigned int xen_blkif_max_queues = 4;
138module_param_named(max_queues, xen_blkif_max_queues, uint, S_IRUGO);
137module_param_named(max_queues, xen_blkif_max_queues, uint, 0444);
139MODULE_PARM_DESC(max_queues, "Maximum number of hardware queues/rings used per virtual disk");
140
141/*
142 * Maximum order of pages to be used for the shared ring between front and
143 * backend, 4KB page granularity is used.
144 */
145static unsigned int xen_blkif_max_ring_order;
138MODULE_PARM_DESC(max_queues, "Maximum number of hardware queues/rings used per virtual disk");
139
140/*
141 * Maximum order of pages to be used for the shared ring between front and
142 * backend, 4KB page granularity is used.
143 */
144static unsigned int xen_blkif_max_ring_order;
146module_param_named(max_ring_page_order, xen_blkif_max_ring_order, int, S_IRUGO);
145module_param_named(max_ring_page_order, xen_blkif_max_ring_order, int, 0444);
147MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the shared ring");
148
149#define BLK_RING_SIZE(info) \
150 __CONST_RING_SIZE(blkif, XEN_PAGE_SIZE * (info)->nr_ring_pages)
151
152#define BLK_MAX_RING_SIZE \
153 __CONST_RING_SIZE(blkif, XEN_PAGE_SIZE * XENBUS_MAX_RING_GRANTS)
154

--- 2523 unchanged lines hidden --- 		146MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the shared ring");
147
148#define BLK_RING_SIZE(info) \
149 __CONST_RING_SIZE(blkif, XEN_PAGE_SIZE * (info)->nr_ring_pages)
150
151#define BLK_MAX_RING_SIZE \
152 __CONST_RING_SIZE(blkif, XEN_PAGE_SIZE * XENBUS_MAX_RING_GRANTS)
153

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