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authorShani Michaeli <shanim@mellanox.com>2013-02-06 11:19:12 -0500
committerRoland Dreier <roland@purestorage.com>2013-02-21 14:51:45 -0500
commit7083e42ee2ff43a11481e0e7211ec4f9ac68cb79 (patch)
treecf2c3f16075fcb37c27bff5ae4524f778df9a482 /include/uapi/linux/usb
parent836dc9e3fbbab0c30aa6e664417225f5c1fb1c39 (diff)
IB/core: Add "type 2" memory windows support
This patch enhances the IB core support for Memory Windows (MWs). MWs allow an application to have better/flexible control over remote access to memory. Two types of MWs are supported, with the second type having two flavors: Type 1 - associated with PD only Type 2A - associated with QPN only Type 2B - associated with PD and QPN Applications can allocate a MW once, and then repeatedly bind the MW to different ranges in MRs that are associated to the same PD. Type 1 windows are bound through a verb, while type 2 windows are bound by posting a work request. The 32-bit memory key is composed of a 24-bit index and an 8-bit key. The key is changed with each bind, thus allowing more control over the peer's use of the memory key. The changes introduced are the following: * add memory window type enum and a corresponding parameter to ib_alloc_mw. * type 2 memory window bind work request support. * create a struct that contains the common part of the bind verb struct ibv_mw_bind and the bind work request into a single struct. * add the ib_inc_rkey helper function to advance the tag part of an rkey. Consumer interface details: * new device capability flags IB_DEVICE_MEM_WINDOW_TYPE_2A and IB_DEVICE_MEM_WINDOW_TYPE_2B are added to indicate device support for these features. Devices can set either IB_DEVICE_MEM_WINDOW_TYPE_2A or IB_DEVICE_MEM_WINDOW_TYPE_2B if it supports type 2A or type 2B memory windows. It can set neither to indicate it doesn't support type 2 windows at all. * modify existing provides and consumers code to the new param of ib_alloc_mw and the ib_mw_bind_info structure Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Shani Michaeli <shanim@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'include/uapi/linux/usb')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-14 13:51:23 -0400
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/*
 * Copyright (c) 2000-2001 Christoph Hellwig.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL").
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Veritas filesystem driver - filesystem to disk block mapping.
 */
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/kernel.h>

#include "vxfs.h"
#include "vxfs_inode.h"
#include "vxfs_extern.h"


#ifdef DIAGNOSTIC
static void
vxfs_typdump(struct vxfs_typed *typ)
{
	printk(KERN_DEBUG "type=%Lu ", typ->vt_hdr >> VXFS_TYPED_TYPESHIFT);
	printk("offset=%Lx ", typ->vt_hdr & VXFS_TYPED_OFFSETMASK);
	printk("block=%x ", typ->vt_block);
	printk("size=%x\n", typ->vt_size);
}
#endif

/**
 * vxfs_bmap_ext4 - do bmap for ext4 extents
 * @ip:		pointer to the inode we do bmap for
 * @iblock:	logical block.
 *
 * Description:
 *   vxfs_bmap_ext4 performs the bmap operation for inodes with
 *   ext4-style extents (which are much like the traditional UNIX
 *   inode organisation).
 *
 * Returns:
 *   The physical block number on success, else Zero.
 */
static daddr_t
vxfs_bmap_ext4(struct inode *ip, long bn)
{
	struct super_block *sb = ip->i_sb;
	struct vxfs_inode_info *vip = VXFS_INO(ip);
	unsigned long bsize = sb->s_blocksize;
	u32 indsize = vip->vii_ext4.ve4_indsize;
	int i;

	if (indsize > sb->s_blocksize)
		goto fail_size;

	for (i = 0; i < VXFS_NDADDR; i++) {
		struct direct *d = vip->vii_ext4.ve4_direct + i;
		if (bn >= 0 && bn < d->size)
			return (bn + d->extent);
		bn -= d->size;
	}

	if ((bn / (indsize * indsize * bsize / 4)) == 0) {
		struct buffer_head *buf;
		daddr_t	bno;
		u32 *indir;

		buf = sb_bread(sb, vip->vii_ext4.ve4_indir[0]);
		if (!buf || !buffer_mapped(buf))
			goto fail_buf;

		indir = (u32 *)buf->b_data;
		bno = indir[(bn/indsize) % (indsize*bn)] + (bn%indsize);

		brelse(buf);
		return bno;
	} else
		printk(KERN_WARNING "no matching indir?");

	return 0;

fail_size:
	printk("vxfs: indirect extent too big!\n");
fail_buf:
	return 0;
}

/**
 * vxfs_bmap_indir - recursion for vxfs_bmap_typed
 * @ip:		pointer to the inode we do bmap for
 * @indir:	indirect block we start reading at
 * @size:	size of the typed area to search
 * @block:	partially result from further searches
 *
 * Description:
 *   vxfs_bmap_indir reads a &struct vxfs_typed at @indir
 *   and performs the type-defined action.
 *
 * Return Value:
 *   The physical block number on success, else Zero.
 *
 * Note:
 *   Kernelstack is rare.  Unrecurse?
 */
static daddr_t
vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
{
	struct buffer_head		*bp = NULL;
	daddr_t				pblock = 0;
	int				i;

	for (i = 0; i < size * VXFS_TYPED_PER_BLOCK(ip->i_sb); i++) {
		struct vxfs_typed	*typ;
		int64_t			off;

		bp = sb_bread(ip->i_sb,
				indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
		if (!bp || !buffer_mapped(bp))
			return 0;