1 files changed, 0 insertions, 837 deletions

diff --git a/net/rds/iw_rdma.c b/net/rds/iw_rdma.c
deleted file mode 100644
index b09a40c..0000000
--- a/net/rds/iw_rdma.c
+++ /dev/null
@@ -1,837 +0,0 @@
-/*
- * Copyright (c) 2006 Oracle.  All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses.  You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- *     Redistribution and use in source and binary forms, with or
- *     without modification, are permitted provided that the following
- *     conditions are met:
- *
- *      - Redistributions of source code must retain the above
- *        copyright notice, this list of conditions and the following
- *        disclaimer.
- *
- *      - Redistributions in binary form must reproduce the above
- *        copyright notice, this list of conditions and the following
- *        disclaimer in the documentation and/or other materials
- *        provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- *
- */
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/ratelimit.h>
-
-#include "rds.h"
-#include "iw.h"
-
-
-/*
- * This is stored as mr->r_trans_private.
- */
-struct rds_iw_mr {
-	struct rds_iw_device	*device;
-	struct rds_iw_mr_pool	*pool;
-	struct rdma_cm_id	*cm_id;
-
-	struct ib_mr	*mr;
-
-	struct rds_iw_mapping	mapping;
-	unsigned char		remap_count;
-};
-
-/*
- * Our own little MR pool
- */
-struct rds_iw_mr_pool {
-	struct rds_iw_device	*device;		/* back ptr to the device that owns us */
-
-	struct mutex		flush_lock;		/* serialize fmr invalidate */
-	struct work_struct	flush_worker;		/* flush worker */
-
-	spinlock_t		list_lock;		/* protect variables below */
-	atomic_t		item_count;		/* total # of MRs */
-	atomic_t		dirty_count;		/* # dirty of MRs */
-	struct list_head	dirty_list;		/* dirty mappings */
-	struct list_head	clean_list;		/* unused & unamapped MRs */
-	atomic_t		free_pinned;		/* memory pinned by free MRs */
-	unsigned long		max_message_size;	/* in pages */
-	unsigned long		max_items;
-	unsigned long		max_items_soft;
-	unsigned long		max_free_pinned;
-	int			max_pages;
-};
-
-static void rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all);
-static void rds_iw_mr_pool_flush_worker(struct work_struct *work);
-static int rds_iw_init_reg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
-static int rds_iw_map_reg(struct rds_iw_mr_pool *pool,
-			  struct rds_iw_mr *ibmr,
-			  struct scatterlist *sg, unsigned int nents);
-static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
-static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
-			struct list_head *unmap_list,
-			struct list_head *kill_list,
-			int *unpinned);
-static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr);
-
-static int rds_iw_get_device(struct sockaddr_in *src, struct sockaddr_in *dst,
-			     struct rds_iw_device **rds_iwdev,
-			     struct rdma_cm_id **cm_id)
-{
-	struct rds_iw_device *iwdev;
-	struct rds_iw_cm_id *i_cm_id;
-
-	*rds_iwdev = NULL;
-	*cm_id = NULL;
-
-	list_for_each_entry(iwdev, &rds_iw_devices, list) {
-		spin_lock_irq(&iwdev->spinlock);
-		list_for_each_entry(i_cm_id, &iwdev->cm_id_list, list) {
-			struct sockaddr_in *src_addr, *dst_addr;
-
-			src_addr = (struct sockaddr_in *)&i_cm_id->cm_id->route.addr.src_addr;
-			dst_addr = (struct sockaddr_in *)&i_cm_id->cm_id->route.addr.dst_addr;
-
-			rdsdebug("local ipaddr = %x port %d, "
-				 "remote ipaddr = %x port %d"
-				 "..looking for %x port %d, "
-				 "remote ipaddr = %x port %d\n",
-				src_addr->sin_addr.s_addr,
-				src_addr->sin_port,
-				dst_addr->sin_addr.s_addr,
-				dst_addr->sin_port,
-				src->sin_addr.s_addr,
-				src->sin_port,
-				dst->sin_addr.s_addr,
-				dst->sin_port);
-#ifdef WORKING_TUPLE_DETECTION
-			if (src_addr->sin_addr.s_addr == src->sin_addr.s_addr &&
-			    src_addr->sin_port == src->sin_port &&
-			    dst_addr->sin_addr.s_addr == dst->sin_addr.s_addr &&
-			    dst_addr->sin_port == dst->sin_port) {
-#else
-			/* FIXME - needs to compare the local and remote
-			 * ipaddr/port tuple, but the ipaddr is the only
-			 * available information in the rds_sock (as the rest are
-			 * zero'ed.  It doesn't appear to be properly populated
-			 * during connection setup...
-			 */
-			if (src_addr->sin_addr.s_addr == src->sin_addr.s_addr) {
-#endif
-				spin_unlock_irq(&iwdev->spinlock);
-				*rds_iwdev = iwdev;
-				*cm_id = i_cm_id->cm_id;
-				return 0;
-			}
-		}
-		spin_unlock_irq(&iwdev->spinlock);
-	}
-
-	return 1;
-}
-
-static int rds_iw_add_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id)
-{
-	struct rds_iw_cm_id *i_cm_id;
-
-	i_cm_id = kmalloc(sizeof *i_cm_id, GFP_KERNEL);
-	if (!i_cm_id)
-		return -ENOMEM;
-
-	i_cm_id->cm_id = cm_id;
-
-	spin_lock_irq(&rds_iwdev->spinlock);
-	list_add_tail(&i_cm_id->list, &rds_iwdev->cm_id_list);
-	spin_unlock_irq(&rds_iwdev->spinlock);
-
-	return 0;
-}
-
-static void rds_iw_remove_cm_id(struct rds_iw_device *rds_iwdev,
-				struct rdma_cm_id *cm_id)
-{
-	struct rds_iw_cm_id *i_cm_id;
-
-	spin_lock_irq(&rds_iwdev->spinlock);
-	list_for_each_entry(i_cm_id, &rds_iwdev->cm_id_list, list) {
-		if (i_cm_id->cm_id == cm_id) {
-			list_del(&i_cm_id->list);
-			kfree(i_cm_id);
-			break;
-		}
-	}
-	spin_unlock_irq(&rds_iwdev->spinlock);
-}
-
-
-int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id)
-{
-	struct sockaddr_in *src_addr, *dst_addr;
-	struct rds_iw_device *rds_iwdev_old;
-	struct rdma_cm_id *pcm_id;
-	int rc;
-
-	src_addr = (struct sockaddr_in *)&cm_id->route.addr.src_addr;
-	dst_addr = (struct sockaddr_in *)&cm_id->route.addr.dst_addr;
-
-	rc = rds_iw_get_device(src_addr, dst_addr, &rds_iwdev_old, &pcm_id);
-	if (rc)
-		rds_iw_remove_cm_id(rds_iwdev, cm_id);
-
-	return rds_iw_add_cm_id(rds_iwdev, cm_id);
-}
-
-void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn)
-{
-	struct rds_iw_connection *ic = conn->c_transport_data;
-
-	/* conn was previously on the nodev_conns_list */
-	spin_lock_irq(&iw_nodev_conns_lock);
-	BUG_ON(list_empty(&iw_nodev_conns));
-	BUG_ON(list_empty(&ic->iw_node));
-	list_del(&ic->iw_node);
-
-	spin_lock(&rds_iwdev->spinlock);
-	list_add_tail(&ic->iw_node, &rds_iwdev->conn_list);
-	spin_unlock(&rds_iwdev->spinlock);
-	spin_unlock_irq(&iw_nodev_conns_lock);
-
-	ic->rds_iwdev = rds_iwdev;
-}
-
-void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn)
-{
-	struct rds_iw_connection *ic = conn->c_transport_data;
-
-	/* place conn on nodev_conns_list */
-	spin_lock(&iw_nodev_conns_lock);
-
-	spin_lock_irq(&rds_iwdev->spinlock);
-	BUG_ON(list_empty(&ic->iw_node));
-	list_del(&ic->iw_node);
-	spin_unlock_irq(&rds_iwdev->spinlock);
-
-	list_add_tail(&ic->iw_node, &iw_nodev_conns);
-
-	spin_unlock(&iw_nodev_conns_lock);
-
-	rds_iw_remove_cm_id(ic->rds_iwdev, ic->i_cm_id);
-	ic->rds_iwdev = NULL;
-}
-
-void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock)
-{
-	struct rds_iw_connection *ic, *_ic;
-	LIST_HEAD(tmp_list);
-
-	/* avoid calling conn_destroy with irqs off */
-	spin_lock_irq(list_lock);
-	list_splice(list, &tmp_list);
-	INIT_LIST_HEAD(list);
-	spin_unlock_irq(list_lock);
-
-	list_for_each_entry_safe(ic, _ic, &tmp_list, iw_node)
-		rds_conn_destroy(ic->conn);
-}
-
-static void rds_iw_set_scatterlist(struct rds_iw_scatterlist *sg,
-		struct scatterlist *list, unsigned int sg_len)
-{
-	sg->list = list;
-	sg->len = sg_len;
-	sg->dma_len = 0;
-	sg->dma_npages = 0;
-	sg->bytes = 0;
-}
-
-static int rds_iw_map_scatterlist(struct rds_iw_device *rds_iwdev,
-				  struct rds_iw_scatterlist *sg)
-{
-	struct ib_device *dev = rds_iwdev->dev;
-	int i, ret;
-
-	WARN_ON(sg->dma_len);
-
-	sg->dma_len = ib_dma_map_sg(dev, sg->list, sg->len, DMA_BIDIRECTIONAL);
-	if (unlikely(!sg->dma_len)) {
-		printk(KERN_WARNING "RDS/IW: dma_map_sg failed!\n");
-		return -EBUSY;
-	}
-
-	sg->bytes = 0;
-	sg->dma_npages = 0;
-
-	ret = -EINVAL;
-	for (i = 0; i < sg->dma_len; ++i) {
-		unsigned int dma_len = ib_sg_dma_len(dev, &sg->list[i]);
-		u64 dma_addr = ib_sg_dma_address(dev, &sg->list[i]);
-		u64 end_addr;
-
-		sg->bytes += dma_len;
-
-		end_addr = dma_addr + dma_len;
-		if (dma_addr & PAGE_MASK) {
-			if (i > 0)
-				goto out_unmap;
-			dma_addr &= ~PAGE_MASK;
-		}
-		if (end_addr & PAGE_MASK) {
-			if (i < sg->dma_len - 1)
-				goto out_unmap;
-			end_addr = (end_addr + PAGE_MASK) & ~PAGE_MASK;
-		}
-
-		sg->dma_npages += (end_addr - dma_addr) >> PAGE_SHIFT;
-	}
-
-	/* Now gather the dma addrs into one list */
-	if (sg->dma_npages > fastreg_message_size)
-		goto out_unmap;
-
-
-
-	return 0;
-
-out_unmap:
-	ib_dma_unmap_sg(rds_iwdev->dev, sg->list, sg->len, DMA_BIDIRECTIONAL);
-	sg->dma_len = 0;
-	return ret;
-}
-
-
-struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *rds_iwdev)
-{
-	struct rds_iw_mr_pool *pool;
-
-	pool = kzalloc(sizeof(*pool), GFP_KERNEL);
-	if (!pool) {
-		printk(KERN_WARNING "RDS/IW: rds_iw_create_mr_pool alloc error\n");
-		return ERR_PTR(-ENOMEM);
-	}
-
-	pool->device = rds_iwdev;
-	INIT_LIST_HEAD(&pool->dirty_list);
-	INIT_LIST_HEAD(&pool->clean_list);
-	mutex_init(&pool->flush_lock);
-	spin_lock_init(&pool->list_lock);
-	INIT_WORK(&pool->flush_worker, rds_iw_mr_pool_flush_worker);
-
-	pool->max_message_size = fastreg_message_size;
-	pool->max_items = fastreg_pool_size;
-	pool->max_free_pinned = pool->max_items * pool->max_message_size / 4;
-	pool->max_pages = fastreg_message_size;
-
-	/* We never allow more than max_items MRs to be allocated.
-	 * When we exceed more than max_items_soft, we start freeing
-	 * items more aggressively.
-	 * Make sure that max_items > max_items_soft > max_items / 2
-	 */
-	pool->max_items_soft = pool->max_items * 3 / 4;
-
-	return pool;
-}
-
-void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo)
-{
-	struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool;
-
-	iinfo->rdma_mr_max = pool->max_items;
-	iinfo->rdma_mr_size = pool->max_pages;
-}
-
-void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *pool)
-{
-	flush_workqueue(rds_wq);
-	rds_iw_flush_mr_pool(pool, 1);
-	BUG_ON(atomic_read(&pool->item_count));
-	BUG_ON(atomic_read(&pool->free_pinned));
-	kfree(pool);
-}
-
-static inline struct rds_iw_mr *rds_iw_reuse_fmr(struct rds_iw_mr_pool *pool)
-{
-	struct rds_iw_mr *ibmr = NULL;
-	unsigned long flags;
-
-	spin_lock_irqsave(&pool->list_lock, flags);
-	if (!list_empty(&pool->clean_list)) {
-		ibmr = list_entry(pool->clean_list.next, struct rds_iw_mr, mapping.m_list);
-		list_del_init(&ibmr->mapping.m_list);
-	}
-	spin_unlock_irqrestore(&pool->list_lock, flags);
-
-	return ibmr;
-}
-
-static struct rds_iw_mr *rds_iw_alloc_mr(struct rds_iw_device *rds_iwdev)
-{
-	struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool;
-	struct rds_iw_mr *ibmr = NULL;
-	int err = 0, iter = 0;
-
-	while (1) {
-		ibmr = rds_iw_reuse_fmr(pool);
-		if (ibmr)
-			return ibmr;
-
-		/* No clean MRs - now we have the choice of either
-		 * allocating a fresh MR up to the limit imposed by the
-		 * driver, or flush any dirty unused MRs.
-		 * We try to avoid stalling in the send path if possible,
-		 * so we allocate as long as we're allowed to.
-		 *
-		 * We're fussy with enforcing the FMR limit, though. If the driver
-		 * tells us we can't use more than N fmrs, we shouldn't start
-		 * arguing with it */
-		if (atomic_inc_return(&pool->item_count) <= pool->max_items)
-			break;
-
-		atomic_dec(&pool->item_count);
-
-		if (++iter > 2) {
-			rds_iw_stats_inc(s_iw_rdma_mr_pool_depleted);
-			return ERR_PTR(-EAGAIN);
-		}
-
-		/* We do have some empty MRs. Flush them out. */
-		rds_iw_stats_inc(s_iw_rdma_mr_pool_wait);
-		rds_iw_flush_mr_pool(pool, 0);
-	}
-
-	ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL);
-	if (!ibmr) {
-		err = -ENOMEM;
-		goto out_no_cigar;
-	}
-
-	spin_lock_init(&ibmr->mapping.m_lock);
-	INIT_LIST_HEAD(&ibmr->mapping.m_list);
-	ibmr->mapping.m_mr = ibmr;
-
-	err = rds_iw_init_reg(pool, ibmr);
-	if (err)
-		goto out_no_cigar;
-
-	rds_iw_stats_inc(s_iw_rdma_mr_alloc);
-	return ibmr;
-
-out_no_cigar:
-	if (ibmr) {
-		rds_iw_destroy_fastreg(pool, ibmr);
-		kfree(ibmr);
-	}
-	atomic_dec(&pool->item_count);
-	return ERR_PTR(err);
-}
-
-void rds_iw_sync_mr(void *trans_private, int direction)
-{
-	struct rds_iw_mr *ibmr = trans_private;
-	struct rds_iw_device *rds_iwdev = ibmr->device;
-
-	switch (direction) {
-	case DMA_FROM_DEVICE:
-		ib_dma_sync_sg_for_cpu(rds_iwdev->dev, ibmr->mapping.m_sg.list,
-			ibmr->mapping.m_sg.dma_len, DMA_BIDIRECTIONAL);
-		break;
-	case DMA_TO_DEVICE:
-		ib_dma_sync_sg_for_device(rds_iwdev->dev, ibmr->mapping.m_sg.list,
-			ibmr->mapping.m_sg.dma_len, DMA_BIDIRECTIONAL);
-		break;
-	}
-}
-
-/*
- * Flush our pool of MRs.
- * At a minimum, all currently unused MRs are unmapped.
- * If the number of MRs allocated exceeds the limit, we also try
- * to free as many MRs as needed to get back to this limit.
- */
-static void rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all)
-{
-	struct rds_iw_mr *ibmr, *next;
-	LIST_HEAD(unmap_list);
-	LIST_HEAD(kill_list);
-	unsigned long flags;
-	unsigned int nfreed = 0, ncleaned = 0, unpinned = 0;
-
-	rds_iw_stats_inc(s_iw_rdma_mr_pool_flush);
-
-	mutex_lock(&pool->flush_lock);
-
-	spin_lock_irqsave(&pool->list_lock, flags);
-	/* Get the list of all mappings to be destroyed */
-	list_splice_init(&pool->dirty_list, &unmap_list);
-	if (free_all)
-		list_splice_init(&pool->clean_list, &kill_list);
-	spin_unlock_irqrestore(&pool->list_lock, flags);
-
-	/* Batched invalidate of dirty MRs.
-	 * For FMR based MRs, the mappings on the unmap list are
-	 * actually members of an ibmr (ibmr->mapping). They either
-	 * migrate to the kill_list, or have been cleaned and should be
-	 * moved to the clean_list.
-	 * For fastregs, they will be dynamically allocated, and
-	 * will be destroyed by the unmap function.
-	 */
-	if (!list_empty(&unmap_list)) {
-		ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list,
-						     &kill_list, &unpinned);
-		/* If we've been asked to destroy all MRs, move those
-		 * that were simply cleaned to the kill list */
-		if (free_all)
-			list_splice_init(&unmap_list, &kill_list);
-	}
-
-	/* Destroy any MRs that are past their best before date */
-	list_for_each_entry_safe(ibmr, next, &kill_list, mapping.m_list) {
-		rds_iw_stats_inc(s_iw_rdma_mr_free);
-		list_del(&ibmr->mapping.m_list);
-		rds_iw_destroy_fastreg(pool, ibmr);
-		kfree(ibmr);
-		nfreed++;
-	}
-
-	/* Anything that remains are laundered ibmrs, which we can add
-	 * back to the clean list. */
-	if (!list_empty(&unmap_list)) {
-		spin_lock_irqsave(&pool->list_lock, flags);
-		list_splice(&unmap_list, &pool->clean_list);
-		spin_unlock_irqrestore(&pool->list_lock, flags);
-	}
-
-	atomic_sub(unpinned, &pool->free_pinned);
-	atomic_sub(ncleaned, &pool->dirty_count);
-	atomic_sub(nfreed, &pool->item_count);
-
-	mutex_unlock(&pool->flush_lock);
-}
-
-static void rds_iw_mr_pool_flush_worker(struct work_struct *work)
-{
-	struct rds_iw_mr_pool *pool = container_of(work, struct rds_iw_mr_pool, flush_worker);
-
-	rds_iw_flush_mr_pool(pool, 0);
-}
-
-void rds_iw_free_mr(void *trans_private, int invalidate)
-{
-	struct rds_iw_mr *ibmr = trans_private;
-	struct rds_iw_mr_pool *pool = ibmr->device->mr_pool;
-
-	rdsdebug("RDS/IW: free_mr nents %u\n", ibmr->mapping.m_sg.len);
-	if (!pool)
-		return;
-
-	/* Return it to the pool's free list */
-	rds_iw_free_fastreg(pool, ibmr);
-
-	/* If we've pinned too many pages, request a flush */
-	if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned ||
-	    atomic_read(&pool->dirty_count) >= pool->max_items / 10)
-		queue_work(rds_wq, &pool->flush_worker);
-
-	if (invalidate) {
-		if (likely(!in_interrupt())) {
-			rds_iw_flush_mr_pool(pool, 0);
-		} else {
-			/* We get here if the user created a MR marked
-			 * as use_once and invalidate at the same time. */
-			queue_work(rds_wq, &pool->flush_worker);
-		}
-	}
-}
-
-void rds_iw_flush_mrs(void)
-{
-	struct rds_iw_device *rds_iwdev;
-
-	list_for_each_entry(rds_iwdev, &rds_iw_devices, list) {
-		struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool;
-
-		if (pool)
-			rds_iw_flush_mr_pool(pool, 0);
-	}
-}
-
-void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents,
-		    struct rds_sock *rs, u32 *key_ret)
-{
-	struct rds_iw_device *rds_iwdev;
-	struct rds_iw_mr *ibmr = NULL;
-	struct rdma_cm_id *cm_id;
-	struct sockaddr_in src = {
-		.sin_addr.s_addr = rs->rs_bound_addr,
-		.sin_port = rs->rs_bound_port,
-	};
-	struct sockaddr_in dst = {
-		.sin_addr.s_addr = rs->rs_conn_addr,
-		.sin_port = rs->rs_conn_port,
-	};
-	int ret;
-
-	ret = rds_iw_get_device(&src, &dst, &rds_iwdev, &cm_id);
-	if (ret || !cm_id) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	if (!rds_iwdev->mr_pool) {
-		ret = -ENODEV;
-		goto out;
-	}
-
-	ibmr = rds_iw_alloc_mr(rds_iwdev);
-	if (IS_ERR(ibmr))
-		return ibmr;
-
-	ibmr->cm_id = cm_id;
-	ibmr->device = rds_iwdev;
-
-	ret = rds_iw_map_reg(rds_iwdev->mr_pool, ibmr, sg, nents);
-	if (ret == 0)
-		*key_ret = ibmr->mr->rkey;
-	else
-		printk(KERN_WARNING "RDS/IW: failed to map mr (errno=%d)\n", ret);
-
-out:
-	if (ret) {
-		if (ibmr)
-			rds_iw_free_mr(ibmr, 0);
-		ibmr = ERR_PTR(ret);
-	}
-	return ibmr;
-}
-
-/*
- * iWARP reg handling
- *
- * The life cycle of a fastreg registration is a bit different from
- * FMRs.
- * The idea behind fastreg is to have one MR, to which we bind different
- * mappings over time. To avoid stalling on the expensive map and invalidate
- * operations, these operations are pipelined on the same send queue on
- * which we want to send the message containing the r_key.
- *
- * This creates a bit of a problem for us, as we do not have the destination
- * IP in GET_MR, so the connection must be setup prior to the GET_MR call for
- * RDMA to be correctly setup.  If a fastreg request is present, rds_iw_xmit
- * will try to queue a LOCAL_INV (if needed) and a REG_MR work request
- * before queuing the SEND. When completions for these arrive, they are
- * dispatched to the MR has a bit set showing that RDMa can be performed.
- *
- * There is another interesting aspect that's related to invalidation.
- * The application can request that a mapping is invalidated in FREE_MR.
- * The expectation there is that this invalidation step includes ALL
- * PREVIOUSLY FREED MRs.
- */
-static int rds_iw_init_reg(struct rds_iw_mr_pool *pool,
-			   struct rds_iw_mr *ibmr)
-{
-	struct rds_iw_device *rds_iwdev = pool->device;
-	struct ib_mr *mr;
-	int err;
-
-	mr = ib_alloc_mr(rds_iwdev->pd, IB_MR_TYPE_MEM_REG,
-			 pool->max_message_size);
-	if (IS_ERR(mr)) {
-		err = PTR_ERR(mr);
-
-		printk(KERN_WARNING "RDS/IW: ib_alloc_mr failed (err=%d)\n", err);
-		return err;
-	}
-
-	ibmr->mr = mr;
-	return 0;
-}
-
-static int rds_iw_rdma_reg_mr(struct rds_iw_mapping *mapping)
-{
-	struct rds_iw_mr *ibmr = mapping->m_mr;
-	struct rds_iw_scatterlist *m_sg = &mapping->m_sg;
-	struct ib_reg_wr reg_wr;
-	struct ib_send_wr *failed_wr;
-	int ret, n;
-
-	n = ib_map_mr_sg_zbva(ibmr->mr, m_sg->list, m_sg->len, PAGE_SIZE);
-	if (unlikely(n != m_sg->len))
-		return n < 0 ? n : -EINVAL;
-
-	reg_wr.wr.next = NULL;
-	reg_wr.wr.opcode = IB_WR_REG_MR;
-	reg_wr.wr.wr_id = RDS_IW_REG_WR_ID;
-	reg_wr.wr.num_sge = 0;
-	reg_wr.mr = ibmr->mr;
-	reg_wr.key = mapping->m_rkey;
-	reg_wr.access = IB_ACCESS_LOCAL_WRITE |
-			IB_ACCESS_REMOTE_READ |
-			IB_ACCESS_REMOTE_WRITE;
-
-	/*
-	 * Perform a WR for the reg_mr. Each individual page
-	 * in the sg list is added to the fast reg page list and placed
-	 * inside the reg_mr WR.  The key used is a rolling 8bit
-	 * counter, which should guarantee uniqueness.
-	 */
-	ib_update_fast_reg_key(ibmr->mr, ibmr->remap_count++);
-	mapping->m_rkey = ibmr->mr->rkey;
-
-	failed_wr = &reg_wr.wr;
-	ret = ib_post_send(ibmr->cm_id->qp, &reg_wr.wr, &failed_wr);
-	BUG_ON(failed_wr != &reg_wr.wr);
-	if (ret)
-		printk_ratelimited(KERN_WARNING "RDS/IW: %s:%d ib_post_send returned %d\n",
-			__func__, __LINE__, ret);
-	return ret;
-}
-
-static int rds_iw_rdma_fastreg_inv(struct rds_iw_mr *ibmr)
-{
-	struct ib_send_wr s_wr, *failed_wr;
-	int ret = 0;
-
-	if (!ibmr->cm_id->qp || !ibmr->mr)
-		goto out;
-
-	memset(&s_wr, 0, sizeof(s_wr));
-	s_wr.wr_id = RDS_IW_LOCAL_INV_WR_ID;
-	s_wr.opcode = IB_WR_LOCAL_INV;
-	s_wr.ex.invalidate_rkey = ibmr->mr->rkey;
-	s_wr.send_flags = IB_SEND_SIGNALED;
-
-	failed_wr = &s_wr;
-	ret = ib_post_send(ibmr->cm_id->qp, &s_wr, &failed_wr);
-	if (ret) {
-		printk_ratelimited(KERN_WARNING "RDS/IW: %s:%d ib_post_send returned %d\n",
-			__func__, __LINE__, ret);
-		goto out;
-	}
-out:
-	return ret;
-}
-
-static int rds_iw_map_reg(struct rds_iw_mr_pool *pool,
-			  struct rds_iw_mr *ibmr,
-			  struct scatterlist *sg,
-			  unsigned int sg_len)
-{
-	struct rds_iw_device *rds_iwdev = pool->device;
-	struct rds_iw_mapping *mapping = &ibmr->mapping;
-	u64 *dma_pages;
-	int ret = 0;
-
-	rds_iw_set_scatterlist(&mapping->m_sg, sg, sg_len);
-
-	ret = rds_iw_map_scatterlist(rds_iwdev, &mapping->m_sg);
-	if (ret) {
-		dma_pages = NULL;
-		goto out;
-	}
-
-	if (mapping->m_sg.dma_len > pool->max_message_size) {
-		ret = -EMSGSIZE;
-		goto out;
-	}
-
-	ret = rds_iw_rdma_reg_mr(mapping);
-	if (ret)
-		goto out;
-
-	rds_iw_stats_inc(s_iw_rdma_mr_used);
-
-out:
-	kfree(dma_pages);
-
-	return ret;
-}
-
-/*
- * "Free" a fastreg MR.
- */
-static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool,
-		struct rds_iw_mr *ibmr)
-{
-	unsigned long flags;
-	int ret;
-
-	if (!ibmr->mapping.m_sg.dma_len)
-		return;
-
-	ret = rds_iw_rdma_fastreg_inv(ibmr);
-	if (ret)
-		return;
-
-	/* Try to post the LOCAL_INV WR to the queue. */
-	spin_lock_irqsave(&pool->list_lock, flags);
-
-	list_add_tail(&ibmr->mapping.m_list, &pool->dirty_list);
-	atomic_add(ibmr->mapping.m_sg.len, &pool->free_pinned);
-	atomic_inc(&pool->dirty_count);
-
-	spin_unlock_irqrestore(&pool->list_lock, flags);
-}
-
-static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool,
-				struct list_head *unmap_list,
-				struct list_head *kill_list,
-				int *unpinned)
-{
-	struct rds_iw_mapping *mapping, *next;
-	unsigned int ncleaned = 0;
-	LIST_HEAD(laundered);
-
-	/* Batched invalidation of fastreg MRs.
-	 * Why do we do it this way, even though we could pipeline unmap
-	 * and remap? The reason is the application semantics - when the
-	 * application requests an invalidation of MRs, it expects all
-	 * previously released R_Keys to become invalid.
-	 *
-	 * If we implement MR reuse naively, we risk memory corruption
-	 * (this has actually been observed). So the default behavior
-	 * requires that a MR goes through an explicit unmap operation before
-	 * we can reuse it again.
-	 *
-	 * We could probably improve on this a little, by allowing immediate
-	 * reuse of a MR on the same socket (eg you could add small
-	 * cache of unused MRs to strct rds_socket - GET_MR could grab one
-	 * of these without requiring an explicit invalidate).
-	 */
-	while (!list_empty(unmap_list)) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&pool->list_lock, flags);
-		list_for_each_entry_safe(mapping, next, unmap_list, m_list) {
-			*unpinned += mapping->m_sg.len;
-			list_move(&mapping->m_list, &laundered);
-			ncleaned++;
-		}
-		spin_unlock_irqrestore(&pool->list_lock, flags);
-	}
-
-	/* Move all laundered mappings back to the unmap list.
-	 * We do not kill any WRs right now - it doesn't seem the
-	 * fastreg API has a max_remap limit. */
-	list_splice_init(&laundered, unmap_list);
-
-	return ncleaned;
-}
-
-static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool,
-		struct rds_iw_mr *ibmr)
-{
-	if (ibmr->mr)
-		ib_dereg_mr(ibmr->mr);
-}