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-rw-r--r--net/rds/iw_rdma.c837
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);
-}
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