RDS/IB: Implement RDMA ops using FMRs
Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Grover
David S. Miller
Родитель
f528efe276
Коммит
08b48a1ed8
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@ -0,0 +1,641 @@
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/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/kernel.h>
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#include "rds.h"
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#include "rdma.h"
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#include "ib.h"
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/*
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* This is stored as mr->r_trans_private.
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*/
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struct rds_ib_mr {
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struct rds_ib_device *device;
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struct rds_ib_mr_pool *pool;
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struct ib_fmr *fmr;
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struct list_head list;
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unsigned int remap_count;
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struct scatterlist *sg;
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unsigned int sg_len;
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u64 *dma;
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int sg_dma_len;
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};
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/*
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* Our own little FMR pool
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*/
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struct rds_ib_mr_pool {
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struct mutex flush_lock; /* serialize fmr invalidate */
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struct work_struct flush_worker; /* flush worker */
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spinlock_t list_lock; /* protect variables below */
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atomic_t item_count; /* total # of MRs */
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atomic_t dirty_count; /* # dirty of MRs */
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struct list_head drop_list; /* MRs that have reached their max_maps limit */
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struct list_head free_list; /* unused MRs */
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struct list_head clean_list; /* unused & unamapped MRs */
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atomic_t free_pinned; /* memory pinned by free MRs */
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unsigned long max_items;
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unsigned long max_items_soft;
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unsigned long max_free_pinned;
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struct ib_fmr_attr fmr_attr;
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};
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static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all);
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static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr);
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static void rds_ib_mr_pool_flush_worker(struct work_struct *work);
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static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr)
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{
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struct rds_ib_device *rds_ibdev;
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struct rds_ib_ipaddr *i_ipaddr;
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list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
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spin_lock_irq(&rds_ibdev->spinlock);
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list_for_each_entry(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
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if (i_ipaddr->ipaddr == ipaddr) {
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spin_unlock_irq(&rds_ibdev->spinlock);
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return rds_ibdev;
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}
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}
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spin_unlock_irq(&rds_ibdev->spinlock);
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}
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return NULL;
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}
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static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
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{
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struct rds_ib_ipaddr *i_ipaddr;
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i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL);
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if (!i_ipaddr)
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return -ENOMEM;
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i_ipaddr->ipaddr = ipaddr;
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spin_lock_irq(&rds_ibdev->spinlock);
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list_add_tail(&i_ipaddr->list, &rds_ibdev->ipaddr_list);
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spin_unlock_irq(&rds_ibdev->spinlock);
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return 0;
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}
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static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
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{
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struct rds_ib_ipaddr *i_ipaddr, *next;
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spin_lock_irq(&rds_ibdev->spinlock);
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list_for_each_entry_safe(i_ipaddr, next, &rds_ibdev->ipaddr_list, list) {
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if (i_ipaddr->ipaddr == ipaddr) {
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list_del(&i_ipaddr->list);
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kfree(i_ipaddr);
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break;
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}
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}
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spin_unlock_irq(&rds_ibdev->spinlock);
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}
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int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
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{
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struct rds_ib_device *rds_ibdev_old;
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rds_ibdev_old = rds_ib_get_device(ipaddr);
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if (rds_ibdev_old)
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rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr);
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return rds_ib_add_ipaddr(rds_ibdev, ipaddr);
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}
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int rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)
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{
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struct rds_ib_connection *ic = conn->c_transport_data;
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/* conn was previously on the nodev_conns_list */
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spin_lock_irq(&ib_nodev_conns_lock);
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BUG_ON(list_empty(&ib_nodev_conns));
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BUG_ON(list_empty(&ic->ib_node));
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list_del(&ic->ib_node);
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spin_unlock_irq(&ib_nodev_conns_lock);
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spin_lock_irq(&rds_ibdev->spinlock);
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list_add_tail(&ic->ib_node, &rds_ibdev->conn_list);
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spin_unlock_irq(&rds_ibdev->spinlock);
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ic->rds_ibdev = rds_ibdev;
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return 0;
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}
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void rds_ib_remove_nodev_conns(void)
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{
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struct rds_ib_connection *ic, *_ic;
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LIST_HEAD(tmp_list);
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/* avoid calling conn_destroy with irqs off */
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spin_lock_irq(&ib_nodev_conns_lock);
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list_splice(&ib_nodev_conns, &tmp_list);
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INIT_LIST_HEAD(&ib_nodev_conns);
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spin_unlock_irq(&ib_nodev_conns_lock);
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list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node) {
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if (ic->conn->c_passive)
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rds_conn_destroy(ic->conn->c_passive);
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rds_conn_destroy(ic->conn);
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}
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}
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void rds_ib_remove_conns(struct rds_ib_device *rds_ibdev)
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{
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struct rds_ib_connection *ic, *_ic;
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LIST_HEAD(tmp_list);
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/* avoid calling conn_destroy with irqs off */
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spin_lock_irq(&rds_ibdev->spinlock);
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list_splice(&rds_ibdev->conn_list, &tmp_list);
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INIT_LIST_HEAD(&rds_ibdev->conn_list);
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spin_unlock_irq(&rds_ibdev->spinlock);
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list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node) {
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if (ic->conn->c_passive)
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rds_conn_destroy(ic->conn->c_passive);
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rds_conn_destroy(ic->conn);
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}
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}
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struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev)
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{
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struct rds_ib_mr_pool *pool;
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pool = kzalloc(sizeof(*pool), GFP_KERNEL);
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if (!pool)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&pool->free_list);
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INIT_LIST_HEAD(&pool->drop_list);
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INIT_LIST_HEAD(&pool->clean_list);
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mutex_init(&pool->flush_lock);
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spin_lock_init(&pool->list_lock);
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INIT_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);
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pool->fmr_attr.max_pages = fmr_message_size;
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pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
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pool->fmr_attr.page_shift = rds_ibdev->fmr_page_shift;
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pool->max_free_pinned = rds_ibdev->max_fmrs * fmr_message_size / 4;
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/* We never allow more than max_items MRs to be allocated.
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* When we exceed more than max_items_soft, we start freeing
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* items more aggressively.
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* Make sure that max_items > max_items_soft > max_items / 2
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*/
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pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4;
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pool->max_items = rds_ibdev->max_fmrs;
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return pool;
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}
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void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo)
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{
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struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
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iinfo->rdma_mr_max = pool->max_items;
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iinfo->rdma_mr_size = pool->fmr_attr.max_pages;
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}
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void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool)
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{
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flush_workqueue(rds_wq);
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rds_ib_flush_mr_pool(pool, 1);
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BUG_ON(atomic_read(&pool->item_count));
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BUG_ON(atomic_read(&pool->free_pinned));
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kfree(pool);
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}
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static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool)
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{
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struct rds_ib_mr *ibmr = NULL;
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unsigned long flags;
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spin_lock_irqsave(&pool->list_lock, flags);
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if (!list_empty(&pool->clean_list)) {
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ibmr = list_entry(pool->clean_list.next, struct rds_ib_mr, list);
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list_del_init(&ibmr->list);
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}
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spin_unlock_irqrestore(&pool->list_lock, flags);
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return ibmr;
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}
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static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev)
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{
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struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
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struct rds_ib_mr *ibmr = NULL;
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int err = 0, iter = 0;
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while (1) {
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ibmr = rds_ib_reuse_fmr(pool);
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if (ibmr)
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return ibmr;
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/* No clean MRs - now we have the choice of either
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* allocating a fresh MR up to the limit imposed by the
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* driver, or flush any dirty unused MRs.
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* We try to avoid stalling in the send path if possible,
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* so we allocate as long as we're allowed to.
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*
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* We're fussy with enforcing the FMR limit, though. If the driver
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* tells us we can't use more than N fmrs, we shouldn't start
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* arguing with it */
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if (atomic_inc_return(&pool->item_count) <= pool->max_items)
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break;
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atomic_dec(&pool->item_count);
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if (++iter > 2) {
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rds_ib_stats_inc(s_ib_rdma_mr_pool_depleted);
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return ERR_PTR(-EAGAIN);
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}
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/* We do have some empty MRs. Flush them out. */
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rds_ib_stats_inc(s_ib_rdma_mr_pool_wait);
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rds_ib_flush_mr_pool(pool, 0);
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}
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ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL);
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if (!ibmr) {
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err = -ENOMEM;
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goto out_no_cigar;
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}
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ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
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(IB_ACCESS_LOCAL_WRITE |
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IB_ACCESS_REMOTE_READ |
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IB_ACCESS_REMOTE_WRITE),
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&pool->fmr_attr);
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if (IS_ERR(ibmr->fmr)) {
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err = PTR_ERR(ibmr->fmr);
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ibmr->fmr = NULL;
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printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err);
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goto out_no_cigar;
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}
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rds_ib_stats_inc(s_ib_rdma_mr_alloc);
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return ibmr;
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out_no_cigar:
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if (ibmr) {
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if (ibmr->fmr)
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ib_dealloc_fmr(ibmr->fmr);
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kfree(ibmr);
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}
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atomic_dec(&pool->item_count);
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return ERR_PTR(err);
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}
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|
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static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr,
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struct scatterlist *sg, unsigned int nents)
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{
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struct ib_device *dev = rds_ibdev->dev;
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struct scatterlist *scat = sg;
|
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u64 io_addr = 0;
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u64 *dma_pages;
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u32 len;
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int page_cnt, sg_dma_len;
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int i, j;
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int ret;
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sg_dma_len = ib_dma_map_sg(dev, sg, nents,
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DMA_BIDIRECTIONAL);
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if (unlikely(!sg_dma_len)) {
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printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n");
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return -EBUSY;
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}
|
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|
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len = 0;
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page_cnt = 0;
|
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|
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for (i = 0; i < sg_dma_len; ++i) {
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unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
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u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
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|
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if (dma_addr & ~rds_ibdev->fmr_page_mask) {
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if (i > 0)
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return -EINVAL;
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else
|
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++page_cnt;
|
||||
}
|
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if ((dma_addr + dma_len) & ~rds_ibdev->fmr_page_mask) {
|
||||
if (i < sg_dma_len - 1)
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return -EINVAL;
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else
|
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++page_cnt;
|
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}
|
||||
|
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len += dma_len;
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}
|
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|
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page_cnt += len >> rds_ibdev->fmr_page_shift;
|
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if (page_cnt > fmr_message_size)
|
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return -EINVAL;
|
||||
|
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dma_pages = kmalloc(sizeof(u64) * page_cnt, GFP_ATOMIC);
|
||||
if (!dma_pages)
|
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return -ENOMEM;
|
||||
|
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page_cnt = 0;
|
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for (i = 0; i < sg_dma_len; ++i) {
|
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unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
|
||||
u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
|
||||
|
||||
for (j = 0; j < dma_len; j += rds_ibdev->fmr_page_size)
|
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dma_pages[page_cnt++] =
|
||||
(dma_addr & rds_ibdev->fmr_page_mask) + j;
|
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}
|
||||
|
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ret = ib_map_phys_fmr(ibmr->fmr,
|
||||
dma_pages, page_cnt, io_addr);
|
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if (ret)
|
||||
goto out;
|
||||
|
||||
/* Success - we successfully remapped the MR, so we can
|
||||
* safely tear down the old mapping. */
|
||||
rds_ib_teardown_mr(ibmr);
|
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|
||||
ibmr->sg = scat;
|
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ibmr->sg_len = nents;
|
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ibmr->sg_dma_len = sg_dma_len;
|
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ibmr->remap_count++;
|
||||
|
||||
rds_ib_stats_inc(s_ib_rdma_mr_used);
|
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ret = 0;
|
||||
|
||||
out:
|
||||
kfree(dma_pages);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
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void rds_ib_sync_mr(void *trans_private, int direction)
|
||||
{
|
||||
struct rds_ib_mr *ibmr = trans_private;
|
||||
struct rds_ib_device *rds_ibdev = ibmr->device;
|
||||
|
||||
switch (direction) {
|
||||
case DMA_FROM_DEVICE:
|
||||
ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg,
|
||||
ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
|
||||
break;
|
||||
case DMA_TO_DEVICE:
|
||||
ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg,
|
||||
ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
|
||||
{
|
||||
struct rds_ib_device *rds_ibdev = ibmr->device;
|
||||
|
||||
if (ibmr->sg_dma_len) {
|
||||
ib_dma_unmap_sg(rds_ibdev->dev,
|
||||
ibmr->sg, ibmr->sg_len,
|
||||
DMA_BIDIRECTIONAL);
|
||||
ibmr->sg_dma_len = 0;
|
||||
}
|
||||
|
||||
/* Release the s/g list */
|
||||
if (ibmr->sg_len) {
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < ibmr->sg_len; ++i) {
|
||||
struct page *page = sg_page(&ibmr->sg[i]);
|
||||
|
||||
/* FIXME we need a way to tell a r/w MR
|
||||
* from a r/o MR */
|
||||
set_page_dirty(page);
|
||||
put_page(page);
|
||||
}
|
||||
kfree(ibmr->sg);
|
||||
|
||||
ibmr->sg = NULL;
|
||||
ibmr->sg_len = 0;
|
||||
}
|
||||
}
|
||||
|
||||
static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
|
||||
{
|
||||
unsigned int pinned = ibmr->sg_len;
|
||||
|
||||
__rds_ib_teardown_mr(ibmr);
|
||||
if (pinned) {
|
||||
struct rds_ib_device *rds_ibdev = ibmr->device;
|
||||
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
|
||||
|
||||
atomic_sub(pinned, &pool->free_pinned);
|
||||
}
|
||||
}
|
||||
|
||||
static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all)
|
||||
{
|
||||
unsigned int item_count;
|
||||
|
||||
item_count = atomic_read(&pool->item_count);
|
||||
if (free_all)
|
||||
return item_count;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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 int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all)
|
||||
{
|
||||
struct rds_ib_mr *ibmr, *next;
|
||||
LIST_HEAD(unmap_list);
|
||||
LIST_HEAD(fmr_list);
|
||||
unsigned long unpinned = 0;
|
||||
unsigned long flags;
|
||||
unsigned int nfreed = 0, ncleaned = 0, free_goal;
|
||||
int ret = 0;
|
||||
|
||||
rds_ib_stats_inc(s_ib_rdma_mr_pool_flush);
|
||||
|
||||
mutex_lock(&pool->flush_lock);
|
||||
|
||||
spin_lock_irqsave(&pool->list_lock, flags);
|
||||
/* Get the list of all MRs to be dropped. Ordering matters -
|
||||
* we want to put drop_list ahead of free_list. */
|
||||
list_splice_init(&pool->free_list, &unmap_list);
|
||||
list_splice_init(&pool->drop_list, &unmap_list);
|
||||
if (free_all)
|
||||
list_splice_init(&pool->clean_list, &unmap_list);
|
||||
spin_unlock_irqrestore(&pool->list_lock, flags);
|
||||
|
||||
free_goal = rds_ib_flush_goal(pool, free_all);
|
||||
|
||||
if (list_empty(&unmap_list))
|
||||
goto out;
|
||||
|
||||
/* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
|
||||
list_for_each_entry(ibmr, &unmap_list, list)
|
||||
list_add(&ibmr->fmr->list, &fmr_list);
|
||||
ret = ib_unmap_fmr(&fmr_list);
|
||||
if (ret)
|
||||
printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret);
|
||||
|
||||
/* Now we can destroy the DMA mapping and unpin any pages */
|
||||
list_for_each_entry_safe(ibmr, next, &unmap_list, list) {
|
||||
unpinned += ibmr->sg_len;
|
||||
__rds_ib_teardown_mr(ibmr);
|
||||
if (nfreed < free_goal || ibmr->remap_count >= pool->fmr_attr.max_maps) {
|
||||
rds_ib_stats_inc(s_ib_rdma_mr_free);
|
||||
list_del(&ibmr->list);
|
||||
ib_dealloc_fmr(ibmr->fmr);
|
||||
kfree(ibmr);
|
||||
nfreed++;
|
||||
}
|
||||
ncleaned++;
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
out:
|
||||
mutex_unlock(&pool->flush_lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
|
||||
{
|
||||
struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker);
|
||||
|
||||
rds_ib_flush_mr_pool(pool, 0);
|
||||
}
|
||||
|
||||
void rds_ib_free_mr(void *trans_private, int invalidate)
|
||||
{
|
||||
struct rds_ib_mr *ibmr = trans_private;
|
||||
struct rds_ib_device *rds_ibdev = ibmr->device;
|
||||
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
|
||||
unsigned long flags;
|
||||
|
||||
rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
|
||||
|
||||
/* Return it to the pool's free list */
|
||||
spin_lock_irqsave(&pool->list_lock, flags);
|
||||
if (ibmr->remap_count >= pool->fmr_attr.max_maps)
|
||||
list_add(&ibmr->list, &pool->drop_list);
|
||||
else
|
||||
list_add(&ibmr->list, &pool->free_list);
|
||||
|
||||
atomic_add(ibmr->sg_len, &pool->free_pinned);
|
||||
atomic_inc(&pool->dirty_count);
|
||||
spin_unlock_irqrestore(&pool->list_lock, flags);
|
||||
|
||||
/* 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_ib_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_ib_flush_mrs(void)
|
||||
{
|
||||
struct rds_ib_device *rds_ibdev;
|
||||
|
||||
list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
|
||||
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
|
||||
|
||||
if (pool)
|
||||
rds_ib_flush_mr_pool(pool, 0);
|
||||
}
|
||||
}
|
||||
|
||||
void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
|
||||
struct rds_sock *rs, u32 *key_ret)
|
||||
{
|
||||
struct rds_ib_device *rds_ibdev;
|
||||
struct rds_ib_mr *ibmr = NULL;
|
||||
int ret;
|
||||
|
||||
rds_ibdev = rds_ib_get_device(rs->rs_bound_addr);
|
||||
if (!rds_ibdev) {
|
||||
ret = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (!rds_ibdev->mr_pool) {
|
||||
ret = -ENODEV;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ibmr = rds_ib_alloc_fmr(rds_ibdev);
|
||||
if (IS_ERR(ibmr))
|
||||
return ibmr;
|
||||
|
||||
ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
|
||||
if (ret == 0)
|
||||
*key_ret = ibmr->fmr->rkey;
|
||||
else
|
||||
printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
|
||||
|
||||
ibmr->device = rds_ibdev;
|
||||
|
||||
out:
|
||||
if (ret) {
|
||||
if (ibmr)
|
||||
rds_ib_free_mr(ibmr, 0);
|
||||
ibmr = ERR_PTR(ret);
|
||||
}
|
||||
return ibmr;
|
||||
}
|
||||
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