diff options
Diffstat (limited to 'net/rds/iw_rdma.c')
| -rw-r--r-- | net/rds/iw_rdma.c | 837 |
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 b09a40c1adce..000000000000 --- 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 = ®_wr.wr; - ret = ib_post_send(ibmr->cm_id->qp, ®_wr.wr, &failed_wr); - BUG_ON(failed_wr != ®_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); -} |