![Chuck Lever](/assets/img/avatar_default.png)
With FRWR, the client transport can perform memory registration and post a Send with just a single ib_post_send. This reduces contention between the send_request path and the Send Completion handlers, and reduces the overhead of registering a chunk that has multiple segments. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
593 lines
16 KiB
C
593 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2015, 2017 Oracle. All rights reserved.
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* Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
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*/
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/* Lightweight memory registration using Fast Registration Work
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* Requests (FRWR).
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*
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* FRWR features ordered asynchronous registration and deregistration
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* of arbitrarily sized memory regions. This is the fastest and safest
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* but most complex memory registration mode.
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*/
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/* Normal operation
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*
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* A Memory Region is prepared for RDMA READ or WRITE using a FAST_REG
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* Work Request (frwr_op_map). When the RDMA operation is finished, this
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* Memory Region is invalidated using a LOCAL_INV Work Request
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* (frwr_op_unmap_sync).
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*
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* Typically these Work Requests are not signaled, and neither are RDMA
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* SEND Work Requests (with the exception of signaling occasionally to
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* prevent provider work queue overflows). This greatly reduces HCA
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* interrupt workload.
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*
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* As an optimization, frwr_op_unmap marks MRs INVALID before the
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* LOCAL_INV WR is posted. If posting succeeds, the MR is placed on
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* rb_mrs immediately so that no work (like managing a linked list
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* under a spinlock) is needed in the completion upcall.
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*
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* But this means that frwr_op_map() can occasionally encounter an MR
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* that is INVALID but the LOCAL_INV WR has not completed. Work Queue
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* ordering prevents a subsequent FAST_REG WR from executing against
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* that MR while it is still being invalidated.
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*/
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/* Transport recovery
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*
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* ->op_map and the transport connect worker cannot run at the same
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* time, but ->op_unmap can fire while the transport connect worker
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* is running. Thus MR recovery is handled in ->op_map, to guarantee
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* that recovered MRs are owned by a sending RPC, and not one where
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* ->op_unmap could fire at the same time transport reconnect is
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* being done.
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*
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* When the underlying transport disconnects, MRs are left in one of
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* four states:
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*
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* INVALID: The MR was not in use before the QP entered ERROR state.
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*
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* VALID: The MR was registered before the QP entered ERROR state.
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*
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* FLUSHED_FR: The MR was being registered when the QP entered ERROR
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* state, and the pending WR was flushed.
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*
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* FLUSHED_LI: The MR was being invalidated when the QP entered ERROR
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* state, and the pending WR was flushed.
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*
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* When frwr_op_map encounters FLUSHED and VALID MRs, they are recovered
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* with ib_dereg_mr and then are re-initialized. Because MR recovery
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* allocates fresh resources, it is deferred to a workqueue, and the
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* recovered MRs are placed back on the rb_mrs list when recovery is
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* complete. frwr_op_map allocates another MR for the current RPC while
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* the broken MR is reset.
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*
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* To ensure that frwr_op_map doesn't encounter an MR that is marked
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* INVALID but that is about to be flushed due to a previous transport
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* disconnect, the transport connect worker attempts to drain all
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* pending send queue WRs before the transport is reconnected.
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*/
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#include <linux/sunrpc/rpc_rdma.h>
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#include "xprt_rdma.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# define RPCDBG_FACILITY RPCDBG_TRANS
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#endif
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bool
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frwr_is_supported(struct rpcrdma_ia *ia)
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{
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struct ib_device_attr *attrs = &ia->ri_device->attrs;
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if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
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goto out_not_supported;
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if (attrs->max_fast_reg_page_list_len == 0)
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goto out_not_supported;
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return true;
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out_not_supported:
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pr_info("rpcrdma: 'frwr' mode is not supported by device %s\n",
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ia->ri_device->name);
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return false;
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}
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static int
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frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
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{
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unsigned int depth = ia->ri_max_frwr_depth;
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struct rpcrdma_frwr *frwr = &mr->frwr;
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int rc;
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frwr->fr_mr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype, depth);
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if (IS_ERR(frwr->fr_mr))
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goto out_mr_err;
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mr->mr_sg = kcalloc(depth, sizeof(*mr->mr_sg), GFP_KERNEL);
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if (!mr->mr_sg)
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goto out_list_err;
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sg_init_table(mr->mr_sg, depth);
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init_completion(&frwr->fr_linv_done);
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return 0;
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out_mr_err:
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rc = PTR_ERR(frwr->fr_mr);
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dprintk("RPC: %s: ib_alloc_mr status %i\n",
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__func__, rc);
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return rc;
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out_list_err:
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rc = -ENOMEM;
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dprintk("RPC: %s: sg allocation failure\n",
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__func__);
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ib_dereg_mr(frwr->fr_mr);
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return rc;
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}
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static void
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frwr_op_release_mr(struct rpcrdma_mr *mr)
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{
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int rc;
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/* Ensure MR is not on any rl_registered list */
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if (!list_empty(&mr->mr_list))
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list_del(&mr->mr_list);
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rc = ib_dereg_mr(mr->frwr.fr_mr);
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if (rc)
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pr_err("rpcrdma: final ib_dereg_mr for %p returned %i\n",
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mr, rc);
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kfree(mr->mr_sg);
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kfree(mr);
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}
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static int
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__frwr_mr_reset(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
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{
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struct rpcrdma_frwr *frwr = &mr->frwr;
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int rc;
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rc = ib_dereg_mr(frwr->fr_mr);
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if (rc) {
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pr_warn("rpcrdma: ib_dereg_mr status %d, frwr %p orphaned\n",
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rc, mr);
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return rc;
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}
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frwr->fr_mr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype,
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ia->ri_max_frwr_depth);
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if (IS_ERR(frwr->fr_mr)) {
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pr_warn("rpcrdma: ib_alloc_mr status %ld, frwr %p orphaned\n",
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PTR_ERR(frwr->fr_mr), mr);
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return PTR_ERR(frwr->fr_mr);
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}
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dprintk("RPC: %s: recovered FRWR %p\n", __func__, frwr);
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frwr->fr_state = FRWR_IS_INVALID;
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return 0;
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}
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/* Reset of a single FRWR. Generate a fresh rkey by replacing the MR.
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*/
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static void
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frwr_op_recover_mr(struct rpcrdma_mr *mr)
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{
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enum rpcrdma_frwr_state state = mr->frwr.fr_state;
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struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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int rc;
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rc = __frwr_mr_reset(ia, mr);
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if (state != FRWR_FLUSHED_LI) {
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trace_xprtrdma_dma_unmap(mr);
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ib_dma_unmap_sg(ia->ri_device,
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mr->mr_sg, mr->mr_nents, mr->mr_dir);
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}
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if (rc)
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goto out_release;
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rpcrdma_mr_put(mr);
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r_xprt->rx_stats.mrs_recovered++;
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return;
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out_release:
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pr_err("rpcrdma: FRWR reset failed %d, %p release\n", rc, mr);
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r_xprt->rx_stats.mrs_orphaned++;
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spin_lock(&r_xprt->rx_buf.rb_mrlock);
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list_del(&mr->mr_all);
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spin_unlock(&r_xprt->rx_buf.rb_mrlock);
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frwr_op_release_mr(mr);
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}
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static int
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frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
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struct rpcrdma_create_data_internal *cdata)
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{
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struct ib_device_attr *attrs = &ia->ri_device->attrs;
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int depth, delta;
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ia->ri_mrtype = IB_MR_TYPE_MEM_REG;
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if (attrs->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
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ia->ri_mrtype = IB_MR_TYPE_SG_GAPS;
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ia->ri_max_frwr_depth =
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min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
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attrs->max_fast_reg_page_list_len);
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dprintk("RPC: %s: device's max FR page list len = %u\n",
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__func__, ia->ri_max_frwr_depth);
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/* Add room for frwr register and invalidate WRs.
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* 1. FRWR reg WR for head
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* 2. FRWR invalidate WR for head
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* 3. N FRWR reg WRs for pagelist
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* 4. N FRWR invalidate WRs for pagelist
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* 5. FRWR reg WR for tail
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* 6. FRWR invalidate WR for tail
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* 7. The RDMA_SEND WR
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*/
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depth = 7;
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/* Calculate N if the device max FRWR depth is smaller than
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* RPCRDMA_MAX_DATA_SEGS.
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*/
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if (ia->ri_max_frwr_depth < RPCRDMA_MAX_DATA_SEGS) {
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delta = RPCRDMA_MAX_DATA_SEGS - ia->ri_max_frwr_depth;
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do {
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depth += 2; /* FRWR reg + invalidate */
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delta -= ia->ri_max_frwr_depth;
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} while (delta > 0);
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}
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ep->rep_attr.cap.max_send_wr *= depth;
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if (ep->rep_attr.cap.max_send_wr > attrs->max_qp_wr) {
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cdata->max_requests = attrs->max_qp_wr / depth;
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if (!cdata->max_requests)
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return -EINVAL;
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ep->rep_attr.cap.max_send_wr = cdata->max_requests *
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depth;
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}
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ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
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ia->ri_max_frwr_depth);
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return 0;
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}
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/* FRWR mode conveys a list of pages per chunk segment. The
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* maximum length of that list is the FRWR page list depth.
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*/
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static size_t
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frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
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{
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
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RPCRDMA_MAX_HDR_SEGS * ia->ri_max_frwr_depth);
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}
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static void
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__frwr_sendcompletion_flush(struct ib_wc *wc, const char *wr)
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{
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if (wc->status != IB_WC_WR_FLUSH_ERR)
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pr_err("rpcrdma: %s: %s (%u/0x%x)\n",
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wr, ib_wc_status_msg(wc->status),
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wc->status, wc->vendor_err);
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}
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/**
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* frwr_wc_fastreg - Invoked by RDMA provider for a flushed FastReg WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_frwr *frwr =
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container_of(cqe, struct rpcrdma_frwr, fr_cqe);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS) {
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frwr->fr_state = FRWR_FLUSHED_FR;
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__frwr_sendcompletion_flush(wc, "fastreg");
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}
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trace_xprtrdma_wc_fastreg(wc, frwr);
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}
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/**
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* frwr_wc_localinv - Invoked by RDMA provider for a flushed LocalInv WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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*/
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static void
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frwr_wc_localinv(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_frwr *frwr = container_of(cqe, struct rpcrdma_frwr,
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fr_cqe);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS) {
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frwr->fr_state = FRWR_FLUSHED_LI;
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__frwr_sendcompletion_flush(wc, "localinv");
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}
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trace_xprtrdma_wc_li(wc, frwr);
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}
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/**
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* frwr_wc_localinv_wake - Invoked by RDMA provider for a signaled LocalInv WC
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* @cq: completion queue (ignored)
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* @wc: completed WR
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*
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* Awaken anyone waiting for an MR to finish being fenced.
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*/
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static void
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frwr_wc_localinv_wake(struct ib_cq *cq, struct ib_wc *wc)
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{
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struct ib_cqe *cqe = wc->wr_cqe;
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struct rpcrdma_frwr *frwr = container_of(cqe, struct rpcrdma_frwr,
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fr_cqe);
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/* WARNING: Only wr_cqe and status are reliable at this point */
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if (wc->status != IB_WC_SUCCESS) {
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frwr->fr_state = FRWR_FLUSHED_LI;
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__frwr_sendcompletion_flush(wc, "localinv");
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}
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complete(&frwr->fr_linv_done);
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trace_xprtrdma_wc_li_wake(wc, frwr);
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}
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/* Post a REG_MR Work Request to register a memory region
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* for remote access via RDMA READ or RDMA WRITE.
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*/
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static struct rpcrdma_mr_seg *
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frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
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int nsegs, bool writing, struct rpcrdma_mr **out)
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{
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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bool holes_ok = ia->ri_mrtype == IB_MR_TYPE_SG_GAPS;
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struct rpcrdma_frwr *frwr;
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struct rpcrdma_mr *mr;
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struct ib_mr *ibmr;
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struct ib_reg_wr *reg_wr;
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int i, n;
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u8 key;
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mr = NULL;
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do {
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if (mr)
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rpcrdma_mr_defer_recovery(mr);
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mr = rpcrdma_mr_get(r_xprt);
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if (!mr)
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return ERR_PTR(-EAGAIN);
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} while (mr->frwr.fr_state != FRWR_IS_INVALID);
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frwr = &mr->frwr;
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frwr->fr_state = FRWR_IS_VALID;
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if (nsegs > ia->ri_max_frwr_depth)
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nsegs = ia->ri_max_frwr_depth;
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for (i = 0; i < nsegs;) {
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if (seg->mr_page)
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sg_set_page(&mr->mr_sg[i],
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seg->mr_page,
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seg->mr_len,
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offset_in_page(seg->mr_offset));
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else
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sg_set_buf(&mr->mr_sg[i], seg->mr_offset,
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seg->mr_len);
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++seg;
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++i;
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if (holes_ok)
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continue;
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if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
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offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
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break;
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}
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mr->mr_dir = rpcrdma_data_dir(writing);
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mr->mr_nents = ib_dma_map_sg(ia->ri_device, mr->mr_sg, i, mr->mr_dir);
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if (!mr->mr_nents)
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goto out_dmamap_err;
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ibmr = frwr->fr_mr;
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n = ib_map_mr_sg(ibmr, mr->mr_sg, mr->mr_nents, NULL, PAGE_SIZE);
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if (unlikely(n != mr->mr_nents))
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goto out_mapmr_err;
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key = (u8)(ibmr->rkey & 0x000000FF);
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ib_update_fast_reg_key(ibmr, ++key);
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reg_wr = &frwr->fr_regwr;
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reg_wr->mr = ibmr;
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reg_wr->key = ibmr->rkey;
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reg_wr->access = writing ?
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IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
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IB_ACCESS_REMOTE_READ;
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mr->mr_handle = ibmr->rkey;
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mr->mr_length = ibmr->length;
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mr->mr_offset = ibmr->iova;
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*out = mr;
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return seg;
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out_dmamap_err:
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pr_err("rpcrdma: failed to DMA map sg %p sg_nents %d\n",
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mr->mr_sg, i);
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frwr->fr_state = FRWR_IS_INVALID;
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rpcrdma_mr_put(mr);
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return ERR_PTR(-EIO);
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out_mapmr_err:
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pr_err("rpcrdma: failed to map mr %p (%d/%d)\n",
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frwr->fr_mr, n, mr->mr_nents);
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rpcrdma_mr_defer_recovery(mr);
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return ERR_PTR(-EIO);
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}
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/* Post Send WR containing the RPC Call message.
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*
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* For FRMR, chain any FastReg WRs to the Send WR. Only a
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* single ib_post_send call is needed to register memory
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* and then post the Send WR.
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*/
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static int
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frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
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{
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struct ib_send_wr *post_wr, *bad_wr;
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struct rpcrdma_mr *mr;
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post_wr = &req->rl_sendctx->sc_wr;
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list_for_each_entry(mr, &req->rl_registered, mr_list) {
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struct rpcrdma_frwr *frwr;
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frwr = &mr->frwr;
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frwr->fr_cqe.done = frwr_wc_fastreg;
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frwr->fr_regwr.wr.next = post_wr;
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frwr->fr_regwr.wr.wr_cqe = &frwr->fr_cqe;
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frwr->fr_regwr.wr.num_sge = 0;
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frwr->fr_regwr.wr.opcode = IB_WR_REG_MR;
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frwr->fr_regwr.wr.send_flags = 0;
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post_wr = &frwr->fr_regwr.wr;
|
|
}
|
|
|
|
/* If ib_post_send fails, the next ->send_request for
|
|
* @req will queue these MWs for recovery.
|
|
*/
|
|
return ib_post_send(ia->ri_id->qp, post_wr, &bad_wr);
|
|
}
|
|
|
|
/* Handle a remotely invalidated mr on the @mrs list
|
|
*/
|
|
static void
|
|
frwr_op_reminv(struct rpcrdma_rep *rep, struct list_head *mrs)
|
|
{
|
|
struct rpcrdma_mr *mr;
|
|
|
|
list_for_each_entry(mr, mrs, mr_list)
|
|
if (mr->mr_handle == rep->rr_inv_rkey) {
|
|
list_del(&mr->mr_list);
|
|
trace_xprtrdma_remoteinv(mr);
|
|
mr->frwr.fr_state = FRWR_IS_INVALID;
|
|
rpcrdma_mr_unmap_and_put(mr);
|
|
break; /* only one invalidated MR per RPC */
|
|
}
|
|
}
|
|
|
|
/* Invalidate all memory regions that were registered for "req".
|
|
*
|
|
* Sleeps until it is safe for the host CPU to access the
|
|
* previously mapped memory regions.
|
|
*
|
|
* Caller ensures that @mrs is not empty before the call. This
|
|
* function empties the list.
|
|
*/
|
|
static void
|
|
frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mrs)
|
|
{
|
|
struct ib_send_wr *first, **prev, *last, *bad_wr;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
struct rpcrdma_frwr *frwr;
|
|
struct rpcrdma_mr *mr;
|
|
int count, rc;
|
|
|
|
/* ORDER: Invalidate all of the MRs first
|
|
*
|
|
* Chain the LOCAL_INV Work Requests and post them with
|
|
* a single ib_post_send() call.
|
|
*/
|
|
frwr = NULL;
|
|
count = 0;
|
|
prev = &first;
|
|
list_for_each_entry(mr, mrs, mr_list) {
|
|
mr->frwr.fr_state = FRWR_IS_INVALID;
|
|
|
|
frwr = &mr->frwr;
|
|
trace_xprtrdma_localinv(mr);
|
|
|
|
frwr->fr_cqe.done = frwr_wc_localinv;
|
|
last = &frwr->fr_invwr;
|
|
memset(last, 0, sizeof(*last));
|
|
last->wr_cqe = &frwr->fr_cqe;
|
|
last->opcode = IB_WR_LOCAL_INV;
|
|
last->ex.invalidate_rkey = mr->mr_handle;
|
|
count++;
|
|
|
|
*prev = last;
|
|
prev = &last->next;
|
|
}
|
|
if (!frwr)
|
|
goto unmap;
|
|
|
|
/* Strong send queue ordering guarantees that when the
|
|
* last WR in the chain completes, all WRs in the chain
|
|
* are complete.
|
|
*/
|
|
last->send_flags = IB_SEND_SIGNALED;
|
|
frwr->fr_cqe.done = frwr_wc_localinv_wake;
|
|
reinit_completion(&frwr->fr_linv_done);
|
|
|
|
/* Transport disconnect drains the receive CQ before it
|
|
* replaces the QP. The RPC reply handler won't call us
|
|
* unless ri_id->qp is a valid pointer.
|
|
*/
|
|
r_xprt->rx_stats.local_inv_needed++;
|
|
bad_wr = NULL;
|
|
rc = ib_post_send(ia->ri_id->qp, first, &bad_wr);
|
|
if (bad_wr != first)
|
|
wait_for_completion(&frwr->fr_linv_done);
|
|
if (rc)
|
|
goto reset_mrs;
|
|
|
|
/* ORDER: Now DMA unmap all of the MRs, and return
|
|
* them to the free MR list.
|
|
*/
|
|
unmap:
|
|
while (!list_empty(mrs)) {
|
|
mr = rpcrdma_mr_pop(mrs);
|
|
rpcrdma_mr_unmap_and_put(mr);
|
|
}
|
|
return;
|
|
|
|
reset_mrs:
|
|
pr_err("rpcrdma: FRWR invalidate ib_post_send returned %i\n", rc);
|
|
|
|
/* Find and reset the MRs in the LOCAL_INV WRs that did not
|
|
* get posted.
|
|
*/
|
|
while (bad_wr) {
|
|
frwr = container_of(bad_wr, struct rpcrdma_frwr,
|
|
fr_invwr);
|
|
mr = container_of(frwr, struct rpcrdma_mr, frwr);
|
|
|
|
__frwr_mr_reset(ia, mr);
|
|
|
|
bad_wr = bad_wr->next;
|
|
}
|
|
goto unmap;
|
|
}
|
|
|
|
const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
|
|
.ro_map = frwr_op_map,
|
|
.ro_send = frwr_op_send,
|
|
.ro_reminv = frwr_op_reminv,
|
|
.ro_unmap_sync = frwr_op_unmap_sync,
|
|
.ro_recover_mr = frwr_op_recover_mr,
|
|
.ro_open = frwr_op_open,
|
|
.ro_maxpages = frwr_op_maxpages,
|
|
.ro_init_mr = frwr_op_init_mr,
|
|
.ro_release_mr = frwr_op_release_mr,
|
|
.ro_displayname = "frwr",
|
|
.ro_send_w_inv_ok = RPCRDMA_CMP_F_SND_W_INV_OK,
|
|
};
|