669 lines
17 KiB
C
669 lines
17 KiB
C
/*
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* Copyright (c) 2015 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). Also referred to sometimes as FRMR mode.
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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 (frmr_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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* (frmr_op_unmap).
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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_mws 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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* three 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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* (Or, the LOCAL_INV WR has not completed or flushed yet).
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*
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* STALE: The MR was being registered or unregistered when the QP
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* entered ERROR state, and the pending WR was flushed.
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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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* When frwr_op_map encounters STALE and VALID MRs, they are recovered
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* with ib_dereg_mr and then are re-initialized. Beause 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_mws 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 "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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static struct workqueue_struct *frwr_recovery_wq;
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#define FRWR_RECOVERY_WQ_FLAGS (WQ_UNBOUND | WQ_MEM_RECLAIM)
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int
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frwr_alloc_recovery_wq(void)
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{
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frwr_recovery_wq = alloc_workqueue("frwr_recovery",
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FRWR_RECOVERY_WQ_FLAGS, 0);
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return !frwr_recovery_wq ? -ENOMEM : 0;
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}
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void
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frwr_destroy_recovery_wq(void)
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{
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struct workqueue_struct *wq;
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if (!frwr_recovery_wq)
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return;
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wq = frwr_recovery_wq;
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frwr_recovery_wq = NULL;
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destroy_workqueue(wq);
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}
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static int
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__frwr_reset_mr(struct rpcrdma_ia *ia, struct rpcrdma_mw *r)
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{
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struct rpcrdma_frmr *f = &r->frmr;
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int rc;
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rc = ib_dereg_mr(f->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, r);
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return rc;
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}
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f->fr_mr = ib_alloc_mr(ia->ri_pd, IB_MR_TYPE_MEM_REG,
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ia->ri_max_frmr_depth);
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if (IS_ERR(f->fr_mr)) {
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pr_warn("rpcrdma: ib_alloc_mr status %ld, frwr %p orphaned\n",
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PTR_ERR(f->fr_mr), r);
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return PTR_ERR(f->fr_mr);
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}
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dprintk("RPC: %s: recovered FRMR %p\n", __func__, r);
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f->fr_state = FRMR_IS_INVALID;
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return 0;
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}
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static void
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__frwr_reset_and_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
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{
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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struct rpcrdma_frmr *f = &mw->frmr;
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int rc;
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rc = __frwr_reset_mr(ia, mw);
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ib_dma_unmap_sg(ia->ri_device, f->fr_sg, f->fr_nents, f->fr_dir);
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if (rc)
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return;
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rpcrdma_put_mw(r_xprt, mw);
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}
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/* Deferred reset of a single FRMR. Generate a fresh rkey by
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* replacing the MR.
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*
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* There's no recovery if this fails. The FRMR is abandoned, but
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* remains in rb_all. It will be cleaned up when the transport is
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* destroyed.
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*/
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static void
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__frwr_recovery_worker(struct work_struct *work)
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{
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struct rpcrdma_mw *r = container_of(work, struct rpcrdma_mw,
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mw_work);
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__frwr_reset_and_unmap(r->mw_xprt, r);
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return;
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}
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/* A broken MR was discovered in a context that can't sleep.
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* Defer recovery to the recovery worker.
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*/
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static void
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__frwr_queue_recovery(struct rpcrdma_mw *r)
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{
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INIT_WORK(&r->mw_work, __frwr_recovery_worker);
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queue_work(frwr_recovery_wq, &r->mw_work);
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}
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static int
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__frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
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unsigned int depth)
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{
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struct rpcrdma_frmr *f = &r->frmr;
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int rc;
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f->fr_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, depth);
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if (IS_ERR(f->fr_mr))
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goto out_mr_err;
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f->fr_sg = kcalloc(depth, sizeof(*f->fr_sg), GFP_KERNEL);
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if (!f->fr_sg)
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goto out_list_err;
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sg_init_table(f->fr_sg, depth);
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init_completion(&f->fr_linv_done);
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return 0;
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out_mr_err:
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rc = PTR_ERR(f->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(f->fr_mr);
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return rc;
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}
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static void
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__frwr_release(struct rpcrdma_mw *r)
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{
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int rc;
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rc = ib_dereg_mr(r->frmr.fr_mr);
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if (rc)
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dprintk("RPC: %s: ib_dereg_mr status %i\n",
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__func__, rc);
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kfree(r->frmr.fr_sg);
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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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int depth, delta;
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ia->ri_max_frmr_depth =
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min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
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ia->ri_device->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_frmr_depth);
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/* Add room for frmr register and invalidate WRs.
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* 1. FRMR reg WR for head
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* 2. FRMR invalidate WR for head
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* 3. N FRMR reg WRs for pagelist
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* 4. N FRMR invalidate WRs for pagelist
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* 5. FRMR reg WR for tail
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* 6. FRMR 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 FRMR depth is smaller than
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* RPCRDMA_MAX_DATA_SEGS.
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*/
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if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) {
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delta = RPCRDMA_MAX_DATA_SEGS - ia->ri_max_frmr_depth;
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do {
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depth += 2; /* FRMR reg + invalidate */
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delta -= ia->ri_max_frmr_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 > ia->ri_device->attrs.max_qp_wr) {
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cdata->max_requests = ia->ri_device->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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rpcrdma_set_max_header_sizes(ia, cdata, max_t(unsigned int, 1,
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RPCRDMA_MAX_DATA_SEGS /
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ia->ri_max_frmr_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_frmr_depth);
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}
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static void
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__frwr_sendcompletion_flush(struct ib_wc *wc, struct rpcrdma_frmr *frmr,
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const char *wr)
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{
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frmr->fr_state = FRMR_IS_STALE;
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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 each polled 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 rpcrdma_frmr *frmr;
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struct ib_cqe *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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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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__frwr_sendcompletion_flush(wc, frmr, "fastreg");
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}
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}
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/**
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* frwr_wc_localinv - Invoked by RDMA provider for each polled 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 rpcrdma_frmr *frmr;
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struct ib_cqe *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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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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__frwr_sendcompletion_flush(wc, frmr, "localinv");
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}
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}
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/**
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* frwr_wc_localinv - Invoked by RDMA provider for each polled 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 rpcrdma_frmr *frmr;
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struct ib_cqe *cqe;
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/* WARNING: Only wr_cqe and status are reliable at this point */
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cqe = wc->wr_cqe;
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frmr = container_of(cqe, struct rpcrdma_frmr, fr_cqe);
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if (wc->status != IB_WC_SUCCESS)
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__frwr_sendcompletion_flush(wc, frmr, "localinv");
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complete_all(&frmr->fr_linv_done);
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}
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static int
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frwr_op_init(struct rpcrdma_xprt *r_xprt)
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{
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struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
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struct ib_device *device = r_xprt->rx_ia.ri_device;
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unsigned int depth = r_xprt->rx_ia.ri_max_frmr_depth;
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struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
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int i;
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spin_lock_init(&buf->rb_mwlock);
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INIT_LIST_HEAD(&buf->rb_mws);
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INIT_LIST_HEAD(&buf->rb_all);
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i = max_t(int, RPCRDMA_MAX_DATA_SEGS / depth, 1);
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i += 2; /* head + tail */
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i *= buf->rb_max_requests; /* one set for each RPC slot */
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dprintk("RPC: %s: initalizing %d FRMRs\n", __func__, i);
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while (i--) {
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struct rpcrdma_mw *r;
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int rc;
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r = kzalloc(sizeof(*r), GFP_KERNEL);
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if (!r)
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return -ENOMEM;
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rc = __frwr_init(r, pd, device, depth);
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if (rc) {
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kfree(r);
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return rc;
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}
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r->mw_xprt = r_xprt;
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list_add(&r->mw_list, &buf->rb_mws);
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list_add(&r->mw_all, &buf->rb_all);
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}
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return 0;
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}
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|
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/* Post a FAST_REG 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 int
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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)
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{
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struct rpcrdma_ia *ia = &r_xprt->rx_ia;
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struct ib_device *device = ia->ri_device;
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enum dma_data_direction direction = rpcrdma_data_dir(writing);
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struct rpcrdma_mr_seg *seg1 = seg;
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struct rpcrdma_mw *mw;
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struct rpcrdma_frmr *frmr;
|
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struct ib_mr *mr;
|
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struct ib_reg_wr *reg_wr;
|
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struct ib_send_wr *bad_wr;
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int rc, i, n, dma_nents;
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u8 key;
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|
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mw = seg1->rl_mw;
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seg1->rl_mw = NULL;
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do {
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if (mw)
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__frwr_queue_recovery(mw);
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mw = rpcrdma_get_mw(r_xprt);
|
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if (!mw)
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return -ENOMEM;
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} while (mw->frmr.fr_state != FRMR_IS_INVALID);
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frmr = &mw->frmr;
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frmr->fr_state = FRMR_IS_VALID;
|
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mr = frmr->fr_mr;
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reg_wr = &frmr->fr_regwr;
|
|
|
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if (nsegs > ia->ri_max_frmr_depth)
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nsegs = ia->ri_max_frmr_depth;
|
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|
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for (i = 0; i < nsegs;) {
|
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if (seg->mr_page)
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sg_set_page(&frmr->fr_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(&frmr->fr_sg[i], seg->mr_offset,
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seg->mr_len);
|
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|
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++seg;
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++i;
|
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|
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/* Check for holes */
|
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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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frmr->fr_nents = i;
|
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frmr->fr_dir = direction;
|
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|
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dma_nents = ib_dma_map_sg(device, frmr->fr_sg, frmr->fr_nents, direction);
|
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if (!dma_nents) {
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pr_err("RPC: %s: failed to dma map sg %p sg_nents %u\n",
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__func__, frmr->fr_sg, frmr->fr_nents);
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return -ENOMEM;
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}
|
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|
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n = ib_map_mr_sg(mr, frmr->fr_sg, frmr->fr_nents, NULL, PAGE_SIZE);
|
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if (unlikely(n != frmr->fr_nents)) {
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pr_err("RPC: %s: failed to map mr %p (%u/%u)\n",
|
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__func__, frmr->fr_mr, n, frmr->fr_nents);
|
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rc = n < 0 ? n : -EINVAL;
|
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goto out_senderr;
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}
|
|
|
|
dprintk("RPC: %s: Using frmr %p to map %u segments (%u bytes)\n",
|
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__func__, mw, frmr->fr_nents, mr->length);
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|
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key = (u8)(mr->rkey & 0x000000FF);
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ib_update_fast_reg_key(mr, ++key);
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|
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reg_wr->wr.next = NULL;
|
|
reg_wr->wr.opcode = IB_WR_REG_MR;
|
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frmr->fr_cqe.done = frwr_wc_fastreg;
|
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reg_wr->wr.wr_cqe = &frmr->fr_cqe;
|
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reg_wr->wr.num_sge = 0;
|
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reg_wr->wr.send_flags = 0;
|
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reg_wr->mr = mr;
|
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reg_wr->key = mr->rkey;
|
|
reg_wr->access = writing ?
|
|
IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
|
|
IB_ACCESS_REMOTE_READ;
|
|
|
|
DECR_CQCOUNT(&r_xprt->rx_ep);
|
|
rc = ib_post_send(ia->ri_id->qp, ®_wr->wr, &bad_wr);
|
|
if (rc)
|
|
goto out_senderr;
|
|
|
|
seg1->rl_mw = mw;
|
|
seg1->mr_rkey = mr->rkey;
|
|
seg1->mr_base = mr->iova;
|
|
seg1->mr_nsegs = frmr->fr_nents;
|
|
seg1->mr_len = mr->length;
|
|
|
|
return frmr->fr_nents;
|
|
|
|
out_senderr:
|
|
dprintk("RPC: %s: ib_post_send status %i\n", __func__, rc);
|
|
__frwr_queue_recovery(mw);
|
|
return rc;
|
|
}
|
|
|
|
static struct ib_send_wr *
|
|
__frwr_prepare_linv_wr(struct rpcrdma_mr_seg *seg)
|
|
{
|
|
struct rpcrdma_mw *mw = seg->rl_mw;
|
|
struct rpcrdma_frmr *f = &mw->frmr;
|
|
struct ib_send_wr *invalidate_wr;
|
|
|
|
f->fr_state = FRMR_IS_INVALID;
|
|
invalidate_wr = &f->fr_invwr;
|
|
|
|
memset(invalidate_wr, 0, sizeof(*invalidate_wr));
|
|
f->fr_cqe.done = frwr_wc_localinv;
|
|
invalidate_wr->wr_cqe = &f->fr_cqe;
|
|
invalidate_wr->opcode = IB_WR_LOCAL_INV;
|
|
invalidate_wr->ex.invalidate_rkey = f->fr_mr->rkey;
|
|
|
|
return invalidate_wr;
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
static void
|
|
frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
|
|
{
|
|
struct ib_send_wr *invalidate_wrs, *pos, *prev, *bad_wr;
|
|
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
|
|
struct rpcrdma_mr_seg *seg;
|
|
unsigned int i, nchunks;
|
|
struct rpcrdma_frmr *f;
|
|
struct rpcrdma_mw *mw;
|
|
int rc;
|
|
|
|
dprintk("RPC: %s: req %p\n", __func__, req);
|
|
|
|
/* ORDER: Invalidate all of the req's MRs first
|
|
*
|
|
* Chain the LOCAL_INV Work Requests and post them with
|
|
* a single ib_post_send() call.
|
|
*/
|
|
invalidate_wrs = pos = prev = NULL;
|
|
seg = NULL;
|
|
for (i = 0, nchunks = req->rl_nchunks; nchunks; nchunks--) {
|
|
seg = &req->rl_segments[i];
|
|
|
|
pos = __frwr_prepare_linv_wr(seg);
|
|
|
|
if (!invalidate_wrs)
|
|
invalidate_wrs = pos;
|
|
else
|
|
prev->next = pos;
|
|
prev = pos;
|
|
|
|
i += seg->mr_nsegs;
|
|
}
|
|
f = &seg->rl_mw->frmr;
|
|
|
|
/* Strong send queue ordering guarantees that when the
|
|
* last WR in the chain completes, all WRs in the chain
|
|
* are complete.
|
|
*/
|
|
f->fr_invwr.send_flags = IB_SEND_SIGNALED;
|
|
f->fr_cqe.done = frwr_wc_localinv_wake;
|
|
reinit_completion(&f->fr_linv_done);
|
|
INIT_CQCOUNT(&r_xprt->rx_ep);
|
|
|
|
/* 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.
|
|
*/
|
|
rc = ib_post_send(ia->ri_id->qp, invalidate_wrs, &bad_wr);
|
|
if (rc)
|
|
goto reset_mrs;
|
|
|
|
wait_for_completion(&f->fr_linv_done);
|
|
|
|
/* ORDER: Now DMA unmap all of the req's MRs, and return
|
|
* them to the free MW list.
|
|
*/
|
|
unmap:
|
|
for (i = 0, nchunks = req->rl_nchunks; nchunks; nchunks--) {
|
|
seg = &req->rl_segments[i];
|
|
mw = seg->rl_mw;
|
|
seg->rl_mw = NULL;
|
|
|
|
ib_dma_unmap_sg(ia->ri_device, f->fr_sg, f->fr_nents,
|
|
f->fr_dir);
|
|
rpcrdma_put_mw(r_xprt, mw);
|
|
|
|
i += seg->mr_nsegs;
|
|
seg->mr_nsegs = 0;
|
|
}
|
|
|
|
req->rl_nchunks = 0;
|
|
return;
|
|
|
|
reset_mrs:
|
|
pr_warn("%s: ib_post_send failed %i\n", __func__, rc);
|
|
|
|
/* Find and reset the MRs in the LOCAL_INV WRs that did not
|
|
* get posted. This is synchronous, and slow.
|
|
*/
|
|
for (i = 0, nchunks = req->rl_nchunks; nchunks; nchunks--) {
|
|
seg = &req->rl_segments[i];
|
|
mw = seg->rl_mw;
|
|
f = &mw->frmr;
|
|
|
|
if (mw->frmr.fr_mr->rkey == bad_wr->ex.invalidate_rkey) {
|
|
__frwr_reset_mr(ia, mw);
|
|
bad_wr = bad_wr->next;
|
|
}
|
|
|
|
i += seg->mr_nsegs;
|
|
}
|
|
goto unmap;
|
|
}
|
|
|
|
/* Use a slow, safe mechanism to invalidate all memory regions
|
|
* that were registered for "req".
|
|
*/
|
|
static void
|
|
frwr_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
|
|
bool sync)
|
|
{
|
|
struct rpcrdma_mr_seg *seg;
|
|
struct rpcrdma_mw *mw;
|
|
unsigned int i;
|
|
|
|
for (i = 0; req->rl_nchunks; req->rl_nchunks--) {
|
|
seg = &req->rl_segments[i];
|
|
mw = seg->rl_mw;
|
|
|
|
if (sync)
|
|
__frwr_reset_and_unmap(r_xprt, mw);
|
|
else
|
|
__frwr_queue_recovery(mw);
|
|
|
|
i += seg->mr_nsegs;
|
|
seg->mr_nsegs = 0;
|
|
seg->rl_mw = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
frwr_op_destroy(struct rpcrdma_buffer *buf)
|
|
{
|
|
struct rpcrdma_mw *r;
|
|
|
|
/* Ensure stale MWs for "buf" are no longer in flight */
|
|
flush_workqueue(frwr_recovery_wq);
|
|
|
|
while (!list_empty(&buf->rb_all)) {
|
|
r = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all);
|
|
list_del(&r->mw_all);
|
|
__frwr_release(r);
|
|
kfree(r);
|
|
}
|
|
}
|
|
|
|
const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops = {
|
|
.ro_map = frwr_op_map,
|
|
.ro_unmap_sync = frwr_op_unmap_sync,
|
|
.ro_unmap_safe = frwr_op_unmap_safe,
|
|
.ro_open = frwr_op_open,
|
|
.ro_maxpages = frwr_op_maxpages,
|
|
.ro_init = frwr_op_init,
|
|
.ro_destroy = frwr_op_destroy,
|
|
.ro_displayname = "frwr",
|
|
};
|