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700 lines
19 KiB
700 lines
19 KiB
// 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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|
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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 invalidation |
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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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|
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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_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_unmap_async and frwr_unmap_sync). |
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* |
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* Typically FAST_REG Work Requests are not signaled, and neither are |
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* RDMA Send Work Requests (with the exception of signaling occasionally |
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* to prevent provider work queue overflows). This greatly reduces HCA |
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* interrupt workload. |
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*/ |
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|
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/* Transport recovery |
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* |
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* frwr_map and frwr_unmap_* cannot run at the same time the transport |
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* connect worker is running. The connect worker holds the transport |
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* send lock, just as ->send_request does. This prevents frwr_map and |
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* the connect worker from running concurrently. When a connection is |
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* closed, the Receive completion queue is drained before the allowing |
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* the connect worker to get control. This prevents frwr_unmap and the |
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* connect worker from running concurrently. |
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* |
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* When the underlying transport disconnects, MRs that are in flight |
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* are flushed and are likely unusable. Thus all MRs are destroyed. |
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* New MRs are created on demand. |
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*/ |
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|
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#include <linux/sunrpc/svc_rdma.h> |
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|
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#include "xprt_rdma.h" |
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#include <trace/events/rpcrdma.h> |
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|
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static void frwr_cid_init(struct rpcrdma_ep *ep, |
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struct rpcrdma_mr *mr) |
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{ |
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struct rpc_rdma_cid *cid = &mr->mr_cid; |
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cid->ci_queue_id = ep->re_attr.send_cq->res.id; |
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cid->ci_completion_id = mr->mr_ibmr->res.id; |
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} |
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static void frwr_mr_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr) |
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{ |
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if (mr->mr_device) { |
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trace_xprtrdma_mr_unmap(mr); |
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ib_dma_unmap_sg(mr->mr_device, mr->mr_sg, mr->mr_nents, |
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mr->mr_dir); |
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mr->mr_device = NULL; |
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} |
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} |
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/** |
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* frwr_mr_release - Destroy one MR |
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* @mr: MR allocated by frwr_mr_init |
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* |
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*/ |
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void frwr_mr_release(struct rpcrdma_mr *mr) |
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{ |
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int rc; |
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frwr_mr_unmap(mr->mr_xprt, mr); |
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rc = ib_dereg_mr(mr->mr_ibmr); |
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if (rc) |
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trace_xprtrdma_frwr_dereg(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 void frwr_mr_put(struct rpcrdma_mr *mr) |
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{ |
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frwr_mr_unmap(mr->mr_xprt, mr); |
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|
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/* The MR is returned to the req's MR free list instead |
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* of to the xprt's MR free list. No spinlock is needed. |
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*/ |
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rpcrdma_mr_push(mr, &mr->mr_req->rl_free_mrs); |
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} |
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/* frwr_reset - Place MRs back on the free list |
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* @req: request to reset |
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* |
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* Used after a failed marshal. For FRWR, this means the MRs |
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* don't have to be fully released and recreated. |
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* |
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* NB: This is safe only as long as none of @req's MRs are |
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* involved with an ongoing asynchronous FAST_REG or LOCAL_INV |
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* Work Request. |
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*/ |
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void frwr_reset(struct rpcrdma_req *req) |
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{ |
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struct rpcrdma_mr *mr; |
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|
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while ((mr = rpcrdma_mr_pop(&req->rl_registered))) |
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frwr_mr_put(mr); |
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} |
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/** |
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* frwr_mr_init - Initialize one MR |
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* @r_xprt: controlling transport instance |
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* @mr: generic MR to prepare for FRWR |
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* |
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* Returns zero if successful. Otherwise a negative errno |
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* is returned. |
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*/ |
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int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr) |
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{ |
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struct rpcrdma_ep *ep = r_xprt->rx_ep; |
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unsigned int depth = ep->re_max_fr_depth; |
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struct scatterlist *sg; |
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struct ib_mr *frmr; |
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int rc; |
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frmr = ib_alloc_mr(ep->re_pd, ep->re_mrtype, depth); |
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if (IS_ERR(frmr)) |
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goto out_mr_err; |
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sg = kmalloc_array(depth, sizeof(*sg), GFP_NOFS); |
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if (!sg) |
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goto out_list_err; |
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mr->mr_xprt = r_xprt; |
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mr->mr_ibmr = frmr; |
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mr->mr_device = NULL; |
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INIT_LIST_HEAD(&mr->mr_list); |
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init_completion(&mr->mr_linv_done); |
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frwr_cid_init(ep, mr); |
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sg_init_table(sg, depth); |
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mr->mr_sg = sg; |
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return 0; |
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out_mr_err: |
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rc = PTR_ERR(frmr); |
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trace_xprtrdma_frwr_alloc(mr, rc); |
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return rc; |
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out_list_err: |
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ib_dereg_mr(frmr); |
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return -ENOMEM; |
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} |
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/** |
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* frwr_query_device - Prepare a transport for use with FRWR |
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* @ep: endpoint to fill in |
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* @device: RDMA device to query |
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* |
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* On success, sets: |
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* ep->re_attr |
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* ep->re_max_requests |
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* ep->re_max_rdma_segs |
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* ep->re_max_fr_depth |
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* ep->re_mrtype |
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* |
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* Return values: |
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* On success, returns zero. |
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* %-EINVAL - the device does not support FRWR memory registration |
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* %-ENOMEM - the device is not sufficiently capable for NFS/RDMA |
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*/ |
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int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device) |
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{ |
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const struct ib_device_attr *attrs = &device->attrs; |
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int max_qp_wr, depth, delta; |
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unsigned int max_sge; |
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if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) || |
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attrs->max_fast_reg_page_list_len == 0) { |
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pr_err("rpcrdma: 'frwr' mode is not supported by device %s\n", |
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device->name); |
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return -EINVAL; |
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} |
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max_sge = min_t(unsigned int, attrs->max_send_sge, |
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RPCRDMA_MAX_SEND_SGES); |
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if (max_sge < RPCRDMA_MIN_SEND_SGES) { |
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pr_err("rpcrdma: HCA provides only %u send SGEs\n", max_sge); |
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return -ENOMEM; |
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} |
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ep->re_attr.cap.max_send_sge = max_sge; |
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ep->re_attr.cap.max_recv_sge = 1; |
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ep->re_mrtype = IB_MR_TYPE_MEM_REG; |
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if (attrs->device_cap_flags & IB_DEVICE_SG_GAPS_REG) |
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ep->re_mrtype = IB_MR_TYPE_SG_GAPS; |
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/* Quirk: Some devices advertise a large max_fast_reg_page_list_len |
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* capability, but perform optimally when the MRs are not larger |
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* than a page. |
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*/ |
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if (attrs->max_sge_rd > RPCRDMA_MAX_HDR_SEGS) |
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ep->re_max_fr_depth = attrs->max_sge_rd; |
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else |
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ep->re_max_fr_depth = attrs->max_fast_reg_page_list_len; |
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if (ep->re_max_fr_depth > RPCRDMA_MAX_DATA_SEGS) |
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ep->re_max_fr_depth = RPCRDMA_MAX_DATA_SEGS; |
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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 (ep->re_max_fr_depth < RPCRDMA_MAX_DATA_SEGS) { |
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delta = RPCRDMA_MAX_DATA_SEGS - ep->re_max_fr_depth; |
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do { |
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depth += 2; /* FRWR reg + invalidate */ |
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delta -= ep->re_max_fr_depth; |
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} while (delta > 0); |
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} |
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max_qp_wr = attrs->max_qp_wr; |
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max_qp_wr -= RPCRDMA_BACKWARD_WRS; |
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max_qp_wr -= 1; |
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if (max_qp_wr < RPCRDMA_MIN_SLOT_TABLE) |
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return -ENOMEM; |
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if (ep->re_max_requests > max_qp_wr) |
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ep->re_max_requests = max_qp_wr; |
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ep->re_attr.cap.max_send_wr = ep->re_max_requests * depth; |
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if (ep->re_attr.cap.max_send_wr > max_qp_wr) { |
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ep->re_max_requests = max_qp_wr / depth; |
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if (!ep->re_max_requests) |
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return -ENOMEM; |
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ep->re_attr.cap.max_send_wr = ep->re_max_requests * depth; |
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} |
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ep->re_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS; |
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ep->re_attr.cap.max_send_wr += 1; /* for ib_drain_sq */ |
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ep->re_attr.cap.max_recv_wr = ep->re_max_requests; |
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ep->re_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS; |
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ep->re_attr.cap.max_recv_wr += RPCRDMA_MAX_RECV_BATCH; |
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ep->re_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */ |
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ep->re_max_rdma_segs = |
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DIV_ROUND_UP(RPCRDMA_MAX_DATA_SEGS, ep->re_max_fr_depth); |
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/* Reply chunks require segments for head and tail buffers */ |
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ep->re_max_rdma_segs += 2; |
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if (ep->re_max_rdma_segs > RPCRDMA_MAX_HDR_SEGS) |
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ep->re_max_rdma_segs = RPCRDMA_MAX_HDR_SEGS; |
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/* Ensure the underlying device is capable of conveying the |
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* largest r/wsize NFS will ask for. This guarantees that |
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* failing over from one RDMA device to another will not |
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* break NFS I/O. |
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*/ |
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if ((ep->re_max_rdma_segs * ep->re_max_fr_depth) < RPCRDMA_MAX_SEGS) |
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return -ENOMEM; |
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return 0; |
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} |
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/** |
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* frwr_map - Register a memory region |
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* @r_xprt: controlling transport |
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* @seg: memory region co-ordinates |
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* @nsegs: number of segments remaining |
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* @writing: true when RDMA Write will be used |
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* @xid: XID of RPC using the registered memory |
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* @mr: MR to fill in |
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* |
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* Prepare 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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* Returns the next segment or a negative errno pointer. |
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* On success, @mr is filled in. |
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*/ |
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struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt, |
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struct rpcrdma_mr_seg *seg, |
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int nsegs, bool writing, __be32 xid, |
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struct rpcrdma_mr *mr) |
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{ |
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struct rpcrdma_ep *ep = r_xprt->rx_ep; |
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struct ib_reg_wr *reg_wr; |
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int i, n, dma_nents; |
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struct ib_mr *ibmr; |
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u8 key; |
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if (nsegs > ep->re_max_fr_depth) |
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nsegs = ep->re_max_fr_depth; |
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for (i = 0; i < nsegs;) { |
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sg_set_page(&mr->mr_sg[i], seg->mr_page, |
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seg->mr_len, seg->mr_offset); |
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++seg; |
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++i; |
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if (ep->re_mrtype == IB_MR_TYPE_SG_GAPS) |
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continue; |
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if ((i < nsegs && 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 = i; |
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dma_nents = ib_dma_map_sg(ep->re_id->device, mr->mr_sg, mr->mr_nents, |
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mr->mr_dir); |
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if (!dma_nents) |
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goto out_dmamap_err; |
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mr->mr_device = ep->re_id->device; |
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ibmr = mr->mr_ibmr; |
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n = ib_map_mr_sg(ibmr, mr->mr_sg, dma_nents, NULL, PAGE_SIZE); |
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if (n != dma_nents) |
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goto out_mapmr_err; |
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ibmr->iova &= 0x00000000ffffffff; |
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ibmr->iova |= ((u64)be32_to_cpu(xid)) << 32; |
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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 = &mr->mr_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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trace_xprtrdma_mr_map(mr); |
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return seg; |
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out_dmamap_err: |
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trace_xprtrdma_frwr_sgerr(mr, i); |
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return ERR_PTR(-EIO); |
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out_mapmr_err: |
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trace_xprtrdma_frwr_maperr(mr, n); |
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return ERR_PTR(-EIO); |
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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 |
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* @wc: WCE for a completed FastReg WR |
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* |
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* Each flushed MR gets destroyed after the QP has drained. |
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*/ |
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static void 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_mr *mr = container_of(cqe, struct rpcrdma_mr, mr_cqe); |
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/* WARNING: Only wr_cqe and status are reliable at this point */ |
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trace_xprtrdma_wc_fastreg(wc, &mr->mr_cid); |
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rpcrdma_flush_disconnect(cq->cq_context, wc); |
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} |
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/** |
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* frwr_send - post Send WRs containing the RPC Call message |
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* @r_xprt: controlling transport instance |
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* @req: prepared RPC Call |
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* |
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* For FRWR, 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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* Returns the return code from ib_post_send. |
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* |
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* Caller must hold the transport send lock to ensure that the |
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* pointers to the transport's rdma_cm_id and QP are stable. |
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*/ |
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int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) |
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{ |
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struct ib_send_wr *post_wr, *send_wr = &req->rl_wr; |
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struct rpcrdma_ep *ep = r_xprt->rx_ep; |
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struct rpcrdma_mr *mr; |
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unsigned int num_wrs; |
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int ret; |
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num_wrs = 1; |
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post_wr = send_wr; |
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list_for_each_entry(mr, &req->rl_registered, mr_list) { |
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trace_xprtrdma_mr_fastreg(mr); |
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mr->mr_cqe.done = frwr_wc_fastreg; |
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mr->mr_regwr.wr.next = post_wr; |
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mr->mr_regwr.wr.wr_cqe = &mr->mr_cqe; |
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mr->mr_regwr.wr.num_sge = 0; |
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mr->mr_regwr.wr.opcode = IB_WR_REG_MR; |
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mr->mr_regwr.wr.send_flags = 0; |
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post_wr = &mr->mr_regwr.wr; |
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++num_wrs; |
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} |
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if ((kref_read(&req->rl_kref) > 1) || num_wrs > ep->re_send_count) { |
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send_wr->send_flags |= IB_SEND_SIGNALED; |
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ep->re_send_count = min_t(unsigned int, ep->re_send_batch, |
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num_wrs - ep->re_send_count); |
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} else { |
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send_wr->send_flags &= ~IB_SEND_SIGNALED; |
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ep->re_send_count -= num_wrs; |
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} |
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trace_xprtrdma_post_send(req); |
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ret = ib_post_send(ep->re_id->qp, post_wr, NULL); |
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if (ret) |
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trace_xprtrdma_post_send_err(r_xprt, req, ret); |
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return ret; |
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} |
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/** |
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* frwr_reminv - handle a remotely invalidated mr on the @mrs list |
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* @rep: Received reply |
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* @mrs: list of MRs to check |
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* |
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*/ |
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void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs) |
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{ |
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struct rpcrdma_mr *mr; |
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|
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list_for_each_entry(mr, mrs, mr_list) |
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if (mr->mr_handle == rep->rr_inv_rkey) { |
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list_del_init(&mr->mr_list); |
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trace_xprtrdma_mr_reminv(mr); |
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frwr_mr_put(mr); |
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break; /* only one invalidated MR per RPC */ |
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} |
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} |
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static void frwr_mr_done(struct ib_wc *wc, struct rpcrdma_mr *mr) |
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{ |
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if (likely(wc->status == IB_WC_SUCCESS)) |
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frwr_mr_put(mr); |
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} |
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|
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/** |
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* frwr_wc_localinv - Invoked by RDMA provider for a LOCAL_INV WC |
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* @cq: completion queue |
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* @wc: WCE for a completed LocalInv WR |
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* |
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*/ |
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static void 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_mr *mr = container_of(cqe, struct rpcrdma_mr, mr_cqe); |
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|
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/* WARNING: Only wr_cqe and status are reliable at this point */ |
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trace_xprtrdma_wc_li(wc, &mr->mr_cid); |
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frwr_mr_done(wc, mr); |
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|
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rpcrdma_flush_disconnect(cq->cq_context, wc); |
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} |
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|
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/** |
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* frwr_wc_localinv_wake - Invoked by RDMA provider for a LOCAL_INV WC |
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* @cq: completion queue |
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* @wc: WCE for a completed LocalInv 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 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_mr *mr = container_of(cqe, struct rpcrdma_mr, mr_cqe); |
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/* WARNING: Only wr_cqe and status are reliable at this point */ |
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trace_xprtrdma_wc_li_wake(wc, &mr->mr_cid); |
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frwr_mr_done(wc, mr); |
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complete(&mr->mr_linv_done); |
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|
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rpcrdma_flush_disconnect(cq->cq_context, wc); |
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} |
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|
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/** |
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* frwr_unmap_sync - invalidate memory regions that were registered for @req |
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* @r_xprt: controlling transport instance |
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* @req: rpcrdma_req with a non-empty list of MRs to process |
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* |
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* Sleeps until it is safe for the host CPU to access the previously mapped |
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* memory regions. This guarantees that registered MRs are properly fenced |
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* from the server before the RPC consumer accesses the data in them. It |
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* also ensures proper Send flow control: waking the next RPC waits until |
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* this RPC has relinquished all its Send Queue entries. |
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*/ |
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void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) |
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{ |
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struct ib_send_wr *first, **prev, *last; |
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struct rpcrdma_ep *ep = r_xprt->rx_ep; |
|
const struct ib_send_wr *bad_wr; |
|
struct rpcrdma_mr *mr; |
|
int rc; |
|
|
|
/* ORDER: Invalidate all of the MRs first |
|
* |
|
* Chain the LOCAL_INV Work Requests and post them with |
|
* a single ib_post_send() call. |
|
*/ |
|
prev = &first; |
|
mr = rpcrdma_mr_pop(&req->rl_registered); |
|
do { |
|
trace_xprtrdma_mr_localinv(mr); |
|
r_xprt->rx_stats.local_inv_needed++; |
|
|
|
last = &mr->mr_invwr; |
|
last->next = NULL; |
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last->wr_cqe = &mr->mr_cqe; |
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last->sg_list = NULL; |
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last->num_sge = 0; |
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last->opcode = IB_WR_LOCAL_INV; |
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last->send_flags = IB_SEND_SIGNALED; |
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last->ex.invalidate_rkey = mr->mr_handle; |
|
|
|
last->wr_cqe->done = frwr_wc_localinv; |
|
|
|
*prev = last; |
|
prev = &last->next; |
|
} while ((mr = rpcrdma_mr_pop(&req->rl_registered))); |
|
|
|
mr = container_of(last, struct rpcrdma_mr, mr_invwr); |
|
|
|
/* Strong send queue ordering guarantees that when the |
|
* last WR in the chain completes, all WRs in the chain |
|
* are complete. |
|
*/ |
|
last->wr_cqe->done = frwr_wc_localinv_wake; |
|
reinit_completion(&mr->mr_linv_done); |
|
|
|
/* Transport disconnect drains the receive CQ before it |
|
* replaces the QP. The RPC reply handler won't call us |
|
* unless re_id->qp is a valid pointer. |
|
*/ |
|
bad_wr = NULL; |
|
rc = ib_post_send(ep->re_id->qp, first, &bad_wr); |
|
|
|
/* The final LOCAL_INV WR in the chain is supposed to |
|
* do the wake. If it was never posted, the wake will |
|
* not happen, so don't wait in that case. |
|
*/ |
|
if (bad_wr != first) |
|
wait_for_completion(&mr->mr_linv_done); |
|
if (!rc) |
|
return; |
|
|
|
/* On error, the MRs get destroyed once the QP has drained. */ |
|
trace_xprtrdma_post_linv_err(req, rc); |
|
|
|
/* Force a connection loss to ensure complete recovery. |
|
*/ |
|
rpcrdma_force_disconnect(ep); |
|
} |
|
|
|
/** |
|
* frwr_wc_localinv_done - Invoked by RDMA provider for a signaled LOCAL_INV WC |
|
* @cq: completion queue |
|
* @wc: WCE for a completed LocalInv WR |
|
* |
|
*/ |
|
static void frwr_wc_localinv_done(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct ib_cqe *cqe = wc->wr_cqe; |
|
struct rpcrdma_mr *mr = container_of(cqe, struct rpcrdma_mr, mr_cqe); |
|
struct rpcrdma_rep *rep; |
|
|
|
/* WARNING: Only wr_cqe and status are reliable at this point */ |
|
trace_xprtrdma_wc_li_done(wc, &mr->mr_cid); |
|
|
|
/* Ensure that @rep is generated before the MR is released */ |
|
rep = mr->mr_req->rl_reply; |
|
smp_rmb(); |
|
|
|
if (wc->status != IB_WC_SUCCESS) { |
|
if (rep) |
|
rpcrdma_unpin_rqst(rep); |
|
rpcrdma_flush_disconnect(cq->cq_context, wc); |
|
return; |
|
} |
|
frwr_mr_put(mr); |
|
rpcrdma_complete_rqst(rep); |
|
} |
|
|
|
/** |
|
* frwr_unmap_async - invalidate memory regions that were registered for @req |
|
* @r_xprt: controlling transport instance |
|
* @req: rpcrdma_req with a non-empty list of MRs to process |
|
* |
|
* This guarantees that registered MRs are properly fenced from the |
|
* server before the RPC consumer accesses the data in them. It also |
|
* ensures proper Send flow control: waking the next RPC waits until |
|
* this RPC has relinquished all its Send Queue entries. |
|
*/ |
|
void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) |
|
{ |
|
struct ib_send_wr *first, *last, **prev; |
|
struct rpcrdma_ep *ep = r_xprt->rx_ep; |
|
struct rpcrdma_mr *mr; |
|
int rc; |
|
|
|
/* Chain the LOCAL_INV Work Requests and post them with |
|
* a single ib_post_send() call. |
|
*/ |
|
prev = &first; |
|
mr = rpcrdma_mr_pop(&req->rl_registered); |
|
do { |
|
trace_xprtrdma_mr_localinv(mr); |
|
r_xprt->rx_stats.local_inv_needed++; |
|
|
|
last = &mr->mr_invwr; |
|
last->next = NULL; |
|
last->wr_cqe = &mr->mr_cqe; |
|
last->sg_list = NULL; |
|
last->num_sge = 0; |
|
last->opcode = IB_WR_LOCAL_INV; |
|
last->send_flags = IB_SEND_SIGNALED; |
|
last->ex.invalidate_rkey = mr->mr_handle; |
|
|
|
last->wr_cqe->done = frwr_wc_localinv; |
|
|
|
*prev = last; |
|
prev = &last->next; |
|
} while ((mr = rpcrdma_mr_pop(&req->rl_registered))); |
|
|
|
/* Strong send queue ordering guarantees that when the |
|
* last WR in the chain completes, all WRs in the chain |
|
* are complete. The last completion will wake up the |
|
* RPC waiter. |
|
*/ |
|
last->wr_cqe->done = frwr_wc_localinv_done; |
|
|
|
/* Transport disconnect drains the receive CQ before it |
|
* replaces the QP. The RPC reply handler won't call us |
|
* unless re_id->qp is a valid pointer. |
|
*/ |
|
rc = ib_post_send(ep->re_id->qp, first, NULL); |
|
if (!rc) |
|
return; |
|
|
|
/* On error, the MRs get destroyed once the QP has drained. */ |
|
trace_xprtrdma_post_linv_err(req, rc); |
|
|
|
/* The final LOCAL_INV WR in the chain is supposed to |
|
* do the wake. If it was never posted, the wake does |
|
* not happen. Unpin the rqst in preparation for its |
|
* retransmission. |
|
*/ |
|
rpcrdma_unpin_rqst(req->rl_reply); |
|
|
|
/* Force a connection loss to ensure complete recovery. |
|
*/ |
|
rpcrdma_force_disconnect(ep); |
|
} |
|
|
|
/** |
|
* frwr_wp_create - Create an MR for padding Write chunks |
|
* @r_xprt: transport resources to use |
|
* |
|
* Return 0 on success, negative errno on failure. |
|
*/ |
|
int frwr_wp_create(struct rpcrdma_xprt *r_xprt) |
|
{ |
|
struct rpcrdma_ep *ep = r_xprt->rx_ep; |
|
struct rpcrdma_mr_seg seg; |
|
struct rpcrdma_mr *mr; |
|
|
|
mr = rpcrdma_mr_get(r_xprt); |
|
if (!mr) |
|
return -EAGAIN; |
|
mr->mr_req = NULL; |
|
ep->re_write_pad_mr = mr; |
|
|
|
seg.mr_len = XDR_UNIT; |
|
seg.mr_page = virt_to_page(ep->re_write_pad); |
|
seg.mr_offset = offset_in_page(ep->re_write_pad); |
|
if (IS_ERR(frwr_map(r_xprt, &seg, 1, true, xdr_zero, mr))) |
|
return -EIO; |
|
trace_xprtrdma_mr_fastreg(mr); |
|
|
|
mr->mr_cqe.done = frwr_wc_fastreg; |
|
mr->mr_regwr.wr.next = NULL; |
|
mr->mr_regwr.wr.wr_cqe = &mr->mr_cqe; |
|
mr->mr_regwr.wr.num_sge = 0; |
|
mr->mr_regwr.wr.opcode = IB_WR_REG_MR; |
|
mr->mr_regwr.wr.send_flags = 0; |
|
|
|
return ib_post_send(ep->re_id->qp, &mr->mr_regwr.wr, NULL); |
|
}
|
|
|