static void fmr_op_release_mr(struct rpcrdma_mw *r) { LIST_HEAD(unmap_list); int rc; /* Ensure MW is not on any rl_registered list */ if (!list_empty(&r->mw_list)) list_del(&r->mw_list); kfree(r->fmr.fm_physaddrs); kfree(r->mw_sg); /* In case this one was left mapped, try to unmap it * to prevent dealloc_fmr from failing with EBUSY */ rc = __fmr_unmap(r); if (rc) pr_err("rpcrdma: final ib_unmap_fmr for %p failed %i\n", r, rc); rc = ib_dealloc_fmr(r->fmr.fm_mr); if (rc) pr_err("rpcrdma: final ib_dealloc_fmr for %p returned %i\n", r, rc); kfree(r); }
/* Use the ib_unmap_fmr() verb to prevent further remote * access via RDMA READ or RDMA WRITE. */ static int fmr_op_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg) { struct rpcrdma_ia *ia = &r_xprt->rx_ia; struct rpcrdma_mr_seg *seg1 = seg; struct rpcrdma_mw *mw = seg1->rl_mw; int rc, nsegs = seg->mr_nsegs; dprintk("RPC: %s: FMR %p\n", __func__, mw); seg1->rl_mw = NULL; while (seg1->mr_nsegs--) rpcrdma_unmap_one(ia->ri_device, seg++); rc = __fmr_unmap(mw); if (rc) goto out_err; rpcrdma_put_mw(r_xprt, mw); return nsegs; out_err: /* The FMR is abandoned, but remains in rb_all. fmr_op_destroy * will attempt to release it when the transport is destroyed. */ dprintk("RPC: %s: ib_unmap_fmr status %i\n", __func__, rc); return nsegs; }
/* Reset of a single FMR. */ static void fmr_op_recover_mr(struct rpcrdma_mw *mw) { struct rpcrdma_xprt *r_xprt = mw->mw_xprt; int rc; /* ORDER: invalidate first */ rc = __fmr_unmap(mw); /* ORDER: then DMA unmap */ ib_dma_unmap_sg(r_xprt->rx_ia.ri_device, mw->mw_sg, mw->mw_nents, mw->mw_dir); if (rc) goto out_release; rpcrdma_put_mw(r_xprt, mw); r_xprt->rx_stats.mrs_recovered++; return; out_release: pr_err("rpcrdma: FMR reset failed (%d), %p released\n", rc, mw); r_xprt->rx_stats.mrs_orphaned++; spin_lock(&r_xprt->rx_buf.rb_mwlock); list_del(&mw->mw_all); spin_unlock(&r_xprt->rx_buf.rb_mwlock); fmr_op_release_mr(mw); }
/* Use the ib_map_phys_fmr() verb to register a memory region * for remote access via RDMA READ or RDMA WRITE. */ static int fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg, int nsegs, bool writing) { struct rpcrdma_ia *ia = &r_xprt->rx_ia; struct ib_device *device = ia->ri_device; enum dma_data_direction direction = rpcrdma_data_dir(writing); struct rpcrdma_mr_seg *seg1 = seg; int len, pageoff, i, rc; struct rpcrdma_mw *mw; mw = seg1->rl_mw; seg1->rl_mw = NULL; if (!mw) { mw = rpcrdma_get_mw(r_xprt); if (!mw) return -ENOMEM; } else { /* this is a retransmit; generate a fresh rkey */ rc = __fmr_unmap(mw); if (rc) return rc; } pageoff = offset_in_page(seg1->mr_offset); seg1->mr_offset -= pageoff; /* start of page */ seg1->mr_len += pageoff; len = -pageoff; if (nsegs > RPCRDMA_MAX_FMR_SGES) nsegs = RPCRDMA_MAX_FMR_SGES; for (i = 0; i < nsegs;) { rpcrdma_map_one(device, seg, direction); mw->r.fmr.physaddrs[i] = seg->mr_dma; len += seg->mr_len; ++seg; ++i; /* Check for holes */ if ((i < nsegs && offset_in_page(seg->mr_offset)) || offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len)) break; } rc = ib_map_phys_fmr(mw->r.fmr.fmr, mw->r.fmr.physaddrs, i, seg1->mr_dma); if (rc) goto out_maperr; seg1->rl_mw = mw; seg1->mr_rkey = mw->r.fmr.fmr->rkey; seg1->mr_base = seg1->mr_dma + pageoff; seg1->mr_nsegs = i; seg1->mr_len = len; return i; out_maperr: dprintk("RPC: %s: ib_map_phys_fmr %u@0x%llx+%i (%d) status %i\n", __func__, len, (unsigned long long)seg1->mr_dma, pageoff, i, rc); while (i--) rpcrdma_unmap_one(device, --seg); return rc; }