v4.19.13 snapshot.
diff --git a/net/sunrpc/xprtrdma/frwr_ops.c b/net/sunrpc/xprtrdma/frwr_ops.c
new file mode 100644
index 0000000..1bb00dd
--- /dev/null
+++ b/net/sunrpc/xprtrdma/frwr_ops.c
@@ -0,0 +1,615 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2015, 2017 Oracle. All rights reserved.
+ * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
+ */
+
+/* Lightweight memory registration using Fast Registration Work
+ * Requests (FRWR).
+ *
+ * FRWR features ordered asynchronous registration and deregistration
+ * of arbitrarily sized memory regions. This is the fastest and safest
+ * but most complex memory registration mode.
+ */
+
+/* Normal operation
+ *
+ * A Memory Region is prepared for RDMA READ or WRITE using a FAST_REG
+ * Work Request (frwr_op_map). When the RDMA operation is finished, this
+ * Memory Region is invalidated using a LOCAL_INV Work Request
+ * (frwr_op_unmap_sync).
+ *
+ * Typically these Work Requests are not signaled, and neither are RDMA
+ * SEND Work Requests (with the exception of signaling occasionally to
+ * prevent provider work queue overflows). This greatly reduces HCA
+ * interrupt workload.
+ *
+ * As an optimization, frwr_op_unmap marks MRs INVALID before the
+ * LOCAL_INV WR is posted. If posting succeeds, the MR is placed on
+ * rb_mrs immediately so that no work (like managing a linked list
+ * under a spinlock) is needed in the completion upcall.
+ *
+ * But this means that frwr_op_map() can occasionally encounter an MR
+ * that is INVALID but the LOCAL_INV WR has not completed. Work Queue
+ * ordering prevents a subsequent FAST_REG WR from executing against
+ * that MR while it is still being invalidated.
+ */
+
+/* Transport recovery
+ *
+ * ->op_map and the transport connect worker cannot run at the same
+ * time, but ->op_unmap can fire while the transport connect worker
+ * is running. Thus MR recovery is handled in ->op_map, to guarantee
+ * that recovered MRs are owned by a sending RPC, and not one where
+ * ->op_unmap could fire at the same time transport reconnect is
+ * being done.
+ *
+ * When the underlying transport disconnects, MRs are left in one of
+ * four states:
+ *
+ * INVALID: The MR was not in use before the QP entered ERROR state.
+ *
+ * VALID: The MR was registered before the QP entered ERROR state.
+ *
+ * FLUSHED_FR: The MR was being registered when the QP entered ERROR
+ * state, and the pending WR was flushed.
+ *
+ * FLUSHED_LI: The MR was being invalidated when the QP entered ERROR
+ * state, and the pending WR was flushed.
+ *
+ * When frwr_op_map encounters FLUSHED and VALID MRs, they are recovered
+ * with ib_dereg_mr and then are re-initialized. Because MR recovery
+ * allocates fresh resources, it is deferred to a workqueue, and the
+ * recovered MRs are placed back on the rb_mrs list when recovery is
+ * complete. frwr_op_map allocates another MR for the current RPC while
+ * the broken MR is reset.
+ *
+ * To ensure that frwr_op_map doesn't encounter an MR that is marked
+ * INVALID but that is about to be flushed due to a previous transport
+ * disconnect, the transport connect worker attempts to drain all
+ * pending send queue WRs before the transport is reconnected.
+ */
+
+#include <linux/sunrpc/rpc_rdma.h>
+#include <linux/sunrpc/svc_rdma.h>
+
+#include "xprt_rdma.h"
+#include <trace/events/rpcrdma.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_TRANS
+#endif
+
+bool
+frwr_is_supported(struct rpcrdma_ia *ia)
+{
+ struct ib_device_attr *attrs = &ia->ri_device->attrs;
+
+ if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
+ goto out_not_supported;
+ if (attrs->max_fast_reg_page_list_len == 0)
+ goto out_not_supported;
+ return true;
+
+out_not_supported:
+ pr_info("rpcrdma: 'frwr' mode is not supported by device %s\n",
+ ia->ri_device->name);
+ return false;
+}
+
+static int
+frwr_op_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
+{
+ unsigned int depth = ia->ri_max_frwr_depth;
+ struct rpcrdma_frwr *frwr = &mr->frwr;
+ int rc;
+
+ frwr->fr_mr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype, depth);
+ if (IS_ERR(frwr->fr_mr))
+ goto out_mr_err;
+
+ mr->mr_sg = kcalloc(depth, sizeof(*mr->mr_sg), GFP_KERNEL);
+ if (!mr->mr_sg)
+ goto out_list_err;
+
+ INIT_LIST_HEAD(&mr->mr_list);
+ sg_init_table(mr->mr_sg, depth);
+ init_completion(&frwr->fr_linv_done);
+ return 0;
+
+out_mr_err:
+ rc = PTR_ERR(frwr->fr_mr);
+ dprintk("RPC: %s: ib_alloc_mr status %i\n",
+ __func__, rc);
+ return rc;
+
+out_list_err:
+ rc = -ENOMEM;
+ dprintk("RPC: %s: sg allocation failure\n",
+ __func__);
+ ib_dereg_mr(frwr->fr_mr);
+ return rc;
+}
+
+static void
+frwr_op_release_mr(struct rpcrdma_mr *mr)
+{
+ int rc;
+
+ rc = ib_dereg_mr(mr->frwr.fr_mr);
+ if (rc)
+ pr_err("rpcrdma: final ib_dereg_mr for %p returned %i\n",
+ mr, rc);
+ kfree(mr->mr_sg);
+ kfree(mr);
+}
+
+static int
+__frwr_mr_reset(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr)
+{
+ struct rpcrdma_frwr *frwr = &mr->frwr;
+ int rc;
+
+ rc = ib_dereg_mr(frwr->fr_mr);
+ if (rc) {
+ pr_warn("rpcrdma: ib_dereg_mr status %d, frwr %p orphaned\n",
+ rc, mr);
+ return rc;
+ }
+
+ frwr->fr_mr = ib_alloc_mr(ia->ri_pd, ia->ri_mrtype,
+ ia->ri_max_frwr_depth);
+ if (IS_ERR(frwr->fr_mr)) {
+ pr_warn("rpcrdma: ib_alloc_mr status %ld, frwr %p orphaned\n",
+ PTR_ERR(frwr->fr_mr), mr);
+ return PTR_ERR(frwr->fr_mr);
+ }
+
+ dprintk("RPC: %s: recovered FRWR %p\n", __func__, frwr);
+ frwr->fr_state = FRWR_IS_INVALID;
+ return 0;
+}
+
+/* Reset of a single FRWR. Generate a fresh rkey by replacing the MR.
+ */
+static void
+frwr_op_recover_mr(struct rpcrdma_mr *mr)
+{
+ enum rpcrdma_frwr_state state = mr->frwr.fr_state;
+ struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
+ struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+ int rc;
+
+ rc = __frwr_mr_reset(ia, mr);
+ if (state != FRWR_FLUSHED_LI) {
+ trace_xprtrdma_dma_unmap(mr);
+ ib_dma_unmap_sg(ia->ri_device,
+ mr->mr_sg, mr->mr_nents, mr->mr_dir);
+ }
+ if (rc)
+ goto out_release;
+
+ rpcrdma_mr_put(mr);
+ r_xprt->rx_stats.mrs_recovered++;
+ return;
+
+out_release:
+ pr_err("rpcrdma: FRWR reset failed %d, %p released\n", rc, mr);
+ r_xprt->rx_stats.mrs_orphaned++;
+
+ spin_lock(&r_xprt->rx_buf.rb_mrlock);
+ list_del(&mr->mr_all);
+ spin_unlock(&r_xprt->rx_buf.rb_mrlock);
+
+ frwr_op_release_mr(mr);
+}
+
+/* On success, sets:
+ * ep->rep_attr.cap.max_send_wr
+ * ep->rep_attr.cap.max_recv_wr
+ * cdata->max_requests
+ * ia->ri_max_segs
+ *
+ * And these FRWR-related fields:
+ * ia->ri_max_frwr_depth
+ * ia->ri_mrtype
+ */
+static int
+frwr_op_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep,
+ struct rpcrdma_create_data_internal *cdata)
+{
+ struct ib_device_attr *attrs = &ia->ri_device->attrs;
+ int max_qp_wr, depth, delta;
+
+ ia->ri_mrtype = IB_MR_TYPE_MEM_REG;
+ if (attrs->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
+ ia->ri_mrtype = IB_MR_TYPE_SG_GAPS;
+
+ ia->ri_max_frwr_depth =
+ min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+ attrs->max_fast_reg_page_list_len);
+ dprintk("RPC: %s: device's max FR page list len = %u\n",
+ __func__, ia->ri_max_frwr_depth);
+
+ /* Add room for frwr register and invalidate WRs.
+ * 1. FRWR reg WR for head
+ * 2. FRWR invalidate WR for head
+ * 3. N FRWR reg WRs for pagelist
+ * 4. N FRWR invalidate WRs for pagelist
+ * 5. FRWR reg WR for tail
+ * 6. FRWR invalidate WR for tail
+ * 7. The RDMA_SEND WR
+ */
+ depth = 7;
+
+ /* Calculate N if the device max FRWR depth is smaller than
+ * RPCRDMA_MAX_DATA_SEGS.
+ */
+ if (ia->ri_max_frwr_depth < RPCRDMA_MAX_DATA_SEGS) {
+ delta = RPCRDMA_MAX_DATA_SEGS - ia->ri_max_frwr_depth;
+ do {
+ depth += 2; /* FRWR reg + invalidate */
+ delta -= ia->ri_max_frwr_depth;
+ } while (delta > 0);
+ }
+
+ max_qp_wr = ia->ri_device->attrs.max_qp_wr;
+ max_qp_wr -= RPCRDMA_BACKWARD_WRS;
+ max_qp_wr -= 1;
+ if (max_qp_wr < RPCRDMA_MIN_SLOT_TABLE)
+ return -ENOMEM;
+ if (cdata->max_requests > max_qp_wr)
+ cdata->max_requests = max_qp_wr;
+ ep->rep_attr.cap.max_send_wr = cdata->max_requests * depth;
+ if (ep->rep_attr.cap.max_send_wr > max_qp_wr) {
+ cdata->max_requests = max_qp_wr / depth;
+ if (!cdata->max_requests)
+ return -EINVAL;
+ ep->rep_attr.cap.max_send_wr = cdata->max_requests *
+ depth;
+ }
+ ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
+ ep->rep_attr.cap.max_send_wr += 1; /* for ib_drain_sq */
+ ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
+ ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
+ ep->rep_attr.cap.max_recv_wr += 1; /* for ib_drain_rq */
+
+ ia->ri_max_segs = max_t(unsigned int, 1, RPCRDMA_MAX_DATA_SEGS /
+ ia->ri_max_frwr_depth);
+ return 0;
+}
+
+/* FRWR mode conveys a list of pages per chunk segment. The
+ * maximum length of that list is the FRWR page list depth.
+ */
+static size_t
+frwr_op_maxpages(struct rpcrdma_xprt *r_xprt)
+{
+ struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+
+ return min_t(unsigned int, RPCRDMA_MAX_DATA_SEGS,
+ RPCRDMA_MAX_HDR_SEGS * ia->ri_max_frwr_depth);
+}
+
+static void
+__frwr_sendcompletion_flush(struct ib_wc *wc, const char *wr)
+{
+ if (wc->status != IB_WC_WR_FLUSH_ERR)
+ pr_err("rpcrdma: %s: %s (%u/0x%x)\n",
+ wr, ib_wc_status_msg(wc->status),
+ wc->status, wc->vendor_err);
+}
+
+/**
+ * frwr_wc_fastreg - Invoked by RDMA provider for a flushed FastReg WC
+ * @cq: completion queue (ignored)
+ * @wc: completed WR
+ *
+ */
+static void
+frwr_wc_fastreg(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ib_cqe *cqe = wc->wr_cqe;
+ struct rpcrdma_frwr *frwr =
+ container_of(cqe, struct rpcrdma_frwr, fr_cqe);
+
+ /* WARNING: Only wr_cqe and status are reliable at this point */
+ if (wc->status != IB_WC_SUCCESS) {
+ frwr->fr_state = FRWR_FLUSHED_FR;
+ __frwr_sendcompletion_flush(wc, "fastreg");
+ }
+ trace_xprtrdma_wc_fastreg(wc, frwr);
+}
+
+/**
+ * frwr_wc_localinv - Invoked by RDMA provider for a flushed LocalInv WC
+ * @cq: completion queue (ignored)
+ * @wc: completed WR
+ *
+ */
+static void
+frwr_wc_localinv(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ib_cqe *cqe = wc->wr_cqe;
+ struct rpcrdma_frwr *frwr = container_of(cqe, struct rpcrdma_frwr,
+ fr_cqe);
+
+ /* WARNING: Only wr_cqe and status are reliable at this point */
+ if (wc->status != IB_WC_SUCCESS) {
+ frwr->fr_state = FRWR_FLUSHED_LI;
+ __frwr_sendcompletion_flush(wc, "localinv");
+ }
+ trace_xprtrdma_wc_li(wc, frwr);
+}
+
+/**
+ * frwr_wc_localinv_wake - Invoked by RDMA provider for a signaled LocalInv WC
+ * @cq: completion queue (ignored)
+ * @wc: completed WR
+ *
+ * Awaken anyone waiting for an MR to finish being fenced.
+ */
+static void
+frwr_wc_localinv_wake(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct ib_cqe *cqe = wc->wr_cqe;
+ struct rpcrdma_frwr *frwr = container_of(cqe, struct rpcrdma_frwr,
+ fr_cqe);
+
+ /* WARNING: Only wr_cqe and status are reliable at this point */
+ if (wc->status != IB_WC_SUCCESS) {
+ frwr->fr_state = FRWR_FLUSHED_LI;
+ __frwr_sendcompletion_flush(wc, "localinv");
+ }
+ complete(&frwr->fr_linv_done);
+ trace_xprtrdma_wc_li_wake(wc, frwr);
+}
+
+/* Post a REG_MR Work Request to register a memory region
+ * for remote access via RDMA READ or RDMA WRITE.
+ */
+static struct rpcrdma_mr_seg *
+frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
+ int nsegs, bool writing, struct rpcrdma_mr **out)
+{
+ struct rpcrdma_ia *ia = &r_xprt->rx_ia;
+ bool holes_ok = ia->ri_mrtype == IB_MR_TYPE_SG_GAPS;
+ struct rpcrdma_frwr *frwr;
+ struct rpcrdma_mr *mr;
+ struct ib_mr *ibmr;
+ struct ib_reg_wr *reg_wr;
+ int i, n;
+ u8 key;
+
+ mr = NULL;
+ do {
+ if (mr)
+ rpcrdma_mr_defer_recovery(mr);
+ mr = rpcrdma_mr_get(r_xprt);
+ if (!mr)
+ return ERR_PTR(-EAGAIN);
+ } while (mr->frwr.fr_state != FRWR_IS_INVALID);
+ frwr = &mr->frwr;
+ frwr->fr_state = FRWR_IS_VALID;
+
+ if (nsegs > ia->ri_max_frwr_depth)
+ nsegs = ia->ri_max_frwr_depth;
+ for (i = 0; i < nsegs;) {
+ if (seg->mr_page)
+ sg_set_page(&mr->mr_sg[i],
+ seg->mr_page,
+ seg->mr_len,
+ offset_in_page(seg->mr_offset));
+ else
+ sg_set_buf(&mr->mr_sg[i], seg->mr_offset,
+ seg->mr_len);
+
+ ++seg;
+ ++i;
+ if (holes_ok)
+ continue;
+ if ((i < nsegs && offset_in_page(seg->mr_offset)) ||
+ offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
+ break;
+ }
+ mr->mr_dir = rpcrdma_data_dir(writing);
+
+ mr->mr_nents = ib_dma_map_sg(ia->ri_device, mr->mr_sg, i, mr->mr_dir);
+ if (!mr->mr_nents)
+ goto out_dmamap_err;
+ trace_xprtrdma_dma_map(mr);
+
+ ibmr = frwr->fr_mr;
+ n = ib_map_mr_sg(ibmr, mr->mr_sg, mr->mr_nents, NULL, PAGE_SIZE);
+ if (unlikely(n != mr->mr_nents))
+ goto out_mapmr_err;
+
+ key = (u8)(ibmr->rkey & 0x000000FF);
+ ib_update_fast_reg_key(ibmr, ++key);
+
+ reg_wr = &frwr->fr_regwr;
+ reg_wr->mr = ibmr;
+ reg_wr->key = ibmr->rkey;
+ reg_wr->access = writing ?
+ IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
+ IB_ACCESS_REMOTE_READ;
+
+ mr->mr_handle = ibmr->rkey;
+ mr->mr_length = ibmr->length;
+ mr->mr_offset = ibmr->iova;
+
+ *out = mr;
+ return seg;
+
+out_dmamap_err:
+ pr_err("rpcrdma: failed to DMA map sg %p sg_nents %d\n",
+ mr->mr_sg, i);
+ frwr->fr_state = FRWR_IS_INVALID;
+ rpcrdma_mr_put(mr);
+ return ERR_PTR(-EIO);
+
+out_mapmr_err:
+ pr_err("rpcrdma: failed to map mr %p (%d/%d)\n",
+ frwr->fr_mr, n, mr->mr_nents);
+ rpcrdma_mr_defer_recovery(mr);
+ return ERR_PTR(-EIO);
+}
+
+/* Post Send WR containing the RPC Call message.
+ *
+ * For FRMR, chain any FastReg WRs to the Send WR. Only a
+ * single ib_post_send call is needed to register memory
+ * and then post the Send WR.
+ */
+static int
+frwr_op_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req)
+{
+ struct ib_send_wr *post_wr;
+ struct rpcrdma_mr *mr;
+
+ post_wr = &req->rl_sendctx->sc_wr;
+ list_for_each_entry(mr, &req->rl_registered, mr_list) {
+ struct rpcrdma_frwr *frwr;
+
+ frwr = &mr->frwr;
+
+ frwr->fr_cqe.done = frwr_wc_fastreg;
+ frwr->fr_regwr.wr.next = post_wr;
+ frwr->fr_regwr.wr.wr_cqe = &frwr->fr_cqe;
+ frwr->fr_regwr.wr.num_sge = 0;
+ frwr->fr_regwr.wr.opcode = IB_WR_REG_MR;
+ frwr->fr_regwr.wr.send_flags = 0;
+
+ 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, NULL);
+}
+
+/* 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_init(&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;
+ const struct ib_send_wr *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,
+};