xprtrdma: Add "init MRs" memreg op
This method is used when setting up a new transport instance to
create a pool of Memory Region objects that will be used to register
memory during operation.
Memory Regions are not needed for "physical" registration, since
->prepare and ->release are no-ops for that mode.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-by: Devesh Sharma <Devesh.Sharma@Emulex.Com>
Tested-by: Meghana Cheripady <Meghana.Cheripady@Emulex.Com>
Tested-by: Veeresh U. Kokatnur <veereshuk@chelsio.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/net/sunrpc/xprtrdma/fmr_ops.c b/net/sunrpc/xprtrdma/fmr_ops.c
index 888aa10..825ce96 100644
--- a/net/sunrpc/xprtrdma/fmr_ops.c
+++ b/net/sunrpc/xprtrdma/fmr_ops.c
@@ -29,6 +29,47 @@
rpcrdma_max_segments(r_xprt) * RPCRDMA_MAX_FMR_SGES);
}
+static int
+fmr_op_init(struct rpcrdma_xprt *r_xprt)
+{
+ struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
+ int mr_access_flags = IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ;
+ struct ib_fmr_attr fmr_attr = {
+ .max_pages = RPCRDMA_MAX_FMR_SGES,
+ .max_maps = 1,
+ .page_shift = PAGE_SHIFT
+ };
+ struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
+ struct rpcrdma_mw *r;
+ int i, rc;
+
+ INIT_LIST_HEAD(&buf->rb_mws);
+ INIT_LIST_HEAD(&buf->rb_all);
+
+ i = (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS;
+ dprintk("RPC: %s: initalizing %d FMRs\n", __func__, i);
+
+ while (i--) {
+ r = kzalloc(sizeof(*r), GFP_KERNEL);
+ if (!r)
+ return -ENOMEM;
+
+ r->r.fmr = ib_alloc_fmr(pd, mr_access_flags, &fmr_attr);
+ if (IS_ERR(r->r.fmr))
+ goto out_fmr_err;
+
+ list_add(&r->mw_list, &buf->rb_mws);
+ list_add(&r->mw_all, &buf->rb_all);
+ }
+ return 0;
+
+out_fmr_err:
+ rc = PTR_ERR(r->r.fmr);
+ dprintk("RPC: %s: ib_alloc_fmr status %i\n", __func__, rc);
+ kfree(r);
+ return rc;
+}
+
/* Use the ib_map_phys_fmr() verb to register a memory region
* for remote access via RDMA READ or RDMA WRITE.
*/
@@ -109,5 +150,6 @@
.ro_map = fmr_op_map,
.ro_unmap = fmr_op_unmap,
.ro_maxpages = fmr_op_maxpages,
+ .ro_init = fmr_op_init,
.ro_displayname = "fmr",
};