From: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
Date: Wed, 15 Jan 2020 12:43:40 +0000 (+0200)
Subject: net/rds: Use prefetch for On-Demand-Paging MR
X-Git-Tag: v5.10.7~3326^2~16^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b2dfc6765e45a3154800333234e4952b5412d792;p=platform%2Fkernel%2Flinux-rpi.git

net/rds: Use prefetch for On-Demand-Paging MR

Try prefetching pages when using On-Demand-Paging MR using
ib_advise_mr.

Signed-off-by: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
---

diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index ea4d7da..b34b24e 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -575,6 +575,7 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 			(IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
 			 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC |
 			 IB_ACCESS_ON_DEMAND);
+		struct ib_sge sge = {};
 		struct ib_mr *ib_mr;
 
 		if (!rds_ibdev->odp_capable) {
@@ -602,6 +603,14 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 		}
 		ibmr->u.mr = ib_mr;
 		ibmr->odp = 1;
+
+		sge.addr = virt_addr;
+		sge.length = length;
+		sge.lkey = ib_mr->lkey;
+
+		ib_advise_mr(rds_ibdev->pd,
+			     IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH_WRITE,
+			     IB_UVERBS_ADVISE_MR_FLAG_FLUSH, &sge, 1);
 		return ibmr;
 	}