linux-kernel - [RFC PATCH v2 1/1] Providers/rxe: Add dma-buf support

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Date:   Thu, 30 Sep 2021 15:20:14 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Zhu Yanjun <zyjzyj2000@...il.com>
Cc:     Shunsuke Mie <mie@...l.co.jp>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jianxin Xiong <jianxin.xiong@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Maor Gottlieb <maorg@...dia.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, dhobsong@...l.co.jp, taki@...l.co.jp,
        etom@...l.co.jp
Subject: [RFC PATCH v2 1/1] Providers/rxe: Add dma-buf support

Implement a new provider method for dma-buf base memory registration.

Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
---
 providers/rxe/rxe.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/providers/rxe/rxe.c b/providers/rxe/rxe.c
index 3c3ea8bb..84e00e60 100644
--- a/providers/rxe/rxe.c
+++ b/providers/rxe/rxe.c
@@ -239,6 +239,26 @@ static struct ibv_mr *rxe_reg_mr(struct ibv_pd *pd, void *addr, size_t length,
 	return &vmr->ibv_mr;
 }
 
+static struct ibv_mr *rxe_reg_dmabuf_mr(struct ibv_pd *pd, uint64_t offset,
+					size_t length, uint64_t iova, int fd,
+					int access)
+{
+	struct verbs_mr *vmr;
+	int ret;
+
+	vmr = malloc(sizeof(*vmr));
+	if (!vmr)
+		return NULL;
+
+	ret = ibv_cmd_reg_dmabuf_mr(pd, offset, length, iova, fd, access, vmr);
+	if (ret) {
+		free(vmr);
+		return NULL;
+	}
+
+	return &vmr->ibv_mr;
+}
+
 static int rxe_dereg_mr(struct verbs_mr *vmr)
 {
 	int ret;
@@ -1706,6 +1726,7 @@ static const struct verbs_context_ops rxe_ctx_ops = {
 	.alloc_pd = rxe_alloc_pd,
 	.dealloc_pd = rxe_dealloc_pd,
 	.reg_mr = rxe_reg_mr,
+	.reg_dmabuf_mr = rxe_reg_dmabuf_mr,
 	.dereg_mr = rxe_dereg_mr,
 	.alloc_mw = rxe_alloc_mw,
 	.dealloc_mw = rxe_dealloc_mw,
-- 
2.17.1