2021年9月30日(木) 20:18 Zhu Yanjun zyjzyj2000@gmail.com:
On Thu, Sep 30, 2021 at 7:06 PM Shunsuke Mie mie@igel.co.jp wrote:
2021年9月30日(木) 16:23 Zhu Yanjun zyjzyj2000@gmail.com:
On Thu, Sep 30, 2021 at 2:58 PM Shunsuke Mie mie@igel.co.jp wrote:
2021年9月30日(木) 15:37 Zhu Yanjun zyjzyj2000@gmail.com:
On Thu, Sep 30, 2021 at 2:20 PM Shunsuke Mie mie@igel.co.jp wrote:
Implement a new provider method for dma-buf base memory registration.
Signed-off-by: Shunsuke Mie mie@igel.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;Do we need to set vmr to zero like the following?
memset(vmr, 0, sizeof(*vmr));
Zhu Yanjun
Thank you for your quick response.
I think it is better to clear the vmr. Actually the mlx5 driver allocates the vmr using calloc().
In addition, rxe_reg_mr() (not rxe_reg_dmabuf_mr()) is used the malloc and not clear the vmr. I think It has to be fixed too. Should I make another patch to fix this problem?
Yes. Please.
Zhu Yanjun
Thanks a lot. Shunsuke
~
I looked into the vmr more, but there was no need to clear it. Moreover, some implementations also use malloc without memory clear.
I confronted a lot of problems with memory not initialization. And a latest bug is https://www.spinics.net/lists/linux-rdma/msg105001.html
So it is a good habit to clear a newly allocated memory.
Zhu Yanjun
Thanks, Shunsuke
Ok, I understand that thought. I'll send a patch.
Shunsuke.