Re: [PATCH v1 8/8] svcrdma: Remove svc_rdma_fastreg_mr::access_flags field

[Tom Talpey <tom-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org>]

On 11/23/2015 5:21 PM, Chuck Lever wrote:
> Clean up: The access_flags field is not used outside of
> rdma_read_chunk_frmr() and is always set to the same value.
>
> Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
> ---
>   include/linux/sunrpc/svc_rdma.h         |    1 -
>   net/sunrpc/xprtrdma/svc_rdma_recvfrom.c |    3 +--
>   2 files changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
> index 243edf4..eee2a0d 100644
> --- a/include/linux/sunrpc/svc_rdma.h
> +++ b/include/linux/sunrpc/svc_rdma.h
> @@ -107,7 +107,6 @@ struct svc_rdma_fastreg_mr {
>   	struct ib_mr *mr;
>   	struct scatterlist *sg;
>   	int sg_nents;
> -	unsigned long access_flags;
>   	enum dma_data_direction direction;
>   	struct list_head frmr_list;
>   };
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> index 9480043..8ab1ab5 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> @@ -240,7 +240,6 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
>   	read = min_t(int, (nents << PAGE_SHIFT) - *page_offset, rs_length);
>
>   	frmr->direction = DMA_FROM_DEVICE;
> -	frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
>   	frmr->sg_nents = nents;
>
>   	for (pno = 0; pno < nents; pno++) {
> @@ -308,7 +307,7 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
>   	reg_wr.wr.num_sge = 0;
>   	reg_wr.mr = frmr->mr;
>   	reg_wr.key = frmr->mr->lkey;
> -	reg_wr.access = frmr->access_flags;
> +	reg_wr.access = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);

Wait, the REMOTE_WRITE is there to support iWARP, but it isn't
needed for IB or RoCE. Shouldn't this be updated to peek at those
new attributes to decide, instead of remaining unconditional?


>   	reg_wr.wr.next = &read_wr.wr;
>
>   	/* Prepare RDMA_READ */
>
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