From: Christoph Hellwig <hch@infradead.org>
To: Leon Romanovsky <leon@kernel.org>
Cc: Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@mellanox.com>,
Christoph Hellwig <hch@infradead.org>,
Leon Romanovsky <leonro@mellanox.com>,
RDMA mailing list <linux-rdma@vger.kernel.org>,
Or Gerlitz <ogerlitz@mellanox.com>,
Yamin Friedman <yaminf@mellanox.com>,
Saeed Mahameed <saeedm@mellanox.com>,
linux-netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH rdma-next v1 2/3] RDMA/rw: Support threshold for registration vs scattering to local pages
Date: Mon, 7 Oct 2019 05:12:44 -0700 [thread overview]
Message-ID: <20191007121244.GA19843@infradead.org> (raw)
In-Reply-To: <20191007115819.9211-3-leon@kernel.org>
Sorry for nitpicking again, but..
On Mon, Oct 07, 2019 at 02:58:18PM +0300, Leon Romanovsky wrote:
> @@ -37,15 +39,15 @@ static inline bool rdma_rw_can_use_mr(struct ib_device *dev, u8 port_num)
> * Check if the device will use memory registration for this RW operation.
> * We currently always use memory registrations for iWarp RDMA READs, and
> * have a debug option to force usage of MRs.
> - *
> - * XXX: In the future we can hopefully fine tune this based on HCA driver
> - * input.
The above comment needs an updated a la:
* Check if the device will use memory registration for this RW operation.
* For RDMA READs we must use MRs on iWarp and can optionaly use them as an
* optimaztion otherwise. Additionally we have a debug option to force usage
* of MRs to help testing this code path.
> if (rdma_protocol_iwarp(dev, port_num) && dir == DMA_FROM_DEVICE)
> return true;
> + if (dev->attrs.max_sgl_rd && dir == DMA_FROM_DEVICE &&
> + dma_nents > dev->attrs.max_sgl_rd)
> + return true;
This can be simplified to:
if (dir == DMA_FROM_DEVICE &&
(rdma_protocol_iwarp(dev, port_num) ||
(dev->attrs.max_sgl_rd && dma_nents > dev->attrs.max_sgl_rd)))
return true;
next prev parent reply other threads:[~2019-10-07 12:12 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 11:58 [PATCH rdma-next v1 0/3] Optimize SGL registration Leon Romanovsky
2019-10-07 11:58 ` [PATCH mlx5-next v1 1/3] net/mlx5: Expose optimal performance scatter entries capability Leon Romanovsky
2019-10-07 11:58 ` [PATCH rdma-next v1 2/3] RDMA/rw: Support threshold for registration vs scattering to local pages Leon Romanovsky
2019-10-07 12:12 ` Christoph Hellwig [this message]
2019-10-07 12:36 ` Leon Romanovsky
2019-10-07 12:48 ` Christoph Hellwig
2019-10-07 13:17 ` Leon Romanovsky
2019-10-07 11:58 ` [PATCH rdma-next v1 3/3] RDMA/mlx5: Add capability for max sge to get optimized performance Leon Romanovsky
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