From: David Howells <dhowells@redhat.com>
To: Tom Talpey <tom@talpey.com>
Cc: dhowells@redhat.com, Steve French <sfrench@samba.org>,
Stefan Metzmacher <metze@samba.org>,
Paulo Alcantara <pc@manguebit.com>,
Matthew Wilcox <willy@infradead.org>,
linux-cifs@vger.kernel.org
Subject: Re: cifs RDMA restrictions
Date: Wed, 02 Apr 2025 18:09:45 +0100 [thread overview]
Message-ID: <803441.1743613785@warthog.procyon.org.uk> (raw)
In-Reply-To: <7e1fc71c-2821-4294-833c-746c5fd7ee69@talpey.com>
Tom Talpey <tom@talpey.com> wrote:
> > But, will the device handle that? And can the DMA API map a single buffer
> > that big with the IOMMU? And does it need aligning to a larger pow-of-2
> > granule?
>
> Yes, maybe and no.
> 1 - The device just expects a base and length, so size is not an issue.
> 2 - The IOMMU is a platform question, if it's in use and the mapping
> allows, it should work.
> 3 - No specific alignment required.
Is there a way to query the RDMA layer as to its limits?
David
next prev parent reply other threads:[~2025-04-02 17:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-01 16:55 cifs RDMA restrictions David Howells
2025-04-01 18:02 ` Tom Talpey
2025-04-01 19:34 ` David Howells
2025-04-02 17:02 ` Tom Talpey
2025-04-02 17:09 ` David Howells [this message]
[not found] ` <CAH2r5ms2J06tJr4VEVDgmcj_1uqOnhYzbC1ybrMWDm=f8wVDoA@mail.gmail.com>
2025-04-02 18:04 ` Tom Talpey
2025-04-02 19:26 ` David Howells
2025-04-02 19:36 ` Tom Talpey
2025-04-02 19:54 ` [RFC PATCH] cifs: Collapse smbd_recv_*() into smbd_recv() and just use copy_to_iter() David Howells
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