From: Santosh Shilimkar <santosh.shilimkar@oracle.com>
To: Gerd Rausch <gerd.rausch@oracle.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"rds-devel@oss.oracle.com" <rds-devel@oss.oracle.com>
Subject: Re: [PATCH net 1/1] net/rds: dma_map_sg is entitled to merge entries
Date: Tue, 17 Aug 2021 17:07:19 +0000 [thread overview]
Message-ID: <30038EA9-7220-4FBC-8601-50D226244722@oracle.com> (raw)
In-Reply-To: <60efc69f-1f35-529d-a7ef-da0549cad143@oracle.com>
> On Aug 17, 2021, at 10:04 AM, Gerd Rausch <gerd.rausch@oracle.com> wrote:
>
> Function "dma_map_sg" is entitled to merge adjacent entries
> and return a value smaller than what was passed as "nents".
>
> Subsequently "ib_map_mr_sg" needs to work with this value ("sg_dma_len")
> rather than the original "nents" parameter ("sg_len").
>
> This old RDS bug was exposed and reliably causes kernel panics
> (using RDMA operations "rds-stress -D") on x86_64 starting with:
> commit c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
>
> Simply put: Linux 5.11 and later.
>
> Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
> ---
> net/rds/ib_frmr.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Looks good to me Gerd. Thanks !!
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
next prev parent reply other threads:[~2021-08-17 17:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-17 17:04 [PATCH net 1/1] net/rds: dma_map_sg is entitled to merge entries Gerd Rausch
2021-08-17 17:07 ` Santosh Shilimkar [this message]
2021-08-18 22:40 ` patchwork-bot+netdevbpf
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