From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: "Wieckowski, Jacob" <Jacob.Wieckowski@vector.com>
Cc: "users@dpdk.org" <users@dpdk.org>
Subject: Re: DMA Transfers to PCIe Bar Memory
Date: Wed, 6 Nov 2024 20:46:04 +0300 [thread overview]
Message-ID: <20241106204604.444529d5@sovereign> (raw)
In-Reply-To: <AS4PR01MB10408FAF649A51468A49D9B34FD532@AS4PR01MB10408.eurprd01.prod.exchangelabs.com>
2024-11-06 15:50 (UTC+0000), Wieckowski, Jacob:
> Is DMA access to the bar memory of a PCIe device with DPDK possible?
> If so, which example project could be used as a reference to gain a better understanding of this topic?
Hi,
BAR (base address register) is a place in PCI configuration space,
so one really doesn't "DMA transfers to PCIe BAR memory" to be precise.
Read https://wiki.osdev.org/PCI_Express to explore the topic.
DPDK drivers write to BARs to configure devices,
specifically to setup memory-mapped IO which is used for DMA.
Take a look at this project, which is a toy version of DPDK,
and thus it is easier to grasp:
https://github.com/ixy-languages/ixy-languages
next prev parent reply other threads:[~2024-11-06 17:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-06 15:50 Wieckowski, Jacob
2024-11-06 17:46 ` Dmitry Kozlyuk [this message]
2024-11-07 9:16 ` Wieckowski, Jacob
2024-11-07 9:42 ` Dmitry Kozlyuk
2024-11-07 13:09 ` Wieckowski, Jacob
2024-11-07 16:13 ` Stephen Hemminger
2024-11-07 16:11 ` Stephen Hemminger
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