From: Simon Horman <horms@kernel.org>
To: Daniel Machon <daniel.machon@microchip.com>
Cc: Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Horatiu Vultur <horatiu.vultur@microchip.com>,
Steen Hegelund <steen.hegelund@microchip.com>,
UNGLinuxDriver@microchip.com, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>,
Herve Codina <herve.codina@bootlin.com>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mohsin Bashir <mohsin.bashr@gmail.com>,
Richard Cochran <richardcochran@gmail.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net-next v9 11/15] net: lan966x: add PCIe FDMA support
Date: Fri, 2 Oct 2026 15:14:55 +0100 [thread overview]
Message-ID: <20261002141455.GI13925@horms.kernel.org> (raw)
In-Reply-To: <20260928-lan966x-pci-fdma-v9-11-a17caf60f89a@microchip.com>
On Mon, Sep 28, 2026 at 09:32:59PM +0200, Daniel Machon wrote:
> Add PCIe FDMA support for lan966x. The PCIe FDMA path uses contiguous
> DMA buffers mapped through the endpoint's ATU, with memcpy-based frame
> transfer instead of per-page DMA mappings.
>
> With PCIe FDMA, throughput increases from ~33 Mbps (register-based I/O)
> to ~620 Mbps on an Intel x86 host with a lan966x PCIe card.
>
> The RX path uses its own copy of lan966x_hw_offload() that reports back
> when skb_vlan_untag() frees the skb, so the caller can drop the frame
> instead of touching it.
>
> XDP is not supported on this path yet, so do not advertise xdp_features
> and reject program attach for PCIe instances.
>
> Tested-by: Herve Codina <herve.codina@bootlin.com>
> Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Simon Horman <horms@kernel.org>
next prev parent reply other threads:[~2026-10-02 14:15 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-28 19:32 [PATCH net-next v9 00/15] net: lan966x: add support for PCIe FDMA Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 01/15] MAINTAINERS: add FDMA library to Sparx5 SoC entry Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 02/15] net: microchip: fdma: rename contiguous dataptr helpers Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 03/15] net: microchip: fdma: add PCIe ATU support Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-09-28 19:32 ` [PATCH net-next v9 04/15] net: microchip: fdma: use little-endian types for descriptor fields Daniel Machon
2026-10-02 13:25 ` Simon Horman
2026-09-28 19:32 ` [PATCH net-next v9 05/15] net: lan966x: add FDMA LLP register write helper Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 06/15] net: lan966x: export FDMA helpers for reuse Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 07/15] net: lan966x: use a dedicated device for DMA operations Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 08/15] net: lan966x: add FDMA ops dispatch for PCIe support Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 09/15] net: lan966x: clear FDMA interrupt stickies after switch reset Daniel Machon
2026-09-28 19:32 ` [PATCH net-next v9 10/15] net: lan966x: add shutdown callback to stop the FDMA on reboot Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-09-28 19:32 ` [PATCH net-next v9 11/15] net: lan966x: add PCIe FDMA support Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-10-02 9:02 ` Daniel Machon
2026-10-02 14:14 ` Simon Horman [this message]
2026-09-28 19:33 ` [PATCH net-next v9 12/15] net: lan966x: add PCIe FDMA MTU change support Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-10-02 9:08 ` Daniel Machon
2026-09-28 19:33 ` [PATCH net-next v9 13/15] net: lan966x: add PCIe FDMA XDP support Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-10-02 9:11 ` Daniel Machon
2026-09-28 19:33 ` [PATCH net-next v9 14/15] misc: lan966x-pci: dts: extend cpu reg to cover PCIE DBI space Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-09-28 19:33 ` [PATCH net-next v9 15/15] misc: lan966x-pci: dts: add fdma interrupt to overlay Daniel Machon
2026-10-02 7:33 ` netdev-bot+sashiko
2026-10-02 9:16 ` Daniel Machon
2026-10-02 20:20 ` [PATCH net-next v9 00/15] net: lan966x: add support for PCIe FDMA patchwork-bot+netdevbpf
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