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Message-ID: <20250819205632.1368993-1-dw@davidwei.uk> Date: Tue, 19 Aug 2025 13:56:32 -0700 From: David Wei <dw@...idwei.uk> To: netdev@...r.kernel.org Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com> Subject: [PATCH net-next v1] iou-zcrx: update documentation Update io_uring zc rx documentation with: * Current supported NICs with minimum FW reqs * Mellanox needs HW GRO explicitly enabled Signed-off-by: David Wei <dw@...idwei.uk> --- Documentation/networking/iou-zcrx.rst | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/networking/iou-zcrx.rst b/Documentation/networking/iou-zcrx.rst index 0127319b30bb..bfc08154e697 100644 --- a/Documentation/networking/iou-zcrx.rst +++ b/Documentation/networking/iou-zcrx.rst @@ -41,6 +41,16 @@ RSS In addition to flow steering above, RSS is required to steer all other non-zero copy flows away from queues that are configured for io_uring ZC Rx. +Supported NICs +============== + +Zero copy Rx currently support two NIC families: + +* Broadcom Thor (BCM95750x) family + * Minimum FW is 232 +* Mellanox ConnectX-7 (MT2910) family + * Minimum FW is 28.42 + Usage ===== @@ -57,6 +67,10 @@ Enable header/data split:: ethtool -G eth0 tcp-data-split on +Enable HW GRO (for Mellanox NICs):: + + ethtool -K eth0 rx-gro-hw on + Carve out half of the HW Rx queues for zero copy using RSS:: ethtool -X eth0 equal 1 -- 2.47.3
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