Re: [PATCH net-next] net: phy: broadcom: enable jumbo frames on BCM54xx

From: patchwork-bot+netdevbpf

Date: Wed Sep 16 2026 - 20:45:32 EST


Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Mon, 14 Sep 2026 11:47:02 +0200 you wrote:
> Jumbo packets need two bits that default to off, extended packet length in
> the auxiliary control register and PCS transmit FIFO elasticity in the
> extended control register. The latter raises the transmit limit from 4.5
> KB to 9 KB at the cost of 16 ns of 1000BASE-T transmit latency, and the
> two together take copper mode to 10 KB.
>
> Without them such frames are lost on a 100M link while the same frames
> pass at 1G. On a Raspberry Pi CM5, which uses a BCM54210PE, 9142 byte
> frames at 100M are lost 20 out of 20 with the MAC counting every one
> as transmitted. The same frames over the same path at 1G arrive intact.
>
> [...]

Here is the summary with links:
- [net-next] net: phy: broadcom: enable jumbo frames on BCM54xx
https://git.kernel.org/netdev/net-next/c/3c8abdbe345b

You are awesome, thank you!
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