From: Simon Horman <horms@kernel.org>
To: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: netdev@vger.kernel.org, "Jonas Gorski" <jonas.gorski@gmail.com>,
"Andrew Lunn" <andrew@lunn.ch>,
"Vladimir Oltean" <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@kernel.org>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Rafał Miłecki" <rafal@milecki.pl>,
"Broadcom internal kernel review list"
<bcm-kernel-feedback-list@broadcom.com>,
"Jon Mason" <jon.mason@broadcom.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH net v4 2/2] net: dsa: b53: restore the NSP IMP port 2 Gbps mode
Date: Tue, 3 Nov 2026 11:22:13 +0000 [thread overview]
Message-ID: <20261103112213.GG865646@horms.kernel.org> (raw)
In-Reply-To: <20261029211540.4123250-3-florian.fainelli@broadcom.com>
On Thu, Oct 29, 2026 at 02:15:40PM -0700, Florian Fainelli wrote:
> The Northstar Plus IMP port uses the switch's proprietary 2 Gbps mode for
> its internal link to the AMAC. Its fixed-link description reports 1 Gbps,
> so applying that speed clears PORT_OVERRIDE_SPEED_2000M and leaves the two
> ends of the internal link configured at different speeds.
>
> Force the 2 Gbps mode and flow control for BCM5301x and NSP CPU ports. The
> mismatch caused switch output queue discards on both copper and SerDes
> ports, with one discard for every TCP retransmission. With both ends
> restored to their high-speed modes, iperf3 reports no retransmissions.
>
> Fixes: b6a8a5477fe9 ("net: dsa: b53: fix resetting speed and pause on forced link")
> Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Simon Horman <horms@kernel.org>
prev parent reply other threads:[~2026-11-03 11:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-29 21:15 [PATCH net v4 0/2] Fix TCP retransmissions on NS/NSP SoCs Florian Fainelli
2026-10-29 21:15 ` [PATCH net v4 1/2] net: ethernet: bgmac: preserve forced 2.5 Gbps link speed Florian Fainelli
2026-11-02 21:50 ` netdev-bot+sashiko
2026-11-02 23:24 ` Florian Fainelli
2026-11-03 11:21 ` Simon Horman
2026-10-29 21:15 ` [PATCH net v4 2/2] net: dsa: b53: restore the NSP IMP port 2 Gbps mode Florian Fainelli
2026-11-02 21:50 ` netdev-bot+sashiko
2026-11-02 23:25 ` Florian Fainelli
2026-11-03 11:22 ` Simon Horman [this message]
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