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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= , Broadcom internal kernel review list , Arnd Bergmann , linux-kernel@vger.kernel.org (open list) Subject: [PATCH net v2 1/2] net: ethernet: bgmac: preserve forced 2.5 Gbps link speed Date: Thu, 22 Oct 2026 14:11:03 -0700 Message-Id: <20261022211104.2091128-2-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261022211104.2091128-1-florian.fainelli@broadcom.com> References: <20261022211104.2091128-1-florian.fainelli@broadcom.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Northstar and Northstar Plus use a 2.5 Gbps internal link between the AMAC and the switch. BGMAC_FEAT_FORCE_SPEED_2500 makes bgmac_miiconfig() configure that speed, but bgmac_adjust_link() subsequently replaces it with the synthetic fixed PHY's 1 Gbps speed. Use the forced speed when processing link changes so the MAC remains at 2.5 Gbps. Together with configuring the switch IMP port for its 2 Gbps mode, this eliminates the output queue discards that caused approximately 1000 TCP retransmissions per second during an iperf3 transmit test. Fixes: f6a95a24957a ("net: ethernet: bgmac: Add platform device support") Signed-off-by: Florian Fainelli --- drivers/net/ethernet/broadcom/bgmac.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c index 3e9c57196a39..11487ff48e0d 100644 --- a/drivers/net/ethernet/broadcom/bgmac.c +++ b/drivers/net/ethernet/broadcom/bgmac.c @@ -1415,11 +1415,15 @@ void bgmac_adjust_link(struct net_device *net_dev) { struct bgmac *bgmac = netdev_priv(net_dev); struct phy_device *phy_dev = net_dev->phydev; + int speed = phy_dev->speed; bool update = false; + if (bgmac->feature_flags & BGMAC_FEAT_FORCE_SPEED_2500) + speed = SPEED_2500; + if (phy_dev->link) { - if (phy_dev->speed != bgmac->mac_speed) { - bgmac->mac_speed = phy_dev->speed; + if (speed != bgmac->mac_speed) { + bgmac->mac_speed = speed; update = true; } -- 2.34.1