Commit 96e8cb5527ce for kernel

commit 96e8cb5527ce50c024a8e2d22d2bfedeccaf97d0
Author: Maxime Chevallier <maxime.chevallier@bootlin.com>
Date:   Wed Aug 26 16:04:58 2026 +0200

    net: stmmac: selftests: Don't test flow control for small rx fifos

    On dwmac1000, dwmac4 and dwxgmac, we only emit pause frames if there's
    at least 4096 bytes in each queue's fifo.

    The phylink mac capabilities are still MAC_ASYM_PAUSE | MAC_SYM_PAUSE as
    otherwise we won't be able to negotiate 'rx on' pause. ASYM only will
    prevent negotiating 'rx off tx on', while SYM only doesn't really
    matche the reality (not symmetric if we can only do RX pause).

    Fixes: 091810dbded9 ("net: stmmac: Introduce selftests support")
    Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
    Reviewed-by: Andrew Lunn <andrew@lunn.ch>
    Link: https://patch.msgid.link/20260826140500.616466-7-maxime.chevallier@bootlin.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
index ae236a264e74..6372ec7c3f31 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c
@@ -739,12 +739,24 @@ static int stmmac_test_flowctrl(struct stmmac_priv *priv)
 	u32 rx_cnt = priv->plat->rx_queues_to_use;
 	struct mac_device_info *mac = priv->hw;
 	struct stmmac_test_priv *tpriv;
+	unsigned int rx_fifo_size;
 	unsigned int pkt_count;
 	int i, ret = 0;

 	if (!(mac->link.caps & MAC_SYM_PAUSE))
 		return -EOPNOTSUPP;

+	rx_fifo_size = priv->plat->rx_fifo_size;
+	if (!rx_fifo_size)
+		rx_fifo_size = priv->dma_cap.rx_fifo_size;
+
+	/* No pause frame is emitted if we don't have at least 4096 bytes per
+	 * queue, except on dwmac100.
+	 */
+	if (priv->plat->core_type != DWMAC_CORE_MAC100 &&
+	    rx_fifo_size / priv->plat->rx_queues_to_use < 4096)
+		return -EOPNOTSUPP;
+
 	tpriv = kzalloc_obj(*tpriv);
 	if (!tpriv)
 		return -ENOMEM;
@@ -758,9 +770,7 @@ static int stmmac_test_flowctrl(struct stmmac_priv *priv)
 	dev_add_pack(&tpriv->pt);

 	/* Compute minimum number of packets to make FIFO full */
-	pkt_count = priv->plat->rx_fifo_size;
-	if (!pkt_count)
-		pkt_count = priv->dma_cap.rx_fifo_size;
+	pkt_count = rx_fifo_size;
 	pkt_count /= 1400;
 	pkt_count *= 2;