net: stmmac: dwxgmac: Account for the primary MAC address for UC filtering

[ Upstream commit 2739d6f9a2b8729b0d85cbe0dc93e1d68670b6f2 ]

The same filter slots are used to store the main MAC address as well as
the address for the unicast filter. Let's account for that when deciding
whether or not to use promisc when programming the UC list in hardware.

Fixes: 0efedbf11f07 ("net: stmmac: xgmac: Fix XGMAC selftests")
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260826140500.616466-5-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
index ee41c77426f1abf31042186b8f71facf3fae14e3..42cd0a01a9cdc232b5d6cdd57467bdd5a35c4806 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -541,7 +541,7 @@ static void dwxgmac2_set_filter(struct mac_device_info *hw,
        dwxgmac2_set_mchash(ioaddr, mc_filter, mcbitslog2);
 
        /* Handle multiple unicast addresses */
-       if (netdev_uc_count(dev) > hw->unicast_filter_entries) {
+       if (netdev_uc_count(dev) + 1 > hw->unicast_filter_entries) {
                value |= XGMAC_FILTER_PR;
        } else {
                struct netdev_hw_addr *ha;