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[92.34.204.253]) by smtp.gmail.com with ESMTPSA id i12sm849825lfb.301.2021.09.13.07.45.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Sep 2021 07:45:31 -0700 (PDT) From: Linus Walleij To: Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , "David S . Miller" , Jakub Kicinski Cc: netdev@vger.kernel.org, DENG Qingfang , Mauri Sandberg , =?utf-8?q?Alvin_=C5=A0ipraga?= , Linus Walleij Subject: [PATCH net-next 1/8] net: dsa: rtl8366rb: Support bridge offloading Date: Mon, 13 Sep 2021 16:42:53 +0200 Message-Id: <20210913144300.1265143-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210913144300.1265143-1-linus.walleij@linaro.org> References: <20210913144300.1265143-1-linus.walleij@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: DENG Qingfang Use port isolation registers to configure bridge offloading. Tested on the D-Link DIR-685, switching between ports and sniffing ports to make sure no packets leak. Cc: Vladimir Oltean Cc: Mauri Sandberg Reviewed-by: Alvin Šipraga Reviewed-by: Florian Fainelli Signed-off-by: DENG Qingfang Signed-off-by: Linus Walleij --- ChangeLog v3->v4: - Fix a bug where I managed to mask off the CPU port from the ports we could access leading to numb bridge. - Reword some comments. ChangeLog v2->v3: - Parens around the (pmask) in the port isolation macro. - Do not exit join/leave functions on regmap failures, print an error and continue. - Clarify comments around the port in join/leave functions. ChangeLog v1->v2: - introduce RTL8366RB_PORT_ISO_PORTS() to shift the port mask into place so we are not confused by the enable bit. - Use this with dsa_user_ports() to isolate the CPU port from itself. --- drivers/net/dsa/rtl8366rb.c | 86 +++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c index a89093bc6c6a..b930050cfd1b 100644 --- a/drivers/net/dsa/rtl8366rb.c +++ b/drivers/net/dsa/rtl8366rb.c @@ -300,6 +300,13 @@ #define RTL8366RB_INTERRUPT_STATUS_REG 0x0442 #define RTL8366RB_NUM_INTERRUPT 14 /* 0..13 */ +/* Port isolation registers */ +#define RTL8366RB_PORT_ISO_BASE 0x0F08 +#define RTL8366RB_PORT_ISO(pnum) (RTL8366RB_PORT_ISO_BASE + (pnum)) +#define RTL8366RB_PORT_ISO_EN BIT(0) +#define RTL8366RB_PORT_ISO_PORTS_MASK GENMASK(7, 1) +#define RTL8366RB_PORT_ISO_PORTS(pmask) ((pmask) << 1) + /* bits 0..5 enable force when cleared */ #define RTL8366RB_MAC_FORCE_CTRL_REG 0x0F11 @@ -835,6 +842,21 @@ static int rtl8366rb_setup(struct dsa_switch *ds) if (ret) return ret; + /* Isolate all user ports so they can only send packets to itself and the CPU port */ + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) { + ret = regmap_write(smi->map, RTL8366RB_PORT_ISO(i), + RTL8366RB_PORT_ISO_PORTS(BIT(RTL8366RB_PORT_NUM_CPU)) | + RTL8366RB_PORT_ISO_EN); + if (ret) + return ret; + } + /* CPU port can send packets to all ports */ + ret = regmap_write(smi->map, RTL8366RB_PORT_ISO(RTL8366RB_PORT_NUM_CPU), + RTL8366RB_PORT_ISO_PORTS(dsa_user_ports(ds)) | + RTL8366RB_PORT_ISO_EN); + if (ret) + return ret; + /* Set up the "green ethernet" feature */ ret = rtl8366rb_jam_table(rtl8366rb_green_jam, ARRAY_SIZE(rtl8366rb_green_jam), smi, false); @@ -1127,6 +1149,68 @@ rtl8366rb_port_disable(struct dsa_switch *ds, int port) rb8366rb_set_port_led(smi, port, false); } +static int +rtl8366rb_port_bridge_join(struct dsa_switch *ds, int port, + struct net_device *bridge) +{ + struct realtek_smi *smi = ds->priv; + unsigned int port_bitmap = 0; + int ret, i; + + /* Loop over all other ports than the current one */ + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) { + /* Current port handled last */ + if (i == port) + continue; + /* Not on this bridge */ + if (dsa_to_port(ds, i)->bridge_dev != bridge) + continue; + /* Join this port to each other port on the bridge */ + ret = regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i), + RTL8366RB_PORT_ISO_PORTS(BIT(port)), + RTL8366RB_PORT_ISO_PORTS(BIT(port))); + if (ret) + dev_err(smi->dev, "failed to join port %d\n", port); + + port_bitmap |= BIT(i); + } + + /* Set the bits for the ports we can access */ + return regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port), + RTL8366RB_PORT_ISO_PORTS(port_bitmap), + RTL8366RB_PORT_ISO_PORTS(port_bitmap)); +} + +static void +rtl8366rb_port_bridge_leave(struct dsa_switch *ds, int port, + struct net_device *bridge) +{ + struct realtek_smi *smi = ds->priv; + unsigned int port_bitmap = 0; + int ret, i; + + /* Loop over all other ports than this one */ + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) { + /* Current port handled last */ + if (i == port) + continue; + /* Not on this bridge */ + if (dsa_to_port(ds, i)->bridge_dev != bridge) + continue; + /* Remove this port from any other port on the bridge */ + ret = regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i), + RTL8366RB_PORT_ISO_PORTS(BIT(port)), 0); + if (ret) + dev_err(smi->dev, "failed to leave port %d\n", port); + + port_bitmap |= BIT(i); + } + + /* Clear the bits for the ports we can not access, leave ourselves */ + regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port), + RTL8366RB_PORT_ISO_PORTS(port_bitmap), 0); +} + static int rtl8366rb_change_mtu(struct dsa_switch *ds, int port, int new_mtu) { struct realtek_smi *smi = ds->priv; @@ -1510,6 +1594,8 @@ static const struct dsa_switch_ops rtl8366rb_switch_ops = { .get_strings = rtl8366_get_strings, .get_ethtool_stats = rtl8366_get_ethtool_stats, .get_sset_count = rtl8366_get_sset_count, + .port_bridge_join = rtl8366rb_port_bridge_join, + .port_bridge_leave = rtl8366rb_port_bridge_leave, .port_vlan_filtering = rtl8366_vlan_filtering, .port_vlan_add = rtl8366_vlan_add, .port_vlan_del = rtl8366_vlan_del,