Mauro Carvalho Chehab | 8470f18 | 2020-05-01 16:44:54 +0200 | [diff] [blame] | 1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | |
| 3 | ====================================================== |
| 4 | Texas Instruments CPSW switchdev based ethernet driver |
| 5 | ====================================================== |
| 6 | |
| 7 | :Version: 2.0 |
| 8 | |
| 9 | Port renaming |
| 10 | ============= |
| 11 | |
| 12 | On older udev versions renaming of ethX to swXpY will not be automatically |
| 13 | supported |
| 14 | |
| 15 | In order to rename via udev:: |
| 16 | |
| 17 | ip -d link show dev sw0p1 | grep switchid |
| 18 | |
| 19 | SUBSYSTEM=="net", ACTION=="add", ATTR{phys_switch_id}==<switchid>, \ |
| 20 | ATTR{phys_port_name}!="", NAME="sw0$attr{phys_port_name}" |
| 21 | |
| 22 | |
| 23 | Dual mac mode |
| 24 | ============= |
| 25 | |
| 26 | - The new (cpsw_new.c) driver is operating in dual-emac mode by default, thus |
| 27 | working as 2 individual network interfaces. Main differences from legacy CPSW |
| 28 | driver are: |
| 29 | |
| 30 | - optimized promiscuous mode: The P0_UNI_FLOOD (both ports) is enabled in |
| 31 | addition to ALLMULTI (current port) instead of ALE_BYPASS. |
| 32 | So, Ports in promiscuous mode will keep possibility of mcast and vlan |
| 33 | filtering, which is provides significant benefits when ports are joined |
| 34 | to the same bridge, but without enabling "switch" mode, or to different |
| 35 | bridges. |
| 36 | - learning disabled on ports as it make not too much sense for |
| 37 | segregated ports - no forwarding in HW. |
| 38 | - enabled basic support for devlink. |
| 39 | |
| 40 | :: |
| 41 | |
| 42 | devlink dev show |
| 43 | platform/48484000.switch |
| 44 | |
| 45 | devlink dev param show |
| 46 | platform/48484000.switch: |
| 47 | name switch_mode type driver-specific |
| 48 | values: |
| 49 | cmode runtime value false |
| 50 | name ale_bypass type driver-specific |
| 51 | values: |
| 52 | cmode runtime value false |
| 53 | |
| 54 | Devlink configuration parameters |
| 55 | ================================ |
| 56 | |
| 57 | See Documentation/networking/devlink/ti-cpsw-switch.rst |
| 58 | |
| 59 | Bridging in dual mac mode |
| 60 | ========================= |
| 61 | |
| 62 | The dual_mac mode requires two vids to be reserved for internal purposes, |
| 63 | which, by default, equal CPSW Port numbers. As result, bridge has to be |
| 64 | configured in vlan unaware mode or default_pvid has to be adjusted:: |
| 65 | |
| 66 | ip link add name br0 type bridge |
| 67 | ip link set dev br0 type bridge vlan_filtering 0 |
| 68 | echo 0 > /sys/class/net/br0/bridge/default_pvid |
| 69 | ip link set dev sw0p1 master br0 |
| 70 | ip link set dev sw0p2 master br0 |
| 71 | |
| 72 | or:: |
| 73 | |
| 74 | ip link add name br0 type bridge |
| 75 | ip link set dev br0 type bridge vlan_filtering 0 |
| 76 | echo 100 > /sys/class/net/br0/bridge/default_pvid |
| 77 | ip link set dev br0 type bridge vlan_filtering 1 |
| 78 | ip link set dev sw0p1 master br0 |
| 79 | ip link set dev sw0p2 master br0 |
| 80 | |
| 81 | Enabling "switch" |
| 82 | ================= |
| 83 | |
| 84 | The Switch mode can be enabled by configuring devlink driver parameter |
| 85 | "switch_mode" to 1/true:: |
| 86 | |
| 87 | devlink dev param set platform/48484000.switch \ |
| 88 | name switch_mode value 1 cmode runtime |
| 89 | |
| 90 | This can be done regardless of the state of Port's netdev devices - UP/DOWN, but |
| 91 | Port's netdev devices have to be in UP before joining to the bridge to avoid |
| 92 | overwriting of bridge configuration as CPSW switch driver copletly reloads its |
| 93 | configuration when first Port changes its state to UP. |
| 94 | |
| 95 | When the both interfaces joined the bridge - CPSW switch driver will enable |
| 96 | marking packets with offload_fwd_mark flag unless "ale_bypass=0" |
| 97 | |
| 98 | All configuration is implemented via switchdev API. |
| 99 | |
| 100 | Bridge setup |
| 101 | ============ |
| 102 | |
| 103 | :: |
| 104 | |
| 105 | devlink dev param set platform/48484000.switch \ |
| 106 | name switch_mode value 1 cmode runtime |
| 107 | |
| 108 | ip link add name br0 type bridge |
| 109 | ip link set dev br0 type bridge ageing_time 1000 |
| 110 | ip link set dev sw0p1 up |
| 111 | ip link set dev sw0p2 up |
| 112 | ip link set dev sw0p1 master br0 |
| 113 | ip link set dev sw0p2 master br0 |
| 114 | |
| 115 | [*] bridge vlan add dev br0 vid 1 pvid untagged self |
| 116 | |
| 117 | [*] if vlan_filtering=1. where default_pvid=1 |
| 118 | |
| 119 | Note. Steps [*] are mandatory. |
| 120 | |
| 121 | |
| 122 | On/off STP |
| 123 | ========== |
| 124 | |
| 125 | :: |
| 126 | |
| 127 | ip link set dev BRDEV type bridge stp_state 1/0 |
| 128 | |
| 129 | VLAN configuration |
| 130 | ================== |
| 131 | |
| 132 | :: |
| 133 | |
| 134 | bridge vlan add dev br0 vid 1 pvid untagged self <---- add cpu port to VLAN 1 |
| 135 | |
| 136 | Note. This step is mandatory for bridge/default_pvid. |
| 137 | |
| 138 | Add extra VLANs |
| 139 | =============== |
| 140 | |
| 141 | 1. untagged:: |
| 142 | |
| 143 | bridge vlan add dev sw0p1 vid 100 pvid untagged master |
| 144 | bridge vlan add dev sw0p2 vid 100 pvid untagged master |
| 145 | bridge vlan add dev br0 vid 100 pvid untagged self <---- Add cpu port to VLAN100 |
| 146 | |
| 147 | 2. tagged:: |
| 148 | |
| 149 | bridge vlan add dev sw0p1 vid 100 master |
| 150 | bridge vlan add dev sw0p2 vid 100 master |
| 151 | bridge vlan add dev br0 vid 100 pvid tagged self <---- Add cpu port to VLAN100 |
| 152 | |
| 153 | FDBs |
| 154 | ---- |
| 155 | |
| 156 | FDBs are automatically added on the appropriate switch port upon detection |
| 157 | |
| 158 | Manually adding FDBs:: |
| 159 | |
| 160 | bridge fdb add aa:bb:cc:dd:ee:ff dev sw0p1 master vlan 100 |
| 161 | bridge fdb add aa:bb:cc:dd:ee:fe dev sw0p2 master <---- Add on all VLANs |
| 162 | |
| 163 | MDBs |
| 164 | ---- |
| 165 | |
| 166 | MDBs are automatically added on the appropriate switch port upon detection |
| 167 | |
| 168 | Manually adding MDBs:: |
| 169 | |
| 170 | bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent vid 100 |
| 171 | bridge mdb add dev br0 port sw0p1 grp 239.1.1.1 permanent <---- Add on all VLANs |
| 172 | |
| 173 | Multicast flooding |
| 174 | ================== |
| 175 | CPU port mcast_flooding is always on |
| 176 | |
| 177 | Turning flooding on/off on swithch ports: |
| 178 | bridge link set dev sw0p1 mcast_flood on/off |
| 179 | |
| 180 | Access and Trunk port |
| 181 | ===================== |
| 182 | |
| 183 | :: |
| 184 | |
| 185 | bridge vlan add dev sw0p1 vid 100 pvid untagged master |
| 186 | bridge vlan add dev sw0p2 vid 100 master |
| 187 | |
| 188 | |
| 189 | bridge vlan add dev br0 vid 100 self |
| 190 | ip link add link br0 name br0.100 type vlan id 100 |
| 191 | |
| 192 | Note. Setting PVID on Bridge device itself working only for |
| 193 | default VLAN (default_pvid). |
| 194 | |
| 195 | NFS |
| 196 | === |
| 197 | |
| 198 | The only way for NFS to work is by chrooting to a minimal environment when |
| 199 | switch configuration that will affect connectivity is needed. |
| 200 | Assuming you are booting NFS with eth1 interface(the script is hacky and |
| 201 | it's just there to prove NFS is doable). |
| 202 | |
| 203 | setup.sh:: |
| 204 | |
| 205 | #!/bin/sh |
| 206 | mkdir proc |
| 207 | mount -t proc none /proc |
| 208 | ifconfig br0 > /dev/null |
| 209 | if [ $? -ne 0 ]; then |
| 210 | echo "Setting up bridge" |
| 211 | ip link add name br0 type bridge |
| 212 | ip link set dev br0 type bridge ageing_time 1000 |
| 213 | ip link set dev br0 type bridge vlan_filtering 1 |
| 214 | |
| 215 | ip link set eth1 down |
| 216 | ip link set eth1 name sw0p1 |
| 217 | ip link set dev sw0p1 up |
| 218 | ip link set dev sw0p2 up |
| 219 | ip link set dev sw0p2 master br0 |
| 220 | ip link set dev sw0p1 master br0 |
| 221 | bridge vlan add dev br0 vid 1 pvid untagged self |
| 222 | ifconfig sw0p1 0.0.0.0 |
| 223 | udhchc -i br0 |
| 224 | fi |
| 225 | umount /proc |
| 226 | |
| 227 | run_nfs.sh::: |
| 228 | |
| 229 | #!/bin/sh |
| 230 | mkdir /tmp/root/bin -p |
| 231 | mkdir /tmp/root/lib -p |
| 232 | |
| 233 | cp -r /lib/ /tmp/root/ |
| 234 | cp -r /bin/ /tmp/root/ |
| 235 | cp /sbin/ip /tmp/root/bin |
| 236 | cp /sbin/bridge /tmp/root/bin |
| 237 | cp /sbin/ifconfig /tmp/root/bin |
| 238 | cp /sbin/udhcpc /tmp/root/bin |
| 239 | cp /path/to/setup.sh /tmp/root/bin |
| 240 | chroot /tmp/root/ busybox sh /bin/setup.sh |
| 241 | |
| 242 | run ./run_nfs.sh |