Re: [PATCH net-next v3 5/8] net: dsa: vsc73xx: Add vlan filtering

From: Paweł Dembicki
Date: Fri Sep 22 2023 - 10:26:18 EST

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Hi Vladimir,

wt., 12 wrz 2023 o 18:17 Vladimir Oltean <olteanv@xxxxxxxxx> napisał(a):
>
> On Tue, Sep 12, 2023 at 02:21:59PM +0200, Pawel Dembicki wrote:
> > This patch implements VLAN filtering for the vsc73xx driver.
> >
> > After starting VLAN filtering, the switch is reconfigured from QinQ to
> > a simple VLAN aware mode. This is required because VSC73XX chips do not
> > support inner VLAN tag filtering.
> >
> > Signed-off-by: Pawel Dembicki <paweldembicki@xxxxxxxxx>
> > ---
> > v3:
> > - reworked all vlan commits
> > - added storage variables for pvid and untagged vlans
> > - move length extender settings to port setup
> > - remove vlan table cleaning in wrong places
> > - note: dev_warn was keept because function 'vsc73xx_vlan_set_untagged'
> > and 'vsc73xx_vlan_set_pvid' are used later in tag implementation
> > v2:
> > - no changes done
> >
> > drivers/net/dsa/vitesse-vsc73xx-core.c | 425 ++++++++++++++++++++++++-
> > drivers/net/dsa/vitesse-vsc73xx.h | 2 +
> > 2 files changed, 425 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
> > index 541fbc195df1..d9a6eac1fcce 100644
> > --- a/drivers/net/dsa/vitesse-vsc73xx-core.c
> > +++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
> > @@ -21,14 +21,18 @@
> > #include <linux/of_mdio.h>
> > #include <linux/bitops.h>
> > #include <linux/if_bridge.h>
> > +#include <linux/if_vlan.h>
> > #include <linux/etherdevice.h>
> > #include <linux/gpio/consumer.h>
> > #include <linux/gpio/driver.h>
> > +#include <linux/dsa/8021q.h>
> > #include <linux/random.h>
> > #include <net/dsa.h>
> >
> > #include "vitesse-vsc73xx.h"
> >
> > +#define VSC73XX_IS_CONFIGURED 0x1
> > +
> > #define VSC73XX_BLOCK_MAC 0x1 /* Subblocks 0-4, 6 (CPU port) */
> > #define VSC73XX_BLOCK_ANALYZER 0x2 /* Only subblock 0 */
> > #define VSC73XX_BLOCK_MII 0x3 /* Subblocks 0 and 1 */
> > @@ -61,6 +65,8 @@
> > #define VSC73XX_CAT_DROP 0x6e
> > #define VSC73XX_CAT_PR_MISC_L2 0x6f
> > #define VSC73XX_CAT_PR_USR_PRIO 0x75
> > +#define VSC73XX_CAT_VLAN_MISC 0x79
> > +#define VSC73XX_CAT_PORT_VLAN 0x7a
> > #define VSC73XX_Q_MISC_CONF 0xdf
> >
> > /* MAC_CFG register bits */
> > @@ -121,6 +127,17 @@
> > #define VSC73XX_ADVPORTM_IO_LOOPBACK BIT(1)
> > #define VSC73XX_ADVPORTM_HOST_LOOPBACK BIT(0)
> >
> > +/* TXUPDCFG transmit modify setup bits */
> > +#define VSC73XX_TXUPDCFG_DSCP_REWR_MODE GENMASK(20, 19)
> > +#define VSC73XX_TXUPDCFG_DSCP_REWR_ENA BIT(18)
> > +#define VSC73XX_TXUPDCFG_TX_INT_TO_USRPRIO_ENA BIT(17)
> > +#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID GENMASK(15, 4)
> > +#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA BIT(3)
> > +#define VSC73XX_TXUPDCFG_TX_UPDATE_CRC_CPU_ENA BIT(1)
> > +#define VSC73XX_TXUPDCFG_TX_INSERT_TAG BIT(0)
> > +
> > +#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT 4
> > +
> > /* CAT_DROP categorizer frame dropping register bits */
> > #define VSC73XX_CAT_DROP_DROP_MC_SMAC_ENA BIT(6)
> > #define VSC73XX_CAT_DROP_FWD_CTRL_ENA BIT(4)
> > @@ -134,6 +151,15 @@
> > #define VSC73XX_Q_MISC_CONF_EARLY_TX_512 (1 << 1)
> > #define VSC73XX_Q_MISC_CONF_MAC_PAUSE_MODE BIT(0)
> >
> > +/* CAT_VLAN_MISC categorizer VLAN miscellaneous bits*/
> > +#define VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA BIT(8)
> > +#define VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA BIT(7)
> > +
> > +/* CAT_PORT_VLAN categorizer port VLAN*/
> > +#define VSC73XX_CAT_PORT_VLAN_VLAN_CFI BIT(15)
> > +#define VSC73XX_CAT_PORT_VLAN_VLAN_USR_PRIO GENMASK(14, 12)
> > +#define VSC73XX_CAT_PORT_VLAN_VLAN_VID GENMASK(11, 0)
> > +
> > /* Frame analyzer block 2 registers */
> > #define VSC73XX_STORMLIMIT 0x02
> > #define VSC73XX_ADVLEARN 0x03
> > @@ -188,7 +214,8 @@
> > #define VSC73XX_VLANACCESS_VLAN_MIRROR BIT(29)
> > #define VSC73XX_VLANACCESS_VLAN_SRC_CHECK BIT(28)
> > #define VSC73XX_VLANACCESS_VLAN_PORT_MASK GENMASK(9, 2)
> > -#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK GENMASK(2, 0)
> > +#define VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT 2
> > +#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK GENMASK(1, 0)
> > #define VSC73XX_VLANACCESS_VLAN_TBL_CMD_IDLE 0
> > #define VSC73XX_VLANACCESS_VLAN_TBL_CMD_READ_ENTRY 1
> > #define VSC73XX_VLANACCESS_VLAN_TBL_CMD_WRITE_ENTRY 2
> > @@ -343,6 +370,11 @@ static const struct vsc73xx_counter vsc73xx_tx_counters[] = {
> > { 29, "TxQoSClass3" }, /* non-standard counter */
> > };
> >
> > +enum vsc73xx_port_vlan_conf {
> > + VSC73XX_VLAN_FILTER,
> > + VSC73XX_VLAN_IGNORE,
> > +};
> > +
> > int vsc73xx_is_addr_valid(u8 block, u8 subblock)
> > {
> > switch (block) {
> > @@ -563,7 +595,7 @@ static enum dsa_tag_protocol vsc73xx_get_tag_protocol(struct dsa_switch *ds,
> > static int vsc73xx_setup(struct dsa_switch *ds)
> > {
> > struct vsc73xx *vsc = ds->priv;
> > - int i;
> > + int i, ret;
>
> ../drivers/net/dsa/vitesse-vsc73xx-core.c:598:9: warning: unused variable 'ret' [-Wunused-variable]
> int i, ret;
> ^
>
> >
> > dev_info(vsc->dev, "set up the switch\n");
> >
> > @@ -623,6 +655,9 @@ static int vsc73xx_setup(struct dsa_switch *ds)
> > vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
> > VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
> > VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
> > + /* Ingess VLAN reception mask (table 145) */
> > + vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANMASK,
> > + 0x5f);
> > /* IP multicast flood mask (table 144) */
> > vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_IFLODMSK,
> > 0xff);
> > @@ -1031,8 +1066,387 @@ static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
> > return 9600 - ETH_HLEN - ETH_FCS_LEN;
> > }
> >
> > +static int vsc73xx_wait_for_vlan_table_cmd(struct vsc73xx *vsc)
> > +{
> > + int ret, err;
> > + u32 val;
> > +
> > + ret = read_poll_timeout(vsc73xx_read, err,
> > + err < 0 || ((val & VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK) ==
> > + VSC73XX_VLANACCESS_VLAN_TBL_CMD_IDLE),
> > + 1000, 10000, false, vsc, VSC73XX_BLOCK_ANALYZER,
> > + 0, VSC73XX_VLANACCESS, &val);
> > + if (ret)
> > + return ret;
> > + return err;
> > +}
> > +
> > +static int
> > +vsc73xx_read_vlan_table_entry(struct vsc73xx *vsc, u16 vid, u8 *portmap)
> > +{
> > + u32 val;
> > + int ret;
> > +
> > + vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANTIDX, vid);
> > + ret = vsc73xx_wait_for_vlan_table_cmd(vsc);
> > + if (ret)
> > + return ret;
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS,
> > + VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK,
> > + VSC73XX_VLANACCESS_VLAN_TBL_CMD_READ_ENTRY);
> > + ret = vsc73xx_wait_for_vlan_table_cmd(vsc);
> > + if (ret)
> > + return ret;
> > + vsc73xx_read(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS, &val);
> > + *portmap = (val & VSC73XX_VLANACCESS_VLAN_PORT_MASK) >>
> > + VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT;
> > + return 0;
> > +}
> > +
> > +static int
> > +vsc73xx_write_vlan_table_entry(struct vsc73xx *vsc, u16 vid, u8 portmap)
> > +{
> > + int ret;
> > +
> > + vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANTIDX, vid);
> > + ret = vsc73xx_wait_for_vlan_table_cmd(vsc);
> > + if (ret)
> > + return ret;
> > +
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS,
> > + VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK |
> > + VSC73XX_VLANACCESS_VLAN_SRC_CHECK |
> > + VSC73XX_VLANACCESS_VLAN_PORT_MASK,
> > + VSC73XX_VLANACCESS_VLAN_TBL_CMD_WRITE_ENTRY |
> > + VSC73XX_VLANACCESS_VLAN_SRC_CHECK |
> > + (portmap <<
> > + VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT));
> > +
> > + return vsc73xx_wait_for_vlan_table_cmd(vsc);
> > +}
> > +
> > +static int
> > +vsc73xx_update_vlan_table(struct vsc73xx *vsc, int port, u16 vid, bool set)
> > +{
> > + u8 portmap;
> > + int ret;
> > +
> > + ret = vsc73xx_read_vlan_table_entry(vsc, vid, &portmap);
> > + if (ret)
> > + return ret;
> > +
> > + if (set)
> > + portmap |= BIT(port) | BIT(CPU_PORT);
> > + else
> > + portmap &= ~BIT(port);
> > +
> > + if (portmap == BIT(CPU_PORT))
> > + portmap = 0;
>
> Why did you need to do this? To my knowledge, the DSA framework code
> will decide when to remove VLANs from the CPU port.
>

I will fix it.

> > +
> > + return vsc73xx_write_vlan_table_entry(vsc, vid, portmap);
> > +}
> > +
> > +static void
> > +vsc73xx_set_vlan_conf(struct vsc73xx *vsc, int port,
> > + enum vsc73xx_port_vlan_conf port_vlan_conf)
> > +{
> > + if (port_vlan_conf == VSC73XX_VLAN_IGNORE) {
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_CAT_VLAN_MISC,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA);
>
> IMO this, and all the other places that write the same registers from 2
> branches, would look less clutered like this:
>
> u32 val;
>
> val = (port_vlan_conf == VSC73XX_VLAN_IGNORE) ?
> VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA : 0;
>
> vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_VLAN_MISC,
> VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA, val);
>
> val = ...
>
> Otherwise, the larger the branches become, the harder it gets to see
> what's common and what's different.
>
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_CAT_VLAN_MISC,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_INSERT_TAG, 0);
> > + } else {
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_CAT_VLAN_MISC,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA,
> > + 0);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_CAT_VLAN_MISC,
> > + VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA, 0);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
> > + VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_INSERT_TAG,
> > + VSC73XX_TXUPDCFG_TX_INSERT_TAG);
> > + }
> > +}
> > +
> > +static int
> > +vsc73xx_vlan_change_untagged(struct vsc73xx *vsc, int port, u16 vid, bool set)
> > +{
> > + u32 val = set ? VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA : 0;
> > +
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA, val);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID,
> > + (vid << VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT) &
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID);
> > + return 0;
> > +}
> > +
> > +static int
> > +vsc73xx_vlan_change_pvid(struct vsc73xx *vsc, int port, u16 vid, bool set)
>
> Would it simplify callers to add a "bool operate_on_storage" argument here,
> and absorb that logic? The callers could look like this, notice how there is
> less code duplication between the "if" and "else" branches.
>

I will rework it.

> static int vsc73xx_vlan_set_pvid(struct dsa_switch *ds, int port, u16 vid,
> bool tag_8021q_vlan)
> {
> struct dsa_port *dp = dsa_to_port(ds, port);
> struct vsc73xx *vsc = ds->priv;
> bool operate_on_storage;
> u16 existing_pvid;
> bool had_pvid;
>
> operate_on_storage = vsc73xx_tag_8021q_active(dp) ^ tag_8021q_vlan;
>
> had_pvid = vsc73xx_port_get_pvid(vsc, port, &existing_pvid,
> &operate_on_storage);
> if (had_pvid && existing_pvid != vid) {
> dev_warn(vsc->dev,
> "Port %d can have only one pvid! Now is: %d.\n",
> port, existing_pvid);
> return -EOPNOTSUPP;
> }
>
> return vsc73xx_vlan_change_pvid(vsc, port, vid, true, operate_on_storage);
> }
>
> > +{
> > + u32 val = set ? 0 : VSC73XX_CAT_DROP_UNTAGGED_ENA;
> > +
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
> > + VSC73XX_CAT_DROP_UNTAGGED_ENA, val);
> > +
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_PORT_VLAN,
> > + VSC73XX_CAT_PORT_VLAN_VLAN_VID,
> > + vid & VSC73XX_CAT_PORT_VLAN_VLAN_VID);
> > + return 0;
> > +}
> > +
> > +static int vsc73xx_vlan_port_is_pvid(struct vsc73xx *vsc, int port, u16 *vid)
>
> I believe it would look better if this would return bool, and if it had
> a shorter name (vsc73xx_port_get_pvid).
>
> > +{
> > + u32 val;
> > +
> > + vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP, &val);
> > + if (val & VSC73XX_CAT_DROP_UNTAGGED_ENA)
> > + return 0;
> > +
> > + vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_PORT_VLAN, &val);
> > + *vid = val & VSC73XX_CAT_PORT_VLAN_VLAN_VID;
> > +
> > + return VSC73XX_IS_CONFIGURED;
> > +}
> > +
> > +static int vsc73xx_vlan_port_is_untagged(struct vsc73xx *vsc, int port, u16 *vid)
> > +{
> > + u32 val;
> > +
> > + vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG, &val);
> > + if (!(val & VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA))
> > + return 0;
> > +
> > + vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
> > + &val);
>
> Don't need to read the same register twice.
>
> > + *vid = (val & VSC73XX_TXUPDCFG_TX_UNTAGGED_VID) >>
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT;
> > +
> > + return VSC73XX_IS_CONFIGURED;
> > +}
> > +
> > +static int vsc73xx_vlan_set_untagged(struct dsa_switch *ds, int port, u16 vid,
> > + bool port_vlan)
> > +{
> > + struct vsc73xx *vsc = ds->priv;
> > + u16 vlan_no = 0;
> > +
> > + if (dsa_port_is_vlan_filtering(dsa_to_port(ds, port)) ^ port_vlan) {
>
> I think it would be valuable for readability to create a helper function named:
>
> static bool vsc73xx_tag_8021q_active(struct dsa_port *dp)
> {
> return !dsa_port_is_vlan_filtering(dp);
> }
>
> and then, to rename "port_vlan" to "!tag_8021q_vlan". It would make it
> clearer as to what the checks are about.
>
> if (vsc73xx_tag_8021q_active(dp) ^ tag_8021q_vlan) {
> // update cached storage
> } else {
> // update hardware
> }
>
> > + if (vsc->untagged_storage[port] < VLAN_N_VID &&
> > + !vid_is_dsa_8021q(vsc->untagged_storage[port]) &&
> > + !vid_is_dsa_8021q(vid) &&
>
> The problem here which led to these vid_is_dsa_8021q() checks is that
> dsa_switch_tag_8021q_vlan_add() sets all flags on user ports to
> BRIDGE_VLAN_INFO_UNTAGGED | BRIDGE_VLAN_INFO_PVID, and you can't offload
> those, correct?

In my case, the major problem with tag8021q vlans is
"dsa_tag_8021q_bridge_join" function:
"dsa_port_tag_8021q_vlan_add" is called before "dsa_port_tag_8021q_vlan_del".
I must disable pvid/untagged checking, because it will always fail. I
let kernel do the job,
it keeps only one untagged/pvid per port after "dsa_tag_8021q_bridge_join".

> But when the port is VSC73XX_VLAN_IGNORE mode (and
> tag_8021q is active), VSC73XX_TXUPDCFG_TX_INSERT_TAG is 0, and thus,
> *all* VLANs are egress-untagged VLANs, correct?
>
> If that is the case, why do you call vsc73xx_vlan_set_untagged() in the
> first place, for tag_8021q VLANs, if you don't rely on the port's native
> VLAN for egress untagging?
>
> > + vsc->untagged_storage[port] != vid) {
> > + dev_warn(vsc->dev,
> > + "Port %d can have only one untagged vid! Now is: %d.\n",
> > + port, vsc->untagged_storage[port]);
> > + return -EOPNOTSUPP;
> > + }
> > + vsc->untagged_storage[port] = vid;
> > + } else {
> > + if (vsc73xx_vlan_port_is_untagged(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED &&
> > + !vid_is_dsa_8021q(vlan_no) && !vid_is_dsa_8021q(vid) && vlan_no != vid) {
> > + dev_warn(vsc->dev,
> > + "Port %d can have only one untagged vid! Now is: %d.\n",
> > + port, vlan_no);
> > + return -EOPNOTSUPP;
> > + }
> > + return vsc73xx_vlan_change_untagged(vsc, port, vid, 1);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int vsc73xx_vlan_set_pvid(struct dsa_switch *ds, int port, u16 vid,
> > + bool port_vlan)
> > +{
> > + struct dsa_port *dsa_port = dsa_to_port(ds, port);
> > + struct vsc73xx *vsc = ds->priv;
> > + u16 vlan_no;
> > +
> > + if (!dsa_port)
> > + return -EINVAL;
>
> Why is this check here?
>

Unnecessary defensive programming.

> > +
> > + if (dsa_port_is_vlan_filtering(dsa_port) ^ port_vlan) {
> > + if (vsc->pvid_storage[port] < VLAN_N_VID &&
> > + !vid_is_dsa_8021q(vsc->pvid_storage[port]) &&
> > + !vid_is_dsa_8021q(vid) && vsc->pvid_storage[port] != vid) {
>
> What are the vid_is_dsa_8021q() checks for?

The same reason as the "untagged" case.

>
> > + dev_warn(vsc->dev,
> > + "Port %d can have only one pvid! Now is: %d.\n",
> > + port, vsc->pvid_storage[port]);
> > + return -EOPNOTSUPP;
> > + }
> > + vsc->pvid_storage[port] = vid;
> > + } else {
> > + if (vsc73xx_vlan_port_is_pvid(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED &&
> > + !vid_is_dsa_8021q(vlan_no) && !vid_is_dsa_8021q(vid) &&
> > + vlan_no != vid) {
> > + dev_warn(vsc->dev,
> > + "Port %d can have only one pvid! Now is: %d.\n",
> > + port, vlan_no);
> > + return -EOPNOTSUPP;
> > + }
> > + return vsc73xx_vlan_change_pvid(vsc, port, vid, 1);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int
> > +vsc73xx_port_vlan_filtering(struct dsa_switch *ds, int port,
> > + bool vlan_filtering, struct netlink_ext_ack *extack)
>
> A comment would be good which states that the flipping between the
> hardware and the storage values relies on the fact that vsc73xx_port_vlan_filtering()
> only gets called on actual changes to vlan_filtering, and thus, to
> vsc73xx_tag_8021q_active(). So, we know for sure that what is in storage
> needs to go to hardware, and what is in hardware needs to go to storage.
>
> It's an interesting implementation for sure.
>

Thank you.

> > +{
> > + struct vsc73xx *vsc = ds->priv;
> > + bool store_untagged = false;
> > + bool store_pvid = false;
>
> nit: replace the 2 spaces before the "=" with a single one.
>
> > + u16 vlan_no;
> > +
> > + if (vlan_filtering)
> > + vsc73xx_set_vlan_conf(vsc, port, VSC73XX_VLAN_FILTER);
> > + else
> > + vsc73xx_set_vlan_conf(vsc, port, VSC73XX_VLAN_IGNORE);
> > +
> > + if (vsc73xx_vlan_port_is_pvid(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED)
> > + store_pvid = true;
> > +
> > + if (vsc->pvid_storage[port] < VLAN_N_VID)
> > + vsc73xx_vlan_change_pvid(vsc, port, vsc->pvid_storage[port], true);
> > + else
> > + vsc73xx_vlan_change_pvid(vsc, port, 0, false);
> > +
> > + vsc->pvid_storage[port] = store_pvid ? vlan_no : VLAN_N_VID;
> > +
> > + if (vsc73xx_vlan_port_is_untagged(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED)
> > + store_untagged = true;
> > +
> > + if (vsc->untagged_storage[port] < VLAN_N_VID)
> > + vsc73xx_vlan_change_untagged(vsc, port, vsc->untagged_storage[port], true);
> > + else
> > + vsc73xx_vlan_change_untagged(vsc, port, 0, false);
> > +
> > + vsc->untagged_storage[port] = store_untagged ? vlan_no : VLAN_N_VID;
> > +
> > + return 0;
> > +}
> > +
> > +static int vsc73xx_port_vlan_add(struct dsa_switch *ds, int port,
> > + const struct switchdev_obj_port_vlan *vlan,
> > + struct netlink_ext_ack *extack)
> > +{
> > + bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
> > + bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
> > + struct vsc73xx *vsc = ds->priv;
> > + u16 vlan_no;
> > + int ret;
> > +
> > + /* Be sure to deny alterations to the configuration done by tag_8021q.
> > + */
> > + if (vid_is_dsa_8021q(vlan->vid)) {
> > + NL_SET_ERR_MSG_MOD(extack,
> > + "Range 3072-4095 reserved for dsa_8021q operation");
> > + return -EBUSY;
> > + }
> > +
> > + if (port != CPU_PORT) {
> > + if (untagged) {
> > + ret = vsc73xx_vlan_set_untagged(ds, port, vlan->vid, true);
> > + if (ret)
> > + return ret;
> > + } else {
> > + if (vsc73xx_vlan_port_is_untagged(vsc, port, &vlan_no)
> > + == VSC73XX_IS_CONFIGURED &&
> > + vlan_no == vlan->vid)
> > + vsc73xx_vlan_change_untagged(vsc, port, 0, false);
> > + else if (vsc->untagged_storage[port] == vlan->vid)
> > + vsc->untagged_storage[port] = VLAN_N_VID;
> > + }
> > + if (pvid) {
> > + ret = vsc73xx_vlan_set_pvid(ds, port, vlan->vid, true);
> > + if (ret)
> > + return ret;
> > + } else {
> > + if (vsc73xx_vlan_port_is_pvid(vsc, port, &vlan_no)
> > + == VSC73XX_IS_CONFIGURED &&
> > + vlan_no == vlan->vid)
> > + vsc73xx_vlan_change_pvid(vsc, port, 0, false);
> > + else if (vsc->pvid_storage[port] == vlan->vid)
> > + vsc->pvid_storage[port] = VLAN_N_VID;
> > + }
> > + }
> > +
> > + return vsc73xx_update_vlan_table(vsc, port, vlan->vid, 1);
>
> last argument is bool, so pass true or false (here and everywhere else)
>
> > +}
> > +
> > +static int vsc73xx_port_vlan_del(struct dsa_switch *ds, int port,
> > + const struct switchdev_obj_port_vlan *vlan)
> > +{
> > + struct vsc73xx *vsc = ds->priv;
> > + u16 vlan_no;
> > + int ret;
> > +
> > + ret = vsc73xx_update_vlan_table(vsc, port, vlan->vid, 0);
> > + if (ret)
> > + return ret;
> > +
> > + if (vsc73xx_vlan_port_is_untagged(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED &&
> > + vlan_no == vlan->vid)
> > + vsc73xx_vlan_change_untagged(vsc, port, 0, false);
> > + else if (vsc->untagged_storage[port] == vlan->vid)
> > + vsc->untagged_storage[port] = VLAN_N_VID;
> > +
> > + if (vsc73xx_vlan_port_is_pvid(vsc, port, &vlan_no) == VSC73XX_IS_CONFIGURED &&
> > + vlan_no == vlan->vid)
> > + vsc73xx_vlan_change_pvid(vsc, port, 0, false);
> > + else if (vsc->pvid_storage[port] == vlan->vid)
> > + vsc->pvid_storage[port] = VLAN_N_VID;
> > +
> > + return 0;
> > +}
> > +
> > static int vsc73xx_port_setup(struct dsa_switch *ds, int port)
> > {
> > + struct vsc73xx *vsc = ds->priv;
> > + int ret, i;
> > +
> > + /* Those bits are responsible for MTU only. Kernel take care about MTU,
> > + * let's enable +8 bytes frame length unconditionally.
> > + */
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_MAC_CFG,
> > + VSC73XX_MAC_CFG_VLAN_AWR | VSC73XX_MAC_CFG_VLAN_DBLAWR,
> > + VSC73XX_MAC_CFG_VLAN_AWR | VSC73XX_MAC_CFG_VLAN_DBLAWR);
> > +
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
> > + VSC73XX_CAT_DROP_TAGGED_ENA, 0);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
> > + VSC73XX_CAT_DROP_UNTAGGED_ENA,
> > + VSC73XX_CAT_DROP_UNTAGGED_ENA);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA, 0);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
> > + VSC73XX_TXUPDCFG_TX_UNTAGGED_VID, 0);
> > + vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_PORT_VLAN,
> > + VSC73XX_CAT_PORT_VLAN_VLAN_VID, 0);
> > +
> > + if (port == CPU_PORT)
> > + vsc73xx_set_vlan_conf(vsc, port, VSC73XX_VLAN_FILTER);
> > + else
> > + vsc73xx_set_vlan_conf(vsc, port, VSC73XX_VLAN_IGNORE);
> > +
> > + for (i = 0; i <= VLAN_N_VID; i++) {
>
> VLAN_N_VID is 4096, so i <= VLAN_N_VID must be a mistake?
>

Yeep.

> > + ret = vsc73xx_update_vlan_table(vsc, port, i, 0);
> > + if (ret)
> > + return ret;
> > + }
>
> Also, could you write an expedited version of this, which is not called
> from ds->ops->port_setup() but from ds->ops->setup()? It is wasteful to
> traverse the VLAN table for each port, when we know from the get go that
> we need to clear all ports.
>

I'll rework it in setup.

> > +
> > /* Configure forward map to CPU <-> port only */
> > if (port == CPU_PORT)
> > vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK &
> > @@ -1041,6 +1455,10 @@ static int vsc73xx_port_setup(struct dsa_switch *ds, int port)
> > vsc->forward_map[port] = VSC73XX_SRCMASKS_PORTS_MASK &
> > BIT(CPU_PORT);
> >
> > + /* Set storage values out of range*/
>
> Nit: Space after "*/" (there are a few other places left which have
> this style issue)
>
> > + vsc->pvid_storage[port] = VLAN_N_VID;
> > + vsc->untagged_storage[port] = VLAN_N_VID;
> > +
> > return 0;
> > }
> >
> > @@ -1098,6 +1516,9 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
> > .port_change_mtu = vsc73xx_change_mtu,
> > .port_max_mtu = vsc73xx_get_max_mtu,
> > .port_stp_state_set = vsc73xx_port_stp_state_set,
> > + .port_vlan_filtering = vsc73xx_port_vlan_filtering,
> > + .port_vlan_add = vsc73xx_port_vlan_add,
> > + .port_vlan_del = vsc73xx_port_vlan_del,
> > };
> >
> > static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
> > diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
> > index 224e284a5573..b7614dd7d0eb 100644
> > --- a/drivers/net/dsa/vitesse-vsc73xx.h
> > +++ b/drivers/net/dsa/vitesse-vsc73xx.h
> > @@ -30,6 +30,8 @@ struct vsc73xx {
> > const struct vsc73xx_ops *ops;
> > void *priv;
> > u8 forward_map[VSC73XX_MAX_NUM_PORTS];
> > + u16 pvid_storage[VSC73XX_MAX_NUM_PORTS];
> > + u16 untagged_storage[VSC73XX_MAX_NUM_PORTS];
> > };
> >
> > struct vsc73xx_ops {
> > --
> > 2.34.1
> >
>

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