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Date: Wed, 13 Jan 2021 09:01:19 -0500 (EST)
From: Gilles Doffe <gilles.doffe@...oirfairelinux.com>
To: netdev@...r.kernel.org
Cc: Woojung Huh <woojung.huh@...rochip.com>,
UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 1/6] net: dsa: ksz: fix FID management
----- Le 13 Jan 21, à 13:45, Gilles Doffe gilles.doffe@...oirfairelinux.com a écrit :
> The FID (Filter ID) is a 7 bits field used to link the VLAN table
> to the static and dynamic mac address tables.
> Until now the KSZ8795 driver could only add one VLAN as the FID was
> always set to 1.
> This commit allows setting a FID for each new active VLAN.
> The FID list is stored in a static table dynamically allocated from
> ks8795_fid structure.
> Each newly activated VLAN is associated to the next available FID.
> Only the VLAN 0 is not added to the list as it is a special VLAN.
> As it has a special meaning, see IEEE 802.1q.
> When a VLAN is no more used, the associated FID table entry is reset
> to 0.
>
> Signed-off-by: Gilles DOFFE <gilles.doffe@...oirfairelinux.com>
> ---
> drivers/net/dsa/microchip/ksz8795.c | 59 +++++++++++++++++++++++--
> drivers/net/dsa/microchip/ksz8795_reg.h | 1 +
> drivers/net/dsa/microchip/ksz_common.h | 1 +
> 3 files changed, 57 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/dsa/microchip/ksz8795.c
> b/drivers/net/dsa/microchip/ksz8795.c
> index c973db101b72..6962ba4ee125 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -648,7 +648,7 @@ static enum dsa_tag_protocol ksz8795_get_tag_protocol(struct
> dsa_switch *ds,
> int port,
> enum dsa_tag_protocol mp)
> {
> - return DSA_TAG_PROTO_KSZ8795;
> + return DSA_TAG_PROTO_NONE;
This is an oversight, will be removed in V2.
> }
>
> static void ksz8795_get_strings(struct dsa_switch *ds, int port,
> @@ -796,6 +796,41 @@ static int ksz8795_port_vlan_filtering(struct dsa_switch
> *ds, int port,
> return 0;
> }
>
> +static void ksz8795_del_fid(u16 *ksz_fid_table, u16 vid)
> +{
> + u8 i = 0;
> +
> + if (!ksz_fid_table)
> + return;
> +
> + for (i = 0; i < VLAN_TABLE_FID_SIZE; i++) {
> + if (ksz_fid_table[i] == vid) {
> + ksz_fid_table[i] = 0;
> + break;
> + }
> + }
> +}
> +
> +static int ksz8795_get_next_fid(u16 *ksz_fid_table, u16 vid, u8 *fid)
> +{
> + u8 i = 0;
> + int ret = -EOVERFLOW;
> +
> + if (!ksz_fid_table)
> + return ret;
> +
> + for (i = 0; i < VLAN_TABLE_FID_SIZE; i++) {
> + if (!ksz_fid_table[i]) {
> + ksz_fid_table[i] = vid;
> + *fid = i;
> + ret = 0;
> + break;
> + }
> + }
> +
> + return ret;
> +}
> +
> static void ksz8795_port_vlan_add(struct dsa_switch *ds, int port,
> const struct switchdev_obj_port_vlan *vlan)
> {
> @@ -803,17 +838,24 @@ static void ksz8795_port_vlan_add(struct dsa_switch *ds,
> int port,
> struct ksz_device *dev = ds->priv;
> u16 data, vid, new_pvid = 0;
> u8 fid, member, valid;
> + int ret;
>
> ksz_port_cfg(dev, port, P_TAG_CTRL, PORT_REMOVE_TAG, untagged);
>
> for (vid = vlan->vid_begin; vid <= vlan->vid_end; vid++) {
> + if (vid == 0)
> + continue;
> +
> ksz8795_r_vlan_table(dev, vid, &data);
> ksz8795_from_vlan(data, &fid, &member, &valid);
>
> /* First time to setup the VLAN entry. */
> if (!valid) {
> - /* Need to find a way to map VID to FID. */
> - fid = 1;
> + ret = ksz8795_get_next_fid(dev->ksz_fid_table, vid, &fid);
> + if (ret) {
> + dev_err(ds->dev, "Switch FID table is full, cannot add");
> + return;
> + }
> valid = 1;
> }
> member |= BIT(port);
> @@ -855,7 +897,7 @@ static int ksz8795_port_vlan_del(struct dsa_switch *ds, int
> port,
>
> /* Invalidate the entry if no more member. */
> if (!member) {
> - fid = 0;
> + ksz8795_del_fid(dev->ksz_fid_table, vid);
> valid = 0;
> }
>
> @@ -1087,6 +1129,9 @@ static int ksz8795_setup(struct dsa_switch *ds)
> for (i = 0; i < (dev->num_vlans / 4); i++)
> ksz8795_r_vlan_entries(dev, i);
>
> + /* Assign first FID to VLAN 1 and always return FID=0 for this vlan */
> + dev->ksz_fid_table[0] = 1;
> +
> /* Setup STP address for STP operation. */
> memset(&alu, 0, sizeof(alu));
> ether_addr_copy(alu.mac, eth_stp_addr);
> @@ -1261,6 +1306,12 @@ static int ksz8795_switch_init(struct ksz_device *dev)
> /* set the real number of ports */
> dev->ds->num_ports = dev->port_cnt;
>
> + dev->ksz_fid_table = devm_kzalloc(dev->dev,
> + VLAN_TABLE_FID_SIZE * sizeof(u16),
> + GFP_KERNEL);
> + if (!dev->ksz_fid_table)
> + return -ENOMEM;
> +
> return 0;
> }
>
> diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h
> b/drivers/net/dsa/microchip/ksz8795_reg.h
> index 40372047d40d..fe4c4f7fdd47 100644
> --- a/drivers/net/dsa/microchip/ksz8795_reg.h
> +++ b/drivers/net/dsa/microchip/ksz8795_reg.h
> @@ -915,6 +915,7 @@
> */
>
> #define VLAN_TABLE_FID 0x007F
> +#define VLAN_TABLE_FID_SIZE 128
> #define VLAN_TABLE_MEMBERSHIP 0x0F80
> #define VLAN_TABLE_VALID 0x1000
>
> diff --git a/drivers/net/dsa/microchip/ksz_common.h
> b/drivers/net/dsa/microchip/ksz_common.h
> index 720f22275c84..44e97c55c2da 100644
> --- a/drivers/net/dsa/microchip/ksz_common.h
> +++ b/drivers/net/dsa/microchip/ksz_common.h
> @@ -77,6 +77,7 @@ struct ksz_device {
> bool synclko_125;
>
> struct vlan_table *vlan_cache;
> + u16 *ksz_fid_table;
>
> struct ksz_port *ports;
> struct delayed_work mib_read;
> --
> 2.25.1
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