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SubjectRe: [PATCH net-next v2 08/10] net: dsa: lan9303: Added ALR/fdb/mdb handling
Hi Egil

> +/* This function will wait a while until mask & reg == value */
> +/* Otherwise, return timeout */
> +static int lan9303_csr_reg_wait(struct lan9303 *chip, int regno,
> + int mask, char value)
> +{
> + int i;
> +
> + for (i = 0; i < 0x1000; i++) {
> + u32 reg;
> +
> + lan9303_read_switch_reg(chip, regno, &reg);
> + if ((reg & mask) == value)
> + return 0;
> + }
> + return -ETIMEDOUT;

Busy looping is probably not a good idea. Can you add a usleep()?

> +}
> +
> +static int _lan9303_alr_make_entry_raw(struct lan9303 *chip, u32 dat0, u32 dat1)

What does the _ indicate. I could understand having it when you have
lan9303_alr_make_entry_raw() call _lan9303_alr_make_entry_raw() after
taking a lock, but i don't see anything like that here.

> +{
> + lan9303_write_switch_reg(
> + chip, LAN9303_SWE_ALR_WR_DAT_0, dat0);
> + lan9303_write_switch_reg(
> + chip, LAN9303_SWE_ALR_WR_DAT_1, dat1);
> + lan9303_write_switch_reg(
> + chip, LAN9303_SWE_ALR_CMD, ALR_CMD_MAKE_ENTRY);
> + lan9303_csr_reg_wait(
> + chip, LAN9303_SWE_ALR_CMD_STS, ALR_STS_MAKE_PEND, 0);
> + lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
> + return 0;
> +}
> +
> +typedef void alr_loop_cb_t(
> + struct lan9303 *chip, u32 dat0, u32 dat1, int portmap, void *ctx);
> +
> +static void lan9303_alr_loop(struct lan9303 *chip, alr_loop_cb_t *cb, void *ctx)
> +{
> + int i;
> +
> + lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, ALR_CMD_GET_FIRST);
> + lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
> +
> + for (i = 1; i < LAN9303_NUM_ALR_RECORDS; i++) {
> + u32 dat0, dat1;
> + int alrport, portmap;
> +
> + lan9303_read_switch_reg(chip, LAN9303_SWE_ALR_RD_DAT_0, &dat0);
> + lan9303_read_switch_reg(chip, LAN9303_SWE_ALR_RD_DAT_1, &dat1);
> + if (dat1 & ALR_DAT1_END_OF_TABL)
> + break;
> +
> + alrport = (dat1 & ALR_DAT1_PORT_MASK) >> ALR_DAT1_PORT_BITOFFS;
> + portmap = alrport_2_portmap[alrport];
> +
> + cb(chip, dat0, dat1, portmap, ctx);
> +
> + lan9303_write_switch_reg(
> + chip, LAN9303_SWE_ALR_CMD, ALR_CMD_GET_NEXT);
> + lan9303_write_switch_reg(chip, LAN9303_SWE_ALR_CMD, 0);
> + }
> +}
> +
> +/* ALR: lan9303_alr_loop callback functions */
> +
> +static void _alr_reg_to_mac(u32 dat0, u32 dat1, u8 mac[6])
> +{
> + mac[0] = (dat0 >> 0) & 0xff;
> + mac[1] = (dat0 >> 8) & 0xff;
> + mac[2] = (dat0 >> 16) & 0xff;
> + mac[3] = (dat0 >> 24) & 0xff;
> + mac[4] = (dat1 >> 0) & 0xff;
> + mac[5] = (dat1 >> 8) & 0xff;
> +}
> +
> +/* Clear learned (non-static) entry on given port */
> +static void alr_loop_cb_del_port_learned(
> + struct lan9303 *chip, u32 dat0, u32 dat1, int portmap, void *ctx)
> +{
> + int *port = ctx;
> +
> + if (((BIT(*port) & portmap) == 0) || (dat1 & ALR_DAT1_STATIC))
> + return;
> +
> + /* learned entries has only one port, we can just delete */
> + dat1 &= ~ALR_DAT1_VALID; /* delete entry */
> + _lan9303_alr_make_entry_raw(chip, dat0, dat1);
> +}
> +
> +struct port_fdb_dump_ctx {
> + int port;
> + struct switchdev_obj_port_fdb *fdb;
> + switchdev_obj_dump_cb_t *cb;
> +};
> +
> +static void alr_loop_cb_fdb_port_dump(
> + struct lan9303 *chip, u32 dat0, u32 dat1, int portmap, void *ctx)
> +{
> + struct port_fdb_dump_ctx *dump_ctx = ctx;
> + struct switchdev_obj_port_fdb *fdb = dump_ctx->fdb;
> + u8 mac[ETH_ALEN];
> +
> + if ((BIT(dump_ctx->port) & portmap) == 0)
> + return;
> +
> + _alr_reg_to_mac(dat0, dat1, mac);
> + ether_addr_copy(fdb->addr, mac);
> + fdb->vid = 0;
> + fdb->ndm_state = (dat1 & ALR_DAT1_STATIC) ?
> + NUD_NOARP : NUD_REACHABLE;
> + dump_ctx->cb(&fdb->obj);
> +}
> +
> +/* ALR: Add/modify/delete ALR entries */
> +
> +/* Set a static ALR entry. Delete entry if port_map is zero */
> +static void _lan9303_alr_set_entry(struct lan9303 *chip, const u8 *mac,
> + u8 port_map, bool stp_override)
> +{
> + u32 dat0, dat1, alr_port;
> +
> + dat1 = ALR_DAT1_STATIC;
> + if (port_map)
> + dat1 |= ALR_DAT1_VALID; /* otherwise no ports: delete entry */
> + if (stp_override)
> + dat1 |= ALR_DAT1_AGE_OVERRID;
> +
> + alr_port = portmap_2_alrport[port_map & 7];
> + dat1 &= ~ALR_DAT1_PORT_MASK;
> + dat1 |= alr_port << ALR_DAT1_PORT_BITOFFS;
> +
> + dat0 = 0;
> + dat0 |= (mac[0] << 0);
> + dat0 |= (mac[1] << 8);
> + dat0 |= (mac[2] << 16);
> + dat0 |= (mac[3] << 24);
> +
> + dat1 |= (mac[4] << 0);
> + dat1 |= (mac[5] << 8);
> +
> + dev_dbg(chip->dev, "%s %pM %d %08x %08x\n",
> + __func__, mac, port_map, dat0, dat1);
> + _lan9303_alr_make_entry_raw(chip, dat0, dat1);
> +}
> +
> +/* Add port to static ALR entry, create new static entry if needed */
> +static int lan9303_alr_add_port(struct lan9303 *chip, const u8 *mac,
> + int port, bool stp_override)
> +{
> + struct lan9303_alr_cache_entry *entr = lan9303_alr_cache_find_mac(
> + chip, mac);

A long line like this should be split into a declaration and an
assignment.

> +
> + if (!entr) { /*New entry */
> + entr = lan9303_alr_cache_find_free(chip);
> + if (!entr)
> + return -ENOSPC;
> + ether_addr_copy(entr->mac_addr, mac);
> + }
> + entr->port_map |= BIT(port);
> + entr->stp_override = stp_override;
> + _lan9303_alr_set_entry(chip, mac, entr->port_map, stp_override);
> + return 0;
> +}
> +
> +/* Delete static port from ALR entry, delete entry if last port */
> +static int lan9303_alr_del_port(struct lan9303 *chip, const u8 *mac,
> + int port)
> +{
> + struct lan9303_alr_cache_entry *entr = lan9303_alr_cache_find_mac(
> + chip, mac);
> +
> + if (!entr) { /* no static entry found */
> + /* Should we delete any learned entry?
> + * _lan9303_alr_set_entry(chip, mac, 0, false);
> + */
> + return 0;
> + }
> + entr->port_map &= ~BIT(port); /* zero means its free again */
> + if (entr->port_map == 0)
> + eth_zero_addr(&entr->port_map);
> + _lan9303_alr_set_entry(chip, mac, entr->port_map, entr->stp_override);
> + return 0;
> +}
> +
> +/* --------------------- Various chip setup ----------------------*/
> static int lan9303_disable_packet_processing(struct lan9303 *chip,
> unsigned int port)
> {
> @@ -729,6 +968,14 @@ static int lan9303_setup(struct dsa_switch *ds)
> return 0;
> }
>
> +static int lan9303_set_addr(struct dsa_switch *ds, u8 *addr)
> +{
> + struct lan9303 *chip = ds->priv;
> +
> + lan9303_alr_add_port(chip, addr, 0, false);
> + return 0;
> +}
> +

I would probably make this a separate patch.

Andrew

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