sw_cfg(9)

💅 sw_cfg — set switch register bits

Okay bestie, welcome to the Kernel API Manual, section 9, where we poke at switch registers. This is sw_cfg(9) and it's lowkey the little toggle switch of the whole ksz884x situation 🎀

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✨ SYNOPSIS ✨

void sw_cfg (struct ksz_hw *hw , u32 addr , u16 bits , int set );

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🫶 ARGUMENTS 🫶

• hw — the hardware instance. like, the actual chip we're talking to, bestie 💖
• addr — the address of the switch register. this is where we're going 👑
• bits — the data bits to set. the little guys we're flipping ✨
• set — the flag saying whether those bits get set or not. yes it's a flag called set inside a function whose whole job is setting. iconic naming ngl 💀

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🌸 DESCRIPTION 🌸

So what does it do? This function sets or resets the specified bits of the switch register. That's it, that's the whole vibe. You point at a register with addr, hand it bits, and set decides whether we're turning those bits on or back off 🦋

no cap, it's a one-job function and it does its one job. main character energy 🎀

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🦋 SEE ALSO 🦋

Everything is connected, iykyk. Start with the kernel file ./drivers/net/ethernet/micrel/ksz884x.c and then go absolutely feral in this list:

struct ksz_hw_desc(9), struct ksz_sw_desc(9), struct ksz_dma_buf(9), struct ksz_desc(9), struct ksz_desc_info(9), struct ksz_mac_table(9), struct ksz_vlan_table(9), struct ksz_port_mib(9), struct ksz_port_cfg(9), struct ksz_switch(9), struct ksz_port_info(9), struct ksz_hw(9), struct ksz_port(9), struct ksz_timer_info(9), struct ksz_shared_mem(9), struct ksz_counter_info(9), struct dev_info(9), struct dev_priv(9) 💜

Then the hardware/switch crew: hw_turn_on_intr(9), hw_block_intr(9), sw_r_table(9), sw_w_table_64(9), sw_w_sta_mac_table(9), sw_r_vlan_table(9), port_r_mib_cnt(9), port_r_mib_pkt(9), port_r_cnt(9), port_init_cnt(9), port_cfg(9), port_r8(9), port_r16(9), port_w16(9), sw_chk(9), sw_cfg_broad_storm(9), sw_get_broad_storm(9), sw_dis_broad_storm(9), sw_ena_broad_storm(9), sw_init_broad_storm(9), hw_cfg_broad_storm(9), sw_dis_prio_rate(9), sw_init_prio_rate(9), sw_dis_diffserv(9), sw_dis_802_1p(9), sw_cfg_replace_null_vid(9), sw_cfg_replace_vid(9), sw_cfg_port_based(9), sw_dis_multi_queue(9), sw_init_prio(9), port_get_def_vid(9), sw_init_vlan(9), sw_cfg_port_base_vlan(9), sw_set_addr(9), sw_set_global_ctrl(9), port_set_stp_state(9), sw_clr_sta_mac_table(9), sw_init_stp(9), sw_block_addr(9) 🌈

PHY + EEPROM + link speed era: hw_r_phy(9), hw_w_phy(9), eeprom_read(9), eeprom_write(9), port_get_link_speed(9), port_set_link_speed(9), port_force_link_speed(9) ⭐

Wake-on-LAN corner, we love her: hw_chk_wol_pme_status(9), hw_clr_wol_pme_status(9), hw_cfg_wol_pme(9), hw_cfg_wol(9), hw_set_wol_frame(9), hw_add_wol_arp(9), hw_add_wol_bcast(9), hw_add_wol_mcast(9), hw_add_wol_ucast(9), hw_enable_wol(9) 💫

The core hardware ops: hw_init(9), hw_reset(9), hw_setup(9), hw_setup_intr(9), hw_set_desc_base(9), hw_start_rx(9), hw_stop_rx(9), hw_start_tx(9), hw_stop_tx(9), hw_disable(9), hw_enable(9), hw_alloc_pkt(9), hw_send_pkt(9), hw_set_addr(9), hw_read_addr(9), hw_clr_multicast(9), hw_set_grp_addr(9), hw_set_multicast(9), hw_set_promiscuous(9), sw_enable(9), sw_setup(9) 🔥

Timers, descriptors and memory besties: ksz_start_timer(9), ksz_stop_timer(9), ksz_alloc_soft_desc(9), ksz_alloc_desc(9), free_dma_buf(9), ksz_init_rx_buffers(9), ksz_alloc_mem(9), ksz_free_desc(9), ksz_free_buffers(9), ksz_free_mem(9) 💖

Transmit path girlies: send_packet(9), transmit_cleanup(9), tx_done(9), netdev_tx(9), netdev_tx_timeout(9), netdev_intr(9), netdev_close(9), netdev_open(9) 🌸

netdev + ethtool squad, assemble: netdev_query_statistics(9), netdev_set_mac_address(9), netdev_set_rx_mode(9), netdev_ioctl(9), mdio_read(9), mdio_write(9), netdev_get_link_ksettings(9), netdev_set_link_ksettings(9), netdev_nway_reset(9), netdev_get_link(9), netdev_get_drvinfo(9), netdev_get_regs_len(9), netdev_get_regs(9), netdev_get_wol(9), netdev_set_wol(9), netdev_get_msglevel(9), netdev_set_msglevel(9), netdev_get_eeprom_len(9), netdev_get_eeprom(9), netdev_set_eeprom(9), netdev_get_pauseparam(9), netdev_set_pauseparam(9), netdev_get_ringparam(9), netdev_get_strings(9), netdev_get_sset_count(9), netdev_get_ethtool_stats(9), netdev_set_features(9) 🧚

And the last two absolutely not forgotten: dev_monitor(9), netdev_init(9). periodt 💅

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That's the whole page bestie, go forth and flip some bits 🍓

so yeah — this one came out of ./drivers/net/ethernet/micrel, dated October 2026, and it's filed under sw_cfg(9). slay, bye 👋💜