port_r_mib_cnt(9)

🌸 port_r_mib_cnt 🌸

okay so this is a page from the Kernel API Manual, and it's literally about one tiny lil function that reads a MIB counter for a port 💅 yes bestie, it's a kernel function, we're in driver land now, buckle up 🎀

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✨ NAME ✨

port_r_mib_cnt — read MIB counter

like… that's it. that's the whole name. it reads a MIB counter. iconic, concise, no notes 🫶

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💖 SYNOPSIS 💖

void port_r_mib_cnt (struct ksz_hw *hw , int port , u16 addr , u64 *cnt
);

ok so it returns void, meaning it hands you nothing back, the whole point is the cnt pointer it fills in for you. main character energy is the buffer, honestly 👑

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🦋 ARGUMENTS 🦋

• hw — the hardware instance. this is your switch/hardware thing, the big one ✨
• port — the port index. which port we're talking about, fr fr.
• addr — the address of the counter. where the counter lives.
• cnt — buffer to store the counter. this is the output spot, it's where the answer ends up 🌸

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🌈 DESCRIPTION 🌈

so this routine reads a MIB counter of the port ✨ that's the vibe. it goes and grabs the counter value for you.

but here's the important part, bestie — hardware interrupts are disabled while this happens, and that's on purpose: it's to minimize corruption of read data 😭 like, no cap, you do not want your counter read getting messed up mid-read, so interrupts get blocked for a sec. lowkey a big deal, highkey necessary 🫶

⚠️ heads up: interrupts are disabled during the read. this is intentional — it minimizes corruption of read data. don't come for it, it's doing its job 💅

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👑 SEE ALSO 👑

Kernel file ./drivers/net/ethernet/micrel/ksz884x.c 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), 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_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(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), 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), 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), 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), 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), 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_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), dev_monitor(9), netdev_init(9)

like… that's a lot of friends, bestie, but every single one of them is listed and we're not skipping a single one 💀✨ iykyk

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ok that's the whole page, mwah 💋 this lil guy lives in ./drivers/net/ethernet/micrel, and this edition is dated October 2026 🗓️💖 go read your counters, bestie, and remember: interrupts stay off during the read. periodt. 🎀