t4_set_reg_field(9)

💅 t4_set_reg_field(9) — like, the Kernel API Manual page you actually want to read

okay bestie, welcome to the <pink>Kernel API Manual</pink> ✨ the star of today's episode is t4_set_reg_field(9) — the tiny little function that pokes one field of a register and minds its own business. she's small, she's focused, she's giving surgical precision energy 🎀 let's get into it.

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✨ NAME ✨

t4_set_reg_field — set a register field to a value 🔥 that's it. that's the whole gig. she sets a field, she's a setter, she's booked and busy.

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🦋 SYNOPSIS 🦋

void t4_set_reg_field (struct adapter *adapter , unsigned int addr , u32
mask , u32 val );

no cap, that's the whole signature. four things in, nothing out — it's a void girlie, she does not return your texts 💀

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🌸 ARGUMENTS 🌸

• adapter — the adapter to program 💖 like, this is which adapter you're messing with. your main character.
• addr — the register address 📍 where exactly in the register map we're living today.
• mask — specifies the portion of the register to modify 🎀 the lil spotlight that says "only these bits, queen, don't touch the rest."
• val — the new value for the register field ⭐ the actual new content going in there.

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👑 DESCRIPTION 👑

so what does she do? listen: it sets a register field specified by the supplied mask to the given val 💅 that's it. that's the tea. mask says where, val says what, and she handles it. lowkey iconic, highkey useful, 10/10 no notes 🫶

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🌈 SEE ALSO 🌈

okay so this is the part where the manpage goes feral with cross-references and honestly? relatable. here's the whole squad, and yes, we are listing every single one 🧚

first up, the source file itself: ./drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

and then the friend group 💜

t4_wait_op_done_val(9), t4_read_indirect(9), t4_write_indirect(9), t4_record_mbox(9), t4_wr_mbox_meat_timeout(9), t4_memory_rw_init(9), t4_memory_update_win(9), t4_memory_rw_residual(9), t4_memory_rw(9), t4_get_regs_len(9), t4_get_regs(9), t4_eeprom_ptov(9), t4_seeprom_wp(9), t4_get_raw_vpd_params(9), t4_get_vpd_params(9), t4_get_pfres(9), sf1_read(9), sf1_write(9), flash_wait_op(9), t4_read_flash(9), t4_write_flash(9)

the version-reporting girlies 📋 t4_get_fw_version(9), t4_get_bs_version(9), t4_get_tp_version(9), t4_get_exprom_version(9), t4_get_vpd_version(9), t4_get_scfg_version(9), t4_get_version_info(9), t4_dump_version_info(9), t4_check_fw_version(9), t4_flash_erase_sectors(9), t4_flash_cfg_addr(9), t4_load_fw(9), t4_phy_fw_ver(9), t4_load_phy_fw(9), t4_fwcache(9), fwcaps16_to_caps32(9), fwcaps32_to_caps16(9)

link + interrupts + RSS gang 🔥 t4_link_acaps(9), t4_link_l1cfg_core(9), t4_restart_aneg(9), t4_handle_intr_status(9), t4_slow_intr_handler(9), t4_intr_enable(9), t4_intr_disable(9), t4_config_rss_range(9), t4_config_glbl_rss(9), t4_config_vi_rss(9), t4_read_rss(9)

the TP / indirect-access crowd 🌀 t4_tp_fw_ldst_rw(9), t4_tp_indirect_rw(9), t4_tp_pio_read(9), t4_tp_pio_write(9), t4_tp_tm_pio_read(9), t4_tp_mib_read(9), t4_read_rss_key(9), t4_write_rss_key(9), t4_read_rss_pf_config(9), t4_read_rss_vf_config(9), t4_read_rss_pf_map(9), t4_read_rss_pf_mask(9)

stats besties 📊 t4_tp_get_tcp_stats(9), t4_tp_get_err_stats(9), t4_tp_get_cpl_stats(9), t4_tp_get_rdma_stats(9), t4_get_fcoe_stats(9), t4_get_usm_stats(9), t4_read_mtu_tbl(9), t4_read_cong_tbl(9), t4_tp_wr_bits_indirect(9), init_cong_ctrl(9), t4_load_mtus(9), t4_get_chan_txrate(9), t4_set_trace_filter(9), t4_get_trace_filter(9), t4_pmtx_get_stats(9), t4_pmrx_get_stats(9)

maps + port stuff 🗺️ compute_mps_bg_map(9), t4_get_mps_bg_map(9), t4_get_tp_e2c_map(9), t4_get_tp_ch_map(9), t4_get_port_type_description(9), t4_get_port_stats_offset(9), t4_get_port_stats(9), t4_get_lb_stats(9), t4_mdio_rd(9), t4_mdio_wr(9)

SGE + firmware handshake era 💀 t4_sge_decode_idma_state(9), t4_sge_ctxt_flush(9), t4_read_sge_dbqtimers(9), t4_fw_hello(9), t4_fw_bye(9), t4_early_init(9), t4_fw_reset(9), t4_fw_halt(9), t4_fw_restart(9), t4_fw_upgrade(9), t4_fl_pkt_align(9), t4_fixup_host_params(9), t4_fw_initialize(9), t4_query_params_rw(9), t4_set_params_timeout(9), t4_set_params(9), t4_cfg_pfvf(9)

VI / MAC / filter crew 🎀 t4_alloc_vi(9), t4_free_vi(9), t4_set_rxmode(9), t4_free_encap_mac_filt(9), t4_free_raw_mac_filt(9), t4_alloc_encap_mac_filt(9), t4_alloc_raw_mac_filt(9), t4_alloc_mac_filt(9), t4_free_mac_filt(9), t4_change_mac(9), t4_set_addr_hash(9), t4_enable_vi_params(9), t4_enable_vi(9), t4_enable_pi_params(9), t4_identify_port(9), t4_iq_stop(9), t4_iq_free(9), t4_eth_eq_free(9), t4_ctrl_eq_free(9), t4_ofld_eq_free(9)

link-status + adapter setup squad 🌟 t4_link_down_rc_str(9), fwcap_to_fwspeed(9), lstatus_to_fwcap(9), t4_handle_get_port_info(9), t4_update_port_info(9), t4_get_link_params(9), t4_handle_fw_rpl(9), init_link_config(9), t4_prep_adapter(9), t4_shutdown_adapter(9), t4_bar2_sge_qregs(9), t4_init_devlog_params(9), t4_init_sge_params(9), t4_init_tp_params(9), t4_filter_field_shift(9), t4_init_portinfo(9)

CIM / LA / monitor babes 🦋 t4_read_cimq_cfg(9), t4_read_cim_ibq(9), t4_read_cim_obq(9), t4_cim_read(9), t4_cim_write(9), t4_cim_read_la(9), t4_tp_read_la(9), t4_idma_monitor_init(9), t4_idma_monitor(9), t4_load_cfg(9), t4_set_vf_mac_acl(9), t4_read_pace_tbl(9), t4_get_tx_sched(9), t4_sge_ctxt_rd_bd(9)

and the last lil row of the group chat 💖 t4_i2c_rd(9), t4_set_vlan_acl(9), modify_device_id(9), t4_load_boot(9), t4_flash_bootcfg_addr(9)

fr fr that's all of them. i counted. don't come for me. 🙈

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and that's the page, bestie 🫶 this gem lives under ./drivers/net/ethernet/chelsio... (you know the rest, the path was right up there ✨) and it was dated October 2026 — so yes, she's recent, she's fresh, she's got main character energy 👑 go forth and set those register fields, but like... only the masked bits. periodt 💅🎀