stmmac_change_mtu(9)

💖 stmmac_change_mtu(9) 💖

okay so bestie, welcome to the Kernel API Manual page for stmmac_change_mtu — yes, the entry point for changing the MTU size for the device. it's giving short-and-sweet kernel API energy, and we're gonna get you comfy with it. no cap. 🫶

🌸 NAME 🌸

stmmac_change_mtu — entry point to change MTU size for the device. periodt. 💅

✨ SYNOPSIS ✨

int stmmac_change_mtu (struct net_device *dev , int new_mtu );

🎀 ARGUMENTS 🎀

• dev — device pointer. literally the device pointer, bestie.
• new_mtu — the new MTU size for the device. that's the whole assignment. 🎯

🦋 DESCRIPTION 🦋

okay so the Maximum Transfer Unit (MTU) is used by the network layer to drive packet transmission. Ethernet has an MTU of 1500 octets (ETH_DATA_LEN) — iconic, classic, the standard. This value can be changed with ifconfig.

Return value tea: 0 on success and an appropriate (-)ve integer as defined in errno.h file on failure. so yeah, success says 0, failure gives you that appropriate (-)ve errno.h situation. 😭

💅 SEE ALSO 💅

the whole stmmac friend group is linked here, bestie — every single ref, no skips:

• Kernel file: ./drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
• stmmac_set_clk_tx_rate(9)
• stmmac_axi_blen_to_mask(9)
• stmmac_verify_args(9)
• stmmac_disable_all_queues(9)
• stmmac_enable_all_queues(9)
• stmmac_rx_dirty(9)
• stmmac_try_to_start_sw_lpi(9)
• stmmac_stop_sw_lpi(9)
• stmmac_eee_ctrl_timer(9)
• stmmac_hwtstamp_set(9)
• stmmac_hwtstamp_get(9)
• stmmac_init_tstamp_counter(9)
• stmmac_init_timestamping(9)
• stmmac_mac_flow_ctrl(9)
• stmmac_check_pcs_mode(9)
• stmmac_init_phy(9)
• stmmac_clear_rx_descriptors(9)
• stmmac_clear_tx_descriptors(9)
• stmmac_clear_descriptors(9)
• stmmac_init_rx_buffers(9)
• stmmac_free_rx_buffer(9)
• stmmac_free_tx_buffer(9)
• dma_free_rx_skbufs(9)
• dma_free_rx_xskbufs(9)
• __init_dma_rx_desc_rings(9)
• __init_dma_tx_desc_rings(9)
• init_dma_desc_rings(9)
• dma_free_tx_skbufs(9)
• stmmac_free_tx_skbufs(9)
• __free_dma_rx_desc_resources(9)
• __free_dma_tx_desc_resources(9)
• __alloc_dma_rx_desc_resources(9)
• __alloc_dma_tx_desc_resources(9)
• alloc_dma_desc_resources(9)
• free_dma_desc_resources(9)
• stmmac_mac_enable_rx_queues(9)
• stmmac_start_rx_dma(9)
• stmmac_start_tx_dma(9)
• stmmac_stop_rx_dma(9)
• stmmac_stop_tx_dma(9)
• stmmac_start_all_dma(9)
• stmmac_stop_all_dma(9)
• stmmac_dma_operation_mode(9)
• stmmac_tx_clean(9)
• stmmac_tx_err(9)
• stmmac_set_dma_operation_mode(9)
• stmmac_dma_interrupt(9)
• stmmac_mmc_setup(9)
• stmmac_get_hw_features(9)
• stmmac_check_ether_addr(9)
• stmmac_init_dma_engine(9)
• stmmac_tx_timer(9)
• stmmac_init_coalesce(9)
• stmmac_set_tx_queue_weight(9)
• stmmac_configure_cbs(9)
• stmmac_rx_queue_dma_chan_map(9)
• stmmac_mac_config_rx_queues_prio(9)
• stmmac_mac_config_tx_queues_prio(9)
• stmmac_mac_config_rx_queues_routing(9)
• stmmac_mtl_configuration(9)
• stmmac_hw_setup(9)
• stmmac_setup_dma_desc(9)
• __stmmac_open(9)
• stmmac_release(9)
• stmmac_tso_allocator(9)
• stmmac_tso_xmit(9)
• stmmac_has_ip_ethertype(9)
• stmmac_xmit(9)
• stmmac_rx_refill(9)
• stmmac_rx(9)
• stmmac_tx_timeout(9)
• stmmac_set_rx_mode(9)
• stmmac_interrupt(9)
• stmmac_ioctl(9)
• stmmac_hw_init(9)
• stmmac_dvr_probe(9)
• stmmac_dvr_remove(9)
• stmmac_suspend(9)
• stmmac_reset_queues_param(9)
• stmmac_resume(9)

mwah 💋 — this page was brought to you by source/version ./drivers/net/ethernet/stmicro... and the date October 2026, all wrapped up as stmmac_change_mtu(9). slay, go change that MTU responsibly. 🎀✨