ice_set_wb_on_itr(9)

✨ ice_set_wb_on_itr(9) ✨

okay bestie, so this is a page from the Kernel API Manual and it's literally about telling the hardware to write stuff back. stay with me, it's gonna slay 💅

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🎀 NAME 🎀

ice_set_wb_on_itr — sets WB_ON_ITR for this q_vector. that's it, that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

void ice_set_wb_on_itr (struct ice_q_vector *q_vector );

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💖 ARGUMENTS 💖

• q_vector — the q_vector we're setting WB_ON_ITR on. literally the main character of this function 🫶

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🧚 DESCRIPTION 🧚

okay so picture this: we have to tell the hardware to write back completed descriptors even when interrupts are disabled. like, no cap, it's mandatory.

here's the tea though — descriptors will get written back on cache line boundaries without WB_ON_ITR enabled, no problem. but if we don't enable WB_ON_ITR, descriptors may not get written back if they don't fill a whole cache line. they just sit there waiting until the next interrupt 😭 like hello??

so this function sets the write-back frequency to whatever was set previously for the ITR indices. lowkey important: it also sets the INTENA_MSK bit to make sure the hardware knows we aren't meddling with the INTENA_M bit. we're being respectful, we're not touching that 🙈

bestie fr fr: set the INTENA_MSK bit. do NOT forget it. the hardware needs to know we're not out here meddling with INTENA_M.

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👑 SEE ALSO 👑

• Kernel file ./drivers/net/ethernet/intel/ice/ice_txrx.c
• ice_prgm_fdir_fltr(9)
• ice_unmap_and_free_tx_buf(9)
• ice_clean_tstamp_ring(9)
• ice_free_tstamp_ring(9)
• ice_free_tx_tstamp_ring(9)
• ice_clean_tx_ring(9)
• ice_free_tx_ring(9)
• ice_clean_tx_irq(9)
• ice_alloc_tstamp_ring(9)
• ice_setup_tstamp_ring(9)
• ice_alloc_setup_tstamp_ring(9)
• ice_setup_tx_ring(9)
• ice_clean_rx_ring(9)
• ice_free_rx_ring(9)
• ice_setup_rx_ring(9)
• ice_run_xdp(9)
• ice_xmit_xdp_ring(9)
• ice_xdp_xmit(9)
• ice_init_ctrl_rx_descs(9)
• ice_alloc_rx_bufs(9)
• ice_clean_ctrl_rx_irq(9)
• ice_clean_rx_irq(9)
• ice_net_dim(9)
• ice_buildreg_itr(9)
• ice_enable_interrupt(9)
• ice_napi_poll(9)
• __ice_maybe_stop_tx(9)
• ice_maybe_stop_tx(9)
• ice_tx_map(9)
• ice_tx_csum(9)
• ice_tx_prepare_vlan_flags(9)
• ice_tso(9)
• ice_txd_use_count(9)
• ice_xmit_desc_count(9)
• __ice_chk_linearize(9)
• ice_chk_linearize(9)
• ice_tstamp(9)
• ice_xmit_frame_ring(9)
• ice_start_xmit(9)
• ice_get_dscp_up(9)
• ice_clean_ctrl_tx_irq(9)

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and that's the whole page bb 💜 go forth and set that WB_ON_ITR, you're gonna eat 🍓

sign-off moment: this lil masterpiece lives in ./drivers/net/ethernet/intel/ice and it's dated October 2026 — iconic, timeless, periodt ⭐