STRUCT DPNI_TAILDROP(9)

🎀 struct dpni_taildrop(9) 🎀

okay bestie, so this is a page from the Kernel API Manual and it's literally all about one little struct called dpni_taildrop — the structure representing the taildrop. it's giving "small but important" energy and honestly? we love a focused icon. ✨

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🌸 NAME 🌸

struct dpni_taildrop — the structure representing the taildrop. that's it, that's the whole vibe. 🫶

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💅 SYNOPSIS 💅

here's the shape of it, exact as ever, no cap:

struct dpni_taildrop {
    char enable;
    enum dpni_congestion_unit units;
    u32 threshold;
 };

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🦋 Members 🦋

okay so let's go through the squad, one member at a time 💖

• enable — tells you whether the taildrop is active or not. is it on? is it off? this little char knows. 👑
• units — this one says what the unit of THRESHOLD is, type enum dpni_congestion_unit. here's the tea though: queue taildrop only supports byte units, so this field is literally ignored and assumed = 0 if CONGESTION_POINT is 0. ngl, it's a decoration in that case 🙈
• threshold — the threshold value itself, a u32, measured in the units identified by the UNITS field. and listen — value 0 cannot be used as a valid taildrop threshold, so THRESHOLD must be > 0 if the taildrop is enabled. that's a hard rule, fr fr, no 0 shenanigans allowed 💀

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⭐ SEE ALSO ⭐

the whole extended friend group, and yes we're tagging everyone because they all slay in their own way 🌈

• the kernel file: ./drivers/net/ethernet/freescale/dpaa2/dpni.h — like, go read the source bestie, it's iconic 💜
• DPNI_MAX_TC(9)
• DPNI_MAX_DPBP(9)
• DPNI_ALL_TCS(9)
• DPNI_ALL_TC_FLOWS(9)
• DPNI_NEW_FLOW_ID(9)
• DPNI_OPT_TX_FRM_RELEASE(9)
• DPNI_OPT_NO_MAC_FILTER(9)
• DPNI_OPT_HAS_POLICING(9)
• DPNI_OPT_SHARED_CONGESTION(9)
• DPNI_OPT_HAS_KEY_MASKING(9)
• DPNI_OPT_NO_FS(9)
• DPNI_OPT_SHARED_FS(9)
• struct dpni_pools_cfg(9)
• struct dpni_attr(9)
• DPNI_ERROR_EOFHE(9)
• DPNI_ERROR_FLE(9)
• DPNI_ERROR_FPE(9)
• DPNI_ERROR_PHE(9)
• DPNI_ERROR_L3CE(9)
• DPNI_ERROR_L4CE(9)
• enum dpni_error_action(9)
• struct dpni_error_cfg(9)
• DPNI_BUF_LAYOUT_OPT_TIMESTAMP(9)
• DPNI_BUF_LAYOUT_OPT_PARSER_RESULT(9)
• DPNI_BUF_LAYOUT_OPT_FRAME_STATUS(9)
• DPNI_BUF_LAYOUT_OPT_PRIVATE_DATA_SIZE(9)
• DPNI_BUF_LAYOUT_OPT_DATA_ALIGN(9)
• DPNI_BUF_LAYOUT_OPT_DATA_HEAD_ROOM(9)
• DPNI_BUF_LAYOUT_OPT_DATA_TAIL_ROOM(9)
• struct dpni_buffer_layout(9)
• enum dpni_queue_type(9)
• enum dpni_offload(9)
• union dpni_statistics(9)
• struct dpni_link_cfg(9)
• struct dpni_link_state(9)
• enum dpni_dist_mode(9)
• enum dpni_fs_miss_action(9)
• struct dpni_fs_tbl_cfg(9)
• struct dpni_rx_tc_dist_cfg(9)
• DPNI_FS_MISS_DROP(9)
• struct dpni_rx_dist_cfg(9)
• struct dpni_qos_tbl_cfg(9)
• enum dpni_dest(9)
• struct dpni_queue(9)
• struct dpni_queue_id(9)
• enum dpni_congestion_unit(9)
• enum dpni_congestion_point(9)
• struct dpni_dest_cfg(9)
• DPNI_CONG_OPT_FLOW_CONTROL(9)
• struct dpni_congestion_notification_cfg(9)
• struct dpni_rule_cfg(9)
• DPNI_FS_OPT_DISCARD(9)
• DPNI_FS_OPT_SET_FLC(9)
• DPNI_FS_OPT_SET_STASH_CONTROL(9)
• struct dpni_fs_action_cfg(9)
• struct dpni_tx_shaping_cfg(9)
• struct dpni_single_step_cfg(9)

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💡 tiny reminder bestie: THRESHOLD of 0 is not a valid threshold, so don't try it even if the vibe seems right 🙅‍♀️

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and that's the whole page, periodt. source path was cutely truncated as ./drivers/net/ethernet/freesca..., dated October 2026, and this was struct dpni_taildrop(9) — go off, kernel docs, you ate. 🔥👑💖