From: kernel test robot <lkp@intel.com>
To: Jason Xing <kerneljasonxing@gmail.com>,
anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com,
andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, bjorn@kernel.org,
magnus.karlsson@intel.com, maciej.fijalkowski@intel.com,
jonathan.lemon@gmail.com, sdf@fomichev.me, ast@kernel.org,
daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com,
mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
linux-stm32@st-md-mailman.stormreply.com, bpf@vger.kernel.org,
intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
Jason Xing <kernelxing@tencent.com>
Subject: Re: [Intel-wired-lan] [PATCH net v2 1/2] stmmac: xsk: fix underflow of budget in zerocopy mode
Date: Wed, 23 Jul 2025 14:43:18 +0800 [thread overview]
Message-ID: <202507231458.meHSJi2g-lkp@intel.com> (raw)
In-Reply-To: <20250722135057.85386-2-kerneljasonxing@gmail.com>
Hi Jason,
kernel test robot noticed the following build warnings:
[auto build test WARNING on net/main]
url: https://github.com/intel-lab-lkp/linux/commits/Jason-Xing/stmmac-xsk-fix-underflow-of-budget-in-zerocopy-mode/20250722-215348
base: net/main
patch link: https://lore.kernel.org/r/20250722135057.85386-2-kerneljasonxing%40gmail.com
patch subject: [Intel-wired-lan] [PATCH net v2 1/2] stmmac: xsk: fix underflow of budget in zerocopy mode
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20250723/202507231458.meHSJi2g-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250723/202507231458.meHSJi2g-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507231458.meHSJi2g-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2601:3: warning: misleading indentation; statement is not part of the previous 'for' [-Wmisleading-indentation]
2601 | struct xsk_tx_metadata *meta = NULL;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2599:2: note: previous statement is here
2599 | for (; budget > 0; budget--)
| ^
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2600:34: warning: unused variable 'meta_req' [-Wunused-variable]
2600 | struct stmmac_metadata_request meta_req;
| ^~~~~~~~
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2611:4: error: 'break' statement not in loop or switch statement
2611 | break;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2615:4: error: 'break' statement not in loop or switch statement
2615 | break;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2621:4: error: 'continue' statement not in loop statement
2621 | continue;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2660:3: error: use of undeclared identifier 'meta_req'
2660 | meta_req.priv = priv;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2661:3: error: use of undeclared identifier 'meta_req'
2661 | meta_req.tx_desc = tx_desc;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2662:3: error: use of undeclared identifier 'meta_req'
2662 | meta_req.set_ic = &set_ic;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2663:3: error: use of undeclared identifier 'meta_req'
2663 | meta_req.tbs = tx_q->tbs;
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2664:3: error: use of undeclared identifier 'meta_req'
2664 | meta_req.edesc = &tx_q->dma_entx[entry];
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2666:7: error: use of undeclared identifier 'meta_req'; did you mean 'net_eq'?
2666 | &meta_req);
| ^~~~~~~~
| net_eq
include/net/net_namespace.h:292:5: note: 'net_eq' declared here
292 | int net_eq(const struct net *net1, const struct net *net2)
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:25: error: expected parameter declarator
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:25: error: expected ')'
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:24: note: to match this '('
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:2: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
| int
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:24: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
| void
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:2: error: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C23, conflicting with a previous declaration [-Werror,-Wdeprecated-non-prototype]
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
include/linux/u64_stats_sync.h:181:20: note: conflicting prototype is here
181 | static inline void u64_stats_update_begin(struct u64_stats_sync *syncp)
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2685:2: error: conflicting types for 'u64_stats_update_begin'
2685 | u64_stats_update_begin(&txq_stats->napi_syncp);
| ^
include/linux/u64_stats_sync.h:181:20: note: previous definition is here
181 | static inline void u64_stats_update_begin(struct u64_stats_sync *syncp)
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2686:16: error: expected parameter declarator
2686 | u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2686:16: error: expected ')'
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2686:15: note: to match this '('
2686 | u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
| ^
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2686:2: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
2686 | u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
| ^
| int
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:2686:15: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
2686 | u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
| ^
| void
fatal error: too many errors emitted, stopping now [-ferror-limit=]
2 warnings and 20 errors generated.
vim +/for +2601 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
1347b419318d6af Song Yoong Siang 2023-11-27 2581
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2582 static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget)
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2583 {
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2584 struct netdev_queue *nq = netdev_get_tx_queue(priv->dev, queue);
8531c80800c10e8 Christian Marangi 2022-07-23 2585 struct stmmac_tx_queue *tx_q = &priv->dma_conf.tx_queue[queue];
8070274b472e2e9 Jisheng Zhang 2023-09-18 2586 struct stmmac_txq_stats *txq_stats = &priv->xstats.txq_stats[queue];
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2587 struct xsk_buff_pool *pool = tx_q->xsk_pool;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2588 unsigned int entry = tx_q->cur_tx;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2589 struct dma_desc *tx_desc = NULL;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2590 struct xdp_desc xdp_desc;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2591 bool work_done = true;
133466c3bbe171f Jisheng Zhang 2023-07-18 2592 u32 tx_set_ic_bit = 0;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2593
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2594 /* Avoids TX time-out as we are sharing with slow path */
e92af33e472cf3a Alexander Lobakin 2021-11-17 2595 txq_trans_cond_update(nq);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2596
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2597 budget = min(budget, stmmac_tx_avail(priv, queue));
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2598
9074ec4e205d86d Jason Xing 2025-07-22 2599 for (; budget > 0; budget--)
1347b419318d6af Song Yoong Siang 2023-11-27 @2600 struct stmmac_metadata_request meta_req;
1347b419318d6af Song Yoong Siang 2023-11-27 @2601 struct xsk_tx_metadata *meta = NULL;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2602 dma_addr_t dma_addr;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2603 bool set_ic;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2604
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2605 /* We are sharing with slow path and stop XSK TX desc submission when
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2606 * available TX ring is less than threshold.
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2607 */
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2608 if (unlikely(stmmac_tx_avail(priv, queue) < STMMAC_TX_XSK_AVAIL) ||
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2609 !netif_carrier_ok(priv->dev)) {
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2610 work_done = false;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2611 break;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2612 }
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2613
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2614 if (!xsk_tx_peek_desc(pool, &xdp_desc))
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2615 break;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2616
bd17382ac36ed97 Xiaolei Wang 2024-05-13 2617 if (priv->est && priv->est->enable &&
bd17382ac36ed97 Xiaolei Wang 2024-05-13 2618 priv->est->max_sdu[queue] &&
bd17382ac36ed97 Xiaolei Wang 2024-05-13 2619 xdp_desc.len > priv->est->max_sdu[queue]) {
c5c3e1bfc9e0ee7 Rohan G Thomas 2024-01-27 2620 priv->xstats.max_sdu_txq_drop[queue]++;
c5c3e1bfc9e0ee7 Rohan G Thomas 2024-01-27 2621 continue;
c5c3e1bfc9e0ee7 Rohan G Thomas 2024-01-27 2622 }
c5c3e1bfc9e0ee7 Rohan G Thomas 2024-01-27 2623
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2624 if (likely(priv->extend_desc))
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2625 tx_desc = (struct dma_desc *)(tx_q->dma_etx + entry);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2626 else if (tx_q->tbs & STMMAC_TBS_AVAIL)
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2627 tx_desc = &tx_q->dma_entx[entry].basic;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2628 else
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2629 tx_desc = tx_q->dma_tx + entry;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2630
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2631 dma_addr = xsk_buff_raw_get_dma(pool, xdp_desc.addr);
1347b419318d6af Song Yoong Siang 2023-11-27 2632 meta = xsk_buff_get_metadata(pool, xdp_desc.addr);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2633 xsk_buff_raw_dma_sync_for_device(pool, dma_addr, xdp_desc.len);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2634
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2635 tx_q->tx_skbuff_dma[entry].buf_type = STMMAC_TXBUF_T_XSK_TX;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2636
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2637 /* To return XDP buffer to XSK pool, we simple call
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2638 * xsk_tx_completed(), so we don't need to fill up
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2639 * 'buf' and 'xdpf'.
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2640 */
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2641 tx_q->tx_skbuff_dma[entry].buf = 0;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2642 tx_q->xdpf[entry] = NULL;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2643
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2644 tx_q->tx_skbuff_dma[entry].map_as_page = false;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2645 tx_q->tx_skbuff_dma[entry].len = xdp_desc.len;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2646 tx_q->tx_skbuff_dma[entry].last_segment = true;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2647 tx_q->tx_skbuff_dma[entry].is_jumbo = false;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2648
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2649 stmmac_set_desc_addr(priv, tx_desc, dma_addr);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2650
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2651 tx_q->tx_count_frames++;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2652
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2653 if (!priv->tx_coal_frames[queue])
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2654 set_ic = false;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2655 else if (tx_q->tx_count_frames % priv->tx_coal_frames[queue] == 0)
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2656 set_ic = true;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2657 else
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2658 set_ic = false;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2659
1347b419318d6af Song Yoong Siang 2023-11-27 2660 meta_req.priv = priv;
1347b419318d6af Song Yoong Siang 2023-11-27 2661 meta_req.tx_desc = tx_desc;
1347b419318d6af Song Yoong Siang 2023-11-27 2662 meta_req.set_ic = &set_ic;
04f64dea13640fb Song Yoong Siang 2025-02-16 2663 meta_req.tbs = tx_q->tbs;
04f64dea13640fb Song Yoong Siang 2025-02-16 2664 meta_req.edesc = &tx_q->dma_entx[entry];
1347b419318d6af Song Yoong Siang 2023-11-27 2665 xsk_tx_metadata_request(meta, &stmmac_xsk_tx_metadata_ops,
1347b419318d6af Song Yoong Siang 2023-11-27 2666 &meta_req);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2667 if (set_ic) {
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2668 tx_q->tx_count_frames = 0;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2669 stmmac_set_tx_ic(priv, tx_desc);
133466c3bbe171f Jisheng Zhang 2023-07-18 2670 tx_set_ic_bit++;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2671 }
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2672
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2673 stmmac_prepare_tx_desc(priv, tx_desc, 1, xdp_desc.len,
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2674 true, priv->mode, true, true,
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2675 xdp_desc.len);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2676
ad72f783de06827 Yanteng Si 2024-08-07 2677 stmmac_enable_dma_transmission(priv, priv->ioaddr, queue);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2678
1347b419318d6af Song Yoong Siang 2023-11-27 2679 xsk_tx_metadata_to_compl(meta,
1347b419318d6af Song Yoong Siang 2023-11-27 2680 &tx_q->tx_skbuff_dma[entry].xsk_meta);
1347b419318d6af Song Yoong Siang 2023-11-27 2681
8531c80800c10e8 Christian Marangi 2022-07-23 2682 tx_q->cur_tx = STMMAC_GET_ENTRY(tx_q->cur_tx, priv->dma_conf.dma_tx_size);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2683 entry = tx_q->cur_tx;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2684 }
38cc3c6dcc09dc3 Petr Tesarik 2024-02-03 2685 u64_stats_update_begin(&txq_stats->napi_syncp);
38cc3c6dcc09dc3 Petr Tesarik 2024-02-03 2686 u64_stats_add(&txq_stats->napi.tx_set_ic_bit, tx_set_ic_bit);
38cc3c6dcc09dc3 Petr Tesarik 2024-02-03 2687 u64_stats_update_end(&txq_stats->napi_syncp);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2688
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2689 if (tx_desc) {
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2690 stmmac_flush_tx_descriptors(priv, queue);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2691 xsk_tx_release(pool);
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2692 }
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2693
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2694 /* Return true if all of the 3 conditions are met
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2695 * a) TX Budget is still available
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2696 * b) work_done = true when XSK TX desc peek is empty (no more
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2697 * pending XSK TX for transmission)
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2698 */
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2699 return !!budget && work_done;
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2700 }
132c32ee5bc09b1 Ong Boon Leong 2021-04-13 2701
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2025-07-23 6:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-22 13:50 [PATCH net v2 0/2] xsk: fix underflow issues in zerocopy xmit Jason Xing
2025-07-22 13:50 ` [Intel-wired-lan] " Jason Xing
2025-07-22 13:50 ` [PATCH net v2 1/2] stmmac: xsk: fix underflow of budget in zerocopy mode Jason Xing
2025-07-22 13:50 ` [Intel-wired-lan] " Jason Xing
2025-07-22 15:03 ` Loktionov, Aleksandr
2025-07-22 15:03 ` Loktionov, Aleksandr
2025-07-23 4:09 ` kernel test robot
2025-07-23 4:16 ` Jason Xing
2025-07-23 6:43 ` kernel test robot [this message]
2025-07-22 13:50 ` [PATCH net v2 2/2] igb: xsk: solve underflow of nb_pkts " Jason Xing
2025-07-22 13:50 ` [Intel-wired-lan] " Jason Xing
2025-07-22 15:03 ` Loktionov, Aleksandr
2025-07-22 15:03 ` Loktionov, Aleksandr
2025-07-22 23:07 ` [PATCH net v2 0/2] xsk: fix underflow issues in zerocopy xmit Jason Xing
2025-07-22 23:07 ` [Intel-wired-lan] " Jason Xing
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all data and code used by this external index.