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Message-ID: <202509031029.iL7rCVvQ-lkp@intel.com>
Date: Wed, 3 Sep 2025 10:29:02 +0800
From: kernel test robot <lkp@...el.com>
To: Maciej Fijalkowski <maciej.fijalkowski@...el.com>, bpf@...r.kernel.org,
ast@...nel.org, daniel@...earbox.net, andrii@...nel.org
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
magnus.karlsson@...el.com, stfomichev@...il.com,
kerneljasonxing@...il.com,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Eryk Kubanski <e.kubanski@...tner.samsung.com>,
Stanislav Fomichev <sdf@...ichev.me>
Subject: Re: [PATCH v8 bpf] xsk: fix immature cq descriptor production
Hi Maciej,
kernel test robot noticed the following build warnings:
[auto build test WARNING on bpf/master]
url: https://github.com/intel-lab-lkp/linux/commits/Maciej-Fijalkowski/xsk-fix-immature-cq-descriptor-production/20250903-060850
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
patch link: https://lore.kernel.org/r/20250902220613.2331265-1-maciej.fijalkowski%40intel.com
patch subject: [PATCH v8 bpf] xsk: fix immature cq descriptor production
config: riscv-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509031029.iL7rCVvQ-lkp@intel.com/config)
compiler: riscv32-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509031029.iL7rCVvQ-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509031029.iL7rCVvQ-lkp@intel.com/
All warnings (new ones prefixed by >>):
net/xdp/xsk.c: In function 'xsk_cq_submit_addr_locked':
>> net/xdp/xsk.c:572:38: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
xskq_prod_write_addr(pool->cq, idx, (u64)skb_shinfo(skb)->destructor_arg);
^
net/xdp/xsk.c: In function 'xsk_set_destructor_arg':
>> net/xdp/xsk.c:625:36: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
skb_shinfo(skb)->destructor_arg = (void *)addr;
^
vim +572 net/xdp/xsk.c
560
561 static void xsk_cq_submit_addr_locked(struct xsk_buff_pool *pool,
562 struct sk_buff *skb)
563 {
564 struct xsk_addr_node *pos, *tmp;
565 u32 descs_processed = 0;
566 unsigned long flags;
567 u32 idx;
568
569 spin_lock_irqsave(&pool->cq_lock, flags);
570 idx = xskq_get_prod(pool->cq);
571
> 572 xskq_prod_write_addr(pool->cq, idx, (u64)skb_shinfo(skb)->destructor_arg);
573 descs_processed++;
574
575 if (unlikely(XSKCB(skb)->num_descs > 1)) {
576 list_for_each_entry_safe(pos, tmp, &XSKCB(skb)->addrs_list, addr_node) {
577 xskq_prod_write_addr(pool->cq, idx + descs_processed,
578 pos->addr);
579 descs_processed++;
580 list_del(&pos->addr_node);
581 kmem_cache_free(xsk_tx_generic_cache, pos);
582 }
583 }
584 xskq_prod_submit_n(pool->cq, descs_processed);
585 spin_unlock_irqrestore(&pool->cq_lock, flags);
586 }
587
588 static void xsk_cq_cancel_locked(struct xsk_buff_pool *pool, u32 n)
589 {
590 unsigned long flags;
591
592 spin_lock_irqsave(&pool->cq_lock, flags);
593 xskq_prod_cancel_n(pool->cq, n);
594 spin_unlock_irqrestore(&pool->cq_lock, flags);
595 }
596
597 static void xsk_inc_num_desc(struct sk_buff *skb)
598 {
599 XSKCB(skb)->num_descs++;
600 }
601
602 static u32 xsk_get_num_desc(struct sk_buff *skb)
603 {
604 return XSKCB(skb)->num_descs;
605 }
606
607 static void xsk_destruct_skb(struct sk_buff *skb)
608 {
609 struct xsk_tx_metadata_compl *compl = &skb_shinfo(skb)->xsk_meta;
610
611 if (compl->tx_timestamp) {
612 /* sw completion timestamp, not a real one */
613 *compl->tx_timestamp = ktime_get_tai_fast_ns();
614 }
615
616 xsk_cq_submit_addr_locked(xdp_sk(skb->sk)->pool, skb);
617 sock_wfree(skb);
618 }
619
620 static void xsk_set_destructor_arg(struct sk_buff *skb, u64 addr)
621 {
622 BUILD_BUG_ON(sizeof(struct xsk_addr_head) > sizeof(skb->cb));
623 INIT_LIST_HEAD(&XSKCB(skb)->addrs_list);
624 XSKCB(skb)->num_descs = 0;
> 625 skb_shinfo(skb)->destructor_arg = (void *)addr;
626 }
627
--
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