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Date: Fri, 21 Jun 2024 09:48:00 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Taehee Yoo <ap420073@...il.com>,
davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, shannon.nelson@....com, brett.creeley@....com,
drivers@...sando.io, netdev@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, ap420073@...il.com,
jacob.e.keller@...el.com
Subject: Re: [PATCH net] ionic: fix kernel panic due to multi-buffer handling
Hi Taehee,
kernel test robot noticed the following build warnings:
url: https://github.com/intel-lab-lkp/linux/commits/Taehee-Yoo/ionic-fix-kernel-panic-due-to-multi-buffer-handling/20240618-121629
base: net/main
patch link: https://lore.kernel.org/r/20240618041412.3184919-1-ap420073%40gmail.com
patch subject: [PATCH net] ionic: fix kernel panic due to multi-buffer handling
config: x86_64-randconfig-161-20240620 (https://download.01.org/0day-ci/archive/20240621/202406211040.17BtI0lu-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
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>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202406211040.17BtI0lu-lkp@intel.com/
New smatch warnings:
drivers/net/ethernet/pensando/ionic/ionic_txrx.c:588 ionic_run_xdp() error: uninitialized symbol 'sinfo'.
Old smatch warnings:
drivers/net/ethernet/pensando/ionic/ionic_txrx.c:253 ionic_rx_build_skb() warn: variable dereferenced before check 'buf_info->page' (see line 237)
drivers/net/ethernet/pensando/ionic/ionic_txrx.c:614 ionic_run_xdp() error: uninitialized symbol 'sinfo'.
vim +/sinfo +588 drivers/net/ethernet/pensando/ionic/ionic_txrx.c
180e35cdf035d1 Shannon Nelson 2024-02-14 483 static bool ionic_run_xdp(struct ionic_rx_stats *stats,
180e35cdf035d1 Shannon Nelson 2024-02-14 484 struct net_device *netdev,
180e35cdf035d1 Shannon Nelson 2024-02-14 485 struct bpf_prog *xdp_prog,
180e35cdf035d1 Shannon Nelson 2024-02-14 486 struct ionic_queue *rxq,
180e35cdf035d1 Shannon Nelson 2024-02-14 487 struct ionic_buf_info *buf_info,
180e35cdf035d1 Shannon Nelson 2024-02-14 488 int len)
180e35cdf035d1 Shannon Nelson 2024-02-14 489 {
17cb07b96a5f58 Taehee Yoo 2024-06-18 490 int remain_len, frag_len, i, err = 0;
17cb07b96a5f58 Taehee Yoo 2024-06-18 491 struct skb_shared_info *sinfo;
180e35cdf035d1 Shannon Nelson 2024-02-14 492 u32 xdp_action = XDP_ABORTED;
180e35cdf035d1 Shannon Nelson 2024-02-14 493 struct xdp_buff xdp_buf;
8eeed8373e1cca Shannon Nelson 2024-02-14 494 struct ionic_queue *txq;
8eeed8373e1cca Shannon Nelson 2024-02-14 495 struct netdev_queue *nq;
8eeed8373e1cca Shannon Nelson 2024-02-14 496 struct xdp_frame *xdpf;
180e35cdf035d1 Shannon Nelson 2024-02-14 497
180e35cdf035d1 Shannon Nelson 2024-02-14 498 xdp_init_buff(&xdp_buf, IONIC_PAGE_SIZE, rxq->xdp_rxq_info);
5377805dc1c02a Shannon Nelson 2024-02-14 499 frag_len = min_t(u16, len, IONIC_XDP_MAX_LINEAR_MTU + VLAN_ETH_HLEN);
180e35cdf035d1 Shannon Nelson 2024-02-14 500 xdp_prepare_buff(&xdp_buf, ionic_rx_buf_va(buf_info),
5377805dc1c02a Shannon Nelson 2024-02-14 501 XDP_PACKET_HEADROOM, frag_len, false);
180e35cdf035d1 Shannon Nelson 2024-02-14 502
180e35cdf035d1 Shannon Nelson 2024-02-14 503 dma_sync_single_range_for_cpu(rxq->dev, ionic_rx_buf_pa(buf_info),
f81da39bf4c0a5 Shannon Nelson 2024-02-14 504 XDP_PACKET_HEADROOM, len,
180e35cdf035d1 Shannon Nelson 2024-02-14 505 DMA_FROM_DEVICE);
180e35cdf035d1 Shannon Nelson 2024-02-14 506
180e35cdf035d1 Shannon Nelson 2024-02-14 507 prefetchw(&xdp_buf.data_hard_start);
180e35cdf035d1 Shannon Nelson 2024-02-14 508
5377805dc1c02a Shannon Nelson 2024-02-14 509 /* We limit MTU size to one buffer if !xdp_has_frags, so
5377805dc1c02a Shannon Nelson 2024-02-14 510 * if the recv len is bigger than one buffer
5377805dc1c02a Shannon Nelson 2024-02-14 511 * then we know we have frag info to gather
5377805dc1c02a Shannon Nelson 2024-02-14 512 */
5377805dc1c02a Shannon Nelson 2024-02-14 513 remain_len = len - frag_len;
5377805dc1c02a Shannon Nelson 2024-02-14 514 if (remain_len) {
5377805dc1c02a Shannon Nelson 2024-02-14 515 struct ionic_buf_info *bi;
5377805dc1c02a Shannon Nelson 2024-02-14 516 skb_frag_t *frag;
5377805dc1c02a Shannon Nelson 2024-02-14 517
5377805dc1c02a Shannon Nelson 2024-02-14 518 bi = buf_info;
5377805dc1c02a Shannon Nelson 2024-02-14 519 sinfo = xdp_get_shared_info_from_buff(&xdp_buf);
5377805dc1c02a Shannon Nelson 2024-02-14 520 sinfo->nr_frags = 0;
5377805dc1c02a Shannon Nelson 2024-02-14 521 sinfo->xdp_frags_size = 0;
5377805dc1c02a Shannon Nelson 2024-02-14 522 xdp_buff_set_frags_flag(&xdp_buf);
5377805dc1c02a Shannon Nelson 2024-02-14 523
5377805dc1c02a Shannon Nelson 2024-02-14 524 do {
5377805dc1c02a Shannon Nelson 2024-02-14 525 if (unlikely(sinfo->nr_frags >= MAX_SKB_FRAGS)) {
5377805dc1c02a Shannon Nelson 2024-02-14 526 err = -ENOSPC;
5377805dc1c02a Shannon Nelson 2024-02-14 527 goto out_xdp_abort;
5377805dc1c02a Shannon Nelson 2024-02-14 528 }
5377805dc1c02a Shannon Nelson 2024-02-14 529
5377805dc1c02a Shannon Nelson 2024-02-14 530 frag = &sinfo->frags[sinfo->nr_frags];
5377805dc1c02a Shannon Nelson 2024-02-14 531 sinfo->nr_frags++;
5377805dc1c02a Shannon Nelson 2024-02-14 532 bi++;
5377805dc1c02a Shannon Nelson 2024-02-14 533 frag_len = min_t(u16, remain_len, ionic_rx_buf_size(bi));
5377805dc1c02a Shannon Nelson 2024-02-14 534 dma_sync_single_range_for_cpu(rxq->dev, ionic_rx_buf_pa(bi),
5377805dc1c02a Shannon Nelson 2024-02-14 535 0, frag_len, DMA_FROM_DEVICE);
5377805dc1c02a Shannon Nelson 2024-02-14 536 skb_frag_fill_page_desc(frag, bi->page, 0, frag_len);
5377805dc1c02a Shannon Nelson 2024-02-14 537 sinfo->xdp_frags_size += frag_len;
5377805dc1c02a Shannon Nelson 2024-02-14 538 remain_len -= frag_len;
5377805dc1c02a Shannon Nelson 2024-02-14 539
5377805dc1c02a Shannon Nelson 2024-02-14 540 if (page_is_pfmemalloc(bi->page))
5377805dc1c02a Shannon Nelson 2024-02-14 541 xdp_buff_set_frag_pfmemalloc(&xdp_buf);
5377805dc1c02a Shannon Nelson 2024-02-14 542 } while (remain_len > 0);
5377805dc1c02a Shannon Nelson 2024-02-14 543 }
sinfo uninitialized on else path.
5377805dc1c02a Shannon Nelson 2024-02-14 544
180e35cdf035d1 Shannon Nelson 2024-02-14 545 xdp_action = bpf_prog_run_xdp(xdp_prog, &xdp_buf);
180e35cdf035d1 Shannon Nelson 2024-02-14 546
180e35cdf035d1 Shannon Nelson 2024-02-14 547 switch (xdp_action) {
180e35cdf035d1 Shannon Nelson 2024-02-14 548 case XDP_PASS:
180e35cdf035d1 Shannon Nelson 2024-02-14 549 stats->xdp_pass++;
180e35cdf035d1 Shannon Nelson 2024-02-14 550 return false; /* false = we didn't consume the packet */
180e35cdf035d1 Shannon Nelson 2024-02-14 551
180e35cdf035d1 Shannon Nelson 2024-02-14 552 case XDP_DROP:
180e35cdf035d1 Shannon Nelson 2024-02-14 553 ionic_rx_page_free(rxq, buf_info);
180e35cdf035d1 Shannon Nelson 2024-02-14 554 stats->xdp_drop++;
180e35cdf035d1 Shannon Nelson 2024-02-14 555 break;
180e35cdf035d1 Shannon Nelson 2024-02-14 556
180e35cdf035d1 Shannon Nelson 2024-02-14 557 case XDP_TX:
8eeed8373e1cca Shannon Nelson 2024-02-14 558 xdpf = xdp_convert_buff_to_frame(&xdp_buf);
8eeed8373e1cca Shannon Nelson 2024-02-14 559 if (!xdpf)
8eeed8373e1cca Shannon Nelson 2024-02-14 560 goto out_xdp_abort;
8eeed8373e1cca Shannon Nelson 2024-02-14 561
8eeed8373e1cca Shannon Nelson 2024-02-14 562 txq = rxq->partner;
8eeed8373e1cca Shannon Nelson 2024-02-14 563 nq = netdev_get_tx_queue(netdev, txq->index);
8eeed8373e1cca Shannon Nelson 2024-02-14 564 __netif_tx_lock(nq, smp_processor_id());
8eeed8373e1cca Shannon Nelson 2024-02-14 565 txq_trans_cond_update(nq);
8eeed8373e1cca Shannon Nelson 2024-02-14 566
8eeed8373e1cca Shannon Nelson 2024-02-14 567 if (netif_tx_queue_stopped(nq) ||
1937b7ab6bd6bd Brett Creeley 2024-02-29 568 !netif_txq_maybe_stop(q_to_ndq(netdev, txq),
061b9bedbef124 Brett Creeley 2024-02-29 569 ionic_q_space_avail(txq),
061b9bedbef124 Brett Creeley 2024-02-29 570 1, 1)) {
8eeed8373e1cca Shannon Nelson 2024-02-14 571 __netif_tx_unlock(nq);
8eeed8373e1cca Shannon Nelson 2024-02-14 572 goto out_xdp_abort;
8eeed8373e1cca Shannon Nelson 2024-02-14 573 }
8eeed8373e1cca Shannon Nelson 2024-02-14 574
8eeed8373e1cca Shannon Nelson 2024-02-14 575 dma_unmap_page(rxq->dev, buf_info->dma_addr,
8eeed8373e1cca Shannon Nelson 2024-02-14 576 IONIC_PAGE_SIZE, DMA_FROM_DEVICE);
1937b7ab6bd6bd Brett Creeley 2024-02-29 577 err = ionic_xdp_post_frame(txq, xdpf, XDP_TX,
8eeed8373e1cca Shannon Nelson 2024-02-14 578 buf_info->page,
8eeed8373e1cca Shannon Nelson 2024-02-14 579 buf_info->page_offset,
8eeed8373e1cca Shannon Nelson 2024-02-14 580 true);
8eeed8373e1cca Shannon Nelson 2024-02-14 581 __netif_tx_unlock(nq);
8eeed8373e1cca Shannon Nelson 2024-02-14 582 if (err) {
8eeed8373e1cca Shannon Nelson 2024-02-14 583 netdev_dbg(netdev, "tx ionic_xdp_post_frame err %d\n", err);
8eeed8373e1cca Shannon Nelson 2024-02-14 584 goto out_xdp_abort;
8eeed8373e1cca Shannon Nelson 2024-02-14 585 }
491aee894a08bc Taehee Yoo 2024-06-03 586 buf_info->page = NULL;
17cb07b96a5f58 Taehee Yoo 2024-06-18 587 if (xdp_frame_has_frags(xdpf)) {
17cb07b96a5f58 Taehee Yoo 2024-06-18 @588 for (i = 0; i < sinfo->nr_frags; i++) {
^^^^^
Warning generated here
17cb07b96a5f58 Taehee Yoo 2024-06-18 589 buf_info++;
17cb07b96a5f58 Taehee Yoo 2024-06-18 590 dma_unmap_page(rxq->dev, buf_info->dma_addr,
17cb07b96a5f58 Taehee Yoo 2024-06-18 591 IONIC_PAGE_SIZE, DMA_FROM_DEVICE);
17cb07b96a5f58 Taehee Yoo 2024-06-18 592 buf_info->page = NULL;
17cb07b96a5f58 Taehee Yoo 2024-06-18 593 }
17cb07b96a5f58 Taehee Yoo 2024-06-18 594 }
17cb07b96a5f58 Taehee Yoo 2024-06-18 595
8eeed8373e1cca Shannon Nelson 2024-02-14 596 stats->xdp_tx++;
8eeed8373e1cca Shannon Nelson 2024-02-14 597
8eeed8373e1cca Shannon Nelson 2024-02-14 598 /* the Tx completion will free the buffers */
8eeed8373e1cca Shannon Nelson 2024-02-14 599 break;
8eeed8373e1cca Shannon Nelson 2024-02-14 600
180e35cdf035d1 Shannon Nelson 2024-02-14 601 case XDP_REDIRECT:
17cb07b96a5f58 Taehee Yoo 2024-06-18 602 xdpf = xdp_convert_buff_to_frame(&xdp_buf);
587fc3f0dceb08 Shannon Nelson 2024-02-14 603 /* unmap the pages before handing them to a different device */
587fc3f0dceb08 Shannon Nelson 2024-02-14 604 dma_unmap_page(rxq->dev, buf_info->dma_addr,
587fc3f0dceb08 Shannon Nelson 2024-02-14 605 IONIC_PAGE_SIZE, DMA_FROM_DEVICE);
587fc3f0dceb08 Shannon Nelson 2024-02-14 606
587fc3f0dceb08 Shannon Nelson 2024-02-14 607 err = xdp_do_redirect(netdev, &xdp_buf, xdp_prog);
587fc3f0dceb08 Shannon Nelson 2024-02-14 608 if (err) {
587fc3f0dceb08 Shannon Nelson 2024-02-14 609 netdev_dbg(netdev, "xdp_do_redirect err %d\n", err);
587fc3f0dceb08 Shannon Nelson 2024-02-14 610 goto out_xdp_abort;
587fc3f0dceb08 Shannon Nelson 2024-02-14 611 }
587fc3f0dceb08 Shannon Nelson 2024-02-14 612 buf_info->page = NULL;
17cb07b96a5f58 Taehee Yoo 2024-06-18 613 if (xdp_frame_has_frags(xdpf)) {
17cb07b96a5f58 Taehee Yoo 2024-06-18 614 for (i = 0; i < sinfo->nr_frags; i++) {
17cb07b96a5f58 Taehee Yoo 2024-06-18 615 buf_info++;
17cb07b96a5f58 Taehee Yoo 2024-06-18 616 dma_unmap_page(rxq->dev, buf_info->dma_addr,
17cb07b96a5f58 Taehee Yoo 2024-06-18 617 IONIC_PAGE_SIZE, DMA_FROM_DEVICE);
17cb07b96a5f58 Taehee Yoo 2024-06-18 618 buf_info->page = NULL;
17cb07b96a5f58 Taehee Yoo 2024-06-18 619 }
17cb07b96a5f58 Taehee Yoo 2024-06-18 620 }
17cb07b96a5f58 Taehee Yoo 2024-06-18 621
587fc3f0dceb08 Shannon Nelson 2024-02-14 622 rxq->xdp_flush = true;
587fc3f0dceb08 Shannon Nelson 2024-02-14 623 stats->xdp_redirect++;
587fc3f0dceb08 Shannon Nelson 2024-02-14 624 break;
587fc3f0dceb08 Shannon Nelson 2024-02-14 625
180e35cdf035d1 Shannon Nelson 2024-02-14 626 case XDP_ABORTED:
180e35cdf035d1 Shannon Nelson 2024-02-14 627 default:
8eeed8373e1cca Shannon Nelson 2024-02-14 628 goto out_xdp_abort;
8eeed8373e1cca Shannon Nelson 2024-02-14 629 }
8eeed8373e1cca Shannon Nelson 2024-02-14 630
8eeed8373e1cca Shannon Nelson 2024-02-14 631 return true;
8eeed8373e1cca Shannon Nelson 2024-02-14 632
8eeed8373e1cca Shannon Nelson 2024-02-14 633 out_xdp_abort:
180e35cdf035d1 Shannon Nelson 2024-02-14 634 trace_xdp_exception(netdev, xdp_prog, xdp_action);
180e35cdf035d1 Shannon Nelson 2024-02-14 635 ionic_rx_page_free(rxq, buf_info);
180e35cdf035d1 Shannon Nelson 2024-02-14 636 stats->xdp_aborted++;
180e35cdf035d1 Shannon Nelson 2024-02-14 637
180e35cdf035d1 Shannon Nelson 2024-02-14 638 return true;
180e35cdf035d1 Shannon Nelson 2024-02-14 639 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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