selftests/bpf: fix vmtest.sh to launch smp vm. #29

kernel-patches-bot · 2022-02-17T15:56:48Z

Pull request for series with
subject: selftests/bpf: fix vmtest.sh to launch smp vm.
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=615477

kernel-patches-bot · 2022-02-17T15:56:48Z

Master branch: 9e98ace
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=615477
version: 1

kernel-patches-bot · 2022-02-17T16:09:32Z

Master branch: 1b8c924
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=615477
version: 1

Fix typo in vmtest.sh to make sure it launch proper vm with 8 cpus. Signed-off-by: Yucong Sun <fallentree@fb.com>

kernel-patches-bot · 2022-02-17T19:02:03Z

At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=615477 irrelevant now. Closing PR.

The trace_hardirqs_{on,off}() require the caller to setup frame pointer properly. This because these two functions use macro 'CALLER_ADDR1' (aka. __builtin_return_address(1)) to acquire caller info. If the $fp is used for other purpose, the code generated this macro (as below) could trigger memory access fault. 0xffffffff8011510e <+80>: ld a1,-16(s0) 0xffffffff80115112 <+84>: ld s2,-8(a1) # <-- paging fault here The oops message during booting if compiled with 'irqoff' tracer enabled: [ 0.039615][ T0] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000f8 [ 0.041925][ T0] Oops [#1] [ 0.042063][ T0] Modules linked in: [ 0.042864][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-rc1-00233-g9a20c48d1ed2 #29 [ 0.043568][ T0] Hardware name: riscv-virtio,qemu (DT) [ 0.044343][ T0] epc : trace_hardirqs_on+0x56/0xe2 [ 0.044601][ T0] ra : restore_all+0x12/0x6e [ 0.044721][ T0] epc : ffffffff80126a5c ra : ffffffff80003b94 sp : ffffffff81403db0 [ 0.044801][ T0] gp : ffffffff8163acd8 tp : ffffffff81414880 t0 : 0000000000000020 [ 0.044882][ T0] t1 : 0098968000000000 t2 : 0000000000000000 s0 : ffffffff81403de0 [ 0.044967][ T0] s1 : 0000000000000000 a0 : 0000000000000001 a1 : 0000000000000100 [ 0.045046][ T0] a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.045124][ T0] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000054494d45 [ 0.045210][ T0] s2 : ffffffff80003b94 s3 : ffffffff81a8f1b0 s4 : ffffffff80e27b50 [ 0.045289][ T0] s5 : ffffffff81414880 s6 : ffffffff8160fa00 s7 : 00000000800120e8 [ 0.045389][ T0] s8 : 0000000080013100 s9 : 000000000000007f s10: 0000000000000000 [ 0.045474][ T0] s11: 0000000000000000 t3 : 7fffffffffffffff t4 : 0000000000000000 [ 0.045548][ T0] t5 : 0000000000000000 t6 : ffffffff814aa368 [ 0.045620][ T0] status: 0000000200000100 badaddr: 00000000000000f8 cause: 000000000000000d [ 0.046402][ T0] [<ffffffff80003b94>] restore_all+0x12/0x6e This because the $fp(aka. $s0) register is not used as frame pointer in the assembly entry code. resume_kernel: REG_L s0, TASK_TI_PREEMPT_COUNT(tp) bnez s0, restore_all REG_L s0, TASK_TI_FLAGS(tp) andi s0, s0, _TIF_NEED_RESCHED beqz s0, restore_all call preempt_schedule_irq j restore_all To fix above issue, here we add one extra level wrapper for function trace_hardirqs_{on,off}() so they can be safely called by low level entry code. Signed-off-by: Changbin Du <changbin.du@gmail.com> Fixes: 3c46979 ("riscv: Enable LOCKDEP_SUPPORT & fixup TRACE_IRQFLAGS_SUPPORT") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

The following has been observed when running stressng mmap since commit b653db7 ("mm: Clear page->private when splitting or migrating a page") watchdog: BUG: soft lockup - CPU#75 stuck for 26s! [stress-ng:9546] CPU: 75 PID: 9546 Comm: stress-ng Tainted: G E 6.0.0-revert-b653db77-fix+ #29 0357d79b60fb09775f678e4f3f64ef0579ad1374 Hardware name: SGI.COM C2112-4GP3/X10DRT-P-Series, BIOS 2.0a 05/09/2016 RIP: 0010:xas_descend+0x28/0x80 Code: cc cc 0f b6 0e 48 8b 57 08 48 d3 ea 83 e2 3f 89 d0 48 83 c0 04 48 8b 44 c6 08 48 89 77 18 48 89 c1 83 e1 03 48 83 f9 02 75 08 <48> 3d fd 00 00 00 76 08 88 57 12 c3 cc cc cc cc 48 c1 e8 02 89 c2 RSP: 0018:ffffbbf02a2236a8 EFLAGS: 00000246 RAX: ffff9cab7d6a0002 RBX: ffffe04b0af88040 RCX: 0000000000000002 RDX: 0000000000000030 RSI: ffff9cab60509b60 RDI: ffffbbf02a2236c0 RBP: 0000000000000000 R08: ffff9cab60509b60 R09: ffffbbf02a2236c0 R10: 0000000000000001 R11: ffffbbf02a223698 R12: 0000000000000000 R13: ffff9cab4e28da80 R14: 0000000000039c01 R15: ffff9cab4e28da88 FS: 00007fab89b85e40(0000) GS:ffff9cea3fcc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fab84e00000 CR3: 00000040b73a4003 CR4: 00000000003706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> xas_load+0x3a/0x50 __filemap_get_folio+0x80/0x370 ? put_swap_page+0x163/0x360 pagecache_get_page+0x13/0x90 __try_to_reclaim_swap+0x50/0x190 scan_swap_map_slots+0x31e/0x670 get_swap_pages+0x226/0x3c0 folio_alloc_swap+0x1cc/0x240 add_to_swap+0x14/0x70 shrink_page_list+0x968/0xbc0 reclaim_page_list+0x70/0xf0 reclaim_pages+0xdd/0x120 madvise_cold_or_pageout_pte_range+0x814/0xf30 walk_pgd_range+0x637/0xa30 __walk_page_range+0x142/0x170 walk_page_range+0x146/0x170 madvise_pageout+0xb7/0x280 ? asm_common_interrupt+0x22/0x40 madvise_vma_behavior+0x3b7/0xac0 ? find_vma+0x4a/0x70 ? find_vma+0x64/0x70 ? madvise_vma_anon_name+0x40/0x40 madvise_walk_vmas+0xa6/0x130 do_madvise+0x2f4/0x360 __x64_sys_madvise+0x26/0x30 do_syscall_64+0x5b/0x80 ? do_syscall_64+0x67/0x80 ? syscall_exit_to_user_mode+0x17/0x40 ? do_syscall_64+0x67/0x80 ? syscall_exit_to_user_mode+0x17/0x40 ? do_syscall_64+0x67/0x80 ? do_syscall_64+0x67/0x80 ? common_interrupt+0x8b/0xa0 entry_SYSCALL_64_after_hwframe+0x63/0xcd The problem can be reproduced with the mmtests config config-workload-stressng-mmap. It does not always happen and when it triggers is variable but it has happened on multiple machines. The intent of commit b653db7 patch was to avoid the case where PG_private is clear but folio->private is not-NULL. However, THP tail pages uses page->private for "swp_entry_t if folio_test_swapcache()" as stated in the documentation for struct folio. This patch only clobbers page->private for tail pages if the head page was not in swapcache and warns once if page->private had an unexpected value. Link: https://lkml.kernel.org/r/20221019134156.zjyyn5aownakvztf@techsingularity.net Fixes: b653db7 ("mm: Clear page->private when splitting or migrating a page") Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Yang Shi <shy828301@gmail.com> Cc: Brian Foster <bfoster@redhat.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Oleksandr Natalenko <oleksandr@natalenko.name> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

As previously explained, the rehash delayed work migrates filters from one region to another. This is done by iterating over all chunks (all the filters with the same priority) in the region and in each chunk iterating over all the filters. When the work runs out of credits it stores the current chunk and entry as markers in the per-work context so that it would know where to resume the migration from the next time the work is scheduled. Upon error, the chunk marker is reset to NULL, but without resetting the entry markers despite being relative to it. This can result in migration being resumed from an entry that does not belong to the chunk being migrated. In turn, this will eventually lead to a chunk being iterated over as if it is an entry. Because of how the two structures happen to be defined, this does not lead to KASAN splats, but to warnings such as [1]. Fix by creating a helper that resets all the markers and call it from all the places the currently only reset the chunk marker. For good measures also call it when starting a completely new rehash. Add a warning to avoid future cases. [1] WARNING: CPU: 7 PID: 1076 at drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c:407 mlxsw_afk_encode+0x242/0x2f0 Modules linked in: CPU: 7 PID: 1076 Comm: kworker/7:24 Tainted: G W 6.9.0-rc3-custom-00880-g29e61d91b77b #29 Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019 Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP: 0010:mlxsw_afk_encode+0x242/0x2f0 [...] Call Trace: <TASK> mlxsw_sp_acl_atcam_entry_add+0xd9/0x3c0 mlxsw_sp_acl_tcam_entry_create+0x5e/0xa0 mlxsw_sp_acl_tcam_vchunk_migrate_all+0x109/0x290 mlxsw_sp_acl_tcam_vregion_rehash_work+0x6c/0x470 process_one_work+0x151/0x370 worker_thread+0x2cb/0x3e0 kthread+0xd0/0x100 ret_from_fork+0x34/0x50 </TASK> Fixes: 6f9579d ("mlxsw: spectrum_acl: Remember where to continue rehash migration") Signed-off-by: Ido Schimmel <idosch@nvidia.com> Tested-by: Alexander Zubkov <green@qrator.net> Reviewed-by: Petr Machata <petrm@nvidia.com> Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://lore.kernel.org/r/cc17eed86b41dd829d39b07906fec074a9ce580e.1713797103.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Reinitialize the whole EST structure would also reset the mutex lock which is embedded in the EST structure, and then trigger the following warning. To address this, move the lock to struct stmmac_priv. We also need to reacquire the mutex lock when doing this initialization. DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: CPU: 3 PID: 505 at kernel/locking/mutex.c:587 __mutex_lock+0xd84/0x1068 Modules linked in: CPU: 3 PID: 505 Comm: tc Not tainted 6.9.0-rc6-00053-g0106679839f7-dirty #29 Hardware name: NXP i.MX8MPlus EVK board (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mutex_lock+0xd84/0x1068 lr : __mutex_lock+0xd84/0x1068 sp : ffffffc0864e3570 x29: ffffffc0864e3570 x28: ffffffc0817bdc78 x27: 0000000000000003 x26: ffffff80c54f1808 x25: ffffff80c9164080 x24: ffffffc080d723ac x23: 0000000000000000 x22: 0000000000000002 x21: 0000000000000000 x20: 0000000000000000 x19: ffffffc083bc3000 x18: ffffffffffffffff x17: ffffffc08117b080 x16: 0000000000000002 x15: ffffff80d2d40000 x14: 00000000000002da x13: ffffff80d2d404b8 x12: ffffffc082b5a5c8 x11: ffffffc082bca680 x10: ffffffc082bb2640 x9 : ffffffc082bb2698 x8 : 0000000000017fe8 x7 : c0000000ffffefff x6 : 0000000000000001 x5 : ffffff8178fe0d48 x4 : 0000000000000000 x3 : 0000000000000027 x2 : ffffff8178fe0d50 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __mutex_lock+0xd84/0x1068 mutex_lock_nested+0x28/0x34 tc_setup_taprio+0x118/0x68c stmmac_setup_tc+0x50/0xf0 taprio_change+0x868/0xc9c Fixes: b2aae65 ("net: stmmac: add mutex lock to protect est parameters") Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Andrew Halaney <ahalaney@redhat.com> Link: https://lore.kernel.org/r/20240513014346.1718740-2-xiaolei.wang@windriver.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>

cpumask_of_node() can be called for NUMA_NO_NODE inside do_map_benchmark() resulting in the following sanitizer report: UBSAN: array-index-out-of-bounds in ./arch/x86/include/asm/topology.h:72:28 index -1 is out of range for type 'cpumask [64][1]' CPU: 1 PID: 990 Comm: dma_map_benchma Not tainted 6.9.0-rc6 #29 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:117) ubsan_epilogue (lib/ubsan.c:232) __ubsan_handle_out_of_bounds (lib/ubsan.c:429) cpumask_of_node (arch/x86/include/asm/topology.h:72) [inline] do_map_benchmark (kernel/dma/map_benchmark.c:104) map_benchmark_ioctl (kernel/dma/map_benchmark.c:246) full_proxy_unlocked_ioctl (fs/debugfs/file.c:333) __x64_sys_ioctl (fs/ioctl.c:890) do_syscall_64 (arch/x86/entry/common.c:83) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Use cpumask_of_node() in place when binding a kernel thread to a cpuset of a particular node. Note that the provided node id is checked inside map_benchmark_ioctl(). It's just a NUMA_NO_NODE case which is not handled properly later. Found by Linux Verification Center (linuxtesting.org). Fixes: 65789da ("dma-mapping: add benchmark support for streaming DMA APIs") Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> Acked-by: Barry Song <baohua@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de>

Run BPF selftests bpf_tcp_ca on Loongarch: ./test_progs -t bpf_tcp_ca A "Segmentation fault" error occurs: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 settcpca:FAIL:setsockopt unexpected setsockopt: actual -1 == expected -1 (network_helpers.c:99: errno: No such file or directory) Failed to call post_socket_cb start_test:FAIL:start_server_str unexpected start_server_str: actual -1 == expected -1 test_update_ca:FAIL:ca1_ca1_cnt unexpected ca1_ca1_cnt: actual 0 <= expected 0 #29/9 bpf_tcp_ca/update_ca:FAIL #29 bpf_tcp_ca:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x5555567ed91c] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee408b0] ./test_progs(bpf_link__update_map+0x80)[0x555556824a78] ./test_progs(+0x94d68)[0x5555564c4d68] ./test_progs(test_bpf_tcp_ca+0xe8)[0x5555564c6a88] ./test_progs(+0x3bde54)[0x5555567ede54] ./test_progs(main+0x61c)[0x5555567efd54] /usr/lib64/libc.so.6(+0x22208)[0x7ffff2aaa208] /usr/lib64/libc.so.6(__libc_start_main+0xac)[0x7ffff2aaa30c] ./test_progs(_start+0x48)[0x55555646bca8] Segmentation fault ''' This is because "link" is NULL in that case. This patch adds null checks for link in bpf_tcp_ca to fix this error. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

Run bpf_tcp_ca selftests (./test_progs -t bpf_tcp_ca) on a Loongarch platform, some "Segmentation fault" errors occur: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 settcpca:FAIL:setsockopt unexpected setsockopt: \ actual -1 == expected -1 (network_helpers.c:99: errno: No such file or directory) \ Failed to call post_socket_cb start_test:FAIL:start_server_str unexpected start_server_str: \ actual -1 == expected -1 test_update_ca:FAIL:ca1_ca1_cnt unexpected ca1_ca1_cnt: \ actual 0 <= expected 0 #29/9 bpf_tcp_ca/update_ca:FAIL #29 bpf_tcp_ca:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x5555567ed91c] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee408b0] ./test_progs(bpf_link__update_map+0x80)[0x555556824a78] ./test_progs(+0x94d68)[0x5555564c4d68] ./test_progs(test_bpf_tcp_ca+0xe8)[0x5555564c6a88] ./test_progs(+0x3bde54)[0x5555567ede54] ./test_progs(main+0x61c)[0x5555567efd54] /usr/lib64/libc.so.6(+0x22208)[0x7ffff2aaa208] /usr/lib64/libc.so.6(__libc_start_main+0xac)[0x7ffff2aaa30c] ./test_progs(_start+0x48)[0x55555646bca8] Segmentation fault ''' This is because "link" returned by bpf_map__attach_struct_ops() is NULL in this case. test_progs crashs when this NULL link passes to bpf_link__update_map(). This patch adds NULL checks for all links in bpf_tcp_ca to fix these errors. If "link" is NULL, goto the newly added label "err" to destroy the skel. v2: - use "goto err" instead of "return" as Eduard suggested. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

Although the "Segmentation fault" errors are fixed in the last commit, run bpf_tcp_ca selftests (./test_progs -t bpf_tcp_ca) on a Loongarch platform, still some other "ENOTSUPP" (-524) errors left since lacking BPF trampoline on Loongarch: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL #29/3 bpf_tcp_ca/invalid_license:OK test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL #29/5 bpf_tcp_ca/rel_setsockopt:OK test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL #29/7 bpf_tcp_ca/incompl_cong_ops:OK #29/8 bpf_tcp_ca/unsupp_cong_op:OK test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 #29/9 bpf_tcp_ca/update_ca:FAIL test_update_wrong:PASS:open 0 nsec test_update_wrong:FAIL:attach_struct_ops unexpected error: -524 #29/10 bpf_tcp_ca/update_wrong:FAIL test_mixed_links:PASS:open 0 nsec test_mixed_links:FAIL:attach_struct_ops_nl unexpected error: -524 test_mixed_links:FAIL:attach_struct_ops unexpected error: -524 #29/11 bpf_tcp_ca/mixed_links:FAIL test_multi_links:PASS:open 0 nsec test_multi_links:FAIL:attach_struct_ops_1st unexpected error: -524 test_multi_links:FAIL:attach_struct_ops_2nd unexpected error: -524 #29/12 bpf_tcp_ca/multi_links:FAIL test_link_replace:PASS:open 0 nsec test_link_replace:FAIL:attach_struct_ops_1st unexpected error: -524 test_link_replace:FAIL:attach_struct_ops_2nd unexpected error: -524 #29/13 bpf_tcp_ca/link_replace:FAIL #29/14 bpf_tcp_ca/tcp_ca_kfunc:OK test_cc_cubic:PASS:bpf_cc_cubic__open_and_load 0 nsec test_cc_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/15 bpf_tcp_ca/cc_cubic:FAIL #29 bpf_tcp_ca:FAIL ''' Just like in ASSERT_OK(), this patch skips ENOTSUPP (524) and ENOTSUP (95) in ASSERT_OK_PTR() too. With this change, the new output of bpf_tcp_ca selftests look like: ''' #29/1 bpf_tcp_ca/dctcp:SKIP #29/2 bpf_tcp_ca/cubic:SKIP #29/3 bpf_tcp_ca/invalid_license:OK #29/4 bpf_tcp_ca/dctcp_fallback:SKIP #29/5 bpf_tcp_ca/rel_setsockopt:OK #29/6 bpf_tcp_ca/write_sk_pacing:SKIP #29/7 bpf_tcp_ca/incompl_cong_ops:OK #29/8 bpf_tcp_ca/unsupp_cong_op:OK #29/9 bpf_tcp_ca/update_ca:SKIP #29/10 bpf_tcp_ca/update_wrong:SKIP #29/11 bpf_tcp_ca/mixed_links:SKIP #29/12 bpf_tcp_ca/multi_links:SKIP #29/13 bpf_tcp_ca/link_replace:SKIP #29/14 bpf_tcp_ca/tcp_ca_kfunc:OK #29/15 bpf_tcp_ca/cc_cubic:SKIP #29 bpf_tcp_ca:OK (SKIP: 10/15) ''' Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

Run bpf_tcp_ca selftests (./test_progs -t bpf_tcp_ca) on a Loongarch platform, some "Segmentation fault" errors occur: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 settcpca:FAIL:setsockopt unexpected setsockopt: \ actual -1 == expected -1 (network_helpers.c:99: errno: No such file or directory) \ Failed to call post_socket_cb start_test:FAIL:start_server_str unexpected start_server_str: \ actual -1 == expected -1 test_update_ca:FAIL:ca1_ca1_cnt unexpected ca1_ca1_cnt: \ actual 0 <= expected 0 #29/9 bpf_tcp_ca/update_ca:FAIL #29 bpf_tcp_ca:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x5555567ed91c] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee408b0] ./test_progs(bpf_link__update_map+0x80)[0x555556824a78] ./test_progs(+0x94d68)[0x5555564c4d68] ./test_progs(test_bpf_tcp_ca+0xe8)[0x5555564c6a88] ./test_progs(+0x3bde54)[0x5555567ede54] ./test_progs(main+0x61c)[0x5555567efd54] /usr/lib64/libc.so.6(+0x22208)[0x7ffff2aaa208] /usr/lib64/libc.so.6(__libc_start_main+0xac)[0x7ffff2aaa30c] ./test_progs(_start+0x48)[0x55555646bca8] Segmentation fault ''' This is because "link" returned by bpf_map__attach_struct_ops() is NULL in this case. test_progs crashs when this NULL link passes to bpf_link__update_map(). This patch adds NULL checks for all links in bpf_tcp_ca to fix these errors. If "link" is NULL, goto the newly added label "err" to destroy the skel. v2: - use "goto err" instead of "return" as Eduard suggested. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>

Although the "Segmentation fault" errors are fixed in the last commit, run bpf_tcp_ca selftests (./test_progs -t bpf_tcp_ca) on a Loongarch platform, still some other "ENOTSUPP" (-524) errors left since lacking BPF trampoline on Loongarch: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL #29/3 bpf_tcp_ca/invalid_license:OK test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL #29/5 bpf_tcp_ca/rel_setsockopt:OK test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL #29/7 bpf_tcp_ca/incompl_cong_ops:OK #29/8 bpf_tcp_ca/unsupp_cong_op:OK test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 #29/9 bpf_tcp_ca/update_ca:FAIL test_update_wrong:PASS:open 0 nsec test_update_wrong:FAIL:attach_struct_ops unexpected error: -524 #29/10 bpf_tcp_ca/update_wrong:FAIL test_mixed_links:PASS:open 0 nsec test_mixed_links:FAIL:attach_struct_ops_nl unexpected error: -524 test_mixed_links:FAIL:attach_struct_ops unexpected error: -524 #29/11 bpf_tcp_ca/mixed_links:FAIL test_multi_links:PASS:open 0 nsec test_multi_links:FAIL:attach_struct_ops_1st unexpected error: -524 test_multi_links:FAIL:attach_struct_ops_2nd unexpected error: -524 #29/12 bpf_tcp_ca/multi_links:FAIL test_link_replace:PASS:open 0 nsec test_link_replace:FAIL:attach_struct_ops_1st unexpected error: -524 test_link_replace:FAIL:attach_struct_ops_2nd unexpected error: -524 #29/13 bpf_tcp_ca/link_replace:FAIL #29/14 bpf_tcp_ca/tcp_ca_kfunc:OK test_cc_cubic:PASS:bpf_cc_cubic__open_and_load 0 nsec test_cc_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/15 bpf_tcp_ca/cc_cubic:FAIL #29 bpf_tcp_ca:FAIL ''' Just like in ASSERT_OK(), this patch uses test_progs_get_error() helper to skip ENOTSUPP (524) and ENOTSUP (95) in ASSERT_OK_PTR() too. With this change, the new output of bpf_tcp_ca selftests look like: ''' #29/1 bpf_tcp_ca/dctcp:SKIP #29/2 bpf_tcp_ca/cubic:SKIP #29/3 bpf_tcp_ca/invalid_license:OK #29/4 bpf_tcp_ca/dctcp_fallback:SKIP #29/5 bpf_tcp_ca/rel_setsockopt:OK #29/6 bpf_tcp_ca/write_sk_pacing:SKIP #29/7 bpf_tcp_ca/incompl_cong_ops:OK #29/8 bpf_tcp_ca/unsupp_cong_op:OK #29/9 bpf_tcp_ca/update_ca:SKIP #29/10 bpf_tcp_ca/update_wrong:SKIP #29/11 bpf_tcp_ca/mixed_links:SKIP #29/12 bpf_tcp_ca/multi_links:SKIP #29/13 bpf_tcp_ca/link_replace:SKIP #29/14 bpf_tcp_ca/tcp_ca_kfunc:OK #29/15 bpf_tcp_ca/cc_cubic:SKIP #29 bpf_tcp_ca:OK (SKIP: 10/15) ''' Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>