• Kaike Wan's avatar
    IB/hfi1: Adjust flow PSN with the correct resync_psn · b2ff0d51
    Kaike Wan authored
    When a TID RDMA ACK to RESYNC request is received, the flow PSNs for
    pending TID RDMA WRITE segments will be adjusted with the next flow
    generation number, based on the resync_psn value extracted from the flow
    PSN of the TID RDMA ACK packet. The resync_psn value indicates the last
    flow PSN for which a TID RDMA WRITE DATA packet has been received by the
    responder and the requester should resend TID RDMA WRITE DATA packets,
    starting from the next flow PSN.
    
    However, if resync_psn points to the last flow PSN for a segment and the
    next segment flow PSN starts with a new generation number, use of the old
    resync_psn to adjust the flow PSN for the next segment will lead to
    miscalculation, resulting in WARN_ON and sge rewinding errors:
    
      WARNING: CPU: 4 PID: 146961 at /nfs/site/home/phcvs2/gitrepo/ifs-all/components/Drivers/tmp/rpmbuild/BUILD/ifs-kernel-updates-3.10.0_957.el7.x86_64/hfi1/tid_rdma.c:4764 hfi1_rc_rcv_tid_rdma_ack+0x8f6/0xa90 [hfi1]
      Modules linked in: ib_ipoib(OE) hfi1(OE) rdmavt(OE) rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfsv3 nfs_acl nfs lockd grace fscache iTCO_wdt iTCO_vendor_support skx_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm irqbypass crc32_pclmul ghash_clmulni_intel ib_isert iscsi_target_mod target_core_mod aesni_intel lrw gf128mul glue_helper ablk_helper cryptd rpcrdma sunrpc opa_vnic ast ttm ib_iser libiscsi drm_kms_helper scsi_transport_iscsi ipmi_ssif syscopyarea sysfillrect sysimgblt fb_sys_fops drm joydev ipmi_si pcspkr sg drm_panel_orientation_quirks ipmi_devintf lpc_ich i2c_i801 ipmi_msghandler wmi rdma_ucm ib_ucm ib_uverbs acpi_cpufreq acpi_power_meter ib_umad rdma_cm ib_cm iw_cm ip_tables ext4 mbcache jbd2 sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul i2c_algo_bit crct10dif_common
       crc32c_intel e1000e ib_core ahci libahci ptp libata pps_core nfit libnvdimm [last unloaded: rdmavt]
      CPU: 4 PID: 146961 Comm: kworker/4:0H Kdump: loaded Tainted: G        W  OE  ------------   3.10.0-957.el7.x86_64 #1
      Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.0X.02.0117.040420182310 04/04/2018
      Workqueue: hfi0_0 _hfi1_do_tid_send [hfi1]
      Call Trace:
       <IRQ>  [<ffffffff9e361dc1>] dump_stack+0x19/0x1b
       [<ffffffff9dc97648>] __warn+0xd8/0x100
       [<ffffffff9dc9778d>] warn_slowpath_null+0x1d/0x20
       [<ffffffffc05d28c6>] hfi1_rc_rcv_tid_rdma_ack+0x8f6/0xa90 [hfi1]
       [<ffffffffc05c21cc>] hfi1_kdeth_eager_rcv+0x1dc/0x210 [hfi1]
       [<ffffffffc05c23ef>] ? hfi1_kdeth_expected_rcv+0x1ef/0x210 [hfi1]
       [<ffffffffc0574f15>] kdeth_process_eager+0x35/0x90 [hfi1]
       [<ffffffffc0575b5a>] handle_receive_interrupt_nodma_rtail+0x17a/0x2b0 [hfi1]
       [<ffffffffc056a623>] receive_context_interrupt+0x23/0x40 [hfi1]
       [<ffffffff9dd4a294>] __handle_irq_event_percpu+0x44/0x1c0
       [<ffffffff9dd4a442>] handle_irq_event_percpu+0x32/0x80
       [<ffffffff9dd4a4cc>] handle_irq_event+0x3c/0x60
       [<ffffffff9dd4d27f>] handle_edge_irq+0x7f/0x150
       [<ffffffff9dc2e554>] handle_irq+0xe4/0x1a0
       [<ffffffff9e3795dd>] do_IRQ+0x4d/0xf0
       [<ffffffff9e36b362>] common_interrupt+0x162/0x162
       <EOI>  [<ffffffff9dfa0f79>] ? swiotlb_map_page+0x49/0x150
       [<ffffffffc05c2ed1>] hfi1_verbs_send_dma+0x291/0xb70 [hfi1]
       [<ffffffffc05c2c40>] ? hfi1_wait_kmem+0xf0/0xf0 [hfi1]
       [<ffffffffc05c3f26>] hfi1_verbs_send+0x126/0x2b0 [hfi1]
       [<ffffffffc05ce683>] _hfi1_do_tid_send+0x1d3/0x320 [hfi1]
       [<ffffffff9dcb9d4f>] process_one_work+0x17f/0x440
       [<ffffffff9dcbade6>] worker_thread+0x126/0x3c0
       [<ffffffff9dcbacc0>] ? manage_workers.isra.25+0x2a0/0x2a0
       [<ffffffff9dcc1c31>] kthread+0xd1/0xe0
       [<ffffffff9dcc1b60>] ? insert_kthread_work+0x40/0x40
       [<ffffffff9e374c1d>] ret_from_fork_nospec_begin+0x7/0x21
       [<ffffffff9dcc1b60>] ? insert_kthread_work+0x40/0x40
    
    This patch fixes the issue by adjusting the resync_psn first if the flow
    generation has been advanced for a pending segment.
    
    Fixes: 9e93e967 ("IB/hfi1: Add a function to receive TID RDMA ACK packet")
    Link: https://lore.kernel.org/r/20191219231920.51069.37147.stgit@awfm-01.aw.intel.com
    Cc: <stable@vger.kernel.org>
    Reviewed-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
    Signed-off-by: default avatarKaike Wan <kaike.wan@intel.com>
    Signed-off-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
    Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
    b2ff0d51
tid_rdma.c 157 KB