| From 00bc1c7c6918698311f29ecf597d53b8c9888781 Mon Sep 17 00:00:00 2001 |
| From: Kaike Wan <kaike.wan@intel.com> |
| Date: Thu, 19 Dec 2019 18:19:20 -0500 |
| Subject: [PATCH] IB/hfi1: Adjust flow PSN with the correct resync_psn |
| |
| commit b2ff0d510182eb5cc05a65d1b2371af62c4b170c upstream. |
| |
| 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: 9e93e967f7b4 ("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: Mike Marciniszyn <mike.marciniszyn@intel.com> |
| Signed-off-by: Kaike Wan <kaike.wan@intel.com> |
| Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> |
| Signed-off-by: Jason Gunthorpe <jgg@mellanox.com> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.c b/drivers/infiniband/hw/hfi1/tid_rdma.c |
| index 50ddb6d3aefa..c781038bd5c1 100644 |
| --- a/drivers/infiniband/hw/hfi1/tid_rdma.c |
| +++ b/drivers/infiniband/hw/hfi1/tid_rdma.c |
| @@ -4627,6 +4627,15 @@ void hfi1_rc_rcv_tid_rdma_ack(struct hfi1_packet *packet) |
| */ |
| fpsn = full_flow_psn(flow, flow->flow_state.spsn); |
| req->r_ack_psn = psn; |
| + /* |
| + * If resync_psn points to the last flow PSN for a |
| + * segment and the new segment (likely from a new |
| + * request) starts with a new generation number, we |
| + * need to adjust resync_psn accordingly. |
| + */ |
| + if (flow->flow_state.generation != |
| + (resync_psn >> HFI1_KDETH_BTH_SEQ_SHIFT)) |
| + resync_psn = mask_psn(fpsn - 1); |
| flow->resync_npkts += |
| delta_psn(mask_psn(resync_psn + 1), fpsn); |
| /* |
| -- |
| 2.7.4 |
| |
