From 0181ce31b26021f7c2f9506112a05c847a36f0f2 Mon Sep 17 00:00:00 2001 From: Don Hiatt Date: Mon, 20 Mar 2017 17:26:14 -0700 Subject: [PATCH] IB/hfi1: Add receive fault injection feature Add fault injection capability: - Drop packets unconditionally (fault_by_packet) - Drop packets based on opcode (fault_by_opcode) This feature reacts to the global FAULT_INJECTION config flag. The faulting traces have been added: - misc/fault_opcode - misc/fault_packet See 'Documentation/fault-injection/fault-injection.txt' for details. Examples: - Dropping packets by opcode: /sys/kernel/debug/hfi1/hfi1_X/fault_opcode # Enable fault echo Y > fault_by_opcode # Setprobability of dropping (0-100%) # echo 25 > probability # Set opcode echo 0x64 > opcode # Number of times to fault echo 3 > times # An optional mask allows you to fault # a range of opcodes echo 0xf0 > mask /sys/kernel/debug/hfi1/hfi1_X/fault_stats contains a value in parentheses to indicate number of each opcode dropped. - Dropping packets unconditionally /sys/kernel/debug/hfi1/hfi1_X/fault_packet # Enable fault echo Y > fault_by_packet /sys/kernel/debug/hfi1/hfi1_X/fault_packet/fault_stats contains the number of packets dropped. Reviewed-by: Dennis Dalessandro Signed-off-by: Mike Marciniszyn Signed-off-by: Don Hiatt Signed-off-by: Dennis Dalessandro Signed-off-by: Doug Ledford --- drivers/infiniband/hw/hfi1/debugfs.c | 222 ++++++++++++++++++++++++ drivers/infiniband/hw/hfi1/debugfs.h | 51 +++++- drivers/infiniband/hw/hfi1/driver.c | 8 + drivers/infiniband/hw/hfi1/trace_misc.h | 48 +++++ drivers/infiniband/hw/hfi1/verbs.c | 6 + drivers/infiniband/hw/hfi1/verbs.h | 4 + 6 files changed, 336 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/debugfs.c b/drivers/infiniband/hw/hfi1/debugfs.c index 7fe9dd885746..cac6d5256f40 100644 --- a/drivers/infiniband/hw/hfi1/debugfs.c +++ b/drivers/infiniband/hw/hfi1/debugfs.c @@ -51,8 +51,12 @@ #include #include #include +#include +#include +#include #include "hfi.h" +#include "trace.h" #include "debugfs.h" #include "device.h" #include "qp.h" @@ -1063,6 +1067,217 @@ DEBUGFS_SEQ_FILE_OPS(sdma_cpu_list); DEBUGFS_SEQ_FILE_OPEN(sdma_cpu_list) DEBUGFS_FILE_OPS(sdma_cpu_list); +#ifdef CONFIG_FAULT_INJECTION +static void *_fault_stats_seq_start(struct seq_file *s, loff_t *pos) +{ + struct hfi1_opcode_stats_perctx *opstats; + + if (*pos >= ARRAY_SIZE(opstats->stats)) + return NULL; + return pos; +} + +static void *_fault_stats_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct hfi1_opcode_stats_perctx *opstats; + + ++*pos; + if (*pos >= ARRAY_SIZE(opstats->stats)) + return NULL; + return pos; +} + +static void _fault_stats_seq_stop(struct seq_file *s, void *v) +{ +} + +static int _fault_stats_seq_show(struct seq_file *s, void *v) +{ + loff_t *spos = v; + loff_t i = *spos, j; + u64 n_packets = 0, n_bytes = 0; + struct hfi1_ibdev *ibd = (struct hfi1_ibdev *)s->private; + struct hfi1_devdata *dd = dd_from_dev(ibd); + + for (j = 0; j < dd->first_user_ctxt; j++) { + if (!dd->rcd[j]) + continue; + n_packets += dd->rcd[j]->opstats->stats[i].n_packets; + n_bytes += dd->rcd[j]->opstats->stats[i].n_bytes; + } + if (!n_packets && !n_bytes) + return SEQ_SKIP; + if (!ibd->fault_opcode->n_rxfaults[i] && + !ibd->fault_opcode->n_txfaults[i]) + return SEQ_SKIP; + seq_printf(s, "%02llx %llu/%llu (faults rx:%llu faults: tx:%llu)\n", i, + (unsigned long long)n_packets, + (unsigned long long)n_bytes, + (unsigned long long)ibd->fault_opcode->n_rxfaults[i], + (unsigned long long)ibd->fault_opcode->n_txfaults[i]); + return 0; +} + +DEBUGFS_SEQ_FILE_OPS(fault_stats); +DEBUGFS_SEQ_FILE_OPEN(fault_stats); +DEBUGFS_FILE_OPS(fault_stats); + +static void fault_exit_opcode_debugfs(struct hfi1_ibdev *ibd) +{ + debugfs_remove_recursive(ibd->fault_opcode->dir); + kfree(ibd->fault_opcode); + ibd->fault_opcode = NULL; +} + +static int fault_init_opcode_debugfs(struct hfi1_ibdev *ibd) +{ + struct dentry *parent = ibd->hfi1_ibdev_dbg; + + ibd->fault_opcode = kzalloc(sizeof(*ibd->fault_opcode), GFP_KERNEL); + if (!ibd->fault_opcode) + return -ENOMEM; + + ibd->fault_opcode->attr.interval = 1; + ibd->fault_opcode->attr.require_end = ULONG_MAX; + ibd->fault_opcode->attr.stacktrace_depth = 32; + ibd->fault_opcode->attr.dname = NULL; + ibd->fault_opcode->attr.verbose = 0; + ibd->fault_opcode->fault_by_opcode = false; + ibd->fault_opcode->opcode = 0; + ibd->fault_opcode->mask = 0xff; + + ibd->fault_opcode->dir = + fault_create_debugfs_attr("fault_opcode", + parent, + &ibd->fault_opcode->attr); + if (IS_ERR(ibd->fault_opcode->dir)) { + kfree(ibd->fault_opcode); + return -ENOENT; + } + + DEBUGFS_SEQ_FILE_CREATE(fault_stats, ibd->fault_opcode->dir, ibd); + if (!debugfs_create_bool("fault_by_opcode", 0600, + ibd->fault_opcode->dir, + &ibd->fault_opcode->fault_by_opcode)) + goto fail; + if (!debugfs_create_x8("opcode", 0600, ibd->fault_opcode->dir, + &ibd->fault_opcode->opcode)) + goto fail; + if (!debugfs_create_x8("mask", 0600, ibd->fault_opcode->dir, + &ibd->fault_opcode->mask)) + goto fail; + + return 0; +fail: + fault_exit_opcode_debugfs(ibd); + return -ENOMEM; +} + +static void fault_exit_packet_debugfs(struct hfi1_ibdev *ibd) +{ + debugfs_remove_recursive(ibd->fault_packet->dir); + kfree(ibd->fault_packet); + ibd->fault_packet = NULL; +} + +static int fault_init_packet_debugfs(struct hfi1_ibdev *ibd) +{ + struct dentry *parent = ibd->hfi1_ibdev_dbg; + + ibd->fault_packet = kzalloc(sizeof(*ibd->fault_packet), GFP_KERNEL); + if (!ibd->fault_packet) + return -ENOMEM; + + ibd->fault_packet->attr.interval = 1; + ibd->fault_packet->attr.require_end = ULONG_MAX; + ibd->fault_packet->attr.stacktrace_depth = 32; + ibd->fault_packet->attr.dname = NULL; + ibd->fault_packet->attr.verbose = 0; + ibd->fault_packet->fault_by_packet = false; + + ibd->fault_packet->dir = + fault_create_debugfs_attr("fault_packet", + parent, + &ibd->fault_opcode->attr); + if (IS_ERR(ibd->fault_packet->dir)) { + kfree(ibd->fault_packet); + return -ENOENT; + } + + if (!debugfs_create_bool("fault_by_packet", 0600, + ibd->fault_packet->dir, + &ibd->fault_packet->fault_by_packet)) + goto fail; + if (!debugfs_create_u64("fault_stats", 0400, + ibd->fault_packet->dir, + &ibd->fault_packet->n_faults)) + goto fail; + + return 0; +fail: + fault_exit_packet_debugfs(ibd); + return -ENOMEM; +} + +static void fault_exit_debugfs(struct hfi1_ibdev *ibd) +{ + fault_exit_opcode_debugfs(ibd); + fault_exit_packet_debugfs(ibd); +} + +static int fault_init_debugfs(struct hfi1_ibdev *ibd) +{ + int ret = 0; + + ret = fault_init_opcode_debugfs(ibd); + if (ret) + return ret; + + ret = fault_init_packet_debugfs(ibd); + if (ret) + fault_exit_opcode_debugfs(ibd); + + return ret; +} + +bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, u32 opcode, bool rx) +{ + bool ret = false; + struct hfi1_ibdev *ibd = to_idev(qp->ibqp.device); + + if (!ibd->fault_opcode || !ibd->fault_opcode->fault_by_opcode) + return false; + if (ibd->fault_opcode->opcode != (opcode & ibd->fault_opcode->mask)) + return false; + ret = should_fail(&ibd->fault_opcode->attr, 1); + if (ret) { + trace_hfi1_fault_opcode(qp, opcode); + if (rx) + ibd->fault_opcode->n_rxfaults[opcode]++; + else + ibd->fault_opcode->n_txfaults[opcode]++; + } + return ret; +} + +bool hfi1_dbg_fault_packet(struct hfi1_packet *packet) +{ + struct rvt_dev_info *rdi = &packet->rcd->ppd->dd->verbs_dev.rdi; + struct hfi1_ibdev *ibd = dev_from_rdi(rdi); + bool ret = false; + + if (!ibd->fault_packet || !ibd->fault_packet->fault_by_packet) + return false; + + ret = should_fail(&ibd->fault_packet->attr, 1); + if (ret) { + ++ibd->fault_packet->n_faults; + trace_hfi1_fault_packet(packet); + } + return ret; +} +#endif + void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd) { char name[sizeof("port0counters") + 1]; @@ -1112,12 +1327,19 @@ void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd) !port_cntr_ops[i].ops.write ? S_IRUGO : S_IRUGO | S_IWUSR); } + +#ifdef CONFIG_FAULT_INJECTION + fault_init_debugfs(ibd); +#endif } void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd) { if (!hfi1_dbg_root) goto out; +#ifdef CONFIG_FAULT_INJECTION + fault_exit_debugfs(ibd); +#endif debugfs_remove(ibd->hfi1_ibdev_link); debugfs_remove_recursive(ibd->hfi1_ibdev_dbg); out: diff --git a/drivers/infiniband/hw/hfi1/debugfs.h b/drivers/infiniband/hw/hfi1/debugfs.h index b6fb6814f1b8..70be5ca14736 100644 --- a/drivers/infiniband/hw/hfi1/debugfs.h +++ b/drivers/infiniband/hw/hfi1/debugfs.h @@ -53,23 +53,68 @@ void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd); void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd); void hfi1_dbg_init(void); void hfi1_dbg_exit(void); + +#ifdef CONFIG_FAULT_INJECTION +#include +struct fault_opcode { + struct fault_attr attr; + struct dentry *dir; + bool fault_by_opcode; + u64 n_rxfaults[256]; + u64 n_txfaults[256]; + u8 opcode; + u8 mask; +}; + +struct fault_packet { + struct fault_attr attr; + struct dentry *dir; + bool fault_by_packet; + u64 n_faults; +}; + +bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, u32 opcode, bool rx); +bool hfi1_dbg_fault_packet(struct hfi1_packet *packet); +#else +static inline bool hfi1_dbg_fault_packet(struct hfi1_packet *packet) +{ + return false; +} + +static inline bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, + u32 opcode, bool rx) +{ + return false; +} +#endif + #else static inline void hfi1_dbg_ibdev_init(struct hfi1_ibdev *ibd) { } -void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd) +static inline void hfi1_dbg_ibdev_exit(struct hfi1_ibdev *ibd) +{ +} + +static inline void hfi1_dbg_init(void) { } -void hfi1_dbg_init(void) +static inline void hfi1_dbg_exit(void) { } -void hfi1_dbg_exit(void) +static inline bool hfi1_dbg_fault_packet(struct hfi1_packet *packet) { + return false; } +static inline bool hfi1_dbg_fault_opcode(struct rvt_qp *qp, + u32 opcode, bool rx) +{ + return false; +} #endif #endif /* _HFI1_DEBUGFS_H */ diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c index 3881c951f6af..c0b012f6e11c 100644 --- a/drivers/infiniband/hw/hfi1/driver.c +++ b/drivers/infiniband/hw/hfi1/driver.c @@ -59,6 +59,7 @@ #include "trace.h" #include "qp.h" #include "sdma.h" +#include "debugfs.h" #undef pr_fmt #define pr_fmt(fmt) DRIVER_NAME ": " fmt @@ -1354,6 +1355,9 @@ void handle_eflags(struct hfi1_packet *packet) */ int process_receive_ib(struct hfi1_packet *packet) { + if (unlikely(hfi1_dbg_fault_packet(packet))) + return RHF_RCV_CONTINUE; + trace_hfi1_rcvhdr(packet->rcd->ppd->dd, packet->rcd->ctxt, rhf_err_flags(packet->rhf), @@ -1409,6 +1413,8 @@ int process_receive_error(struct hfi1_packet *packet) int kdeth_process_expected(struct hfi1_packet *packet) { + if (unlikely(hfi1_dbg_fault_packet(packet))) + return RHF_RCV_CONTINUE; if (unlikely(rhf_err_flags(packet->rhf))) handle_eflags(packet); @@ -1421,6 +1427,8 @@ int kdeth_process_eager(struct hfi1_packet *packet) { if (unlikely(rhf_err_flags(packet->rhf))) handle_eflags(packet); + if (unlikely(hfi1_dbg_fault_packet(packet))) + return RHF_RCV_CONTINUE; dd_dev_err(packet->rcd->dd, "Unhandled eager packet received. Dropping.\n"); diff --git a/drivers/infiniband/hw/hfi1/trace_misc.h b/drivers/infiniband/hw/hfi1/trace_misc.h index d308454af7fd..deac77ddaeab 100644 --- a/drivers/infiniband/hw/hfi1/trace_misc.h +++ b/drivers/infiniband/hw/hfi1/trace_misc.h @@ -72,6 +72,54 @@ TRACE_EVENT(hfi1_interrupt, __entry->src) ); +#ifdef CONFIG_FAULT_INJECTION +TRACE_EVENT(hfi1_fault_opcode, + TP_PROTO(struct rvt_qp *qp, u8 opcode), + TP_ARGS(qp, opcode), + TP_STRUCT__entry(DD_DEV_ENTRY(dd_from_ibdev(qp->ibqp.device)) + __field(u32, qpn) + __field(u8, opcode) + ), + TP_fast_assign(DD_DEV_ASSIGN(dd_from_ibdev(qp->ibqp.device)) + __entry->qpn = qp->ibqp.qp_num; + __entry->opcode = opcode; + ), + TP_printk("[%s] qpn 0x%x opcode 0x%x", + __get_str(dev), __entry->qpn, __entry->opcode) +); + +TRACE_EVENT(hfi1_fault_packet, + TP_PROTO(struct hfi1_packet *packet), + TP_ARGS(packet), + TP_STRUCT__entry(DD_DEV_ENTRY(packet->rcd->ppd->dd) + __field(u64, eflags) + __field(u32, ctxt) + __field(u32, hlen) + __field(u32, tlen) + __field(u32, updegr) + __field(u32, etail) + ), + TP_fast_assign(DD_DEV_ASSIGN(packet->rcd->ppd->dd); + __entry->eflags = rhf_err_flags(packet->rhf); + __entry->ctxt = packet->rcd->ctxt; + __entry->hlen = packet->hlen; + __entry->tlen = packet->tlen; + __entry->updegr = packet->updegr; + __entry->etail = rhf_egr_index(packet->rhf); + ), + TP_printk( + "[%s] ctxt %d eflags 0x%llx hlen %d tlen %d updegr %d etail %d", + __get_str(dev), + __entry->ctxt, + __entry->eflags, + __entry->hlen, + __entry->tlen, + __entry->updegr, + __entry->etail + ) +); +#endif + #endif /* __HFI1_TRACE_MISC_H */ #undef TRACE_INCLUDE_PATH diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c index 928918cc7d80..9f016daba256 100644 --- a/drivers/infiniband/hw/hfi1/verbs.c +++ b/drivers/infiniband/hw/hfi1/verbs.c @@ -60,6 +60,7 @@ #include "trace.h" #include "qp.h" #include "verbs_txreq.h" +#include "debugfs.h" static unsigned int hfi1_lkey_table_size = 16; module_param_named(lkey_table_size, hfi1_lkey_table_size, uint, @@ -599,6 +600,11 @@ void hfi1_ib_rcv(struct hfi1_packet *packet) rcu_read_unlock(); goto drop; } + if (unlikely(hfi1_dbg_fault_opcode(packet->qp, opcode, + true))) { + rcu_read_unlock(); + goto drop; + } spin_lock_irqsave(&packet->qp->r_lock, flags); packet_handler = qp_ok(opcode, packet); if (likely(packet_handler)) diff --git a/drivers/infiniband/hw/hfi1/verbs.h b/drivers/infiniband/hw/hfi1/verbs.h index 3a0b589e41c2..2756ec35b054 100644 --- a/drivers/infiniband/hw/hfi1/verbs.h +++ b/drivers/infiniband/hw/hfi1/verbs.h @@ -195,6 +195,10 @@ struct hfi1_ibdev { struct dentry *hfi1_ibdev_dbg; /* per HFI symlinks to above */ struct dentry *hfi1_ibdev_link; +#ifdef CONFIG_FAULT_INJECTION + struct fault_opcode *fault_opcode; + struct fault_packet *fault_packet; +#endif #endif }; -- 2.20.1