From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Benjamin Marzinski Date: Wed, 13 Apr 2022 23:27:38 -0500 Subject: [PATCH] libmultipath: Set the scsi timeout parameters by path Instead of dev_loss, fast_io_fail, and eh_deadline belonging to the multipath structure, have them belong to the path structure. This means that they are selected per path, and that sysfs_set_scsi_tmo() doesn't assume that all paths of a multipath device will have the same value. Currently they will all be the same, but a future patch will make it possible for paths to have different values based on their protocol. Signed-off-by: Benjamin Marzinski Reviewed-by: Martin Wilck --- libmultipath/configure.c | 5 +- libmultipath/discovery.c | 149 +++++++++++++++++++++++---------------- libmultipath/discovery.h | 2 +- libmultipath/propsel.c | 42 +++++------ libmultipath/propsel.h | 6 +- libmultipath/structs.c | 1 - libmultipath/structs.h | 6 +- 7 files changed, 118 insertions(+), 93 deletions(-) diff --git a/libmultipath/configure.c b/libmultipath/configure.c index 9a9890f5..6cad0468 100644 --- a/libmultipath/configure.c +++ b/libmultipath/configure.c @@ -338,9 +338,6 @@ int setup_map(struct multipath *mpp, char *params, int params_size, select_mode(conf, mpp); select_uid(conf, mpp); select_gid(conf, mpp); - select_fast_io_fail(conf, mpp); - select_dev_loss(conf, mpp); - select_eh_deadline(conf, mpp); select_reservation_key(conf, mpp); select_deferred_remove(conf, mpp); select_marginal_path_err_sample_time(conf, mpp); @@ -356,7 +353,7 @@ int setup_map(struct multipath *mpp, char *params, int params_size, select_ghost_delay(conf, mpp); select_flush_on_last_del(conf, mpp); - sysfs_set_scsi_tmo(mpp, conf->checkint); + sysfs_set_scsi_tmo(conf, mpp); marginal_pathgroups = conf->marginal_pathgroups; pthread_cleanup_pop(1); diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c index 2404cb87..36cc389e 100644 --- a/libmultipath/discovery.c +++ b/libmultipath/discovery.c @@ -581,13 +581,13 @@ sysfs_get_asymmetric_access_state(struct path *pp, char *buff, int buflen) } static int -sysfs_set_eh_deadline(struct multipath *mpp, struct path *pp) +sysfs_set_eh_deadline(struct path *pp) { struct udev_device *hostdev; char host_name[HOST_NAME_LEN], value[16]; int ret; - if (mpp->eh_deadline == EH_DEADLINE_UNSET) + if (pp->eh_deadline == EH_DEADLINE_UNSET) return 0; sprintf(host_name, "host%d", pp->sg_id.host_no); @@ -596,12 +596,12 @@ sysfs_set_eh_deadline(struct multipath *mpp, struct path *pp) if (!hostdev) return 1; - if (mpp->eh_deadline == EH_DEADLINE_OFF) + if (pp->eh_deadline == EH_DEADLINE_OFF) sprintf(value, "off"); - else if (mpp->eh_deadline == EH_DEADLINE_ZERO) + else if (pp->eh_deadline == EH_DEADLINE_ZERO) sprintf(value, "0"); else - snprintf(value, 16, "%u", mpp->eh_deadline); + snprintf(value, 16, "%u", pp->eh_deadline); ret = sysfs_attr_set_value(hostdev, "eh_deadline", value, strlen(value)); @@ -625,6 +625,9 @@ sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp) unsigned int tmo; int ret; + if (!pp->dev_loss && pp->fast_io_fail == MP_FAST_IO_FAIL_UNSET) + return; + sprintf(rport_id, "rport-%d:%d-%d", pp->sg_id.host_no, pp->sg_id.channel, pp->sg_id.transport_id); rport_dev = udev_device_new_from_subsystem_sysname(udev, @@ -664,14 +667,14 @@ sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp) * then set fast_io_fail, and _then_ set dev_loss_tmo * to the correct value. */ - if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET && - mpp->fast_io_fail != MP_FAST_IO_FAIL_ZERO && - mpp->fast_io_fail != MP_FAST_IO_FAIL_OFF) { + if (pp->fast_io_fail != MP_FAST_IO_FAIL_UNSET && + pp->fast_io_fail != MP_FAST_IO_FAIL_ZERO && + pp->fast_io_fail != MP_FAST_IO_FAIL_OFF) { /* Check if we need to temporarily increase dev_loss_tmo */ - if ((unsigned int)mpp->fast_io_fail >= tmo) { + if ((unsigned int)pp->fast_io_fail >= tmo) { /* Increase dev_loss_tmo temporarily */ snprintf(value, sizeof(value), "%u", - (unsigned int)mpp->fast_io_fail + 1); + (unsigned int)pp->fast_io_fail + 1); ret = sysfs_attr_set_value(rport_dev, "dev_loss_tmo", value, strlen(value)); if (ret <= 0) { @@ -685,20 +688,20 @@ sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp) goto out; } } - } else if (mpp->dev_loss > DEFAULT_DEV_LOSS_TMO && - mpp->no_path_retry != NO_PATH_RETRY_QUEUE) { + } else if (pp->dev_loss > DEFAULT_DEV_LOSS_TMO && + mpp->no_path_retry != NO_PATH_RETRY_QUEUE) { condlog(3, "%s: limiting dev_loss_tmo to %d, since " "fast_io_fail is not set", rport_id, DEFAULT_DEV_LOSS_TMO); - mpp->dev_loss = DEFAULT_DEV_LOSS_TMO; + pp->dev_loss = DEFAULT_DEV_LOSS_TMO; } - if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) { - if (mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF) + if (pp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) { + if (pp->fast_io_fail == MP_FAST_IO_FAIL_OFF) sprintf(value, "off"); - else if (mpp->fast_io_fail == MP_FAST_IO_FAIL_ZERO) + else if (pp->fast_io_fail == MP_FAST_IO_FAIL_ZERO) sprintf(value, "0"); else - snprintf(value, 16, "%u", mpp->fast_io_fail); + snprintf(value, 16, "%u", pp->fast_io_fail); ret = sysfs_attr_set_value(rport_dev, "fast_io_fail_tmo", value, strlen(value)); if (ret <= 0) { @@ -709,8 +712,8 @@ sysfs_set_rport_tmo(struct multipath *mpp, struct path *pp) rport_id, value, -ret); } } - if (mpp->dev_loss > 0) { - snprintf(value, 16, "%u", mpp->dev_loss); + if (pp->dev_loss > 0) { + snprintf(value, 16, "%u", pp->dev_loss); ret = sysfs_attr_set_value(rport_dev, "dev_loss_tmo", value, strlen(value)); if (ret <= 0) { @@ -726,7 +729,7 @@ out: } static void -sysfs_set_session_tmo(struct multipath *mpp, struct path *pp) +sysfs_set_session_tmo(struct path *pp) { struct udev_device *session_dev = NULL; char session_id[64]; @@ -743,18 +746,18 @@ sysfs_set_session_tmo(struct multipath *mpp, struct path *pp) condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no, pp->sg_id.channel, pp->sg_id.scsi_id, session_id); - if (mpp->dev_loss) { + if (pp->dev_loss) { condlog(3, "%s: ignoring dev_loss_tmo on iSCSI", pp->dev); } - if (mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) { - if (mpp->fast_io_fail == MP_FAST_IO_FAIL_OFF) { + if (pp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) { + if (pp->fast_io_fail == MP_FAST_IO_FAIL_OFF) { condlog(3, "%s: can't switch off fast_io_fail_tmo " "on iSCSI", pp->dev); - } else if (mpp->fast_io_fail == MP_FAST_IO_FAIL_ZERO) { + } else if (pp->fast_io_fail == MP_FAST_IO_FAIL_ZERO) { condlog(3, "%s: can't set fast_io_fail_tmo to '0'" "on iSCSI", pp->dev); } else { - snprintf(value, 11, "%u", mpp->fast_io_fail); + snprintf(value, 11, "%u", pp->fast_io_fail); if (sysfs_attr_set_value(session_dev, "recovery_tmo", value, strlen(value)) <= 0) { condlog(3, "%s: Failed to set recovery_tmo, " @@ -767,12 +770,15 @@ sysfs_set_session_tmo(struct multipath *mpp, struct path *pp) } static void -sysfs_set_nexus_loss_tmo(struct multipath *mpp, struct path *pp) +sysfs_set_nexus_loss_tmo(struct path *pp) { struct udev_device *sas_dev = NULL; char end_dev_id[64]; char value[11]; + if (!pp->udev || !pp->dev_loss) + return; + sprintf(end_dev_id, "end_device-%d:%d", pp->sg_id.host_no, pp->sg_id.transport_id); sas_dev = udev_device_new_from_subsystem_sysname(udev, @@ -785,8 +791,8 @@ sysfs_set_nexus_loss_tmo(struct multipath *mpp, struct path *pp) condlog(4, "target%d:%d:%d -> %s", pp->sg_id.host_no, pp->sg_id.channel, pp->sg_id.scsi_id, end_dev_id); - if (mpp->dev_loss) { - snprintf(value, 11, "%u", mpp->dev_loss); + if (pp->dev_loss) { + snprintf(value, 11, "%u", pp->dev_loss); if (sysfs_attr_set_value(sas_dev, "I_T_nexus_loss_timeout", value, strlen(value)) <= 0) condlog(3, "%s: failed to update " @@ -798,53 +804,76 @@ sysfs_set_nexus_loss_tmo(struct multipath *mpp, struct path *pp) } int -sysfs_set_scsi_tmo (struct multipath *mpp, unsigned int checkint) +sysfs_set_scsi_tmo (struct config *conf, struct multipath *mpp) { struct path *pp; int i; - unsigned int dev_loss_tmo = mpp->dev_loss; + unsigned int min_dev_loss = 0; + bool warn_dev_loss = false; + bool warn_fast_io_fail = false; if (mpp->no_path_retry > 0) { uint64_t no_path_retry_tmo = - (uint64_t)mpp->no_path_retry * checkint; + (uint64_t)mpp->no_path_retry * conf->checkint; if (no_path_retry_tmo > MAX_DEV_LOSS_TMO) - no_path_retry_tmo = MAX_DEV_LOSS_TMO; - if (no_path_retry_tmo > dev_loss_tmo) - dev_loss_tmo = no_path_retry_tmo; - condlog(3, "%s: update dev_loss_tmo to %u", - mpp->alias, dev_loss_tmo); - } else if (mpp->no_path_retry == NO_PATH_RETRY_QUEUE) { - dev_loss_tmo = MAX_DEV_LOSS_TMO; - condlog(3, "%s: update dev_loss_tmo to %u", - mpp->alias, dev_loss_tmo); - } - mpp->dev_loss = dev_loss_tmo; - if (mpp->dev_loss && mpp->fast_io_fail > 0 && - (unsigned int)mpp->fast_io_fail >= mpp->dev_loss) { - condlog(3, "%s: turning off fast_io_fail (%d is not smaller than dev_loss_tmo)", - mpp->alias, mpp->fast_io_fail); - mpp->fast_io_fail = MP_FAST_IO_FAIL_OFF; - } - if (!mpp->dev_loss && mpp->fast_io_fail == MP_FAST_IO_FAIL_UNSET && - mpp->eh_deadline == EH_DEADLINE_UNSET) - return 0; + min_dev_loss = MAX_DEV_LOSS_TMO; + else + min_dev_loss = no_path_retry_tmo; + } else if (mpp->no_path_retry == NO_PATH_RETRY_QUEUE) + min_dev_loss = MAX_DEV_LOSS_TMO; vector_foreach_slot(mpp->paths, pp, i) { + select_fast_io_fail(conf, pp); + select_dev_loss(conf, pp); + select_eh_deadline(conf, pp); + + if (!pp->dev_loss && pp->eh_deadline == EH_DEADLINE_UNSET && + pp->fast_io_fail == MP_FAST_IO_FAIL_UNSET) + continue; + if (pp->bus != SYSFS_BUS_SCSI) continue; + sysfs_set_eh_deadline(pp); + + if (!pp->dev_loss && pp->fast_io_fail == MP_FAST_IO_FAIL_UNSET) + continue; + + if (pp->sg_id.proto_id != SCSI_PROTOCOL_FCP && + pp->sg_id.proto_id != SCSI_PROTOCOL_ISCSI && + pp->sg_id.proto_id != SCSI_PROTOCOL_SAS) + continue; + + if (pp->dev_loss > 0 && pp->dev_loss < min_dev_loss) { + warn_dev_loss = true; + pp->dev_loss = min_dev_loss; + } + if (pp->dev_loss > 0 && pp->fast_io_fail > 0 && + (unsigned int)pp->fast_io_fail >= pp->dev_loss) { + warn_fast_io_fail = true; + pp->fast_io_fail = MP_FAST_IO_FAIL_OFF; + } - if (mpp->dev_loss || - mpp->fast_io_fail != MP_FAST_IO_FAIL_UNSET) { - if (pp->sg_id.proto_id == SCSI_PROTOCOL_FCP) - sysfs_set_rport_tmo(mpp, pp); - else if (pp->sg_id.proto_id == SCSI_PROTOCOL_ISCSI) - sysfs_set_session_tmo(mpp, pp); - else if (pp->sg_id.proto_id == SCSI_PROTOCOL_SAS) - sysfs_set_nexus_loss_tmo(mpp, pp); + switch (pp->sg_id.proto_id) { + case SCSI_PROTOCOL_FCP: + sysfs_set_rport_tmo(mpp, pp); + break; + case SCSI_PROTOCOL_ISCSI: + sysfs_set_session_tmo(pp); + break; + case SCSI_PROTOCOL_SAS: + sysfs_set_nexus_loss_tmo(pp); + break; + default: + break; } - sysfs_set_eh_deadline(mpp, pp); } + if (warn_dev_loss) + condlog(2, "%s: Raising dev_loss_tmo to %u because of no_path_retry setting", + mpp->alias, min_dev_loss); + if (warn_fast_io_fail) + condlog(3, "%s: turning off fast_io_fail (not smaller than dev_loss_tmo)", + mpp->alias); return 0; } diff --git a/libmultipath/discovery.h b/libmultipath/discovery.h index a5446b4d..b6eea258 100644 --- a/libmultipath/discovery.h +++ b/libmultipath/discovery.h @@ -42,7 +42,7 @@ int alloc_path_with_pathinfo (struct config *conf, struct udev_device *udevice, int store_pathinfo (vector pathvec, struct config *conf, struct udev_device *udevice, int flag, struct path **pp_ptr); -int sysfs_set_scsi_tmo (struct multipath *mpp, unsigned int checkint); +int sysfs_set_scsi_tmo (struct config *conf, struct multipath *mpp); int sysfs_get_timeout(const struct path *pp, unsigned int *timeout); int sysfs_get_host_pci_name(const struct path *pp, char *pci_name); int sysfs_get_iscsi_ip_address(const struct path *pp, char *ip_address); diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c index 127b3370..25326eb6 100644 --- a/libmultipath/propsel.c +++ b/libmultipath/propsel.c @@ -766,51 +766,51 @@ int select_minio(struct config *conf, struct multipath *mp) return select_minio_bio(conf, mp); } -int select_fast_io_fail(struct config *conf, struct multipath *mp) +int select_fast_io_fail(struct config *conf, struct path *pp) { const char *origin; char buff[12]; - mp_set_ovr(fast_io_fail); - mp_set_hwe(fast_io_fail); - mp_set_conf(fast_io_fail); - mp_set_default(fast_io_fail, DEFAULT_FAST_IO_FAIL); + pp_set_ovr(fast_io_fail); + pp_set_hwe(fast_io_fail); + pp_set_conf(fast_io_fail); + pp_set_default(fast_io_fail, DEFAULT_FAST_IO_FAIL); out: - print_undef_off_zero(buff, 12, mp->fast_io_fail); - condlog(3, "%s: fast_io_fail_tmo = %s %s", mp->alias, buff, origin); + print_undef_off_zero(buff, 12, pp->fast_io_fail); + condlog(3, "%s: fast_io_fail_tmo = %s %s", pp->dev, buff, origin); return 0; } -int select_dev_loss(struct config *conf, struct multipath *mp) +int select_dev_loss(struct config *conf, struct path *pp) { const char *origin; char buff[12]; - mp_set_ovr(dev_loss); - mp_set_hwe(dev_loss); - mp_set_conf(dev_loss); - mp->dev_loss = 0; + pp_set_ovr(dev_loss); + pp_set_hwe(dev_loss); + pp_set_conf(dev_loss); + pp->dev_loss = 0; return 0; out: - print_dev_loss(buff, 12, mp->dev_loss); - condlog(3, "%s: dev_loss_tmo = %s %s", mp->alias, buff, origin); + print_dev_loss(buff, 12, pp->dev_loss); + condlog(3, "%s: dev_loss_tmo = %s %s", pp->dev, buff, origin); return 0; } -int select_eh_deadline(struct config *conf, struct multipath *mp) +int select_eh_deadline(struct config *conf, struct path *pp) { const char *origin; char buff[12]; - mp_set_ovr(eh_deadline); - mp_set_hwe(eh_deadline); - mp_set_conf(eh_deadline); - mp->eh_deadline = EH_DEADLINE_UNSET; + pp_set_ovr(eh_deadline); + pp_set_hwe(eh_deadline); + pp_set_conf(eh_deadline); + pp->eh_deadline = EH_DEADLINE_UNSET; /* not changing sysfs in default cause, so don't print anything */ return 0; out: - print_undef_off_zero(buff, 12, mp->eh_deadline); - condlog(3, "%s: eh_deadline = %s %s", mp->alias, buff, origin); + print_undef_off_zero(buff, 12, pp->eh_deadline); + condlog(3, "%s: eh_deadline = %s %s", pp->dev, buff, origin); return 0; } diff --git a/libmultipath/propsel.h b/libmultipath/propsel.h index 72a7e33c..152ca44c 100644 --- a/libmultipath/propsel.h +++ b/libmultipath/propsel.h @@ -16,9 +16,9 @@ int select_minio(struct config *conf, struct multipath *mp); int select_mode(struct config *conf, struct multipath *mp); int select_uid(struct config *conf, struct multipath *mp); int select_gid(struct config *conf, struct multipath *mp); -int select_fast_io_fail(struct config *conf, struct multipath *mp); -int select_dev_loss(struct config *conf, struct multipath *mp); -int select_eh_deadline(struct config *conf, struct multipath *mp); +int select_fast_io_fail(struct config *conf, struct path *pp); +int select_dev_loss(struct config *conf, struct path *pp); +int select_eh_deadline(struct config *conf, struct path *pp); int select_reservation_key(struct config *conf, struct multipath *mp); int select_retain_hwhandler (struct config *conf, struct multipath * mp); int select_detect_prio(struct config *conf, struct path * pp); diff --git a/libmultipath/structs.c b/libmultipath/structs.c index 19099bed..9f86eb69 100644 --- a/libmultipath/structs.c +++ b/libmultipath/structs.c @@ -230,7 +230,6 @@ alloc_multipath (void) mpp->bestpg = 1; mpp->mpcontext = NULL; mpp->no_path_retry = NO_PATH_RETRY_UNDEF; - mpp->fast_io_fail = MP_FAST_IO_FAIL_UNSET; dm_multipath_to_gen(mpp)->ops = &dm_gen_multipath_ops; } return mpp; diff --git a/libmultipath/structs.h b/libmultipath/structs.h index ab99852f..875e726e 100644 --- a/libmultipath/structs.h +++ b/libmultipath/structs.h @@ -344,6 +344,9 @@ struct path { int marginal; int vpd_vendor_id; int recheck_wwid; + int fast_io_fail; + unsigned int dev_loss; + int eh_deadline; /* configlet pointers */ vector hwe; struct gen_path generic_path; @@ -371,7 +374,6 @@ struct multipath { int minio; int flush_on_last_del; int attribute_flags; - int fast_io_fail; int retain_hwhandler; int deferred_remove; bool in_recovery; @@ -389,8 +391,6 @@ struct multipath { int needs_paths_uevent; int ghost_delay; int ghost_delay_tick; - unsigned int dev_loss; - int eh_deadline; uid_t uid; gid_t gid; mode_t mode;