On 02/27/2017 07:26 PM, Benjamin Marzinski wrote:
> This patch adds a detect_checker option that works just like the
> detect_prio option. It currently only detects ALUA devices, and
> if it finds ALUA support, it sets the priortizier to TUR. This is
> useful for devices like the VNX2, where it should be using the
> TUR checker when in ALUA mode (or so I have been told). It is set on by
> default just like detect_prio and retain_attached_hw_handler.
RDAC devices are going also to be affected with this change.
Is it desired?
> Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
> ---
> libmultipath/config.c | 3 +++
> libmultipath/config.h | 2 ++
> libmultipath/defaults.h | 1 +
> libmultipath/dict.c | 10 ++++++++++
> libmultipath/discovery.c | 28 ++++++++++++++++++++++++++--
> libmultipath/hwtable.c | 1 +
> libmultipath/prioritizers/alua_spc3.h | 1 +
> libmultipath/propsel.c | 31 +++++++++++++++++++++----------
> libmultipath/propsel.h | 1 +
> libmultipath/structs.c | 2 ++
> libmultipath/structs.h | 7 +++++++
> multipath/multipath.conf.5 | 18 ++++++++++++++++++
> 12 files changed, 93 insertions(+), 12 deletions(-)
>
> diff --git a/libmultipath/config.c b/libmultipath/config.c
> index 5837dc6..9d3f3e1 100644
> --- a/libmultipath/config.c
> +++ b/libmultipath/config.c
> @@ -343,6 +343,7 @@ merge_hwe (struct hwentry * dst, struct hwentry * src)
> merge_num(user_friendly_names);
> merge_num(retain_hwhandler);
> merge_num(detect_prio);
> + merge_num(detect_checker);
> merge_num(deferred_remove);
> merge_num(delay_watch_checks);
> merge_num(delay_wait_checks);
> @@ -423,6 +424,7 @@ store_hwe (vector hwtable, struct hwentry * dhwe)
> hwe->user_friendly_names = dhwe->user_friendly_names;
> hwe->retain_hwhandler = dhwe->retain_hwhandler;
> hwe->detect_prio = dhwe->detect_prio;
> + hwe->detect_checker = dhwe->detect_checker;
>
> if (dhwe->bl_product && !(hwe->bl_product = set_param_str(dhwe->bl_product)))
> goto out;
> @@ -610,6 +612,7 @@ load_config (char * file)
> conf->fast_io_fail = DEFAULT_FAST_IO_FAIL;
> conf->retain_hwhandler = DEFAULT_RETAIN_HWHANDLER;
> conf->detect_prio = DEFAULT_DETECT_PRIO;
> + conf->detect_checker = DEFAULT_DETECT_CHECKER;
> conf->force_sync = DEFAULT_FORCE_SYNC;
> conf->partition_delim = DEFAULT_PARTITION_DELIM;
> conf->processed_main_config = 0;
> diff --git a/libmultipath/config.h b/libmultipath/config.h
> index 9e47894..9a90745 100644
> --- a/libmultipath/config.h
> +++ b/libmultipath/config.h
> @@ -62,6 +62,7 @@ struct hwentry {
> int user_friendly_names;
> int retain_hwhandler;
> int detect_prio;
> + int detect_checker;
> int deferred_remove;
> int delay_watch_checks;
> int delay_wait_checks;
> @@ -139,6 +140,7 @@ struct config {
> int reassign_maps;
> int retain_hwhandler;
> int detect_prio;
> + int detect_checker;
> int force_sync;
> int deferred_remove;
> int processed_main_config;
> diff --git a/libmultipath/defaults.h b/libmultipath/defaults.h
> index 3ef1579..db2b756 100644
> --- a/libmultipath/defaults.h
> +++ b/libmultipath/defaults.h
> @@ -22,6 +22,7 @@
> #define DEFAULT_DEV_LOSS_TMO 600
> #define DEFAULT_RETAIN_HWHANDLER RETAIN_HWHANDLER_ON
> #define DEFAULT_DETECT_PRIO DETECT_PRIO_ON
> +#define DEFAULT_DETECT_CHECKER DETECT_CHECKER_ON
> #define DEFAULT_DEFERRED_REMOVE DEFERRED_REMOVE_OFF
> #define DEFAULT_DELAY_CHECKS NU_NO
> #define DEFAULT_ERR_CHECKS NU_NO
> diff --git a/libmultipath/dict.c b/libmultipath/dict.c
> index 3521c78..bababdb 100644
> --- a/libmultipath/dict.c
> +++ b/libmultipath/dict.c
> @@ -379,6 +379,13 @@ declare_ovr_snprint(detect_prio, print_yes_no_undef)
> declare_hw_handler(detect_prio, set_yes_no_undef)
> declare_hw_snprint(detect_prio, print_yes_no_undef)
>
> +declare_def_handler(detect_checker, set_yes_no_undef)
> +declare_def_snprint_defint(detect_checker, print_yes_no_undef, YNU_NO)
> +declare_ovr_handler(detect_checker, set_yes_no_undef)
> +declare_ovr_snprint(detect_checker, print_yes_no_undef)
> +declare_hw_handler(detect_checker, set_yes_no_undef)
> +declare_hw_snprint(detect_checker, print_yes_no_undef)
> +
> declare_def_handler(force_sync, set_yes_no)
> declare_def_snprint(force_sync, print_yes_no)
>
> @@ -1419,6 +1426,7 @@ init_keywords(vector keywords)
> install_keyword("reservation_key", &def_reservation_key_handler, &snprint_def_reservation_key);
> install_keyword("retain_attached_hw_handler", &def_retain_hwhandler_handler, &snprint_def_retain_hwhandler);
> install_keyword("detect_prio", &def_detect_prio_handler, &snprint_def_detect_prio);
> + install_keyword("detect_checker", &def_detect_checker_handler, &snprint_def_detect_checker);
> install_keyword("force_sync", &def_force_sync_handler, &snprint_def_force_sync);
> install_keyword("strict_timing", &def_strict_timing_handler, &snprint_def_strict_timing);
> install_keyword("deferred_remove", &def_deferred_remove_handler, &snprint_def_deferred_remove);
> @@ -1509,6 +1517,7 @@ init_keywords(vector keywords)
> install_keyword("user_friendly_names", &hw_user_friendly_names_handler, &snprint_hw_user_friendly_names);
> install_keyword("retain_attached_hw_handler", &hw_retain_hwhandler_handler, &snprint_hw_retain_hwhandler);
> install_keyword("detect_prio", &hw_detect_prio_handler, &snprint_hw_detect_prio);
> + install_keyword("detect_checker", &hw_detect_checker_handler, &snprint_hw_detect_checker);
> install_keyword("deferred_remove", &hw_deferred_remove_handler, &snprint_hw_deferred_remove);
> install_keyword("delay_watch_checks", &hw_delay_watch_checks_handler, &snprint_hw_delay_watch_checks);
> install_keyword("delay_wait_checks", &hw_delay_wait_checks_handler, &snprint_hw_delay_wait_checks);
> @@ -1541,6 +1550,7 @@ init_keywords(vector keywords)
> install_keyword("user_friendly_names", &ovr_user_friendly_names_handler, &snprint_ovr_user_friendly_names);
> install_keyword("retain_attached_hw_handler", &ovr_retain_hwhandler_handler, &snprint_ovr_retain_hwhandler);
> install_keyword("detect_prio", &ovr_detect_prio_handler, &snprint_ovr_detect_prio);
> + install_keyword("detect_checker", &ovr_detect_checker_handler, &snprint_ovr_detect_checker);
> install_keyword("deferred_remove", &ovr_deferred_remove_handler, &snprint_ovr_deferred_remove);
> install_keyword("delay_watch_checks", &ovr_delay_watch_checks_handler, &snprint_ovr_delay_watch_checks);
> install_keyword("delay_wait_checks", &ovr_delay_wait_checks_handler, &snprint_ovr_delay_wait_checks);
> diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
> index 39dd92a..4e99845 100644
> --- a/libmultipath/discovery.c
> +++ b/libmultipath/discovery.c
> @@ -30,6 +30,7 @@
> #include "discovery.h"
> #include "prio.h"
> #include "defaults.h"
> +#include "prioritizers/alua_rtpg.h"
>
> int
> alloc_path_with_pathinfo (struct config *conf, struct udev_device *udevice,
> @@ -829,6 +830,25 @@ get_serial (char * str, int maxlen, int fd)
> return 1;
> }
>
> +static void
> +detect_alua(struct path * pp, struct config *conf)
> +{
> + int ret;
> + int tpgs;
> + unsigned int timeout = conf->checker_timeout;
> +
> + if ((tpgs = get_target_port_group_support(pp->fd, timeout)) <= 0) {
> + pp->tpgs = TPGS_NONE;
> + return;
> + }
> + ret = get_target_port_group(pp, timeout);
> + if (ret < 0 || get_asymmetric_access_state(pp->fd, ret, timeout) < 0) {
> + pp->tpgs = TPGS_NONE;
> + return;
> + }
> + pp->tpgs = tpgs;
> +}
> +
> #define DEFAULT_SGIO_LEN 254
>
> static int
> @@ -1460,11 +1480,14 @@ sysfs_pathinfo(struct path * pp, vector hwtable)
> }
>
> static int
> -scsi_ioctl_pathinfo (struct path * pp, int mask)
> +scsi_ioctl_pathinfo (struct path * pp, struct config *conf, int mask)
> {
> struct udev_device *parent;
> const char *attr_path = NULL;
>
> + if (pp->tpgs == TPGS_UNDEF)
> + detect_alua(pp, conf);
> +
> if (!(mask & DI_SERIAL))
> return 0;
>
> @@ -1524,6 +1547,7 @@ get_state (struct path * pp, struct config *conf, int daemon)
> return PATH_UNCHECKED;
> }
> }
> + select_detect_checker(conf, pp);
> select_checker(conf, pp);
> if (!checker_selected(c)) {
> condlog(3, "%s: No checker selected", pp->dev);
> @@ -1832,7 +1856,7 @@ int pathinfo(struct path *pp, struct config *conf, int mask)
> get_geometry(pp);
>
> if (path_state == PATH_UP && pp->bus == SYSFS_BUS_SCSI &&
> - scsi_ioctl_pathinfo(pp, mask))
> + scsi_ioctl_pathinfo(pp, conf, mask))
> goto blank;
>
> if (pp->bus == SYSFS_BUS_CCISS &&
> diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
> index 8409261..c944015 100644
> --- a/libmultipath/hwtable.c
> +++ b/libmultipath/hwtable.c
> @@ -1122,6 +1122,7 @@ static struct hwentry default_hw[] = {
> .dev_loss = 600,
> .retain_hwhandler = RETAIN_HWHANDLER_ON,
> .detect_prio = DETECT_PRIO_ON,
> + .detect_checker = DETECT_CHECKER_ON,
> .deferred_remove = DEFERRED_REMOVE_OFF,
> .delay_watch_checks = DELAY_CHECKS_OFF,
> .delay_wait_checks = DELAY_CHECKS_OFF,
> diff --git a/libmultipath/prioritizers/alua_spc3.h b/libmultipath/prioritizers/alua_spc3.h
> index 4d4969b..13a0924 100644
> --- a/libmultipath/prioritizers/alua_spc3.h
> +++ b/libmultipath/prioritizers/alua_spc3.h
> @@ -109,6 +109,7 @@ inquiry_command_set_evpd(struct inquiry_command *ic)
> #define VERSION_SPC3 0x05
>
> /* Defined TPGS field values. */
> +#define TPGS_UNDEF -1
> #define TPGS_NONE 0x0
> #define TPGS_IMPLICIT 0x1
> #define TPGS_EXPLICIT 0x2
> diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
> index 1b27476..bba8194 100644
> --- a/libmultipath/propsel.c
> +++ b/libmultipath/propsel.c
> @@ -312,6 +312,11 @@ int select_checker(struct config *conf, struct path *pp)
> char *origin, *checker_name;
> struct checker * c = &pp->checker;
>
> + if (pp->detect_checker == DETECT_CHECKER_ON && pp->tpgs > 0) {
> + checker_name = TUR;
> + origin = "(setting: array autodetected)";
> + goto out;
> + }
> do_set(checker_name, conf->overrides, checker_name, "(setting: multipath.conf overrides section)");
> do_set(checker_name, pp->hwe, checker_name, "(setting: array configuration)");
> do_set(checker_name, conf, checker_name, "(setting: multipath.conf defaults/devices section)");
> @@ -359,20 +364,11 @@ out:
> void
> detect_prio(struct config *conf, struct path * pp)
> {
> - int ret;
> struct prio *p = &pp->prio;
> - int tpgs = 0;
> - unsigned int timeout = conf->checker_timeout;
> char buff[512];
> char *default_prio = PRIO_ALUA;
>
> - if ((tpgs = get_target_port_group_support(pp->fd, timeout)) <= 0)
> - return;
> - pp->tpgs = tpgs;
> - ret = get_target_port_group(pp, timeout);
> - if (ret < 0)
> - return;
> - if (get_asymmetric_access_state(pp->fd, ret, timeout) < 0)
> + if (pp->tpgs <= 0)
> return;
> if (sysfs_get_asymmetric_access_state(pp, buff, 512) >= 0)
> default_prio = PRIO_SYSFS;
> @@ -588,6 +584,21 @@ out:
> return 0;
> }
>
> +int select_detect_checker(struct config *conf, struct path *pp)
> +{
> + char *origin;
> +
> + pp_set_ovr(detect_checker);
> + pp_set_hwe(detect_checker);
> + pp_set_conf(detect_checker);
> + pp_set_default(detect_checker, DEFAULT_DETECT_CHECKER);
> +out:
> + condlog(3, "%s: detect_checker = %s %s", pp->dev,
> + (pp->detect_checker == DETECT_CHECKER_ON)? "yes" : "no",
> + origin);
> + return 0;
> +}
> +
> int select_deferred_remove(struct config *conf, struct multipath *mp)
> {
> char *origin;
> diff --git a/libmultipath/propsel.h b/libmultipath/propsel.h
> index e5b6f93..58a32f3 100644
> --- a/libmultipath/propsel.h
> +++ b/libmultipath/propsel.h
> @@ -19,6 +19,7 @@ int select_dev_loss(struct config *conf, struct multipath *mp);
> 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);
> +int select_detect_checker(struct config *conf, struct path * pp);
> int select_deferred_remove(struct config *conf, struct multipath *mp);
> int select_delay_watch_checks (struct config *conf, struct multipath * mp);
> int select_delay_wait_checks (struct config *conf, struct multipath * mp);
> diff --git a/libmultipath/structs.c b/libmultipath/structs.c
> index ba9edf9..f36a055 100644
> --- a/libmultipath/structs.c
> +++ b/libmultipath/structs.c
> @@ -17,6 +17,7 @@
> #include "structs_vec.h"
> #include "blacklist.h"
> #include "prio.h"
> +#include "prioritizers/alua_spc3.h"
>
> struct adapter_group *
> alloc_adaptergroup(void)
> @@ -96,6 +97,7 @@ alloc_path (void)
> pp->sg_id.lun = -1;
> pp->sg_id.proto_id = SCSI_PROTOCOL_UNSPEC;
> pp->fd = -1;
> + pp->tpgs = TPGS_UNDEF;
> pp->priority = PRIO_UNDEF;
> }
> return pp;
> diff --git a/libmultipath/structs.h b/libmultipath/structs.h
> index dfd65ae..fdcfc85 100644
> --- a/libmultipath/structs.h
> +++ b/libmultipath/structs.h
> @@ -122,6 +122,12 @@ enum detect_prio_states {
> DETECT_PRIO_ON = YNU_YES,
> };
>
> +enum detect_checker_states {
> + DETECT_CHECKER_UNDEF = YNU_UNDEF,
> + DETECT_CHECKER_OFF = YNU_NO,
> + DETECT_CHECKER_ON = YNU_YES,
> +};
> +
> enum deferred_remove_states {
> DEFERRED_REMOVE_UNDEF = YNU_UNDEF,
> DEFERRED_REMOVE_OFF = YNU_NO,
> @@ -211,6 +217,7 @@ struct path {
> int priority;
> int pgindex;
> int detect_prio;
> + int detect_checker;
> int watch_checks;
> int wait_checks;
> int tpgs;
> diff --git a/multipath/multipath.conf.5 b/multipath/multipath.conf.5
> index 179013c..b08bda3 100644
> --- a/multipath/multipath.conf.5
> +++ b/multipath/multipath.conf.5
> @@ -681,6 +681,20 @@ The default is: \fByes\fR
> .
> .
> .TP
> +.B detect_checker
> +if set to
> +.I yes
> +, multipath will try to detect if the device supports SCSI-3 ALUA. If so, the
> +device will automatically use the \fItur\fR checker. If set to
> +.I no
> +, the checker will be selected as usual.
> +.RS
> +.TP
> +The default is: \fByes\fR
> +.RE
> +.
> +.
> +.TP
> .B force_sync
> If set to
> .I yes
> @@ -1169,6 +1183,8 @@ section:
> .TP
> .B detect_prio
> .TP
> +.B detect_checker
> +.TP
> .B deferred_remove
> .TP
> .B san_path_err_threshold
> @@ -1239,6 +1255,8 @@ the values are taken from the \fIdevices\fR or \fIdefaults\fR sections:
> .TP
> .B detect_prio
> .TP
> +.B detect_checker
> +.TP
> .B deferred_remove
> .TP
> .B san_path_err_threshold
>
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