diff options
author | Bart Van Assche <bvanassche@acm.org> | 2013-06-28 12:51:26 (GMT) |
---|---|---|
committer | Roland Dreier <roland@purestorage.com> | 2013-07-01 17:40:07 (GMT) |
commit | 96fc248a4c6fe1e5ffac4903b39d2dd5cbe2dc9a (patch) | |
tree | 53f84bcd15b51bfc415f9b74331753eb1850bdeb /drivers/infiniband/ulp | |
parent | 99e1c1398f44a056b16e78122133988c82b66d97 (diff) | |
download | linux-fsl-qoriq-96fc248a4c6fe1e5ffac4903b39d2dd5cbe2dc9a.tar.xz |
IB/srp: Maintain a single connection per I_T nexus
An SRP target is required to maintain a single connection between
initiator and target. This means that if the 'add_target' attribute
is used to create a second connection to a target, the first
connection will be logged out and that the SCSI error handler will
kick in. The SCSI error handler will cause the SRP initiator to
reconnect, which will cause I/O over the second connection to fail.
Avoid such ping-pong behavior by disabling relogins.
If reconnecting manually is necessary, that is possible by deleting
and recreating an rport via sysfs.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Sebastian Riemer <sebastian.riemer@profitbricks.com>
Acked-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/ulp')
-rw-r--r-- | drivers/infiniband/ulp/srp/ib_srp.c | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 1f33101..830ef00 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -542,11 +542,11 @@ static void srp_remove_work(struct work_struct *work) WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED); + srp_remove_target(target); + spin_lock(&target->srp_host->target_lock); list_del(&target->list); spin_unlock(&target->srp_host->target_lock); - - srp_remove_target(target); } static void srp_rport_delete(struct srp_rport *rport) @@ -2009,6 +2009,36 @@ static struct class srp_class = { .dev_release = srp_release_dev }; +/** + * srp_conn_unique() - check whether the connection to a target is unique + */ +static bool srp_conn_unique(struct srp_host *host, + struct srp_target_port *target) +{ + struct srp_target_port *t; + bool ret = false; + + if (target->state == SRP_TARGET_REMOVED) + goto out; + + ret = true; + + spin_lock(&host->target_lock); + list_for_each_entry(t, &host->target_list, list) { + if (t != target && + target->id_ext == t->id_ext && + target->ioc_guid == t->ioc_guid && + target->initiator_ext == t->initiator_ext) { + ret = false; + break; + } + } + spin_unlock(&host->target_lock); + +out: + return ret; +} + /* * Target ports are added by writing * @@ -2265,6 +2295,16 @@ static ssize_t srp_create_target(struct device *dev, if (ret) goto err; + if (!srp_conn_unique(target->srp_host, target)) { + shost_printk(KERN_INFO, target->scsi_host, + PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n", + be64_to_cpu(target->id_ext), + be64_to_cpu(target->ioc_guid), + be64_to_cpu(target->initiator_ext)); + ret = -EEXIST; + goto err; + } + if (!host->srp_dev->fmr_pool && !target->allow_ext_sg && target->cmd_sg_cnt < target->sg_tablesize) { pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n"); |