nvme: add duplicate_connect option

Add the "duplicate_connect" boolean option (presence means true).
Default is false.

When false, the transport should validate whether a new controller request
is targeted for the same host transport addressing and target transport
addressing as an existing controller. If so, the new controller request
should be rejected.

When true, the callee is explicitly requesting a duplicate controller
connection to be made and the new request should be attempted.

Signed-off-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c
index 8bca36a..4a83137 100644 (file)
--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -548,6 +548,7 @@ static const match_table_t opt_tokens = {
        { NVMF_OPT_HOSTNQN,             "hostnqn=%s"            },
        { NVMF_OPT_HOST_TRADDR,         "host_traddr=%s"        },
        { NVMF_OPT_HOST_ID,             "hostid=%s"             },
+       { NVMF_OPT_DUP_CONNECT,         "duplicate_connect"     },
        { NVMF_OPT_ERR,                 NULL                    }
 };
 
@@ -566,6 +567,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
        opts->nr_io_queues = num_online_cpus();
        opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
        opts->kato = NVME_DEFAULT_KATO;
+       opts->duplicate_connect = false;
 
        options = o = kstrdup(buf, GFP_KERNEL);
        if (!options)
@@ -742,6 +744,9 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
                                goto out;
                        }
                        break;
+               case NVMF_OPT_DUP_CONNECT:
+                       opts->duplicate_connect = true;
+                       break;
                default:
                        pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
                                p);
@@ -823,7 +828,7 @@ EXPORT_SYMBOL_GPL(nvmf_free_options);
 #define NVMF_REQUIRED_OPTS     (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
 #define NVMF_ALLOWED_OPTS      (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
                                 NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
-                                NVMF_OPT_HOST_ID)
+                                NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT)
 
 static struct nvme_ctrl *
 nvmf_create_ctrl(struct device *dev, const char *buf, size_t count)

diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h
index bf33663..a7590cc 100644 (file)
--- a/drivers/nvme/host/fabrics.h
+++ b/drivers/nvme/host/fabrics.h
@@ -57,6 +57,7 @@ enum {
        NVMF_OPT_HOST_TRADDR    = 1 << 10,
        NVMF_OPT_CTRL_LOSS_TMO  = 1 << 11,
        NVMF_OPT_HOST_ID        = 1 << 12,
+       NVMF_OPT_DUP_CONNECT    = 1 << 13,
 };
 
 /**
@@ -96,6 +97,7 @@ struct nvmf_ctrl_options {
        unsigned int            nr_io_queues;
        unsigned int            reconnect_delay;
        bool                    discovery_nqn;
+       bool                    duplicate_connect;
        unsigned int            kato;
        struct nvmf_host        *host;
        int                     max_reconnects;