[PATCH V2 0/6] nvmet: configfs code clenaup and fix

[PATCH V2 0/6] nvmet: configfs code clenaup and fix

[Chaitanya Kulkarni]

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Hi,

Over a period of time, configfs added different attributes and groups.
These groups and attributes have common type to name mapping
functionality with code and identical structures (see [1], [2] & [3]).
Where [1] and [2] adds a different structure which can be made generic
and can be resued by [3].

This patch-series adds a new generic structure for type to name mapping
which then used in the [1], [2] and [3] to align the code for 
consistency with removing the code duplication of
struct nvmet_transport name and struct nvmet_ana_state_names.

In short we address following points :-

1. Introducing generic type (identifier) to name (string) structure
   nvmet_type_name_map, by removing the private per attribute
   specific structures (nvmet_transport_name & nvmet_ana_state_names)
   for defining the type to name mapping.
2. Keeping the code consistent with the use of for loop and type-name
   struct array iteration instead of the duplicating strings in if/else
   latter and switch.

Regards,
Chaitanya

[1] struct nvmet_transport_name :- 
commit <a5d18612295a0>("nvmet: refactor configfs transport type handling")
[2] struct nvmet_ana_state_names :- 
commit <62ac0d32f74ea>("nvmet: support configuring ANA groups")
[3] nvmet_addr_adrfam_[store|show] :-
commit <a07b4970f464f>(" nvmet: add a generic NVMe target")

Changes from V1:-
1. Keep goto found pattern.
2. Remove locking for port->enabled in the 5th patch.
3. Update the commit descriptions accoeding to changes.

Chaitanya Kulkarni (6):
  nvmet: add generic type-name mapping
  nvmet: use type-name map for address family
  nvmet: use type-name map for ana states
  nvmet: use type-name map for address treq
  nvmet: centralize port enable access for configfs
  nvmet: align addrfam list to spec

 drivers/nvme/target/configfs.c | 184 ++++++++++++++++-----------------
 include/linux/nvme.h           |   2 +
 2 files changed, 91 insertions(+), 95 deletions(-)

-- 
2.22.1



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[PATCH V2 1/6] nvmet: add generic type-name mapping

[Chaitanya Kulkarni]

This patch adds a new type to name mapping generic structure. It
replaces nvmet_transport_name with new generic mapping structure
nvmet_transport.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 58cabd7b6fc5..143f3d02f334 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -20,10 +20,12 @@ static const struct config_item_type nvmet_subsys_type;
 static LIST_HEAD(nvmet_ports_list);
 struct list_head *nvmet_ports = &nvmet_ports_list;
 
-static const struct nvmet_transport_name {
+struct nvmet_type_name_map {
 	u8		type;
 	const char	*name;
-} nvmet_transport_names[] = {
+};
+
+static struct nvmet_type_name_map nvmet_transport[] = {
 	{ NVMF_TRTYPE_RDMA,	"rdma" },
 	{ NVMF_TRTYPE_FC,	"fc" },
 	{ NVMF_TRTYPE_TCP,	"tcp" },
@@ -254,10 +256,9 @@ static ssize_t nvmet_addr_trtype_show(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(nvmet_transport_names); i++) {
-		if (port->disc_addr.trtype != nvmet_transport_names[i].type)
-			continue;
-		return sprintf(page, "%s\n", nvmet_transport_names[i].name);
+	for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
+		if (port->disc_addr.trtype == nvmet_transport[i].type)
+			return sprintf(page, "%s\n", nvmet_transport[i].name);
 	}
 
 	return sprintf(page, "\n");
@@ -282,8 +283,8 @@ static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 		return -EACCES;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(nvmet_transport_names); i++) {
-		if (sysfs_streq(page, nvmet_transport_names[i].name))
+	for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
+		if (sysfs_streq(page, nvmet_transport[i].name))
 			goto found;
 	}
 
@@ -291,7 +292,7 @@ static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 	return -EINVAL;
 found:
 	memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
-	port->disc_addr.trtype = nvmet_transport_names[i].type;
+	port->disc_addr.trtype = nvmet_transport[i].type;
 	if (port->disc_addr.trtype == NVMF_TRTYPE_RDMA)
 		nvmet_port_init_tsas_rdma(port);
 	return count;
-- 
2.22.1


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[PATCH V2 2/6] nvmet: use type-name map for address family

[Chaitanya Kulkarni]

Right now nvmet_addr_adrfam_[store|show]() uses switch and if else
ladder for address family to string and reverse mapping which also
repeats the strings in show and store function.

With addition of generic nvmet_type_name_map structure we can now get rid
of the switch and if else ladder and string duplication.

Also, we add a newline in before found label in nvmet_addr_trtype_store()
which keeps goto label code consistent with
nvmet_allowed_hosts_drop_link(), nvmet_port_subsys_drop_link() and
nvmet_ana_group_ana_state_store().

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 51 ++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 24 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 143f3d02f334..8a5d99e25192 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -32,31 +32,36 @@ static struct nvmet_type_name_map nvmet_transport[] = {
 	{ NVMF_TRTYPE_LOOP,	"loop" },
 };
 
+static const struct nvmet_type_name_map nvmet_addr_family[] = {
+	{ NVMF_ADDR_FAMILY_PCI,	"pcie" },
+	{ NVMF_ADDR_FAMILY_IP4,	"ipv4" },
+	{ NVMF_ADDR_FAMILY_IP6,	"ipv6" },
+	{ NVMF_ADDR_FAMILY_IB,	"ib" },
+	{ NVMF_ADDR_FAMILY_FC,	"fc" },
+};
+
 /*
  * nvmet_port Generic ConfigFS definitions.
  * Used in any place in the ConfigFS tree that refers to an address.
  */
-static ssize_t nvmet_addr_adrfam_show(struct config_item *item,
-		char *page)
+static ssize_t nvmet_addr_adrfam_show(struct config_item *item, char *page)
 {
-	switch (to_nvmet_port(item)->disc_addr.adrfam) {
-	case NVMF_ADDR_FAMILY_IP4:
-		return sprintf(page, "ipv4\n");
-	case NVMF_ADDR_FAMILY_IP6:
-		return sprintf(page, "ipv6\n");
-	case NVMF_ADDR_FAMILY_IB:
-		return sprintf(page, "ib\n");
-	case NVMF_ADDR_FAMILY_FC:
-		return sprintf(page, "fc\n");
-	default:
-		return sprintf(page, "\n");
+	u8 adrfam = to_nvmet_port(item)->disc_addr.adrfam;
+	int i;
+
+	for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) {
+		if (nvmet_addr_family[i].type == adrfam)
+			return sprintf(page, "%s\n", nvmet_addr_family[i].name);
 	}
+
+	return sprintf(page, "\n");
 }
 
 static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct nvmet_port *port = to_nvmet_port(item);
+	int i;
 
 	if (port->enabled) {
 		pr_err("Cannot modify address while enabled\n");
@@ -64,19 +69,16 @@ static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
 		return -EACCES;
 	}
 
-	if (sysfs_streq(page, "ipv4")) {
-		port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP4;
-	} else if (sysfs_streq(page, "ipv6")) {
-		port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP6;
-	} else if (sysfs_streq(page, "ib")) {
-		port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IB;
-	} else if (sysfs_streq(page, "fc")) {
-		port->disc_addr.adrfam = NVMF_ADDR_FAMILY_FC;
-	} else {
-		pr_err("Invalid value '%s' for adrfam\n", page);
-		return -EINVAL;
+	for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) {
+		if (sysfs_streq(page, nvmet_addr_family[i].name))
+			goto found;
 	}
 
+	pr_err("Invalid value '%s' for adrfam\n", page);
+	return -EINVAL;
+
+found:
+	port->disc_addr.adrfam = i;
 	return count;
 }
 
@@ -290,6 +292,7 @@ static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 
 	pr_err("Invalid value '%s' for trtype\n", page);
 	return -EINVAL;
+
 found:
 	memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
 	port->disc_addr.trtype = nvmet_transport[i].type;
-- 
2.22.1


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[PATCH V2 3/6] nvmet: use type-name map for ana states

[Chaitanya Kulkarni]

Now that we have a generic type to name map for configfs, get rid of
the nvmet_ana_state_names structure and replace it with newly added
nvmet_type_name_map.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 8a5d99e25192..78eb822a20d5 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1153,10 +1153,7 @@ static const struct config_item_type nvmet_referrals_type = {
 	.ct_group_ops	= &nvmet_referral_group_ops,
 };
 
-static struct {
-	enum nvme_ana_state	state;
-	const char		*name;
-} nvmet_ana_state_names[] = {
+struct nvmet_type_name_map nvmet_ana_state[] = {
 	{ NVME_ANA_OPTIMIZED,		"optimized" },
 	{ NVME_ANA_NONOPTIMIZED,	"non-optimized" },
 	{ NVME_ANA_INACCESSIBLE,	"inaccessible" },
@@ -1171,10 +1168,9 @@ static ssize_t nvmet_ana_group_ana_state_show(struct config_item *item,
 	enum nvme_ana_state state = grp->port->ana_state[grp->grpid];
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(nvmet_ana_state_names); i++) {
-		if (state != nvmet_ana_state_names[i].state)
-			continue;
-		return sprintf(page, "%s\n", nvmet_ana_state_names[i].name);
+	for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
+		if (state == nvmet_ana_state[i].type)
+			return sprintf(page, "%s\n", nvmet_ana_state[i].name);
 	}
 
 	return sprintf(page, "\n");
@@ -1184,10 +1180,11 @@ static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item,
 		const char *page, size_t count)
 {
 	struct nvmet_ana_group *grp = to_ana_group(item);
+	enum nvme_ana_state *ana_state = grp->port->ana_state;
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(nvmet_ana_state_names); i++) {
-		if (sysfs_streq(page, nvmet_ana_state_names[i].name))
+	for (i = 0; i < ARRAY_SIZE(nvmet_ana_state); i++) {
+		if (sysfs_streq(page, nvmet_ana_state[i].name))
 			goto found;
 	}
 
@@ -1196,10 +1193,9 @@ static ssize_t nvmet_ana_group_ana_state_store(struct config_item *item,
 
 found:
 	down_write(&nvmet_ana_sem);
-	grp->port->ana_state[grp->grpid] = nvmet_ana_state_names[i].state;
+	ana_state[grp->grpid] = (enum nvme_ana_state) nvmet_ana_state[i].type;
 	nvmet_ana_chgcnt++;
 	up_write(&nvmet_ana_sem);
-
 	nvmet_port_send_ana_event(grp->port);
 	return count;
 }
-- 
2.22.1


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[PATCH V2 4/6] nvmet: use type-name map for address treq

[Chaitanya Kulkarni]

Currently nvmet_addr_treq_[store|show]() uses switch and if else
ladder for address transport requirements to string and reverse
mapping. With addtion of the generic nvmet_type_name_map structure
we can get rid of the switch and if else ladder with string
duplication.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 48 ++++++++++++++++++----------------
 1 file changed, 26 insertions(+), 22 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 78eb822a20d5..9c808f4185a0 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -147,20 +147,24 @@ static ssize_t nvmet_addr_traddr_store(struct config_item *item,
 
 CONFIGFS_ATTR(nvmet_, addr_traddr);
 
-static ssize_t nvmet_addr_treq_show(struct config_item *item,
-		char *page)
+static const struct nvmet_type_name_map nvmet_addr_treq[] = {
+	{ NVMF_TREQ_NOT_SPECIFIED,	"not specified" },
+	{ NVMF_TREQ_REQUIRED,		"required" },
+	{ NVMF_TREQ_NOT_REQUIRED,	"not required" },
+};
+
+static ssize_t nvmet_addr_treq_show(struct config_item *item, char *page)
 {
-	switch (to_nvmet_port(item)->disc_addr.treq &
-		NVME_TREQ_SECURE_CHANNEL_MASK) {
-	case NVMF_TREQ_NOT_SPECIFIED:
-		return sprintf(page, "not specified\n");
-	case NVMF_TREQ_REQUIRED:
-		return sprintf(page, "required\n");
-	case NVMF_TREQ_NOT_REQUIRED:
-		return sprintf(page, "not required\n");
-	default:
-		return sprintf(page, "\n");
+	u8 treq = to_nvmet_port(item)->disc_addr.treq &
+		NVME_TREQ_SECURE_CHANNEL_MASK;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) {
+		if (treq == nvmet_addr_treq[i].type)
+			return sprintf(page, "%s\n", nvmet_addr_treq[i].name);
 	}
+
+	return sprintf(page, "\n");
 }
 
 static ssize_t nvmet_addr_treq_store(struct config_item *item,
@@ -168,6 +172,7 @@ static ssize_t nvmet_addr_treq_store(struct config_item *item,
 {
 	struct nvmet_port *port = to_nvmet_port(item);
 	u8 treq = port->disc_addr.treq & ~NVME_TREQ_SECURE_CHANNEL_MASK;
+	int i;
 
 	if (port->enabled) {
 		pr_err("Cannot modify address while enabled\n");
@@ -175,18 +180,17 @@ static ssize_t nvmet_addr_treq_store(struct config_item *item,
 		return -EACCES;
 	}
 
-	if (sysfs_streq(page, "not specified")) {
-		treq |= NVMF_TREQ_NOT_SPECIFIED;
-	} else if (sysfs_streq(page, "required")) {
-		treq |= NVMF_TREQ_REQUIRED;
-	} else if (sysfs_streq(page, "not required")) {
-		treq |= NVMF_TREQ_NOT_REQUIRED;
-	} else {
-		pr_err("Invalid value '%s' for treq\n", page);
-		return -EINVAL;
+	for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) {
+		if (sysfs_streq(page, nvmet_addr_treq[i].name))
+			goto found;
 	}
-	port->disc_addr.treq = treq;
 
+	pr_err("Invalid value '%s' for treq\n", page);
+	return -EINVAL;
+
+found:
+	treq |= nvmet_addr_treq[i].type;
+	port->disc_addr.treq = treq;
 	return count;
 }
 
-- 
2.22.1


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[PATCH V2 5/6] nvmet: centralize port enable access for configfs

[Chaitanya Kulkarni]

The configfs attributes which are supposed to set when port is disable
such as addr[addrfam|portid|traddr|treq|trsvcid|inline_data_size|trtype]
has repetitive check and generic error message printing.

This patch creates centralize helper to check and print an error
message that also accepts caller as a parameter. This makes error
message easy to parse for the user, removes the duplicate code and
makes it available for futures such scenarios.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 44 +++++++++++++---------------------
 1 file changed, 16 insertions(+), 28 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 9c808f4185a0..20779587eefe 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -40,6 +40,14 @@ static const struct nvmet_type_name_map nvmet_addr_family[] = {
 	{ NVMF_ADDR_FAMILY_FC,	"fc" },
 };
 
+static bool nvmet_is_port_enabled(struct nvmet_port *p, const char *caller)
+{
+	if (p->enabled)
+		pr_err("Disable port '%u' before changing attribute in %s\n",
+				le16_to_cpu(p->disc_addr.portid), caller);
+	return p->enabled;
+}
+
 /*
  * nvmet_port Generic ConfigFS definitions.
  * Used in any place in the ConfigFS tree that refers to an address.
@@ -63,11 +71,8 @@ static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	int i;
 
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 
 	for (i = 1; i < ARRAY_SIZE(nvmet_addr_family); i++) {
 		if (sysfs_streq(page, nvmet_addr_family[i].name))
@@ -104,11 +109,9 @@ static ssize_t nvmet_addr_portid_store(struct config_item *item,
 		return -EINVAL;
 	}
 
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
+
 	port->disc_addr.portid = cpu_to_le16(portid);
 	return count;
 }
@@ -134,11 +137,8 @@ static ssize_t nvmet_addr_traddr_store(struct config_item *item,
 		return -EINVAL;
 	}
 
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 
 	if (sscanf(page, "%s\n", port->disc_addr.traddr) != 1)
 		return -EINVAL;
@@ -174,11 +174,8 @@ static ssize_t nvmet_addr_treq_store(struct config_item *item,
 	u8 treq = port->disc_addr.treq & ~NVME_TREQ_SECURE_CHANNEL_MASK;
 	int i;
 
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 
 	for (i = 0; i < ARRAY_SIZE(nvmet_addr_treq); i++) {
 		if (sysfs_streq(page, nvmet_addr_treq[i].name))
@@ -214,11 +211,8 @@ static ssize_t nvmet_addr_trsvcid_store(struct config_item *item,
 		pr_err("Invalid value '%s' for trsvcid\n", page);
 		return -EINVAL;
 	}
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 
 	if (sscanf(page, "%s\n", port->disc_addr.trsvcid) != 1)
 		return -EINVAL;
@@ -241,11 +235,8 @@ static ssize_t nvmet_param_inline_data_size_store(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	int ret;
 
-	if (port->enabled) {
-		pr_err("Cannot modify inline_data_size while port enabled\n");
-		pr_err("Disable the port before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 	ret = kstrtoint(page, 0, &port->inline_data_size);
 	if (ret) {
 		pr_err("Invalid value '%s' for inline_data_size\n", page);
@@ -283,11 +274,8 @@ static ssize_t nvmet_addr_trtype_store(struct config_item *item,
 	struct nvmet_port *port = to_nvmet_port(item);
 	int i;
 
-	if (port->enabled) {
-		pr_err("Cannot modify address while enabled\n");
-		pr_err("Disable the address before modifying\n");
+	if (nvmet_is_port_enabled(port, __func__))
 		return -EACCES;
-	}
 
 	for (i = 0; i < ARRAY_SIZE(nvmet_transport); i++) {
 		if (sysfs_streq(page, nvmet_transport[i].name))
-- 
2.22.1


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[PATCH V2 6/6] nvmet: align addrfam list to spec

[Chaitanya Kulkarni]

With reference to the NVMeOF Specification (page 44, Figure 38)
discovery log page entry provides address family field. We do set the
transport type field but the adrfam field is not set when using loop
transport and also it doesn't have support in the nvme-cli. So when
reading discovery log page with a loop transport it leads to confusing
output.

As per the spec for adrfam value 254 is reserved for Intra Host
Transport i.e. loopback), we add a required macro in the protocol
header file, set default port disc addr entry's adrfam to
NVMF_ADDR_FAMILY_MAX, and update nvmet_addr_family configfs array for
show/store attribute.

Without this patch, setting adrfam to (ipv4/ipv6/ib/fc/loop/" ") we get
following output for nvme discover command from nvme-cli which is
confusing.
trtype:  loop
adrfam:  ipv4
trtype:  loop
adrfam:  ipv6
trtype:  loop
adrfam:  infiniband
trtype:  loop
adrfam:  fibre-channel
trtype:  loop		# ${CFGFS_HOME}/nvmet/ports/1/addr_adrfam = loop
adrfam:  pci            # <----- pci for loop
trtype:  loop		# ${CFGFS_HOME}/nvmet/ports/1/addr_adrfam = " "
adrfam:  pci            # <----- pci for unrecognized

This patch fixes above output :-
trtype:  loop
adrfam:  ipv4
trtype:  loop
adrfam:  ipv6
trtype:  loop
adrfam:  infiniband
trtype:  loop
adrfam:  fibre-channel
trtype:  loop           # ${CFGFS_HOME}/nvmet/ports/1/addr_adrfam = loop
adrfam:  loop           # <----- loop for loop
trtype:  loop		# ${CFGFS_HOME}/config/nvmet/ports/adrfam = " "
adrfam:  unrecognized   # <----- unrecognized when invalid value

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/target/configfs.c | 14 ++++++++------
 include/linux/nvme.h           |  2 ++
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 20779587eefe..ae8fb4489a10 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -33,11 +33,12 @@ static struct nvmet_type_name_map nvmet_transport[] = {
 };
 
 static const struct nvmet_type_name_map nvmet_addr_family[] = {
-	{ NVMF_ADDR_FAMILY_PCI,	"pcie" },
-	{ NVMF_ADDR_FAMILY_IP4,	"ipv4" },
-	{ NVMF_ADDR_FAMILY_IP6,	"ipv6" },
-	{ NVMF_ADDR_FAMILY_IB,	"ib" },
-	{ NVMF_ADDR_FAMILY_FC,	"fc" },
+	{ NVMF_ADDR_FAMILY_PCI,		"pcie" },
+	{ NVMF_ADDR_FAMILY_IP4,		"ipv4" },
+	{ NVMF_ADDR_FAMILY_IP6,		"ipv6" },
+	{ NVMF_ADDR_FAMILY_IB,		"ib" },
+	{ NVMF_ADDR_FAMILY_FC,		"fc" },
+	{ NVMF_ADDR_FAMILY_LOOP,	"loop" },
 };
 
 static bool nvmet_is_port_enabled(struct nvmet_port *p, const char *caller)
@@ -83,7 +84,7 @@ static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
 	return -EINVAL;
 
 found:
-	port->disc_addr.adrfam = i;
+	port->disc_addr.adrfam = nvmet_addr_family[i].type;
 	return count;
 }
 
@@ -1338,6 +1339,7 @@ static struct config_group *nvmet_ports_make(struct config_group *group,
 	port->inline_data_size = -1;	/* < 0 == let the transport choose */
 
 	port->disc_addr.portid = cpu_to_le16(portid);
+	port->disc_addr.adrfam = NVMF_ADDR_FAMILY_MAX;
 	port->disc_addr.treq = NVMF_TREQ_DISABLE_SQFLOW;
 	config_group_init_type_name(&port->group, name, &nvmet_port_type);
 
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 3d5189f46cb1..2d978d0cbde6 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -38,6 +38,8 @@ enum {
 	NVMF_ADDR_FAMILY_IP6	= 2,	/* IP6 */
 	NVMF_ADDR_FAMILY_IB	= 3,	/* InfiniBand */
 	NVMF_ADDR_FAMILY_FC	= 4,	/* Fibre Channel */
+	NVMF_ADDR_FAMILY_LOOP	= 254,	/* Reserved for host usage */
+	NVMF_ADDR_FAMILY_MAX,
 };
 
 /* Transport Type codes for Discovery Log Page entry TRTYPE field */
-- 
2.22.1


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Re: [PATCH V2 0/6] nvmet: configfs code clenaup and fix

[Christoph Hellwig]

Thanks, applied to nvme-5.8.

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