nvmet: use type-name map for address family

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>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 143f3d0..8a5d99e 100644 (file)
--- 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;