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iscsi-target: Add iser network portal attribute 

This patch adds a new network portal attribute for iser, that lives
under existing iscsi-target configfs layout at:

   /sys/kernel/config/target/iscsi/$TARGETNAME/$TPGT/np/$PORTAL/iser

When lio_target_np_store_iser() is enabled, iscsit_tpg_add_network_portal()
will attempt to start an rdma_cma network portal for iser-target, only if
the external ib_isert module transport has been loaded.

When disabled, iscsit_tpg_del_network_portal() will cease iser login service
on the network portal, and release any external ib_isert module reference.

v4 changes:

- Add request_module for ib_isert to lio_target_np_store_iser()

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-03-06 22:20:36 -08:00
parent 2ec5a8c118
commit 72438cddd6
1 changed files with 79 additions and 0 deletions
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79
drivers/target/iscsi/iscsi_target_configfs.c
View File

@ -125,8 +125,87 @@ out:
TF_NP_BASE_ATTR(lio_target, sctp, S_IRUGO | S_IWUSR);
static ssize_t lio_target_np_show_iser(
struct se_tpg_np *se_tpg_np,
char *page)
{
struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
struct iscsi_tpg_np, se_tpg_np);
struct iscsi_tpg_np *tpg_np_iser;
ssize_t rb;
tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
if (tpg_np_iser)
rb = sprintf(page, "1\n");
else
rb = sprintf(page, "0\n");
return rb;
}
static ssize_t lio_target_np_store_iser(
struct se_tpg_np *se_tpg_np,
const char *page,
size_t count)
{
struct iscsi_np *np;
struct iscsi_portal_group *tpg;
struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
struct iscsi_tpg_np, se_tpg_np);
struct iscsi_tpg_np *tpg_np_iser = NULL;
char *endptr;
u32 op;
int rc;
op = simple_strtoul(page, &endptr, 0);
if ((op != 1) && (op != 0)) {
pr_err("Illegal value for tpg_enable: %u\n", op);
return -EINVAL;
}
np = tpg_np->tpg_np;
if (!np) {
pr_err("Unable to locate struct iscsi_np from"
" struct iscsi_tpg_np\n");
return -EINVAL;
}
tpg = tpg_np->tpg;
if (iscsit_get_tpg(tpg) < 0)
return -EINVAL;
if (op) {
int rc = request_module("ib_isert");
if (rc != 0)
pr_warn("Unable to request_module for ib_isert\n");
tpg_np_iser = iscsit_tpg_add_network_portal(tpg, &np->np_sockaddr,
np->np_ip, tpg_np, ISCSI_INFINIBAND);
if (!tpg_np_iser || IS_ERR(tpg_np_iser))
goto out;
} else {
tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
if (!tpg_np_iser)
goto out;
rc = iscsit_tpg_del_network_portal(tpg, tpg_np_iser);
if (rc < 0)
goto out;
}
printk("lio_target_np_store_iser() done, op: %d\n", op);
iscsit_put_tpg(tpg);
return count;
out:
iscsit_put_tpg(tpg);
return -EINVAL;
}
TF_NP_BASE_ATTR(lio_target, iser, S_IRUGO | S_IWUSR);
static struct configfs_attribute *lio_target_portal_attrs[] = {
&lio_target_np_sctp.attr,
&lio_target_np_iser.attr,
NULL,
};