iscsi-target: add new offload transport type

Add new transport type ISCSI_HW_OFFLOAD,
hw offload transport drivers will use
this transport type.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 77 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index 97e5b69e0668..3565e07ad8a6 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -182,12 +182,88 @@ out:
         return rc;
 }
 
+static ssize_t lio_target_np_hw_offload_show(struct config_item *item,
+                                             char *page)
+{
+        struct iscsi_tpg_np *tpg_np = to_iscsi_tpg_np(item);
+        struct iscsi_tpg_np *tpg_np_hw_offload;
+        ssize_t rb;
+
+        tpg_np_hw_offload = iscsit_tpg_locate_child_np(tpg_np,
+                                                       ISCSI_HW_OFFLOAD);
+        if (tpg_np_hw_offload)
+                rb = sprintf(page, "1\n");
+        else
+                rb = sprintf(page, "0\n");
+
+        return rb;
+}
+
+static ssize_t lio_target_np_hw_offload_store(struct config_item *item,
+                                              const char *page, size_t count)
+{
+        struct iscsi_tpg_np *tpg_np = to_iscsi_tpg_np(item);
+        struct iscsi_np *np;
+        struct iscsi_portal_group *tpg;
+        struct iscsi_tpg_np *tpg_np_hw_offload = NULL;
+        u32 op;
+        int rc = 0;
+
+        rc = kstrtou32(page, 0, &op);
+        if (rc)
+                return rc;
+
+        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) {
+                tpg_np_hw_offload = iscsit_tpg_add_network_portal(tpg,
+                                &np->np_sockaddr, tpg_np, ISCSI_HW_OFFLOAD);
+
+                if (IS_ERR(tpg_np_hw_offload)) {
+                        rc = PTR_ERR(tpg_np_hw_offload);
+                        goto out;
+                }
+        } else {
+                tpg_np_hw_offload = iscsit_tpg_locate_child_np(tpg_np,
+                                ISCSI_HW_OFFLOAD);
+
+                if (tpg_np_hw_offload) {
+                        rc = iscsit_tpg_del_network_portal(tpg,
+                                                           tpg_np_hw_offload);
+                        if (rc < 0)
+                                goto out;
+                }
+        }
+
+        iscsit_put_tpg(tpg);
+        return count;
+out:
+        iscsit_put_tpg(tpg);
+        return rc;
+}
+
 CONFIGFS_ATTR(lio_target_np_, sctp);
 CONFIGFS_ATTR(lio_target_np_, iser);
+CONFIGFS_ATTR(lio_target_np_, hw_offload);
 
 static struct configfs_attribute *lio_target_portal_attrs[] = {
         &lio_target_np_attr_sctp,
         &lio_target_np_attr_iser,
+        &lio_target_np_attr_hw_offload,
         NULL,
 };
 
diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h
index 01c41f2b66d1..110c1fde7c68 100644
--- a/include/target/iscsi/iscsi_target_core.h
+++ b/include/target/iscsi/iscsi_target_core.h
@@ -74,6 +74,7 @@ enum iscsit_transport_type {
         ISCSI_IWARP_TCP                         = 3,
         ISCSI_IWARP_SCTP                        = 4,
         ISCSI_INFINIBAND                        = 5,
+        ISCSI_HW_OFFLOAD                        = 6,
 };
 
 /* RFC-3720 7.1.4  Standard Connection State Diagram for a Target */