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>

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index 97e5b69e066852b1ae1eefd20161fde13c44d352..3565e07ad8a6c47bf4d03ac621d6f74bffd5c5da 100644 (file)
--- 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 01c41f2b66d12ad59a4108cd26164ef7fffd48c1..110c1fde7c683ee9978f626d9b47edda6dabd84c 100644 (file)
--- 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 */