File iscsi-initiator-utils-libiscsi-to-support-offload.patch of Package iscsi-initiator-utils

From 1971024a7c6c2c2cf848aba93bd85a707875f216 Mon Sep 17 00:00:00 2001
From: Manish Rangankar <manish.rangankar@qlogic.com>
Date: Wed, 12 Oct 2011 18:57:25 +0530
Subject: [PATCH 2/2] iscsi tools: Modified libisci to support offload.

For an offload solution like qla4xxx requires to do discovery on per port
basis from application. To do that libiscsi need to be modified to take
iSCSI HW address as a input parameter and find out the current active
iface for a given port. Using this iface we can do discovery to a
given port.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
---
 libiscsi/libiscsi.c |  148 +++++++++++++++++++++++++++++++++++++++++++++++++++
 libiscsi/libiscsi.h |   33 +++++++++++
 usr/iface.c         |    2 +-
 3 files changed, 182 insertions(+), 1 deletions(-)

diff --git a/libiscsi/libiscsi.c b/libiscsi/libiscsi.c
index dc63fcd..9b15f01 100644
--- a/libiscsi/libiscsi.c
+++ b/libiscsi/libiscsi.c
@@ -202,6 +202,154 @@ leave:
 	return rc;
 }
 
+static int get_active_ifaces_form_host(struct list_head *ifaces, char *hw_addr,
+				       const char *address, int *nr_iface)
+{
+	int iptype = ISCSI_IFACE_TYPE_IPV4;
+	struct iface_rec *usr_iface, *tmp_iface;
+	struct list_head t_ifaces;
+	int rc = 0;
+
+	INIT_LIST_HEAD(&t_ifaces);
+
+	iface_link_ifaces(&t_ifaces);
+	list_for_each_entry_safe(usr_iface, tmp_iface, &t_ifaces, list) {
+		(*nr_iface)++;
+		if (strcmp(usr_iface->hwaddress, hw_addr)) {
+			(*nr_iface)--;
+			list_del(&usr_iface->list);
+			free(usr_iface);
+		}
+	}
+
+	if (!strstr(address, ".") && strstr(address, ":"))
+		iptype = ISCSI_IFACE_TYPE_IPV6;
+	else if (strstr(address, ".") && !strstr(address, ":"))
+		iptype = ISCSI_IFACE_TYPE_IPV4;
+
+	list_for_each_entry_safe(usr_iface, tmp_iface, &t_ifaces, list) {
+		if (iptype == ISCSI_IFACE_TYPE_IPV4) {
+			if (strstr(usr_iface->name, "ipv4")) {
+				iface_link(ifaces, usr_iface);
+				goto exit_iface;
+			}
+		} else if (iptype == ISCSI_IFACE_TYPE_IPV6) {
+			if (strstr(usr_iface->name, "ipv6")) {
+				iface_link(ifaces, usr_iface);
+				goto exit_iface;
+			}
+		}
+	}
+
+exit_iface:
+	free_iface_list(&t_ifaces);
+	return rc;
+}
+
+int libiscsi_discover_sendtargets_by_hwaddr(struct libiscsi_context *context,
+	const char *address, int port,
+	const struct libiscsi_auth_info *auth_info, char *hw_addr,
+	int *nr_found, struct libiscsi_node **found_nodes)
+{
+	struct discovery_rec drec;
+	LIST_HEAD(bound_rec_list);
+	struct list_head *ifaces, tmp;
+	struct node_rec *rec;
+	int rc = 0, found = 0, nr_iface = 0;
+
+	INIT_LIST_HEAD(&bound_rec_list);
+	INIT_LIST_HEAD(&tmp);
+
+	if (hw_addr == NULL) {
+		strcpy(context->error_str, "Invalid argument");
+		rc = EINVAL;
+		return rc;
+	}
+
+	rc = get_active_ifaces_form_host(&tmp, hw_addr, address,
+					 &nr_iface);
+	if (rc == EINVAL) {
+		strcpy(context->error_str, "Invalid argument");
+		return rc;
+	} else if (nr_iface == 0) {
+		strcpy(context->error_str, "No iface record");
+		return ENODEV;
+	}
+	ifaces = &tmp;
+
+	if (nr_found)
+		*nr_found = 0;
+	if (found_nodes)
+		*found_nodes = NULL;
+
+	CHECK(libiscsi_verify_auth_info(context, auth_info))
+
+	/* Fill the drec struct with all needed info */
+	memset(&drec, 0, sizeof drec);
+	idbm_sendtargets_defaults(&drec.u.sendtargets);
+	drec.type = DISCOVERY_TYPE_SENDTARGETS;
+	strlcpy(drec.address, address, sizeof(drec.address));
+	drec.port = port ? port : ISCSI_LISTEN_PORT;
+	switch (auth_info ? auth_info->method : libiscsi_auth_none) {
+	case libiscsi_auth_chap:
+		drec.u.sendtargets.auth.authmethod = AUTH_METHOD_CHAP;
+		strlcpy(drec.u.sendtargets.auth.username,
+			auth_info->chap.username, AUTH_STR_MAX_LEN);
+		strlcpy((char *)drec.u.sendtargets.auth.password,
+			auth_info->chap.password, AUTH_STR_MAX_LEN);
+		drec.u.sendtargets.auth.password_length =
+			strlen((char *)drec.u.sendtargets.auth.password);
+		strlcpy(drec.u.sendtargets.auth.username_in,
+			auth_info->chap.reverse_username, AUTH_STR_MAX_LEN);
+		strlcpy((char *)drec.u.sendtargets.auth.password_in,
+			auth_info->chap.reverse_password, AUTH_STR_MAX_LEN);
+		drec.u.sendtargets.auth.password_in_length =
+			strlen((char *)drec.u.sendtargets.auth.password_in);
+		break;
+	}
+
+	CHECK(idbm_add_discovery(&drec))
+	CHECK(idbm_bind_ifaces_to_nodes(discovery_sendtargets,
+					&drec, ifaces, &bound_rec_list))
+
+	/* now add/update records */
+	list_for_each_entry(rec, &bound_rec_list, list) {
+		CHECK(idbm_add_node(rec, &drec, 1 /* overwrite */))
+		found++;
+	}
+
+	if (nr_found)
+		*nr_found = found;
+
+	if (found_nodes && found) {
+		*found_nodes = calloc(found, sizeof **found_nodes);
+		if (*found_nodes == NULL) {
+			snprintf(context->error_str,
+				 sizeof(context->error_str), strerror(ENOMEM));
+			rc = ENOMEM;
+			goto leave;
+		}
+		found = 0;
+		list_for_each_entry(rec, &bound_rec_list, list) {
+			strlcpy((*found_nodes)[found].name, rec->name,
+				 LIBISCSI_VALUE_MAXLEN);
+			(*found_nodes)[found].tpgt = rec->tpgt;
+			strlcpy((*found_nodes)[found].address,
+				 rec->conn[0].address, NI_MAXHOST);
+			(*found_nodes)[found].port = rec->conn[0].port;
+			strlcpy((*found_nodes)[found].iface,
+				 rec->iface.name, LIBISCSI_VALUE_MAXLEN);
+			found++;
+		}
+	}
+
+leave:
+	free_iface_list(ifaces);
+	free_rec_list(&bound_rec_list);
+	return rc;
+}
+
+
 int libiscsi_discover_firmware(struct libiscsi_context *context,
 	int *nr_found, struct libiscsi_node **found_nodes)
 {
diff --git a/libiscsi/libiscsi.h b/libiscsi/libiscsi.h
index 61ce0ea..1d8ae7c 100644
--- a/libiscsi/libiscsi.h
+++ b/libiscsi/libiscsi.h
@@ -142,6 +142,39 @@ PUBLIC int libiscsi_discover_sendtargets(struct libiscsi_context *context,
     const char *address, int port, const struct libiscsi_auth_info *auth_info,
     int *nr_found, struct libiscsi_node **found_nodes);
 
+/** \brief Discover iSCSI nodes using sendtargets and add them to the node db.
+ *
+ * This function connects to the given address and port and then tries to
+ * discover iSCSI nodes for a given iSCSI port using the sendtargets protocol.
+ * Any found nodes are added to the local iSCSI node database and are returned
+ * in a dynamically allocated array.
+ *
+ * Note that the (optional) authentication info is for authenticating the
+ * discovery, and is not for the found nodes! If the connection(s) to the
+ * node(s) need authentication too, you can set the username / password for
+ * those (which can be different!) using the libiscsi_node_set_auth() function.
+ *
+ * \param context                libiscsi context to operate on.
+ * \param address                Hostname or IP-address to connect to.
+ * \param port                   Port to connect to, or 0 for the default port.
+ * \param auth_info              Authentication information, or NULL.
+ * \param hw_addr                iSCSI iface mac address.
+ * \param nr_found		 The number of found nodes will be returned
+ *                               through this pointer if not NULL.
+ * \param found_nodes            The address of the dynamically allocated array
+ *                               of found nodes will be returned through this
+ *                               pointer if not NULL. The caller must free this
+ *                               array using free().
+ * \return                       0 on success, otherwise a standard error code
+ *                               (from errno.h).
+ */
+PUBLIC int libiscsi_discover_sendtargets_by_hwaddr(
+				struct libiscsi_context *context,
+				const char *address, int port,
+				const struct libiscsi_auth_info *auth_info,
+				char *hw_addr, int *nr_found,
+				struct libiscsi_node **found_nodes);
+
 /** \brief Read iSCSI node info from firmware and add them to the node db.
  *
  * This function discovers iSCSI nodes using firmware (ppc or ibft). Any found
diff --git a/usr/iface.c b/usr/iface.c
index 9431a97..1531291 100644
--- a/usr/iface.c
+++ b/usr/iface.c
@@ -789,7 +789,7 @@ int iface_for_each_iface(void *data, int skip_def, int *nr_found,
 	return err;
 }
 
-static int iface_link(void *data, struct iface_rec *iface)
+int iface_link(void *data, struct iface_rec *iface)
 {
 	struct list_head *ifaces = data;
 	struct iface_rec *iface_copy;
-- 
1.7.1