From: Manish Rangankar <manish.rangankar@xxxxxxxxxx>
Offload drivers like qla4xxx will offload the sending of the login/logout
pdus still, so this patch adds iscsi_conn_login_event which is
used by these types of drivers to notify userspace that the connection
has changed state.
It also adds a iscsi_is_session_online helper so the lld
can query the sessions state field.
Signed-off-by: Manish Rangankar <manish.rangankar@xxxxxxxxxx>
Signed-off-by: Lalit Chandivade <lalit.chandivade@xxxxxxxxxx>
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/scsi_transport_iscsi.c | 47 +++++++++++++++++++++++++++++++++++
include/scsi/iscsi_if.h | 17 ++++++++++++
include/scsi/scsi_transport_iscsi.h | 3 ++
3 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index cde679f..b85f8a4 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -693,6 +693,19 @@ int iscsi_session_chkready(struct iscsi_cls_session *session)
}
EXPORT_SYMBOL_GPL(iscsi_session_chkready);
+int iscsi_is_session_online(struct iscsi_cls_session *session)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&session->lock, flags);
+ if (session->state == ISCSI_SESSION_LOGGED_IN)
+ ret = 1;
+ spin_unlock_irqrestore(&session->lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iscsi_is_session_online);
+
static void iscsi_session_release(struct device *dev)
{
struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
@@ -1433,6 +1446,40 @@ void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
}
EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
+void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
+ enum iscsi_conn_state state)
+{
+ struct nlmsghdr *nlh;
+ struct sk_buff *skb;
+ struct iscsi_uevent *ev;
+ struct iscsi_internal *priv;
+ int len = NLMSG_SPACE(sizeof(*ev));
+
+ priv = iscsi_if_transport_lookup(conn->transport);
+ if (!priv)
+ return;
+
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
+ "conn login (%d)\n", state);
+ return;
+ }
+
+ nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
+ ev = NLMSG_DATA(nlh);
+ ev->transport_handle = iscsi_handle(conn->transport);
+ ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
+ ev->r.conn_login.state = state;
+ ev->r.conn_login.cid = conn->cid;
+ ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
+ iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
+
+ iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
+ state);
+}
+EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
+
static int
iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
void *payload, int size)
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index d3f256a..629ca42 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -71,6 +71,7 @@ enum iscsi_uevent_e {
ISCSI_KEVENT_PATH_REQ = KEVENT_BASE + 7,
ISCSI_KEVENT_IF_DOWN = KEVENT_BASE + 8,
+ ISCSI_KEVENT_CONN_LOGIN_STATE = KEVENT_BASE + 9,
};
enum iscsi_tgt_dscvr {
@@ -198,6 +199,11 @@ struct iscsi_uevent {
uint32_t cid;
uint64_t recv_handle;
} recv_req;
+ struct msg_conn_login {
+ uint32_t sid;
+ uint32_t cid;
+ uint32_t state; /* enum iscsi_conn_state */
+ } conn_login;
struct msg_conn_error {
uint32_t sid;
uint32_t cid;
@@ -309,6 +315,16 @@ enum iscsi_net_param {
ISCSI_NET_PARAM_IFACE_NAME = 17,
};
+enum iscsi_conn_state {
+ ISCSI_CONN_STATE_FREE,
+ ISCSI_CONN_STATE_XPT_WAIT,
+ ISCSI_CONN_STATE_IN_LOGIN,
+ ISCSI_CONN_STATE_LOGGED_IN,
+ ISCSI_CONN_STATE_IN_LOGOUT,
+ ISCSI_CONN_STATE_LOGOUT_REQUESTED,
+ ISCSI_CONN_STATE_CLEANUP_WAIT,
+};
+
/*
* Common error codes
*/
@@ -421,6 +437,7 @@ enum iscsi_host_param {
#define CAP_DIGEST_OFFLOAD 0x1000 /* offload hdr and data digests */
#define CAP_PADDING_OFFLOAD 0x2000 /* offload padding insertion, removal,
and verification */
+#define CAP_LOGIN_OFFLOAD 0x4000 /* offload session login */
/*
* These flags describes reason of stop_conn() call
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 4a3edee..3389cd5 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -156,6 +156,8 @@ extern int iscsi_unregister_transport(struct iscsi_transport *tt);
*/
extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
enum iscsi_err error);
+extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
+ enum iscsi_conn_state state);
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size);
@@ -268,6 +270,7 @@ struct iscsi_iface {
dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
extern int iscsi_session_chkready(struct iscsi_cls_session *session);
+extern int iscsi_is_session_online(struct iscsi_cls_session *session);
extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
struct iscsi_transport *transport, int dd_size);
extern int iscsi_add_session(struct iscsi_cls_session *session,
--
1.7.2.3
--
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