[SCSI] scsi_transport_iscsi: Add conn login, kernel to user, event to support offload session login.
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@qlogic.com> Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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17fa575eec
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@ -693,6 +693,19 @@ int iscsi_session_chkready(struct iscsi_cls_session *session)
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}
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EXPORT_SYMBOL_GPL(iscsi_session_chkready);
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int iscsi_is_session_online(struct iscsi_cls_session *session)
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{
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&session->lock, flags);
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if (session->state == ISCSI_SESSION_LOGGED_IN)
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ret = 1;
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spin_unlock_irqrestore(&session->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(iscsi_is_session_online);
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static void iscsi_session_release(struct device *dev)
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{
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struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
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@ -1433,6 +1446,40 @@ void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
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}
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EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
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void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
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enum iscsi_conn_state state)
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{
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struct nlmsghdr *nlh;
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struct sk_buff *skb;
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struct iscsi_uevent *ev;
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struct iscsi_internal *priv;
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int len = NLMSG_SPACE(sizeof(*ev));
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priv = iscsi_if_transport_lookup(conn->transport);
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if (!priv)
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return;
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skb = alloc_skb(len, GFP_ATOMIC);
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if (!skb) {
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iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
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"conn login (%d)\n", state);
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return;
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}
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nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
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ev = NLMSG_DATA(nlh);
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ev->transport_handle = iscsi_handle(conn->transport);
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ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
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ev->r.conn_login.state = state;
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ev->r.conn_login.cid = conn->cid;
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ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
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iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
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iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
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state);
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}
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EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
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static int
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iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
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void *payload, int size)
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@ -71,6 +71,7 @@ enum iscsi_uevent_e {
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ISCSI_KEVENT_PATH_REQ = KEVENT_BASE + 7,
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ISCSI_KEVENT_IF_DOWN = KEVENT_BASE + 8,
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ISCSI_KEVENT_CONN_LOGIN_STATE = KEVENT_BASE + 9,
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};
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enum iscsi_tgt_dscvr {
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@ -198,6 +199,11 @@ struct iscsi_uevent {
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uint32_t cid;
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uint64_t recv_handle;
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} recv_req;
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struct msg_conn_login {
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uint32_t sid;
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uint32_t cid;
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uint32_t state; /* enum iscsi_conn_state */
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} conn_login;
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struct msg_conn_error {
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uint32_t sid;
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uint32_t cid;
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@ -309,6 +315,16 @@ enum iscsi_net_param {
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ISCSI_NET_PARAM_IFACE_NAME = 17,
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};
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enum iscsi_conn_state {
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ISCSI_CONN_STATE_FREE,
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ISCSI_CONN_STATE_XPT_WAIT,
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ISCSI_CONN_STATE_IN_LOGIN,
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ISCSI_CONN_STATE_LOGGED_IN,
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ISCSI_CONN_STATE_IN_LOGOUT,
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ISCSI_CONN_STATE_LOGOUT_REQUESTED,
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ISCSI_CONN_STATE_CLEANUP_WAIT,
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};
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/*
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* Common error codes
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*/
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@ -421,6 +437,7 @@ enum iscsi_host_param {
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#define CAP_DIGEST_OFFLOAD 0x1000 /* offload hdr and data digests */
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#define CAP_PADDING_OFFLOAD 0x2000 /* offload padding insertion, removal,
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and verification */
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#define CAP_LOGIN_OFFLOAD 0x4000 /* offload session login */
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/*
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* These flags describes reason of stop_conn() call
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@ -156,6 +156,8 @@ extern int iscsi_unregister_transport(struct iscsi_transport *tt);
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*/
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extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
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enum iscsi_err error);
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extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
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enum iscsi_conn_state state);
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extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
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char *data, uint32_t data_size);
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@ -268,6 +270,7 @@ struct iscsi_iface {
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dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
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extern int iscsi_session_chkready(struct iscsi_cls_session *session);
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extern int iscsi_is_session_online(struct iscsi_cls_session *session);
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extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
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struct iscsi_transport *transport, int dd_size);
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extern int iscsi_add_session(struct iscsi_cls_session *session,
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