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Commit a11e2545 authored by Vikas Chaudhary's avatar Vikas Chaudhary Committed by James Bottomley
Browse files

[SCSI] scsi_transport_iscsi: added support for host event 



Added support to post kernel host event to application using
netlink interface.

Signed-off-by: default avatarVikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 46801ba6

drivers/scsi/scsi_transport_iscsi.c

+31 −0
Original line number Diff line number Diff line
@@ -1476,6 +1476,37 @@ void iscsi_conn_login_event(struct iscsi_cls_conn *conn, 
}

EXPORT_SYMBOL_GPL(iscsi_conn_login_event);



void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,

			   enum iscsi_host_event_code code, uint32_t data_size,

			   uint8_t *data)

{

	struct nlmsghdr *nlh;

	struct sk_buff *skb;

	struct iscsi_uevent *ev;

	int len = NLMSG_SPACE(sizeof(*ev) + data_size);



	skb = alloc_skb(len, GFP_KERNEL);

	if (!skb) {

		printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",

		       host_no, code);

		return;

	}



	nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);

	ev = NLMSG_DATA(nlh);

	ev->transport_handle = iscsi_handle(transport);

	ev->type = ISCSI_KEVENT_HOST_EVENT;

	ev->r.host_event.host_no = host_no;

	ev->r.host_event.code = code;

	ev->r.host_event.data_size = data_size;



	if (data_size)

		memcpy((char *)ev + sizeof(*ev), data, data_size);



	iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);

}

EXPORT_SYMBOL_GPL(iscsi_post_host_event);



static int

iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,

		    void *payload, int size)

include/scsi/iscsi_if.h

+13 −0
Original line number Diff line number Diff line
@@ -72,6 +72,7 @@ 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,

	ISCSI_KEVENT_HOST_EVENT		= KEVENT_BASE + 10,

};



enum iscsi_tgt_dscvr {
@@ -80,6 +81,13 @@ enum iscsi_tgt_dscvr { 
	ISCSI_TGT_DSCVR_SLP		= 3,

};



enum iscsi_host_event_code {

	ISCSI_EVENT_LINKUP		= 1,

	ISCSI_EVENT_LINKDOWN,

	/* must always be last */

	ISCSI_EVENT_MAX,

};



struct iscsi_uevent {

	uint32_t type; /* k/u events type */

	uint32_t iferror; /* carries interface or resource errors */
@@ -222,6 +230,11 @@ struct iscsi_uevent { 
		struct msg_notify_if_down {

			uint32_t	host_no;

		} notify_if_down;

		struct msg_host_event {

			uint32_t	host_no;

			uint32_t	data_size;

			enum iscsi_host_event_code code;

		} host_event;

	} r;

} __attribute__ ((aligned (sizeof(uint64_t))));

include/scsi/scsi_transport_iscsi.h

+6 −0
Original line number Diff line number Diff line
@@ -166,6 +166,12 @@ extern int iscsi_offload_mesg(struct Scsi_Host *shost, 
			      struct iscsi_transport *transport, uint32_t type,

			      char *data, uint16_t data_size);



extern void iscsi_post_host_event(uint32_t host_no,

				  struct iscsi_transport *transport,

				  enum iscsi_host_event_code code,

				  uint32_t data_size,

				  uint8_t *data);



struct iscsi_cls_conn {

	struct list_head conn_list;	/* item in connlist */

	void *dd_data;			/* LLD private data */