Commit 01cb225d authored by Mike Christie's avatar Mike Christie Committed by James Bottomley
Browse files

[SCSI] iscsi: add target discvery event to transport class 



Patch from david.somayajulu@qlogic.com:

Add target discovery event. We may have a setup where the iscsi traffic
is on a different netowrk than the other network traffic. In this case
we will want to do discovery though the iscsi card. This patch adds
a event to the transport class that can be used by hw iscsi cards that
support this.

Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 332959cb

drivers/scsi/scsi_transport_iscsi.c

+18 −0
Original line number Diff line number Diff line
@@ -977,6 +977,21 @@ iscsi_if_transport_ep(struct iscsi_transport *transport, 
	return rc;

}



static int

iscsi_tgt_dscvr(struct iscsi_transport *transport,

		struct iscsi_uevent *ev)

{

	struct sockaddr *dst_addr;



	if (!transport->tgt_dscvr)

		return -EINVAL;



	dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));

	return transport->tgt_dscvr(ev->u.tgt_dscvr.type,

				    ev->u.tgt_dscvr.host_no,

				    ev->u.tgt_dscvr.enable, dst_addr);

}



static int

iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)

{
@@ -1065,6 +1080,9 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 
	case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:

		err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);

		break;

	case ISCSI_UEVENT_TGT_DSCVR:

		err = iscsi_tgt_dscvr(transport, ev);

		break;

	default:

		err = -EINVAL;

		break;

include/scsi/iscsi_if.h

+37 −0
Original line number Diff line number Diff line
@@ -47,12 +47,20 @@ enum iscsi_uevent_e { 
	ISCSI_UEVENT_TRANSPORT_EP_POLL		= UEVENT_BASE + 13,

	ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT	= UEVENT_BASE + 14,



	ISCSI_UEVENT_TGT_DSCVR		= UEVENT_BASE + 15,



	/* up events */

	ISCSI_KEVENT_RECV_PDU		= KEVENT_BASE + 1,

	ISCSI_KEVENT_CONN_ERROR		= KEVENT_BASE + 2,

	ISCSI_KEVENT_IF_ERROR		= KEVENT_BASE + 3,

};



enum iscsi_tgt_dscvr {

	ISCSI_TGT_DSCVR_SEND_TARGETS	= 1,

	ISCSI_TGT_DSCVR_ISNS		= 2,

	ISCSI_TGT_DSCVR_SLP		= 3,

};



struct iscsi_uevent {

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

	uint32_t iferror; /* carries interface or resource errors */
@@ -116,6 +124,17 @@ struct iscsi_uevent { 
		struct msg_transport_disconnect {

			uint64_t	ep_handle;

		} ep_disconnect;

		struct msg_tgt_dscvr {

			enum iscsi_tgt_dscvr	type;

			uint32_t	host_no;

			/*

 			 * enable = 1 to establish a new connection

			 * with the server. enable = 0 to disconnect

			 * from the server. Used primarily to switch

			 * from one iSNS server to another.

			 */

			uint32_t	enable;

		} tgt_dscvr;

	} u;

	union {

		/* messages k -> u */
@@ -141,6 +160,24 @@ struct iscsi_uevent { 
		struct msg_transport_connect_ret {

			uint64_t	handle;

		} ep_connect_ret;

		struct msg_tgt_dscvr_ret {

			/*

			 * session/connection pair used to reference

			 * the connection to server

			 */

			uint32_t	sid;

			uint32_t	cid;

			union {

				struct isns {

					/* port # for conn to iSNS server */

					uint16_t isns_port;

					/* listening port to receive SCNs */

					uint16_t scn_port;

					/* listening port to receive ESIs */

					uint16_t esi_port;

				} isns_attrib;

			} u;

		} tgt_dscvr_ret;

	} r;

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

include/scsi/scsi_transport_iscsi.h

+2 −0
Original line number Diff line number Diff line
@@ -127,6 +127,8 @@ struct iscsi_transport { 
			   uint64_t *ep_handle);

	int (*ep_poll) (uint64_t ep_handle, int timeout_ms);

	void (*ep_disconnect) (uint64_t ep_handle);

	int (*tgt_dscvr) (enum iscsi_tgt_dscvr type, uint32_t host_no,

			  uint32_t enable, struct sockaddr *dst_addr);

};



/*

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