Commit c9c7bd7a authored by Chris Leech's avatar Chris Leech Committed by James Bottomley
Browse files

[SCSI] libfc: RNN_ID may be required before RSNN_NN with some switches 

One could interpret FC-GS-5 to say that an explicit RNN_ID is required
before RSNN_NN is allowed to succeed, which is why RNN_ID was not obsoleted
along with RPN_ID acording to this document:
ftp://ftp.t11.org/t11/member/fc/gs-5/05-546v2.pdf



Signed-off-by: default avatarChris Leech <christopher.leech@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 28cc0e31

drivers/scsi/libfc/fc_lport.c

+90 −1
Original line number Diff line number Diff line
@@ -108,6 +108,7 @@ static void fc_lport_error(struct fc_lport *, struct fc_frame *); 
static void fc_lport_enter_reset(struct fc_lport *);

static void fc_lport_enter_flogi(struct fc_lport *);

static void fc_lport_enter_dns(struct fc_lport *);

static void fc_lport_enter_rnn_id(struct fc_lport *);

static void fc_lport_enter_rft_id(struct fc_lport *);

static void fc_lport_enter_scr(struct fc_lport *);

static void fc_lport_enter_ready(struct fc_lport *);
@@ -117,6 +118,7 @@ static const char *fc_lport_state_names[] = { 
	[LPORT_ST_DISABLED] = "disabled",

	[LPORT_ST_FLOGI] =    "FLOGI",

	[LPORT_ST_DNS] =      "dNS",

	[LPORT_ST_RNN_ID] =   "RNN_ID",

	[LPORT_ST_RFT_ID] =   "RFT_ID",

	[LPORT_ST_SCR] =      "SCR",

	[LPORT_ST_READY] =    "Ready",
@@ -151,7 +153,7 @@ static void fc_lport_rport_callback(struct fc_lport *lport, 
	case RPORT_EV_READY:

		if (lport->state == LPORT_ST_DNS) {

			lport->dns_rp = rdata;

			fc_lport_enter_rft_id(lport);

			fc_lport_enter_rnn_id(lport);

		} else {

			FC_LPORT_DBG(lport, "Received an READY event "

				     "on port (%6x) for the directory "
@@ -963,6 +965,7 @@ static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp) 
			case LPORT_ST_DISABLED:

			case LPORT_ST_READY:

			case LPORT_ST_RESET:

			case LPORT_ST_RNN_ID:

			case LPORT_ST_RFT_ID:

			case LPORT_ST_SCR:

			case LPORT_ST_DNS:
@@ -1029,6 +1032,60 @@ err: 
	mutex_unlock(&lport->lp_mutex);

}



/**

 * fc_lport_rnn_id_resp() - Handle response to Register Node

 *			    Name by ID (RNN_ID) request

 * @sp: current sequence in RNN_ID exchange

 * @fp: response frame

 * @lp_arg: Fibre Channel host port instance

 *

 * Locking Note: This function will be called without the lport lock

 * held, but it will lock, call an _enter_* function or fc_lport_error

 * and then unlock the lport.

 */

static void fc_lport_rnn_id_resp(struct fc_seq *sp, struct fc_frame *fp,

				 void *lp_arg)

{

	struct fc_lport *lport = lp_arg;

	struct fc_frame_header *fh;

	struct fc_ct_hdr *ct;



	FC_LPORT_DBG(lport, "Received a RNN_ID %s\n", fc_els_resp_type(fp));



	if (fp == ERR_PTR(-FC_EX_CLOSED))

		return;



	mutex_lock(&lport->lp_mutex);



	if (lport->state != LPORT_ST_RNN_ID) {

		FC_LPORT_DBG(lport, "Received a RNN_ID response, but in state "

			     "%s\n", fc_lport_state(lport));

		if (IS_ERR(fp))

			goto err;

		goto out;

	}



	if (IS_ERR(fp)) {

		fc_lport_error(lport, fp);

		goto err;

	}



	fh = fc_frame_header_get(fp);

	ct = fc_frame_payload_get(fp, sizeof(*ct));

	if (fh && ct && fh->fh_type == FC_TYPE_CT &&

	    ct->ct_fs_type == FC_FST_DIR &&

	    ct->ct_fs_subtype == FC_NS_SUBTYPE &&

	    ntohs(ct->ct_cmd) == FC_FS_ACC)

		fc_lport_enter_rft_id(lport);

	else

		fc_lport_error(lport, fp);



out:

	fc_frame_free(fp);

err:

	mutex_unlock(&lport->lp_mutex);

}



/**

 * fc_lport_scr_resp() - Handle response to State Change Register (SCR) request

 * @sp: current sequence in SCR exchange
@@ -1146,6 +1203,35 @@ static void fc_lport_enter_rft_id(struct fc_lport *lport) 
		fc_lport_error(lport, fp);

}



/**

 * fc_rport_enter_rnn_id() - Register node name with the name server

 * @lport: Fibre Channel local port to register

 *

 * Locking Note: The lport lock is expected to be held before calling

 * this routine.

 */

static void fc_lport_enter_rnn_id(struct fc_lport *lport)

{

	struct fc_frame *fp;



	FC_LPORT_DBG(lport, "Entered RNN_ID state from %s state\n",

		     fc_lport_state(lport));



	fc_lport_state_enter(lport, LPORT_ST_RNN_ID);



	fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +

			    sizeof(struct fc_ns_rn_id));

	if (!fp) {

		fc_lport_error(lport, fp);

		return;

	}



	if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RNN_ID,

				  fc_lport_rnn_id_resp,

				  lport, lport->e_d_tov))

		fc_lport_error(lport, fp);

}



static struct fc_rport_operations fc_lport_rport_ops = {

	.event_callback = fc_lport_rport_callback,

};
@@ -1207,6 +1293,9 @@ static void fc_lport_timeout(struct work_struct *work) 
	case LPORT_ST_DNS:

		fc_lport_enter_dns(lport);

		break;

	case LPORT_ST_RNN_ID:

		fc_lport_enter_rnn_id(lport);

		break;

	case LPORT_ST_RFT_ID:

		fc_lport_enter_rft_id(lport);

		break;

include/scsi/fc_encode.h

+2 −2
Original line number Diff line number Diff line
@@ -128,12 +128,12 @@ static inline int fc_ct_fill(struct fc_lport *lport, 
		ct->payload.rft.fts = lport->fcts;

		break;



	case FC_NS_RPN_ID:

	case FC_NS_RNN_ID:

		ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rn_id));

		hton24(ct->payload.rn.fr_fid.fp_fid,

		       fc_host_port_id(lport->host));

		ct->payload.rft.fts = lport->fcts;

		put_unaligned_be64(lport->wwpn, &ct->payload.rn.fr_wwn);

		put_unaligned_be64(lport->wwnn, &ct->payload.rn.fr_wwn);

		break;



	default:

include/scsi/libfc.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ enum fc_lport_state { 
	LPORT_ST_DISABLED = 0,

	LPORT_ST_FLOGI,

	LPORT_ST_DNS,

	LPORT_ST_RNN_ID,

	LPORT_ST_RFT_ID,

	LPORT_ST_SCR,

	LPORT_ST_READY,

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