[SCSI] libfc: Honor LS_ACC response codes for PRLI

As per FC-LS Rev 1.62 table 46, response codes are handled as follows:

1. If the Req executed is true, PRLI is accepted.
2. If Req executed is not set, if resp code is 5,
PRLI is not retried and port is logged out.
3. If resp code is anything apart from 1 or 5, PRLI is retired
upto max retry count.

Signed-off-by: Bhanu Prakash Gollapudi <[e-mail]>
Signed-off-by: Robert Love <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/libfc/fc_rport.c

···
 	u32 roles = FC_RPORT_ROLE_UNKNOWN;
 	u32 fcp_parm = 0;
 	u8 op;
+	u8 resp_code = 0;
 
 	mutex_lock(&rdata->rp_mutex);
 
···
 	op = fc_frame_payload_op(fp);
 	if (op == ELS_LS_ACC) {
 		pp = fc_frame_payload_get(fp, sizeof(*pp));
-		if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
-			fcp_parm = ntohl(pp->spp.spp_params);
-			if (fcp_parm & FCP_SPPF_RETRY)
-				rdata->flags |= FC_RP_FLAGS_RETRY;
+		if (!pp)
+			goto out;
+
+		resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
+		FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x\n",
+			     pp->spp.spp_flags);
+		if (resp_code != FC_SPP_RESP_ACK) {
+			if (resp_code == FC_SPP_RESP_CONF)
+				fc_rport_error(rdata, fp);
+			else
+				fc_rport_error_retry(rdata, fp);
+			goto out;
 		}
+		if (pp->prli.prli_spp_len < sizeof(pp->spp))
+			goto out;
+
+		fcp_parm = ntohl(pp->spp.spp_params);
+		if (fcp_parm & FCP_SPPF_RETRY)
+			rdata->flags |= FC_RP_FLAGS_RETRY;
 
 		rdata->supported_classes = FC_COS_CLASS3;
 		if (fcp_parm & FCP_SPPF_INIT_FCN)