[Open-FCoE] [RFC PATCH] [open-fcoe] Add FC pass-through support

Steve Ma steve.ma at intel.com
Mon Apr 20 17:23:24 UTC 2009


This is an implementation of the FC pass-through support in FCoE
via bsg interface according to the RFC published by James Smart
on 11/18/2008 with the title "[RFC] FC pass thru - Rev IV"
---

 drivers/scsi/fcoe/fcoe_sw.c   |    2 
 drivers/scsi/libfc/fc_rport.c |  232 +++++++++++++++++++++++++++++++++++++++++
 include/scsi/libfc.h          |    2 
 3 files changed, 236 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe_sw.c b/drivers/scsi/fcoe/fcoe_sw.c
index 765a388..04f38af 100644
--- a/drivers/scsi/fcoe/fcoe_sw.c
+++ b/drivers/scsi/fcoe/fcoe_sw.c
@@ -83,6 +83,8 @@ struct fc_function_template fcoe_sw_transport_function = {
 	.issue_fc_host_lip = fcoe_reset,
 
 	.terminate_rport_io = fc_rport_terminate_io,
+
+	.bsg_request = fcoe_bsg_request,
 };
 
 static struct scsi_host_template fcoe_sw_shost_template = {
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
index dae6513..41d1519 100644
--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -1314,3 +1314,235 @@ void fc_rport_terminate_io(struct fc_rport *rport)
 	lport->tt.exch_mgr_reset(lport, rport->port_id, 0);
 }
 EXPORT_SYMBOL(fc_rport_terminate_io);
+
+struct fcoe_bsg_info {
+	struct fc_bsg_job *job;
+	struct fc_lport *lport;
+};
+
+static void fc_bsg_els_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rp_arg)
+{
+	struct fcoe_bsg_info *info = (struct fcoe_bsg_info *)rp_arg;
+	struct fc_bsg_job *job = info->job;
+	struct fc_lport *lport = info->lport;
+	unsigned int len;
+	void *pp;
+
+	mutex_lock(&lport->lp_mutex);
+
+	if (IS_ERR(fp))
+		goto err;
+
+	len = fr_len(fp) - sizeof(struct fc_frame_header);
+	pp = fc_frame_payload_get(fp, len);
+
+	sg_copy_from_buffer(job->reply_payload.sg_list,
+			    job->reply_payload.sg_cnt,
+			    pp, len);
+	job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
+
+	if (fc_frame_payload_op(fp) == ELS_LS_ACC)
+		job->reply->reply_data.ctels_reply.status
+			= FC_CTELS_STATUS_OK;
+	else
+		job->reply->reply_data.ctels_reply.status
+			= FC_CTELS_STATUS_REJECT;
+err:
+	fc_frame_free(fp);
+	mutex_unlock(&lport->lp_mutex);
+	kfree(info);
+	job->state_flags = FC_RQST_STATE_DONE;
+	job->job_done(job);
+}
+
+static int fcoe_bsg_els_request(struct fc_bsg_job *job)
+{
+	struct fcoe_bsg_info *info;
+	struct fc_rport *rport = job->rport;
+	struct Scsi_Host *shost;
+	struct fc_lport *lport;
+	struct fc_frame *fp;
+	struct fc_frame_header *fh;
+	char *pp;
+	int len;
+	u32 did;
+
+	shost = rport ? rport_to_shost(rport) : job->shost;
+	lport = shost_priv(shost);
+
+	if (!((lport->state == LPORT_ST_READY) &&
+	    lport->link_up && !lport->qfull))
+		return -EINVAL;
+
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_frame_header) +
+				job->request_payload.payload_len);
+	if (!fp)
+		return -EINVAL;
+
+	len = job->request_payload.payload_len;
+	pp = fc_frame_payload_get(fp, len);
+	memset(pp, 0, len);
+
+	sg_copy_to_buffer(job->request_payload.sg_list,
+			  job->request_payload.sg_cnt,
+			  pp, len);
+
+	switch (pp[0]) {
+	case ELS_RNID:
+	case ELS_RLS:
+	case ELS_RCS:
+		did = job->request->rqst_data.h_els.port_id[0]<<16 |
+		      job->request->rqst_data.h_els.port_id[1]<<8  |
+		      job->request->rqst_data.h_els.port_id[2];
+		break;
+	default:
+		if (!rport) {
+			fc_frame_free(fp);
+			return -EINVAL;
+		}
+		did = rport->port_id;
+		break;
+	}
+
+	fh = fc_frame_header_get(fp);
+	fh->fh_r_ctl = FC_RCTL_ELS_REQ;
+	hton24(fh->fh_d_id, did);
+	hton24(fh->fh_s_id, fc_host_port_id(shost));
+	fh->fh_type = FC_TYPE_ELS;
+	hton24(fh->fh_f_ctl, FC_FC_FIRST_SEQ |
+		FC_FC_END_SEQ | FC_FC_SEQ_INIT);
+	fh->fh_cs_ctl = 0;
+	fh->fh_df_ctl = 0;
+	fh->fh_parm_offset = 0;
+
+	info = kzalloc(sizeof(struct fcoe_bsg_info), GFP_KERNEL);
+	if (!info) {
+		fc_frame_free(fp);
+		return -EINVAL;
+	}
+
+	info->job = job;
+	info->lport = lport;
+
+	lport->tt.exch_seq_send(lport, fp, fc_bsg_els_resp,
+				NULL, (void *)info, lport->e_d_tov);
+	return 0;
+}
+
+static void fc_bsg_ct_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rp_arg)
+{
+	struct fcoe_bsg_info *info = (struct fcoe_bsg_info *)rp_arg;
+	struct fc_bsg_job *job = info->job;
+	struct fc_lport *lport = info->lport;
+	struct fc_ct_hdr *ct;
+	unsigned int len;
+	void *pp;
+
+	mutex_lock(&lport->lp_mutex);
+
+	if (IS_ERR(fp))
+		goto err;
+
+	len = fr_len(fp) - sizeof(struct fc_frame_header);
+	pp = fc_frame_payload_get(fp, len);
+	sg_copy_from_buffer(job->reply_payload.sg_list,
+			    job->reply_payload.sg_cnt,
+			    pp, len);
+	job->reply->reply_payload_rcv_len = job->reply_payload.payload_len;
+
+	ct = (struct fc_ct_hdr *)pp;
+	if (ntohs(ct->ct_cmd) == FC_FS_ACC)
+		job->reply->reply_data.ctels_reply.status
+			= FC_CTELS_STATUS_OK;
+	else
+		job->reply->reply_data.ctels_reply.status
+			= FC_CTELS_STATUS_REJECT;
+err:
+	fc_frame_free(fp);
+	mutex_unlock(&lport->lp_mutex);
+	kfree(info);
+	job->state_flags = FC_RQST_STATE_DONE;
+	job->job_done(job);
+}
+
+static int fcoe_bsg_ct_request(struct fc_bsg_job *job)
+{
+	struct fcoe_bsg_info *info;
+	struct fc_rport *rport = job->rport;
+	struct Scsi_Host *shost;
+	struct fc_lport *lport;
+	struct fc_frame *fp;
+	struct fc_frame_header *fh;
+	struct fc_ct_req *ct;
+	struct fc_ct_hdr *ct_hdr;
+	size_t len;
+	u32 did;
+
+	shost = rport ? rport_to_shost(rport) : job->shost;
+	lport = shost_priv(shost);
+
+	if (!((lport->state == LPORT_ST_READY) &&
+	    lport->link_up && !lport->qfull))
+		return -EINVAL;
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+				job->request_payload.payload_len);
+	if (!fp)
+		return -EINVAL;
+
+	len = job->request_payload.payload_len;
+	ct = fc_frame_payload_get(fp, len);
+	memset(ct, 0, len);
+
+	sg_copy_to_buffer(job->request_payload.sg_list,
+			  job->request_payload.sg_cnt,
+			  ct, len);
+	ct_hdr = &ct->hdr;
+	ct_hdr->ct_cmd = htons((u16)ct_hdr->ct_cmd);
+	ct_hdr->ct_mr_size = htons((u16)ct_hdr->ct_mr_size);
+	did = ct->hdr.ct_in_id[0]<<16 |
+	      ct->hdr.ct_in_id[1]<<8  |
+	      ct->hdr.ct_in_id[2];
+
+	fh = fc_frame_header_get(fp);
+	fh->fh_r_ctl = FC_RCTL_DD_UNSOL_CTL;
+	hton24(fh->fh_d_id, did);
+	hton24(fh->fh_s_id, fc_host_port_id(shost));
+	fh->fh_type = FC_TYPE_CT;
+	hton24(fh->fh_f_ctl, FC_FC_FIRST_SEQ |
+		FC_FC_END_SEQ | FC_FC_SEQ_INIT);
+	fh->fh_cs_ctl = 0;
+	fh->fh_df_ctl = 0;
+	fh->fh_parm_offset = 0;
+
+	info = kzalloc(sizeof(struct fcoe_bsg_info), GFP_KERNEL);
+	if (!info) {
+		fc_frame_free(fp);
+		return -EINVAL;
+	}
+
+	info->job = job;
+	info->lport = lport;
+
+	lport->tt.exch_seq_send(lport, fp, fc_bsg_ct_resp,
+				NULL, (void *)info, lport->e_d_tov);
+	return 0;
+}
+
+int fcoe_bsg_request(struct fc_bsg_job *job)
+{
+	switch (job->request->msgcode) {
+	case FC_BSG_RPT_ELS:
+	case FC_BSG_HST_ELS_NOLOGIN:
+		return fcoe_bsg_els_request(job);
+	case FC_BSG_RPT_CT:
+		return fcoe_bsg_ct_request(job);
+	default:
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL(fcoe_bsg_request);
+
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index a70eafa..221dff0 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -25,6 +25,7 @@
 
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_fc.h>
+#include <scsi/scsi_bsg_fc.h>
 
 #include <scsi/fc/fc_fcp.h>
 #include <scsi/fc/fc_ns.h>
@@ -778,6 +779,7 @@ int fc_set_mfs(struct fc_lport *lp, u32 mfs);
  *****************************/
 int fc_rport_init(struct fc_lport *lp);
 void fc_rport_terminate_io(struct fc_rport *rp);
+int fcoe_bsg_request(struct fc_bsg_job *job);
 
 /*
  * DISCOVERY LAYER




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