[PATCH 26/35] libfc, fcoe: Add FC passthrough support

Robert Love
2009-09-11T23:59:23Z

From: Steve Ma <steve.ma@intel.com>

This is the Open-FCoE implementation of the FC
passthrough support via bsg interface.

Passthrough support is added to both N_Ports and
VN_Ports.

Signed-off-by: Steve Ma <steve.ma@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---

drivers/scsi/fcoe/fcoe.c | 4 +
drivers/scsi/libfc/fc_lport.c | 267 +++++++++++++++++++++++++++++++++++++++++
include/scsi/libfc.h | 7 +
3 files changed, 278 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index ba9de9d..ecd1b9d 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -134,6 +134,8 @@ struct fc_function_template fcoe_transport_function = {
.vport_delete = fcoe_vport_destroy,
.vport_disable = fcoe_vport_disable,
.set_vport_symbolic_name = fcoe_set_vport_symbolic_name,
+
+ .bsg_request = fc_lport_bsg_request,
};

struct fc_function_template fcoe_vport_transport_function = {
@@ -167,6 +169,8 @@ struct fc_function_template fcoe_vport_transport_function = {
.issue_fc_host_lip = fcoe_reset,

.terminate_rport_io = fc_rport_terminate_io,
+
+ .bsg_request = fc_lport_bsg_request,
};

static struct scsi_host_template fcoe_shost_template = {
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index f6fc9f4..33f4c2f 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -94,6 +94,7 @@

#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
+#include <linux/scatterlist.h>

#include "fc_libfc.h"

@@ -127,6 +128,24 @@ static const char *fc_lport_state_names[] = {
[LPORT_ST_RESET] = "reset",
};

+/**
+ * struct fc_bsg_info - FC Passthrough managemet structure
+ * @job: The passthrough job
+ * @lport: The local port to pass through a command
+ * @rsp_code: The expected response code
+ * @sg: job->reply_payload.sg_list
+ * @nents: job->reply_payload.sg_cnt
+ * @offset: The offset into the response data
+ */
+struct fc_bsg_info {
+ struct fc_bsg_job *job;
+ struct fc_lport *lport;
+ u16 rsp_code;
+ struct scatterlist *sg;
+ u32 nents;
+ size_t offset;
+};
+
static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
{
fc_frame_free(fp);
@@ -1509,3 +1528,251 @@ int fc_lport_init(struct fc_lport *lport)
return 0;
}
EXPORT_SYMBOL(fc_lport_init);
+
+/**
+ * fc_lport_bsg_resp() - The common response handler for fc pass-thru requests
+ * @sp: current sequence in the fc pass-thru request exchange
+ * @fp: received response frame
+ * @info_arg: pointer to struct fc_bsg_info
+ */
+static void fc_lport_bsg_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *info_arg)
+{
+ struct fc_bsg_info *info = info_arg;
+ struct fc_bsg_job *job = info->job;
+ struct fc_lport *lport = info->lport;
+ struct fc_frame_header *fh;
+ size_t len;
+ void *buf;
+
+ if (IS_ERR(fp)) {
+ job->reply->result = (PTR_ERR(fp) == -FC_EX_CLOSED) ?
+ -ECONNABORTED : -ETIMEDOUT;
+ job->reply_len = sizeof(uint32_t);
+ job->state_flags |= FC_RQST_STATE_DONE;
+ job->job_done(job);
+ kfree(info);
+ return;
+ }
+
+ mutex_lock(&lport->lp_mutex);
+ fh = fc_frame_header_get(fp);
+ len = fr_len(fp) - sizeof(*fh);
+ buf = fc_frame_payload_get(fp, 0);
+
+ if (fr_sof(fp) == FC_SOF_I3 && !ntohs(fh->fh_seq_cnt)) {
+ /* Get the response code from the first frame payload */
+ unsigned short cmd = (info->rsp_code == FC_FS_ACC) ?
+ ntohs(((struct fc_ct_hdr *)buf)->ct_cmd) :
+ (unsigned short)fc_frame_payload_op(fp);
+
+ /* Save the reply status of the job */
+ job->reply->reply_data.ctels_reply.status =
+ (cmd == info->rsp_code) ?
+ FC_CTELS_STATUS_OK : FC_CTELS_STATUS_REJECT;
+ }
+
+ job->reply->reply_payload_rcv_len +=
+ fc_copy_buffer_to_sglist(buf, len, info->sg, &info->nents,
+ &info->offset, KM_BIO_SRC_IRQ, NULL);
+
+ if (fr_eof(fp) == FC_EOF_T &&
+ (ntoh24(fh->fh_f_ctl) & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
+ (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
+ if (job->reply->reply_payload_rcv_len >
+ job->reply_payload.payload_len)
+ job->reply->reply_payload_rcv_len =
+ job->reply_payload.payload_len;
+ job->reply->result = 0;
+ job->state_flags |= FC_RQST_STATE_DONE;
+ job->job_done(job);
+ kfree(info);
+ }
+ fc_frame_free(fp);
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_els_request() - Send ELS pass-thru request
+ * @job: The bsg fc pass-thru job structure
+ * @lport: The local port sending the request
+ * @did: The destination port id.
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static int fc_lport_els_request(struct fc_bsg_job *job,
+ struct fc_lport *lport,
+ u32 did, u32 tov)
+{
+ struct fc_bsg_info *info;
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ char *pp;
+ int len;
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_frame_header) +
+ job->request_payload.payload_len);
+ if (!fp)
+ return -ENOMEM;
+
+ len = job->request_payload.payload_len;
+ pp = fc_frame_payload_get(fp, len);
+
+ sg_copy_to_buffer(job->request_payload.sg_list,
+ job->request_payload.sg_cnt,
+ pp, len);
+
+ 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(lport->host));
+ 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 fc_bsg_info), GFP_KERNEL);
+ if (!info) {
+ fc_frame_free(fp);
+ return -ENOMEM;
+ }
+
+ info->job = job;
+ info->lport = lport;
+ info->rsp_code = ELS_LS_ACC;
+ info->nents = job->reply_payload.sg_cnt;
+ info->sg = job->reply_payload.sg_list;
+
+ if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
+ NULL, info, tov))
+ return -ECOMM;
+ return 0;
+}
+
+/**
+ * fc_lport_ct_request() - Send CT pass-thru request
+ * @job: The bsg fc pass-thru job structure
+ * @lport: The local port sending the request
+ * @did: The destination FC-ID
+ * @tov: The time to wait for a response
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static int fc_lport_ct_request(struct fc_bsg_job *job,
+ struct fc_lport *lport, u32 did, u32 tov)
+{
+ struct fc_bsg_info *info;
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ struct fc_ct_req *ct;
+ size_t len;
+
+ fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+ job->request_payload.payload_len);
+ if (!fp)
+ return -ENOMEM;
+
+ len = job->request_payload.payload_len;
+ ct = fc_frame_payload_get(fp, len);
+
+ sg_copy_to_buffer(job->request_payload.sg_list,
+ job->request_payload.sg_cnt,
+ ct, len);
+
+ 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(lport->host));
+ 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 fc_bsg_info), GFP_KERNEL);
+ if (!info) {
+ fc_frame_free(fp);
+ return -ENOMEM;
+ }
+
+ info->job = job;
+ info->lport = lport;
+ info->rsp_code = FC_FS_ACC;
+ info->nents = job->reply_payload.sg_cnt;
+ info->sg = job->reply_payload.sg_list;
+
+ if (!lport->tt.exch_seq_send(lport, fp, fc_lport_bsg_resp,
+ NULL, info, tov))
+ return -ECOMM;
+ return 0;
+}
+
+/**
+ * fc_lport_bsg_request() - The common entry point for sending
+ * fc pass-thru requests
+ * @job: The fc pass-thru job structure
+ */
+int fc_lport_bsg_request(struct fc_bsg_job *job)
+{
+ struct request *rsp = job->req->next_rq;
+ struct Scsi_Host *shost = job->shost;
+ struct fc_lport *lport = shost_priv(shost);
+ struct fc_rport *rport;
+ struct fc_rport_priv *rdata;
+ int rc = -EINVAL;
+ u32 did;
+
+ job->reply->reply_payload_rcv_len = 0;
+ rsp->resid_len = job->reply_payload.payload_len;
+
+ mutex_lock(&lport->lp_mutex);
+
+ switch (job->request->msgcode) {
+ case FC_BSG_RPT_ELS:
+ rport = job->rport;
+ if (!rport)
+ break;
+
+ rdata = rport->dd_data;
+ rc = fc_lport_els_request(job, lport, rport->port_id,
+ rdata->e_d_tov);
+ break;
+
+ case FC_BSG_RPT_CT:
+ rport = job->rport;
+ if (!rport)
+ break;
+
+ rdata = rport->dd_data;
+ rc = fc_lport_ct_request(job, lport, rport->port_id,
+ rdata->e_d_tov);
+ break;
+
+ case FC_BSG_HST_CT:
+ did = ntoh24(job->request->rqst_data.h_ct.port_id);
+ if (did == FC_FID_DIR_SERV)
+ rdata = lport->dns_rp;
+ else
+ rdata = lport->tt.rport_lookup(lport, did);
+
+ if (!rdata)
+ break;
+
+ rc = fc_lport_ct_request(job, lport, did, rdata->e_d_tov);
+ break;
+
+ case FC_BSG_HST_ELS_NOLOGIN:
+ did = ntoh24(job->request->rqst_data.h_els.port_id);
+ rc = fc_lport_els_request(job, lport, did, lport->e_d_tov);
+ break;
+ }
+
+ mutex_unlock(&lport->lp_mutex);
+ return rc;
+}
+EXPORT_SYMBOL(fc_lport_bsg_request);
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index a5579c3..3e2df39 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -26,6 +26,7 @@

#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>
@@ -831,6 +832,12 @@ void fc_vport_setlink(struct fc_lport *vn_port);
void fc_vports_linkchange(struct fc_lport *n_port);

/*
+ * Issue fc pass-thru request via bsg interface
+ */
+int fc_lport_bsg_request(struct fc_bsg_job *job);
+
+
+/*
* REMOTE PORT LAYER
*****************************/
int fc_rport_init(struct fc_lport *lp);