[PATCH 20/35] libfc: Register Symbolic Port Name (RSPN_ID)

Robert Love
2009-09-11T23:58:51Z

From: Chris Leech <christopher.leech@intel.com>

Register the fc_host symbolic name as the symbolic port name
with the fabric name server.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---

drivers/scsi/libfc/fc_lport.c | 90 +++++++++++++++++++++++++++++++++++++++++
include/scsi/fc/fc_ns.h | 10 +++++
include/scsi/fc_encode.h | 11 +++++
include/scsi/libfc.h | 1
4 files changed, 112 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index ae5e2c3..76197d7 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -110,6 +110,7 @@ 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_rsnn_nn(struct fc_lport *);
+static void fc_lport_enter_rspn_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 *);
@@ -121,6 +122,7 @@ static const char *fc_lport_state_names[] = {
[LPORT_ST_DNS] = "dNS",
[LPORT_ST_RNN_ID] = "RNN_ID",
[LPORT_ST_RSNN_NN] = "RSNN_NN",
+ [LPORT_ST_RSPN_ID] = "RSPN_ID",
[LPORT_ST_RFT_ID] = "RFT_ID",
[LPORT_ST_SCR] = "SCR",
[LPORT_ST_READY] = "Ready",
@@ -969,6 +971,7 @@ static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
case LPORT_ST_RESET:
case LPORT_ST_RNN_ID:
case LPORT_ST_RSNN_NN:
+ case LPORT_ST_RSPN_ID:
case LPORT_ST_RFT_ID:
case LPORT_ST_SCR:
case LPORT_ST_DNS:
@@ -1036,6 +1039,59 @@ err:
}

/**
+ * fc_lport_rspn_id_resp() - Handle response to Register Symbolic Port Name
+ * by ID (RSPN_ID) request
+ * @sp: current sequence in RSPN_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_rspn_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 RSPN_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_RSPN_ID) {
+ FC_LPORT_DBG(lport, "Received a RSPN_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_rspn_id(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+/**
* fc_lport_rsnn_nn_resp() - Handle response to Register Symbolic Node Name
* by Node Name (RSNN_NN) request
* @sp: current sequence in RSNN_NN exchange
@@ -1261,6 +1317,37 @@ static void fc_lport_enter_rft_id(struct fc_lport *lport)
}

/**
+ * fc_rport_enter_rspn_id() - Register symbolic port 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_rspn_id(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ size_t len;
+
+ FC_LPORT_DBG(lport, "Entered RSPN_ID state from %s state\n",
+ fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RSPN_ID);
+
+ len = strnlen(fc_host_symbolic_name(lport->host), 255);
+ fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+ sizeof(struct fc_ns_rspn) + len);
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ if (!lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
+ fc_lport_rspn_id_resp,
+ lport, lport->e_d_tov))
+ fc_lport_error(lport, fp);
+}
+
+/**
* fc_rport_enter_rsnn_nn() - Register symbolic node name with the name server
* @lport: Fibre Channel local port to register
*
@@ -1384,6 +1471,9 @@ static void fc_lport_timeout(struct work_struct *work)
case LPORT_ST_RSNN_NN:
fc_lport_enter_rsnn_nn(lport);
break;
+ case LPORT_ST_RSPN_ID:
+ fc_lport_enter_rspn_id(lport);
+ break;
case LPORT_ST_RFT_ID:
fc_lport_enter_rft_id(lport);
break;
diff --git a/include/scsi/fc/fc_ns.h b/include/scsi/fc/fc_ns.h
index fa82830..3fd59a2 100644
--- a/include/scsi/fc/fc_ns.h
+++ b/include/scsi/fc/fc_ns.h
@@ -47,6 +47,7 @@ enum fc_ns_req {
FC_NS_RFT_ID = 0x0217, /* reg FC4 type for ID */
FC_NS_RPN_ID = 0x0212, /* reg port name for ID */
FC_NS_RNN_ID = 0x0213, /* reg node name for ID */
+ FC_NS_RSPN_ID = 0x0218, /* reg symbolic port name */
FC_NS_RSNN_NN = 0x0239, /* reg symbolic node name */
};

@@ -166,4 +167,13 @@ struct fc_ns_rsnn {
char fr_name[];
} __attribute__((__packed__));

+/*
+ * RSPN_ID request - register symbolic port name
+ */
+struct fc_ns_rspn {
+ struct fc_ns_fid fr_fid; /* port ID object */
+ __u8 fr_name_len;
+ char fr_name[];
+} __attribute__((__packed__));
+
#endif /* _FC_NS_H_ */
diff --git a/include/scsi/fc_encode.h b/include/scsi/fc_encode.h
index 89981af..9afcbb9 100644
--- a/include/scsi/fc_encode.h
+++ b/include/scsi/fc_encode.h
@@ -34,6 +34,7 @@ struct fc_ct_req {
struct fc_ns_rft rft;
struct fc_ns_fid fid;
struct fc_ns_rsnn snn;
+ struct fc_ns_rspn spn;
} payload;
};

@@ -137,6 +138,16 @@ static inline int fc_ct_fill(struct fc_lport *lport,
put_unaligned_be64(lport->wwnn, &ct->payload.rn.fr_wwn);
break;

+ case FC_NS_RSPN_ID:
+ ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rspn));
+ hton24(ct->payload.spn.fr_fid.fp_fid,
+ fc_host_port_id(lport->host));
+ strncpy(ct->payload.spn.fr_name,
+ fc_host_symbolic_name(lport->host), 255);
+ ct->payload.spn.fr_name_len =
+ strnlen(ct->payload.spn.fr_name, 255);
+ break;
+
case FC_NS_RSNN_NN:
ct = fc_ct_hdr_fill(fp, op, sizeof(struct fc_ns_rsnn));
put_unaligned_be64(lport->wwnn, &ct->payload.snn.fr_wwn);
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 40ab252..a5579c3 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -63,6 +63,7 @@ enum fc_lport_state {
LPORT_ST_DNS,
LPORT_ST_RNN_ID,
LPORT_ST_RSNN_NN,
+ LPORT_ST_RSPN_ID,
LPORT_ST_RFT_ID,
LPORT_ST_SCR,
LPORT_ST_READY,