[SCSI] libfc: add some generic NPIV support routines to libfc
Adds a function to create a new VN_Port instances, which share the EM
list with the N_Port, VN_Port lookup by fabric ID when responding to a new
request (otherwise the exchange lookup from the N_Ports EM list is trusted to
return an exchange with a cached lport value for the correct VN_Port),
a pointer to a fc_vport structure for VN_Ports, and flags to indicate if an
N_Port supports NPIV and if the switch/fabric allows it.
Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/libfc/Makefile b/drivers/scsi/libfc/Makefile
index 2be549c..4bb23ac 100644
--- a/drivers/scsi/libfc/Makefile
+++ b/drivers/scsi/libfc/Makefile
@@ -10,4 +10,5 @@
fc_frame.o \
fc_lport.o \
fc_rport.o \
- fc_fcp.o
+ fc_fcp.o \
+ fc_npiv.o
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index ee6031e..751a485 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -1134,6 +1134,15 @@
u32 f_ctl;
enum fc_pf_rjt_reason reject;
+ /* We can have the wrong fc_lport at this point with NPIV, which is a
+ * problem now that we know a new exchange needs to be allocated
+ */
+ lp = fc_vport_id_lookup(lp, ntoh24(fh->fh_d_id));
+ if (!lp) {
+ fc_frame_free(fp);
+ return;
+ }
+
fr_seq(fp) = NULL;
reject = fc_seq_lookup_recip(lp, mp, fp);
if (reject == FC_RJT_NONE) {
@@ -1900,6 +1909,26 @@
}
EXPORT_SYMBOL(fc_exch_mgr_del);
+/**
+ * fc_exch_mgr_list_clone() - share all exchange manager objects
+ * @src: source lport to clone exchange managers from
+ * @dst: new lport that takes references to all the exchange managers
+ */
+int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
+{
+ struct fc_exch_mgr_anchor *ema, *tmp;
+
+ list_for_each_entry(ema, &src->ema_list, ema_list) {
+ if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
+ goto err;
+ }
+ return 0;
+err:
+ list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
+ fc_exch_mgr_del(ema);
+ return -ENOMEM;
+}
+
struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
enum fc_class class,
u16 min_xid, u16 max_xid,
diff --git a/drivers/scsi/libfc/fc_npiv.c b/drivers/scsi/libfc/fc_npiv.c
new file mode 100644
index 0000000..39f02c0
--- /dev/null
+++ b/drivers/scsi/libfc/fc_npiv.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright(c) 2009 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * NPIV VN_Port helper functions for libfc
+ */
+
+#include <scsi/libfc.h>
+
+/**
+ * fc_vport_create() - Create a new NPIV vport instance
+ * @vport: fc_vport structure from scsi_transport_fc
+ * @privsize: driver private data size to allocate along with the Scsi_Host
+ */
+
+struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize)
+{
+ struct Scsi_Host *shost = vport_to_shost(vport);
+ struct fc_lport *n_port = shost_priv(shost);
+ struct fc_lport *vn_port;
+
+ vn_port = libfc_host_alloc(shost->hostt, privsize);
+ if (!vn_port)
+ goto err_out;
+ if (fc_exch_mgr_list_clone(n_port, vn_port))
+ goto err_put;
+
+ vn_port->vport = vport;
+ vport->dd_data = vn_port;
+
+ mutex_lock(&n_port->lp_mutex);
+ list_add_tail(&vn_port->list, &n_port->vports);
+ mutex_unlock(&n_port->lp_mutex);
+
+ return vn_port;
+
+err_put:
+ scsi_host_put(vn_port->host);
+err_out:
+ return NULL;
+}
+EXPORT_SYMBOL(libfc_vport_create);
+
+/**
+ * fc_vport_id_lookup() - find NPIV lport that matches a given fabric ID
+ * @n_port: Top level N_Port which may have multiple NPIV VN_Ports
+ * @port_id: Fabric ID to find a match for
+ *
+ * Returns: matching lport pointer or NULL if there is no match
+ */
+struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id)
+{
+ struct fc_lport *lport = NULL;
+ struct fc_lport *vn_port;
+
+ if (fc_host_port_id(n_port->host) == port_id)
+ return n_port;
+
+ mutex_lock(&n_port->lp_mutex);
+ list_for_each_entry(vn_port, &n_port->vports, list) {
+ if (fc_host_port_id(vn_port->host) == port_id) {
+ lport = vn_port;
+ break;
+ }
+ }
+ mutex_unlock(&n_port->lp_mutex);
+
+ return lport;
+}
+