diff options
author | Chris Leech <christopher.leech@intel.com> | 2009-11-03 11:46:14 -0800 |
---|---|---|
committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 12:00:56 -0600 |
commit | 174e1ebffd30a7599b889900089f7acef944cc6b (patch) | |
tree | 69b5d4e22f1b997128789eddcd1ec61a33d5903e /drivers/scsi | |
parent | 86221969e20a2f60ce104160dc836a964974673b (diff) | |
download | op-kernel-dev-174e1ebffd30a7599b889900089f7acef944cc6b.zip op-kernel-dev-174e1ebffd30a7599b889900089f7acef944cc6b.tar.gz |
[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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r-- | drivers/scsi/libfc/Makefile | 3 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_exch.c | 29 | ||||
-rw-r--r-- | drivers/scsi/libfc/fc_npiv.c | 86 |
3 files changed, 117 insertions, 1 deletions
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 @@ libfc-objs := \ 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 @@ static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp, 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 @@ void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema) } 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..39f02c09 --- /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; +} + |