Commit 174e1ebf authored by Chris Leech's avatar Chris Leech Committed by James Bottomley

[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: default avatarChris Leech <christopher.leech@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 86221969
......@@ -10,4 +10,5 @@ libfc-objs := \
fc_frame.o \
fc_lport.o \
fc_rport.o \
fc_fcp.o
fc_fcp.o \
fc_npiv.o
......@@ -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,
......
/*
* 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;
}
......@@ -640,6 +640,8 @@ struct fc_lport {
/* Associations */
struct Scsi_Host *host;
struct list_head ema_list;
struct list_head vports; /* child vports if N_Port */
struct fc_vport *vport; /* parent vport if VN_Port */
struct fc_rport_priv *dns_rp;
struct fc_rport_priv *ptp_rp;
void *scsi_priv;
......@@ -664,6 +666,8 @@ struct fc_lport {
u32 seq_offload:1; /* seq offload supported */
u32 crc_offload:1; /* crc offload supported */
u32 lro_enabled:1; /* large receive offload */
u32 does_npiv:1; /* supports multiple vports */
u32 npiv_enabled:1; /* switch/fabric allows NPIV */
u32 mfs; /* max FC payload size */
unsigned int service_params;
unsigned int e_d_tov;
......@@ -753,6 +757,7 @@ libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
lport = shost_priv(shost);
lport->host = shost;
INIT_LIST_HEAD(&lport->ema_list);
INIT_LIST_HEAD(&lport->vports);
return lport;
}
......@@ -805,6 +810,15 @@ int fc_lport_reset(struct fc_lport *);
*/
int fc_set_mfs(struct fc_lport *lp, u32 mfs);
/*
* Allocate a new lport struct for an NPIV VN_Port
*/
struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize);
/*
* Find an NPIV VN_Port by port ID
*/
struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id);
/*
* REMOTE PORT LAYER
......@@ -911,6 +925,12 @@ struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
*/
void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
/*
* Clone an exchange manager list, getting reference holds for each EM.
* This is for use with NPIV and sharing the X_ID space between VN_Ports.
*/
int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
/*
* Allocates an Exchange Manager (EM).
*
......
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