linux/drivers/scsi/libfc/fc_libfc.c
Paul Gortmaker acf3368ffb scsi: Fix up files implicitly depending on module.h inclusion
The module.h header was implicitly present everywhere, so files
with no explicit include of the module infrastructure would build
anyway.  We are now removing the implicit include, and so we need
to call out the module.h file that we need explicitly.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:24 -04:00

334 lines
8.8 KiB
C

/*
* 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
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/crc32.h>
#include <linux/module.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>
#include "fc_libfc.h"
MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("libfc");
MODULE_LICENSE("GPL v2");
unsigned int fc_debug_logging;
module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
DEFINE_MUTEX(fc_prov_mutex);
static LIST_HEAD(fc_local_ports);
struct blocking_notifier_head fc_lport_notifier_head =
BLOCKING_NOTIFIER_INIT(fc_lport_notifier_head);
EXPORT_SYMBOL(fc_lport_notifier_head);
/*
* Providers which primarily send requests and PRLIs.
*/
struct fc4_prov *fc_active_prov[FC_FC4_PROV_SIZE] = {
[0] = &fc_rport_t0_prov,
[FC_TYPE_FCP] = &fc_rport_fcp_init,
};
/*
* Providers which receive requests.
*/
struct fc4_prov *fc_passive_prov[FC_FC4_PROV_SIZE] = {
[FC_TYPE_ELS] = &fc_lport_els_prov,
};
/**
* libfc_init() - Initialize libfc.ko
*/
static int __init libfc_init(void)
{
int rc = 0;
rc = fc_setup_fcp();
if (rc)
return rc;
rc = fc_setup_exch_mgr();
if (rc)
goto destroy_pkt_cache;
rc = fc_setup_rport();
if (rc)
goto destroy_em;
return rc;
destroy_em:
fc_destroy_exch_mgr();
destroy_pkt_cache:
fc_destroy_fcp();
return rc;
}
module_init(libfc_init);
/**
* libfc_exit() - Tear down libfc.ko
*/
static void __exit libfc_exit(void)
{
fc_destroy_fcp();
fc_destroy_exch_mgr();
fc_destroy_rport();
}
module_exit(libfc_exit);
/**
* fc_copy_buffer_to_sglist() - This routine copies the data of a buffer
* into a scatter-gather list (SG list).
*
* @buf: pointer to the data buffer.
* @len: the byte-length of the data buffer.
* @sg: pointer to the pointer of the SG list.
* @nents: pointer to the remaining number of entries in the SG list.
* @offset: pointer to the current offset in the SG list.
* @km_type: dedicated page table slot type for kmap_atomic.
* @crc: pointer to the 32-bit crc value.
* If crc is NULL, CRC is not calculated.
*/
u32 fc_copy_buffer_to_sglist(void *buf, size_t len,
struct scatterlist *sg,
u32 *nents, size_t *offset,
enum km_type km_type, u32 *crc)
{
size_t remaining = len;
u32 copy_len = 0;
while (remaining > 0 && sg) {
size_t off, sg_bytes;
void *page_addr;
if (*offset >= sg->length) {
/*
* Check for end and drop resources
* from the last iteration.
*/
if (!(*nents))
break;
--(*nents);
*offset -= sg->length;
sg = sg_next(sg);
continue;
}
sg_bytes = min(remaining, sg->length - *offset);
/*
* The scatterlist item may be bigger than PAGE_SIZE,
* but we are limited to mapping PAGE_SIZE at a time.
*/
off = *offset + sg->offset;
sg_bytes = min(sg_bytes,
(size_t)(PAGE_SIZE - (off & ~PAGE_MASK)));
page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
km_type);
if (crc)
*crc = crc32(*crc, buf, sg_bytes);
memcpy((char *)page_addr + (off & ~PAGE_MASK), buf, sg_bytes);
kunmap_atomic(page_addr, km_type);
buf += sg_bytes;
*offset += sg_bytes;
remaining -= sg_bytes;
copy_len += sg_bytes;
}
return copy_len;
}
/**
* fc_fill_hdr() - fill FC header fields based on request
* @fp: reply frame containing header to be filled in
* @in_fp: request frame containing header to use in filling in reply
* @r_ctl: R_CTL value for header
* @f_ctl: F_CTL value for header, with 0 pad
* @seq_cnt: sequence count for the header, ignored if frame has a sequence
* @parm_offset: parameter / offset value
*/
void fc_fill_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
enum fc_rctl r_ctl, u32 f_ctl, u16 seq_cnt, u32 parm_offset)
{
struct fc_frame_header *fh;
struct fc_frame_header *in_fh;
struct fc_seq *sp;
u32 fill;
fh = __fc_frame_header_get(fp);
in_fh = __fc_frame_header_get(in_fp);
if (f_ctl & FC_FC_END_SEQ) {
fill = -fr_len(fp) & 3;
if (fill) {
/* TODO, this may be a problem with fragmented skb */
memset(skb_put(fp_skb(fp), fill), 0, fill);
f_ctl |= fill;
}
fr_eof(fp) = FC_EOF_T;
} else {
WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
fr_eof(fp) = FC_EOF_N;
}
fh->fh_r_ctl = r_ctl;
memcpy(fh->fh_d_id, in_fh->fh_s_id, sizeof(fh->fh_d_id));
memcpy(fh->fh_s_id, in_fh->fh_d_id, sizeof(fh->fh_s_id));
fh->fh_type = in_fh->fh_type;
hton24(fh->fh_f_ctl, f_ctl);
fh->fh_ox_id = in_fh->fh_ox_id;
fh->fh_rx_id = in_fh->fh_rx_id;
fh->fh_cs_ctl = 0;
fh->fh_df_ctl = 0;
fh->fh_parm_offset = htonl(parm_offset);
sp = fr_seq(in_fp);
if (sp) {
fr_seq(fp) = sp;
fh->fh_seq_id = sp->id;
seq_cnt = sp->cnt;
} else {
fh->fh_seq_id = 0;
}
fh->fh_seq_cnt = ntohs(seq_cnt);
fr_sof(fp) = seq_cnt ? FC_SOF_N3 : FC_SOF_I3;
fr_encaps(fp) = fr_encaps(in_fp);
}
EXPORT_SYMBOL(fc_fill_hdr);
/**
* fc_fill_reply_hdr() - fill FC reply header fields based on request
* @fp: reply frame containing header to be filled in
* @in_fp: request frame containing header to use in filling in reply
* @r_ctl: R_CTL value for reply
* @parm_offset: parameter / offset value
*/
void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
enum fc_rctl r_ctl, u32 parm_offset)
{
struct fc_seq *sp;
sp = fr_seq(in_fp);
if (sp)
fr_seq(fp) = fr_dev(in_fp)->tt.seq_start_next(sp);
fc_fill_hdr(fp, in_fp, r_ctl, FC_FCTL_RESP, 0, parm_offset);
}
EXPORT_SYMBOL(fc_fill_reply_hdr);
/**
* fc_fc4_conf_lport_params() - Modify "service_params" of specified lport
* if there is service provider (target provider) registered with libfc
* for specified "fc_ft_type"
* @lport: Local port which service_params needs to be modified
* @type: FC-4 type, such as FC_TYPE_FCP
*/
void fc_fc4_conf_lport_params(struct fc_lport *lport, enum fc_fh_type type)
{
struct fc4_prov *prov_entry;
BUG_ON(type >= FC_FC4_PROV_SIZE);
BUG_ON(!lport);
prov_entry = fc_passive_prov[type];
if (type == FC_TYPE_FCP) {
if (prov_entry && prov_entry->recv)
lport->service_params |= FCP_SPPF_TARG_FCN;
}
}
void fc_lport_iterate(void (*notify)(struct fc_lport *, void *), void *arg)
{
struct fc_lport *lport;
mutex_lock(&fc_prov_mutex);
list_for_each_entry(lport, &fc_local_ports, lport_list)
notify(lport, arg);
mutex_unlock(&fc_prov_mutex);
}
EXPORT_SYMBOL(fc_lport_iterate);
/**
* fc_fc4_register_provider() - register FC-4 upper-level provider.
* @type: FC-4 type, such as FC_TYPE_FCP
* @prov: structure describing provider including ops vector.
*
* Returns 0 on success, negative error otherwise.
*/
int fc_fc4_register_provider(enum fc_fh_type type, struct fc4_prov *prov)
{
struct fc4_prov **prov_entry;
int ret = 0;
if (type >= FC_FC4_PROV_SIZE)
return -EINVAL;
mutex_lock(&fc_prov_mutex);
prov_entry = (prov->recv ? fc_passive_prov : fc_active_prov) + type;
if (*prov_entry)
ret = -EBUSY;
else
*prov_entry = prov;
mutex_unlock(&fc_prov_mutex);
return ret;
}
EXPORT_SYMBOL(fc_fc4_register_provider);
/**
* fc_fc4_deregister_provider() - deregister FC-4 upper-level provider.
* @type: FC-4 type, such as FC_TYPE_FCP
* @prov: structure describing provider including ops vector.
*/
void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov)
{
BUG_ON(type >= FC_FC4_PROV_SIZE);
mutex_lock(&fc_prov_mutex);
if (prov->recv)
rcu_assign_pointer(fc_passive_prov[type], NULL);
else
rcu_assign_pointer(fc_active_prov[type], NULL);
mutex_unlock(&fc_prov_mutex);
synchronize_rcu();
}
EXPORT_SYMBOL(fc_fc4_deregister_provider);
/**
* fc_fc4_add_lport() - add new local port to list and run notifiers.
* @lport: The new local port.
*/
void fc_fc4_add_lport(struct fc_lport *lport)
{
mutex_lock(&fc_prov_mutex);
list_add_tail(&lport->lport_list, &fc_local_ports);
blocking_notifier_call_chain(&fc_lport_notifier_head,
FC_LPORT_EV_ADD, lport);
mutex_unlock(&fc_prov_mutex);
}
/**
* fc_fc4_del_lport() - remove local port from list and run notifiers.
* @lport: The new local port.
*/
void fc_fc4_del_lport(struct fc_lport *lport)
{
mutex_lock(&fc_prov_mutex);
list_del(&lport->lport_list);
blocking_notifier_call_chain(&fc_lport_notifier_head,
FC_LPORT_EV_DEL, lport);
mutex_unlock(&fc_prov_mutex);
}