375 lines
9.9 KiB
C
375 lines
9.9 KiB
C
/*
|
|
* Copyright (c) 2010 Cisco Systems, Inc.
|
|
*
|
|
* Portions based on tcm_loop_fabric_scsi.c and libfc/fc_fcp.c
|
|
*
|
|
* Copyright (c) 2007 Intel Corporation. All rights reserved.
|
|
* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
|
|
* Copyright (c) 2008 Mike Christie
|
|
* Copyright (c) 2009 Rising Tide, Inc.
|
|
* Copyright (c) 2009 Linux-iSCSI.org
|
|
* Copyright (c) 2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/* XXX TBD some includes may be extraneous */
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/version.h>
|
|
#include <generated/utsrelease.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/configfs.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/hash.h>
|
|
#include <asm/unaligned.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/libfc.h>
|
|
#include <scsi/fc_encode.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_transport.h>
|
|
#include <target/target_core_fabric_ops.h>
|
|
#include <target/target_core_device.h>
|
|
#include <target/target_core_tpg.h>
|
|
#include <target/target_core_configfs.h>
|
|
#include <target/target_core_base.h>
|
|
#include <target/configfs_macros.h>
|
|
|
|
#include "tcm_fc.h"
|
|
|
|
/*
|
|
* Deliver read data back to initiator.
|
|
* XXX TBD handle resource problems later.
|
|
*/
|
|
int ft_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
|
|
struct se_transport_task *task;
|
|
struct fc_frame *fp = NULL;
|
|
struct fc_exch *ep;
|
|
struct fc_lport *lport;
|
|
struct se_mem *mem;
|
|
size_t remaining;
|
|
u32 f_ctl = FC_FC_EX_CTX | FC_FC_REL_OFF;
|
|
u32 mem_off;
|
|
u32 fh_off = 0;
|
|
u32 frame_off = 0;
|
|
size_t frame_len = 0;
|
|
size_t mem_len;
|
|
size_t tlen;
|
|
size_t off_in_page;
|
|
struct page *page;
|
|
int use_sg;
|
|
int error;
|
|
void *page_addr;
|
|
void *from;
|
|
void *to = NULL;
|
|
|
|
ep = fc_seq_exch(cmd->seq);
|
|
lport = ep->lp;
|
|
cmd->seq = lport->tt.seq_start_next(cmd->seq);
|
|
|
|
task = T_TASK(se_cmd);
|
|
BUG_ON(!task);
|
|
remaining = se_cmd->data_length;
|
|
|
|
/*
|
|
* Setup to use first mem list entry if any.
|
|
*/
|
|
if (task->t_tasks_se_num) {
|
|
mem = list_first_entry(task->t_mem_list,
|
|
struct se_mem, se_list);
|
|
mem_len = mem->se_len;
|
|
mem_off = mem->se_off;
|
|
page = mem->se_page;
|
|
} else {
|
|
mem = NULL;
|
|
mem_len = remaining;
|
|
mem_off = 0;
|
|
page = NULL;
|
|
}
|
|
|
|
/* no scatter/gather in skb for odd word length due to fc_seq_send() */
|
|
use_sg = !(remaining % 4);
|
|
|
|
while (remaining) {
|
|
if (!mem_len) {
|
|
BUG_ON(!mem);
|
|
mem = list_entry(mem->se_list.next,
|
|
struct se_mem, se_list);
|
|
mem_len = min((size_t)mem->se_len, remaining);
|
|
mem_off = mem->se_off;
|
|
page = mem->se_page;
|
|
}
|
|
if (!frame_len) {
|
|
/*
|
|
* If lport's has capability of Large Send Offload LSO)
|
|
* , then allow 'frame_len' to be as big as 'lso_max'
|
|
* if indicated transfer length is >= lport->lso_max
|
|
*/
|
|
frame_len = (lport->seq_offload) ? lport->lso_max :
|
|
cmd->sess->max_frame;
|
|
frame_len = min(frame_len, remaining);
|
|
fp = fc_frame_alloc(lport, use_sg ? 0 : frame_len);
|
|
if (!fp)
|
|
return -ENOMEM;
|
|
to = fc_frame_payload_get(fp, 0);
|
|
fh_off = frame_off;
|
|
frame_off += frame_len;
|
|
/*
|
|
* Setup the frame's max payload which is used by base
|
|
* driver to indicate HW about max frame size, so that
|
|
* HW can do fragmentation appropriately based on
|
|
* "gso_max_size" of underline netdev.
|
|
*/
|
|
fr_max_payload(fp) = cmd->sess->max_frame;
|
|
}
|
|
tlen = min(mem_len, frame_len);
|
|
|
|
if (use_sg) {
|
|
if (!mem) {
|
|
BUG_ON(!task->t_task_buf);
|
|
page_addr = task->t_task_buf + mem_off;
|
|
/*
|
|
* In this case, offset is 'offset_in_page' of
|
|
* (t_task_buf + mem_off) instead of 'mem_off'.
|
|
*/
|
|
off_in_page = offset_in_page(page_addr);
|
|
page = virt_to_page(page_addr);
|
|
tlen = min(tlen, PAGE_SIZE - off_in_page);
|
|
} else
|
|
off_in_page = mem_off;
|
|
BUG_ON(!page);
|
|
get_page(page);
|
|
skb_fill_page_desc(fp_skb(fp),
|
|
skb_shinfo(fp_skb(fp))->nr_frags,
|
|
page, off_in_page, tlen);
|
|
fr_len(fp) += tlen;
|
|
fp_skb(fp)->data_len += tlen;
|
|
fp_skb(fp)->truesize +=
|
|
PAGE_SIZE << compound_order(page);
|
|
} else if (mem) {
|
|
BUG_ON(!page);
|
|
from = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
|
|
KM_SOFTIRQ0);
|
|
page_addr = from;
|
|
from += mem_off & ~PAGE_MASK;
|
|
tlen = min(tlen, (size_t)(PAGE_SIZE -
|
|
(mem_off & ~PAGE_MASK)));
|
|
memcpy(to, from, tlen);
|
|
kunmap_atomic(page_addr, KM_SOFTIRQ0);
|
|
to += tlen;
|
|
} else {
|
|
from = task->t_task_buf + mem_off;
|
|
memcpy(to, from, tlen);
|
|
to += tlen;
|
|
}
|
|
|
|
mem_off += tlen;
|
|
mem_len -= tlen;
|
|
frame_len -= tlen;
|
|
remaining -= tlen;
|
|
|
|
if (frame_len &&
|
|
(skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN))
|
|
continue;
|
|
if (!remaining)
|
|
f_ctl |= FC_FC_END_SEQ;
|
|
fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
|
|
FC_TYPE_FCP, f_ctl, fh_off);
|
|
error = lport->tt.seq_send(lport, cmd->seq, fp);
|
|
if (error) {
|
|
/* XXX For now, initiator will retry */
|
|
if (printk_ratelimit())
|
|
printk(KERN_ERR "%s: Failed to send frame %p, "
|
|
"xid <0x%x>, remaining %zu, "
|
|
"lso_max <0x%x>\n",
|
|
__func__, fp, ep->xid,
|
|
remaining, lport->lso_max);
|
|
}
|
|
}
|
|
return ft_queue_status(se_cmd);
|
|
}
|
|
|
|
/*
|
|
* Receive write data frame.
|
|
*/
|
|
void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
struct fc_seq *seq = cmd->seq;
|
|
struct fc_exch *ep;
|
|
struct fc_lport *lport;
|
|
struct se_transport_task *task;
|
|
struct fc_frame_header *fh;
|
|
struct se_mem *mem;
|
|
u32 mem_off;
|
|
u32 rel_off;
|
|
size_t frame_len;
|
|
size_t mem_len;
|
|
size_t tlen;
|
|
struct page *page;
|
|
void *page_addr;
|
|
void *from;
|
|
void *to;
|
|
u32 f_ctl;
|
|
void *buf;
|
|
|
|
task = T_TASK(se_cmd);
|
|
BUG_ON(!task);
|
|
|
|
fh = fc_frame_header_get(fp);
|
|
if (!(ntoh24(fh->fh_f_ctl) & FC_FC_REL_OFF))
|
|
goto drop;
|
|
|
|
/*
|
|
* Doesn't expect even single byte of payload. Payload
|
|
* is expected to be copied directly to user buffers
|
|
* due to DDP (Large Rx offload) feature, hence
|
|
* BUG_ON if BUF is non-NULL
|
|
*/
|
|
buf = fc_frame_payload_get(fp, 1);
|
|
if (cmd->was_ddp_setup && buf) {
|
|
printk(KERN_INFO "%s: When DDP was setup, not expected to"
|
|
"receive frame with payload, Payload shall be"
|
|
"copied directly to buffer instead of coming "
|
|
"via. legacy receive queues\n", __func__);
|
|
BUG_ON(buf);
|
|
}
|
|
|
|
/*
|
|
* If ft_cmd indicated 'ddp_setup', in that case only the last frame
|
|
* should come with 'TSI bit being set'. If 'TSI bit is not set and if
|
|
* data frame appears here, means error condition. In both the cases
|
|
* release the DDP context (ddp_put) and in error case, as well
|
|
* initiate error recovery mechanism.
|
|
*/
|
|
ep = fc_seq_exch(seq);
|
|
if (cmd->was_ddp_setup) {
|
|
BUG_ON(!ep);
|
|
lport = ep->lp;
|
|
BUG_ON(!lport);
|
|
}
|
|
if (cmd->was_ddp_setup && ep->xid != FC_XID_UNKNOWN) {
|
|
f_ctl = ntoh24(fh->fh_f_ctl);
|
|
/*
|
|
* If TSI bit set in f_ctl, means last write data frame is
|
|
* received successfully where payload is posted directly
|
|
* to user buffer and only the last frame's header is posted
|
|
* in legacy receive queue
|
|
*/
|
|
if (f_ctl & FC_FC_SEQ_INIT) { /* TSI bit set in FC frame */
|
|
cmd->write_data_len = lport->tt.ddp_done(lport,
|
|
ep->xid);
|
|
goto last_frame;
|
|
} else {
|
|
/*
|
|
* Updating the write_data_len may be meaningless at
|
|
* this point, but just in case if required in future
|
|
* for debugging or any other purpose
|
|
*/
|
|
printk(KERN_ERR "%s: Received frame with TSI bit not"
|
|
" being SET, dropping the frame, "
|
|
"cmd->sg <%p>, cmd->sg_cnt <0x%x>\n",
|
|
__func__, cmd->sg, cmd->sg_cnt);
|
|
cmd->write_data_len = lport->tt.ddp_done(lport,
|
|
ep->xid);
|
|
lport->tt.seq_exch_abort(cmd->seq, 0);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
rel_off = ntohl(fh->fh_parm_offset);
|
|
frame_len = fr_len(fp);
|
|
if (frame_len <= sizeof(*fh))
|
|
goto drop;
|
|
frame_len -= sizeof(*fh);
|
|
from = fc_frame_payload_get(fp, 0);
|
|
if (rel_off >= se_cmd->data_length)
|
|
goto drop;
|
|
if (frame_len + rel_off > se_cmd->data_length)
|
|
frame_len = se_cmd->data_length - rel_off;
|
|
|
|
/*
|
|
* Setup to use first mem list entry if any.
|
|
*/
|
|
if (task->t_tasks_se_num) {
|
|
mem = list_first_entry(task->t_mem_list,
|
|
struct se_mem, se_list);
|
|
mem_len = mem->se_len;
|
|
mem_off = mem->se_off;
|
|
page = mem->se_page;
|
|
} else {
|
|
mem = NULL;
|
|
page = NULL;
|
|
mem_off = 0;
|
|
mem_len = frame_len;
|
|
}
|
|
|
|
while (frame_len) {
|
|
if (!mem_len) {
|
|
BUG_ON(!mem);
|
|
mem = list_entry(mem->se_list.next,
|
|
struct se_mem, se_list);
|
|
mem_len = mem->se_len;
|
|
mem_off = mem->se_off;
|
|
page = mem->se_page;
|
|
}
|
|
if (rel_off >= mem_len) {
|
|
rel_off -= mem_len;
|
|
mem_len = 0;
|
|
continue;
|
|
}
|
|
mem_off += rel_off;
|
|
mem_len -= rel_off;
|
|
rel_off = 0;
|
|
|
|
tlen = min(mem_len, frame_len);
|
|
|
|
if (mem) {
|
|
to = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
|
|
KM_SOFTIRQ0);
|
|
page_addr = to;
|
|
to += mem_off & ~PAGE_MASK;
|
|
tlen = min(tlen, (size_t)(PAGE_SIZE -
|
|
(mem_off & ~PAGE_MASK)));
|
|
memcpy(to, from, tlen);
|
|
kunmap_atomic(page_addr, KM_SOFTIRQ0);
|
|
} else {
|
|
to = task->t_task_buf + mem_off;
|
|
memcpy(to, from, tlen);
|
|
}
|
|
from += tlen;
|
|
frame_len -= tlen;
|
|
mem_off += tlen;
|
|
mem_len -= tlen;
|
|
cmd->write_data_len += tlen;
|
|
}
|
|
last_frame:
|
|
if (cmd->write_data_len == se_cmd->data_length)
|
|
transport_generic_handle_data(se_cmd);
|
|
drop:
|
|
fc_frame_free(fp);
|
|
}
|