mirror of https://gitee.com/openkylin/linux.git
334 lines
8.9 KiB
C
334 lines
8.9 KiB
C
/*
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* Copyright (c) 2010 Cisco Systems, Inc.
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*
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* Portions based on tcm_loop_fabric_scsi.c and libfc/fc_fcp.c
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*
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* Copyright (c) 2007 Intel Corporation. All rights reserved.
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* Copyright (c) 2008 Red Hat, Inc. All rights reserved.
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* Copyright (c) 2008 Mike Christie
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* Copyright (c) 2009 Rising Tide, Inc.
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* Copyright (c) 2009 Linux-iSCSI.org
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* Copyright (c) 2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* XXX TBD some includes may be extraneous */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/version.h>
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#include <generated/utsrelease.h>
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#include <linux/utsname.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/configfs.h>
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#include <linux/ctype.h>
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#include <linux/hash.h>
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#include <linux/ratelimit.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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#include <target/target_core_base.h>
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#include <target/target_core_transport.h>
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#include <target/target_core_fabric_ops.h>
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#include <target/target_core_device.h>
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#include <target/target_core_tpg.h>
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#include <target/target_core_configfs.h>
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#include <target/configfs_macros.h>
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#include "tcm_fc.h"
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/*
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* Deliver read data back to initiator.
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* XXX TBD handle resource problems later.
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*/
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int ft_queue_data_in(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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struct fc_frame *fp = NULL;
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struct fc_exch *ep;
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struct fc_lport *lport;
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struct scatterlist *sg = NULL;
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size_t remaining;
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u32 f_ctl = FC_FC_EX_CTX | FC_FC_REL_OFF;
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u32 mem_off = 0;
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u32 fh_off = 0;
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u32 frame_off = 0;
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size_t frame_len = 0;
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size_t mem_len = 0;
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size_t tlen;
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size_t off_in_page;
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struct page *page = NULL;
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int use_sg;
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int error;
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void *page_addr;
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void *from;
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void *to = NULL;
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ep = fc_seq_exch(cmd->seq);
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lport = ep->lp;
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cmd->seq = lport->tt.seq_start_next(cmd->seq);
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remaining = se_cmd->data_length;
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/*
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* Setup to use first mem list entry, unless no data.
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*/
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BUG_ON(remaining && !se_cmd->t_data_sg);
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if (remaining) {
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sg = se_cmd->t_data_sg;
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mem_len = sg->length;
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mem_off = sg->offset;
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page = sg_page(sg);
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}
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/* no scatter/gather in skb for odd word length due to fc_seq_send() */
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use_sg = !(remaining % 4);
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while (remaining) {
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if (!mem_len) {
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sg = sg_next(sg);
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mem_len = min((size_t)sg->length, remaining);
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mem_off = sg->offset;
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page = sg_page(sg);
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}
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if (!frame_len) {
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/*
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* If lport's has capability of Large Send Offload LSO)
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* , then allow 'frame_len' to be as big as 'lso_max'
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* if indicated transfer length is >= lport->lso_max
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*/
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frame_len = (lport->seq_offload) ? lport->lso_max :
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cmd->sess->max_frame;
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frame_len = min(frame_len, remaining);
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fp = fc_frame_alloc(lport, use_sg ? 0 : frame_len);
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if (!fp)
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return -ENOMEM;
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to = fc_frame_payload_get(fp, 0);
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fh_off = frame_off;
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frame_off += frame_len;
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/*
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* Setup the frame's max payload which is used by base
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* driver to indicate HW about max frame size, so that
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* HW can do fragmentation appropriately based on
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* "gso_max_size" of underline netdev.
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*/
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fr_max_payload(fp) = cmd->sess->max_frame;
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}
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tlen = min(mem_len, frame_len);
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if (use_sg) {
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off_in_page = mem_off;
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BUG_ON(!page);
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get_page(page);
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skb_fill_page_desc(fp_skb(fp),
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skb_shinfo(fp_skb(fp))->nr_frags,
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page, off_in_page, tlen);
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fr_len(fp) += tlen;
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fp_skb(fp)->data_len += tlen;
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fp_skb(fp)->truesize +=
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PAGE_SIZE << compound_order(page);
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} else {
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BUG_ON(!page);
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from = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
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KM_SOFTIRQ0);
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page_addr = from;
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from += mem_off & ~PAGE_MASK;
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tlen = min(tlen, (size_t)(PAGE_SIZE -
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(mem_off & ~PAGE_MASK)));
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memcpy(to, from, tlen);
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kunmap_atomic(page_addr, KM_SOFTIRQ0);
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to += tlen;
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}
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mem_off += tlen;
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mem_len -= tlen;
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frame_len -= tlen;
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remaining -= tlen;
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if (frame_len &&
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(skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN))
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continue;
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if (!remaining)
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f_ctl |= FC_FC_END_SEQ;
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fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
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FC_TYPE_FCP, f_ctl, fh_off);
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error = lport->tt.seq_send(lport, cmd->seq, fp);
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if (error) {
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/* XXX For now, initiator will retry */
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pr_err_ratelimited("%s: Failed to send frame %p, "
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"xid <0x%x>, remaining %zu, "
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"lso_max <0x%x>\n",
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__func__, fp, ep->xid,
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remaining, lport->lso_max);
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}
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}
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return ft_queue_status(se_cmd);
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}
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/*
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* Receive write data frame.
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*/
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void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
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{
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struct se_cmd *se_cmd = &cmd->se_cmd;
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struct fc_seq *seq = cmd->seq;
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struct fc_exch *ep;
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struct fc_lport *lport;
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struct fc_frame_header *fh;
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struct scatterlist *sg = NULL;
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u32 mem_off = 0;
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u32 rel_off;
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size_t frame_len;
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size_t mem_len = 0;
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size_t tlen;
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struct page *page = NULL;
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void *page_addr;
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void *from;
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void *to;
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u32 f_ctl;
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void *buf;
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fh = fc_frame_header_get(fp);
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if (!(ntoh24(fh->fh_f_ctl) & FC_FC_REL_OFF))
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goto drop;
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/*
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* Doesn't expect even single byte of payload. Payload
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* is expected to be copied directly to user buffers
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* due to DDP (Large Rx offload) feature, hence
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* BUG_ON if BUF is non-NULL
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*/
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buf = fc_frame_payload_get(fp, 1);
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if (cmd->was_ddp_setup && buf) {
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pr_debug("%s: When DDP was setup, not expected to"
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"receive frame with payload, Payload shall be"
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"copied directly to buffer instead of coming "
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"via. legacy receive queues\n", __func__);
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BUG_ON(buf);
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}
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/*
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* If ft_cmd indicated 'ddp_setup', in that case only the last frame
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* should come with 'TSI bit being set'. If 'TSI bit is not set and if
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* data frame appears here, means error condition. In both the cases
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* release the DDP context (ddp_put) and in error case, as well
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* initiate error recovery mechanism.
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*/
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ep = fc_seq_exch(seq);
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if (cmd->was_ddp_setup) {
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BUG_ON(!ep);
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lport = ep->lp;
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BUG_ON(!lport);
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}
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if (cmd->was_ddp_setup && ep->xid != FC_XID_UNKNOWN) {
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f_ctl = ntoh24(fh->fh_f_ctl);
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/*
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* If TSI bit set in f_ctl, means last write data frame is
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* received successfully where payload is posted directly
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* to user buffer and only the last frame's header is posted
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* in legacy receive queue
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*/
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if (f_ctl & FC_FC_SEQ_INIT) { /* TSI bit set in FC frame */
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cmd->write_data_len = lport->tt.ddp_done(lport,
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ep->xid);
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goto last_frame;
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} else {
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/*
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* Updating the write_data_len may be meaningless at
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* this point, but just in case if required in future
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* for debugging or any other purpose
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*/
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pr_err("%s: Received frame with TSI bit not"
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" being SET, dropping the frame, "
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"cmd->sg <%p>, cmd->sg_cnt <0x%x>\n",
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__func__, cmd->sg, cmd->sg_cnt);
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cmd->write_data_len = lport->tt.ddp_done(lport,
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ep->xid);
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lport->tt.seq_exch_abort(cmd->seq, 0);
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goto drop;
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}
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}
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rel_off = ntohl(fh->fh_parm_offset);
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frame_len = fr_len(fp);
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if (frame_len <= sizeof(*fh))
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goto drop;
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frame_len -= sizeof(*fh);
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from = fc_frame_payload_get(fp, 0);
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if (rel_off >= se_cmd->data_length)
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goto drop;
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if (frame_len + rel_off > se_cmd->data_length)
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frame_len = se_cmd->data_length - rel_off;
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/*
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* Setup to use first mem list entry, unless no data.
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*/
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BUG_ON(frame_len && !se_cmd->t_data_sg);
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if (frame_len) {
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sg = se_cmd->t_data_sg;
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mem_len = sg->length;
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mem_off = sg->offset;
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page = sg_page(sg);
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}
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while (frame_len) {
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if (!mem_len) {
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sg = sg_next(sg);
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mem_len = sg->length;
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mem_off = sg->offset;
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page = sg_page(sg);
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}
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if (rel_off >= mem_len) {
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rel_off -= mem_len;
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mem_len = 0;
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continue;
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}
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mem_off += rel_off;
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mem_len -= rel_off;
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rel_off = 0;
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tlen = min(mem_len, frame_len);
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to = kmap_atomic(page + (mem_off >> PAGE_SHIFT),
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KM_SOFTIRQ0);
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page_addr = to;
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to += mem_off & ~PAGE_MASK;
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tlen = min(tlen, (size_t)(PAGE_SIZE -
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(mem_off & ~PAGE_MASK)));
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memcpy(to, from, tlen);
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kunmap_atomic(page_addr, KM_SOFTIRQ0);
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from += tlen;
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frame_len -= tlen;
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mem_off += tlen;
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mem_len -= tlen;
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cmd->write_data_len += tlen;
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}
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last_frame:
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if (cmd->write_data_len == se_cmd->data_length)
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transport_generic_handle_data(se_cmd);
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drop:
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fc_frame_free(fp);
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}
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