375 lines
9.5 KiB
C
375 lines
9.5 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/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/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_fabric.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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if (cmd->aborted)
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return 0;
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if (se_cmd->scsi_status == SAM_STAT_TASK_SET_FULL)
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goto queue_status;
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ep = fc_seq_exch(cmd->seq);
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lport = ep->lp;
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cmd->seq = fc_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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struct fc_seq *seq = cmd->seq;
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if (!seq) {
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pr_debug("%s: Command aborted, xid 0x%x\n",
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__func__, ep->xid);
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break;
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}
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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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page_addr = from;
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from += offset_in_page(mem_off);
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tlen = min(tlen, (size_t)(PAGE_SIZE -
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offset_in_page(mem_off)));
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memcpy(to, from, tlen);
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kunmap_atomic(page_addr);
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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 = fc_seq_send(lport, seq, fp);
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if (error) {
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pr_info_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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* Go ahead and set TASK_SET_FULL status ignoring the
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* rest of the DataIN, and immediately attempt to
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* send the response via ft_queue_status() in order
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* to notify the initiator that it should reduce it's
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* per LUN queue_depth.
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*/
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se_cmd->scsi_status = SAM_STAT_TASK_SET_FULL;
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break;
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}
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}
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queue_status:
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return ft_queue_status(se_cmd);
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}
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static void ft_execute_work(struct work_struct *work)
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{
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struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
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target_execute_cmd(&cmd->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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f_ctl = ntoh24(fh->fh_f_ctl);
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ep = fc_seq_exch(seq);
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lport = ep->lp;
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if (cmd->was_ddp_setup) {
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BUG_ON(!ep);
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BUG_ON(!lport);
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/*
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* Since DDP (Large Rx offload) was setup for this request,
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* payload is expected to be copied directly to user buffers.
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*/
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buf = fc_frame_payload_get(fp, 1);
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if (buf)
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pr_err("%s: xid 0x%x, f_ctl 0x%x, cmd->sg %p, "
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"cmd->sg_cnt 0x%x. DDP was setup"
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" hence not expected to receive frame with "
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"payload, Frame will be dropped if"
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"'Sequence Initiative' bit in f_ctl is"
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"not set\n", __func__, ep->xid, f_ctl,
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se_cmd->t_data_sg, se_cmd->t_data_nents);
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/*
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* Invalidate HW DDP context if it was setup for respective
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* command. Invalidation of HW DDP context is requited in both
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* situation (success and error).
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*/
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ft_invl_hw_context(cmd);
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/*
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* If "Sequence Initiative (TSI)" bit set in f_ctl, means last
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* write data frame is received successfully where payload is
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* posted directly to user buffer and only the last frame's
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* header is posted in receive queue.
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*
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* If "Sequence Initiative (TSI)" bit is not set, means error
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* condition w.r.t. DDP, hence drop the packet and let explict
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* ABORTS from other end of exchange timer trigger the recovery.
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*/
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if (f_ctl & FC_FC_SEQ_INIT)
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goto last_frame;
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else
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goto drop;
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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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page_addr = to;
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to += offset_in_page(mem_off);
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tlen = min(tlen, (size_t)(PAGE_SIZE -
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offset_in_page(mem_off)));
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memcpy(to, from, tlen);
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kunmap_atomic(page_addr);
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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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INIT_WORK(&cmd->work, ft_execute_work);
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queue_work(cmd->sess->tport->tpg->workqueue, &cmd->work);
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}
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drop:
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fc_frame_free(fp);
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}
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/*
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* Handle and cleanup any HW specific resources if
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* received ABORTS, errors, timeouts.
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*/
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void ft_invl_hw_context(struct ft_cmd *cmd)
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{
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struct fc_seq *seq;
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struct fc_exch *ep = NULL;
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struct fc_lport *lport = NULL;
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BUG_ON(!cmd);
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seq = cmd->seq;
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/* Cleanup the DDP context in HW if DDP was setup */
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if (cmd->was_ddp_setup && seq) {
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ep = fc_seq_exch(seq);
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if (ep) {
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lport = ep->lp;
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if (lport && (ep->xid <= lport->lro_xid)) {
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/*
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* "ddp_done" trigger invalidation of HW
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* specific DDP context
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*/
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cmd->write_data_len = lport->tt.ddp_done(lport,
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ep->xid);
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/*
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* Resetting same variable to indicate HW's
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* DDP context has been invalidated to avoid
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* re_invalidation of same context (context is
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* identified using ep->xid)
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*/
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cmd->was_ddp_setup = 0;
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}
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}
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}
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}
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