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1070 lines
28 KiB
1070 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* iSCSI Initiator over TCP/IP Data-Path |
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* |
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* Copyright (C) 2004 Dmitry Yusupov |
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* Copyright (C) 2004 Alex Aizman |
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* Copyright (C) 2005 - 2006 Mike Christie |
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* Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
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* maintained by [email protected] |
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* |
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* See the file COPYING included with this distribution for more details. |
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* |
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* Credits: |
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* Christoph Hellwig |
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* FUJITA Tomonori |
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* Arne Redlich |
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* Zhenyu Wang |
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*/ |
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|
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#include <crypto/hash.h> |
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#include <linux/types.h> |
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#include <linux/inet.h> |
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#include <linux/slab.h> |
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#include <linux/sched/mm.h> |
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#include <linux/file.h> |
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#include <linux/blkdev.h> |
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#include <linux/delay.h> |
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#include <linux/kfifo.h> |
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#include <linux/scatterlist.h> |
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#include <linux/module.h> |
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#include <linux/backing-dev.h> |
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#include <net/tcp.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_transport_iscsi.h> |
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#include <trace/events/iscsi.h> |
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|
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#include "iscsi_tcp.h" |
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|
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MODULE_AUTHOR("Mike Christie <[email protected]>, " |
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"Dmitry Yusupov <[email protected]>, " |
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"Alex Aizman <[email protected]>"); |
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MODULE_DESCRIPTION("iSCSI/TCP data-path"); |
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MODULE_LICENSE("GPL"); |
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|
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static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
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static struct scsi_host_template iscsi_sw_tcp_sht; |
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static struct iscsi_transport iscsi_sw_tcp_transport; |
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|
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static unsigned int iscsi_max_lun = ~0; |
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module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
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|
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static int iscsi_sw_tcp_dbg; |
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module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, |
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S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " |
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"Set to 1 to turn on, and zero to turn off. Default is off."); |
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|
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#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ |
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do { \ |
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if (iscsi_sw_tcp_dbg) \ |
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iscsi_conn_printk(KERN_INFO, _conn, \ |
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"%s " dbg_fmt, \ |
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__func__, ##arg); \ |
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iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \ |
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&(_conn)->cls_conn->dev, \ |
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"%s " dbg_fmt, __func__, ##arg);\ |
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} while (0); |
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|
|
|
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/** |
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* iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
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* @rd_desc: read descriptor |
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* @skb: socket buffer |
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* @offset: offset in skb |
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* @len: skb->len - offset |
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*/ |
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static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
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unsigned int offset, size_t len) |
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{ |
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struct iscsi_conn *conn = rd_desc->arg.data; |
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unsigned int consumed, total_consumed = 0; |
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int status; |
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|
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ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
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|
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do { |
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status = 0; |
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consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); |
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offset += consumed; |
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total_consumed += consumed; |
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} while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); |
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|
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ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
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skb->len - offset, status); |
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return total_consumed; |
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} |
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|
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/** |
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* iscsi_sw_sk_state_check - check socket state |
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* @sk: socket |
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* |
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* If the socket is in CLOSE or CLOSE_WAIT we should |
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* not close the connection if there is still some |
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* data pending. |
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* |
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* Must be called with sk_callback_lock. |
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*/ |
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static inline int iscsi_sw_sk_state_check(struct sock *sk) |
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{ |
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struct iscsi_conn *conn = sk->sk_user_data; |
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|
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if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
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(conn->session->state != ISCSI_STATE_LOGGING_OUT) && |
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!atomic_read(&sk->sk_rmem_alloc)) { |
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ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
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iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); |
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return -ECONNRESET; |
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} |
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return 0; |
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} |
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static void iscsi_sw_tcp_data_ready(struct sock *sk) |
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{ |
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struct iscsi_conn *conn; |
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struct iscsi_tcp_conn *tcp_conn; |
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read_descriptor_t rd_desc; |
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|
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read_lock_bh(&sk->sk_callback_lock); |
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conn = sk->sk_user_data; |
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if (!conn) { |
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read_unlock_bh(&sk->sk_callback_lock); |
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return; |
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} |
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tcp_conn = conn->dd_data; |
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|
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/* |
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* Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
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* We set count to 1 because we want the network layer to |
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* hand us all the skbs that are available. iscsi_tcp_recv |
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* handled pdus that cross buffers or pdus that still need data. |
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*/ |
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rd_desc.arg.data = conn; |
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rd_desc.count = 1; |
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tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
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|
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iscsi_sw_sk_state_check(sk); |
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|
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/* If we had to (atomically) map a highmem page, |
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* unmap it now. */ |
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iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
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read_unlock_bh(&sk->sk_callback_lock); |
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} |
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|
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static void iscsi_sw_tcp_state_change(struct sock *sk) |
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{ |
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struct iscsi_tcp_conn *tcp_conn; |
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struct iscsi_sw_tcp_conn *tcp_sw_conn; |
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struct iscsi_conn *conn; |
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void (*old_state_change)(struct sock *); |
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|
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read_lock_bh(&sk->sk_callback_lock); |
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conn = sk->sk_user_data; |
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if (!conn) { |
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read_unlock_bh(&sk->sk_callback_lock); |
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return; |
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} |
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iscsi_sw_sk_state_check(sk); |
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|
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tcp_conn = conn->dd_data; |
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tcp_sw_conn = tcp_conn->dd_data; |
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old_state_change = tcp_sw_conn->old_state_change; |
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|
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read_unlock_bh(&sk->sk_callback_lock); |
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|
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old_state_change(sk); |
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} |
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|
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/** |
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* iscsi_sw_tcp_write_space - Called when more output buffer space is available |
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* @sk: socket space is available for |
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**/ |
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static void iscsi_sw_tcp_write_space(struct sock *sk) |
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{ |
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struct iscsi_conn *conn; |
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struct iscsi_tcp_conn *tcp_conn; |
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struct iscsi_sw_tcp_conn *tcp_sw_conn; |
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void (*old_write_space)(struct sock *); |
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|
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read_lock_bh(&sk->sk_callback_lock); |
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conn = sk->sk_user_data; |
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if (!conn) { |
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read_unlock_bh(&sk->sk_callback_lock); |
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return; |
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} |
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|
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tcp_conn = conn->dd_data; |
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tcp_sw_conn = tcp_conn->dd_data; |
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old_write_space = tcp_sw_conn->old_write_space; |
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read_unlock_bh(&sk->sk_callback_lock); |
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|
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old_write_space(sk); |
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|
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ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
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iscsi_conn_queue_work(conn); |
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} |
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static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
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{ |
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
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struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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struct sock *sk = tcp_sw_conn->sock->sk; |
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|
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/* assign new callbacks */ |
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write_lock_bh(&sk->sk_callback_lock); |
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sk->sk_user_data = conn; |
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tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
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tcp_sw_conn->old_state_change = sk->sk_state_change; |
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tcp_sw_conn->old_write_space = sk->sk_write_space; |
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sk->sk_data_ready = iscsi_sw_tcp_data_ready; |
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sk->sk_state_change = iscsi_sw_tcp_state_change; |
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sk->sk_write_space = iscsi_sw_tcp_write_space; |
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write_unlock_bh(&sk->sk_callback_lock); |
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} |
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|
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static void |
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iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
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{ |
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
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struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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struct sock *sk = tcp_sw_conn->sock->sk; |
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|
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/* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ |
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write_lock_bh(&sk->sk_callback_lock); |
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sk->sk_user_data = NULL; |
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sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
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sk->sk_state_change = tcp_sw_conn->old_state_change; |
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sk->sk_write_space = tcp_sw_conn->old_write_space; |
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sk->sk_no_check_tx = 0; |
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write_unlock_bh(&sk->sk_callback_lock); |
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} |
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|
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/** |
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* iscsi_sw_tcp_xmit_segment - transmit segment |
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* @tcp_conn: the iSCSI TCP connection |
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* @segment: the buffer to transmnit |
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* |
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* This function transmits as much of the buffer as |
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* the network layer will accept, and returns the number of |
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* bytes transmitted. |
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* |
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* If CRC hashing is enabled, the function will compute the |
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* hash as it goes. When the entire segment has been transmitted, |
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* it will retrieve the hash value and send it as well. |
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*/ |
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static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
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struct iscsi_segment *segment) |
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{ |
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struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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struct socket *sk = tcp_sw_conn->sock; |
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unsigned int copied = 0; |
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int r = 0; |
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|
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while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
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struct scatterlist *sg; |
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unsigned int offset, copy; |
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int flags = 0; |
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|
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r = 0; |
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offset = segment->copied; |
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copy = segment->size - offset; |
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|
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if (segment->total_copied + segment->size < segment->total_size) |
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flags |= MSG_MORE; |
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|
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/* Use sendpage if we can; else fall back to sendmsg */ |
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if (!segment->data) { |
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sg = segment->sg; |
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offset += segment->sg_offset + sg->offset; |
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r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, |
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copy, flags); |
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} else { |
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struct msghdr msg = { .msg_flags = flags }; |
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struct kvec iov = { |
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.iov_base = segment->data + offset, |
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.iov_len = copy |
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}; |
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|
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r = kernel_sendmsg(sk, &msg, &iov, 1, copy); |
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} |
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|
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if (r < 0) { |
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iscsi_tcp_segment_unmap(segment); |
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return r; |
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} |
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copied += r; |
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} |
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return copied; |
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} |
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|
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/** |
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* iscsi_sw_tcp_xmit - TCP transmit |
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* @conn: iscsi connection |
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**/ |
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static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
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{ |
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
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struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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struct iscsi_segment *segment = &tcp_sw_conn->out.segment; |
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unsigned int consumed = 0; |
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int rc = 0; |
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|
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while (1) { |
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rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
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/* |
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* We may not have been able to send data because the conn |
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* is getting stopped. libiscsi will know so propagate err |
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* for it to do the right thing. |
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*/ |
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if (rc == -EAGAIN) |
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return rc; |
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else if (rc < 0) { |
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rc = ISCSI_ERR_XMIT_FAILED; |
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goto error; |
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} else if (rc == 0) |
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break; |
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|
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consumed += rc; |
|
|
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if (segment->total_copied >= segment->total_size) { |
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if (segment->done != NULL) { |
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rc = segment->done(tcp_conn, segment); |
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if (rc != 0) |
|
goto error; |
|
} |
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} |
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} |
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|
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ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
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|
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conn->txdata_octets += consumed; |
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return consumed; |
|
|
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error: |
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/* Transmit error. We could initiate error recovery |
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* here. */ |
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ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
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iscsi_conn_failure(conn, rc); |
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return -EIO; |
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} |
|
|
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/** |
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* iscsi_sw_tcp_xmit_qlen - return the number of bytes queued for xmit |
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* @conn: iscsi connection |
|
*/ |
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static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
|
{ |
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struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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struct iscsi_segment *segment = &tcp_sw_conn->out.segment; |
|
|
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return segment->total_copied - segment->total_size; |
|
} |
|
|
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static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
|
{ |
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struct iscsi_conn *conn = task->conn; |
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unsigned int noreclaim_flag; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
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int rc = 0; |
|
|
|
if (!tcp_sw_conn->sock) { |
|
iscsi_conn_printk(KERN_ERR, conn, |
|
"Transport not bound to socket!\n"); |
|
return -EINVAL; |
|
} |
|
|
|
noreclaim_flag = memalloc_noreclaim_save(); |
|
|
|
while (iscsi_sw_tcp_xmit_qlen(conn)) { |
|
rc = iscsi_sw_tcp_xmit(conn); |
|
if (rc == 0) { |
|
rc = -EAGAIN; |
|
break; |
|
} |
|
if (rc < 0) |
|
break; |
|
rc = 0; |
|
} |
|
|
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memalloc_noreclaim_restore(noreclaim_flag); |
|
return rc; |
|
} |
|
|
|
/* |
|
* This is called when we're done sending the header. |
|
* Simply copy the data_segment to the send segment, and return. |
|
*/ |
|
static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
|
struct iscsi_segment *segment) |
|
{ |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; |
|
ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
|
"Header done. Next segment size %u total_size %u\n", |
|
tcp_sw_conn->out.segment.size, |
|
tcp_sw_conn->out.segment.total_size); |
|
return 0; |
|
} |
|
|
|
static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
|
size_t hdrlen) |
|
{ |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
|
"digest enabled" : "digest disabled"); |
|
|
|
/* Clear the data segment - needs to be filled in by the |
|
* caller using iscsi_tcp_send_data_prep() */ |
|
memset(&tcp_sw_conn->out.data_segment, 0, |
|
sizeof(struct iscsi_segment)); |
|
|
|
/* If header digest is enabled, compute the CRC and |
|
* place the digest into the same buffer. We make |
|
* sure that both iscsi_tcp_task and mtask have |
|
* sufficient room. |
|
*/ |
|
if (conn->hdrdgst_en) { |
|
iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen, |
|
hdr + hdrlen); |
|
hdrlen += ISCSI_DIGEST_SIZE; |
|
} |
|
|
|
/* Remember header pointer for later, when we need |
|
* to decide whether there's a payload to go along |
|
* with the header. */ |
|
tcp_sw_conn->out.hdr = hdr; |
|
|
|
iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
|
iscsi_sw_tcp_send_hdr_done, NULL); |
|
} |
|
|
|
/* |
|
* Prepare the send buffer for the payload data. |
|
* Padding and checksumming will all be taken care |
|
* of by the iscsi_segment routines. |
|
*/ |
|
static int |
|
iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
|
unsigned int count, unsigned int offset, |
|
unsigned int len) |
|
{ |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct ahash_request *tx_hash = NULL; |
|
unsigned int hdr_spec_len; |
|
|
|
ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
|
conn->datadgst_en ? |
|
"digest enabled" : "digest disabled"); |
|
|
|
/* Make sure the datalen matches what the caller |
|
said he would send. */ |
|
hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
|
|
|
if (conn->datadgst_en) |
|
tx_hash = tcp_sw_conn->tx_hash; |
|
|
|
return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
|
sg, count, offset, len, |
|
NULL, tx_hash); |
|
} |
|
|
|
static void |
|
iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
|
size_t len) |
|
{ |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct ahash_request *tx_hash = NULL; |
|
unsigned int hdr_spec_len; |
|
|
|
ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
|
"digest enabled" : "digest disabled"); |
|
|
|
/* Make sure the datalen matches what the caller |
|
said he would send. */ |
|
hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
|
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
|
|
|
if (conn->datadgst_en) |
|
tx_hash = tcp_sw_conn->tx_hash; |
|
|
|
iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
|
data, len, NULL, tx_hash); |
|
} |
|
|
|
static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
|
unsigned int offset, unsigned int count) |
|
{ |
|
struct iscsi_conn *conn = task->conn; |
|
int err = 0; |
|
|
|
iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
|
|
|
if (!count) |
|
return 0; |
|
|
|
if (!task->sc) |
|
iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
|
else { |
|
struct scsi_data_buffer *sdb = &task->sc->sdb; |
|
|
|
err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
|
sdb->table.nents, offset, |
|
count); |
|
} |
|
|
|
if (err) { |
|
/* got invalid offset/len */ |
|
return -EIO; |
|
} |
|
return 0; |
|
} |
|
|
|
static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
|
{ |
|
struct iscsi_tcp_task *tcp_task = task->dd_data; |
|
|
|
task->hdr = task->dd_data + sizeof(*tcp_task); |
|
task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; |
|
return 0; |
|
} |
|
|
|
static struct iscsi_cls_conn * |
|
iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
|
uint32_t conn_idx) |
|
{ |
|
struct iscsi_conn *conn; |
|
struct iscsi_cls_conn *cls_conn; |
|
struct iscsi_tcp_conn *tcp_conn; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn; |
|
struct crypto_ahash *tfm; |
|
|
|
cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
|
conn_idx); |
|
if (!cls_conn) |
|
return NULL; |
|
conn = cls_conn->dd_data; |
|
tcp_conn = conn->dd_data; |
|
tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
|
if (IS_ERR(tfm)) |
|
goto free_conn; |
|
|
|
tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
|
if (!tcp_sw_conn->tx_hash) |
|
goto free_tfm; |
|
ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); |
|
|
|
tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
|
if (!tcp_sw_conn->rx_hash) |
|
goto free_tx_hash; |
|
ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); |
|
|
|
tcp_conn->rx_hash = tcp_sw_conn->rx_hash; |
|
|
|
return cls_conn; |
|
|
|
free_tx_hash: |
|
ahash_request_free(tcp_sw_conn->tx_hash); |
|
free_tfm: |
|
crypto_free_ahash(tfm); |
|
free_conn: |
|
iscsi_conn_printk(KERN_ERR, conn, |
|
"Could not create connection due to crc32c " |
|
"loading error. Make sure the crc32c " |
|
"module is built as a module or into the " |
|
"kernel\n"); |
|
iscsi_tcp_conn_teardown(cls_conn); |
|
return NULL; |
|
} |
|
|
|
static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
|
{ |
|
struct iscsi_session *session = conn->session; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct socket *sock = tcp_sw_conn->sock; |
|
|
|
if (!sock) |
|
return; |
|
|
|
/* |
|
* Make sure we start socket shutdown now in case userspace is up |
|
* but delayed in releasing the socket. |
|
*/ |
|
kernel_sock_shutdown(sock, SHUT_RDWR); |
|
|
|
sock_hold(sock->sk); |
|
iscsi_sw_tcp_conn_restore_callbacks(conn); |
|
sock_put(sock->sk); |
|
|
|
spin_lock_bh(&session->frwd_lock); |
|
tcp_sw_conn->sock = NULL; |
|
spin_unlock_bh(&session->frwd_lock); |
|
sockfd_put(sock); |
|
} |
|
|
|
static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
iscsi_sw_tcp_release_conn(conn); |
|
|
|
ahash_request_free(tcp_sw_conn->rx_hash); |
|
if (tcp_sw_conn->tx_hash) { |
|
struct crypto_ahash *tfm; |
|
|
|
tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); |
|
ahash_request_free(tcp_sw_conn->tx_hash); |
|
crypto_free_ahash(tfm); |
|
} |
|
|
|
iscsi_tcp_conn_teardown(cls_conn); |
|
} |
|
|
|
static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct socket *sock = tcp_sw_conn->sock; |
|
|
|
/* userspace may have goofed up and not bound us */ |
|
if (!sock) |
|
return; |
|
|
|
sock->sk->sk_err = EIO; |
|
wake_up_interruptible(sk_sleep(sock->sk)); |
|
|
|
/* stop xmit side */ |
|
iscsi_suspend_tx(conn); |
|
|
|
/* stop recv side and release socket */ |
|
iscsi_sw_tcp_release_conn(conn); |
|
|
|
iscsi_conn_stop(cls_conn, flag); |
|
} |
|
|
|
static int |
|
iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
|
struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, |
|
int is_leading) |
|
{ |
|
struct iscsi_session *session = cls_session->dd_data; |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct sock *sk; |
|
struct socket *sock; |
|
int err; |
|
|
|
/* lookup for existing socket */ |
|
sock = sockfd_lookup((int)transport_eph, &err); |
|
if (!sock) { |
|
iscsi_conn_printk(KERN_ERR, conn, |
|
"sockfd_lookup failed %d\n", err); |
|
return -EEXIST; |
|
} |
|
|
|
err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
|
if (err) |
|
goto free_socket; |
|
|
|
spin_lock_bh(&session->frwd_lock); |
|
/* bind iSCSI connection and socket */ |
|
tcp_sw_conn->sock = sock; |
|
spin_unlock_bh(&session->frwd_lock); |
|
|
|
/* setup Socket parameters */ |
|
sk = sock->sk; |
|
sk->sk_reuse = SK_CAN_REUSE; |
|
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
|
sk->sk_allocation = GFP_ATOMIC; |
|
sk_set_memalloc(sk); |
|
sock_no_linger(sk); |
|
|
|
iscsi_sw_tcp_conn_set_callbacks(conn); |
|
tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; |
|
/* |
|
* set receive state machine into initial state |
|
*/ |
|
iscsi_tcp_hdr_recv_prep(tcp_conn); |
|
return 0; |
|
|
|
free_socket: |
|
sockfd_put(sock); |
|
return err; |
|
} |
|
|
|
static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
|
enum iscsi_param param, char *buf, |
|
int buflen) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
switch(param) { |
|
case ISCSI_PARAM_HDRDGST_EN: |
|
iscsi_set_param(cls_conn, param, buf, buflen); |
|
break; |
|
case ISCSI_PARAM_DATADGST_EN: |
|
iscsi_set_param(cls_conn, param, buf, buflen); |
|
tcp_sw_conn->sendpage = conn->datadgst_en ? |
|
sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; |
|
break; |
|
case ISCSI_PARAM_MAX_R2T: |
|
return iscsi_tcp_set_max_r2t(conn, buf); |
|
default: |
|
return iscsi_set_param(cls_conn, param, buf, buflen); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
|
enum iscsi_param param, char *buf) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
struct sockaddr_in6 addr; |
|
struct socket *sock; |
|
int rc; |
|
|
|
switch(param) { |
|
case ISCSI_PARAM_CONN_PORT: |
|
case ISCSI_PARAM_CONN_ADDRESS: |
|
case ISCSI_PARAM_LOCAL_PORT: |
|
spin_lock_bh(&conn->session->frwd_lock); |
|
if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
|
spin_unlock_bh(&conn->session->frwd_lock); |
|
return -ENOTCONN; |
|
} |
|
sock = tcp_sw_conn->sock; |
|
sock_hold(sock->sk); |
|
spin_unlock_bh(&conn->session->frwd_lock); |
|
|
|
if (param == ISCSI_PARAM_LOCAL_PORT) |
|
rc = kernel_getsockname(sock, |
|
(struct sockaddr *)&addr); |
|
else |
|
rc = kernel_getpeername(sock, |
|
(struct sockaddr *)&addr); |
|
sock_put(sock->sk); |
|
if (rc < 0) |
|
return rc; |
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *) |
|
&addr, param, buf); |
|
default: |
|
return iscsi_conn_get_param(cls_conn, param, buf); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, |
|
enum iscsi_host_param param, char *buf) |
|
{ |
|
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); |
|
struct iscsi_session *session = tcp_sw_host->session; |
|
struct iscsi_conn *conn; |
|
struct iscsi_tcp_conn *tcp_conn; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn; |
|
struct sockaddr_in6 addr; |
|
struct socket *sock; |
|
int rc; |
|
|
|
switch (param) { |
|
case ISCSI_HOST_PARAM_IPADDRESS: |
|
if (!session) |
|
return -ENOTCONN; |
|
|
|
spin_lock_bh(&session->frwd_lock); |
|
conn = session->leadconn; |
|
if (!conn) { |
|
spin_unlock_bh(&session->frwd_lock); |
|
return -ENOTCONN; |
|
} |
|
tcp_conn = conn->dd_data; |
|
tcp_sw_conn = tcp_conn->dd_data; |
|
sock = tcp_sw_conn->sock; |
|
if (!sock) { |
|
spin_unlock_bh(&session->frwd_lock); |
|
return -ENOTCONN; |
|
} |
|
sock_hold(sock->sk); |
|
spin_unlock_bh(&session->frwd_lock); |
|
|
|
rc = kernel_getsockname(sock, |
|
(struct sockaddr *)&addr); |
|
sock_put(sock->sk); |
|
if (rc < 0) |
|
return rc; |
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *) |
|
&addr, |
|
(enum iscsi_param)param, buf); |
|
default: |
|
return iscsi_host_get_param(shost, param, buf); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
|
struct iscsi_stats *stats) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
|
struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
|
|
|
stats->custom_length = 3; |
|
strcpy(stats->custom[0].desc, "tx_sendpage_failures"); |
|
stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
|
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
|
stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
|
strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
|
stats->custom[2].value = conn->eh_abort_cnt; |
|
|
|
iscsi_tcp_conn_get_stats(cls_conn, stats); |
|
} |
|
|
|
static struct iscsi_cls_session * |
|
iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
|
uint16_t qdepth, uint32_t initial_cmdsn) |
|
{ |
|
struct iscsi_cls_session *cls_session; |
|
struct iscsi_session *session; |
|
struct iscsi_sw_tcp_host *tcp_sw_host; |
|
struct Scsi_Host *shost; |
|
int rc; |
|
|
|
if (ep) { |
|
printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); |
|
return NULL; |
|
} |
|
|
|
shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
|
sizeof(struct iscsi_sw_tcp_host), 1); |
|
if (!shost) |
|
return NULL; |
|
shost->transportt = iscsi_sw_tcp_scsi_transport; |
|
shost->cmd_per_lun = qdepth; |
|
shost->max_lun = iscsi_max_lun; |
|
shost->max_id = 0; |
|
shost->max_channel = 0; |
|
shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
|
|
|
rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
|
if (rc < 0) |
|
goto free_host; |
|
shost->can_queue = rc; |
|
|
|
if (iscsi_host_add(shost, NULL)) |
|
goto free_host; |
|
|
|
cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
|
cmds_max, 0, |
|
sizeof(struct iscsi_tcp_task) + |
|
sizeof(struct iscsi_sw_tcp_hdrbuf), |
|
initial_cmdsn, 0); |
|
if (!cls_session) |
|
goto remove_host; |
|
session = cls_session->dd_data; |
|
tcp_sw_host = iscsi_host_priv(shost); |
|
tcp_sw_host->session = session; |
|
|
|
if (iscsi_tcp_r2tpool_alloc(session)) |
|
goto remove_session; |
|
return cls_session; |
|
|
|
remove_session: |
|
iscsi_session_teardown(cls_session); |
|
remove_host: |
|
iscsi_host_remove(shost); |
|
free_host: |
|
iscsi_host_free(shost); |
|
return NULL; |
|
} |
|
|
|
static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
|
{ |
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
|
struct iscsi_session *session = cls_session->dd_data; |
|
|
|
if (WARN_ON_ONCE(session->leadconn)) |
|
return; |
|
|
|
iscsi_tcp_r2tpool_free(cls_session->dd_data); |
|
iscsi_session_teardown(cls_session); |
|
|
|
iscsi_host_remove(shost); |
|
iscsi_host_free(shost); |
|
} |
|
|
|
static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
|
{ |
|
switch (param_type) { |
|
case ISCSI_HOST_PARAM: |
|
switch (param) { |
|
case ISCSI_HOST_PARAM_NETDEV_NAME: |
|
case ISCSI_HOST_PARAM_HWADDRESS: |
|
case ISCSI_HOST_PARAM_IPADDRESS: |
|
case ISCSI_HOST_PARAM_INITIATOR_NAME: |
|
return S_IRUGO; |
|
default: |
|
return 0; |
|
} |
|
case ISCSI_PARAM: |
|
switch (param) { |
|
case ISCSI_PARAM_MAX_RECV_DLENGTH: |
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
|
case ISCSI_PARAM_HDRDGST_EN: |
|
case ISCSI_PARAM_DATADGST_EN: |
|
case ISCSI_PARAM_CONN_ADDRESS: |
|
case ISCSI_PARAM_CONN_PORT: |
|
case ISCSI_PARAM_LOCAL_PORT: |
|
case ISCSI_PARAM_EXP_STATSN: |
|
case ISCSI_PARAM_PERSISTENT_ADDRESS: |
|
case ISCSI_PARAM_PERSISTENT_PORT: |
|
case ISCSI_PARAM_PING_TMO: |
|
case ISCSI_PARAM_RECV_TMO: |
|
case ISCSI_PARAM_INITIAL_R2T_EN: |
|
case ISCSI_PARAM_MAX_R2T: |
|
case ISCSI_PARAM_IMM_DATA_EN: |
|
case ISCSI_PARAM_FIRST_BURST: |
|
case ISCSI_PARAM_MAX_BURST: |
|
case ISCSI_PARAM_PDU_INORDER_EN: |
|
case ISCSI_PARAM_DATASEQ_INORDER_EN: |
|
case ISCSI_PARAM_ERL: |
|
case ISCSI_PARAM_TARGET_NAME: |
|
case ISCSI_PARAM_TPGT: |
|
case ISCSI_PARAM_USERNAME: |
|
case ISCSI_PARAM_PASSWORD: |
|
case ISCSI_PARAM_USERNAME_IN: |
|
case ISCSI_PARAM_PASSWORD_IN: |
|
case ISCSI_PARAM_FAST_ABORT: |
|
case ISCSI_PARAM_ABORT_TMO: |
|
case ISCSI_PARAM_LU_RESET_TMO: |
|
case ISCSI_PARAM_TGT_RESET_TMO: |
|
case ISCSI_PARAM_IFACE_NAME: |
|
case ISCSI_PARAM_INITIATOR_NAME: |
|
return S_IRUGO; |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
|
{ |
|
struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); |
|
struct iscsi_session *session = tcp_sw_host->session; |
|
struct iscsi_conn *conn = session->leadconn; |
|
|
|
if (conn->datadgst_en) |
|
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, |
|
sdev->request_queue); |
|
blk_queue_dma_alignment(sdev->request_queue, 0); |
|
return 0; |
|
} |
|
|
|
static struct scsi_host_template iscsi_sw_tcp_sht = { |
|
.module = THIS_MODULE, |
|
.name = "iSCSI Initiator over TCP/IP", |
|
.queuecommand = iscsi_queuecommand, |
|
.change_queue_depth = scsi_change_queue_depth, |
|
.can_queue = ISCSI_TOTAL_CMDS_MAX, |
|
.sg_tablesize = 4096, |
|
.max_sectors = 0xFFFF, |
|
.cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
|
.eh_timed_out = iscsi_eh_cmd_timed_out, |
|
.eh_abort_handler = iscsi_eh_abort, |
|
.eh_device_reset_handler= iscsi_eh_device_reset, |
|
.eh_target_reset_handler = iscsi_eh_recover_target, |
|
.dma_boundary = PAGE_SIZE - 1, |
|
.slave_configure = iscsi_sw_tcp_slave_configure, |
|
.target_alloc = iscsi_target_alloc, |
|
.proc_name = "iscsi_tcp", |
|
.this_id = -1, |
|
.track_queue_depth = 1, |
|
}; |
|
|
|
static struct iscsi_transport iscsi_sw_tcp_transport = { |
|
.owner = THIS_MODULE, |
|
.name = "tcp", |
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
|
| CAP_DATADGST, |
|
/* session management */ |
|
.create_session = iscsi_sw_tcp_session_create, |
|
.destroy_session = iscsi_sw_tcp_session_destroy, |
|
/* connection management */ |
|
.create_conn = iscsi_sw_tcp_conn_create, |
|
.bind_conn = iscsi_sw_tcp_conn_bind, |
|
.destroy_conn = iscsi_sw_tcp_conn_destroy, |
|
.attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
|
.set_param = iscsi_sw_tcp_conn_set_param, |
|
.get_conn_param = iscsi_sw_tcp_conn_get_param, |
|
.get_session_param = iscsi_session_get_param, |
|
.start_conn = iscsi_conn_start, |
|
.stop_conn = iscsi_sw_tcp_conn_stop, |
|
/* iscsi host params */ |
|
.get_host_param = iscsi_sw_tcp_host_get_param, |
|
.set_host_param = iscsi_host_set_param, |
|
/* IO */ |
|
.send_pdu = iscsi_conn_send_pdu, |
|
.get_stats = iscsi_sw_tcp_conn_get_stats, |
|
/* iscsi task/cmd helpers */ |
|
.init_task = iscsi_tcp_task_init, |
|
.xmit_task = iscsi_tcp_task_xmit, |
|
.cleanup_task = iscsi_tcp_cleanup_task, |
|
/* low level pdu helpers */ |
|
.xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
|
.init_pdu = iscsi_sw_tcp_pdu_init, |
|
.alloc_pdu = iscsi_sw_tcp_pdu_alloc, |
|
/* recovery */ |
|
.session_recovery_timedout = iscsi_session_recovery_timedout, |
|
}; |
|
|
|
static int __init iscsi_sw_tcp_init(void) |
|
{ |
|
if (iscsi_max_lun < 1) { |
|
printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
|
iscsi_max_lun); |
|
return -EINVAL; |
|
} |
|
|
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iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
|
&iscsi_sw_tcp_transport); |
|
if (!iscsi_sw_tcp_scsi_transport) |
|
return -ENODEV; |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit iscsi_sw_tcp_exit(void) |
|
{ |
|
iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
|
} |
|
|
|
module_init(iscsi_sw_tcp_init); |
|
module_exit(iscsi_sw_tcp_exit);
|
|
|