| /* |
| * iSCSI Initiator over TCP/IP Data-Path |
| * |
| * Copyright (C) 2004 Dmitry Yusupov |
| * Copyright (C) 2004 Alex Aizman |
| * Copyright (C) 2005 - 2006 Mike Christie |
| * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| * maintained by open-iscsi@googlegroups.com |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published |
| * by the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * See the file COPYING included with this distribution for more details. |
| * |
| * Credits: |
| * Christoph Hellwig |
| * FUJITA Tomonori |
| * Arne Redlich |
| * Zhenyu Wang |
| */ |
| |
| #include <crypto/hash.h> |
| #include <linux/types.h> |
| #include <linux/inet.h> |
| #include <linux/slab.h> |
| #include <linux/sched/mm.h> |
| #include <linux/file.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <linux/kfifo.h> |
| #include <linux/scatterlist.h> |
| #include <linux/module.h> |
| #include <net/tcp.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_transport_iscsi.h> |
| |
| #include "iscsi_tcp.h" |
| |
| MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
| "Dmitry Yusupov <dmitry_yus@yahoo.com>, " |
| "Alex Aizman <itn780@yahoo.com>"); |
| MODULE_DESCRIPTION("iSCSI/TCP data-path"); |
| MODULE_LICENSE("GPL"); |
| |
| static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
| static struct scsi_host_template iscsi_sw_tcp_sht; |
| static struct iscsi_transport iscsi_sw_tcp_transport; |
| |
| static unsigned int iscsi_max_lun = ~0; |
| module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
| |
| static int iscsi_sw_tcp_dbg; |
| module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, |
| S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " |
| "Set to 1 to turn on, and zero to turn off. Default is off."); |
| |
| #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ |
| do { \ |
| if (iscsi_sw_tcp_dbg) \ |
| iscsi_conn_printk(KERN_INFO, _conn, \ |
| "%s " dbg_fmt, \ |
| __func__, ##arg); \ |
| } while (0); |
| |
| |
| /** |
| * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
| * @rd_desc: read descriptor |
| * @skb: socket buffer |
| * @offset: offset in skb |
| * @len: skb->len - offset |
| */ |
| static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
| unsigned int offset, size_t len) |
| { |
| struct iscsi_conn *conn = rd_desc->arg.data; |
| unsigned int consumed, total_consumed = 0; |
| int status; |
| |
| ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
| |
| do { |
| status = 0; |
| consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); |
| offset += consumed; |
| total_consumed += consumed; |
| } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); |
| |
| ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
| skb->len - offset, status); |
| return total_consumed; |
| } |
| |
| /** |
| * iscsi_sw_sk_state_check - check socket state |
| * @sk: socket |
| * |
| * If the socket is in CLOSE or CLOSE_WAIT we should |
| * not close the connection if there is still some |
| * data pending. |
| * |
| * Must be called with sk_callback_lock. |
| */ |
| static inline int iscsi_sw_sk_state_check(struct sock *sk) |
| { |
| struct iscsi_conn *conn = sk->sk_user_data; |
| |
| if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
| (conn->session->state != ISCSI_STATE_LOGGING_OUT) && |
| !atomic_read(&sk->sk_rmem_alloc)) { |
| ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); |
| iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); |
| return -ECONNRESET; |
| } |
| return 0; |
| } |
| |
| static void iscsi_sw_tcp_data_ready(struct sock *sk) |
| { |
| struct iscsi_conn *conn; |
| struct iscsi_tcp_conn *tcp_conn; |
| read_descriptor_t rd_desc; |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| conn = sk->sk_user_data; |
| if (!conn) { |
| read_unlock_bh(&sk->sk_callback_lock); |
| return; |
| } |
| tcp_conn = conn->dd_data; |
| |
| /* |
| * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
| * We set count to 1 because we want the network layer to |
| * hand us all the skbs that are available. iscsi_tcp_recv |
| * handled pdus that cross buffers or pdus that still need data. |
| */ |
| rd_desc.arg.data = conn; |
| rd_desc.count = 1; |
| tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
| |
| iscsi_sw_sk_state_check(sk); |
| |
| /* If we had to (atomically) map a highmem page, |
| * unmap it now. */ |
| iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
| read_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void iscsi_sw_tcp_state_change(struct sock *sk) |
| { |
| struct iscsi_tcp_conn *tcp_conn; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn; |
| struct iscsi_conn *conn; |
| void (*old_state_change)(struct sock *); |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| conn = sk->sk_user_data; |
| if (!conn) { |
| read_unlock_bh(&sk->sk_callback_lock); |
| return; |
| } |
| |
| iscsi_sw_sk_state_check(sk); |
| |
| tcp_conn = conn->dd_data; |
| tcp_sw_conn = tcp_conn->dd_data; |
| old_state_change = tcp_sw_conn->old_state_change; |
| |
| read_unlock_bh(&sk->sk_callback_lock); |
| |
| old_state_change(sk); |
| } |
| |
| /** |
| * iscsi_write_space - Called when more output buffer space is available |
| * @sk: socket space is available for |
| **/ |
| static void iscsi_sw_tcp_write_space(struct sock *sk) |
| { |
| struct iscsi_conn *conn; |
| struct iscsi_tcp_conn *tcp_conn; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn; |
| void (*old_write_space)(struct sock *); |
| |
| read_lock_bh(&sk->sk_callback_lock); |
| conn = sk->sk_user_data; |
| if (!conn) { |
| read_unlock_bh(&sk->sk_callback_lock); |
| return; |
| } |
| |
| tcp_conn = conn->dd_data; |
| tcp_sw_conn = tcp_conn->dd_data; |
| old_write_space = tcp_sw_conn->old_write_space; |
| read_unlock_bh(&sk->sk_callback_lock); |
| |
| old_write_space(sk); |
| |
| ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
| iscsi_conn_queue_work(conn); |
| } |
| |
| static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
| struct sock *sk = tcp_sw_conn->sock->sk; |
| |
| /* assign new callbacks */ |
| write_lock_bh(&sk->sk_callback_lock); |
| sk->sk_user_data = conn; |
| tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
| tcp_sw_conn->old_state_change = sk->sk_state_change; |
| tcp_sw_conn->old_write_space = sk->sk_write_space; |
| sk->sk_data_ready = iscsi_sw_tcp_data_ready; |
| sk->sk_state_change = iscsi_sw_tcp_state_change; |
| sk->sk_write_space = iscsi_sw_tcp_write_space; |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static void |
| iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
| struct sock *sk = tcp_sw_conn->sock->sk; |
| |
| /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ |
| write_lock_bh(&sk->sk_callback_lock); |
| sk->sk_user_data = NULL; |
| sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
| sk->sk_state_change = tcp_sw_conn->old_state_change; |
| sk->sk_write_space = tcp_sw_conn->old_write_space; |
| sk->sk_no_check_tx = 0; |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| /** |
| * iscsi_sw_tcp_xmit_segment - transmit segment |
| * @tcp_conn: the iSCSI TCP connection |
| * @segment: the buffer to transmnit |
| * |
| * This function transmits as much of the buffer as |
| * the network layer will accept, and returns the number of |
| * bytes transmitted. |
| * |
| * If CRC hashing is enabled, the function will compute the |
| * hash as it goes. When the entire segment has been transmitted, |
| * it will retrieve the hash value and send it as well. |
| */ |
| static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
| struct iscsi_segment *segment) |
| { |
| struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
| struct socket *sk = tcp_sw_conn->sock; |
| unsigned int copied = 0; |
| int r = 0; |
| |
| while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
| struct scatterlist *sg; |
| unsigned int offset, copy; |
| int flags = 0; |
| |
| r = 0; |
| offset = segment->copied; |
| copy = segment->size - offset; |
| |
| if (segment->total_copied + segment->size < segment->total_size) |
| flags |= MSG_MORE; |
| |
| /* Use sendpage if we can; else fall back to sendmsg */ |
| if (!segment->data) { |
| sg = segment->sg; |
| offset += segment->sg_offset + sg->offset; |
| r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, |
| copy, flags); |
| } else { |
| struct msghdr msg = { .msg_flags = flags }; |
| struct kvec iov = { |
| .iov_base = segment->data + offset, |
| .iov_len = copy |
| }; |
| |
| r = kernel_sendmsg(sk, &msg, &iov, 1, copy); |
| } |
| |
| if (r < 0) { |
| iscsi_tcp_segment_unmap(segment); |
| return r; |
| } |
| copied += r; |
| } |
| return copied; |
| } |
| |
| /** |
| * iscsi_sw_tcp_xmit - TCP transmit |
| * @conn: iscsi connection |
| **/ |
| static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
| struct iscsi_segment *segment = &tcp_sw_conn->out.segment; |
| unsigned int consumed = 0; |
| int rc = 0; |
| |
| while (1) { |
| rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
| /* |
| * We may not have been able to send data because the conn |
| * is getting stopped. libiscsi will know so propagate err |
| * for it to do the right thing. |
| */ |
| if (rc == -EAGAIN) |
| return rc; |
| else if (rc < 0) { |
| rc = ISCSI_ERR_XMIT_FAILED; |
| goto error; |
| } else if (rc == 0) |
| break; |
| |
| consumed += rc; |
| |
| if (segment->total_copied >= segment->total_size) { |
| if (segment->done != NULL) { |
| rc = segment->done(tcp_conn, segment); |
| if (rc != 0) |
| goto error; |
| } |
| } |
| } |
| |
| ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
| |
| conn->txdata_octets += consumed; |
| return consumed; |
| |
| error: |
| /* Transmit error. We could initiate error recovery |
| * here. */ |
| ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
| iscsi_conn_failure(conn, rc); |
| return -EIO; |
| } |
| |
| /** |
| * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
| * @conn: iscsi connection |
| */ |
| static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
| { |
| struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
| struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
| struct iscsi_segment *segment = &tcp_sw_conn->out.segment; |
| |
| return segment->total_copied - segment->total_size; |
| } |
| |
| static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
| { |
| struct iscsi_conn *conn = task->conn; |
| unsigned int noreclaim_flag; |
| int rc = 0; |
| |
| 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; |
| } |
| |
| 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 = scsi_out(task->sc); |
| |
| 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; |
| |
| 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); |
| |
| 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; |
| int rc, len; |
| |
| 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; |
| } |
| if (param == ISCSI_PARAM_LOCAL_PORT) |
| rc = kernel_getsockname(tcp_sw_conn->sock, |
| (struct sockaddr *)&addr, &len); |
| else |
| rc = kernel_getpeername(tcp_sw_conn->sock, |
| (struct sockaddr *)&addr, &len); |
| spin_unlock_bh(&conn->session->frwd_lock); |
| if (rc) |
| 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; |
| int rc, len; |
| |
| 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; |
| if (!tcp_sw_conn->sock) { |
| spin_unlock_bh(&session->frwd_lock); |
| return -ENOTCONN; |
| } |
| |
| rc = kernel_getsockname(tcp_sw_conn->sock, |
| (struct sockaddr *)&addr, &len); |
| spin_unlock_bh(&session->frwd_lock); |
| if (rc) |
| return rc; |
| |
| return iscsi_conn_get_addr_param((struct sockaddr_storage *) |
| &addr, 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; |
| |
| 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; |
| |
| 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; |
| |
| shost->can_queue = session->scsi_cmds_max; |
| 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); |
| |
| 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_alloc(struct scsi_device *sdev) |
| { |
| set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); |
| return 0; |
| } |
| |
| static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
| { |
| blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
| 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_DEF_XMIT_CMDS_MAX - 1, |
| .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, |
| .use_clustering = DISABLE_CLUSTERING, |
| .slave_alloc = iscsi_sw_tcp_slave_alloc, |
| .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; |
| } |
| |
| 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); |