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004d6530f8
at libiscsi generic code
- currently code assumes a storage space of pdu header is allocated
at llds ctask and is pointed to by iscsi_cmd_task->hdr. Here I add
a hdr_max field pertaining to that storage, and an hdr_len that
accumulates the current use of the pdu-header.
- Add an iscsi_next_hdr() inline which returns the next free space
to write new Header at. Also iscsi_next_hdr() is used to retrieve
the address at which to write the header-digest.
- Add iscsi_add_hdr(length). What the user do is calls iscsi_next_hdr()
for address of the new header, than calls iscsi_add_hdr(length) with
the size of the new header. iscsi_add_hdr() will check if space is
available and update to the new size. length must be padded according
to standard.
- Add 2 padding inline helpers thanks to Olaf. Current patch does not
use them but Following patches will.
Also moved definition of ISCSI_PAD_LEN to iscsi_proto.h which had
PAD_WORD_LEN that was never used anywhere.
- Let iscsi_prep_scsi_cmd_pdu() signal an Error return since now it is
possible that it will fail.
- I was tired of yet again writing a "this is a digest" comment next to
sizeof(__u32) so I defined a new ISCSI_DIGEST_SIZE. Now I don't need
any comments. Changed all places that used sizeof(__u32) or "4" in
connection to a digest.
iscsi_tcp specific code
- At struct iscsi_tcp_cmd_task allocate maximum space allowed in
standard for all headers following the iscsi_cmd header. and mark
it so in iscsi_tcp_session_create()
- At iscsi_send_cmd_hdr() retrieve the correct headers size and
write header digest at iscsi_next_hdr().
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
/*
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* iSCSI Initiator TCP Transport
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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 open-iscsi@googlegroups.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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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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#ifndef ISCSI_TCP_H
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#define ISCSI_TCP_H
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#include <scsi/libiscsi.h>
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/* xmit state machine */
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#define XMSTATE_IDLE 0x0
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#define XMSTATE_CMD_HDR_INIT 0x1
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#define XMSTATE_CMD_HDR_XMIT 0x2
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#define XMSTATE_IMM_HDR 0x4
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#define XMSTATE_IMM_DATA 0x8
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#define XMSTATE_UNS_INIT 0x10
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#define XMSTATE_UNS_HDR 0x20
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#define XMSTATE_UNS_DATA 0x40
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#define XMSTATE_SOL_HDR 0x80
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#define XMSTATE_SOL_DATA 0x100
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#define XMSTATE_W_PAD 0x200
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#define XMSTATE_W_RESEND_PAD 0x400
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#define XMSTATE_W_RESEND_DATA_DIGEST 0x800
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#define XMSTATE_IMM_HDR_INIT 0x1000
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#define XMSTATE_SOL_HDR_INIT 0x2000
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#define ISCSI_SG_TABLESIZE SG_ALL
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#define ISCSI_TCP_MAX_CMD_LEN 16
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struct crypto_hash;
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struct socket;
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struct iscsi_tcp_conn;
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struct iscsi_chunk;
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typedef int iscsi_chunk_done_fn_t(struct iscsi_tcp_conn *,
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struct iscsi_chunk *);
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struct iscsi_chunk {
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unsigned char *data;
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unsigned int size;
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unsigned int copied;
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unsigned int total_size;
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unsigned int total_copied;
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struct hash_desc *hash;
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unsigned char recv_digest[ISCSI_DIGEST_SIZE];
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unsigned char digest[ISCSI_DIGEST_SIZE];
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unsigned int digest_len;
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struct scatterlist *sg;
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void *sg_mapped;
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unsigned int sg_offset;
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unsigned int sg_index;
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unsigned int sg_count;
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iscsi_chunk_done_fn_t *done;
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};
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/* Socket connection recieve helper */
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struct iscsi_tcp_recv {
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struct iscsi_hdr *hdr;
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struct iscsi_chunk chunk;
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/* Allocate buffer for BHS + AHS */
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uint32_t hdr_buf[64];
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/* copied and flipped values */
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int datalen;
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};
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/* Socket connection send helper */
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struct iscsi_tcp_send {
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struct iscsi_hdr *hdr;
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struct iscsi_chunk chunk;
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struct iscsi_chunk data_chunk;
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/* Allocate buffer for BHS + AHS */
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uint32_t hdr_buf[64];
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};
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struct iscsi_tcp_conn {
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struct iscsi_conn *iscsi_conn;
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struct socket *sock;
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int stop_stage; /* conn_stop() flag: *
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* stop to recover, *
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* stop to terminate */
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/* control data */
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struct iscsi_tcp_recv in; /* TCP receive context */
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struct iscsi_tcp_send out; /* TCP send context */
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/* old values for socket callbacks */
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void (*old_data_ready)(struct sock *, int);
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void (*old_state_change)(struct sock *);
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void (*old_write_space)(struct sock *);
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/* data and header digests */
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struct hash_desc tx_hash; /* CRC32C (Tx) */
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struct hash_desc rx_hash; /* CRC32C (Rx) */
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/* MIB custom statistics */
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uint32_t sendpage_failures_cnt;
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uint32_t discontiguous_hdr_cnt;
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ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
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};
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struct iscsi_buf {
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struct scatterlist sg;
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unsigned int sent;
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char use_sendmsg;
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};
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struct iscsi_data_task {
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struct iscsi_data hdr; /* PDU */
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char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
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struct iscsi_buf digestbuf; /* digest buffer */
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uint32_t digest; /* data digest */
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};
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struct iscsi_tcp_mgmt_task {
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struct iscsi_hdr hdr;
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char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */
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int xmstate; /* mgmt xmit progress */
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struct iscsi_buf headbuf; /* header buffer */
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struct iscsi_buf sendbuf; /* in progress buffer */
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int sent;
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};
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struct iscsi_r2t_info {
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__be32 ttt; /* copied from R2T */
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__be32 exp_statsn; /* copied from R2T */
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uint32_t data_length; /* copied from R2T */
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uint32_t data_offset; /* copied from R2T */
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struct iscsi_buf headbuf; /* Data-Out Header Buffer */
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struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
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int sent; /* R2T sequence progress */
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int data_count; /* DATA-Out payload progress */
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struct scatterlist *sg; /* per-R2T SG list */
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int solicit_datasn;
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struct iscsi_data_task dtask; /* which data task */
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};
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struct iscsi_tcp_cmd_task {
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struct iscsi_hdr_buff {
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struct iscsi_cmd cmd_hdr;
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char hdrextbuf[ISCSI_MAX_AHS_SIZE +
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ISCSI_DIGEST_SIZE];
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} hdr;
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char pad[ISCSI_PAD_LEN];
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int pad_count; /* padded bytes */
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struct iscsi_buf headbuf; /* header buf (xmit) */
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struct iscsi_buf sendbuf; /* in progress buffer*/
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int xmstate; /* xmit xtate machine */
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int sent;
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struct scatterlist *sg; /* per-cmd SG list */
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struct scatterlist *bad_sg; /* assert statement */
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int sg_count; /* SG's to process */
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uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
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int data_offset;
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struct iscsi_r2t_info *r2t; /* in progress R2T */
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struct iscsi_queue r2tpool;
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struct kfifo *r2tqueue;
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struct iscsi_r2t_info **r2ts;
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int digest_count;
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uint32_t immdigest; /* for imm data */
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struct iscsi_buf immbuf; /* for imm data digest */
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struct iscsi_data_task unsol_dtask; /* unsol data task */
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};
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#endif /* ISCSI_H */
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