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[SCSI] iscsi_tcp: rewrite recv path

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Rewrite recv path. Fixes:
- data digest processing and error handling.
- ahs support.

Some fixups by Mike Christie

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>
This commit is contained in:
Olaf Kirch 2007-12-13 12:43:21 -06:00 committed by James Bottomley
parent 843c0a8a76
commit da32dd681f
3 changed files with 556 additions and 540 deletions
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1026
drivers/scsi/iscsi_tcp.c
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File diff suppressed because it is too large Load Diff

66
drivers/scsi/iscsi_tcp.h
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@ -24,13 +24,6 @@
#include <scsi/libiscsi.h>
/* Socket's Receive state machine */
#define IN_PROGRESS_WAIT_HEADER 0x0
#define IN_PROGRESS_HEADER_GATHER 0x1
#define IN_PROGRESS_DATA_RECV 0x2
#define IN_PROGRESS_DDIGEST_RECV 0x3
#define IN_PROGRESS_PAD_RECV 0x4
/* xmit state machine */
#define XMSTATE_IDLE 0x0
#define XMSTATE_CMD_HDR_INIT 0x1
@ -54,41 +47,64 @@
struct crypto_hash;
struct socket;
struct iscsi_tcp_conn;
struct iscsi_chunk;
typedef int iscsi_chunk_done_fn_t(struct iscsi_tcp_conn *,
struct iscsi_chunk *);
struct iscsi_chunk {
unsigned char *data;
unsigned int size;
unsigned int copied;
unsigned int total_size;
unsigned int total_copied;
struct hash_desc *hash;
unsigned char recv_digest[ISCSI_DIGEST_SIZE];
unsigned char digest[ISCSI_DIGEST_SIZE];
unsigned int digest_len;
struct scatterlist *sg;
void *sg_mapped;
unsigned int sg_offset;
unsigned int sg_index;
unsigned int sg_count;
iscsi_chunk_done_fn_t *done;
};
/* Socket connection recieve helper */
struct iscsi_tcp_recv {
struct iscsi_hdr *hdr;
struct sk_buff *skb;
int offset;
int len;
int hdr_offset;
int copy;
int copied;
int padding;
struct iscsi_cmd_task *ctask; /* current cmd in progress */
struct iscsi_chunk chunk;
/* Allocate buffer for BHS + AHS */
uint32_t hdr_buf[64];
/* copied and flipped values */
int datalen;
int datadgst;
char zero_copy_hdr;
};
/* Socket connection send helper */
struct iscsi_tcp_send {
struct iscsi_hdr *hdr;
struct iscsi_chunk chunk;
struct iscsi_chunk data_chunk;
/* Allocate buffer for BHS + AHS */
uint32_t hdr_buf[64];
};
struct iscsi_tcp_conn {
struct iscsi_conn *iscsi_conn;
struct socket *sock;
struct iscsi_hdr hdr; /* header placeholder */
char hdrext[4*sizeof(__u16) +
sizeof(__u32)];
int data_copied;
int stop_stage; /* conn_stop() flag: *
* stop to recover, *
* stop to terminate */
/* iSCSI connection-wide sequencing */
int hdr_size; /* PDU header size */
/* control data */
struct iscsi_tcp_recv in; /* TCP receive context */
int in_progress; /* connection state machine */
struct iscsi_tcp_send out; /* TCP send context */
/* old values for socket callbacks */
void (*old_data_ready)(struct sock *, int);

4
include/scsi/libiscsi.h
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@ -77,6 +77,10 @@ enum {
#define ISCSI_ADDRESS_BUF_LEN 64
enum {
ISCSI_DIGEST_SIZE = sizeof(__u32),
};
struct iscsi_mgmt_task {
/*
* Becuae LLDs allocate their hdr differently, this is a pointer to