#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_VALUE_IDLE 0
-#define XMSTATE_BIT_CMD_HDR_INIT 0
-#define XMSTATE_BIT_CMD_HDR_XMIT 1
-#define XMSTATE_BIT_IMM_HDR 2
-#define XMSTATE_BIT_IMM_DATA 3
-#define XMSTATE_BIT_UNS_INIT 4
-#define XMSTATE_BIT_UNS_HDR 5
-#define XMSTATE_BIT_UNS_DATA 6
-#define XMSTATE_BIT_SOL_HDR 7
-#define XMSTATE_BIT_SOL_DATA 8
-#define XMSTATE_BIT_W_PAD 9
-#define XMSTATE_BIT_W_RESEND_PAD 10
-#define XMSTATE_BIT_W_RESEND_DATA_DIGEST 11
-#define XMSTATE_BIT_IMM_HDR_INIT 12
-#define XMSTATE_BIT_SOL_HDR_INIT 13
-
-#define ISCSI_PAD_LEN 4
-#define ISCSI_SG_TABLESIZE SG_ALL
-#define ISCSI_TCP_MAX_CMD_LEN 16
-
struct crypto_hash;
struct socket;
+struct iscsi_tcp_conn;
+struct iscsi_segment;
+
+typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *,
+ struct iscsi_segment *);
+
+struct iscsi_segment {
+ 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;
+
+ iscsi_segment_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_segment segment;
+
+ /* 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_segment segment;
+ struct iscsi_segment data_segment;
};
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);
uint32_t sendpage_failures_cnt;
uint32_t discontiguous_hdr_cnt;
- ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
-};
+ int error;
-struct iscsi_buf {
- struct scatterlist sg;
- unsigned int sent;
- char use_sendmsg;
+ ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
};
struct iscsi_data_task {
struct iscsi_data hdr; /* PDU */
- char hdrext[sizeof(__u32)]; /* Header-Digest */
- struct iscsi_buf digestbuf; /* digest buffer */
- uint32_t digest; /* data digest */
+ char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
};
struct iscsi_tcp_mgmt_task {
struct iscsi_hdr hdr;
- char hdrext[sizeof(__u32)]; /* Header-Digest */
- unsigned long xmstate; /* mgmt xmit progress */
- struct iscsi_buf headbuf; /* header buffer */
- struct iscsi_buf sendbuf; /* in progress buffer */
- int sent;
+ char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */
};
struct iscsi_r2t_info {
__be32 exp_statsn; /* copied from R2T */
uint32_t data_length; /* copied from R2T */
uint32_t data_offset; /* copied from R2T */
- struct iscsi_buf headbuf; /* Data-Out Header Buffer */
- struct iscsi_buf sendbuf; /* Data-Out in progress buffer*/
int sent; /* R2T sequence progress */
int data_count; /* DATA-Out payload progress */
- struct scatterlist *sg; /* per-R2T SG list */
int solicit_datasn;
- struct iscsi_data_task dtask; /* which data task */
+ struct iscsi_data_task dtask; /* Data-Out header buf */
};
struct iscsi_tcp_cmd_task {
- struct iscsi_cmd hdr;
- char hdrext[4*sizeof(__u16)+ /* AHS */
- sizeof(__u32)]; /* HeaderDigest */
- char pad[ISCSI_PAD_LEN];
- int pad_count; /* padded bytes */
- struct iscsi_buf headbuf; /* header buf (xmit) */
- struct iscsi_buf sendbuf; /* in progress buffer*/
- unsigned long xmstate; /* xmit xtate machine */
+ struct iscsi_hdr_buff {
+ struct iscsi_cmd cmd_hdr;
+ char hdrextbuf[ISCSI_MAX_AHS_SIZE +
+ ISCSI_DIGEST_SIZE];
+ } hdr;
+
int sent;
- struct scatterlist *sg; /* per-cmd SG list */
- struct scatterlist *bad_sg; /* assert statement */
- int sg_count; /* SG's to process */
- uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
+ uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
int data_offset;
- struct iscsi_r2t_info *r2t; /* in progress R2T */
- struct iscsi_queue r2tpool;
+ struct iscsi_r2t_info *r2t; /* in progress R2T */
+ struct iscsi_pool r2tpool;
struct kfifo *r2tqueue;
- struct iscsi_r2t_info **r2ts;
- int digest_count;
- uint32_t immdigest; /* for imm data */
- struct iscsi_buf immbuf; /* for imm data digest */
- struct iscsi_data_task unsol_dtask; /* unsol data task */
+ struct iscsi_data_task unsol_dtask; /* Data-Out header buf */
};
#endif /* ISCSI_H */
projects / linux-flexiantxendom0-3.2.10.git / blobdiff