From a8ac6311cc21d78fa284cd43f56df2063f536bf1 Mon Sep 17 00:00:00 2001 From: Olaf Kirch Date: Thu, 13 Dec 2007 12:43:35 -0600 Subject: [SCSI] iscsi: convert xmit path to iscsi chunks Convert xmit to iscsi chunks. from michaelc@cs.wisc.edu: Bug fixes, more digest integration, sg chaining conversion and other sg wrapper changes, coding style sync up, and removal of io fields, like pdu_sent, that are not needed. Signed-off-by: Olaf Kirch Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/iscsi_tcp.h | 75 ++++++++++-------------------------------------- 1 file changed, 15 insertions(+), 60 deletions(-) (limited to 'drivers/scsi/iscsi_tcp.h') diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index d49d87611e8..893cd2e1701 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -24,35 +24,18 @@ #include -/* xmit state machine */ -#define XMSTATE_IDLE 0x0 -#define XMSTATE_CMD_HDR_INIT 0x1 -#define XMSTATE_CMD_HDR_XMIT 0x2 -#define XMSTATE_IMM_HDR 0x4 -#define XMSTATE_IMM_DATA 0x8 -#define XMSTATE_UNS_INIT 0x10 -#define XMSTATE_UNS_HDR 0x20 -#define XMSTATE_UNS_DATA 0x40 -#define XMSTATE_SOL_HDR 0x80 -#define XMSTATE_SOL_DATA 0x100 -#define XMSTATE_W_PAD 0x200 -#define XMSTATE_W_RESEND_PAD 0x400 -#define XMSTATE_W_RESEND_DATA_DIGEST 0x800 -#define XMSTATE_IMM_HDR_INIT 0x1000 -#define XMSTATE_SOL_HDR_INIT 0x2000 - #define ISCSI_SG_TABLESIZE SG_ALL #define ISCSI_TCP_MAX_CMD_LEN 16 struct crypto_hash; struct socket; struct iscsi_tcp_conn; -struct iscsi_chunk; +struct iscsi_segment; -typedef int iscsi_chunk_done_fn_t(struct iscsi_tcp_conn *, - struct iscsi_chunk *); +typedef int iscsi_segment_done_fn_t(struct iscsi_tcp_conn *, + struct iscsi_segment *); -struct iscsi_chunk { +struct iscsi_segment { unsigned char *data; unsigned int size; unsigned int copied; @@ -67,16 +50,14 @@ struct iscsi_chunk { struct scatterlist *sg; void *sg_mapped; unsigned int sg_offset; - unsigned int sg_index; - unsigned int sg_count; - iscsi_chunk_done_fn_t *done; + iscsi_segment_done_fn_t *done; }; /* Socket connection recieve helper */ struct iscsi_tcp_recv { struct iscsi_hdr *hdr; - struct iscsi_chunk chunk; + struct iscsi_segment segment; /* Allocate buffer for BHS + AHS */ uint32_t hdr_buf[64]; @@ -88,11 +69,8 @@ struct iscsi_tcp_recv { /* 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_segment segment; + struct iscsi_segment data_segment; }; struct iscsi_tcp_conn { @@ -118,29 +96,19 @@ struct iscsi_tcp_conn { 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[ISCSI_DIGEST_SIZE];/* Header-Digest */ - struct iscsi_buf digestbuf; /* digest buffer */ - uint32_t digest; /* data digest */ }; struct iscsi_tcp_mgmt_task { struct iscsi_hdr hdr; char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */ - int xmstate; /* mgmt xmit progress */ - struct iscsi_buf headbuf; /* header buffer */ - struct iscsi_buf sendbuf; /* in progress buffer */ - int sent; }; struct iscsi_r2t_info { @@ -148,13 +116,10 @@ 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 { @@ -163,24 +128,14 @@ struct iscsi_tcp_cmd_task { char hdrextbuf[ISCSI_MAX_AHS_SIZE + ISCSI_DIGEST_SIZE]; } hdr; - char pad[ISCSI_PAD_LEN]; - int pad_count; /* padded bytes */ - struct iscsi_buf headbuf; /* header buf (xmit) */ - struct iscsi_buf sendbuf; /* in progress buffer*/ - int xmstate; /* xmit xtate machine */ + 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_r2t_info *r2t; /* in progress R2T */ struct iscsi_pool r2tpool; struct kfifo *r2tqueue; - 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 */ -- cgit v1.2.3