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[SCSI] iscsi: preemt fix and cleanup 

From: zhenyu.z.wang@intel.com

Delay the head digest update until xmit time, like data digest update.
[To make things cleaner and avoid prempt bug]

Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2005-09-12 21:01:32 -05:00 committed by James Bottomley
parent b13941f635
commit af973481f4
1 changed files with 28 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/scsi/iscsi_tcp.c
View File

@ -129,14 +129,11 @@ iscsi_buf_left(struct iscsi_buf *ibuf)
}
static inline void
iscsi_buf_init_hdr(struct iscsi_conn *conn, struct iscsi_buf *ibuf,
char *vbuf, u8 *crc)
iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
u8* crc)
{
iscsi_buf_init_virt(ibuf, vbuf, sizeof(struct iscsi_hdr));
if (conn->hdrdgst_en) {
crypto_digest_digest(conn->tx_tfm, &ibuf->sg, 1, crc);
ibuf->sg.length += sizeof(uint32_t);
}
crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
buf->sg.length += sizeof(uint32_t);
}
static void
@ -427,8 +424,8 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
r2t->sent = 0;
iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
(u8 *)dtask->hdrext);
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
r2t->dtask = dtask;
@ -1494,8 +1491,8 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
}
conn->dataout_pdus_cnt++;
iscsi_buf_init_hdr(conn, &r2t->headbuf, (char*)hdr,
(u8 *)dtask->hdrext);
iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
r2t->dtask = dtask;
@ -1541,8 +1538,8 @@ iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
hdr->flags = ISCSI_FLAG_CMD_FINAL;
}
iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)hdr,
(u8 *)dtask->hdrext);
iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
list_add(&dtask->item, &ctask->dataqueue);
@ -1662,8 +1659,8 @@ iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
zero_data(ctask->hdr.dlength);
}
iscsi_buf_init_hdr(conn, &ctask->headbuf, (char*)&ctask->hdr,
(u8 *)ctask->hdrext);
iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
sizeof(struct iscsi_hdr));
conn->scsicmd_pdus_cnt++;
}
@ -1692,6 +1689,11 @@ iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
mtask->xmstate &= ~XMSTATE_IMM_HDR;
if (mtask->data_count)
mtask->xmstate |= XMSTATE_IMM_DATA;
if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
conn->stop_stage != STOP_CONN_RECOVER &&
conn->hdrdgst_en)
iscsi_hdr_digest(conn, &mtask->headbuf,
(u8*)mtask->hdrext);
if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
mtask->xmstate |= XMSTATE_IMM_HDR;
if (mtask->data_count)
@ -1723,6 +1725,8 @@ static inline int
handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
ctask->xmstate &= ~XMSTATE_R_HDR;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
BUG_ON(ctask->xmstate != XMSTATE_IDLE);
return 0; /* wait for Data-In */
@ -1735,6 +1739,8 @@ static inline int
handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
ctask->xmstate &= ~XMSTATE_W_HDR;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
ctask->xmstate |= XMSTATE_W_HDR;
return -EAGAIN;
@ -1813,7 +1819,9 @@ handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
iscsi_unsolicit_data_init(conn, ctask);
BUG_ON(!ctask->dtask);
dtask = ctask->dtask;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &ctask->headbuf,
(u8*)dtask->hdrext);
ctask->xmstate &= ~XMSTATE_UNS_INIT;
}
if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
@ -2118,7 +2126,9 @@ unsolicit_head_again:
sizeof(void*));
solicit_head_again:
r2t = ctask->r2t;
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &r2t->headbuf,
(u8*)r2t->dtask->hdrext);
if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
ctask->xmstate &= ~XMSTATE_SOL_DATA;
ctask->xmstate |= XMSTATE_SOL_HDR;
@ -2889,14 +2899,8 @@ iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE ||
conn->stop_stage == STOP_CONN_RECOVER)
iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
sizeof(struct iscsi_hdr));
else
/* this will update header digest */
iscsi_buf_init_hdr(conn, &mtask->headbuf, (char*)&mtask->hdr,
(u8 *)mtask->hdrext);
spin_unlock_bh(&session->lock);