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[SCSI] iscsi_tcp: convert to use the data buffer accessors 

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

TODO: use scsi_for_each_sg().

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
hifive-unleashed-5.1
FUJITA Tomonori 2007-06-14 22:13:17 +09:00 committed by James Bottomley
parent d36b113eea
commit 1c13899154
2 changed files with 47 additions and 88 deletions
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115
drivers/scsi/iscsi_tcp.c
View File

@ -237,10 +237,10 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
tcp_ctask->exp_datasn++;
tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
if (tcp_ctask->data_offset + tcp_conn->in.datalen > sc->request_bufflen) {
if (tcp_ctask->data_offset + tcp_conn->in.datalen > scsi_bufflen(sc)) {
debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
__FUNCTION__, tcp_ctask->data_offset,
tcp_conn->in.datalen, sc->request_bufflen);
tcp_conn->in.datalen, scsi_bufflen(sc));
return ISCSI_ERR_DATA_OFFSET;
}
@ -250,14 +250,14 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
int res_count = be32_to_cpu(rhdr->residual_count);
if (res_count > 0 &&
res_count <= sc->request_bufflen) {
sc->resid = res_count;
res_count <= scsi_bufflen(sc)) {
scsi_set_resid(sc, res_count);
sc->result = (DID_OK << 16) | rhdr->cmd_status;
} else
sc->result = (DID_BAD_TARGET << 16) |
rhdr->cmd_status;
} else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
sc->resid = be32_to_cpu(rhdr->residual_count);
scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
sc->result = (DID_OK << 16) | rhdr->cmd_status;
} else
sc->result = (DID_OK << 16) | rhdr->cmd_status;
@ -285,6 +285,8 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
{
struct iscsi_data *hdr;
struct scsi_cmnd *sc = ctask->sc;
int i, sg_count = 0;
struct scatterlist *sg;
hdr = &r2t->dtask.hdr;
memset(hdr, 0, sizeof(struct iscsi_data));
@ -312,39 +314,30 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
iscsi_buf_init_iov(&r2t->headbuf, (char*)hdr,
sizeof(struct iscsi_hdr));
if (sc->use_sg) {
int i, sg_count = 0;
struct scatterlist *sg = sc->request_buffer;
sg = scsi_sglist(sc);
r2t->sg = NULL;
for (i = 0; i < scsi_sg_count(sc); i++, sg += 1) {
/* FIXME: prefetch ? */
if (sg_count + sg->length > r2t->data_offset) {
int page_offset;
r2t->sg = NULL;
for (i = 0; i < sc->use_sg; i++, sg += 1) {
/* FIXME: prefetch ? */
if (sg_count + sg->length > r2t->data_offset) {
int page_offset;
/* sg page found! */
/* sg page found! */
/* offset within this page */
page_offset = r2t->data_offset - sg_count;
/* offset within this page */
page_offset = r2t->data_offset - sg_count;
/* fill in this buffer */
iscsi_buf_init_sg(&r2t->sendbuf, sg);
r2t->sendbuf.sg.offset += page_offset;
r2t->sendbuf.sg.length -= page_offset;
/* fill in this buffer */
iscsi_buf_init_sg(&r2t->sendbuf, sg);
r2t->sendbuf.sg.offset += page_offset;
r2t->sendbuf.sg.length -= page_offset;
/* xmit logic will continue with next one */
r2t->sg = sg + 1;
break;
}
sg_count += sg->length;
/* xmit logic will continue with next one */
r2t->sg = sg + 1;
break;
}
BUG_ON(r2t->sg == NULL);
} else {
iscsi_buf_init_iov(&r2t->sendbuf,
(char*)sc->request_buffer + r2t->data_offset,
r2t->data_count);
r2t->sg = NULL;
sg_count += sg->length;
}
BUG_ON(r2t->sg == NULL);
}
/**
@ -404,11 +397,11 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
r2t->data_length, session->max_burst);
r2t->data_offset = be32_to_cpu(rhdr->data_offset);
if (r2t->data_offset + r2t->data_length > ctask->sc->request_bufflen) {
if (r2t->data_offset + r2t->data_length > scsi_bufflen(ctask->sc)) {
spin_unlock(&session->lock);
printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
"offset %u and total length %d\n", r2t->data_length,
r2t->data_offset, ctask->sc->request_bufflen);
r2t->data_offset, scsi_bufflen(ctask->sc));
return ISCSI_ERR_DATALEN;
}
@ -612,7 +605,7 @@ iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
size, tcp_conn->in.offset, tcp_conn->in.copied);
BUG_ON(size <= 0);
BUG_ON(tcp_ctask->sent + size > ctask->sc->request_bufflen);
BUG_ON(tcp_ctask->sent + size > scsi_bufflen(ctask->sc));
rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
(char*)buf + (offset + tcp_conn->data_copied), size);
@ -710,25 +703,8 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
BUG_ON((void*)ctask != sc->SCp.ptr);
/*
* copying Data-In into the Scsi_Cmnd
*/
if (!sc->use_sg) {
i = ctask->data_count;
rc = iscsi_ctask_copy(tcp_conn, ctask, sc->request_buffer,
sc->request_bufflen,
tcp_ctask->data_offset);
if (rc == -EAGAIN)
return rc;
if (conn->datadgst_en)
iscsi_recv_digest_update(tcp_conn, sc->request_buffer,
i);
rc = 0;
goto done;
}
offset = tcp_ctask->data_offset;
sg = sc->request_buffer;
sg = scsi_sglist(sc);
if (tcp_ctask->data_offset)
for (i = 0; i < tcp_ctask->sg_count; i++)
@ -737,7 +713,7 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
if (offset < 0)
offset = 0;
for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
for (i = tcp_ctask->sg_count; i < scsi_sg_count(sc); i++) {
char *dest;
dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
@ -782,7 +758,6 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
}
BUG_ON(ctask->data_count);
done:
/* check for non-exceptional status */
if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
@ -1241,7 +1216,6 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
struct iscsi_r2t_info *r2t, int left)
{
struct iscsi_data *hdr;
struct scsi_cmnd *sc = ctask->sc;
int new_offset;
hdr = &r2t->dtask.hdr;
@ -1271,15 +1245,8 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
if (iscsi_buf_left(&r2t->sendbuf))
return;
if (sc->use_sg) {
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
r2t->sg += 1;
} else {
iscsi_buf_init_iov(&r2t->sendbuf,
(char*)sc->request_buffer + new_offset,
r2t->data_count);
r2t->sg = NULL;
}
iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
r2t->sg += 1;
}
static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
@ -1408,23 +1375,15 @@ iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
tcp_ctask->exp_datasn = 0;
if (sc->sc_data_direction == DMA_TO_DEVICE) {
if (sc->use_sg) {
struct scatterlist *sg = sc->request_buffer;
struct scatterlist *sg = scsi_sglist(sc);
iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
tcp_ctask->sg = sg + 1;
tcp_ctask->bad_sg = sg + sc->use_sg;
} else {
iscsi_buf_init_iov(&tcp_ctask->sendbuf,
sc->request_buffer,
sc->request_bufflen);
tcp_ctask->sg = NULL;
tcp_ctask->bad_sg = NULL;
}
iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
tcp_ctask->sg = sg + 1;
tcp_ctask->bad_sg = sg + scsi_sg_count(sc);
debug_scsi("cmd [itt 0x%x total %d imm_data %d "
"unsol count %d, unsol offset %d]\n",
ctask->itt, sc->request_bufflen,
ctask->itt, scsi_bufflen(sc),
ctask->imm_count, ctask->unsol_count,
ctask->unsol_offset);
}

20
drivers/scsi/libiscsi.c
View File

@ -140,7 +140,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
hdr->flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
hdr->itt = build_itt(ctask->itt, conn->id, session->age);
hdr->data_length = cpu_to_be32(sc->request_bufflen);
hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
hdr->cmdsn = cpu_to_be32(session->cmdsn);
session->cmdsn++;
hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
@ -172,11 +172,11 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
ctask->unsol_datasn = 0;
if (session->imm_data_en) {
if (sc->request_bufflen >= session->first_burst)
if (scsi_bufflen(sc) >= session->first_burst)
ctask->imm_count = min(session->first_burst,
conn->max_xmit_dlength);
else
ctask->imm_count = min(sc->request_bufflen,
ctask->imm_count = min(scsi_bufflen(sc),
conn->max_xmit_dlength);
hton24(ctask->hdr->dlength, ctask->imm_count);
} else
@ -184,7 +184,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
if (!session->initial_r2t_en) {
ctask->unsol_count = min((session->first_burst),
(sc->request_bufflen)) - ctask->imm_count;
(scsi_bufflen(sc))) - ctask->imm_count;
ctask->unsol_offset = ctask->imm_count;
}
@ -204,7 +204,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
"cmdsn %d win %d]\n",
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
}
@ -297,14 +297,14 @@ invalid_datalen:
if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
int res_count = be32_to_cpu(rhdr->residual_count);
if (res_count > 0 && res_count <= sc->request_bufflen)
sc->resid = res_count;
if (res_count > 0 && res_count <= scsi_bufflen(sc))
scsi_set_resid(sc, res_count);
else
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
} else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
sc->resid = be32_to_cpu(rhdr->residual_count);
scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
out:
debug_scsi("done [sc %lx res %d itt 0x%x]\n",
@ -876,7 +876,7 @@ fault:
printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
sc->cmnd[0], reason);
sc->result = (DID_NO_CONNECT << 16);
sc->resid = sc->request_bufflen;
scsi_set_resid(sc, scsi_bufflen(sc));
sc->scsi_done(sc);
return 0;
}
@ -1145,7 +1145,7 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
iscsi_ctask_mtask_cleanup(ctask);
sc->result = err;
sc->resid = sc->request_bufflen;
scsi_set_resid(sc, scsi_bufflen(sc));
if (conn->ctask == ctask)
conn->ctask = NULL;
/* release ref from queuecommand */