* [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
@ 2010-05-18 5:13 Nicholas A. Bellinger
2010-05-30 9:36 ` Boaz Harrosh
0 siblings, 1 reply; 6+ messages in thread
From: Nicholas A. Bellinger @ 2010-05-18 5:13 UTC (permalink / raw)
To: stgt-devel, linux-scsi, FUJITA Tomonori, Mike Christie
Cc: James Bottomley, Douglas Gilbert, Nicholas Bellinger
From: Nicholas Bellinger <nab@linux-iscsi.org>
This patch updates usr/bs_sg.c:bs_sg_cmd_submit() to process incoming scsi-generic IO
of type SG_DXFER_TO_DEV and SG_DXFER_FROM_DEV using a single new struct scsi_cmnd->sg_iovec
set using existing scsi_cmd.h scsi_get_[out,in]_[buffer,length]() macros.
It also makes set_cmd_failed() properly return SAM_STAT_CHECK_CONDITION, which is expected
by the bs_sg_cmd_submit() caller in usr/scsi.c:scsi_cmd_perform()
Finally, this patch adds struct backingstore_template->bs_passthrough=1 that is used by
bs_sg.c here and the next patch to hand off struct scsi_cmd for CDB passthrough.
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
usr/bs_sg.c | 31 ++++++++++++++++++++++++-------
usr/scsi_cmnd.h | 4 ++++
usr/tgtd.h | 1 +
3 files changed, 29 insertions(+), 7 deletions(-)
diff --git a/usr/bs_sg.c b/usr/bs_sg.c
index 8baa480..9696392 100644
--- a/usr/bs_sg.c
+++ b/usr/bs_sg.c
@@ -82,7 +82,7 @@ static int graceful_write(int fd, void *p_write, int to_write)
return 0;
}
-static void set_cmd_failed(struct scsi_cmd *cmd)
+static int set_cmd_failed(struct scsi_cmd *cmd)
{
int result = SAM_STAT_CHECK_CONDITION;
uint16_t asc = ASC_READ_ERROR;
@@ -90,11 +90,14 @@ static void set_cmd_failed(struct scsi_cmd *cmd)
scsi_set_result(cmd, result);
sense_data_build(cmd, key, asc);
+
+ return result;
}
static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
{
struct scsi_lu *dev = cmd->dev;
+ struct sg_iovec *iov = &cmd->sg_iovec;
int fd = dev->fd;
struct sg_io_hdr io_hdr;
int err = 0;
@@ -104,14 +107,27 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
io_hdr.cmd_len = cmd->scb_len;
io_hdr.cmdp = cmd->scb;
+ if (scsi_get_data_dir(cmd) == DATA_BIDIRECTIONAL) {
+ eprintf("Unable to process DATA_BIDIRECTIONAL to"
+ " SG_IO backstore\n");
+ return set_cmd_failed(cmd);
+ }
+
if (scsi_get_data_dir(cmd) == DATA_WRITE) {
io_hdr.dxfer_direction = SG_DXFER_TO_DEV;
- io_hdr.dxfer_len = scsi_get_out_length(cmd);
- io_hdr.dxferp = (void *)scsi_get_out_buffer(cmd);
- } else {
+ io_hdr.dxfer_len = iov->iov_len = scsi_get_out_length(cmd);
+ iov->iov_base = (void *)scsi_get_out_buffer(cmd);
+ io_hdr.dxferp = &cmd->sg_iovec;
+ io_hdr.iovec_count = 1;
+ } else if (scsi_get_data_dir(cmd) == DATA_READ) {
io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
- io_hdr.dxfer_len = scsi_get_in_length(cmd);
- io_hdr.dxferp = (void *)scsi_get_in_buffer(cmd);
+ io_hdr.dxfer_len = iov->iov_len = scsi_get_in_length(cmd);
+ iov->iov_base = (void *)scsi_get_in_buffer(cmd);
+ io_hdr.dxferp = &cmd->sg_iovec;
+ io_hdr.iovec_count = 1;
+ } else {
+ io_hdr.dxfer_direction = SG_DXFER_NONE;
+ io_hdr.dxfer_len = 0;
}
io_hdr.mx_sb_len = sizeof(cmd->sense_buffer);
io_hdr.sbp = cmd->sense_buffer;
@@ -125,7 +141,7 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
set_cmd_async(cmd);
else {
eprintf("failed to start cmd 0x%p\n", cmd);
- set_cmd_failed(cmd);
+ return set_cmd_failed(cmd);
}
return 0;
}
@@ -238,6 +254,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
static struct backingstore_template sg_bst = {
.bs_name = "sg",
.bs_datasize = 0,
+ .bs_passthrough = 1,
.bs_open = bs_sg_open,
.bs_close = bs_sg_close,
.bs_cmd_submit = bs_sg_cmd_submit,
diff --git a/usr/scsi_cmnd.h b/usr/scsi_cmnd.h
index 011f3e6..776ffb3 100644
--- a/usr/scsi_cmnd.h
+++ b/usr/scsi_cmnd.h
@@ -17,6 +17,8 @@ struct scsi_data_buffer {
uint64_t buffer;
};
+#include <scsi/sg.h>
+
struct scsi_cmd {
struct target *c_target;
/* linked it_nexus->cmd_hash_list */
@@ -31,6 +33,8 @@ struct scsi_cmd {
enum data_direction data_dir;
struct scsi_data_buffer in_sdb;
struct scsi_data_buffer out_sdb;
+ /* used for bs_sg.c:bs_sg_cmd_submit() */
+ struct sg_iovec sg_iovec;
uint64_t cmd_itn_id;
uint64_t offset;
diff --git a/usr/tgtd.h b/usr/tgtd.h
index 3323a9b..4f26a29 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -117,6 +117,7 @@ struct device_type_template {
struct backingstore_template {
const char *bs_name;
int bs_datasize;
+ int bs_passthrough;
int (*bs_open)(struct scsi_lu *dev, char *path, int *fd, uint64_t *size);
void (*bs_close)(struct scsi_lu *dev);
int (*bs_init)(struct scsi_lu *dev);
--
1.5.6.5
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
2010-05-18 5:13 [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores Nicholas A. Bellinger
@ 2010-05-30 9:36 ` Boaz Harrosh
2010-05-31 2:45 ` Nicholas A. Bellinger
2010-05-31 3:32 ` FUJITA Tomonori
0 siblings, 2 replies; 6+ messages in thread
From: Boaz Harrosh @ 2010-05-30 9:36 UTC (permalink / raw)
To: Nicholas A. Bellinger
Cc: stgt-devel, linux-scsi, FUJITA Tomonori, Mike Christie,
James Bottomley, Douglas Gilbert
On 05/18/2010 08:13 AM, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <nab@linux-iscsi.org>
>
> This patch updates usr/bs_sg.c:bs_sg_cmd_submit() to process incoming scsi-generic IO
> of type SG_DXFER_TO_DEV and SG_DXFER_FROM_DEV using a single new struct scsi_cmnd->sg_iovec
> set using existing scsi_cmd.h scsi_get_[out,in]_[buffer,length]() macros.
>
> It also makes set_cmd_failed() properly return SAM_STAT_CHECK_CONDITION, which is expected
> by the bs_sg_cmd_submit() caller in usr/scsi.c:scsi_cmd_perform()
>
> Finally, this patch adds struct backingstore_template->bs_passthrough=1 that is used by
> bs_sg.c here and the next patch to hand off struct scsi_cmd for CDB passthrough.
>
> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
> ---
> usr/bs_sg.c | 31 ++++++++++++++++++++++++-------
Why not add a new bs_bsg.c backing store that goes through BSG and not SG
and do it properly for all type of targets and commands?
Just a thought.
> usr/scsi_cmnd.h | 4 ++++
> usr/tgtd.h | 1 +
> 3 files changed, 29 insertions(+), 7 deletions(-)
>
> diff --git a/usr/bs_sg.c b/usr/bs_sg.c
> index 8baa480..9696392 100644
> --- a/usr/bs_sg.c
> +++ b/usr/bs_sg.c
> @@ -82,7 +82,7 @@ static int graceful_write(int fd, void *p_write, int to_write)
> return 0;
> }
>
> -static void set_cmd_failed(struct scsi_cmd *cmd)
> +static int set_cmd_failed(struct scsi_cmd *cmd)
> {
> int result = SAM_STAT_CHECK_CONDITION;
> uint16_t asc = ASC_READ_ERROR;
> @@ -90,11 +90,14 @@ static void set_cmd_failed(struct scsi_cmd *cmd)
>
> scsi_set_result(cmd, result);
> sense_data_build(cmd, key, asc);
> +
> + return result;
> }
>
> static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> {
> struct scsi_lu *dev = cmd->dev;
> + struct sg_iovec *iov = &cmd->sg_iovec;
> int fd = dev->fd;
> struct sg_io_hdr io_hdr;
> int err = 0;
> @@ -104,14 +107,27 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> io_hdr.cmd_len = cmd->scb_len;
> io_hdr.cmdp = cmd->scb;
>
> + if (scsi_get_data_dir(cmd) == DATA_BIDIRECTIONAL) {
Using bsg just really cleans this all function up.
IN_CMD => IN_HDR
OUT_CMD => OUT_HDR
no ifs and buts. The tgt's cmd looks like struct sg_io_v4 as if they
are twins ;-)
> + eprintf("Unable to process DATA_BIDIRECTIONAL to"
> + " SG_IO backstore\n");
> + return set_cmd_failed(cmd);
> + }
> +
> if (scsi_get_data_dir(cmd) == DATA_WRITE) {
> io_hdr.dxfer_direction = SG_DXFER_TO_DEV;
> - io_hdr.dxfer_len = scsi_get_out_length(cmd);
> - io_hdr.dxferp = (void *)scsi_get_out_buffer(cmd);
dxferp is already void* why do you need the cast?
> - } else {
> + io_hdr.dxfer_len = iov->iov_len = scsi_get_out_length(cmd);
> + iov->iov_base = (void *)scsi_get_out_buffer(cmd);
> + io_hdr.dxferp = &cmd->sg_iovec;
> + io_hdr.iovec_count = 1;
> + } else if (scsi_get_data_dir(cmd) == DATA_READ) {
> io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
> - io_hdr.dxfer_len = scsi_get_in_length(cmd);
> - io_hdr.dxferp = (void *)scsi_get_in_buffer(cmd);
> + io_hdr.dxfer_len = iov->iov_len = scsi_get_in_length(cmd);
> + iov->iov_base = (void *)scsi_get_in_buffer(cmd);
> + io_hdr.dxferp = &cmd->sg_iovec;
> + io_hdr.iovec_count = 1;
> + } else {
> + io_hdr.dxfer_direction = SG_DXFER_NONE;
> + io_hdr.dxfer_len = 0;
> }
> io_hdr.mx_sb_len = sizeof(cmd->sense_buffer);
> io_hdr.sbp = cmd->sense_buffer;
You might want to look into the new SG_FLAG_Q_AT_TAIL but this is available
only in new Kernels so it'll be a little hack
> @@ -125,7 +141,7 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> set_cmd_async(cmd);
> else {
> eprintf("failed to start cmd 0x%p\n", cmd);
> - set_cmd_failed(cmd);
> + return set_cmd_failed(cmd);
> }
> return 0;
> }
> @@ -238,6 +254,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
> static struct backingstore_template sg_bst = {
> .bs_name = "sg",
> .bs_datasize = 0,
> + .bs_passthrough = 1,
> .bs_open = bs_sg_open,
> .bs_close = bs_sg_close,
> .bs_cmd_submit = bs_sg_cmd_submit,
And again the Second patch should just fold into this one. And the final disposition will
just set the .bs_cmd_submit to the proper one.
[BTW if you want to keep struct backingstore_template sg_bst const (Which it is not, but
should be) then just have two of them and switch between them]
Boaz
> diff --git a/usr/scsi_cmnd.h b/usr/scsi_cmnd.h
> index 011f3e6..776ffb3 100644
> --- a/usr/scsi_cmnd.h
> +++ b/usr/scsi_cmnd.h
> @@ -17,6 +17,8 @@ struct scsi_data_buffer {
> uint64_t buffer;
> };
>
> +#include <scsi/sg.h>
> +
> struct scsi_cmd {
> struct target *c_target;
> /* linked it_nexus->cmd_hash_list */
> @@ -31,6 +33,8 @@ struct scsi_cmd {
> enum data_direction data_dir;
> struct scsi_data_buffer in_sdb;
> struct scsi_data_buffer out_sdb;
> + /* used for bs_sg.c:bs_sg_cmd_submit() */
> + struct sg_iovec sg_iovec;
>
> uint64_t cmd_itn_id;
> uint64_t offset;
> diff --git a/usr/tgtd.h b/usr/tgtd.h
> index 3323a9b..4f26a29 100644
> --- a/usr/tgtd.h
> +++ b/usr/tgtd.h
> @@ -117,6 +117,7 @@ struct device_type_template {
> struct backingstore_template {
> const char *bs_name;
> int bs_datasize;
> + int bs_passthrough;
> int (*bs_open)(struct scsi_lu *dev, char *path, int *fd, uint64_t *size);
> void (*bs_close)(struct scsi_lu *dev);
> int (*bs_init)(struct scsi_lu *dev);
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
2010-05-30 9:36 ` Boaz Harrosh
@ 2010-05-31 2:45 ` Nicholas A. Bellinger
2010-05-31 3:32 ` FUJITA Tomonori
1 sibling, 0 replies; 6+ messages in thread
From: Nicholas A. Bellinger @ 2010-05-31 2:45 UTC (permalink / raw)
To: Boaz Harrosh
Cc: stgt-devel, linux-scsi, FUJITA Tomonori, Mike Christie,
James Bottomley, Douglas Gilbert, Hannes Reinecke, Gerd Hoffmann,
Kevin Wolf
On Sun, 2010-05-30 at 12:36 +0300, Boaz Harrosh wrote:
> On 05/18/2010 08:13 AM, Nicholas A. Bellinger wrote:
> > From: Nicholas Bellinger <nab@linux-iscsi.org>
> >
> > This patch updates usr/bs_sg.c:bs_sg_cmd_submit() to process incoming scsi-generic IO
> > of type SG_DXFER_TO_DEV and SG_DXFER_FROM_DEV using a single new struct scsi_cmnd->sg_iovec
> > set using existing scsi_cmd.h scsi_get_[out,in]_[buffer,length]() macros.
> >
> > It also makes set_cmd_failed() properly return SAM_STAT_CHECK_CONDITION, which is expected
> > by the bs_sg_cmd_submit() caller in usr/scsi.c:scsi_cmd_perform()
> >
> > Finally, this patch adds struct backingstore_template->bs_passthrough=1 that is used by
> > bs_sg.c here and the next patch to hand off struct scsi_cmd for CDB passthrough.
> >
> > Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
> > ---
> > usr/bs_sg.c | 31 ++++++++++++++++++++++++-------
>
> Why not add a new bs_bsg.c backing store that goes through BSG and not SG
> and do it properly for all type of targets and commands?
>
> Just a thought.
Greetings Boaz,
I completely agree with you here and think that BSG is the next logical
direction for expanding our target capabilities and for adding some
manner of I_T nexus auto-configuration between STGT userspace fabric
modules <-> TCM_Loop multi-fabric target port LUNs. That said, I will
start groking BSG and look at adding a new bs_bsg backstore for STGT
soon for extended user -> kernel passthrough ops soon.
Also, the BSG direction is going to make alot of sense with the QEMU-KVM
HBA Emulation <-> TCM_Loop efforts too. However I believe at least for
megraid_sas that TMRs are handled in the driver for LDs and not
processed directly by the 8708EM2 PowerPC Core firmware. ;)
Best,
--nab
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
2010-05-30 9:36 ` Boaz Harrosh
2010-05-31 2:45 ` Nicholas A. Bellinger
@ 2010-05-31 3:32 ` FUJITA Tomonori
2010-05-31 4:06 ` Nicholas A. Bellinger
1 sibling, 1 reply; 6+ messages in thread
From: FUJITA Tomonori @ 2010-05-31 3:32 UTC (permalink / raw)
To: bharrosh
Cc: nab, stgt, linux-scsi, fujita.tomonori, michaelc, James.Bottomley,
dgilbert
On Sun, 30 May 2010 12:36:18 +0300
Boaz Harrosh <bharrosh@panasas.com> wrote:
> > @@ -125,7 +141,7 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> > set_cmd_async(cmd);
> > else {
> > eprintf("failed to start cmd 0x%p\n", cmd);
> > - set_cmd_failed(cmd);
> > + return set_cmd_failed(cmd);
> > }
> > return 0;
> > }
> > @@ -238,6 +254,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
> > static struct backingstore_template sg_bst = {
> > .bs_name = "sg",
> > .bs_datasize = 0,
> > + .bs_passthrough = 1,
> > .bs_open = bs_sg_open,
> > .bs_close = bs_sg_close,
> > .bs_cmd_submit = bs_sg_cmd_submit,
>
> And again the Second patch should just fold into this one. And the final disposition will
> just set the .bs_cmd_submit to the proper one.
Hmm, that means this patchset adds new I/O code with sg (or
bsg). That's not passthrough..
I think that passthrough needs to overwrite some of struct
device_type_template and modify target_cmd_queue().
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
2010-05-31 3:32 ` FUJITA Tomonori
@ 2010-05-31 4:06 ` Nicholas A. Bellinger
2010-05-31 4:25 ` FUJITA Tomonori
0 siblings, 1 reply; 6+ messages in thread
From: Nicholas A. Bellinger @ 2010-05-31 4:06 UTC (permalink / raw)
To: FUJITA Tomonori
Cc: bharrosh, stgt, linux-scsi, michaelc, James.Bottomley, dgilbert
On Mon, 2010-05-31 at 12:32 +0900, FUJITA Tomonori wrote:
> On Sun, 30 May 2010 12:36:18 +0300
> Boaz Harrosh <bharrosh@panasas.com> wrote:
>
> > > @@ -125,7 +141,7 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> > > set_cmd_async(cmd);
> > > else {
> > > eprintf("failed to start cmd 0x%p\n", cmd);
> > > - set_cmd_failed(cmd);
> > > + return set_cmd_failed(cmd);
> > > }
> > > return 0;
> > > }
> > > @@ -238,6 +254,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
> > > static struct backingstore_template sg_bst = {
> > > .bs_name = "sg",
> > > .bs_datasize = 0,
> > > + .bs_passthrough = 1,
> > > .bs_open = bs_sg_open,
> > > .bs_close = bs_sg_close,
> > > .bs_cmd_submit = bs_sg_cmd_submit,
> >
> > And again the Second patch should just fold into this one. And the final disposition will
> > just set the .bs_cmd_submit to the proper one.
>
> Hmm, that means this patchset adds new I/O code with sg (or
> bsg). That's not passthrough..
>
> I think that passthrough needs to overwrite some of struct
> device_type_template and modify target_cmd_queue().
Indeed. Expecting the passthrough to bypass the STGT port and CDB
emulation at the top of scsi_cmd_perform() would probably make sense
AFAICT.
So that said, at which spot in target_cmd_queue() would it make sense
for incoming struct scsi_cmd to be handled off for passthrough..?
Best,
--nab
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores
2010-05-31 4:06 ` Nicholas A. Bellinger
@ 2010-05-31 4:25 ` FUJITA Tomonori
0 siblings, 0 replies; 6+ messages in thread
From: FUJITA Tomonori @ 2010-05-31 4:25 UTC (permalink / raw)
To: nab
Cc: fujita.tomonori, bharrosh, stgt, linux-scsi, michaelc,
James.Bottomley, dgilbert
On Sun, 30 May 2010 21:06:40 -0700
"Nicholas A. Bellinger" <nab@linux-iscsi.org> wrote:
> On Mon, 2010-05-31 at 12:32 +0900, FUJITA Tomonori wrote:
> > On Sun, 30 May 2010 12:36:18 +0300
> > Boaz Harrosh <bharrosh@panasas.com> wrote:
> >
> > > > @@ -125,7 +141,7 @@ static int bs_sg_cmd_submit(struct scsi_cmd *cmd)
> > > > set_cmd_async(cmd);
> > > > else {
> > > > eprintf("failed to start cmd 0x%p\n", cmd);
> > > > - set_cmd_failed(cmd);
> > > > + return set_cmd_failed(cmd);
> > > > }
> > > > return 0;
> > > > }
> > > > @@ -238,6 +254,7 @@ static int bs_sg_cmd_done(struct scsi_cmd *cmd)
> > > > static struct backingstore_template sg_bst = {
> > > > .bs_name = "sg",
> > > > .bs_datasize = 0,
> > > > + .bs_passthrough = 1,
> > > > .bs_open = bs_sg_open,
> > > > .bs_close = bs_sg_close,
> > > > .bs_cmd_submit = bs_sg_cmd_submit,
> > >
> > > And again the Second patch should just fold into this one. And the final disposition will
> > > just set the .bs_cmd_submit to the proper one.
> >
> > Hmm, that means this patchset adds new I/O code with sg (or
> > bsg). That's not passthrough..
> >
> > I think that passthrough needs to overwrite some of struct
> > device_type_template and modify target_cmd_queue().
>
> Indeed. Expecting the passthrough to bypass the STGT port and CDB
> emulation at the top of scsi_cmd_perform() would probably make sense
> AFAICT.
>
> So that said, at which spot in target_cmd_queue() would it make sense
> for incoming struct scsi_cmd to be handled off for passthrough..?
Yeah, surely, scsi_cmd_perform() is too late since we need to avoid
cmd_enabled() checking. So you need to modify target_cmd_queue() or
modify cmd_enabled() to return true for passthrough commands at all
times.
Another issue is that you need to skip some checking (such as UA) in
scsi_cmd_perform(). I don't have a clear idea how we can implement
passthough support cleanly. I guess that we need to try some
implementations.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2010-05-18 5:13 [PATCH 1/2] [tgt]: Add proper CDB passthrough for SG_IO backstores Nicholas A. Bellinger
2010-05-30 9:36 ` Boaz Harrosh
2010-05-31 2:45 ` Nicholas A. Bellinger
2010-05-31 3:32 ` FUJITA Tomonori
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