* [PATCH v2 15/30] cxlflash: Fix location of setting resid
@ 2015-09-16 16:57 Matthew R. Ochs
0 siblings, 0 replies; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 16:57 UTC (permalink / raw)
To: linux-scsi, James.Bottomley, nab, brking, imunsie, dja,
andrew.donnellan
Cc: mikey, linuxppc-dev, Manoj N. Kumar
The resid is incorrectly set which can lead to unnecessary retry
attempts by the stack. This is due to resid _always_ being set
using a value returned from the adapter. Instead, the value
should only be interpreted and set when in an underrun scenario.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/main.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 29e40cc..b3838af 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -107,6 +107,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
{
struct sisl_ioarcb *ioarcb;
struct sisl_ioasa *ioasa;
+ u32 resid;
if (unlikely(!cmd))
return;
@@ -115,9 +116,10 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
ioasa = &(cmd->sa);
if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) {
- pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
- __func__, cmd, scp);
- scp->result = (DID_ERROR << 16);
+ resid = ioasa->resid;
+ scsi_set_resid(scp, resid);
+ pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
+ __func__, cmd, scp, resid);
}
if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) {
@@ -158,8 +160,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* If the SISL_RC_FLAGS_OVERRUN flag was set,
* then we will handle this error else where.
* If not then we must handle it here.
- * This is probably an AFU bug. We will
- * attempt a retry to see if that resolves it.
+ * This is probably an AFU bug.
*/
scp->result = (DID_ERROR << 16);
}
@@ -183,7 +184,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* We have an AFU error */
switch (ioasa->rc.afu_rc) {
case SISL_AFU_RC_NO_CHANNELS:
- scp->result = (DID_MEDIUM_ERROR << 16);
+ scp->result = (DID_NO_CONNECT << 16);
break;
case SISL_AFU_RC_DATA_DMA_ERR:
switch (ioasa->afu_extra) {
@@ -217,7 +218,6 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
static void cmd_complete(struct afu_cmd *cmd)
{
struct scsi_cmnd *scp;
- u32 resid;
ulong lock_flags;
struct afu *afu = cmd->parent;
struct cxlflash_cfg *cfg = afu->parent;
@@ -229,14 +229,11 @@ static void cmd_complete(struct afu_cmd *cmd)
if (cmd->rcb.scp) {
scp = cmd->rcb.scp;
- if (unlikely(cmd->sa.rc.afu_rc ||
- cmd->sa.rc.scsi_rc ||
- cmd->sa.rc.fc_rc))
+ if (unlikely(cmd->sa.ioasc))
process_cmd_err(cmd, scp);
else
scp->result = (DID_OK << 16);
- resid = cmd->sa.resid;
cmd_is_tmf = cmd->cmd_tmf;
cmd_checkin(cmd); /* Don't use cmd after here */
@@ -244,7 +241,6 @@ static void cmd_complete(struct afu_cmd *cmd)
"ioasc=%d\n", __func__, scp, scp->result,
cmd->sa.ioasc);
- scsi_set_resid(scp, resid);
scsi_dma_unmap(scp);
scp->scsi_done(scp);
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v2 15/30] cxlflash: Fix location of setting resid
2015-09-16 21:23 [PATCH v2 00/30] cxlflash: Miscellaneous bug fixes and corrections Matthew R. Ochs
@ 2015-09-16 21:30 ` Matthew R. Ochs
2015-09-21 18:28 ` Brian King
0 siblings, 1 reply; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 21:30 UTC (permalink / raw)
To: linux-scsi, James Bottomley, Nicholas A. Bellinger, Brian King,
Ian Munsie, Daniel Axtens, Andrew Donnellan
Cc: Michael Neuling, linuxppc-dev, Manoj N. Kumar
The resid is incorrectly set which can lead to unnecessary retry
attempts by the stack. This is due to resid _always_ being set
using a value returned from the adapter. Instead, the value
should only be interpreted and set when in an underrun scenario.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
drivers/scsi/cxlflash/main.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 29e40cc..b3838af 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -107,6 +107,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
{
struct sisl_ioarcb *ioarcb;
struct sisl_ioasa *ioasa;
+ u32 resid;
if (unlikely(!cmd))
return;
@@ -115,9 +116,10 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
ioasa = &(cmd->sa);
if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) {
- pr_debug("%s: cmd underrun cmd = %p scp = %p\n",
- __func__, cmd, scp);
- scp->result = (DID_ERROR << 16);
+ resid = ioasa->resid;
+ scsi_set_resid(scp, resid);
+ pr_debug("%s: cmd underrun cmd = %p scp = %p, resid = %d\n",
+ __func__, cmd, scp, resid);
}
if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) {
@@ -158,8 +160,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* If the SISL_RC_FLAGS_OVERRUN flag was set,
* then we will handle this error else where.
* If not then we must handle it here.
- * This is probably an AFU bug. We will
- * attempt a retry to see if that resolves it.
+ * This is probably an AFU bug.
*/
scp->result = (DID_ERROR << 16);
}
@@ -183,7 +184,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
/* We have an AFU error */
switch (ioasa->rc.afu_rc) {
case SISL_AFU_RC_NO_CHANNELS:
- scp->result = (DID_MEDIUM_ERROR << 16);
+ scp->result = (DID_NO_CONNECT << 16);
break;
case SISL_AFU_RC_DATA_DMA_ERR:
switch (ioasa->afu_extra) {
@@ -217,7 +218,6 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
static void cmd_complete(struct afu_cmd *cmd)
{
struct scsi_cmnd *scp;
- u32 resid;
ulong lock_flags;
struct afu *afu = cmd->parent;
struct cxlflash_cfg *cfg = afu->parent;
@@ -229,14 +229,11 @@ static void cmd_complete(struct afu_cmd *cmd)
if (cmd->rcb.scp) {
scp = cmd->rcb.scp;
- if (unlikely(cmd->sa.rc.afu_rc ||
- cmd->sa.rc.scsi_rc ||
- cmd->sa.rc.fc_rc))
+ if (unlikely(cmd->sa.ioasc))
process_cmd_err(cmd, scp);
else
scp->result = (DID_OK << 16);
- resid = cmd->sa.resid;
cmd_is_tmf = cmd->cmd_tmf;
cmd_checkin(cmd); /* Don't use cmd after here */
@@ -244,7 +241,6 @@ static void cmd_complete(struct afu_cmd *cmd)
"ioasc=%d\n", __func__, scp, scp->result,
cmd->sa.ioasc);
- scsi_set_resid(scp, resid);
scsi_dma_unmap(scp);
scp->scsi_done(scp);
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 15/30] cxlflash: Fix location of setting resid
2015-09-16 21:30 ` [PATCH v2 15/30] cxlflash: Fix location of setting resid Matthew R. Ochs
@ 2015-09-21 18:28 ` Brian King
0 siblings, 0 replies; 3+ messages in thread
From: Brian King @ 2015-09-21 18:28 UTC (permalink / raw)
To: Matthew R. Ochs, linux-scsi, James Bottomley,
Nicholas A. Bellinger, Ian Munsie, Daniel Axtens,
Andrew Donnellan
Cc: Michael Neuling, linuxppc-dev, Manoj N. Kumar
On 09/16/2015 04:30 PM, Matthew R. Ochs wrote:
> @@ -158,8 +160,7 @@ static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp)
> /* If the SISL_RC_FLAGS_OVERRUN flag was set,
> * then we will handle this error else where.
> * If not then we must handle it here.
> - * This is probably an AFU bug. We will
> - * attempt a retry to see if that resolves it.
> + * This is probably an AFU bug.
I would tend to agree with this statement. ioasa->resid should be zero in an overrun case.
> */
> scp->result = (DID_ERROR << 16);
> }
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
--
Brian King
Power Linux I/O
IBM Linux Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
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