* [PATCH 0/3] srp/srpt - some useful patches
@ 2016-12-28 11:00 Max Gurtovoy
[not found] ` <1482922813-8392-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
0 siblings, 1 reply; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:00 UTC (permalink / raw)
To: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w, Max Gurtovoy
No bug fixes, but few improvements that might help.
Max Gurtovoy (3):
IB/srp: allocate ib_qp_attr on the stack
IB/srpt: allocate ib_qp_attr on the stack
IB/srpt: fix compilation warning
drivers/infiniband/ulp/srp/ib_srp.c | 51 ++++++++++++--------------------
drivers/infiniband/ulp/srpt/ib_srpt.c | 20 +++++--------
2 files changed, 27 insertions(+), 44 deletions(-)
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^ permalink raw reply [flat|nested] 14+ messages in thread
* [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
@ 2016-12-28 11:00 ` Max Gurtovoy
[not found] ` <1482922813-8392-2-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:00 ` [PATCH 2/3] IB/srpt: " Max Gurtovoy
2016-12-28 11:00 ` [PATCH 3/3] IB/srpt: fix compilation warning Max Gurtovoy
2 siblings, 1 reply; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:00 UTC (permalink / raw)
To: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w, Max Gurtovoy
No reason to allocate it dynamically.
Tested-by: Israel Rukshin <israelr-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/ulp/srp/ib_srp.c | 51 +++++++++++++----------------------
1 files changed, 19 insertions(+), 32 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index d980fb4..8a003eb 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -263,33 +263,28 @@ static void srp_qp_event(struct ib_event *event, void *context)
static int srp_init_qp(struct srp_target_port *target,
struct ib_qp *qp)
{
- struct ib_qp_attr *attr;
+ struct ib_qp_attr attr;
int ret;
- attr = kmalloc(sizeof *attr, GFP_KERNEL);
- if (!attr)
- return -ENOMEM;
-
ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
target->srp_host->port,
be16_to_cpu(target->pkey),
- &attr->pkey_index);
+ &attr.pkey_index);
if (ret)
goto out;
- attr->qp_state = IB_QPS_INIT;
- attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
+ attr.qp_state = IB_QPS_INIT;
+ attr.qp_access_flags = (IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE);
- attr->port_num = target->srp_host->port;
+ attr.port_num = target->srp_host->port;
- ret = ib_modify_qp(qp, attr,
+ ret = ib_modify_qp(qp, &attr,
IB_QP_STATE |
IB_QP_PKEY_INDEX |
IB_QP_ACCESS_FLAGS |
IB_QP_PORT);
out:
- kfree(attr);
return ret;
}
@@ -2280,7 +2275,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
struct srp_rdma_ch *ch)
{
struct srp_target_port *target = ch->target;
- struct ib_qp_attr *qp_attr = NULL;
+ struct ib_qp_attr qp_attr;
int attr_mask = 0;
int ret;
int i;
@@ -2312,44 +2307,36 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
goto error;
}
- ret = -ENOMEM;
- qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
- if (!qp_attr)
- goto error;
-
- qp_attr->qp_state = IB_QPS_RTR;
- ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ qp_attr.qp_state = IB_QPS_RTR;
+ ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &attr_mask);
if (ret)
- goto error_free;
+ goto error;
- ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
+ ret = ib_modify_qp(ch->qp, &qp_attr, attr_mask);
if (ret)
- goto error_free;
+ goto error;
for (i = 0; i < target->queue_size; i++) {
struct srp_iu *iu = ch->rx_ring[i];
ret = srp_post_recv(ch, iu);
if (ret)
- goto error_free;
+ goto error;
}
- qp_attr->qp_state = IB_QPS_RTS;
- ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ qp_attr.qp_state = IB_QPS_RTS;
+ ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &attr_mask);
if (ret)
- goto error_free;
+ goto error;
- target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
+ target->rq_tmo_jiffies = srp_compute_rq_tmo(&qp_attr, attr_mask);
- ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
+ ret = ib_modify_qp(ch->qp, &qp_attr, attr_mask);
if (ret)
- goto error_free;
+ goto error;
ret = ib_send_cm_rtu(cm_id, NULL, 0);
-error_free:
- kfree(qp_attr);
-
error:
ch->status = ret;
}
--
1.7.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 2/3] IB/srpt: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:00 ` [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack Max Gurtovoy
@ 2016-12-28 11:00 ` Max Gurtovoy
[not found] ` <1482922813-8392-3-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:00 ` [PATCH 3/3] IB/srpt: fix compilation warning Max Gurtovoy
2 siblings, 1 reply; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:00 UTC (permalink / raw)
To: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w, Max Gurtovoy
No reason to allocate it dynamically.
Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/ulp/srpt/ib_srpt.c | 18 +++++++-----------
1 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 0b1f69e..aa18d74 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -984,24 +984,20 @@ static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
*/
static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
{
- struct ib_qp_attr *attr;
+ struct ib_qp_attr attr;
int ret;
- attr = kzalloc(sizeof(*attr), GFP_KERNEL);
- if (!attr)
- return -ENOMEM;
-
- attr->qp_state = IB_QPS_INIT;
- attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
+ memset(&attr, 0, sizeof(attr));
+ attr.qp_state = IB_QPS_INIT;
+ attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE;
- attr->port_num = ch->sport->port;
- attr->pkey_index = 0;
+ attr.port_num = ch->sport->port;
+ attr.pkey_index = 0;
- ret = ib_modify_qp(qp, attr,
+ ret = ib_modify_qp(qp, &attr,
IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
IB_QP_PKEY_INDEX);
- kfree(attr);
return ret;
}
--
1.7.1
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^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 3/3] IB/srpt: fix compilation warning
[not found] ` <1482922813-8392-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:00 ` [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack Max Gurtovoy
2016-12-28 11:00 ` [PATCH 2/3] IB/srpt: " Max Gurtovoy
@ 2016-12-28 11:00 ` Max Gurtovoy
[not found] ` <1482922813-8392-4-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2 siblings, 1 reply; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:00 UTC (permalink / raw)
To: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w, Max Gurtovoy
warning: 'prev_nents' may be used uninitialized in this function
Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/ulp/srpt/ib_srpt.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index aa18d74..b36f9a5 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -809,7 +809,7 @@ static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
struct srpt_rdma_ch *ch = ioctx->ch;
struct scatterlist *prev = NULL;
- unsigned prev_nents;
+ unsigned prev_nents = 0;
int ret, i;
if (nbufs == 1) {
--
1.7.1
--
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^ permalink raw reply related [flat|nested] 14+ messages in thread
* Re: [PATCH 2/3] IB/srpt: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-3-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
@ 2016-12-28 11:06 ` Yuval Shaia
2016-12-28 11:38 ` Max Gurtovoy
2016-12-28 11:39 ` Bart Van Assche
2016-12-28 12:57 ` Leon Romanovsky
2 siblings, 1 reply; 14+ messages in thread
From: Yuval Shaia @ 2016-12-28 11:06 UTC (permalink / raw)
To: Max Gurtovoy
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
One minor comment in line but w/ or w/o it:
Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
On Wed, Dec 28, 2016 at 01:00:12PM +0200, Max Gurtovoy wrote:
> No reason to allocate it dynamically.
>
> Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---
> drivers/infiniband/ulp/srpt/ib_srpt.c | 18 +++++++-----------
> 1 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
> index 0b1f69e..aa18d74 100644
> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
> @@ -984,24 +984,20 @@ static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
> */
> static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
> {
> - struct ib_qp_attr *attr;
> + struct ib_qp_attr attr;
> int ret;
>
> - attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> - if (!attr)
> - return -ENOMEM;
> -
> - attr->qp_state = IB_QPS_INIT;
> - attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
> + memset(&attr, 0, sizeof(attr));
> + attr.qp_state = IB_QPS_INIT;
> + attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
> IB_ACCESS_REMOTE_WRITE;
> - attr->port_num = ch->sport->port;
> - attr->pkey_index = 0;
> + attr.port_num = ch->sport->port;
> + attr.pkey_index = 0;
Correct me if i'm wrong but this looks like redundant since we zeroed the
entire attr object few lines ago.
>
> - ret = ib_modify_qp(qp, attr,
> + ret = ib_modify_qp(qp, &attr,
> IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
> IB_QP_PKEY_INDEX);
>
> - kfree(attr);
> return ret;
> }
>
> --
> 1.7.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-2-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
@ 2016-12-28 11:14 ` Yuval Shaia
2016-12-28 11:33 ` Max Gurtovoy
2016-12-28 11:38 ` Bart Van Assche
1 sibling, 1 reply; 14+ messages in thread
From: Yuval Shaia @ 2016-12-28 11:14 UTC (permalink / raw)
To: Max Gurtovoy
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
On Wed, Dec 28, 2016 at 01:00:11PM +0200, Max Gurtovoy wrote:
> No reason to allocate it dynamically.
>
> Tested-by: Israel Rukshin <israelr-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---
> drivers/infiniband/ulp/srp/ib_srp.c | 51 +++++++++++++----------------------
> 1 files changed, 19 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
> index d980fb4..8a003eb 100644
> --- a/drivers/infiniband/ulp/srp/ib_srp.c
> +++ b/drivers/infiniband/ulp/srp/ib_srp.c
> @@ -263,33 +263,28 @@ static void srp_qp_event(struct ib_event *event, void *context)
> static int srp_init_qp(struct srp_target_port *target,
> struct ib_qp *qp)
> {
> - struct ib_qp_attr *attr;
> + struct ib_qp_attr attr;
> int ret;
>
> - attr = kmalloc(sizeof *attr, GFP_KERNEL);
> - if (!attr)
> - return -ENOMEM;
> -
> ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
> target->srp_host->port,
> be16_to_cpu(target->pkey),
> - &attr->pkey_index);
> + &attr.pkey_index);
> if (ret)
> goto out;
>
> - attr->qp_state = IB_QPS_INIT;
> - attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
> + attr.qp_state = IB_QPS_INIT;
Since kzmalloc was not used this patch do the job it intend to do.
Do you think, while-we-are-there that it will be safer to use memset before
using the object?
> + attr.qp_access_flags = (IB_ACCESS_REMOTE_READ |
> IB_ACCESS_REMOTE_WRITE);
> - attr->port_num = target->srp_host->port;
> + attr.port_num = target->srp_host->port;
>
> - ret = ib_modify_qp(qp, attr,
> + ret = ib_modify_qp(qp, &attr,
> IB_QP_STATE |
> IB_QP_PKEY_INDEX |
> IB_QP_ACCESS_FLAGS |
> IB_QP_PORT);
>
> out:
> - kfree(attr);
> return ret;
> }
>
> @@ -2280,7 +2275,7 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
> struct srp_rdma_ch *ch)
> {
> struct srp_target_port *target = ch->target;
> - struct ib_qp_attr *qp_attr = NULL;
> + struct ib_qp_attr qp_attr;
> int attr_mask = 0;
> int ret;
> int i;
> @@ -2312,44 +2307,36 @@ static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
> goto error;
> }
>
> - ret = -ENOMEM;
> - qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
> - if (!qp_attr)
> - goto error;
> -
> - qp_attr->qp_state = IB_QPS_RTR;
> - ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
> + qp_attr.qp_state = IB_QPS_RTR;
> + ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &attr_mask);
> if (ret)
> - goto error_free;
> + goto error;
>
> - ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
> + ret = ib_modify_qp(ch->qp, &qp_attr, attr_mask);
> if (ret)
> - goto error_free;
> + goto error;
>
> for (i = 0; i < target->queue_size; i++) {
> struct srp_iu *iu = ch->rx_ring[i];
>
> ret = srp_post_recv(ch, iu);
> if (ret)
> - goto error_free;
> + goto error;
> }
>
> - qp_attr->qp_state = IB_QPS_RTS;
> - ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
> + qp_attr.qp_state = IB_QPS_RTS;
> + ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &attr_mask);
> if (ret)
> - goto error_free;
> + goto error;
>
> - target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
> + target->rq_tmo_jiffies = srp_compute_rq_tmo(&qp_attr, attr_mask);
>
> - ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
> + ret = ib_modify_qp(ch->qp, &qp_attr, attr_mask);
> if (ret)
> - goto error_free;
> + goto error;
>
> ret = ib_send_cm_rtu(cm_id, NULL, 0);
>
> -error_free:
> - kfree(qp_attr);
> -
> error:
> ch->status = ret;
> }
> --
> 1.7.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 3/3] IB/srpt: fix compilation warning
[not found] ` <1482922813-8392-4-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
@ 2016-12-28 11:18 ` Yuval Shaia
2016-12-28 11:41 ` Bart Van Assche
1 sibling, 0 replies; 14+ messages in thread
From: Yuval Shaia @ 2016-12-28 11:18 UTC (permalink / raw)
To: Max Gurtovoy
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
On Wed, Dec 28, 2016 at 01:00:13PM +0200, Max Gurtovoy wrote:
> warning: 'prev_nents' may be used uninitialized in this function
>
> Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---
> drivers/infiniband/ulp/srpt/ib_srpt.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
> index aa18d74..b36f9a5 100644
> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
> @@ -809,7 +809,7 @@ static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
> enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
> struct srpt_rdma_ch *ch = ioctx->ch;
> struct scatterlist *prev = NULL;
> - unsigned prev_nents;
> + unsigned prev_nents = 0;
> int ret, i;
>
> if (nbufs == 1) {
> --
> 1.7.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack
2016-12-28 11:14 ` Yuval Shaia
@ 2016-12-28 11:33 ` Max Gurtovoy
0 siblings, 0 replies; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:33 UTC (permalink / raw)
To: Yuval Shaia
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
>
> Since kzmalloc was not used this patch do the job it intend to do.
> Do you think, while-we-are-there that it will be safer to use memset before
> using the object?
>
You're safe because of the flags you pass to ib_modify_qp, but we can
add it.
Bart, what do you think ?
>> + attr.qp_access_flags = (IB_ACCESS_REMOTE_READ |
>> IB_ACCESS_REMOTE_WRITE);
>> - attr->port_num = target->srp_host->port;
>> + attr.port_num = target->srp_host->port;
>>
>> - ret = ib_modify_qp(qp, attr,
>> + ret = ib_modify_qp(qp, &attr,
>> IB_QP_STATE |
>> IB_QP_PKEY_INDEX |
>> IB_QP_ACCESS_FLAGS |
>> IB_QP_PORT);
>>
>> out:
>> - kfree(attr);
>> return ret;
>> }
>>
--
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/3] IB/srpt: allocate ib_qp_attr on the stack
2016-12-28 11:06 ` Yuval Shaia
@ 2016-12-28 11:38 ` Max Gurtovoy
0 siblings, 0 replies; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:38 UTC (permalink / raw)
To: Yuval Shaia
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
On 12/28/2016 1:06 PM, Yuval Shaia wrote:
> One minor comment in line but w/ or w/o it:
>
> Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
>
> On Wed, Dec 28, 2016 at 01:00:12PM +0200, Max Gurtovoy wrote:
>> No reason to allocate it dynamically.
>>
>> Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>> ---
>> drivers/infiniband/ulp/srpt/ib_srpt.c | 18 +++++++-----------
>> 1 files changed, 7 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
>> index 0b1f69e..aa18d74 100644
>> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
>> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
>> @@ -984,24 +984,20 @@ static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
>> */
>> static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
>> {
>> - struct ib_qp_attr *attr;
>> + struct ib_qp_attr attr;
>> int ret;
>>
>> - attr = kzalloc(sizeof(*attr), GFP_KERNEL);
>> - if (!attr)
>> - return -ENOMEM;
>> -
>> - attr->qp_state = IB_QPS_INIT;
>> - attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
>> + memset(&attr, 0, sizeof(attr));
>> + attr.qp_state = IB_QPS_INIT;
>> + attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
>> IB_ACCESS_REMOTE_WRITE;
>> - attr->port_num = ch->sport->port;
>> - attr->pkey_index = 0;
>> + attr.port_num = ch->sport->port;
>> + attr.pkey_index = 0;
>
> Correct me if i'm wrong but this looks like redundant since we zeroed the
> entire attr object few lines ago.
>
Yes this is redundant but I think it's implies the flags you'll pass
ib_modify_qp. don't realy mind,
Bart, your call :)
>>
>> - ret = ib_modify_qp(qp, attr,
>> + ret = ib_modify_qp(qp, &attr,
>> IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
>> IB_QP_PKEY_INDEX);
>>
>> - kfree(attr);
>> return ret;
>> }
>>
>> --
>> 1.7.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-2-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:14 ` Yuval Shaia
@ 2016-12-28 11:38 ` Bart Van Assche
1 sibling, 0 replies; 14+ messages in thread
From: Bart Van Assche @ 2016-12-28 11:38 UTC (permalink / raw)
To: maxg-VPRAkNaXOzVWk0Htik3J/w, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w
On Wed, 2016-12-28 at 13:00 +0200, Max Gurtovoy wrote:
> No reason to allocate it dynamically.
The patch description is not correct. The reason struct ib_qp_attr is
allocated on the stack is to keep stack usage low, something that is
important in kernel code.
Bart.
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/3] IB/srpt: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-3-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:06 ` Yuval Shaia
@ 2016-12-28 11:39 ` Bart Van Assche
2016-12-28 12:57 ` Leon Romanovsky
2 siblings, 0 replies; 14+ messages in thread
From: Bart Van Assche @ 2016-12-28 11:39 UTC (permalink / raw)
To: maxg-VPRAkNaXOzVWk0Htik3J/w, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w
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On Wed, 2016-12-28 at 13:00 +0200, Max Gurtovoy wrote:
> No reason to allocate it dynamically.
Same comment here: struct ib_qp_attr is allocated on the stack
to keep stack usage low.
Bart.
N§²æìr¸yúèØb²X¬¶Ç§vØ^)Þº{.nÇ+·¥{±Ù{ayº\x1dÊÚë,j\a¢f£¢·h»öì\x17/oSc¾Ú³9uÀ¦æåÈ&jw¨®\x03(éÝ¢j"ú\x1a¶^[m§ÿïêäz¹Þàþf£¢·h§~m
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 3/3] IB/srpt: fix compilation warning
[not found] ` <1482922813-8392-4-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:18 ` Yuval Shaia
@ 2016-12-28 11:41 ` Bart Van Assche
[not found] ` <1482925264.6713.5.camel-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
1 sibling, 1 reply; 14+ messages in thread
From: Bart Van Assche @ 2016-12-28 11:41 UTC (permalink / raw)
To: maxg-VPRAkNaXOzVWk0Htik3J/w, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w
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On Wed, 2016-12-28 at 13:00 +0200, Max Gurtovoy wrote:
> warning: 'prev_nents' may be used uninitialized in this function
What compiler and which version of that compiler reported that 'prev_nents'
may be used uninitialized? That warning indicates a compiler bug. Recent
versions of gcc do not report that warning. Patches that suppress warnings
that are reported by bugs in old compiler versions should not be sent upstream.
Bart.N§²æìr¸yúèØb²X¬¶Ç§vØ^)Þº{.nÇ+·¥{±Ù{ayº\x1dÊÚë,j\a¢f£¢·h»öì\x17/oSc¾Ú³9uÀ¦æåÈ&jw¨®\x03(éÝ¢j"ú\x1a¶^[m§ÿïêäz¹Þàþf£¢·h§~m
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 3/3] IB/srpt: fix compilation warning
[not found] ` <1482925264.6713.5.camel-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
@ 2016-12-28 11:44 ` Max Gurtovoy
0 siblings, 0 replies; 14+ messages in thread
From: Max Gurtovoy @ 2016-12-28 11:44 UTC (permalink / raw)
To: Bart Van Assche, linux-rdma-u79uwXL29TY76Z2rM5mHXA
Cc: israelr-VPRAkNaXOzVWk0Htik3J/w
On 12/28/2016 1:41 PM, Bart Van Assche wrote:
> On Wed, 2016-12-28 at 13:00 +0200, Max Gurtovoy wrote:
>> warning: 'prev_nents' may be used uninitialized in this function
>
> What compiler and which version of that compiler reported that 'prev_nents'
> may be used uninitialized? That warning indicates a compiler bug. Recent
> versions of gcc do not report that warning. Patches that suppress warnings
> that are reported by bugs in old compiler versions should not be sent upstream.
>
> Bart.
>
gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC)
I'll remove this patch in V2.
Thanks,
Max.
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/3] IB/srpt: allocate ib_qp_attr on the stack
[not found] ` <1482922813-8392-3-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:06 ` Yuval Shaia
2016-12-28 11:39 ` Bart Van Assche
@ 2016-12-28 12:57 ` Leon Romanovsky
2 siblings, 0 replies; 14+ messages in thread
From: Leon Romanovsky @ 2016-12-28 12:57 UTC (permalink / raw)
To: Max Gurtovoy
Cc: bvanassche-HInyCGIudOg, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
israelr-VPRAkNaXOzVWk0Htik3J/w
[-- Attachment #1: Type: text/plain, Size: 1805 bytes --]
On Wed, Dec 28, 2016 at 01:00:12PM +0200, Max Gurtovoy wrote:
> No reason to allocate it dynamically.
>
> Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
> ---
> drivers/infiniband/ulp/srpt/ib_srpt.c | 18 +++++++-----------
> 1 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
> index 0b1f69e..aa18d74 100644
> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
> @@ -984,24 +984,20 @@ static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
> */
> static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
> {
> - struct ib_qp_attr *attr;
> + struct ib_qp_attr attr;
> int ret;
>
> - attr = kzalloc(sizeof(*attr), GFP_KERNEL);
> - if (!attr)
> - return -ENOMEM;
> -
> - attr->qp_state = IB_QPS_INIT;
> - attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
> + memset(&attr, 0, sizeof(attr));
This line will not needed if you initialize to zero this struct attr at the beginning of function.
> + attr.qp_state = IB_QPS_INIT;
> + attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
> IB_ACCESS_REMOTE_WRITE;
> - attr->port_num = ch->sport->port;
> - attr->pkey_index = 0;
> + attr.port_num = ch->sport->port;
> + attr.pkey_index = 0;
>
> - ret = ib_modify_qp(qp, attr,
> + ret = ib_modify_qp(qp, &attr,
> IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
> IB_QP_PKEY_INDEX);
>
> - kfree(attr);
> return ret;
> }
>
> --
> 1.7.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
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end of thread, other threads:[~2016-12-28 12:57 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-28 11:00 [PATCH 0/3] srp/srpt - some useful patches Max Gurtovoy
[not found] ` <1482922813-8392-1-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:00 ` [PATCH 1/3] IB/srp: allocate ib_qp_attr on the stack Max Gurtovoy
[not found] ` <1482922813-8392-2-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:14 ` Yuval Shaia
2016-12-28 11:33 ` Max Gurtovoy
2016-12-28 11:38 ` Bart Van Assche
2016-12-28 11:00 ` [PATCH 2/3] IB/srpt: " Max Gurtovoy
[not found] ` <1482922813-8392-3-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:06 ` Yuval Shaia
2016-12-28 11:38 ` Max Gurtovoy
2016-12-28 11:39 ` Bart Van Assche
2016-12-28 12:57 ` Leon Romanovsky
2016-12-28 11:00 ` [PATCH 3/3] IB/srpt: fix compilation warning Max Gurtovoy
[not found] ` <1482922813-8392-4-git-send-email-maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-12-28 11:18 ` Yuval Shaia
2016-12-28 11:41 ` Bart Van Assche
[not found] ` <1482925264.6713.5.camel-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-12-28 11:44 ` Max Gurtovoy
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