diff mbox series

timer: allow first subsystem init from secondary

Message ID 1557353861-31997-1-git-send-email-erik.g.carrillo@intel.com (mailing list archive)
State Superseded, archived
Headers
Series timer: allow first subsystem init from secondary |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/mellanox-Performance-Testing success Performance Testing PASS
ci/intel-Performance-Testing success Performance Testing PASS
ci/Intel-compilation success Compilation OK

Commit Message

Carrillo, Erik G May 8, 2019, 10:17 p.m. UTC 
  Since memzones can be reserved from secondary processes as well as
primary processes, if the first call to the timer subsystem init
function occurs in a secondary process, we should allow it to succeed.

Fixes: c0749f7096c7 ("timer: allow management in shared memory")

Signed-off-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
---
 lib/librte_timer/rte_timer.c | 52 +++++++++++++++++++++++---------------------
 1 file changed, 27 insertions(+), 25 deletions(-)

Comments

Burakov, Anatoly May 9, 2019, 11:44 a.m. UTC | #1 
On 08-May-19 11:17 PM, Erik Gabriel Carrillo wrote:
> Since memzones can be reserved from secondary processes as well as
> primary processes, if the first call to the timer subsystem init
> function occurs in a secondary process, we should allow it to succeed.
> 
> Fixes: c0749f7096c7 ("timer: allow management in shared memory")
> 
> Signed-off-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>
> ---
>   lib/librte_timer/rte_timer.c | 52 +++++++++++++++++++++++---------------------
>   1 file changed, 27 insertions(+), 25 deletions(-)
> 
> diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
> index 9f2e921..c0f5b87 100644
> --- a/lib/librte_timer/rte_timer.c
> +++ b/lib/librte_timer/rte_timer.c
> @@ -25,6 +25,7 @@
>   #include <rte_memzone.h>
>   #include <rte_malloc.h>
>   #include <rte_compat.h>
> +#include <rte_errno.h>
>   
>   #include "rte_timer.h"
>   
> @@ -155,40 +156,41 @@ rte_timer_subsystem_init_v1905(void)
>   	struct rte_timer_data *data;
>   	int i, lcore_id;
>   	static const char *mz_name = "rte_timer_mz";
> +	const size_t data_arr_size =
> +				RTE_MAX_DATA_ELS * sizeof(*rte_timer_data_arr);
> +	bool do_full_init;
>   
>   	if (rte_timer_subsystem_initialized)
>   		return -EALREADY;
>   
> -	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
> -		mz = rte_memzone_lookup(mz_name);
> -		if (mz == NULL)
> -			return -EEXIST;
> +lookup:
> +	mz = rte_memzone_lookup(mz_name);

Wouldn't it be better to attempt to reserve outright, and then do a 
lookup on EEXIST?

> +	if (mz == NULL) {
> +		mz = rte_memzone_reserve_aligned(mz_name, data_arr_size,
> +				SOCKET_ID_ANY, 0, RTE_CACHE_LINE_SIZE);
> +		if (mz == NULL) {
> +			if (rte_errno == EEXIST)
> +				goto lookup;
>
Carrillo, Erik G May 9, 2019, 7:47 p.m. UTC | #2 
<...snipped...>

> >
> > @@ -155,40 +156,41 @@ rte_timer_subsystem_init_v1905(void)
> >   	struct rte_timer_data *data;
> >   	int i, lcore_id;
> >   	static const char *mz_name = "rte_timer_mz";
> > +	const size_t data_arr_size =
> > +				RTE_MAX_DATA_ELS *
> sizeof(*rte_timer_data_arr);
> > +	bool do_full_init;
> >
> >   	if (rte_timer_subsystem_initialized)
> >   		return -EALREADY;
> >
> > -	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
> > -		mz = rte_memzone_lookup(mz_name);
> > -		if (mz == NULL)
> > -			return -EEXIST;
> > +lookup:
> > +	mz = rte_memzone_lookup(mz_name);
> 
> Wouldn't it be better to attempt to reserve outright, and then do a lookup on
> EEXIST?

It's probably the expected order;  I've made the change and submitted v2.

Thanks for the review,
Erik

> 
> > +	if (mz == NULL) {
> > +		mz = rte_memzone_reserve_aligned(mz_name,
> data_arr_size,
> > +				SOCKET_ID_ANY, 0, RTE_CACHE_LINE_SIZE);
> > +		if (mz == NULL) {
> > +			if (rte_errno == EEXIST)
> > +				goto lookup;
> >
> 
> 
> --
> Thanks,
> Anatoly
diff mbox series

Patch

diff --git a/lib/librte_timer/rte_timer.c b/lib/librte_timer/rte_timer.c
index 9f2e921..c0f5b87 100644
--- a/lib/librte_timer/rte_timer.c
+++ b/lib/librte_timer/rte_timer.c
@@ -25,6 +25,7 @@ 
 #include <rte_memzone.h>
 #include <rte_malloc.h>
 #include <rte_compat.h>
+#include <rte_errno.h>
 
 #include "rte_timer.h"
 
@@ -155,40 +156,41 @@  rte_timer_subsystem_init_v1905(void)
 	struct rte_timer_data *data;
 	int i, lcore_id;
 	static const char *mz_name = "rte_timer_mz";
+	const size_t data_arr_size =
+				RTE_MAX_DATA_ELS * sizeof(*rte_timer_data_arr);
+	bool do_full_init;
 
 	if (rte_timer_subsystem_initialized)
 		return -EALREADY;
 
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
-		mz = rte_memzone_lookup(mz_name);
-		if (mz == NULL)
-			return -EEXIST;
+lookup:
+	mz = rte_memzone_lookup(mz_name);
+	if (mz == NULL) {
+		mz = rte_memzone_reserve_aligned(mz_name, data_arr_size,
+				SOCKET_ID_ANY, 0, RTE_CACHE_LINE_SIZE);
+		if (mz == NULL) {
+			if (rte_errno == EEXIST)
+				goto lookup;
 
-		rte_timer_data_arr = mz->addr;
-
-		rte_timer_data_arr[default_data_id].internal_flags |=
-			FL_ALLOCATED;
-
-		rte_timer_subsystem_initialized = 1;
+			return -ENOMEM;
+		}
 
-		return 0;
+		do_full_init = true;
 	}
 
-	mz = rte_memzone_reserve_aligned(mz_name,
-			RTE_MAX_DATA_ELS * sizeof(*rte_timer_data_arr),
-			SOCKET_ID_ANY, 0, RTE_CACHE_LINE_SIZE);
-	if (mz == NULL)
-		return -ENOMEM;
-
 	rte_timer_data_arr = mz->addr;
 
-	for (i = 0; i < RTE_MAX_DATA_ELS; i++) {
-		data = &rte_timer_data_arr[i];
+	if (do_full_init) {
+		for (i = 0; i < RTE_MAX_DATA_ELS; i++) {
+			data = &rte_timer_data_arr[i];
 
-		for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
-			rte_spinlock_init(
-				&data->priv_timer[lcore_id].list_lock);
-			data->priv_timer[lcore_id].prev_lcore = lcore_id;
+			for (lcore_id = 0; lcore_id < RTE_MAX_LCORE;
+			     lcore_id++) {
+				rte_spinlock_init(
+					&data->priv_timer[lcore_id].list_lock);
+				data->priv_timer[lcore_id].prev_lcore =
+					lcore_id;
+			}
 		}
 	}
 
@@ -205,8 +207,8 @@  BIND_DEFAULT_SYMBOL(rte_timer_subsystem_init, _v1905, 19.05);
 void __rte_experimental
 rte_timer_subsystem_finalize(void)
 {
-	if (rte_timer_data_arr)
-		rte_free(rte_timer_data_arr);
+	if (!rte_timer_subsystem_initialized)
+		return;
 
 	rte_timer_subsystem_initialized = 0;
 }