[dpdk-dev] [PATCH] net/mlx5: fix use of atomic cmpset for age state
Raslan Darawsheh
rasland at nvidia.com
Mon Oct 19 12:48:43 CEST 2020
Hi,
> -----Original Message-----
> From: dev <dev-bounces at dpdk.org> On Behalf Of Dekel Peled
> Sent: Thursday, October 15, 2020 2:44 PM
> To: Matan Azrad <matan at nvidia.com>; Shahaf Shuler
> <shahafs at nvidia.com>; Slava Ovsiienko <viacheslavo at nvidia.com>
> Cc: dev at dpdk.org; stable at dpdk.org
> Subject: [dpdk-dev] [PATCH] net/mlx5: fix use of atomic cmpset for age state
>
> According to documentation [1], function rte_atomic16_cmpset()
> return value is non-zero on success; 0 on failure.
> In existing code this function is called, and the return value
> is compared to AGE_CANDIDATE, which is defined as 1.
> Such comparison is incorrect and can lead to unwanted behavior.
>
> This patch updates the calls to rte_atomic16_cmpset(), to check
> that the return value is 0 or non-zero.
>
> [1]
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdoc.
> dpdk.org%2Fapi%2Frte__atomic_8h.html&data=04%7C01%7Crasland%
> 40nvidia.com%7Cc92848ff1c4a42b83bfb08d870ffe9d0%7C43083d15727340c1b
> 7db39efd9ccc17a%7C0%7C0%7C637383591730997946%7CUnknown%7CTWFp
> bGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVC
> I6Mn0%3D%7C1000&sdata=l%2Bq5%2F8MO4Qrh8MrJzEGrrQCTzE%2FH
> 5Iw03qqXj5LG2PY%3D&reserved=0
>
> Fixes: fa2d01c87d2b ("net/mlx5: support flow aging")
> Cc: stable at dpdk.org
>
> Signed-off-by: Dekel Peled <dekelp at nvidia.com>
> Acked-by: Matan Azrad <matan at nvidia.com>
> ---
> drivers/net/mlx5/mlx5_flow.c | 8 ++------
> drivers/net/mlx5/mlx5_flow_dv.c | 9 ++++-----
> 2 files changed, 6 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index 3d38e11..2729629 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -6747,12 +6747,8 @@ struct mlx5_meter_domains_infos *
> priv = rte_eth_devices[age_param->port_id].data-
> >dev_private;
> age_info = GET_PORT_AGE_INFO(priv);
> rte_spinlock_lock(&age_info->aged_sl);
> - /* If the cpmset fails, release happens. */
> - if (rte_atomic16_cmpset((volatile uint16_t *)
> - &age_param->state,
> - AGE_CANDIDATE,
> - AGE_TMOUT) ==
> - AGE_CANDIDATE) {
> + if (rte_atomic16_cmpset((volatile uint16_t *)&age_param-
> >state,
> + AGE_CANDIDATE, AGE_TMOUT)) {
> TAILQ_INSERT_TAIL(&age_info->aged_counters, cnt,
> next);
> MLX5_AGE_SET(age_info, MLX5_AGE_EVENT_NEW);
> }
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c
> index 361c32d..174189a 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -5103,10 +5103,8 @@ struct field_modify_info modify_tcp[] = {
>
> age_info = GET_PORT_AGE_INFO(priv);
> age_param = flow_dv_counter_idx_get_age(dev, counter);
> - if (rte_atomic16_cmpset((volatile uint16_t *)
> - &age_param->state,
> - AGE_CANDIDATE, AGE_FREE)
> - != AGE_CANDIDATE) {
> + if (!rte_atomic16_cmpset((volatile uint16_t *)&age_param->state,
> + AGE_CANDIDATE, AGE_FREE)) {
> /**
> * We need the lock even it is age timeout,
> * since counter may still in process.
> @@ -5114,9 +5112,10 @@ struct field_modify_info modify_tcp[] = {
> rte_spinlock_lock(&age_info->aged_sl);
> TAILQ_REMOVE(&age_info->aged_counters, cnt, next);
> rte_spinlock_unlock(&age_info->aged_sl);
> + rte_atomic16_set(&age_param->state, AGE_FREE);
> }
> - rte_atomic16_set(&age_param->state, AGE_FREE);
> }
> +
> /**
> * Release a flow counter.
> *
> --
> 1.8.3.1
Patch applied to next-net-mlx,
Kindest regards,
Raslan Darawsheh
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