netdev - Re: [PATCH net-next] mlx5: Use proper logging and tracing line terminations

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Date:   Tue, 14 Jan 2020 20:30:55 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "joe@...ches.com" <joe@...ches.com>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] mlx5: Use proper logging and tracing line
 terminations

On Sun, 2020-01-12 at 23:30 -0800, Joe Perches wrote:
> netdev_err should use newline termination but mlx5_health_report
> is used in a trace output function devlink_health_report where
> no newline should be used.
> 
> Remove the newlines from a couple formats and add a format string
> of "%s\n" to the netdev_err call to not directly output the
> logging string.
> 
> Also use snprintf to avoid any possible output string overrun.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en/health.c      |  2 +-
>  drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c |  9 +++++-
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c | 10 +++++-
> ----
>  3 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
> b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
> index 3a9756..75a35f1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
> @@ -197,7 +197,7 @@ int mlx5e_health_report(struct mlx5e_priv *priv,
>  			struct devlink_health_reporter *reporter, char
> *err_str,
>  			struct mlx5e_err_ctx *err_ctx)
>  {
> -	netdev_err(priv->netdev, err_str);
> +	netdev_err(priv->netdev, "%s\n", err_str);
>  
>  	if (!reporter)
>  		return err_ctx->recover(&err_ctx->ctx);
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
> b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
> index 6c72b59..67d2f70 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
> @@ -110,7 +110,7 @@ void mlx5e_reporter_icosq_cqe_err(struct
> mlx5e_icosq *icosq)
>  
>  	err_ctx.ctx = icosq;
>  	err_ctx.recover = mlx5e_rx_reporter_err_icosq_cqe_recover;
> -	sprintf(err_str, "ERR CQE on ICOSQ: 0x%x", icosq->sqn);
> +	snprintf(err_str, sizeof(err_str), "ERR CQE on ICOSQ: 0x%x",
> icosq->sqn);
>  
>  	mlx5e_health_report(priv, priv->rx_reporter, err_str,
> &err_ctx);
>  }
> @@ -179,7 +179,7 @@ void mlx5e_reporter_rq_cqe_err(struct mlx5e_rq
> *rq)
>  
>  	err_ctx.ctx = rq;
>  	err_ctx.recover = mlx5e_rx_reporter_err_rq_cqe_recover;
> -	sprintf(err_str, "ERR CQE on RQ: 0x%x", rq->rqn);
> +	snprintf(err_str, sizeof(err_str), "ERR CQE on RQ: 0x%x", rq-
> >rqn);
>  
>  	mlx5e_health_report(priv, priv->rx_reporter, err_str,
> &err_ctx);
>  }
> @@ -210,8 +210,9 @@ void mlx5e_reporter_rx_timeout(struct mlx5e_rq
> *rq)
>  
>  	err_ctx.ctx = rq;
>  	err_ctx.recover = mlx5e_rx_reporter_timeout_recover;
> -	sprintf(err_str, "RX timeout on channel: %d, ICOSQ: 0x%x RQ:
> 0x%x, CQ: 0x%x\n",
> -		icosq->channel->ix, icosq->sqn, rq->rqn, rq-
> >cq.mcq.cqn);
> +	snprintf(err_str, sizeof(err_str),
> +		 "RX timeout on channel: %d, ICOSQ: 0x%x RQ: 0x%x, CQ:
> 0x%x",
> +		 icosq->channel->ix, icosq->sqn, rq->rqn, rq-
> >cq.mcq.cqn);
>  
>  	mlx5e_health_report(priv, priv->rx_reporter, err_str,
> &err_ctx);
>  }
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
> b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
> index b46854..5ecb986 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
> @@ -90,7 +90,7 @@ void mlx5e_reporter_tx_err_cqe(struct mlx5e_txqsq
> *sq)
>  
>  	err_ctx.ctx = sq;
>  	err_ctx.recover = mlx5e_tx_reporter_err_cqe_recover;
> -	sprintf(err_str, "ERR CQE on SQ: 0x%x", sq->sqn);
> +	snprintf(err_str, sizeof(err_str), "ERR CQE on SQ: 0x%x", sq-
> >sqn);
>  
>  	mlx5e_health_report(priv, priv->tx_reporter, err_str,
> &err_ctx);
>  }
> @@ -118,10 +118,10 @@ int mlx5e_reporter_tx_timeout(struct
> mlx5e_txqsq *sq)
>  
>  	err_ctx.ctx = sq;
>  	err_ctx.recover = mlx5e_tx_reporter_timeout_recover;
> -	sprintf(err_str,
> -		"TX timeout on queue: %d, SQ: 0x%x, CQ: 0x%x, SQ Cons:
> 0x%x SQ Prod: 0x%x, usecs since last trans: %u\n",
> -		sq->channel->ix, sq->sqn, sq->cq.mcq.cqn, sq->cc, sq-
> >pc,
> -		jiffies_to_usecs(jiffies - sq->txq->trans_start));
> +	snprintf(err_str, sizeof(err_str),
> +		 "TX timeout on queue: %d, SQ: 0x%x, CQ: 0x%x, SQ Cons:
> 0x%x SQ Prod: 0x%x, usecs since last trans: %u",
> +		 sq->channel->ix, sq->sqn, sq->cq.mcq.cqn, sq->cc, sq-
> >pc,
> +		 jiffies_to_usecs(jiffies - sq->txq->trans_start));
>  
>  	return mlx5e_health_report(priv, priv->tx_reporter, err_str,
> &err_ctx);
>  }
> 
> 
> 

LGTM, Applied to net-next-mlx5.

Thanks,
Saeed.