netdev - Re: [Intel-wired-lan] [PATCH] igc: return an error if the mac type is unknown in igc_ptp_systim_to

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Date:   Wed, 18 Jan 2023 07:24:30 +0200
From:   "Neftin, Sasha" <sasha.neftin@...el.com>
To:     Tom Rix <trix@...hat.com>, <jesse.brandeburg@...el.com>,
        <anthony.l.nguyen@...el.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <richardcochran@...il.com>, <nathan@...nel.org>,
        <ndesaulniers@...gle.com>, <vinicius.gomes@...el.com>,
        <jeffrey.t.kirsher@...el.com>
CC:     <netdev@...r.kernel.org>, <llvm@...ts.linux.dev>,
        <intel-wired-lan@...ts.osuosl.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH] igc: return an error if the mac type is
 unknown in igc_ptp_systim_to_hwtstamp()

On 1/14/2023 16:04, Tom Rix wrote:
> clang static analysis reports
> drivers/net/ethernet/intel/igc/igc_ptp.c:673:3: warning: The left operand of
>    '+' is a garbage value [core.UndefinedBinaryOperatorResult]
>     ktime_add_ns(shhwtstamps.hwtstamp, adjust);
>     ^            ~~~~~~~~~~~~~~~~~~~~
> 
> igc_ptp_systim_to_hwtstamp() silently returns without setting the hwtstamp
> if the mac type is unknown.  This should be treated as an error.
> 
> Fixes: 81b055205e8b ("igc: Add support for RX timestamping")
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_ptp.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c
> index c34734d432e0..4e10ced736db 100644
> --- a/drivers/net/ethernet/intel/igc/igc_ptp.c
> +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c
> @@ -417,10 +417,12 @@ static int igc_ptp_verify_pin(struct ptp_clock_info *ptp, unsigned int pin,
>    *
>    * We need to convert the system time value stored in the RX/TXSTMP registers
>    * into a hwtstamp which can be used by the upper level timestamping functions.
> + *
> + * Returns 0 on success.
>    **/
> -static void igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
> -				       struct skb_shared_hwtstamps *hwtstamps,
> -				       u64 systim)
> +static int igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
> +				      struct skb_shared_hwtstamps *hwtstamps,
> +				      u64 systim)
>   {
>   	switch (adapter->hw.mac.type) {
>   	case igc_i225:
> @@ -430,8 +432,9 @@ static void igc_ptp_systim_to_hwtstamp(struct igc_adapter *adapter,
>   						systim & 0xFFFFFFFF);
>   		break;
>   	default:
> -		break;
> +		return -EINVAL;
>   	}
> +	return 0;
>   }
>   
>   /**
> @@ -652,7 +655,8 @@ static void igc_ptp_tx_hwtstamp(struct igc_adapter *adapter)
>   
>   	regval = rd32(IGC_TXSTMPL);
>   	regval |= (u64)rd32(IGC_TXSTMPH) << 32;
> -	igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval);
> +	if (igc_ptp_systim_to_hwtstamp(adapter, &shhwtstamps, regval))
> +		return;
>   
>   	switch (adapter->link_speed) {
>   	case SPEED_10:
Acked-by: Sasha Neftin <sasha.neftin@...el.com>