netdev - Re: [PATCH net v2] net: wwan: Fix missing net device name for error message print

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Date: Fri, 26 Apr 2024 13:33:04 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Slark Xiao <slark_xiao@....com>
Cc: loic.poulain@...aro.org, ryazanov.s.a@...il.com,
	johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hariprasad Kelam <hkelam@...vell.com>
Subject: Re: [PATCH net v2] net: wwan: Fix missing net device name for error
 message print

Fri, Apr 26, 2024 at 11:24:44AM CEST, slark_xiao@....com wrote:
>In my local, I got an error print in dmesg like below:
>"sequence number glitch prev=487 curr=0"
>After checking, it belongs to mhi_wwan_mbim.c. Refer to the usage
>of this net_err_ratelimited() API in other files, I think we
>should add net device name print before message context.

You don't add dev device name, but rather constant string.

>
>Fixes: aa730a9905b7 ("net: wwan: Add MHI MBIM network driver")
>Signed-off-by: Slark Xiao <slark_xiao@....com>
>Reviewed-by: Hariprasad Kelam <hkelam@...vell.com>
>---
> drivers/net/wwan/mhi_wwan_mbim.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
>diff --git a/drivers/net/wwan/mhi_wwan_mbim.c b/drivers/net/wwan/mhi_wwan_mbim.c
>index 3f72ae943b29..6cefee25efc4 100644
>--- a/drivers/net/wwan/mhi_wwan_mbim.c
>+++ b/drivers/net/wwan/mhi_wwan_mbim.c
>@@ -186,14 +186,14 @@ static int mbim_rx_verify_nth16(struct mhi_mbim_context *mbim, struct sk_buff *s
> 
> 	if (skb->len < sizeof(struct usb_cdc_ncm_nth16) +
> 			sizeof(struct usb_cdc_ncm_ndp16)) {
>-		net_err_ratelimited("frame too short\n");
>+		net_err_ratelimited("mbim: frame too short\n");

Does not make any sense. If you have multiple instances of mbim, you are
still clueless. You can access netdevice, print out the name as other
net_err_ratelimited() instances do. Btw, it would be more correct to use
netdev_err(), but there is no "ratelimited" variant of that. Perhaps
better to introduce it.

pw-bot: cr


> 		return -EINVAL;
> 	}
> 
> 	nth16 = (struct usb_cdc_ncm_nth16 *)skb->data;
> 
> 	if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
>-		net_err_ratelimited("invalid NTH16 signature <%#010x>\n",
>+		net_err_ratelimited("mbim: invalid NTH16 signature <%#010x>\n",
> 				    le32_to_cpu(nth16->dwSignature));
> 		return -EINVAL;
> 	}
>@@ -201,7 +201,7 @@ static int mbim_rx_verify_nth16(struct mhi_mbim_context *mbim, struct sk_buff *s
> 	/* No limit on the block length, except the size of the data pkt */
> 	len = le16_to_cpu(nth16->wBlockLength);
> 	if (len > skb->len) {
>-		net_err_ratelimited("NTB does not fit into the skb %u/%u\n",
>+		net_err_ratelimited("mbim: NTB does not fit into the skb %u/%u\n",
> 				    len, skb->len);
> 		return -EINVAL;
> 	}
>@@ -209,7 +209,7 @@ static int mbim_rx_verify_nth16(struct mhi_mbim_context *mbim, struct sk_buff *s
> 	if (mbim->rx_seq + 1 != le16_to_cpu(nth16->wSequence) &&
> 	    (mbim->rx_seq || le16_to_cpu(nth16->wSequence)) &&
> 	    !(mbim->rx_seq == 0xffff && !le16_to_cpu(nth16->wSequence))) {
>-		net_err_ratelimited("sequence number glitch prev=%d curr=%d\n",
>+		net_err_ratelimited("mbim: sequence number glitch prev=%d curr=%d\n",
> 				    mbim->rx_seq, le16_to_cpu(nth16->wSequence));
> 	}
> 	mbim->rx_seq = le16_to_cpu(nth16->wSequence);
>@@ -222,7 +222,7 @@ static int mbim_rx_verify_ndp16(struct sk_buff *skb, struct usb_cdc_ncm_ndp16 *n
> 	int ret;
> 
> 	if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
>-		net_err_ratelimited("invalid DPT16 length <%u>\n",
>+		net_err_ratelimited("mbim: invalid DPT16 length <%u>\n",
> 				    le16_to_cpu(ndp16->wLength));
> 		return -EINVAL;
> 	}
>@@ -233,7 +233,7 @@ static int mbim_rx_verify_ndp16(struct sk_buff *skb, struct usb_cdc_ncm_ndp16 *n
> 
> 	if (sizeof(struct usb_cdc_ncm_ndp16) +
> 	     ret * sizeof(struct usb_cdc_ncm_dpe16) > skb->len) {
>-		net_err_ratelimited("Invalid nframes = %d\n", ret);
>+		net_err_ratelimited("mbim: Invalid nframes = %d\n", ret);
> 		return -EINVAL;
> 	}
> 
>-- 
>2.25.1
>
>