linux-kernel - Re: [PATCH v2] Bluetooth: hci_qca: Add support for controller debug logs.

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Message-Id: <2206464E-FA01-4A5A-8BC4-5CF70A0B9765@holtmann.org>
Date:   Wed, 3 Oct 2018 18:56:45 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        Harish Bandi <c-hbandi@...eaurora.org>
Subject: Re: [PATCH v2] Bluetooth: hci_qca: Add support for controller debug
 logs.

Hi Balakrishna,

> This patch will prevent error messages splashing on console.
> 
> [   78.426697] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
> [   78.436682] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
> [   78.446639] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
> [   78.456596] Bluetooth: hci_core.c:hci_acldata_packet() hci0: ACL packet for unknown connection handle 3804
> 
> QCA wcn3990 will send the debug logs in the form of ACL packets.
> While decoding packet in qca_recv(), marking the received debug log
> packet as diagnostic packet.
> 
> Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> ---
> v2: 
>  * Addressed reviewer comments.
> v1: 
>  * initial patch
> ---
> drivers/bluetooth/hci_qca.c | 20 +++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index d98ed0442201..63ac3c6b4149 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -63,6 +63,10 @@
> /* susclk rate */
> #define SUSCLK_RATE_32KHZ	32768
> 
> +/* Controller debug log header */
> +#define QCA_DEBUG_HDR_MSB	0xDC
> +#define QCA_DEBUG_HDR_LSB	0x2E
> +

since this is actually the ACL handle, why not call it QCA_DEBUG_HANDLE.

> /* HCI_IBS transmit side sleep protocol states */
> enum tx_ibs_states {
> 	HCI_IBS_TX_ASLEEP,
> @@ -849,6 +853,20 @@ static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
> 	return 0;
> }
> 
> +static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
> +{
> +	/* We receive debug logs from chip as an ACL packets.
> +	 * Instead of sending the data to ACL to decode the
> +	 * received data, we are pushing them to the above layers
> +	 * as a diagnostic packet.
> +	 */
> +	if ((skb->len > 2) && (skb->data[0] == QCA_DEBUG_HDR_MSB) &&
> +	    (skb->data[1] == QCA_DEBUG_HDR_LSB))

Skip the individual () since they are not needed. Also the skb->len check is not needed since the H4_RECV_ACL already ensures the proper length of the header.

And just use get_unaligned_le16(skb->data) here (or be16 if that is the byte order).

> +		return hci_recv_diag(hdev, skb);

Is there any reason to keep the 4 octets hci_acl_hdr with this SKB? Or would it be better to be stripped off. Mainly asking are they any other magic handles that we might want to feed through the diag channel?

> +
> +	return hci_recv_frame(hdev, skb);
> +}
> +

Regards

Marcel