Re: [PATCH 03/20] net: xilinx: tsn: add endpoint MAC driver skeleton

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Medium] Dropped packets are freed using `dev_kfree_skb()`, which aliases to `consume_skb()` and incorrectly signals successful transmission to tracepoints.
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--- Patch [3]: [PATCH 03/20] net: xilinx: tsn: add endpoint MAC driver skeleton ---
commit 3acdda66dd5bb6201672edaed64d428e5efb7890
Author: Srinivas Neeli <srinivas.neeli@amd.com>

net: xilinx: tsn: add endpoint MAC driver skeleton

This commit adds a platform driver skeleton for the TSN Endpoint MAC. It
registers the netdev, sets the MAC address, and provides minimal operations
for device bring-up, intentionally dropping frames on transmit since there
is no data path yet.

[ ... ]
> diff --git a/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c
> new file mode 100644
> index 0000000000000..9b556edf54237
> --- /dev/null
> +++ b/drivers/net/ethernet/xilinx/tsn/xilinx_tsn_ep.c
[ ... ]
> +static netdev_tx_t ep_start_xmit(struct sk_buff *skb, struct net_device *ndev)
> +{
> +	dev_kfree_skb(skb);
> +	DEV_STATS_INC(ndev, tx_dropped);
> +	return NETDEV_TX_OK;
> +}

[Severity: Medium]
Since ep_start_xmit() intentionally drops the packet, should it use
kfree_skb() or dev_kfree_skb_any() instead of dev_kfree_skb()?

dev_kfree_skb() aliases to consume_skb(), which triggers the 'consume'
tracepoints used for successfully transmitted packets. Calling it here
prevents network diagnostic tools (such as dropwatch) from properly
recording these packets as dropped.

[ ... ]

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Sashiko AI review · https://sashiko.dev/#/patchset/20260807104431.157230-1-nagadheeraj.rottela@amd.com?part=3