netdev - Re: [PATCH net-next v6 3/8] net/funeth: probing and netdev ops

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Date:   Wed, 12 Jan 2022 14:45:50 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dimitris Michailidis <d.michailidis@...gible.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, andrew@...n.ch
Subject: Re: [PATCH net-next v6 3/8] net/funeth: probing and netdev ops

On Sun,  9 Jan 2022 17:56:31 -0800 Dimitris Michailidis wrote:
> +static void fun_update_link_state(const struct fun_ethdev *ed,
> +				  const struct fun_admin_port_notif *notif)
> +{
> +	unsigned int port_idx = be16_to_cpu(notif->id);
> +	struct net_device *netdev;
> +	struct funeth_priv *fp;
> +
> +	if (port_idx >= ed->num_ports)
> +		return;
> +
> +	netdev = ed->netdevs[port_idx];
> +	fp = netdev_priv(netdev);
> +
> +	write_seqcount_begin(&fp->link_seq);
> +	fp->link_speed = be32_to_cpu(notif->speed) * 10;  /* 10 Mbps->Mbps */
> +	fp->active_fc = notif->flow_ctrl;
> +	fp->active_fec = notif->fec;
> +	fp->xcvr_type = notif->xcvr_type;
> +	fp->link_down_reason = notif->link_down_reason;
> +	fp->lp_advertising = be64_to_cpu(notif->lp_advertising);
> +
> +	if ((notif->link_state | notif->missed_events) & FUN_PORT_FLAG_MAC_DOWN)
> +		netif_carrier_off(netdev);
> +	if (notif->link_state & FUN_PORT_FLAG_MAC_UP)
> +		netif_carrier_on(netdev);
> +
> +	write_seqcount_end(&fp->link_seq);
> +	fun_report_link(netdev);
> +}
> +
> +/* handler for async events delivered through the admin CQ */
> +static void fun_event_cb(struct fun_dev *fdev, void *entry)
> +{
> +	u8 op = ((struct fun_admin_rsp_common *)entry)->op;
> +
> +	if (op == FUN_ADMIN_OP_PORT) {
> +		const struct fun_admin_port_notif *rsp = entry;
> +
> +		if (rsp->subop == FUN_ADMIN_SUBOP_NOTIFY) {
> +			fun_update_link_state(to_fun_ethdev(fdev), rsp);

Is there locking between service task and admin queue events?