RE: [PATCH net-next v3 6/6] net/ncsi: Configure multi-package, multi-channel modes with failover

[<Justin.Lee1@Dell.com>]

Hi Samuel,

After running more testing, I notice that the extra patch causing failover function
to fail. Also, occasionally, I will see two channels having TX enabled if I
send netlink command back-to-back.

cat /sys/kernel/debug/ncsi_protocol/ncsi_device_
IFIDX IFNAME NAME   PID CID RX TX MP MC WP WC PC CS PS LS RU CR NQ HA
=====================================================================
  2   eth2   ncsi0  000 000 1  1  1  1  1  1  1  2  1  1  1  1  0  1
  2   eth2   ncsi1  000 001 1  1  1  1  1  1  0  2  1  1  1  1  0  1
  2   eth2   ncsi2  001 000 0  0  1  1  0  0  0  1  0  1  1  1  0  1
  2   eth2   ncsi3  001 001 0  0  1  1  0  0  0  1  0  1  1  1  0  1
=====================================================================
MP: Multi-mode Package  WP: Whitelist Package
MC: Multi-mode Channel  WC: Whitelist Channel
PC: Primary Channel     CS: Channel State IA/A/IV 1/2/3
PS: Poll Status         LS: Link Status
RU: Running             CR: Carrier OK
NQ: Queue Stopped       HA: Hardware Arbitration

Thanks,
Justin


> From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
> From: Samuel Mendoza-Jonas <sam@mendozajonas.com>
> Date: Fri, 9 Nov 2018 13:11:03 +1100
> Subject: [PATCH] net/ncsi: Reset state fixes, single-channel LSC
> 
> ---
>  net/ncsi/ncsi-aen.c    |  8 +++++---
>  net/ncsi/ncsi-manage.c | 19 +++++++++++++++----
>  2 files changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c
> index 39c2e9eea2ba..034cb1dc5566 100644
> --- a/net/ncsi/ncsi-aen.c
> +++ b/net/ncsi/ncsi-aen.c
> @@ -93,14 +93,16 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
>  	if ((had_link == has_link) || chained)
>  		return 0;
>  
> -	if (!ndp->multi_package && !nc->package->multi_channel) {
> -		if (had_link)
> -			ndp->flags |= NCSI_DEV_RESHUFFLE;
> +	if (!ndp->multi_package && !nc->package->multi_channel && had_link) {
> +		ndp->flags |= NCSI_DEV_RESHUFFLE;
>  		ncsi_stop_channel_monitor(nc);
>  		spin_lock_irqsave(&ndp->lock, flags);
>  		list_add_tail_rcu(&nc->link, &ndp->channel_queue);
>  		spin_unlock_irqrestore(&ndp->lock, flags);
>  		return ncsi_process_next_channel(ndp);
> +	} else {
> +		/* Configured channel came up */
> +		return 0;

It is always going to else statement if multi_package and/or mutlit_channel is enabled.
 
npcm7xx-emc f0825000.eth eth2: NCSI: ncsi_aen_handler_lsc() - pkg 0 ch 0 state down
npcm7xx-emc f0825000.eth eth2: NCSI: ncsi_aen_handler_lsc() - had_link 1, has_link 0, chained 0

These codes have no chance to run.
	if (had_link) {
		ncm = &nc->modes[NCSI_MODE_TX_ENABLE];
		if (ncsi_channel_is_last(ndp, nc)) {
			/* No channels left, reconfigure */
			return ncsi_reset_dev(&ndp->ndev);
		} else if (ncm->enable) {
			/* Need to failover Tx channel */
			ncsi_update_tx_channel(ndp, nc->package, nc, NULL);
		}

>  	}
>