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Message-ID: <cfeab378a2b226c1c0ba62912d18c5a254de8daa.camel@mendozajonas.com>
Date: Mon, 12 Nov 2018 11:38:52 +1100
From: Samuel Mendoza-Jonas <sam@...dozajonas.com>
To: Justin.Lee1@...l.com, netdev@...r.kernel.org
Cc: davem@...emloft.net, linux-kernel@...r.kernel.org,
openbmc@...ts.ozlabs.org
Subject: Re: [PATCH net-next v3 6/6] net/ncsi: Configure multi-package,
multi-channel modes with failover
On Fri, 2018-11-09 at 21:58 +0000, Justin.Lee1@...l.com wrote:
> 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@...dozajonas.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);
> }
>
> > }
> >
Oops, wrote that patch a little fast it seems. This may also affect the
double-Tx above since ncsi_update_tx_channel() won't be reached.
I've attached a fixed up version below.
For the failover issue you're seeing in your previous email the issue is
likely in the ncsi_dev_state_suspend_gls state. This should send a GLS
command to all available channels, but it only does it for the current
package. Since not all packages are necessarily enabled in single-channel
mode I'll need to have a think about the neatest way to handle that, but
it's a separate issue from this patch.
Cheers,
Sam
>From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Mendoza-Jonas <sam@...dozajonas.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 | 16 ++++++++++------
net/ncsi/ncsi-manage.c | 19 +++++++++++++++----
2 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/net/ncsi/ncsi-aen.c b/net/ncsi/ncsi-aen.c
index 39c2e9eea2ba..76559d0eeea8 100644
--- a/net/ncsi/ncsi-aen.c
+++ b/net/ncsi/ncsi-aen.c
@@ -94,13 +94,17 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
return 0;
if (!ndp->multi_package && !nc->package->multi_channel) {
- if (had_link)
+ if (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);
+ 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;
+ }
}
if (had_link) {
diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index fa3c2144f5ba..92e59f07f9a7 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1063,17 +1063,17 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
case ncsi_dev_state_config_done:
netdev_dbg(ndp->ndev.dev, "NCSI: channel %u config done\n",
nc->id);
+ spin_lock_irqsave(&nc->lock, flags);
+ nc->state = NCSI_CHANNEL_ACTIVE;
+
if (ndp->flags & NCSI_DEV_RESET) {
/* A reset event happened during config, start it now */
- spin_lock_irqsave(&nc->lock, flags);
nc->reconfigure_needed = false;
spin_unlock_irqrestore(&nc->lock, flags);
- nd->state = ncsi_dev_state_functional;
ncsi_reset_dev(nd);
break;
}
- spin_lock_irqsave(&nc->lock, flags);
if (nc->reconfigure_needed) {
/* This channel's configuration has been updated
* part-way during the config state - start the
@@ -1092,7 +1092,6 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
break;
}
- nc->state = NCSI_CHANNEL_ACTIVE;
if (nc->modes[NCSI_MODE_LINK].data[2] & 0x1) {
hot_nc = nc;
} else {
@@ -1803,6 +1802,18 @@ int ncsi_reset_dev(struct ncsi_dev *nd)
spin_unlock_irqrestore(&ndp->lock, flags);
return 0;
}
+ } else {
+ switch (nd->state) {
+ case ncsi_dev_state_suspend_done:
+ case ncsi_dev_state_config_done:
+ case ncsi_dev_state_functional:
+ /* Ok */
+ break;
+ default:
+ /* Current reset operation happening */
+ spin_unlock_irqrestore(&ndp->lock, flags);
+ return 0;
+ }
}
if (!list_empty(&ndp->channel_queue)) {
--
2.19.1
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