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net/ncsi: Don't enable all channels when HWA available 

NCSI hardware arbitration allows multiple packages to be enabled at once
and share the same wiring. If the NCSI driver recognises that HWA is
available it unconditionally enables all packages and channels; but that
is a configuration decision rather than something required by HWA.
Additionally the current implementation will not failover on link events
which can cause connectivity to be lost unless the interface is manually
bounced.

Retain basic HWA support but remove the separate configuration path to
enable all channels, leaving this to be handled by a later
implementation.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Samuel Mendoza-Jonas 2018-11-16 15:51:54 +11:00 committed by David S. Miller
parent 2391b0030e
commit 60ab49bfe4
2 changed files with 5 additions and 48 deletions
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3
net/ncsi/ncsi-aen.c
View File

@ -86,8 +86,7 @@ static int ncsi_aen_handler_lsc(struct ncsi_dev_priv *ndp,
!(state == NCSI_CHANNEL_ACTIVE && !(data & 0x1)))
return 0;
if (!(ndp->flags & NCSI_DEV_HWA) &&
state == NCSI_CHANNEL_ACTIVE)
if (state == NCSI_CHANNEL_ACTIVE)
ndp->flags |= NCSI_DEV_RESHUFFLE;
ncsi_stop_channel_monitor(nc);

44
net/ncsi/ncsi-manage.c
View File

@ -113,10 +113,8 @@ static void ncsi_channel_monitor(struct timer_list *t)
default:
netdev_err(ndp->ndev.dev, "NCSI Channel %d timed out!\n",
nc->id);
if (!(ndp->flags & NCSI_DEV_HWA)) {
ncsi_report_link(ndp, true);
ndp->flags |= NCSI_DEV_RESHUFFLE;
}
ncsi_stop_channel_monitor(nc);
@ -1050,35 +1048,6 @@ static bool ncsi_check_hwa(struct ncsi_dev_priv *ndp)
return false;
}
static int ncsi_enable_hwa(struct ncsi_dev_priv *ndp)
{
struct ncsi_package *np;
struct ncsi_channel *nc;
unsigned long flags;
/* Move all available channels to processing queue */
spin_lock_irqsave(&ndp->lock, flags);
NCSI_FOR_EACH_PACKAGE(ndp, np) {
NCSI_FOR_EACH_CHANNEL(np, nc) {
WARN_ON_ONCE(nc->state != NCSI_CHANNEL_INACTIVE ||
!list_empty(&nc->link));
ncsi_stop_channel_monitor(nc);
list_add_tail_rcu(&nc->link, &ndp->channel_queue);
}
}
spin_unlock_irqrestore(&ndp->lock, flags);
/* We can have no channels in extremely case */
if (list_empty(&ndp->channel_queue)) {
netdev_err(ndp->ndev.dev,
"NCSI: No available channels for HWA\n");
ncsi_report_link(ndp, false);
return -ENOENT;
}
return ncsi_process_next_channel(ndp);
}
static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
{
struct ncsi_dev *nd = &ndp->ndev;
@ -1156,9 +1125,6 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
*/
if (!ndp->active_package) {
ndp->flags |= NCSI_DEV_PROBED;
if (ncsi_check_hwa(ndp))
ncsi_enable_hwa(ndp);
else
ncsi_choose_active_channel(ndp);
return;
}
@ -1592,7 +1558,6 @@ EXPORT_SYMBOL_GPL(ncsi_register_dev);
int ncsi_start_dev(struct ncsi_dev *nd)
{
struct ncsi_dev_priv *ndp = TO_NCSI_DEV_PRIV(nd);
int ret;
if (nd->state != ncsi_dev_state_registered &&
nd->state != ncsi_dev_state_functional)
@ -1604,14 +1569,7 @@ int ncsi_start_dev(struct ncsi_dev *nd)
return 0;
}
if (ndp->flags & NCSI_DEV_HWA) {
netdev_info(ndp->ndev.dev, "NCSI: Enabling HWA mode\n");
ret = ncsi_enable_hwa(ndp);
} else {
ret = ncsi_choose_active_channel(ndp);
}
return ret;
return ncsi_choose_active_channel(ndp);
}
EXPORT_SYMBOL_GPL(ncsi_start_dev);