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nfp: track link state changes 

For caching link settings - remember if we have seen link events
since the last time the eth_port information was refreshed.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-04-04 16:12:25 -07:00 committed by David S. Miller
parent d12537df34
commit cee4295133
2 changed files with 19 additions and 1 deletions
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6
drivers/net/ethernet/netronome/nfp/nfp_net.h
View File

@ -523,7 +523,8 @@ struct nfp_net_dp {
* @reconfig_sync_present: Some thread is performing synchronous reconfig
* @reconfig_timer: Timer for async reading of reconfig results
* @link_up: Is the link up?
* @link_status_lock: Protects @link_up and ensures atomicity with BAR reading
* @link_changed: Has link state changes since last port refresh?
* @link_status_lock: Protects @link_* and ensures atomicity with BAR reading
* @rx_coalesce_usecs: RX interrupt moderation usecs delay parameter
* @rx_coalesce_max_frames: RX interrupt moderation frame count parameter
* @tx_coalesce_usecs: TX interrupt moderation usecs delay parameter
@ -580,6 +581,7 @@ struct nfp_net {
u32 me_freq_mhz;
bool link_up;
bool link_changed;
spinlock_t link_status_lock;
spinlock_t reconfig_lock;
@ -810,6 +812,8 @@ nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn);
int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *new);
bool nfp_net_link_changed_read_clear(struct nfp_net *nn);
#ifdef CONFIG_NFP_DEBUG
void nfp_net_debugfs_create(void);
void nfp_net_debugfs_destroy(void);

14
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -376,6 +376,19 @@ static irqreturn_t nfp_net_irq_rxtx(int irq, void *data)
return IRQ_HANDLED;
}
bool nfp_net_link_changed_read_clear(struct nfp_net *nn)
{
unsigned long flags;
bool ret;
spin_lock_irqsave(&nn->link_status_lock, flags);
ret = nn->link_changed;
nn->link_changed = false;
spin_unlock_irqrestore(&nn->link_status_lock, flags);
return ret;
}
/**
* nfp_net_read_link_status() - Reread link status from control BAR
* @nn: NFP Network structure
@ -395,6 +408,7 @@ static void nfp_net_read_link_status(struct nfp_net *nn)
goto out;
nn->link_up = link_up;
nn->link_changed = true;
if (nn->link_up) {
netif_carrier_on(nn->dp.netdev);