Messages in this thread Patch in this message | | | Date | Fri, 20 Oct 2006 15:35:09 -0700 | From | Stephen Hemminger <> | Subject | [PATCH 3/3] netpoll: retry logic cleanup |
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Change retry logic of netpoll. Always requeue if unable to send instead of dropping. Make retry counter per send rather than causing mass migration when tries gets less than zero. Since callers are either netpoll_send_arp or netpoll_send_udp, we knwo that np and np->dev can't be null.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
--- netpoll.orig/include/linux/netpoll.h +++ netpoll/include/linux/netpoll.h @@ -27,7 +27,6 @@ struct netpoll { struct netpoll_info { spinlock_t poll_lock; int poll_owner; - int tries; int rx_flags; spinlock_t rx_lock; struct netpoll *rx_np; /* netpoll that registered an rx_hook */ --- netpoll.orig/net/core/netpoll.c +++ netpoll/net/core/netpoll.c @@ -232,50 +232,43 @@ static struct sk_buff * find_skb(struct static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) { - int status; - struct netpoll_info *npinfo; - - if (!np || !np->dev || !netif_running(np->dev)) - goto free_skb; + struct net_device *dev = np->dev; + struct netpoll_info *npinfo = dev->npinfo; + int status, tries; - npinfo = np->dev->npinfo; + if (!netif_running(dev) || !netif_device_present(dev)) + __kfree_skb(skb); /* avoid recursion */ if (npinfo->poll_owner == smp_processor_id() || - np->dev->xmit_lock_owner == smp_processor_id()) { - if (np->drop) - np->drop(skb); - else - __kfree_skb(skb); - return; - } - - do { - npinfo->tries--; - netif_tx_lock(np->dev); + dev->xmit_lock_owner == smp_processor_id()) + goto busy; + for (tries = MAX_RETRIES; tries; --tries) { /* * network drivers do not expect to be called if the queue is * stopped. */ - status = NETDEV_TX_BUSY; - if (!netif_queue_stopped(np->dev)) - status = np->dev->hard_start_xmit(skb, np->dev); - - netif_tx_unlock(np->dev); + if (netif_queue_stopped(dev)) + status = NETDEV_TX_BUSY; + else + status = dev->hard_start_xmit(skb, dev); + netif_tx_unlock(dev); /* success */ - if(!status) { - npinfo->tries = MAX_RETRIES; /* reset */ + if(status == NETDEV_TX_OK) return; - } /* transmit busy */ netpoll_poll(np); udelay(50); - } while (npinfo->tries > 0); -free_skb: - __kfree_skb(skb); + } + +busy: + if (np->drop) + np->drop(skb); + else + __kfree_skb(skb); } void netpoll_send_udp(struct netpoll *np, const char *msg, int len) @@ -628,7 +621,7 @@ int netpoll_setup(struct netpoll *np) npinfo->rx_np = NULL; spin_lock_init(&npinfo->poll_lock); npinfo->poll_owner = -1; - npinfo->tries = MAX_RETRIES; + spin_lock_init(&npinfo->rx_lock); skb_queue_head_init(&npinfo->arp_tx); } else - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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