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authorStephen Hemminger <shemminger@linux-foundation.org>2007-10-03 16:41:36 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:47:45 -0700
commitbea3348eef27e6044b6161fd04c3152215f96411 (patch)
treef0990b263e5ce42505d290a4c346fe990bcd4c33 /drivers/net/spider_net.c
parentdde4e47e8fe333a5649a3fa0e7db1fa7c08d6158 (diff)
downloadop-kernel-dev-bea3348eef27e6044b6161fd04c3152215f96411.zip
op-kernel-dev-bea3348eef27e6044b6161fd04c3152215f96411.tar.gz
[NET]: Make NAPI polling independent of struct net_device objects.
Several devices have multiple independant RX queues per net device, and some have a single interrupt doorbell for several queues. In either case, it's easier to support layouts like that if the structure representing the poll is independant from the net device itself. The signature of the ->poll() call back goes from: int foo_poll(struct net_device *dev, int *budget) to int foo_poll(struct napi_struct *napi, int budget) The caller is returned the number of RX packets processed (or the number of "NAPI credits" consumed if you want to get abstract). The callee no longer messes around bumping dev->quota, *budget, etc. because that is all handled in the caller upon return. The napi_struct is to be embedded in the device driver private data structures. Furthermore, it is the driver's responsibility to disable all NAPI instances in it's ->stop() device close handler. Since the napi_struct is privatized into the driver's private data structures, only the driver knows how to get at all of the napi_struct instances it may have per-device. With lots of help and suggestions from Rusty Russell, Roland Dreier, Michael Chan, Jeff Garzik, and Jamal Hadi Salim. Bug fixes from Thomas Graf, Roland Dreier, Peter Zijlstra, Joseph Fannin, Scott Wood, Hans J. Koch, and Michael Chan. [ Ported to current tree and all drivers converted. Integrated Stephen's follow-on kerneldoc additions, and restored poll_list handling to the old style to fix mutual exclusion issues. -DaveM ] Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/spider_net.c')
-rw-r--r--drivers/net/spider_net.c60
1 files changed, 27 insertions, 33 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 82d837a..6d8f2bb 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1278,34 +1278,26 @@ bad_desc:
* (using netif_receive_skb). If all/enough packets are up, the driver
* reenables interrupts and returns 0. If not, 1 is returned.
*/
-static int
-spider_net_poll(struct net_device *netdev, int *budget)
+static int spider_net_poll(struct napi_struct *napi, int budget)
{
- struct spider_net_card *card = netdev_priv(netdev);
- int packets_to_do, packets_done = 0;
- int no_more_packets = 0;
-
- packets_to_do = min(*budget, netdev->quota);
-
- while (packets_to_do) {
- if (spider_net_decode_one_descr(card)) {
- packets_done++;
- packets_to_do--;
- } else {
- /* no more packets for the stack */
- no_more_packets = 1;
+ struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
+ struct net_device *netdev = card->netdev;
+ int packets_done = 0;
+
+ while (packets_done < budget) {
+ if (!spider_net_decode_one_descr(card))
break;
- }
+
+ packets_done++;
}
if ((packets_done == 0) && (card->num_rx_ints != 0)) {
- no_more_packets = spider_net_resync_tail_ptr(card);
+ if (!spider_net_resync_tail_ptr(card))
+ packets_done = budget;
spider_net_resync_head_ptr(card);
}
card->num_rx_ints = 0;
- netdev->quota -= packets_done;
- *budget -= packets_done;
spider_net_refill_rx_chain(card);
spider_net_enable_rxdmac(card);
@@ -1313,14 +1305,13 @@ spider_net_poll(struct net_device *netdev, int *budget)
/* if all packets are in the stack, enable interrupts and return 0 */
/* if not, return 1 */
- if (no_more_packets) {
- netif_rx_complete(netdev);
+ if (packets_done < budget) {
+ netif_rx_complete(netdev, napi);
spider_net_rx_irq_on(card);
card->ignore_rx_ramfull = 0;
- return 0;
}
- return 1;
+ return packets_done;
}
/**
@@ -1560,7 +1551,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
spider_net_refill_rx_chain(card);
spider_net_enable_rxdmac(card);
card->num_rx_ints ++;
- netif_rx_schedule(card->netdev);
+ netif_rx_schedule(card->netdev,
+ &card->napi);
}
show_error = 0;
break;
@@ -1580,7 +1572,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
spider_net_refill_rx_chain(card);
spider_net_enable_rxdmac(card);
card->num_rx_ints ++;
- netif_rx_schedule(card->netdev);
+ netif_rx_schedule(card->netdev,
+ &card->napi);
show_error = 0;
break;
@@ -1594,7 +1587,8 @@ spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
spider_net_refill_rx_chain(card);
spider_net_enable_rxdmac(card);
card->num_rx_ints ++;
- netif_rx_schedule(card->netdev);
+ netif_rx_schedule(card->netdev,
+ &card->napi);
show_error = 0;
break;
@@ -1686,11 +1680,11 @@ spider_net_interrupt(int irq, void *ptr)
if (status_reg & SPIDER_NET_RXINT ) {
spider_net_rx_irq_off(card);
- netif_rx_schedule(netdev);
+ netif_rx_schedule(netdev, &card->napi);
card->num_rx_ints ++;
}
if (status_reg & SPIDER_NET_TXINT)
- netif_rx_schedule(netdev);
+ netif_rx_schedule(netdev, &card->napi);
if (status_reg & SPIDER_NET_LINKINT)
spider_net_link_reset(netdev);
@@ -2034,7 +2028,7 @@ spider_net_open(struct net_device *netdev)
netif_start_queue(netdev);
netif_carrier_on(netdev);
- netif_poll_enable(netdev);
+ napi_enable(&card->napi);
spider_net_enable_interrupts(card);
@@ -2204,7 +2198,7 @@ spider_net_stop(struct net_device *netdev)
{
struct spider_net_card *card = netdev_priv(netdev);
- netif_poll_disable(netdev);
+ napi_disable(&card->napi);
netif_carrier_off(netdev);
netif_stop_queue(netdev);
del_timer_sync(&card->tx_timer);
@@ -2304,9 +2298,6 @@ spider_net_setup_netdev_ops(struct net_device *netdev)
/* tx watchdog */
netdev->tx_timeout = &spider_net_tx_timeout;
netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
- /* NAPI */
- netdev->poll = &spider_net_poll;
- netdev->weight = SPIDER_NET_NAPI_WEIGHT;
/* HW VLAN */
#ifdef CONFIG_NET_POLL_CONTROLLER
/* poll controller */
@@ -2351,6 +2342,9 @@ spider_net_setup_netdev(struct spider_net_card *card)
card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;
+ netif_napi_add(netdev, &card->napi,
+ spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
+
spider_net_setup_netdev_ops(netdev);
netdev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX;
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