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authorDavid S. Miller <davem@sunset.davemloft.net>2007-10-12 03:08:29 +0200
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-12 03:08:29 +0200
commit6f535763165331bb91277d7519b507fed22034e5 (patch)
tree1968a01affa1cce3a3199c455d1fe1ebdca3ff47 /drivers/net/tg3.c
parent[TCP]: Limit processing lost_retrans loop to work-to-do cases (diff)
downloadlinux-6f535763165331bb91277d7519b507fed22034e5.tar.xz
linux-6f535763165331bb91277d7519b507fed22034e5.zip
[NET]: Fix NAPI completion handling in some drivers.
In order for the list handling in net_rx_action() to be correct, drivers must follow certain rules as stated by this comment in net_rx_action(): /* Drivers must not modify the NAPI state if they * consume the entire weight. In such cases this code * still "owns" the NAPI instance and therefore can * move the instance around on the list at-will. */ A few drivers do not do this because they mix the budget checks with reading hardware state, resulting in crashes like the one reported by takano@axe-inc.co.jp. BNX2 and TG3 are taken care of here, SKY2 fix is from Stephen Hemminger. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--drivers/net/tg3.c55
1 files changed, 37 insertions, 18 deletions
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index d2b30fb0b318..a402b5c01896 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -3555,12 +3555,9 @@ next_pkt_nopost:
return received;
}
-static int tg3_poll(struct napi_struct *napi, int budget)
+static int tg3_poll_work(struct tg3 *tp, int work_done, int budget)
{
- struct tg3 *tp = container_of(napi, struct tg3, napi);
- struct net_device *netdev = tp->dev;
struct tg3_hw_status *sblk = tp->hw_status;
- int work_done = 0;
/* handle link change and other phy events */
if (!(tp->tg3_flags &
@@ -3578,11 +3575,8 @@ static int tg3_poll(struct napi_struct *napi, int budget)
/* run TX completion thread */
if (sblk->idx[0].tx_consumer != tp->tx_cons) {
tg3_tx(tp);
- if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING)) {
- netif_rx_complete(netdev, napi);
- schedule_work(&tp->reset_task);
+ if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING))
return 0;
- }
}
/* run RX thread, within the bounds set by NAPI.
@@ -3590,21 +3584,46 @@ static int tg3_poll(struct napi_struct *napi, int budget)
* code synchronizes with tg3->napi.poll()
*/
if (sblk->idx[0].rx_producer != tp->rx_rcb_ptr)
- work_done = tg3_rx(tp, budget);
+ work_done += tg3_rx(tp, budget - work_done);
- if (tp->tg3_flags & TG3_FLAG_TAGGED_STATUS) {
- tp->last_tag = sblk->status_tag;
- rmb();
- } else
- sblk->status &= ~SD_STATUS_UPDATED;
+ return work_done;
+}
- /* if no more work, tell net stack and NIC we're done */
- if (!tg3_has_work(tp)) {
- netif_rx_complete(netdev, napi);
- tg3_restart_ints(tp);
+static int tg3_poll(struct napi_struct *napi, int budget)
+{
+ struct tg3 *tp = container_of(napi, struct tg3, napi);
+ int work_done = 0;
+
+ while (1) {
+ work_done = tg3_poll_work(tp, work_done, budget);
+
+ if (unlikely(tp->tg3_flags & TG3_FLAG_TX_RECOVERY_PENDING))
+ goto tx_recovery;
+
+ if (unlikely(work_done >= budget))
+ break;
+
+ if (likely(!tg3_has_work(tp))) {
+ struct tg3_hw_status *sblk = tp->hw_status;
+
+ if (tp->tg3_flags & TG3_FLAG_TAGGED_STATUS) {
+ tp->last_tag = sblk->status_tag;
+ rmb();
+ } else
+ sblk->status &= ~SD_STATUS_UPDATED;
+
+ netif_rx_complete(tp->dev, napi);
+ tg3_restart_ints(tp);
+ break;
+ }
}
return work_done;
+
+tx_recovery:
+ netif_rx_complete(tp->dev, napi);
+ schedule_work(&tp->reset_task);
+ return 0;
}
static void tg3_irq_quiesce(struct tg3 *tp)