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be2net: fix tx completion polling

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In tx/mcc polling, napi_complete() is being incorrectly called
before reaping tx completions. This can cause tx compl processing
to be scheduled on another cpu concurrently which can result in a panic.
This if fixed by calling napi complete() after tx/mcc compl processing
but before re-enabling interrupts (via a cq notify).

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sathya Perla
2010-03-02 03:56:39 -08:00
committed by David S. Miller
parent b88aafd365
commit f31e50a802
3 changed files with 38 additions and 39 deletions
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47
drivers/net/benet/be_main.c
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@@ -583,7 +583,7 @@ static void be_set_multicast_list(struct net_device *netdev)
}
be_cmd_multicast_set(adapter, adapter->if_handle, netdev,
&adapter->mc_cmd_mem);
&adapter->mc_cmd_mem);
done:
return;
}
@@ -1469,23 +1469,38 @@ int be_poll_rx(struct napi_struct *napi, int budget)
return work_done;
}
void be_process_tx(struct be_adapter *adapter)
/* As TX and MCC share the same EQ check for both TX and MCC completions.
* For TX/MCC we don't honour budget; consume everything
*/
static int be_poll_tx_mcc(struct napi_struct *napi, int budget)
{
struct be_eq_obj *tx_eq = container_of(napi, struct be_eq_obj, napi);
struct be_adapter *adapter =
container_of(tx_eq, struct be_adapter, tx_eq);
struct be_queue_info *txq = &adapter->tx_obj.q;
struct be_queue_info *tx_cq = &adapter->tx_obj.cq;
struct be_eth_tx_compl *txcp;
u32 num_cmpl = 0;
int tx_compl = 0, mcc_compl, status = 0;
u16 end_idx;
while ((txcp = be_tx_compl_get(tx_cq))) {
end_idx = AMAP_GET_BITS(struct amap_eth_tx_compl,
wrb_index, txcp);
wrb_index, txcp);
be_tx_compl_process(adapter, end_idx);
num_cmpl++;
tx_compl++;
}
if (num_cmpl) {
be_cq_notify(adapter, tx_cq->id, true, num_cmpl);
mcc_compl = be_process_mcc(adapter, &status);
napi_complete(napi);
if (mcc_compl) {
struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
be_cq_notify(adapter, mcc_obj->cq.id, true, mcc_compl);
}
if (tx_compl) {
be_cq_notify(adapter, adapter->tx_obj.cq.id, true, tx_compl);
/* As Tx wrbs have been freed up, wake up netdev queue if
* it was stopped due to lack of tx wrbs.
@@ -1496,24 +1511,8 @@ void be_process_tx(struct be_adapter *adapter)
}
drvr_stats(adapter)->be_tx_events++;
drvr_stats(adapter)->be_tx_compl += num_cmpl;
drvr_stats(adapter)->be_tx_compl += tx_compl;
}
}
/* As TX and MCC share the same EQ check for both TX and MCC completions.
* For TX/MCC we don't honour budget; consume everything
*/
static int be_poll_tx_mcc(struct napi_struct *napi, int budget)
{
struct be_eq_obj *tx_eq = container_of(napi, struct be_eq_obj, napi);
struct be_adapter *adapter =
container_of(tx_eq, struct be_adapter, tx_eq);
napi_complete(napi);
be_process_tx(adapter);
be_process_mcc(adapter);
return 1;
}