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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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28
drivers/net/benet/be_cmds.c
View File

@ -119,10 +119,10 @@ void be_async_mcc_disable(struct be_adapter *adapter)
adapter->mcc_obj.rearm_cq = false;
}
int be_process_mcc(struct be_adapter *adapter)
int be_process_mcc(struct be_adapter *adapter, int *status)
{
struct be_mcc_compl *compl;
int num = 0, status = 0;
int num = 0;
struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
spin_lock_bh(&adapter->mcc_cq_lock);
@ -135,31 +135,31 @@ int be_process_mcc(struct be_adapter *adapter)
be_async_link_state_process(adapter,
(struct be_async_event_link_state *) compl);
} else if (compl->flags & CQE_FLAGS_COMPLETED_MASK) {
status = be_mcc_compl_process(adapter, compl);
*status = be_mcc_compl_process(adapter, compl);
atomic_dec(&mcc_obj->q.used);
}
be_mcc_compl_use(compl);
num++;
}
if (num)
be_cq_notify(adapter, mcc_obj->cq.id, mcc_obj->rearm_cq, num);
spin_unlock_bh(&adapter->mcc_cq_lock);
return status;
return num;
}
/* Wait till no more pending mcc requests are present */
static int be_mcc_wait_compl(struct be_adapter *adapter)
{
#define mcc_timeout 120000 /* 12s timeout */
int i, status;
for (i = 0; i < mcc_timeout; i++) {
status = be_process_mcc(adapter);
if (status)
return status;
int i, num, status = 0;
struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
if (atomic_read(&adapter->mcc_obj.q.used) == 0)
for (i = 0; i < mcc_timeout; i++) {
num = be_process_mcc(adapter, &status);
if (num)
be_cq_notify(adapter, mcc_obj->cq.id,
mcc_obj->rearm_cq, num);
if (atomic_read(&mcc_obj->q.used) == 0)
break;
udelay(100);
}
@ -167,7 +167,7 @@ static int be_mcc_wait_compl(struct be_adapter *adapter)
dev_err(&adapter->pdev->dev, "mccq poll timed out\n");
return -1;
}
return 0;
return status;
}
/* Notify MCC requests and wait for completion */

2
drivers/net/benet/be_cmds.h
View File

@ -920,7 +920,7 @@ extern int be_cmd_get_flow_control(struct be_adapter *adapter,
extern int be_cmd_query_fw_cfg(struct be_adapter *adapter,
u32 *port_num, u32 *cap);
extern int be_cmd_reset_function(struct be_adapter *adapter);
extern int be_process_mcc(struct be_adapter *adapter);
extern int be_process_mcc(struct be_adapter *adapter, int *status);
extern int be_cmd_set_beacon_state(struct be_adapter *adapter,
u8 port_num, u8 beacon, u8 status, u8 state);
extern int be_cmd_get_beacon_state(struct be_adapter *adapter,

47
drivers/net/benet/be_main.c
View File

@ -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;
}