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cxgb4: Detect DB FULL events and notify RDMA ULD 

Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Vipul Pandya 2012-05-18 15:29:24 +05:30 committed by Roland Dreier
parent 14b9222808
commit 881806bc15
5 changed files with 103 additions and 0 deletions
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4
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -504,6 +504,8 @@ struct adapter {
void **tid_release_head;
spinlock_t tid_release_lock;
struct work_struct tid_release_task;
struct work_struct db_full_task;
struct work_struct db_drop_task;
bool tid_release_task_busy;
struct dentry *debugfs_root;
@ -719,4 +721,6 @@ int t4_ctrl_eq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
int t4_ofld_eq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
unsigned int vf, unsigned int eqid);
int t4_handle_fw_rpl(struct adapter *adap, const __be64 *rpl);
void t4_db_full(struct adapter *adapter);
void t4_db_dropped(struct adapter *adapter);
#endif /* __CXGB4_H__ */

77
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -2366,6 +2366,16 @@ unsigned int cxgb4_port_chan(const struct net_device *dev)
}
EXPORT_SYMBOL(cxgb4_port_chan);
unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo)
{
struct adapter *adap = netdev2adap(dev);
u32 v;
v = t4_read_reg(adap, A_SGE_DBFIFO_STATUS);
return lpfifo ? G_LP_COUNT(v) : G_HP_COUNT(v);
}
EXPORT_SYMBOL(cxgb4_dbfifo_count);
/**
* cxgb4_port_viid - get the VI id of a port
* @dev: the net device for the port
@ -2446,6 +2456,69 @@ static struct notifier_block cxgb4_netevent_nb = {
.notifier_call = netevent_cb
};
static void notify_rdma_uld(struct adapter *adap, enum cxgb4_control cmd)
{
mutex_lock(&uld_mutex);
if (adap->uld_handle[CXGB4_ULD_RDMA])
ulds[CXGB4_ULD_RDMA].control(adap->uld_handle[CXGB4_ULD_RDMA],
cmd);
mutex_unlock(&uld_mutex);
}
static void process_db_full(struct work_struct *work)
{
struct adapter *adap;
static int delay = 1000;
u32 v;
adap = container_of(work, struct adapter, db_full_task);
/* stop LLD queues */
notify_rdma_uld(adap, CXGB4_CONTROL_DB_FULL);
do {
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(usecs_to_jiffies(delay));
v = t4_read_reg(adap, A_SGE_DBFIFO_STATUS);
if (G_LP_COUNT(v) == 0 && G_HP_COUNT(v) == 0)
break;
} while (1);
notify_rdma_uld(adap, CXGB4_CONTROL_DB_EMPTY);
/*
* The more we get db full interrupts, the more we'll delay
* in re-enabling db rings on queues, capped off at 200ms.
*/
delay = min(delay << 1, 200000);
/* resume LLD queues */
}
static void process_db_drop(struct work_struct *work)
{
struct adapter *adap;
adap = container_of(work, struct adapter, db_drop_task);
/*
* sync the PIDX values in HW and SW for LLD queues.
*/
notify_rdma_uld(adap, CXGB4_CONTROL_DB_DROP);
}
void t4_db_full(struct adapter *adap)
{
schedule_work(&adap->db_full_task);
}
void t4_db_dropped(struct adapter *adap)
{
schedule_work(&adap->db_drop_task);
}
static void uld_attach(struct adapter *adap, unsigned int uld)
{
void *handle;
@ -2649,6 +2722,8 @@ static void cxgb_down(struct adapter *adapter)
{
t4_intr_disable(adapter);
cancel_work_sync(&adapter->tid_release_task);
cancel_work_sync(&adapter->db_full_task);
cancel_work_sync(&adapter->db_drop_task);
adapter->tid_release_task_busy = false;
adapter->tid_release_head = NULL;
@ -3601,6 +3676,8 @@ static int __devinit init_one(struct pci_dev *pdev,
spin_lock_init(&adapter->tid_release_lock);
INIT_WORK(&adapter->tid_release_task, process_tid_release_list);
INIT_WORK(&adapter->db_full_task, process_db_full);
INIT_WORK(&adapter->db_drop_task, process_db_drop);
err = t4_prep_adapter(adapter);
if (err)

7
drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h
View File

@ -163,6 +163,12 @@ enum cxgb4_state {
CXGB4_STATE_DETACH
};
enum cxgb4_control {
CXGB4_CONTROL_DB_FULL,
CXGB4_CONTROL_DB_EMPTY,
CXGB4_CONTROL_DB_DROP,
};
struct pci_dev;
struct l2t_data;
struct net_device;
@ -225,6 +231,7 @@ struct cxgb4_uld_info {
int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
int cxgb4_unregister_uld(enum cxgb4_uld type);
int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo);
unsigned int cxgb4_port_chan(const struct net_device *dev);
unsigned int cxgb4_port_viid(const struct net_device *dev);
unsigned int cxgb4_port_idx(const struct net_device *dev);

6
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -2415,6 +2415,12 @@ void t4_sge_init(struct adapter *adap)
RXPKTCPLMODE |
(STAT_LEN == 128 ? EGRSTATUSPAGESIZE : 0));
t4_set_reg_field(adap, A_SGE_DBFIFO_STATUS,
V_HP_INT_THRESH(5) | V_LP_INT_THRESH(5),
V_HP_INT_THRESH(5) | V_LP_INT_THRESH(5));
t4_set_reg_field(adap, A_SGE_DOORBELL_CONTROL, F_ENABLE_DROP,
F_ENABLE_DROP);
for (i = v = 0; i < 32; i += 4)
v |= (PAGE_SHIFT - 10) << i;
t4_write_reg(adap, SGE_HOST_PAGE_SIZE, v);

9
drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
View File

@ -1013,6 +1013,8 @@ static void sge_intr_handler(struct adapter *adapter)
{ ERR_INVALID_CIDX_INC,
"SGE GTS CIDX increment too large", -1, 0 },
{ ERR_CPL_OPCODE_0, "SGE received 0-length CPL", -1, 0 },
{ F_DBFIFO_LP_INT, NULL, -1, 0 },
{ F_DBFIFO_HP_INT, NULL, -1, 0 },
{ ERR_DROPPED_DB, "SGE doorbell dropped", -1, 0 },
{ ERR_DATA_CPL_ON_HIGH_QID1 | ERR_DATA_CPL_ON_HIGH_QID0,
"SGE IQID > 1023 received CPL for FL", -1, 0 },
@ -1042,6 +1044,12 @@ static void sge_intr_handler(struct adapter *adapter)
t4_write_reg(adapter, SGE_INT_CAUSE2, v >> 32);
}
err = t4_read_reg(adapter, A_SGE_INT_CAUSE3);
if (err & (F_DBFIFO_HP_INT|F_DBFIFO_LP_INT))
t4_db_full(adapter);
if (err & F_ERR_DROPPED_DB)
t4_db_dropped(adapter);
if (t4_handle_intr_status(adapter, SGE_INT_CAUSE3, sge_intr_info) ||
v != 0)
t4_fatal_err(adapter);
@ -1513,6 +1521,7 @@ void t4_intr_enable(struct adapter *adapter)
ERR_BAD_DB_PIDX2 | ERR_BAD_DB_PIDX1 |
ERR_BAD_DB_PIDX0 | ERR_ING_CTXT_PRIO |
ERR_EGR_CTXT_PRIO | INGRESS_SIZE_ERR |
F_DBFIFO_HP_INT | F_DBFIFO_LP_INT |
EGRESS_SIZE_ERR);
t4_write_reg(adapter, MYPF_REG(PL_PF_INT_ENABLE), PF_INTR_MASK);
t4_set_reg_field(adapter, PL_INT_MAP0, 0, 1 << pf);