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Commit 881806bc authored by Vipul Pandya's avatar Vipul Pandya Committed by Roland Dreier
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cxgb4: Detect DB FULL events and notify RDMA ULD

parent 14b92228
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+4 −0
Original line number Original line Diff line number Diff line
@@ -504,6 +504,8 @@ struct adapter {
	void **tid_release_head;
	void **tid_release_head;
	spinlock_t tid_release_lock;
	spinlock_t tid_release_lock;
	struct work_struct tid_release_task;
	struct work_struct tid_release_task;
	struct work_struct db_full_task;
	struct work_struct db_drop_task;
	bool tid_release_task_busy;
	bool tid_release_task_busy;


	struct dentry *debugfs_root;
	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,
int t4_ofld_eq_free(struct adapter *adap, unsigned int mbox, unsigned int pf,
		    unsigned int vf, unsigned int eqid);
		    unsigned int vf, unsigned int eqid);
int t4_handle_fw_rpl(struct adapter *adap, const __be64 *rpl);
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__ */
#endif /* __CXGB4_H__ */
+77 −0
Original line number Original line Diff line number Diff line
@@ -2366,6 +2366,16 @@ unsigned int cxgb4_port_chan(const struct net_device *dev)
}
}
EXPORT_SYMBOL(cxgb4_port_chan);
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
 *	cxgb4_port_viid - get the VI id of a port
 *	@dev: the net device for the port
 *	@dev: the net device for the port
@@ -2446,6 +2456,69 @@ static struct notifier_block cxgb4_netevent_nb = {
	.notifier_call = netevent_cb
	.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)
static void uld_attach(struct adapter *adap, unsigned int uld)
{
{
	void *handle;
	void *handle;
@@ -2649,6 +2722,8 @@ static void cxgb_down(struct adapter *adapter)
{
{
	t4_intr_disable(adapter);
	t4_intr_disable(adapter);
	cancel_work_sync(&adapter->tid_release_task);
	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_task_busy = false;
	adapter->tid_release_head = NULL;
	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);
	spin_lock_init(&adapter->tid_release_lock);


	INIT_WORK(&adapter->tid_release_task, process_tid_release_list);
	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);
	err = t4_prep_adapter(adapter);
	if (err)
	if (err)
+7 −0
Original line number Original line Diff line number Diff line
@@ -163,6 +163,12 @@ enum cxgb4_state {
	CXGB4_STATE_DETACH
	CXGB4_STATE_DETACH
};
};


enum cxgb4_control {
	CXGB4_CONTROL_DB_FULL,
	CXGB4_CONTROL_DB_EMPTY,
	CXGB4_CONTROL_DB_DROP,
};

struct pci_dev;
struct pci_dev;
struct l2t_data;
struct l2t_data;
struct net_device;
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_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
int cxgb4_unregister_uld(enum cxgb4_uld type);
int cxgb4_unregister_uld(enum cxgb4_uld type);
int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
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_chan(const struct net_device *dev);
unsigned int cxgb4_port_viid(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);
unsigned int cxgb4_port_idx(const struct net_device *dev);
+6 −0
Original line number Original line Diff line number Diff line
@@ -2415,6 +2415,12 @@ void t4_sge_init(struct adapter *adap)
			 RXPKTCPLMODE |
			 RXPKTCPLMODE |
			 (STAT_LEN == 128 ? EGRSTATUSPAGESIZE : 0));
			 (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)
	for (i = v = 0; i < 32; i += 4)
		v |= (PAGE_SHIFT - 10) << i;
		v |= (PAGE_SHIFT - 10) << i;
	t4_write_reg(adap, SGE_HOST_PAGE_SIZE, v);
	t4_write_reg(adap, SGE_HOST_PAGE_SIZE, v);
+9 −0
Original line number Original line Diff line number Diff line
@@ -1013,6 +1013,8 @@ static void sge_intr_handler(struct adapter *adapter)
		{ ERR_INVALID_CIDX_INC,
		{ ERR_INVALID_CIDX_INC,
		  "SGE GTS CIDX increment too large", -1, 0 },
		  "SGE GTS CIDX increment too large", -1, 0 },
		{ ERR_CPL_OPCODE_0, "SGE received 0-length CPL", -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_DROPPED_DB, "SGE doorbell dropped", -1, 0 },
		{ ERR_DATA_CPL_ON_HIGH_QID1 | ERR_DATA_CPL_ON_HIGH_QID0,
		{ ERR_DATA_CPL_ON_HIGH_QID1 | ERR_DATA_CPL_ON_HIGH_QID0,
		  "SGE IQID > 1023 received CPL for FL", -1, 0 },
		  "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);
		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) ||
	if (t4_handle_intr_status(adapter, SGE_INT_CAUSE3, sge_intr_info) ||
	    v != 0)
	    v != 0)
		t4_fatal_err(adapter);
		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_PIDX2 | ERR_BAD_DB_PIDX1 |
		     ERR_BAD_DB_PIDX0 | ERR_ING_CTXT_PRIO |
		     ERR_BAD_DB_PIDX0 | ERR_ING_CTXT_PRIO |
		     ERR_EGR_CTXT_PRIO | INGRESS_SIZE_ERR |
		     ERR_EGR_CTXT_PRIO | INGRESS_SIZE_ERR |
		     F_DBFIFO_HP_INT | F_DBFIFO_LP_INT |
		     EGRESS_SIZE_ERR);
		     EGRESS_SIZE_ERR);
	t4_write_reg(adapter, MYPF_REG(PL_PF_INT_ENABLE), PF_INTR_MASK);
	t4_write_reg(adapter, MYPF_REG(PL_PF_INT_ENABLE), PF_INTR_MASK);
	t4_set_reg_field(adapter, PL_INT_MAP0, 0, 1 << pf);
	t4_set_reg_field(adapter, PL_INT_MAP0, 0, 1 << pf);