qlcnic: dcb: Query adapter DCB capabilities.

o Query adapter DCB capabilities and  populate local data structures
  with relevant information.

o Add QLCNIC_DCB to Kconfig for enabling/disabling DCB.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 213 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c
new file mode 100644
index 000000000000..121e492f2f87
--- /dev/null
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.c
@@ -0,0 +1,213 @@
+/*
+ * QLogic qlcnic NIC Driver
+ * Copyright (c)  2009-2013 QLogic Corporation
+ *
+ * See LICENSE.qlcnic for copyright and licensing details.
+ */
+
+#include "qlcnic.h"
+
+#define QLC_DCB_MAX_TC			0x8
+
+#define QLC_DCB_TSA_SUPPORT(V)		(V & 0x1)
+#define QLC_DCB_ETS_SUPPORT(V)		((V >> 1) & 0x1)
+#define QLC_DCB_VERSION_SUPPORT(V)	((V >> 2) & 0xf)
+#define QLC_DCB_MAX_NUM_TC(V)		((V >> 20) & 0xf)
+#define QLC_DCB_MAX_NUM_ETS_TC(V)	((V >> 24) & 0xf)
+#define QLC_DCB_MAX_NUM_PFC_TC(V)	((V >> 28) & 0xf)
+
+static void __qlcnic_dcb_free(struct qlcnic_adapter *);
+static int __qlcnic_dcb_attach(struct qlcnic_adapter *);
+static int __qlcnic_dcb_query_hw_capability(struct qlcnic_adapter *, char *);
+static void __qlcnic_dcb_get_info(struct qlcnic_adapter *);
+
+static int qlcnic_82xx_dcb_get_hw_capability(struct qlcnic_adapter *);
+
+static int qlcnic_83xx_dcb_get_hw_capability(struct qlcnic_adapter *);
+
+struct qlcnic_dcb_capability {
+	bool	tsa_capability;
+	bool	ets_capability;
+	u8	max_num_tc;
+	u8	max_ets_tc;
+	u8	max_pfc_tc;
+	u8	dcb_capability;
+};
+
+struct qlcnic_dcb_cfg {
+	struct qlcnic_dcb_capability capability;
+	u32 version;
+};
+
+static struct qlcnic_dcb_ops qlcnic_83xx_dcb_ops = {
+	.free			= __qlcnic_dcb_free,
+	.attach			= __qlcnic_dcb_attach,
+	.query_hw_capability	= __qlcnic_dcb_query_hw_capability,
+	.get_info		= __qlcnic_dcb_get_info,
+
+	.get_hw_capability	= qlcnic_83xx_dcb_get_hw_capability,
+};
+
+static struct qlcnic_dcb_ops qlcnic_82xx_dcb_ops = {
+	.free			= __qlcnic_dcb_free,
+	.attach			= __qlcnic_dcb_attach,
+	.query_hw_capability	= __qlcnic_dcb_query_hw_capability,
+	.get_info		= __qlcnic_dcb_get_info,
+
+	.get_hw_capability	= qlcnic_82xx_dcb_get_hw_capability,
+};
+
+void qlcnic_set_dcb_ops(struct qlcnic_adapter *adapter)
+{
+	if (qlcnic_82xx_check(adapter))
+		adapter->dcb->ops = &qlcnic_82xx_dcb_ops;
+	else if (qlcnic_83xx_check(adapter))
+		adapter->dcb->ops = &qlcnic_83xx_dcb_ops;
+}
+
+int __qlcnic_register_dcb(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_dcb *dcb;
+
+	dcb = kzalloc(sizeof(struct qlcnic_dcb), GFP_ATOMIC);
+	if (!dcb)
+		return -ENOMEM;
+
+	adapter->dcb = dcb;
+	qlcnic_set_dcb_ops(adapter);
+
+	return 0;
+}
+
+static void __qlcnic_dcb_free(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_dcb *dcb = adapter->dcb;
+
+	if (!dcb)
+		return;
+
+	kfree(dcb->cfg);
+	dcb->cfg = NULL;
+	kfree(dcb);
+	adapter->dcb = NULL;
+}
+
+static void __qlcnic_dcb_get_info(struct qlcnic_adapter *adapter)
+{
+	qlcnic_dcb_get_hw_capability(adapter);
+}
+
+static int __qlcnic_dcb_attach(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_dcb *dcb = adapter->dcb;
+
+	dcb->cfg = kzalloc(sizeof(struct qlcnic_dcb_cfg), GFP_ATOMIC);
+	if (!dcb->cfg)
+		return -ENOMEM;
+
+	qlcnic_dcb_get_info(adapter);
+
+	return 0;
+}
+
+static int __qlcnic_dcb_query_hw_capability(struct qlcnic_adapter *adapter,
+					    char *buf)
+{
+	struct qlcnic_cmd_args cmd;
+	u32 mbx_out;
+	int err;
+
+	err = qlcnic_alloc_mbx_args(&cmd, adapter, QLCNIC_CMD_DCB_QUERY_CAP);
+	if (err)
+		return err;
+
+	err = qlcnic_issue_cmd(adapter, &cmd);
+	if (err) {
+		dev_err(&adapter->pdev->dev,
+			"Failed to query DCBX capability, err %d\n", err);
+	} else {
+		mbx_out = cmd.rsp.arg[1];
+		if (buf)
+			memcpy(buf, &mbx_out, sizeof(u32));
+	}
+
+	qlcnic_free_mbx_args(&cmd);
+
+	return err;
+}
+
+static int __qlcnic_dcb_get_capability(struct qlcnic_adapter *adapter, u32 *val)
+{
+	struct qlcnic_dcb_capability *cap = &adapter->dcb->cfg->capability;
+	u32 mbx_out;
+	int err;
+
+	memset(cap, 0, sizeof(struct qlcnic_dcb_capability));
+
+	err = qlcnic_dcb_query_hw_capability(adapter, (char *)val);
+	if (err)
+		return err;
+
+	mbx_out = *val;
+	if (QLC_DCB_TSA_SUPPORT(mbx_out))
+		cap->tsa_capability = true;
+
+	if (QLC_DCB_ETS_SUPPORT(mbx_out))
+		cap->ets_capability = true;
+
+	cap->max_num_tc = QLC_DCB_MAX_NUM_TC(mbx_out);
+	cap->max_ets_tc = QLC_DCB_MAX_NUM_ETS_TC(mbx_out);
+	cap->max_pfc_tc = QLC_DCB_MAX_NUM_PFC_TC(mbx_out);
+
+	if (cap->max_num_tc > QLC_DCB_MAX_TC ||
+	    cap->max_ets_tc > cap->max_num_tc ||
+	    cap->max_pfc_tc > cap->max_num_tc) {
+		dev_err(&adapter->pdev->dev, "Invalid DCB configuration\n");
+		return -EINVAL;
+	}
+
+	return err;
+}
+
+static int qlcnic_82xx_dcb_get_hw_capability(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_dcb_cfg *cfg = adapter->dcb->cfg;
+	struct qlcnic_dcb_capability *cap;
+	u32 mbx_out;
+	int err;
+
+	err = __qlcnic_dcb_get_capability(adapter, &mbx_out);
+	if (err)
+		return err;
+
+	cap = &cfg->capability;
+	cap->dcb_capability = DCB_CAP_DCBX_VER_CEE | DCB_CAP_DCBX_LLD_MANAGED;
+
+	if (cap->dcb_capability && cap->tsa_capability && cap->ets_capability)
+		set_bit(__QLCNIC_DCB_STATE, &adapter->state);
+
+	return err;
+}
+
+static int qlcnic_83xx_dcb_get_hw_capability(struct qlcnic_adapter *adapter)
+{
+	struct qlcnic_dcb_capability *cap = &adapter->dcb->cfg->capability;
+	u32 mbx_out;
+	int err;
+
+	err = __qlcnic_dcb_get_capability(adapter, &mbx_out);
+	if (err)
+		return err;
+
+	if (mbx_out & BIT_2)
+		cap->dcb_capability = DCB_CAP_DCBX_VER_CEE;
+	if (mbx_out & BIT_3)
+		cap->dcb_capability |= DCB_CAP_DCBX_VER_IEEE;
+	if (cap->dcb_capability)
+		cap->dcb_capability |= DCB_CAP_DCBX_LLD_MANAGED;
+
+	if (cap->dcb_capability && cap->tsa_capability && cap->ets_capability)
+		set_bit(__QLCNIC_DCB_STATE, &adapter->state);
+
+	return err;
+}