netdev - [RFC PATCH net-next 07/12] mlxsw: pci: Query and store PCIe bandwidth during init

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Message-Id: <20190528122136.30476-8-idosch@idosch.org>
Date:   Tue, 28 May 2019 15:21:31 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...lanox.com, mlxsw@...lanox.com,
        dsahern@...il.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com, andy@...yhouse.net,
        pablo@...filter.org, jakub.kicinski@...ronome.com,
        pieter.jansenvanvuuren@...ronome.com, andrew@...n.ch,
        f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        Ido Schimmel <idosch@...lanox.com>
Subject: [RFC PATCH net-next 07/12] mlxsw: pci: Query and store PCIe bandwidth during init

From: Ido Schimmel <idosch@...lanox.com>

A subsequent patch will need to set the CPU policer for dropped packets
to 80% of available PCIe bandwidth. Query and store and PCIe bandwidth,
so that it can be used by the switch driver later on.

For I2C bus we simply return 0 as currently there is no use case for
which it is required.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.h | 1 +
 drivers/net/ethernet/mellanox/mlxsw/pci.c  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.h b/drivers/net/ethernet/mellanox/mlxsw/core.h
index e3832cb5bdda..5add61a7514e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.h
@@ -354,6 +354,7 @@ struct mlxsw_bus_info {
 	u8 vsd[MLXSW_CMD_BOARDINFO_VSD_LEN];
 	u8 psid[MLXSW_CMD_BOARDINFO_PSID_LEN];
 	u8 low_frequency;
+	u32 bandwidth;	/* Mb/s */
 };
 
 struct mlxsw_hwmon;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/pci.c b/drivers/net/ethernet/mellanox/mlxsw/pci.c
index b40455f8293d..3184b8ea1632 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/pci.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/pci.c
@@ -1740,6 +1740,8 @@ static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	mlxsw_pci->bus_info.device_kind = driver_name;
 	mlxsw_pci->bus_info.device_name = pci_name(mlxsw_pci->pdev);
 	mlxsw_pci->bus_info.dev = &pdev->dev;
+	mlxsw_pci->bus_info.bandwidth = pcie_bandwidth_available(pdev, NULL,
+								 NULL, NULL);
 	mlxsw_pci->id = id;
 
 	err = mlxsw_core_bus_device_register(&mlxsw_pci->bus_info,
-- 
2.20.1