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Date: Fri, 14 Dec 2018 13:51:48 -0800
From: Saeed Mahameed <saeedm@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Aviv Heller <avivh@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 01/13] net/mlx5: Introduce inter-device communication mechanism
From: Aviv Heller <avivh@...lanox.com>
This introduces devcom, a generic mechanism for performing operations
on both physical functions of the same Connect-X card.
The first user of this API is merged eswitch, which will be introduced
in subsequent patches.
Signed-off-by: Aviv Heller <avivh@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
.../net/ethernet/mellanox/mlx5/core/Makefile | 2 +-
.../ethernet/mellanox/mlx5/core/lib/devcom.c | 255 ++++++++++++++++++
.../ethernet/mellanox/mlx5/core/lib/devcom.h | 44 +++
.../net/ethernet/mellanox/mlx5/core/main.c | 14 +-
include/linux/mlx5/driver.h | 2 +
5 files changed, 313 insertions(+), 4 deletions(-)
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index 9678051b8ff1..9de9abacf7f6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -15,7 +15,7 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
health.o mcg.o cq.o alloc.o qp.o port.o mr.o pd.o \
mad.o transobj.o vport.o sriov.o fs_cmd.o fs_core.o \
fs_counters.o rl.o lag.o dev.o events.o wq.o lib/gid.o \
- diag/fs_tracepoint.o diag/fw_tracer.o
+ lib/devcom.o diag/fs_tracepoint.o diag/fw_tracer.o
#
# Netdev basic
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
new file mode 100644
index 000000000000..bced2efe9bef
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
@@ -0,0 +1,255 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2018 Mellanox Technologies */
+
+#include <linux/mlx5/vport.h>
+#include "lib/devcom.h"
+
+static LIST_HEAD(devcom_list);
+
+#define devcom_for_each_component(priv, comp, iter) \
+ for (iter = 0; \
+ comp = &(priv)->components[iter], iter < MLX5_DEVCOM_NUM_COMPONENTS; \
+ iter++)
+
+struct mlx5_devcom_component {
+ struct {
+ void *data;
+ } device[MLX5_MAX_PORTS];
+
+ mlx5_devcom_event_handler_t handler;
+ struct rw_semaphore sem;
+ bool paired;
+};
+
+struct mlx5_devcom_list {
+ struct list_head list;
+
+ struct mlx5_devcom_component components[MLX5_DEVCOM_NUM_COMPONENTS];
+ struct mlx5_core_dev *devs[MLX5_MAX_PORTS];
+};
+
+struct mlx5_devcom {
+ struct mlx5_devcom_list *priv;
+ int idx;
+};
+
+static struct mlx5_devcom_list *mlx5_devcom_list_alloc(void)
+{
+ struct mlx5_devcom_component *comp;
+ struct mlx5_devcom_list *priv;
+ int i;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return NULL;
+
+ devcom_for_each_component(priv, comp, i)
+ init_rwsem(&comp->sem);
+
+ return priv;
+}
+
+static struct mlx5_devcom *mlx5_devcom_alloc(struct mlx5_devcom_list *priv,
+ u8 idx)
+{
+ struct mlx5_devcom *devcom;
+
+ devcom = kzalloc(sizeof(*devcom), GFP_KERNEL);
+ if (!devcom)
+ return NULL;
+
+ devcom->priv = priv;
+ devcom->idx = idx;
+ return devcom;
+}
+
+/* Must be called with intf_mutex held */
+struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev)
+{
+ struct mlx5_devcom_list *priv = NULL, *iter;
+ struct mlx5_devcom *devcom = NULL;
+ bool new_priv = false;
+ u64 sguid0, sguid1;
+ int idx, i;
+
+ if (!mlx5_core_is_pf(dev))
+ return NULL;
+
+ sguid0 = mlx5_query_nic_system_image_guid(dev);
+ list_for_each_entry(iter, &devcom_list, list) {
+ struct mlx5_core_dev *tmp_dev = NULL;
+
+ idx = -1;
+ for (i = 0; i < MLX5_MAX_PORTS; i++) {
+ if (iter->devs[i])
+ tmp_dev = iter->devs[i];
+ else
+ idx = i;
+ }
+
+ if (idx == -1)
+ continue;
+
+ sguid1 = mlx5_query_nic_system_image_guid(tmp_dev);
+ if (sguid0 != sguid1)
+ continue;
+
+ priv = iter;
+ break;
+ }
+
+ if (!priv) {
+ priv = mlx5_devcom_list_alloc();
+ if (!priv)
+ return ERR_PTR(-ENOMEM);
+
+ idx = 0;
+ new_priv = true;
+ }
+
+ priv->devs[idx] = dev;
+ devcom = mlx5_devcom_alloc(priv, idx);
+ if (!devcom) {
+ kfree(priv);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ if (new_priv)
+ list_add(&priv->list, &devcom_list);
+
+ return devcom;
+}
+
+/* Must be called with intf_mutex held */
+void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom)
+{
+ struct mlx5_devcom_list *priv;
+ int i;
+
+ if (IS_ERR_OR_NULL(devcom))
+ return;
+
+ priv = devcom->priv;
+ priv->devs[devcom->idx] = NULL;
+
+ kfree(devcom);
+
+ for (i = 0; i < MLX5_MAX_PORTS; i++)
+ if (priv->devs[i])
+ break;
+
+ if (i != MLX5_MAX_PORTS)
+ return;
+
+ list_del(&priv->list);
+ kfree(priv);
+}
+
+void mlx5_devcom_register_component(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ mlx5_devcom_event_handler_t handler,
+ void *data)
+{
+ struct mlx5_devcom_component *comp;
+
+ if (IS_ERR_OR_NULL(devcom))
+ return;
+
+ WARN_ON(!data);
+
+ comp = &devcom->priv->components[id];
+ down_write(&comp->sem);
+ comp->handler = handler;
+ comp->device[devcom->idx].data = data;
+ up_write(&comp->sem);
+}
+
+void mlx5_devcom_unregister_component(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id)
+{
+ struct mlx5_devcom_component *comp;
+
+ if (IS_ERR_OR_NULL(devcom))
+ return;
+
+ comp = &devcom->priv->components[id];
+ down_write(&comp->sem);
+ comp->device[devcom->idx].data = NULL;
+ up_write(&comp->sem);
+}
+
+int mlx5_devcom_send_event(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ int event,
+ void *event_data)
+{
+ struct mlx5_devcom_component *comp;
+ int err = -ENODEV, i;
+
+ if (IS_ERR_OR_NULL(devcom))
+ return err;
+
+ comp = &devcom->priv->components[id];
+ down_write(&comp->sem);
+ for (i = 0; i < MLX5_MAX_PORTS; i++)
+ if (i != devcom->idx && comp->device[i].data) {
+ err = comp->handler(event, comp->device[i].data,
+ event_data);
+ break;
+ }
+
+ up_write(&comp->sem);
+ return err;
+}
+
+void mlx5_devcom_set_paired(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ bool paired)
+{
+ struct mlx5_devcom_component *comp;
+
+ comp = &devcom->priv->components[id];
+ WARN_ON(!rwsem_is_locked(&comp->sem));
+
+ comp->paired = paired;
+}
+
+bool mlx5_devcom_is_paired(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id)
+{
+ if (IS_ERR_OR_NULL(devcom))
+ return false;
+
+ return devcom->priv->components[id].paired;
+}
+
+void *mlx5_devcom_get_peer_data(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id)
+{
+ struct mlx5_devcom_component *comp;
+ int i;
+
+ if (IS_ERR_OR_NULL(devcom))
+ return NULL;
+
+ comp = &devcom->priv->components[id];
+ down_read(&comp->sem);
+ if (!comp->paired) {
+ up_read(&comp->sem);
+ return NULL;
+ }
+
+ for (i = 0; i < MLX5_MAX_PORTS; i++)
+ if (i != devcom->idx)
+ break;
+
+ return comp->device[i].data;
+}
+
+void mlx5_devcom_release_peer_data(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id)
+{
+ struct mlx5_devcom_component *comp = &devcom->priv->components[id];
+
+ up_read(&comp->sem);
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
new file mode 100644
index 000000000000..f2d338b187a6
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2018 Mellanox Technologies */
+
+#ifndef __LIB_MLX5_DEVCOM_H__
+#define __LIB_MLX5_DEVCOM_H__
+
+#include <linux/mlx5/driver.h>
+
+enum mlx5_devcom_components {
+ MLX5_DEVCOM_NUM_COMPONENTS,
+};
+
+typedef int (*mlx5_devcom_event_handler_t)(int event,
+ void *my_data,
+ void *event_data);
+
+struct mlx5_devcom *mlx5_devcom_register_device(struct mlx5_core_dev *dev);
+void mlx5_devcom_unregister_device(struct mlx5_devcom *devcom);
+
+void mlx5_devcom_register_component(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ mlx5_devcom_event_handler_t handler,
+ void *data);
+void mlx5_devcom_unregister_component(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id);
+
+int mlx5_devcom_send_event(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ int event,
+ void *event_data);
+
+void mlx5_devcom_set_paired(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id,
+ bool paired);
+bool mlx5_devcom_is_paired(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id);
+
+void *mlx5_devcom_get_peer_data(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id);
+void mlx5_devcom_release_peer_data(struct mlx5_devcom *devcom,
+ enum mlx5_devcom_components id);
+
+#endif
+
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 778995573812..c23553164e0d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -63,6 +63,7 @@
#include "accel/tls.h"
#include "lib/clock.h"
#include "lib/vxlan.h"
+#include "lib/devcom.h"
#include "diag/fw_tracer.h"
MODULE_AUTHOR("Eli Cohen <eli@...lanox.com>");
@@ -722,16 +723,21 @@ static int mlx5_init_once(struct mlx5_core_dev *dev, struct mlx5_priv *priv)
struct pci_dev *pdev = dev->pdev;
int err;
+ priv->devcom = mlx5_devcom_register_device(dev);
+ if (IS_ERR(priv->devcom))
+ dev_err(&pdev->dev, "failed to register with devcom (0x%p)\n",
+ priv->devcom);
+
err = mlx5_query_board_id(dev);
if (err) {
dev_err(&pdev->dev, "query board id failed\n");
- goto out;
+ goto err_devcom;
}
err = mlx5_eq_table_init(dev);
if (err) {
dev_err(&pdev->dev, "failed to initialize eq\n");
- goto out;
+ goto err_devcom;
}
err = mlx5_events_init(dev);
@@ -807,8 +813,9 @@ static int mlx5_init_once(struct mlx5_core_dev *dev, struct mlx5_priv *priv)
mlx5_events_cleanup(dev);
err_eq_cleanup:
mlx5_eq_table_cleanup(dev);
+err_devcom:
+ mlx5_devcom_unregister_device(dev->priv.devcom);
-out:
return err;
}
@@ -828,6 +835,7 @@ static void mlx5_cleanup_once(struct mlx5_core_dev *dev)
mlx5_cq_debugfs_cleanup(dev);
mlx5_events_cleanup(dev);
mlx5_eq_table_cleanup(dev);
+ mlx5_devcom_unregister_device(dev->priv.devcom);
}
static int mlx5_load_one(struct mlx5_core_dev *dev, struct mlx5_priv *priv,
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index cc29e880c733..cd7af5d0311b 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -486,6 +486,7 @@ struct mlx5_events;
struct mlx5_mpfs;
struct mlx5_eswitch;
struct mlx5_lag;
+struct mlx5_devcom;
struct mlx5_eq_table;
struct mlx5_rate_limit {
@@ -560,6 +561,7 @@ struct mlx5_priv {
struct mlx5_eswitch *eswitch;
struct mlx5_core_sriov sriov;
struct mlx5_lag *lag;
+ struct mlx5_devcom *devcom;
unsigned long pci_dev_data;
struct mlx5_fc_stats fc_stats;
struct mlx5_rl_table rl_table;
--
2.19.2
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