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kmod-redhat-mlx5_core/SOURCES/0270-netdrv-net-mlx5-E-swit...

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From c8627df5d03e52683da824e64b4330343da7948b Mon Sep 17 00:00:00 2001
From: Alaa Hleihel <ahleihel@redhat.com>
Date: Tue, 19 May 2020 07:49:33 -0400
Subject: [PATCH 270/312] [netdrv] net/mlx5: E-switch, Extend eswitch enable to
handle num_vfs change
Message-id: <20200519074934.6303-63-ahleihel@redhat.com>
Patchwork-id: 310564
Patchwork-instance: patchwork
O-Subject: [RHEL8.3 BZ 1663246 62/63] net/mlx5: E-switch, Extend eswitch enable to handle num_vfs change
Bugzilla: 1835595 1663246
RH-Acked-by: Marcelo Leitner <mleitner@redhat.com>
RH-Acked-by: Jarod Wilson <jarod@redhat.com>
RH-Acked-by: John Linville <linville@redhat.com>
RH-Acked-by: Ivan Vecera <ivecera@redhat.com>
RH-Acked-by: Tony Camuso <tcamuso@redhat.com>
RH-Acked-by: Kamal Heib <kheib@redhat.com>
Bugzilla: http://bugzilla.redhat.com/1835595
Bugzilla: http://bugzilla.redhat.com/1663246
Upstream: v5.7-rc1
commit ebf77bb83f635377ad7946b73490b18ecf50dc29
Author: Parav Pandit <parav@mellanox.com>
Date: Wed Dec 18 04:58:58 2019 -0600
net/mlx5: E-switch, Extend eswitch enable to handle num_vfs change
Subsequent patch protects eswitch mode changes across sriov and devlink
interfaces. It is desirable for eswitch to provide thread safe eswitch
enable and disable APIs.
Hence, extend eswitch enable API to optionally update num_vfs when
requested.
In subsequent patch, eswitch num_vfs are updated after all the eswitch
users eswitch drops its reference count.
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Bodong Wang <bodong@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Alaa Hleihel <ahleihel@redhat.com>
Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
---
drivers/net/ethernet/mellanox/mlx5/core/eswitch.c | 63 +++++++++++++++-------
drivers/net/ethernet/mellanox/mlx5/core/eswitch.h | 10 ++--
.../ethernet/mellanox/mlx5/core/eswitch_offloads.c | 13 +++--
drivers/net/ethernet/mellanox/mlx5/core/sriov.c | 4 +-
4 files changed, 58 insertions(+), 32 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 901466fa1041..19b887ad9392 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -2026,7 +2026,48 @@ static void mlx5_eswitch_get_devlink_param(struct mlx5_eswitch *esw)
}
}
-int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode)
+static void
+mlx5_eswitch_update_num_of_vfs(struct mlx5_eswitch *esw, int num_vfs)
+{
+ const u32 *out;
+
+ WARN_ON_ONCE(esw->mode != MLX5_ESWITCH_NONE);
+
+ if (num_vfs < 0)
+ return;
+
+ if (!mlx5_core_is_ecpf_esw_manager(esw->dev)) {
+ esw->esw_funcs.num_vfs = num_vfs;
+ return;
+ }
+
+ out = mlx5_esw_query_functions(esw->dev);
+ if (IS_ERR(out))
+ return;
+
+ esw->esw_funcs.num_vfs = MLX5_GET(query_esw_functions_out, out,
+ host_params_context.host_num_of_vfs);
+ kvfree(out);
+}
+
+/**
+ * mlx5_eswitch_enable - Enable eswitch
+ * @esw: Pointer to eswitch
+ * @mode: Eswitch mode to enable
+ * @num_vfs: Enable eswitch for given number of VFs. This is optional.
+ * Valid value are 0, > 0 and MLX5_ESWITCH_IGNORE_NUM_VFS.
+ * Caller should pass num_vfs > 0 when enabling eswitch for
+ * vf vports. Caller should pass num_vfs = 0, when eswitch
+ * is enabled without sriov VFs or when caller
+ * is unaware of the sriov state of the host PF on ECPF based
+ * eswitch. Caller should pass < 0 when num_vfs should be
+ * completely ignored. This is typically the case when eswitch
+ * is enabled without sriov regardless of PF/ECPF system.
+ * mlx5_eswitch_enable() Enables eswitch in either legacy or offloads mode.
+ * If num_vfs >=0 is provided, it setup VF related eswitch vports. It returns
+ * 0 on success or error code on failure.
+ */
+int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode, int num_vfs)
{
int err;
@@ -2044,6 +2085,8 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode)
mlx5_eswitch_get_devlink_param(esw);
+ mlx5_eswitch_update_num_of_vfs(esw, num_vfs);
+
esw_create_tsar(esw);
esw->mode = mode;
@@ -2772,22 +2815,4 @@ bool mlx5_esw_multipath_prereq(struct mlx5_core_dev *dev0,
dev1->priv.eswitch->mode == MLX5_ESWITCH_OFFLOADS);
}
-void mlx5_eswitch_update_num_of_vfs(struct mlx5_eswitch *esw, const int num_vfs)
-{
- const u32 *out;
-
- WARN_ON_ONCE(esw->mode != MLX5_ESWITCH_NONE);
-
- if (!mlx5_core_is_ecpf_esw_manager(esw->dev)) {
- esw->esw_funcs.num_vfs = num_vfs;
- return;
- }
-
- out = mlx5_esw_query_functions(esw->dev);
- if (IS_ERR(out))
- return;
- esw->esw_funcs.num_vfs = MLX5_GET(query_esw_functions_out, out,
- host_params_context.host_num_of_vfs);
- kvfree(out);
-}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index dafeb2000269..5ec76f48e9b7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -335,7 +335,9 @@ int mlx5_esw_modify_vport_rate(struct mlx5_eswitch *esw, u16 vport_num,
/* E-Switch API */
int mlx5_eswitch_init(struct mlx5_core_dev *dev);
void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw);
-int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode);
+
+#define MLX5_ESWITCH_IGNORE_NUM_VFS (-1)
+int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode, int num_vfs);
void mlx5_eswitch_disable(struct mlx5_eswitch *esw, bool clear_vf);
int mlx5_eswitch_set_vport_mac(struct mlx5_eswitch *esw,
u16 vport, u8 mac[ETH_ALEN]);
@@ -673,7 +675,6 @@ mlx5_eswitch_get_vport(struct mlx5_eswitch *esw, u16 vport_num);
bool mlx5_eswitch_is_vf_vport(const struct mlx5_eswitch *esw, u16 vport_num);
-void mlx5_eswitch_update_num_of_vfs(struct mlx5_eswitch *esw, const int num_vfs);
int mlx5_esw_funcs_changed_handler(struct notifier_block *nb, unsigned long type, void *data);
int
@@ -700,7 +701,7 @@ esw_get_max_restore_tag(struct mlx5_eswitch *esw);
/* eswitch API stubs */
static inline int mlx5_eswitch_init(struct mlx5_core_dev *dev) { return 0; }
static inline void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw) {}
-static inline int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode) { return 0; }
+static inline int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int mode, int num_vfs) { return 0; }
static inline void mlx5_eswitch_disable(struct mlx5_eswitch *esw, bool clear_vf) {}
static inline bool mlx5_esw_lag_prereq(struct mlx5_core_dev *dev0, struct mlx5_core_dev *dev1) { return true; }
static inline bool mlx5_eswitch_is_funcs_handler(struct mlx5_core_dev *dev) { return false; }
@@ -709,14 +710,11 @@ static inline const u32 *mlx5_esw_query_functions(struct mlx5_core_dev *dev)
return ERR_PTR(-EOPNOTSUPP);
}
-static inline void mlx5_eswitch_update_num_of_vfs(struct mlx5_eswitch *esw, const int num_vfs) {}
-
static inline struct mlx5_flow_handle *
esw_add_restore_rule(struct mlx5_eswitch *esw, u32 tag)
{
return ERR_PTR(-EOPNOTSUPP);
}
-
#endif /* CONFIG_MLX5_ESWITCH */
#endif /* __MLX5_ESWITCH_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 1b74a6f35df9..29280218518a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -1550,12 +1550,13 @@ static int esw_offloads_start(struct mlx5_eswitch *esw,
}
mlx5_eswitch_disable(esw, false);
- mlx5_eswitch_update_num_of_vfs(esw, esw->dev->priv.sriov.num_vfs);
- err = mlx5_eswitch_enable(esw, MLX5_ESWITCH_OFFLOADS);
+ err = mlx5_eswitch_enable(esw, MLX5_ESWITCH_OFFLOADS,
+ esw->dev->priv.sriov.num_vfs);
if (err) {
NL_SET_ERR_MSG_MOD(extack,
"Failed setting eswitch to offloads");
- err1 = mlx5_eswitch_enable(esw, MLX5_ESWITCH_LEGACY);
+ err1 = mlx5_eswitch_enable(esw, MLX5_ESWITCH_LEGACY,
+ MLX5_ESWITCH_IGNORE_NUM_VFS);
if (err1) {
NL_SET_ERR_MSG_MOD(extack,
"Failed setting eswitch back to legacy");
@@ -2473,10 +2474,12 @@ static int esw_offloads_stop(struct mlx5_eswitch *esw,
int err, err1;
mlx5_eswitch_disable(esw, false);
- err = mlx5_eswitch_enable(esw, MLX5_ESWITCH_LEGACY);
+ err = mlx5_eswitch_enable(esw, MLX5_ESWITCH_LEGACY,
+ MLX5_ESWITCH_IGNORE_NUM_VFS);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Failed setting eswitch to legacy");
- err1 = mlx5_eswitch_enable(esw, MLX5_ESWITCH_OFFLOADS);
+ err1 = mlx5_eswitch_enable(esw, MLX5_ESWITCH_OFFLOADS,
+ MLX5_ESWITCH_IGNORE_NUM_VFS);
if (err1) {
NL_SET_ERR_MSG_MOD(extack,
"Failed setting eswitch back to offloads");
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
index 03f037811f1d..10a64b91d04c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
@@ -77,8 +77,8 @@ static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
if (!MLX5_ESWITCH_MANAGER(dev))
goto enable_vfs_hca;
- mlx5_eswitch_update_num_of_vfs(dev->priv.eswitch, num_vfs);
- err = mlx5_eswitch_enable(dev->priv.eswitch, MLX5_ESWITCH_LEGACY);
+ err = mlx5_eswitch_enable(dev->priv.eswitch, MLX5_ESWITCH_LEGACY,
+ num_vfs);
if (err) {
mlx5_core_warn(dev,
"failed to enable eswitch SRIOV (%d)\n", err);
--
2.13.6
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