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Message-ID: <20240307084229.500776-5-saeed@kernel.org>
Date: Thu, 7 Mar 2024 00:42:18 -0800
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
netdev@...r.kernel.org,
Tariq Toukan <tariqt@...dia.com>,
Gal Pressman <gal@...dia.com>,
Leon Romanovsky <leonro@...dia.com>
Subject: [net-next V6 04/15] net/mlx5: SD, Implement devcom communication and primary election
From: Tariq Toukan <tariqt@...dia.com>
Use devcom to communicate between the different devices. Add a new
devcom component type for this.
Each device registers itself to the devcom component <SD, group ID>.
Once all devices of a component are registered, the component becomes
ready, and a primary device is elected.
In principle, any of the devices can act as a primary, they are all
capable, and a random election would've worked. However, we aim to
achieve predictability and consistency, hence each group always choses
the same device, with the lowest PCI BUS number, as primary.
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
.../ethernet/mellanox/mlx5/core/lib/devcom.h | 1 +
.../net/ethernet/mellanox/mlx5/core/lib/sd.c | 122 +++++++++++++++++-
2 files changed, 121 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
index ec32b686f586..d58032dd0df7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -10,6 +10,7 @@ enum mlx5_devcom_component {
MLX5_DEVCOM_ESW_OFFLOADS,
MLX5_DEVCOM_MPV,
MLX5_DEVCOM_HCA_PORTS,
+ MLX5_DEVCOM_SD_GROUP,
MLX5_DEVCOM_NUM_COMPONENTS,
};
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
index b1f86549af1c..3059a3750f82 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
@@ -14,6 +14,16 @@
struct mlx5_sd {
u32 group_id;
u8 host_buses;
+ struct mlx5_devcom_comp_dev *devcom;
+ bool primary;
+ union {
+ struct { /* primary */
+ struct mlx5_core_dev *secondaries[MLX5_SD_MAX_GROUP_SZ - 1];
+ };
+ struct { /* secondary */
+ struct mlx5_core_dev *primary_dev;
+ };
+ };
};
static int mlx5_sd_get_host_buses(struct mlx5_core_dev *dev)
@@ -26,13 +36,29 @@ static int mlx5_sd_get_host_buses(struct mlx5_core_dev *dev)
return sd->host_buses;
}
+static struct mlx5_core_dev *mlx5_sd_get_primary(struct mlx5_core_dev *dev)
+{
+ struct mlx5_sd *sd = mlx5_get_sd(dev);
+
+ if (!sd)
+ return dev;
+
+ return sd->primary ? dev : sd->primary_dev;
+}
+
struct mlx5_core_dev *
mlx5_sd_primary_get_peer(struct mlx5_core_dev *primary, int idx)
{
+ struct mlx5_sd *sd;
+
if (idx == 0)
return primary;
- return NULL;
+ if (idx >= mlx5_sd_get_host_buses(primary))
+ return NULL;
+
+ sd = mlx5_get_sd(primary);
+ return sd->secondaries[idx - 1];
}
int mlx5_sd_ch_ix_get_dev_ix(struct mlx5_core_dev *dev, int ch_ix)
@@ -139,15 +165,93 @@ static void sd_cleanup(struct mlx5_core_dev *dev)
kfree(sd);
}
+static int sd_register(struct mlx5_core_dev *dev)
+{
+ struct mlx5_devcom_comp_dev *devcom, *pos;
+ struct mlx5_core_dev *peer, *primary;
+ struct mlx5_sd *sd, *primary_sd;
+ int err, i;
+
+ sd = mlx5_get_sd(dev);
+ devcom = mlx5_devcom_register_component(dev->priv.devc, MLX5_DEVCOM_SD_GROUP,
+ sd->group_id, NULL, dev);
+ if (!devcom)
+ return -ENOMEM;
+
+ sd->devcom = devcom;
+
+ if (mlx5_devcom_comp_get_size(devcom) != sd->host_buses)
+ return 0;
+
+ mlx5_devcom_comp_lock(devcom);
+ mlx5_devcom_comp_set_ready(devcom, true);
+ mlx5_devcom_comp_unlock(devcom);
+
+ if (!mlx5_devcom_for_each_peer_begin(devcom)) {
+ err = -ENODEV;
+ goto err_devcom_unreg;
+ }
+
+ primary = dev;
+ mlx5_devcom_for_each_peer_entry(devcom, peer, pos)
+ if (peer->pdev->bus->number < primary->pdev->bus->number)
+ primary = peer;
+
+ primary_sd = mlx5_get_sd(primary);
+ primary_sd->primary = true;
+ i = 0;
+ /* loop the secondaries */
+ mlx5_devcom_for_each_peer_entry(primary_sd->devcom, peer, pos) {
+ struct mlx5_sd *peer_sd = mlx5_get_sd(peer);
+
+ primary_sd->secondaries[i++] = peer;
+ peer_sd->primary = false;
+ peer_sd->primary_dev = primary;
+ }
+
+ mlx5_devcom_for_each_peer_end(devcom);
+ return 0;
+
+err_devcom_unreg:
+ mlx5_devcom_comp_lock(sd->devcom);
+ mlx5_devcom_comp_set_ready(sd->devcom, false);
+ mlx5_devcom_comp_unlock(sd->devcom);
+ mlx5_devcom_unregister_component(sd->devcom);
+ return err;
+}
+
+static void sd_unregister(struct mlx5_core_dev *dev)
+{
+ struct mlx5_sd *sd = mlx5_get_sd(dev);
+
+ mlx5_devcom_comp_lock(sd->devcom);
+ mlx5_devcom_comp_set_ready(sd->devcom, false);
+ mlx5_devcom_comp_unlock(sd->devcom);
+ mlx5_devcom_unregister_component(sd->devcom);
+}
+
int mlx5_sd_init(struct mlx5_core_dev *dev)
{
+ struct mlx5_sd *sd = mlx5_get_sd(dev);
int err;
err = sd_init(dev);
if (err)
return err;
+ sd = mlx5_get_sd(dev);
+ if (!sd)
+ return 0;
+
+ err = sd_register(dev);
+ if (err)
+ goto err_sd_cleanup;
+
return 0;
+
+err_sd_cleanup:
+ sd_cleanup(dev);
+ return err;
}
void mlx5_sd_cleanup(struct mlx5_core_dev *dev)
@@ -157,6 +261,7 @@ void mlx5_sd_cleanup(struct mlx5_core_dev *dev)
if (!sd)
return;
+ sd_unregister(dev);
sd_cleanup(dev);
}
@@ -164,5 +269,18 @@ struct auxiliary_device *mlx5_sd_get_adev(struct mlx5_core_dev *dev,
struct auxiliary_device *adev,
int idx)
{
- return adev;
+ struct mlx5_sd *sd = mlx5_get_sd(dev);
+ struct mlx5_core_dev *primary;
+
+ if (!sd)
+ return adev;
+
+ if (!mlx5_devcom_comp_is_ready(sd->devcom))
+ return NULL;
+
+ primary = mlx5_sd_get_primary(dev);
+ if (dev == primary)
+ return adev;
+
+ return &primary->priv.adev[idx]->adev;
}
--
2.44.0
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