netdev - [PATCH net-next 17/27] net/mlx5: Control CR-space access by different PFs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1547737521-29888-18-git-send-email-eranbe@mellanox.com>
Date:   Thu, 17 Jan 2019 17:05:11 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ariel Almog <ariela@...lanox.com>,
        Aya Levin <ayal@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Moshe Shemesh <moshe@...lanox.com>
Cc:     Feras Daoud <ferasda@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH net-next 17/27] net/mlx5: Control CR-space access by different PFs

From: Feras Daoud <ferasda@...lanox.com>

Since the FW can be shared between different PFs/VFs it is common
that more than one health poll will detected a failure, this can
lead to multiple resets which are unneeded.

The solution is to use a FW locking mechanism using semaphore space
to provide a way to allow only one device to collect the cr-dump and
to issue a sw-reset.

Signed-off-by: Feras Daoud <ferasda@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 .../ethernet/mellanox/mlx5/core/lib/pci_vsc.c | 40 ++++++++++++++++---
 .../ethernet/mellanox/mlx5/core/lib/pci_vsc.h |  8 ++++
 .../ethernet/mellanox/mlx5/core/mlx5_core.h   |  4 ++
 3 files changed, 47 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.c
index 96695365d8ce..4ad06465cccb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.c
@@ -24,11 +24,6 @@
 	pci_write_config_dword((dev)->pdev, (dev)->vsc_addr + (offset), (val))
 #define VSC_MAX_RETRIES 2048
 
-enum mlx5_vsc_state {
-	MLX5_VSC_UNLOCK,
-	MLX5_VSC_LOCK,
-};
-
 enum {
 	VSC_CTRL_OFFSET = 0x4,
 	VSC_COUNTER_OFFSET = 0x8,
@@ -279,3 +274,38 @@ int mlx5_vsc_gw_read_block_fast(struct mlx5_core_dev *dev, u32 *data,
 	}
 	return length;
 }
+
+int mlx5_vsc_sem_set_space(struct mlx5_core_dev *dev, u16 space,
+			   enum mlx5_vsc_state state)
+{
+	u32 data, id = 0;
+	int ret;
+
+	ret = mlx5_vsc_gw_set_space(dev, MLX5_SEMAPHORE_SPACE_DOMAIN, NULL);
+	if (ret) {
+		mlx5_core_warn(dev, "Failed to set gw space %d\n", ret);
+		return ret;
+	}
+
+	if (state == MLX5_VSC_LOCK) {
+		/* Get a unique ID based on the counter */
+		ret = vsc_read(dev, VSC_COUNTER_OFFSET, &id);
+		if (ret)
+			return ret;
+	}
+
+	/* Try to modify lock */
+	ret = mlx5_vsc_gw_write(dev, space, id);
+	if (ret)
+		return ret;
+
+	/* Verify lock was modified */
+	ret = mlx5_vsc_gw_read(dev, space, &data);
+	if (ret)
+		return -EINVAL;
+
+	if (data != id)
+		return -EBUSY;
+
+	return 0;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.h
index c30ff69ffa3e..1f96db9b982b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/pci_vsc.h
@@ -4,6 +4,11 @@
 #ifndef __MLX5_PCI_VSC_H__
 #define __MLX5_PCI_VSC_H__
 
+enum mlx5_vsc_state {
+	MLX5_VSC_UNLOCK,
+	MLX5_VSC_LOCK,
+};
+
 enum {
 	MLX5_VSC_SPACE_SCAN_CRSPACE = 0x7,
 };
@@ -22,4 +27,7 @@ static inline bool mlx5_vsc_accessible(struct mlx5_core_dev *dev)
 	return !!dev->vsc_addr;
 }
 
+int mlx5_vsc_sem_set_space(struct mlx5_core_dev *dev, u16 space,
+			   enum mlx5_vsc_state state);
+
 #endif /* __MLX5_PCI_VSC_H__ */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 29a2a4546fb6..e5350c885ab7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -97,6 +97,10 @@ enum {
 	MLX5_DRIVER_SYND = 0xbadd00de,
 };
 
+enum mlx5_semaphore_space_address {
+	MLX5_SEMAPHORE_SPACE_DOMAIN     = 0xA,
+};
+
 int mlx5_query_hca_caps(struct mlx5_core_dev *dev);
 int mlx5_query_board_id(struct mlx5_core_dev *dev);
 int mlx5_cmd_init_hca(struct mlx5_core_dev *dev, uint32_t *sw_owner_id);
-- 
2.17.1