[PATCH rdma-next 0/3] Add raw ethernet local loopback

[PATCH rdma-next 0/3] Add raw ethernet local loopback

[Leon Romanovsky]

Hi Doug,

The following patch set from Huy adds ability to disable/enable
raw ethernet loopbacks based on actual number of user contexts.

The one or less user space context simply says that no actual consumer
of this packets and they don't need to be forwarded to the vport.

After this patch set, the raw ethernet unicast and multicast
local loopbacks are disabled by default and packets are forwarded
to the next routing level (eswitch, or multihost switch, or out to the
wire depending on the configuration).

Available in the "topic/local_lb" topic branch of this git repo:
git://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git

Or for browsing:
https://git.kernel.org/cgit/linux/kernel/git/leon/linux-rdma.git/log/?h=topic/local_lb

Possible merge conflicts resolution is available in:
https://git.kernel.org/cgit/linux/kernel/git/leon/linux-rdma.git/log/?h=testing/queue-next

Huy Nguyen (3):
  net/mlx5: Add raw ethernet local loopback firmware command
  IB/mlx5: Add raw ethernet local loopback support
  net/mlx5e: Enable local loopback in loopback selftest

 drivers/infiniband/hw/mlx5/main.c                  | 51 ++++++++++++++++--
 drivers/infiniband/hw/mlx5/mlx5_ib.h               |  4 ++
 .../net/ethernet/mellanox/mlx5/core/en_selftest.c  | 13 +++++
 drivers/net/ethernet/mellanox/mlx5/core/main.c     | 19 +++++++
 drivers/net/ethernet/mellanox/mlx5/core/vport.c    | 62 ++++++++++++++++++++++
 include/linux/mlx5/mlx5_ifc.h                      | 11 ++--
 include/linux/mlx5/vport.h                         |  3 +-
 7 files changed, 155 insertions(+), 8 deletions(-)

--
2.12.2

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[PATCH rdma-next 1/3] net/mlx5: Add raw ethernet local loopback firmware command

[Leon Romanovsky]

From: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Add support for raw ethernet local loopback firmware command.

Signed-off-by: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Daniel Jurgens <danielj-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/vport.c | 62 +++++++++++++++++++++++++
 include/linux/mlx5/mlx5_ifc.h                   | 11 +++--
 include/linux/mlx5/vport.h                      |  3 +-
 3 files changed, 72 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
index 15c2294dd2b4..3eaa4aac13dd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c
@@ -901,6 +901,68 @@ int mlx5_modify_nic_vport_promisc(struct mlx5_core_dev *mdev,
 }
 EXPORT_SYMBOL_GPL(mlx5_modify_nic_vport_promisc);
 
+enum {
+	UC_LOCAL_LB,
+	MC_LOCAL_LB
+};
+
+int mlx5_nic_vport_update_local_lb(struct mlx5_core_dev *mdev, bool enable)
+{
+	int inlen = MLX5_ST_SZ_BYTES(modify_nic_vport_context_in);
+	void *in;
+	int err;
+
+	mlx5_core_dbg(mdev, "%s local_lb\n", enable ? "enable" : "disable");
+	in = kvzalloc(inlen, GFP_KERNEL);
+	if (!in)
+		return -ENOMEM;
+
+	MLX5_SET(modify_nic_vport_context_in, in,
+		 field_select.disable_mc_local_lb, 1);
+	MLX5_SET(modify_nic_vport_context_in, in,
+		 nic_vport_context.disable_mc_local_lb, !enable);
+
+	MLX5_SET(modify_nic_vport_context_in, in,
+		 field_select.disable_uc_local_lb, 1);
+	MLX5_SET(modify_nic_vport_context_in, in,
+		 nic_vport_context.disable_uc_local_lb, !enable);
+
+	err = mlx5_modify_nic_vport_context(mdev, in, inlen);
+
+	kvfree(in);
+	return err;
+}
+EXPORT_SYMBOL_GPL(mlx5_nic_vport_update_local_lb);
+
+int mlx5_nic_vport_query_local_lb(struct mlx5_core_dev *mdev, bool *status)
+{
+	int outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);
+	u32 *out;
+	int value;
+	int err;
+
+	out = kzalloc(outlen, GFP_KERNEL);
+	if (!out)
+		return -ENOMEM;
+
+	err = mlx5_query_nic_vport_context(mdev, 0, out, outlen);
+	if (err)
+		goto out;
+
+	value = MLX5_GET(query_nic_vport_context_out, out,
+			 nic_vport_context.disable_mc_local_lb) << MC_LOCAL_LB;
+
+	value |= MLX5_GET(query_nic_vport_context_out, out,
+			  nic_vport_context.disable_uc_local_lb) << UC_LOCAL_LB;
+
+	*status = !value;
+
+out:
+	kfree(out);
+	return err;
+}
+EXPORT_SYMBOL_GPL(mlx5_nic_vport_query_local_lb);
+
 enum mlx5_vport_roce_state {
 	MLX5_VPORT_ROCE_DISABLED = 0,
 	MLX5_VPORT_ROCE_ENABLED  = 1,
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 32de0724b400..d55076bb4646 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -994,7 +994,8 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         log_max_wq_sz[0x5];
 
 	u8         nic_vport_change_event[0x1];
-	u8         reserved_at_3e1[0xa];
+	u8         disable_local_lb[0x1];
+	u8         reserved_at_3e2[0x9];
 	u8         log_max_vlan_list[0x5];
 	u8         reserved_at_3f0[0x3];
 	u8         log_max_current_mc_list[0x5];
@@ -2538,7 +2539,9 @@ struct mlx5_ifc_rmpc_bits {
 struct mlx5_ifc_nic_vport_context_bits {
 	u8         reserved_at_0[0x5];
 	u8         min_wqe_inline_mode[0x3];
-	u8         reserved_at_8[0x17];
+	u8         reserved_at_8[0x15];
+	u8         disable_mc_local_lb[0x1];
+	u8         disable_uc_local_lb[0x1];
 	u8         roce_en[0x1];
 
 	u8         arm_change_event[0x1];
@@ -5197,7 +5200,9 @@ struct mlx5_ifc_modify_nic_vport_context_out_bits {
 };
 
 struct mlx5_ifc_modify_nic_vport_field_select_bits {
-	u8         reserved_at_0[0x16];
+	u8         reserved_at_0[0x14];
+	u8         disable_uc_local_lb[0x1];
+	u8         disable_mc_local_lb[0x1];
 	u8         node_guid[0x1];
 	u8         port_guid[0x1];
 	u8         min_inline[0x1];
diff --git a/include/linux/mlx5/vport.h b/include/linux/mlx5/vport.h
index 656c70b65dd2..aaa0bb9e7655 100644
--- a/include/linux/mlx5/vport.h
+++ b/include/linux/mlx5/vport.h
@@ -114,5 +114,6 @@ int mlx5_core_modify_hca_vport_context(struct mlx5_core_dev *dev,
 				       u8 other_vport, u8 port_num,
 				       int vf,
 				       struct mlx5_hca_vport_context *req);
-
+int mlx5_nic_vport_update_local_lb(struct mlx5_core_dev *mdev, bool enable);
+int mlx5_nic_vport_query_local_lb(struct mlx5_core_dev *mdev, bool *status);
 #endif /* __MLX5_VPORT_H__ */
-- 
2.12.2

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[PATCH rdma-next 2/3] IB/mlx5: Add raw ethernet local loopback support

[Leon Romanovsky]

From: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Currently, unicast/multicast loopback raw ethernet
(non-RDMA) packets are sent back to the vport.
A unicast loopback packet is the packet with destination
MAC address the same as the source MAC address.
For multicast, the destination MAC address is in the
vport's multicast filter list.

Moreover, the local loopback is not needed if
there is one or none user space context.

After this patch, the raw ethernet unicast and multicast
local loopback are disabled by default. When there is more
than one user space context, the local loopback is enabled.

Note that when local loopback is disabled, raw ethernet
packets are not looped back to the vport and are forwarded
to the next routing level (eswitch, or multihost switch,
or out to the wire depending on the configuration).

Signed-off-by: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Daniel Jurgens <danielj-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/infiniband/hw/mlx5/main.c              | 51 ++++++++++++++++++++++++--
 drivers/infiniband/hw/mlx5/mlx5_ib.h           |  4 ++
 drivers/net/ethernet/mellanox/mlx5/core/main.c | 19 ++++++++++
 3 files changed, 70 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index d45772da0963..69412baf2bf9 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -58,6 +58,7 @@
 #include <linux/mlx5/vport.h>
 #include "mlx5_ib.h"
 #include "cmd.h"
+#include <linux/mlx5/vport.h>

 #define DRIVER_NAME "mlx5_ib"
 #define DRIVER_VERSION "2.2-1"
@@ -1201,6 +1202,45 @@ static int deallocate_uars(struct mlx5_ib_dev *dev, struct mlx5_ib_ucontext *con
 	return 0;
 }

+static int mlx5_ib_alloc_transport_domain(struct mlx5_ib_dev *dev, u32 *tdn)
+{
+	int err;
+
+	err = mlx5_core_alloc_transport_domain(dev->mdev, tdn);
+	if (err)
+		return err;
+
+	if ((MLX5_CAP_GEN(dev->mdev, port_type) != MLX5_CAP_PORT_TYPE_ETH) ||
+	    !MLX5_CAP_GEN(dev->mdev, disable_local_lb))
+		return err;
+
+	mutex_lock(&dev->lb_mutex);
+	dev->user_td++;
+
+	if (dev->user_td == 2)
+		err = mlx5_nic_vport_update_local_lb(dev->mdev, true);
+
+	mutex_unlock(&dev->lb_mutex);
+	return err;
+}
+
+static void mlx5_ib_dealloc_transport_domain(struct mlx5_ib_dev *dev, u32 tdn)
+{
+	mlx5_core_dealloc_transport_domain(dev->mdev, tdn);
+
+	if ((MLX5_CAP_GEN(dev->mdev, port_type) != MLX5_CAP_PORT_TYPE_ETH) ||
+	    !MLX5_CAP_GEN(dev->mdev, disable_local_lb))
+		return;
+
+	mutex_lock(&dev->lb_mutex);
+	dev->user_td--;
+
+	if (dev->user_td < 2)
+		mlx5_nic_vport_update_local_lb(dev->mdev, false);
+
+	mutex_unlock(&dev->lb_mutex);
+}
+
 static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
 						  struct ib_udata *udata)
 {
@@ -1309,8 +1349,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
 	mutex_init(&context->upd_xlt_page_mutex);

 	if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain)) {
-		err = mlx5_core_alloc_transport_domain(dev->mdev,
-						       &context->tdn);
+		err = mlx5_ib_alloc_transport_domain(dev, &context->tdn);
 		if (err)
 			goto out_page;
 	}
@@ -1376,7 +1415,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,

 out_td:
 	if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))
-		mlx5_core_dealloc_transport_domain(dev->mdev, context->tdn);
+		mlx5_ib_dealloc_transport_domain(dev, context->tdn);

 out_page:
 	free_page(context->upd_xlt_page);
@@ -1404,7 +1443,7 @@ static int mlx5_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)

 	bfregi = &context->bfregi;
 	if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))
-		mlx5_core_dealloc_transport_domain(dev->mdev, context->tdn);
+		mlx5_ib_dealloc_transport_domain(dev, context->tdn);

 	free_page(context->upd_xlt_page);
 	deallocate_uars(dev, context);
@@ -3788,6 +3827,10 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
 			goto err_umrc;
 	}

+	if ((MLX5_CAP_GEN(mdev, port_type) == MLX5_CAP_PORT_TYPE_ETH) &&
+	    MLX5_CAP_GEN(mdev, disable_local_lb))
+		mutex_init(&dev->lb_mutex);
+
 	dev->ib_active = true;

 	return dev;
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 38c877bc45e5..a6a563b9c92c 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -654,6 +654,10 @@ struct mlx5_ib_dev {
 	struct mlx5_ib_port	*port;
 	struct mlx5_sq_bfreg     bfreg;
 	struct mlx5_sq_bfreg     fp_bfreg;
+
+	/* protect the user_td */
+	struct mutex             lb_mutex;
+	u32                      user_td;
 };

 static inline struct mlx5_ib_cq *to_mibcq(struct mlx5_core_cq *mcq)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 0c123d571b4c..1cafcae97aea 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -47,6 +47,7 @@
 #include <linux/debugfs.h>
 #include <linux/kmod.h>
 #include <linux/mlx5/mlx5_ifc.h>
+#include <linux/mlx5/vport.h>
 #ifdef CONFIG_RFS_ACCEL
 #include <linux/cpu_rmap.h>
 #endif
@@ -574,6 +575,18 @@ static int set_hca_ctrl(struct mlx5_core_dev *dev)
 	return err;
 }

+static int mlx5_core_set_hca_defaults(struct mlx5_core_dev *dev)
+{
+	int ret = 0;
+
+	/* Disable local_lb by default */
+	if ((MLX5_CAP_GEN(dev, port_type) == MLX5_CAP_PORT_TYPE_ETH) &&
+	    MLX5_CAP_GEN(dev, disable_local_lb))
+		ret = mlx5_nic_vport_update_local_lb(dev, false);
+
+	return ret;
+}
+
 int mlx5_core_enable_hca(struct mlx5_core_dev *dev, u16 func_id)
 {
 	u32 out[MLX5_ST_SZ_DW(enable_hca_out)] = {0};
@@ -1137,6 +1150,12 @@ static int mlx5_load_one(struct mlx5_core_dev *dev, struct mlx5_priv *priv,
 		goto err_fs;
 	}

+	err = mlx5_core_set_hca_defaults(dev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to set hca defaults\n");
+		goto err_fs;
+	}
+
 #ifdef CONFIG_MLX5_CORE_EN
 	mlx5_eswitch_attach(dev->priv.eswitch);
 #endif
--
2.12.2

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[PATCH rdma-next 3/3] net/mlx5e: Enable local loopback in loopback selftest

[Leon Romanovsky]

From: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

Before running the ethtool's loopback selftest, we need
to make sure that the local loopback is enabled.

Signed-off-by: Huy Nguyen <huyn-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Daniel Jurgens <danielj-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
index 5225f2226a67..8a074ad5cf3b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_selftest.c
@@ -189,6 +189,7 @@ struct mlx5e_lbt_priv {
 	struct packet_type pt;
 	struct completion comp;
 	bool loopback_ok;
+	bool local_lb;
 };
 
 static int
@@ -236,6 +237,13 @@ static int mlx5e_test_loopback_setup(struct mlx5e_priv *priv,
 {
 	int err = 0;
 
+	/* Temporarily enable local_lb */
+	if (MLX5_CAP_GEN(priv->mdev, disable_local_lb)) {
+		mlx5_nic_vport_query_local_lb(priv->mdev, &lbtp->local_lb);
+		if (!lbtp->local_lb)
+			mlx5_nic_vport_update_local_lb(priv->mdev, true);
+	}
+
 	err = mlx5e_refresh_tirs(priv, true);
 	if (err)
 		return err;
@@ -254,6 +262,11 @@ static int mlx5e_test_loopback_setup(struct mlx5e_priv *priv,
 static void mlx5e_test_loopback_cleanup(struct mlx5e_priv *priv,
 					struct mlx5e_lbt_priv *lbtp)
 {
+	if (MLX5_CAP_GEN(priv->mdev, disable_local_lb)) {
+		if (!lbtp->local_lb)
+			mlx5_nic_vport_update_local_lb(priv->mdev, false);
+	}
+
 	dev_remove_pack(&lbtp->pt);
 	mlx5e_refresh_tirs(priv, false);
 }
-- 
2.12.2

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Re: [PATCH rdma-next 0/3] Add raw ethernet local loopback

[Doug Ledford]

On Tue, 2017-05-30 at 09:42 +0300, Leon Romanovsky wrote:
> Hi Doug,
> 
> The following patch set from Huy adds ability to disable/enable
> raw ethernet loopbacks based on actual number of user contexts.
> 
> The one or less user space context simply says that no actual
> consumer
> of this packets and they don't need to be forwarded to the vport.
> 
> After this patch set, the raw ethernet unicast and multicast
> local loopbacks are disabled by default and packets are forwarded
> to the next routing level (eswitch, or multihost switch, or out to
> the
> wire depending on the configuration).
> 
> Available in the "topic/local_lb" topic branch of this git repo:
> git://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git

Thanks, applied.

-- 
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    GPG KeyID: B826A3330E572FDD
    Key fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

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