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Date: Mon, 23 Sep 2019 12:40:16 +0000
From: Saeed Mahameed <saeedm@...lanox.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"stable@...r.kernel.org" <stable@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Or Gerlitz <ogerlitz@...lanox.com>,
Tariq Toukan <tariqt@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>
Subject: [PATCH 4.19-stable 4/7] net/mlx5e: Allow reporting of checksum
unnecessary
From: Or Gerlitz <ogerlitz@...lanox.com>
[ Upstream commit b856df28f9230a47669efbdd57896084caadb2b3 ]
Currently we practically never report checksum unnecessary, because
for all IP packets we take the checksum complete path.
Enable non-default runs with reprorting checksum unnecessary, using
an ethtool private flag. This can be useful for performance evals
and other explorations.
Required by downstream patch which fixes XDP checksum.
Fixes: 86994156c736 ("net/mlx5e: XDP fast RX drop bpf programs support")
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 3 +++
.../ethernet/mellanox/mlx5/core/en_ethtool.c | 27 +++++++++++++++++++
.../net/ethernet/mellanox/mlx5/core/en_main.c | 4 +++
.../net/ethernet/mellanox/mlx5/core/en_rx.c | 3 +++
4 files changed, 37 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index da52e60d4437..d79e177f8990 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -210,6 +210,7 @@ static const char mlx5e_priv_flags[][ETH_GSTRING_LEN] = {
"tx_cqe_moder",
"rx_cqe_compress",
"rx_striding_rq",
+ "rx_no_csum_complete",
};
enum mlx5e_priv_flag {
@@ -217,6 +218,7 @@ enum mlx5e_priv_flag {
MLX5E_PFLAG_TX_CQE_BASED_MODER = (1 << 1),
MLX5E_PFLAG_RX_CQE_COMPRESS = (1 << 2),
MLX5E_PFLAG_RX_STRIDING_RQ = (1 << 3),
+ MLX5E_PFLAG_RX_NO_CSUM_COMPLETE = (1 << 4),
};
#define MLX5E_SET_PFLAG(params, pflag, enable) \
@@ -298,6 +300,7 @@ struct mlx5e_dcbx_dp {
enum {
MLX5E_RQ_STATE_ENABLED,
MLX5E_RQ_STATE_AM,
+ MLX5E_RQ_STATE_NO_CSUM_COMPLETE,
};
struct mlx5e_cq {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 2b9350f4c752..cb79aaea1a69 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -1510,6 +1510,27 @@ static int set_pflag_rx_striding_rq(struct net_device *netdev, bool enable)
return 0;
}
+static int set_pflag_rx_no_csum_complete(struct net_device *netdev, bool enable)
+{
+ struct mlx5e_priv *priv = netdev_priv(netdev);
+ struct mlx5e_channels *channels = &priv->channels;
+ struct mlx5e_channel *c;
+ int i;
+
+ if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
+ return 0;
+
+ for (i = 0; i < channels->num; i++) {
+ c = channels->c[i];
+ if (enable)
+ __set_bit(MLX5E_RQ_STATE_NO_CSUM_COMPLETE, &c->rq.state);
+ else
+ __clear_bit(MLX5E_RQ_STATE_NO_CSUM_COMPLETE, &c->rq.state);
+ }
+
+ return 0;
+}
+
static int mlx5e_handle_pflag(struct net_device *netdev,
u32 wanted_flags,
enum mlx5e_priv_flag flag,
@@ -1561,6 +1582,12 @@ static int mlx5e_set_priv_flags(struct net_device *netdev, u32 pflags)
err = mlx5e_handle_pflag(netdev, pflags,
MLX5E_PFLAG_RX_STRIDING_RQ,
set_pflag_rx_striding_rq);
+ if (err)
+ goto out;
+
+ err = mlx5e_handle_pflag(netdev, pflags,
+ MLX5E_PFLAG_RX_NO_CSUM_COMPLETE,
+ set_pflag_rx_no_csum_complete);
out:
mutex_unlock(&priv->state_lock);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 83ab2c0e6b61..5e98b31620c1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -934,6 +934,9 @@ static int mlx5e_open_rq(struct mlx5e_channel *c,
if (params->rx_dim_enabled)
__set_bit(MLX5E_RQ_STATE_AM, &c->rq.state);
+ if (params->pflags & MLX5E_PFLAG_RX_NO_CSUM_COMPLETE)
+ __set_bit(MLX5E_RQ_STATE_NO_CSUM_COMPLETE, &c->rq.state);
+
return 0;
err_destroy_rq:
@@ -4533,6 +4536,7 @@ void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
params->rx_cqe_compress_def = slow_pci_heuristic(mdev);
MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_CQE_COMPRESS, params->rx_cqe_compress_def);
+ MLX5E_SET_PFLAG(params, MLX5E_PFLAG_RX_NO_CSUM_COMPLETE, false);
/* RQ */
/* Prefer Striding RQ, unless any of the following holds:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 8323534f075a..4851fc575185 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -754,6 +754,9 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
return;
}
+ if (unlikely(test_bit(MLX5E_RQ_STATE_NO_CSUM_COMPLETE, &rq->state)))
+ goto csum_unnecessary;
+
/* CQE csum doesn't cover padding octets in short ethernet
* frames. And the pad field is appended prior to calculating
* and appending the FCS field.
--
2.21.0
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