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net/mlx5e: Allow reporting of checksum unnecessary 

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.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Or Gerlitz 2018-07-01 08:58:38 +00:00 committed by Saeed Mahameed
parent b820e6fb09
commit b856df28f9
4 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/mellanox/mlx5/core/en.h
View File

@ -209,6 +209,7 @@ 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) \
@ -290,6 +291,7 @@ struct mlx5e_dcbx_dp {
enum {
MLX5E_RQ_STATE_ENABLED,
MLX5E_RQ_STATE_AM,
MLX5E_RQ_STATE_NO_CSUM_COMPLETE,
};
struct mlx5e_cq {

28
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
View File

@ -140,6 +140,7 @@ static const char mlx5e_priv_flags[][ETH_GSTRING_LEN] = {
"tx_cqe_moder",
"rx_cqe_compress",
"rx_striding_rq",
"rx_no_csum_complete",
};
int mlx5e_ethtool_get_sset_count(struct mlx5e_priv *priv, int sset)
@ -1531,6 +1532,27 @@ 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,
@ -1582,6 +1604,12 @@ 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);

4
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View File

@ -929,6 +929,9 @@ 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:
@ -4528,6 +4531,7 @@ 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 */
mlx5e_build_rq_params(mdev, params);

3
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View File

@ -782,6 +782,9 @@ 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;
if (likely(is_last_ethertype_ip(skb, &network_depth, &proto))) {
if (unlikely(get_ip_proto(skb, proto) == IPPROTO_SCTP))
goto csum_unnecessary;