From 4cbeaff54f00f39493c4251bf115d02e26ac8bf2 Mon Sep 17 00:00:00 2001 From: Achiad Shochat Date: Tue, 4 Aug 2015 14:05:40 +0300 Subject: [PATCH] net/mlx5e: Unify the RX flow Generally an RX packet flows through the following objects: Flow table --> TIR --> RQT --> RQ Where: - TIR stands for "Transport Interface Receive", defining the RSS and LRO paramaters. - RQT stands for "RQ Table", implementing the RSS indirection table. - RQ stands for "Receive Queue" For flows that do not need LRO, nor RSS, the driver made a shortcut to the above RX flow by pointing to the RQ directly from the TIR, yielding this flow: Flow table --> TIR --> RQ In this commit we remove this shortcut by "inserting" a single-RQ RQT between the TIR and the RQ, i.e RX packets will reach the same RQ but will go through an RQT of size 1, pointing to just a single RQ. This way the RX traffic re-direction to/from the "Drop RQ" will be more uniform (AKA "one flow"), as it will involve only RQTs re-direction and no TIRs re-direction. Signed-off-by: Achiad Shochat Signed-off-by: Amir Vadai Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx5/core/en.h | 10 +- .../net/ethernet/mellanox/mlx5/core/en_main.c | 93 +++++++++++++------ 2 files changed, 69 insertions(+), 34 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h index 45f6dc75c0df..af5791296584 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h @@ -344,10 +344,10 @@ enum mlx5e_traffic_types { MLX5E_NUM_TT, }; -enum { - MLX5E_RQT_SPREADING = 0, - MLX5E_RQT_DEFAULT_RQ = 1, - MLX5E_NUM_RQT = 2, +enum mlx5e_rqt_ix { + MLX5E_INDIRECTION_RQT, + MLX5E_SINGLE_RQ_RQT, + MLX5E_NUM_RQT, }; struct mlx5e_eth_addr_info { @@ -402,7 +402,7 @@ struct mlx5e_priv { struct mlx5e_channel **channel; u32 tisn[MLX5E_MAX_NUM_TC]; - u32 rqtn; + u32 rqtn[MLX5E_NUM_RQT]; u32 tirn[MLX5E_NUM_TT]; struct mlx5e_flow_table ft; diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index bb815893d3a8..333c828c56da 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -1184,16 +1184,49 @@ static int mlx5e_bits_invert(unsigned long a, int size) return inv; } -static int mlx5e_open_rqt(struct mlx5e_priv *priv) +static void mlx5e_fill_rqt_rqns(struct mlx5e_priv *priv, void *rqtc, + enum mlx5e_rqt_ix rqt_ix) +{ + int i; + int log_sz; + + switch (rqt_ix) { + case MLX5E_INDIRECTION_RQT: + log_sz = priv->params.rx_hash_log_tbl_sz; + for (i = 0; i < (1 << log_sz); i++) { + int ix = i; + + if (priv->params.rss_hfunc == ETH_RSS_HASH_XOR) + ix = mlx5e_bits_invert(i, log_sz); + + ix = ix % priv->params.num_channels; + MLX5_SET(rqtc, rqtc, rq_num[i], + priv->channel[ix]->rq.rqn); + } + + break; + + default: /* MLX5E_SINGLE_RQ_RQT */ + MLX5_SET(rqtc, rqtc, rq_num[0], + priv->channel[0]->rq.rqn); + + break; + } +} + +static int mlx5e_open_rqt(struct mlx5e_priv *priv, enum mlx5e_rqt_ix rqt_ix) { struct mlx5_core_dev *mdev = priv->mdev; u32 *in; void *rqtc; int inlen; + int log_sz; + int sz; int err; - int log_tbl_sz = priv->params.rx_hash_log_tbl_sz; - int sz = 1 << log_tbl_sz; - int i; + + log_sz = (rqt_ix == MLX5E_SINGLE_RQ_RQT) ? 0 : + priv->params.rx_hash_log_tbl_sz; + sz = 1 << log_sz; inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + sizeof(u32) * sz; in = mlx5_vzalloc(inlen); @@ -1205,26 +1238,18 @@ static int mlx5e_open_rqt(struct mlx5e_priv *priv) MLX5_SET(rqtc, rqtc, rqt_actual_size, sz); MLX5_SET(rqtc, rqtc, rqt_max_size, sz); - for (i = 0; i < sz; i++) { - int ix = i; + mlx5e_fill_rqt_rqns(priv, rqtc, rqt_ix); - if (priv->params.rss_hfunc == ETH_RSS_HASH_XOR) - ix = mlx5e_bits_invert(i, log_tbl_sz); - - ix = ix % priv->params.num_channels; - MLX5_SET(rqtc, rqtc, rq_num[i], priv->channel[ix]->rq.rqn); - } - - err = mlx5_core_create_rqt(mdev, in, inlen, &priv->rqtn); + err = mlx5_core_create_rqt(mdev, in, inlen, &priv->rqtn[rqt_ix]); kvfree(in); return err; } -static void mlx5e_close_rqt(struct mlx5e_priv *priv) +static void mlx5e_close_rqt(struct mlx5e_priv *priv, enum mlx5e_rqt_ix rqt_ix) { - mlx5_core_destroy_rqt(priv->mdev, priv->rqtn); + mlx5_core_destroy_rqt(priv->mdev, priv->rqtn[rqt_ix]); } static void mlx5e_build_tir_ctx(struct mlx5e_priv *priv, u32 *tirc, int tt) @@ -1259,18 +1284,17 @@ static void mlx5e_build_tir_ctx(struct mlx5e_priv *priv, u32 *tirc, int tt) lro_timer_supported_periods[3])); } + MLX5_SET(tirc, tirc, disp_type, MLX5_TIRC_DISP_TYPE_INDIRECT); + switch (tt) { case MLX5E_TT_ANY: - MLX5_SET(tirc, tirc, disp_type, - MLX5_TIRC_DISP_TYPE_DIRECT); - MLX5_SET(tirc, tirc, inline_rqn, - priv->channel[0]->rq.rqn); + MLX5_SET(tirc, tirc, indirect_table, + priv->rqtn[MLX5E_SINGLE_RQ_RQT]); + MLX5_SET(tirc, tirc, rx_hash_fn, MLX5_RX_HASH_FN_INVERTED_XOR8); break; default: - MLX5_SET(tirc, tirc, disp_type, - MLX5_TIRC_DISP_TYPE_INDIRECT); MLX5_SET(tirc, tirc, indirect_table, - priv->rqtn); + priv->rqtn[MLX5E_INDIRECTION_RQT]); MLX5_SET(tirc, tirc, rx_hash_fn, mlx5e_rx_hash_fn(priv->params.rss_hfunc)); if (priv->params.rss_hfunc == ETH_RSS_HASH_TOP) { @@ -1472,18 +1496,25 @@ int mlx5e_open_locked(struct net_device *netdev) goto err_close_tises; } - err = mlx5e_open_rqt(priv); + err = mlx5e_open_rqt(priv, MLX5E_INDIRECTION_RQT); if (err) { - netdev_err(netdev, "%s: mlx5e_open_rqt failed, %d\n", + netdev_err(netdev, "%s: mlx5e_open_rqt(INDIR) failed, %d\n", __func__, err); goto err_close_channels; } + err = mlx5e_open_rqt(priv, MLX5E_SINGLE_RQ_RQT); + if (err) { + netdev_err(netdev, "%s: mlx5e_open_rqt(SINGLE) failed, %d\n", + __func__, err); + goto err_close_rqt_indir; + } + err = mlx5e_open_tirs(priv); if (err) { netdev_err(netdev, "%s: mlx5e_open_tir failed, %d\n", __func__, err); - goto err_close_rqls; + goto err_close_rqt_single; } err = mlx5e_open_flow_table(priv); @@ -1516,8 +1547,11 @@ int mlx5e_open_locked(struct net_device *netdev) err_close_tirs: mlx5e_close_tirs(priv); -err_close_rqls: - mlx5e_close_rqt(priv); +err_close_rqt_single: + mlx5e_close_rqt(priv, MLX5E_SINGLE_RQ_RQT); + +err_close_rqt_indir: + mlx5e_close_rqt(priv, MLX5E_INDIRECTION_RQT); err_close_channels: mlx5e_close_channels(priv); @@ -1551,7 +1585,8 @@ int mlx5e_close_locked(struct net_device *netdev) netif_carrier_off(priv->netdev); mlx5e_close_flow_table(priv); mlx5e_close_tirs(priv); - mlx5e_close_rqt(priv); + mlx5e_close_rqt(priv, MLX5E_SINGLE_RQ_RQT); + mlx5e_close_rqt(priv, MLX5E_INDIRECTION_RQT); mlx5e_close_channels(priv); mlx5e_close_tises(priv); -- GitLab