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Message-ID: <d950f4f6-6581-a99f-3375-c0359d45c9f5@gmail.com>
Date: Tue, 25 Jul 2023 12:59:32 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Joe Damato <jdamato@...tly.com>, netdev@...r.kernel.org,
saeedm@...dia.com, ecree@...arflare.com, andrew@...n.ch,
kuba@...nel.org, davem@...emloft.net, leon@...nel.org,
pabeni@...hat.com, bhutchings@...arflare.com, arnd@...db.de
Cc: linux-kernel@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>
Subject: Re: [net 2/2] net/mlx5: Fix flowhash key set/get for custom RSS
On 23/07/2023 18:06, Joe Damato wrote:
> mlx5 flow hash field retrieval and set only worked on the default
> RSS context, not custom RSS contexts.
>
> For example, before this patch attempting to retrieve the flow hash fields
> for RSS context 1 fails:
>
Hi,
You are adding new driver functionality, please take it through net-next.
> $ sudo ethtool -u eth1 rx-flow-hash tcp4 context 1
> Cannot get RX network flow hashing options: Invalid argument
>
> This patch fixes getting and setting the flow hash fields for contexts
> other than the default context.
>
> Getting the flow hash fields for RSS context 1:
>
> sudo ethtool -u eth1 rx-flow-hash tcp4 context 1
> For RSS context 1:
> TCP over IPV4 flows use these fields for computing Hash flow key:
> IP DA
>
> Now, setting the flash hash fields to a custom value:
>
> sudo ethtool -U eth1 rx-flow-hash tcp4 sdfn context 1
>
> And retrieving them again:
>
> sudo ethtool -u eth1 rx-flow-hash tcp4 context 1
> For RSS context 1:
> TCP over IPV4 flows use these fields for computing Hash flow key:
> IP SA
> IP DA
> L4 bytes 0 & 1 [TCP/UDP src port]
> L4 bytes 2 & 3 [TCP/UDP dst port]
>
> Fixes: f01cc58c18d6 ("net/mlx5e: Support multiple RSS contexts")
> Signed-off-by: Joe Damato <jdamato@...tly.com>
> ---
> .../ethernet/mellanox/mlx5/core/en/rx_res.c | 23 ++++++++++---
> .../ethernet/mellanox/mlx5/core/en/rx_res.h | 5 +--
> .../mellanox/mlx5/core/en_fs_ethtool.c | 33 ++++++++++++++-----
> 3 files changed, 46 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.c b/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.c
> index e1095bc36543..bb189c92e4c0 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.c
> @@ -218,17 +218,32 @@ int mlx5e_rx_res_rss_set_rxfh(struct mlx5e_rx_res *res, u32 rss_idx,
> return mlx5e_rss_set_rxfh(rss, indir, key, hfunc, res->rss_rqns, res->rss_nch);
> }
>
> -u8 mlx5e_rx_res_rss_get_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt)
> +int mlx5e_rx_res_rss_get_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt,
> + u32 rss_idx)
For consistency with other functions, please keep the rss_idx next to
the res argument.
> {
> - struct mlx5e_rss *rss = res->rss[0];
> + struct mlx5e_rss *rss;
> +
> + if (rss_idx >= MLX5E_MAX_NUM_RSS)
> + return -EINVAL;
> +
> + rss = res->rss[rss_idx];
> + if (!rss)
> + return -EINVAL;
return -ENOENT; in this case.
>
> return mlx5e_rss_get_hash_fields(rss, tt);
> }
>
> int mlx5e_rx_res_rss_set_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt,
> - u8 rx_hash_fields)
> + u8 rx_hash_fields, u32 rss_idx)
Same. let rss_idx come as second argument.
> {
> - struct mlx5e_rss *rss = res->rss[0];
> + struct mlx5e_rss *rss;
> +
> + if (rss_idx >= MLX5E_MAX_NUM_RSS)
> + return -EINVAL;
> +
> + rss = res->rss[rss_idx];
> + if (!rss)
> + return -EINVAL;
ENOENT
>
> return mlx5e_rss_set_hash_fields(rss, tt, rx_hash_fields);
> }
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.h b/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.h
> index 5d5f64fab60f..8ac9d67a9603 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/rx_res.h
> @@ -48,9 +48,10 @@ int mlx5e_rx_res_rss_get_rxfh(struct mlx5e_rx_res *res, u32 rss_idx,
> int mlx5e_rx_res_rss_set_rxfh(struct mlx5e_rx_res *res, u32 rss_idx,
> const u32 *indir, const u8 *key, const u8 *hfunc);
>
> -u8 mlx5e_rx_res_rss_get_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt);
> +int mlx5e_rx_res_rss_get_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt,
> + u32 rss_idx);
> int mlx5e_rx_res_rss_set_hash_fields(struct mlx5e_rx_res *res, enum mlx5_traffic_types tt,
> - u8 rx_hash_fields);
> + u8 rx_hash_fields, u32 rss_idx);
> int mlx5e_rx_res_packet_merge_set_param(struct mlx5e_rx_res *res,
> struct mlx5e_packet_merge_param *pkt_merge_param);
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
> index aac32e505c14..50b8f3da4db1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_fs_ethtool.c
> @@ -902,8 +902,14 @@ static int mlx5e_set_rss_hash_opt(struct mlx5e_priv *priv,
> u8 rx_hash_field = 0;
> int err;
> int tt;
> + u32 flow_type = 0;
> + u32 rss_idx = 0;
>
> - tt = flow_type_to_traffic_type(nfc->flow_type);
> + if (nfc->flow_type & FLOW_RSS)
> + rss_idx = nfc->rss_context;
> +
> + flow_type = flow_type_mask(nfc->flow_type);
> + tt = flow_type_to_traffic_type(flow_type);
> if (tt < 0)
> return tt;
>
> @@ -911,10 +917,10 @@ static int mlx5e_set_rss_hash_opt(struct mlx5e_priv *priv,
> * on src IP, dest IP, TCP/UDP src port and TCP/UDP dest
> * port.
> */
> - if (nfc->flow_type != TCP_V4_FLOW &&
> - nfc->flow_type != TCP_V6_FLOW &&
> - nfc->flow_type != UDP_V4_FLOW &&
> - nfc->flow_type != UDP_V6_FLOW)
> + if (flow_type != TCP_V4_FLOW &&
> + flow_type != TCP_V6_FLOW &&
> + flow_type != UDP_V4_FLOW &&
> + flow_type != UDP_V6_FLOW)
> return -EOPNOTSUPP;
>
> if (nfc->data & ~(RXH_IP_SRC | RXH_IP_DST |
> @@ -931,7 +937,7 @@ static int mlx5e_set_rss_hash_opt(struct mlx5e_priv *priv,
> rx_hash_field |= MLX5_HASH_FIELD_SEL_L4_DPORT;
>
> mutex_lock(&priv->state_lock);
> - err = mlx5e_rx_res_rss_set_hash_fields(priv->rx_res, tt, rx_hash_field);
> + err = mlx5e_rx_res_rss_set_hash_fields(priv->rx_res, tt, rx_hash_field, rss_idx);
> mutex_unlock(&priv->state_lock);
>
> return err;
> @@ -940,14 +946,23 @@ static int mlx5e_set_rss_hash_opt(struct mlx5e_priv *priv,
> static int mlx5e_get_rss_hash_opt(struct mlx5e_priv *priv,
> struct ethtool_rxnfc *nfc)
> {
> - u32 hash_field = 0;
> + int hash_field = 0;
> int tt;
> + u32 flow_type = 0;
> + u32 rss_idx = 0;
Please maintain the reversed Christmas tree.
> +
> + if (nfc->flow_type & FLOW_RSS)
> + rss_idx = nfc->rss_context;
>
> - tt = flow_type_to_traffic_type(nfc->flow_type);
> + flow_type = flow_type_mask(nfc->flow_type);
> + tt = flow_type_to_traffic_type(flow_type);
> if (tt < 0)
> return tt;
>
> - hash_field = mlx5e_rx_res_rss_get_hash_fields(priv->rx_res, tt);
> + hash_field = mlx5e_rx_res_rss_get_hash_fields(priv->rx_res, tt, rss_idx);
> + if (hash_field < 0)
> + return hash_field;
> +
> nfc->data = 0;
>
> if (hash_field & MLX5_HASH_FIELD_SEL_SRC_IP)
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