Re: [PATCH net-next v5 5/7] bnxt_en: add support for header-data-split-thresh ethtool command

Andy Gospodarek
2024-11-14T22:54:57Z

On Wed, Nov 13, 2024 at 05:32:19PM +0000, Taehee Yoo wrote:
> The bnxt_en driver has configured the hds_threshold value automatically
> when TPA is enabled based on the rx-copybreak default value.
> Now the header-data-split-thresh ethtool command is added, so it adds an
> implementation of header-data-split-thresh option.
>
> Configuration of the header-data-split-thresh is allowed only when
> the header-data-split is enabled. The default value of
> header-data-split-thresh is 256, which is the default value of
> rx-copybreak, which used to be the hds_thresh value.
>
> # Example:
> # ethtool -G enp14s0f0np0 tcp-data-split on header-data-split-thresh 256
> # ethtool -g enp14s0f0np0
> Ring parameters for enp14s0f0np0:
> Pre-set maximums:
> ...
> Header data split thresh: 256
> Current hardware settings:
> ...
> TCP data split: on
> Header data split thresh: 256
>
> Tested-by: Stanislav Fomichev <sdf@fomichev.me>
> Signed-off-by: Taehee Yoo <ap420073@gmail.com>

Tested-by: Andy Gospodarek <gospo@broadcom.com>

> ---
>
> v5:
> - No changes.
>
> v4:
> - Reduce hole in struct bnxt.
> - Add ETHTOOL_RING_USE_HDS_THRS to indicate bnxt_en driver support
> header-data-split-thresh option.
> - Add Test tag from Stanislav.
>
> v3:
> - Drop validation logic tcp-data-split and tcp-data-split-thresh.
>
> v2:
> - Patch added.
>
> drivers/net/ethernet/broadcom/bnxt/bnxt.c | 3 ++-
> drivers/net/ethernet/broadcom/bnxt/bnxt.h | 2 ++
> drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 7 ++++++-
> 3 files changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> index 608bcca71676..27d6bac3a69a 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -4454,6 +4454,7 @@ void bnxt_set_tpa_flags(struct bnxt *bp)
> static void bnxt_init_ring_params(struct bnxt *bp)
> {
> bp->rx_copybreak = BNXT_DEFAULT_RX_COPYBREAK;
> + bp->hds_threshold = BNXT_DEFAULT_RX_COPYBREAK;
> }
>
> /* bp->rx_ring_size, bp->tx_ring_size, dev->mtu, BNXT_FLAG_{G|L}RO flags must
> @@ -6429,7 +6430,7 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, struct bnxt_vnic_info *vnic)
> VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV6);
> req->enables |=
> cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_HDS_THRESHOLD_VALID);
> - req->hds_threshold = cpu_to_le16(bp->rx_copybreak);
> + req->hds_threshold = cpu_to_le16(bp->hds_threshold);
> }
> req->vnic_id = cpu_to_le32(vnic->fw_vnic_id);
> return hwrm_req_send(bp, req);
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> index 3a7d2f3ebb2a..058db26fb255 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> @@ -2362,6 +2362,8 @@ struct bnxt {
> u8 q_ids[BNXT_MAX_QUEUE];
> u8 max_q;
> u8 num_tc;
> +#define BNXT_HDS_THRESHOLD_MAX 256
> + u16 hds_threshold;
>
> unsigned int current_interval;
> #define BNXT_TIMER_INTERVAL HZ
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> index b0054eef389b..a51a4cedecb9 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> @@ -833,6 +833,9 @@ static void bnxt_get_ringparam(struct net_device *dev,
> ering->rx_pending = bp->rx_ring_size;
> ering->rx_jumbo_pending = bp->rx_agg_ring_size;
> ering->tx_pending = bp->tx_ring_size;
> +
> + kernel_ering->hds_thresh = bp->hds_threshold;
> + kernel_ering->hds_thresh_max = BNXT_HDS_THRESHOLD_MAX;
> }
>
> static int bnxt_set_ringparam(struct net_device *dev,
> @@ -868,6 +871,7 @@ static int bnxt_set_ringparam(struct net_device *dev,
> else if (tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_UNKNOWN)
> bp->flags &= ~BNXT_FLAG_HDS;
>
> + bp->hds_threshold = (u16)kernel_ering->hds_thresh;
> bp->rx_ring_size = ering->rx_pending;
> bp->tx_ring_size = ering->tx_pending;
> bnxt_set_ring_params(bp);
> @@ -5363,7 +5367,8 @@ const struct ethtool_ops bnxt_ethtool_ops = {
> ETHTOOL_COALESCE_STATS_BLOCK_USECS |
> ETHTOOL_COALESCE_USE_ADAPTIVE_RX |
> ETHTOOL_COALESCE_USE_CQE,
> - .supported_ring_params = ETHTOOL_RING_USE_TCP_DATA_SPLIT,
> + .supported_ring_params = ETHTOOL_RING_USE_TCP_DATA_SPLIT |
> + ETHTOOL_RING_USE_HDS_THRS,
> .get_link_ksettings = bnxt_get_link_ksettings,
> .set_link_ksettings = bnxt_set_link_ksettings,
> .get_fec_stats = bnxt_get_fec_stats,
> --
> 2.34.1
>