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Message-ID: <CAMArcTUC7eKaUfsEWQyR=aH_OMOcKxN9w2pHvui35AXP_5_GUA@mail.gmail.com>
Date: Thu, 12 Sep 2024 01:32:20 +0900
From: Taehee Yoo <ap420073@...il.com>
To: Brett Creeley <bcreeley@....com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
edumazet@...gle.com, corbet@....net, michael.chan@...adcom.com,
netdev@...r.kernel.org, linux-doc@...r.kernel.org, ecree.xilinx@...il.com,
przemyslaw.kitszel@...el.com, andrew@...n.ch, hkallweit1@...il.com,
kory.maincent@...tlin.com, ahmed.zaki@...el.com, paul.greenwalt@...el.com,
rrameshbabu@...dia.com, idosch@...dia.com, maxime.chevallier@...tlin.com,
danieller@...dia.com, aleksander.lobakin@...el.com
Subject: Re: [PATCH net-next v2 4/4] bnxt_en: add support for
tcp-data-split-thresh ethtool command
On Thu, Sep 12, 2024 at 12:52 AM Brett Creeley <bcreeley@....com> wrote:
Hi Brett,
Thank you so much for your review!
>
>
>
> On 9/11/2024 7:55 AM, Taehee Yoo wrote:
> > Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> >
> >
> > The bnxt_en driver has configured the hds_threshold value automatically
> > when TPA is enabled based on the rx-copybreak default value.
> > Now the tcp-data-split-thresh ethtool command is added, so it adds an
> > implementation of tcp-data-split-thresh option.
> >
> > Configuration of the tcp-data-split-thresh is allowed only when
> > the tcp-data-split is enabled. The default value of
> > tcp-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 tcp-data-split-thresh 256
> > # ethtool -g enp14s0f0np0
> > Ring parameters for enp14s0f0np0:
> > Pre-set maximums:
> > ...
> > Current hardware settings:
> > ...
> > TCP data split: on
> > TCP data split thresh: 256
> >
> > It enables tcp-data-split and sets tcp-data-split-thresh value to 256.
> >
> > # ethtool -G enp14s0f0np0 tcp-data-split off
> > # ethtool -g enp14s0f0np0
> > Ring parameters for enp14s0f0np0:
> > Pre-set maximums:
> > ...
> > Current hardware settings:
> > ...
> > TCP data split: off
> > TCP data split thresh: n/a
> >
> > Signed-off-by: Taehee Yoo <ap420073@...il.com>
> > ---
> >
> > 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 | 9 +++++++++
> > 3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > index f046478dfd2a..872b15842b11 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > @@ -4455,6 +4455,7 @@ static void bnxt_init_ring_params(struct bnxt *bp)
> > {
> > bp->rx_copybreak = BNXT_DEFAULT_RX_COPYBREAK;
> > bp->flags |= BNXT_FLAG_HDS;
> > + 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 35601c71dfe9..48f390519c35 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
> > @@ -2311,6 +2311,8 @@ struct bnxt {
> > int rx_agg_nr_pages;
> > int rx_nr_rings;
> > int rsscos_nr_ctxs;
> > +#define BNXT_HDS_THRESHOLD_MAX 256
> > + u16 hds_threshold;
> >
> > u32 tx_ring_size;
> > u32 tx_ring_mask;
> > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > index ab64d7f94796..5b1f3047bf84 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> > @@ -839,6 +839,8 @@ static void bnxt_get_ringparam(struct net_device *dev,
> > else
> > kernel_ering->tcp_data_split = ETHTOOL_TCP_DATA_SPLIT_DISABLED;
> >
> > + kernel_ering->tcp_data_split_thresh = bp->hds_threshold;
> > +
> > ering->tx_max_pending = BNXT_MAX_TX_DESC_CNT;
> >
> > ering->rx_pending = bp->rx_ring_size;
> > @@ -864,6 +866,12 @@ static int bnxt_set_ringparam(struct net_device *dev,
> > return -EINVAL;
> > }
> >
> > + if (kernel_ering->tcp_data_split_thresh > BNXT_HDS_THRESHOLD_MAX) {
> > + NL_SET_ERR_MSG_MOD(extack,
> > + "tcp-data-split-thresh size too big");
>
> Should you print the BNXT_HDS_THRESHOLD_MAX value here so the user knows
> the max size?
Okay, I will print BNXT_HDS_THRESHOLD_MAX value with extack message.
>
> Actually, does it make more sense for ethtool get_ringparam to query the
> max threshold size from the driver and reject this in the core so all
> drivers don't have to have this same kind of check?
Ah, I didn't consider this.
You mean that like ETHTOOL_A_RINGS_RX_MAX, right?
So, we can check precise information in userspace without error.
We can check tcp-data-split-threshold-max information like below.
ethtool -g enp13s0f0np0
Ring parameters for enp13s0f0np0:
Pre-set maximums:
RX: 2047
RX Mini: n/a
RX Jumbo: 8191
TX: 2047
TX push buff len: n/a
TCP data split thresh: 256 <-- here
Current hardware settings:
RX: 511
RX Mini: n/a
RX Jumbo: 2044
TX: 511
RX Buf Len: n/a
CQE Size: n/a
TX Push: off
RX Push: off
TX push buff len: n/a
TCP data split: on
TCP data split thresh: 0
I agree with this suggestion.
So, I will try to add ETHTOOL_A_RINGS_TCP_DATA_SPLIT_THRESH_MAX
option in the ethtool core unless there is no objection.
>
> Thanks,
>
> Brett
>
> > + return -EINVAL;
> > + }
> > +
> > if (netif_running(dev))
> > bnxt_close_nic(bp, false, false);
> >
> > @@ -871,6 +879,7 @@ static int bnxt_set_ringparam(struct net_device *dev,
> > case ETHTOOL_TCP_DATA_SPLIT_UNKNOWN:
> > case ETHTOOL_TCP_DATA_SPLIT_ENABLED:
> > bp->flags |= BNXT_FLAG_HDS;
> > + bp->hds_threshold = (u16)kernel_ering->tcp_data_split_thresh;
> > break;
> > case ETHTOOL_TCP_DATA_SPLIT_DISABLED:
> > bp->flags &= ~BNXT_FLAG_HDS;
> > --
> > 2.34.1
> >
> >
Thanks a lot!
Taehee Yoo
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