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Message-ID: <CACKFLinbsMQE1jb0G-7iMKAo4ZMKp42xiSCZ0XznBV9pDAs3-g@mail.gmail.com>
Date: Fri, 25 Oct 2024 15:00:11 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc: Taehee Yoo <ap420073@...il.com>, davem@...emloft.net, kuba@...nel.org,
pabeni@...hat.com, edumazet@...gle.com, almasrymina@...gle.com,
donald.hunter@...il.com, corbet@....net, andrew+netdev@...n.ch,
hawk@...nel.org, ilias.apalodimas@...aro.org, ast@...nel.org,
daniel@...earbox.net, john.fastabend@...il.com, dw@...idwei.uk,
sdf@...ichev.me, asml.silence@...il.com, brett.creeley@....com,
linux-doc@...r.kernel.org, netdev@...r.kernel.org, kory.maincent@...tlin.com,
maxime.chevallier@...tlin.com, danieller@...dia.com, hengqi@...ux.alibaba.com,
ecree.xilinx@...il.com, przemyslaw.kitszel@...el.com, hkallweit1@...il.com,
ahmed.zaki@...el.com, rrameshbabu@...dia.com, idosch@...dia.com,
jiri@...nulli.us, bigeasy@...utronix.de, lorenzo@...nel.org,
jdamato@...tly.com, aleksander.lobakin@...el.com, kaiyuanz@...gle.com,
willemb@...gle.com, daniel.zahka@...il.com
Subject: Re: [PATCH net-next v4 2/8] bnxt_en: add support for tcp-data-split
ethtool command
On Fri, Oct 25, 2024 at 12:24 PM Andy Gospodarek
<andrew.gospodarek@...adcom.com> wrote:
>
> On Thu, Oct 24, 2024 at 10:02:30PM -0700, Michael Chan wrote:
> > On Tue, Oct 22, 2024 at 9:24 AM Taehee Yoo <ap420073@...il.com> wrote:
> > >
> > > NICs that uses bnxt_en driver supports tcp-data-split feature by the
> > > name of HDS(header-data-split).
> > > But there is no implementation for the HDS to enable or disable by
> > > ethtool.
> > > Only getting the current HDS status is implemented and The HDS is just
> > > automatically enabled only when either LRO, HW-GRO, or JUMBO is enabled.
> > > The hds_threshold follows rx-copybreak value. and it was unchangeable.
> > >
> > > This implements `ethtool -G <interface name> tcp-data-split <value>`
> > > command option.
> > > The value can be <on>, <off>, and <auto> but the <auto> will be
> > > automatically changed to <on>.
> > >
> > > HDS feature relies on the aggregation ring.
> > > So, if HDS is enabled, the bnxt_en driver initializes the aggregation
> > > ring.
> > > This is the reason why BNXT_FLAG_AGG_RINGS contains HDS condition.
> > >
> > > Tested-by: Stanislav Fomichev <sdf@...ichev.me>
> > > Signed-off-by: Taehee Yoo <ap420073@...il.com>
> > > ---
> > >
> > > v4:
> > > - Do not support disable tcp-data-split.
> > > - Add Test tag from Stanislav.
> > >
> > > v3:
> > > - No changes.
> > >
> > > v2:
> > > - Do not set hds_threshold to 0.
> > >
> > > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 8 +++-----
> > > drivers/net/ethernet/broadcom/bnxt/bnxt.h | 5 +++--
> > > drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 13 +++++++++++++
> > > 3 files changed, 19 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > > index 0f5fe9ba691d..91ea42ff9b17 100644
> > > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> >
> > > @@ -6420,15 +6420,13 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, struct bnxt_vnic_info *vnic)
> > >
> > > req->flags = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_JUMBO_PLACEMENT);
> > > req->enables = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_JUMBO_THRESH_VALID);
> > > + req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
> > >
> > > - if (BNXT_RX_PAGE_MODE(bp)) {
> > > - req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
> >
> > Please explain why this "if" condition is removed.
> > BNXT_RX_PAGE_MODE() means that we are in XDP mode and we currently
> > don't support HDS in XDP mode. Added Andy Gospo to CC so he can also
> > comment.
> >
>
> In bnxt_set_rx_skb_mode we set BNXT_FLAG_RX_PAGE_MODE and clear
> BNXT_FLAG_AGG_RINGS
The BNXT_FLAG_AGG_RINGS flag is true if the JUMBO, GRO, or LRO flag is
set. So even though it is initially cleared in
bnxt_set_rx_skb_mode(), we'll set the JUMBO flag if we are in
multi-buffer XDP mode. Again, we don't enable HDS in any XDP mode so
I think we need to keep the original logic here to skip setting the
HDS threshold if BNXT_FLAG_RX_PAGE_MODE is set.
> , so this should work. The only issue is that we
> have spots in the driver where we check BNXT_RX_PAGE_MODE(bp) to
> indicate that XDP single-buffer mode is enabled on the device.
>
> If you need to respin this series I would prefer that the change is like
> below to key off the page mode being disabled and BNXT_FLAG_AGG_RINGS
> being enabled to setup HDS. This will serve as a reminder that this is
> for XDP.
>
> @@ -6418,15 +6418,13 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, struct bnxt_vnic_info *vnic)
>
> req->flags = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_JUMBO_PLACEMENT);
> req->enables = cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_JUMBO_THRESH_VALID);
> + req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
>
> - if (BNXT_RX_PAGE_MODE(bp)) {
> - req->jumbo_thresh = cpu_to_le16(bp->rx_buf_use_size);
> - } else {
> + if (!BNXT_RX_PAGE_MODE(bp) && (bp->flags & BNXT_FLAG_AGG_RINGS)) {
> req->flags |= cpu_to_le32(VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV4 |
> VNIC_PLCMODES_CFG_REQ_FLAGS_HDS_IPV6);
> req->enables |=
> cpu_to_le32(VNIC_PLCMODES_CFG_REQ_ENABLES_HDS_THRESHOLD_VALID);
> - req->jumbo_thresh = cpu_to_le16(bp->rx_copy_thresh);
> req->hds_threshold = cpu_to_le16(bp->rx_copy_thresh);
> }
> req->vnic_id = cpu_to_le32(vnic->fw_vnic_id);
>
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