netdev - Re: [PATCH net-next v2 11/11] bnxt: XDP multibuffer enablement

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Date:   Tue, 22 Mar 2022 11:04:09 -0700
From:   Michael Chan <michael.chan@...adcom.com>
To:     Andy Gospodarek <andrew.gospodarek@...adcom.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 11/11] bnxt: XDP multibuffer enablement

On Tue, Mar 22, 2022 at 3:26 AM Andy Gospodarek
<andrew.gospodarek@...adcom.com> wrote:
>
> On Mon, Mar 21, 2022 at 11:09:58PM -0700, Jakub Kicinski wrote:
> > On Sun, 20 Mar 2022 15:58:04 -0400 Michael Chan wrote:
> > > From: Andy Gospodarek <gospo@...adcom.com>
> > >
> > > Allow aggregation buffers to be in place in the receive path and
> > > allow XDP programs to be attached when using a larger than 4k MTU.
> > >
> > > Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
> > > Signed-off-by: Michael Chan <michael.chan@...adcom.com>
> > > ---
> > >  drivers/net/ethernet/broadcom/bnxt/bnxt.c     | 3 +--
> > >  drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 5 -----
> > >  2 files changed, 1 insertion(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > > index 84c89ee7dc2f..4f7213af1955 100644
> > > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > > @@ -1937,8 +1937,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
> > >             xdp_active = true;
> > >     }
> > >
> > > -   /* skip running XDP prog if there are aggregation bufs */
> > > -   if (!agg_bufs && xdp_active) {
> > > +   if (xdp_active) {
> > >             if (bnxt_rx_xdp(bp, rxr, cons, xdp, data, &len, event)) {
> > >                     rc = 1;
> > >                     goto next_rx;
> > > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
> > > index adbd92971209..3780b491a1d4 100644
> > > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
> > > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
> > > @@ -374,11 +374,6 @@ static int bnxt_xdp_set(struct bnxt *bp, struct bpf_prog *prog)
> > >     int tx_xdp = 0, rc, tc;
> > >     struct bpf_prog *old;
> > >
> > > -   if (prog && bp->dev->mtu > BNXT_MAX_PAGE_MODE_MTU) {
> >
> > This seems to be missing taking prog->aux->xdp_has_frags into account.
> >
>
> Thanks for the review!  I've sent Michael an updated patch and we should be
> able to get a v3 out this morning to cover this.
>

We'll send v3 when net-next opens up again in 2 weeks.

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