linux-kernel - Re: [PATCH net-next] bnxt: Don't print message, if DAC isn't connected on both ends

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Date:   Thu, 7 Dec 2017 10:14:42 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] bnxt: Don't print message, if DAC isn't
 connected on both ends

On Wed, 6 Dec 2017 11:27:31 -0800
Michael Chan <michael.chan@...adcom.com> wrote:

> On Tue, Dec 5, 2017 at 4:33 AM, Thomas Bogendoerfer
> <tbogendoerfer@...e.de> wrote:
> > bnxt driver spams logfiles with
> >
> > [  541.003065] bnxt_en 0000:5d:00.1 eth5: Link speed -1 no longer supported
> >
> > if a direct attached cable (DAC) is plugged into the bnxt card and is
> > unplugged on the other side. This patch removes the code printing this
> > message, since it doesn't provide any useful information.
> >
> > Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
> > ---
> >  drivers/net/ethernet/broadcom/bnxt/bnxt.c | 9 ---------
> >  1 file changed, 9 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > index 8c1dd60eab6f..8a2319ed79dc 100644
> > --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> > @@ -1701,18 +1701,9 @@ static int bnxt_async_event_process(struct bnxt *bp,
> >         /* TODO CHIMP_FW: Define event id's for link change, error etc */
> >         switch (event_id) {
> >         case ASYNC_EVENT_CMPL_EVENT_ID_LINK_SPEED_CFG_CHANGE: {
> > -               u32 data1 = le32_to_cpu(cmpl->event_data1);
> > -               struct bnxt_link_info *link_info = &bp->link_info;
> > -
> >                 if (BNXT_VF(bp))
> >                         goto async_event_process_exit;
> > -               if (data1 & 0x20000) {
> > -                       u16 fw_speed = link_info->force_link_speed;
> > -                       u32 speed = bnxt_fw_to_ethtool_speed(fw_speed);
> >
> > -                       netdev_warn(bp->dev, "Link speed %d no longer supported\n",
> > -                                   speed);
> > -               }
> 
> This is supposed to provide useful information to the user under some
> conditions. 

well, it will print the forced rate, if there is one configured and -1 otherwise,
if the link is lost or will not come up because of a cable problem. I don't see much
value in that...

Thomas.

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