linux-kernel - Re: [PATCH net-next] net: broadcom: use ethtool string helpers

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Message-ID: <20241029173747.74596c8c@kernel.org>
Date: Tue, 29 Oct 2024 17:37:47 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Rosen Penev <rosenp@...il.com>
Cc: netdev@...r.kernel.org, Justin Chen <justin.chen@...adcom.com>, Florian
 Fainelli <florian.fainelli@...adcom.com>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Broadcom
 internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
 Rafał Miłecki <rafal@...ecki.pl>, Sudarsana Kalluru
 <skalluru@...vell.com>, Manish Chopra <manishc@...vell.com>, Doug Berger
 <opendmb@...il.com>, Jacob Keller <jacob.e.keller@...el.com>, Sabrina
 Dubroca <sd@...asysnail.net>, Uwe Kleine-König
 <u.kleine-koenig@...libre.com>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: broadcom: use ethtool string helpers

On Tue, 29 Oct 2024 16:43:15 -0700 Rosen Penev wrote:
> > > -             memcpy(buf, bnx2x_tests_str_arr + start,
> > > -                    ETH_GSTRING_LEN * BNX2X_NUM_TESTS(bp));
> > > +             for (i = start; i < BNX2X_NUM_TESTS(bp); i++)
> > > +                     ethtool_puts(&buf, bnx2x_tests_str_arr[i]);  
> >
> > I don't think this is equivalent.  
> What's wrong here?

We used to copy ETH_GSTRING_LEN * BNX2X_NUM_TESTS(bp)
but i will no only go from start to BNX2X_NUM_TESTS(bp)
IOW the copied length is ETH_GSTRING_LEN * (BNX2X_NUM_TESTS(bp) - start)
No?