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Message-ID: <20240805034819.GA13225@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Sun, 4 Aug 2024 20:48:19 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: Zhu Yanjun <yanjun.zhu@...ux.dev>, linux-hyperv@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rdma@...r.kernel.org, "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Long Li <longli@...rosoft.com>,
Ajay Sharma <sharmaajay@...rosoft.com>,
Simon Horman <horms@...nel.org>,
Konstantin Taranov <kotaranov@...rosoft.com>,
Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>,
Erick Archer <erick.archer@...look.com>,
Pavan Chebbi <pavan.chebbi@...adcom.com>,
Ahmed Zaki <ahmed.zaki@...el.com>,
Colin Ian King <colin.i.king@...il.com>
Subject: Re: [PATCH net-next v2] net: mana: Implement
get_ringparam/set_ringparam for mana
On Sat, Aug 03, 2024 at 11:31:54AM -0700, Stephen Hemminger wrote:
> On Sun, 4 Aug 2024 02:09:21 +0800
> Zhu Yanjun <yanjun.zhu@...ux.dev> wrote:
>
> > >
> > > /* The minimum size of the WQE is 32 bytes, hence
> > > - * MAX_SEND_BUFFERS_PER_QUEUE represents the maximum number of WQEs
> > > + * apc->tx_queue_size represents the maximum number of WQEs
> > > * the SQ can store. This value is then used to size other queues
> > > * to prevent overflow.
> > > + * Also note that the txq_size is always going to be MANA_PAGE_ALIGNED,
> > > + * as tx_queue_size is always a power of 2.
> > > */
> > > - txq_size = MAX_SEND_BUFFERS_PER_QUEUE * 32;
> > > - BUILD_BUG_ON(!MANA_PAGE_ALIGNED(txq_size));
> > > + txq_size = apc->tx_queue_size * 32;
> >
> > Not sure if the following is needed or not.
> > "
> > WARN_ON(!MANA_PAGE_ALIGNED(txq_size));
> > "
> >
> > Zhu Yanjun
>
> On many systems warn is set to panic the system.
> Any constraint like this should be enforced where user input
> is managed. In this patch, that would be earlier in mana_set_ringparam().
> Looking there, the only requirement is that txq_size is between
> the min/max buffers per queue and a power of 2.
Thanks Stephen, that's right.
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