linux-kernel - RE: [EXTERNAL] Re: [PATCH RFC 1/2] net: mana: Add support for coalesced RX packets on CQE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID:
 <SA3PR21MB386756824E5257A24338D2BFCA86A@SA3PR21MB3867.namprd21.prod.outlook.com>
Date: Mon, 5 Jan 2026 17:02:43 +0000
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: Simon Horman <horms@...nel.org>, Haiyang Zhang
	<haiyangz@...ux.microsoft.com>
CC: "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, KY Srinivasan
	<kys@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui
	<DECUI@...rosoft.com>, Andrew Lunn <andrew+netdev@...n.ch>, "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>, Konstantin Taranov <kotaranov@...rosoft.com>, Erni
 Sri Satya Vennela <ernis@...ux.microsoft.com>, Shradha Gupta
	<shradhagupta@...ux.microsoft.com>, Saurabh Sengar
	<ssengar@...ux.microsoft.com>, Aditya Garg <gargaditya@...ux.microsoft.com>,
	Dipayaan Roy <dipayanroy@...ux.microsoft.com>, Shiraz Saleem
	<shirazsaleem@...rosoft.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>, Paul Rosswurm <paulros@...rosoft.com>
Subject: RE: [EXTERNAL] Re: [PATCH RFC 1/2] net: mana: Add support for
 coalesced RX packets on CQE



> -----Original Message-----
> From: Simon Horman <horms@...nel.org>
> Sent: Monday, January 5, 2026 6:49 AM
> To: Haiyang Zhang <haiyangz@...ux.microsoft.com>
> Cc: linux-hyperv@...r.kernel.org; netdev@...r.kernel.org; KY Srinivasan
> <kys@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>; Wei Liu
> <wei.liu@...nel.org>; Dexuan Cui <DECUI@...rosoft.com>; Andrew Lunn
> <andrew+netdev@...n.ch>; 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>; Konstantin
> Taranov <kotaranov@...rosoft.com>; Erni Sri Satya Vennela
> <ernis@...ux.microsoft.com>; Shradha Gupta
> <shradhagupta@...ux.microsoft.com>; Saurabh Sengar
> <ssengar@...ux.microsoft.com>; Aditya Garg
> <gargaditya@...ux.microsoft.com>; Dipayaan Roy
> <dipayanroy@...ux.microsoft.com>; Shiraz Saleem
> <shirazsaleem@...rosoft.com>; linux-kernel@...r.kernel.org; linux-
> rdma@...r.kernel.org; Paul Rosswurm <paulros@...rosoft.com>
> Subject: [EXTERNAL] Re: [PATCH RFC 1/2] net: mana: Add support for
> coalesced RX packets on CQE
> 
> On Tue, Dec 16, 2025 at 07:57:54AM -0800, Haiyang Zhang wrote:
> > From: Haiyang Zhang <haiyangz@...rosoft.com>
> >
> > Our NIC can have up to 4 RX packets on 1 CQE. To support this feature,
> > check and process the type CQE_RX_COALESCED_4. The default setting is
> > disabled, to avoid possible regression on latency.
> >
> > And add ethtool handler to switch this feature. To turn it on, run:
> >   ethtool -C <nic> rx-frames 4
> > To turn it off:
> >   ethtool -C <nic> rx-frames 1
> >
> > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> 
> ...
> 
> > diff --git a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> > index 0e2f4343ac67..1b9ed5c9bbff 100644
> > --- a/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> > +++ b/drivers/net/ethernet/microsoft/mana/mana_ethtool.c
> > @@ -397,6 +397,58 @@ static void mana_get_channels(struct net_device
> *ndev,
> >  	channel->combined_count = apc->num_queues;
> >  }
> >
> > +static int mana_get_coalesce(struct net_device *ndev,
> > +			     struct ethtool_coalesce *ec,
> > +			     struct kernel_ethtool_coalesce *kernel_coal,
> > +			     struct netlink_ext_ack *extack)
> 
> ...
> 
> > +	if (err) {
> > +		netdev_err(ndev, "Set rx-frames to %u failed:%d\n",
> > +			   ec->rx_max_coalesced_frames, err);
> > +		NL_SET_ERR_MSG_FMT(extack, "Set rx-frames to %u failed:%d\n",
> > +				   ec->rx_max_coalesced_frames, err);
> 
> nit: I don't think the trailing '\n' is necessary here.
> 
Will update it.

Thanks,
- Haiyang