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Message-ID: <PH7PR21MB31164D341A191550B4B20848CA9B9@PH7PR21MB3116.namprd21.prod.outlook.com> Date: Wed, 12 Apr 2023 14:36:50 +0000 From: Haiyang Zhang <haiyangz@...rosoft.com> To: Jacob Keller <jacob.e.keller@...el.com>, "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> CC: Dexuan Cui <decui@...rosoft.com>, KY Srinivasan <kys@...rosoft.com>, Paul Rosswurm <paulros@...rosoft.com>, "olaf@...fle.de" <olaf@...fle.de>, "vkuznets@...hat.com" <vkuznets@...hat.com>, "davem@...emloft.net" <davem@...emloft.net>, "wei.liu@...nel.org" <wei.liu@...nel.org>, "edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, "leon@...nel.org" <leon@...nel.org>, Long Li <longli@...rosoft.com>, "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>, "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>, "daniel@...earbox.net" <daniel@...earbox.net>, "john.fastabend@...il.com" <john.fastabend@...il.com>, "bpf@...r.kernel.org" <bpf@...r.kernel.org>, "ast@...nel.org" <ast@...nel.org>, Ajay Sharma <sharmaajay@...rosoft.com>, "hawk@...nel.org" <hawk@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: [PATCH V2,net-next, 3/3] net: mana: Add support for jumbo frame > -----Original Message----- > From: Jacob Keller <jacob.e.keller@...el.com> > Sent: Tuesday, April 11, 2023 7:13 PM > To: Haiyang Zhang <haiyangz@...rosoft.com>; linux-hyperv@...r.kernel.org; > netdev@...r.kernel.org > Cc: Dexuan Cui <decui@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>; > Paul Rosswurm <paulros@...rosoft.com>; olaf@...fle.de; > vkuznets@...hat.com; davem@...emloft.net; wei.liu@...nel.org; > edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com; > leon@...nel.org; Long Li <longli@...rosoft.com>; > ssengar@...ux.microsoft.com; linux-rdma@...r.kernel.org; > daniel@...earbox.net; john.fastabend@...il.com; bpf@...r.kernel.org; > ast@...nel.org; Ajay Sharma <sharmaajay@...rosoft.com>; > hawk@...nel.org; linux-kernel@...r.kernel.org > Subject: Re: [PATCH V2,net-next, 3/3] net: mana: Add support for jumbo > frame > > > > On 4/7/2023 1:59 PM, Haiyang Zhang wrote: > > During probe, get the hardware-allowed max MTU by querying the device > > configuration. Users can select MTU up to the device limit. > > When XDP is in use, limit MTU settings so the buffer size is within > > one page. > > Also, to prevent changing MTU fails, and leaves the NIC in a bad state, > > pre-allocate all buffers before starting the change. So in low memory > > condition, it will return error, without affecting the NIC. > > > > What happens if XDP gets enabled after MTU larger than PAGE_SIZE is set? > Will XDP fail to enable in that case? Yes, XDP program will fail to enable if MTU is too large. Thanks, - Haiyang
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