From: Haiyang Zhang <haiyangz@microsoft.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
Dexuan Cui <decui@microsoft.com>,
KY Srinivasan <kys@microsoft.com>,
Paul Rosswurm <paulros@microsoft.com>,
"olaf@aepfle.de" <olaf@aepfle.de>,
"vkuznets@redhat.com" <vkuznets@redhat.com>,
"davem@davemloft.net" <davem@davemloft.net>,
"wei.liu@kernel.org" <wei.liu@kernel.org>,
"edumazet@google.com" <edumazet@google.com>,
"pabeni@redhat.com" <pabeni@redhat.com>,
"leon@kernel.org" <leon@kernel.org>,
Long Li <longli@microsoft.com>,
"ssengar@linux.microsoft.com" <ssengar@linux.microsoft.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"ast@kernel.org" <ast@kernel.org>,
Ajay Sharma <sharmaajay@microsoft.com>,
"hawk@kernel.org" <hawk@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH V3,net-next, 3/4] net: mana: Enable RX path to handle various MTU sizes
Date: Sat, 15 Apr 2023 14:25:29 +0000 [thread overview]
Message-ID: <PH7PR21MB3116023068CFA8D600FA5B18CA9E9@PH7PR21MB3116.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20230414190608.3c21f44f@kernel.org>
> -----Original Message-----
> From: Jakub Kicinski <kuba@kernel.org>
> Sent: Friday, April 14, 2023 10:06 PM
> To: Haiyang Zhang <haiyangz@microsoft.com>
> Cc: linux-hyperv@vger.kernel.org; netdev@vger.kernel.org; Dexuan Cui
> <decui@microsoft.com>; KY Srinivasan <kys@microsoft.com>; Paul Rosswurm
> <paulros@microsoft.com>; olaf@aepfle.de; vkuznets@redhat.com;
> davem@davemloft.net; wei.liu@kernel.org; edumazet@google.com;
> pabeni@redhat.com; leon@kernel.org; Long Li <longli@microsoft.com>;
> ssengar@linux.microsoft.com; linux-rdma@vger.kernel.org;
> daniel@iogearbox.net; john.fastabend@gmail.com; bpf@vger.kernel.org;
> ast@kernel.org; Ajay Sharma <sharmaajay@microsoft.com>;
> hawk@kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH V3,net-next, 3/4] net: mana: Enable RX path to handle
> various MTU sizes
>
> On Wed, 12 Apr 2023 14:16:02 -0700 Haiyang Zhang wrote:
> > + } else if (rxq->alloc_size > PAGE_SIZE) {
> > + if (is_napi)
> > + va = napi_alloc_frag(rxq->alloc_size);
>
> Allocating frag larger than a page is not safe.
I saw other drivers doing this - use napi_alloc_frag for size bigger than a page.
And it returns compound page. Why it's not safe? Should we use other allocator
when need compound pages?
> Frag allocator falls back to allocating single pages, doesn't it?
Actually I checked it. Compound page is still returned for size smaller than PAGE_SIZE,
so I used single page allocation for that.
Thanks,
- Haiyang
next prev parent reply other threads:[~2023-04-15 14:25 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-12 21:15 [PATCH V3,net-next, 0/4] net: mana: Add support for jumbo frame Haiyang Zhang
2023-04-12 21:16 ` [PATCH V3,net-next, 1/4] net: mana: Use napi_build_skb in RX path Haiyang Zhang
2023-04-12 21:16 ` [PATCH V3,net-next, 2/4] net: mana: Refactor RX buffer allocation code to prepare for various MTU Haiyang Zhang
2023-04-13 13:04 ` Leon Romanovsky
2023-04-13 14:03 ` Haiyang Zhang
2023-04-13 16:30 ` Leon Romanovsky
2023-04-13 16:40 ` Jakub Kicinski
2023-04-13 16:59 ` Leon Romanovsky
2023-04-13 17:01 ` Jakub Kicinski
2023-04-15 2:04 ` Jakub Kicinski
2023-04-15 14:09 ` Haiyang Zhang
2023-04-12 21:16 ` [PATCH V3,net-next, 3/4] net: mana: Enable RX path to handle various MTU sizes Haiyang Zhang
2023-04-15 2:06 ` Jakub Kicinski
2023-04-15 14:25 ` Haiyang Zhang [this message]
2023-04-17 17:52 ` Jakub Kicinski
2023-04-17 19:52 ` Haiyang Zhang
2023-04-12 21:16 ` [PATCH V3,net-next, 4/4] net: mana: Add support for jumbo frame Haiyang Zhang
2023-04-15 2:08 ` [PATCH V3,net-next, 0/4] " Jakub Kicinski
2023-04-15 14:11 ` Haiyang Zhang
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