From: Jakub Kicinski <kuba@kernel.org>
To: Shenwei Wang <shenwei.wang@nxp.com>
Cc: Wei Fang <wei.fang@nxp.com>, Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Clark Wang <xiaoning.wang@nxp.com>,
Stanislav Fomichev <sdf@fomichev.me>,
imx@lists.linux.dev, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-imx@nxp.com
Subject: Re: [PATCH v5 net-next 4/5] net: fec: add change_mtu to support dynamic buffer allocation
Date: Fri, 5 Sep 2025 18:56:06 -0700 [thread overview]
Message-ID: <20250905185606.42328008@kernel.org> (raw)
In-Reply-To: <20250904203502.403058-5-shenwei.wang@nxp.com>
On Thu, 4 Sep 2025 15:35:01 -0500 Shenwei Wang wrote:
> + if (fec_enet_alloc_buffers(ndev) < 0) {
> + fep->pagepool_order = old_order;
> + fep->rx_frame_size = old_size;
> + WRITE_ONCE(ndev->mtu, old_mtu);
> + fec_enet_alloc_buffers(ndev);
And how do you know that it will succeed now?
You can't leave the device in-operational due to reconfig request when
system is under memory pressure. You need to save the previous buffers
so that you can restore them without having to allocate.
> + ret = -ENOMEM;
> + }
next prev parent reply other threads:[~2025-09-06 1:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-04 20:34 [PATCH v5 net-next 0/5] net: fec: add the Jumbo frame support Shenwei Wang
2025-09-04 20:34 ` [PATCH v5 net-next 1/5] net: fec: use a member variable for maximum buffer size Shenwei Wang
2025-09-04 21:02 ` Frank Li
2025-09-06 1:49 ` Jakub Kicinski
2025-09-04 20:34 ` [PATCH v5 net-next 2/5] net: fec: add pagepool_order to support variable page size Shenwei Wang
2025-09-04 21:03 ` Frank Li
2025-09-06 1:52 ` Jakub Kicinski
2025-09-04 20:35 ` [PATCH v5 net-next 3/5] net: fec: add rx_frame_size to support configurable RX length Shenwei Wang
2025-09-04 21:13 ` Frank Li
2025-09-04 20:35 ` [PATCH v5 net-next 4/5] net: fec: add change_mtu to support dynamic buffer allocation Shenwei Wang
2025-09-04 21:37 ` Frank Li
2025-09-06 1:56 ` Jakub Kicinski [this message]
2025-09-04 20:35 ` [PATCH v5 net-next 5/5] net: fec: enable the Jumbo frame support for i.MX8QM Shenwei Wang
2025-09-04 21:40 ` Frank Li
2025-09-05 20:14 ` Shenwei Wang
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