From: Jason Wang <jasowang@redhat.com>
To: Xuan Zhuo <xuanzhuo@linux.alibaba.com>, netdev@vger.kernel.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Björn Töpel" <bjorn.topel@intel.com>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Jonathan Lemon" <jonathan.lemon@gmail.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"John Fastabend" <john.fastabend@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"KP Singh" <kpsingh@kernel.org>,
virtualization@lists.linux-foundation.org, bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next v2 1/3] net: add priv_flags for allow tx skb without linear
Date: Wed, 20 Jan 2021 11:01:24 +0800 [thread overview]
Message-ID: <13d2ceda-16d1-488c-d131-55cca813b224@redhat.com> (raw)
In-Reply-To: <30ae1c94b5c26919bd90bb251761c526edfbaf56.1611048724.git.xuanzhuo@linux.alibaba.com>
On 2021/1/19 下午5:45, Xuan Zhuo wrote:
> In some cases, we hope to construct skb directly based on the existing
> memory without copying data. In this case, the page will be placed
> directly in the skb, and the linear space of skb is empty. But
> unfortunately, many the network card does not support this operation.
> For example Mellanox Technologies MT27710 Family [ConnectX-4 Lx] will
> get the following error message:
>
> mlx5_core 0000:3b:00.1 eth1: Error cqe on cqn 0x817, ci 0x8, qn 0x1dbb, opcode 0xd, syndrome 0x1, vendor syndrome 0x68
> 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000030: 00 00 00 00 60 10 68 01 0a 00 1d bb 00 0f 9f d2
> WQE DUMP: WQ size 1024 WQ cur size 0, WQE index 0xf, len: 64
> 00000000: 00 00 0f 0a 00 1d bb 03 00 00 00 08 00 00 00 00
> 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000020: 00 00 00 2b 00 08 00 00 00 00 00 05 9e e3 08 00
> 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> mlx5_core 0000:3b:00.1 eth1: ERR CQE on SQ: 0x1dbb
>
> So a priv_flag is added here to indicate whether the network card
> supports this feature.
I don't see Mellanox engineers are copied. I wonder if we need their
confirmation on whether it's a bug or hardware limitation.
Thanks
next prev parent reply other threads:[~2021-01-20 3:04 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-19 9:45 [PATCH bpf-next v2 0/3] xsk: build skb by page Xuan Zhuo
2021-01-19 9:45 ` [PATCH bpf-next v2 1/3] net: add priv_flags for allow tx skb without linear Xuan Zhuo
2021-01-20 3:01 ` Jason Wang [this message]
2021-01-19 9:45 ` [PATCH bpf-next v2 2/3] virtio-net: support IFF_TX_SKB_NO_LINEAR Xuan Zhuo
2021-01-19 14:28 ` Alexander Lobakin
[not found] ` <cover.1611128806.git.xuanzhuo@linux.alibaba.com>
2021-01-20 7:49 ` [PATCH net-next " Xuan Zhuo
2021-01-20 7:57 ` Michael S. Tsirkin
2021-01-20 7:50 ` [PATCH net-next v2 3/3] xsk: build skb by page Xuan Zhuo
2021-01-20 8:10 ` Michael S. Tsirkin
2021-01-20 8:11 ` Michael S. Tsirkin
[not found] ` <cover.1611131344.git.xuanzhuo@linux.alibaba.com>
2021-01-20 8:30 ` Xuan Zhuo
2021-01-20 13:56 ` Alexander Lobakin
2021-01-21 7:41 ` Magnus Karlsson
2021-01-21 10:54 ` Yunsheng Lin
2021-01-19 9:45 ` [PATCH bpf-next " Xuan Zhuo
2021-01-19 14:43 ` Alexander Lobakin
2021-01-19 9:50 ` [PATCH bpf-next v2 0/3] " Michael S. Tsirkin
[not found] ` <1611053609.502882-1-xuanzhuo@linux.alibaba.com>
2021-01-19 11:02 ` Michael S. Tsirkin
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