From: Honggang LI <honggangli@163.com>
To: linux-rdma@vger.kernel.org
Subject: Re: Question about extra 40 bytes needed for UD receive buffer
Date: Mon, 15 Apr 2024 18:10:26 +0800 [thread overview]
Message-ID: <Zhz9EkBFTZjzp4Wg@fc39> (raw)
In-Reply-To: <ZhyXEOC9SMIxjXP1@fc39>
On Mon, Apr 15, 2024 at 10:55:12AM +0800, Honggang LI wrote:
> Subject: Question about extra 40 bytes needed for UD receive buffer
> From: Honggang LI <honggangli@163.com>
> Date: Mon, 15 Apr 2024 10:55:12 +0800
>
> However, I'm confused by the dump of `mckey` receive buffer. The flag
> `IBV_WC_GRH` is set in `ibv_wc.wc_flags`, but there is no GRH in
> the receive buffer. Received data starts from the *first* byte of
> receive buffer. As multicast over UD QP only, can someone please explian
> why there is no GRH in receive buffer and the data starts from the first
> bytes of receive buffer with `IBV_WC_GRH` was set?
Please ignore this. I made a mistake with the offset of the grh.
There is a valid IP header in the receive buffer of 'mckey'.
prev parent reply other threads:[~2024-04-15 10:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-15 2:55 Question about extra 40 bytes needed for UD receive buffer Honggang LI
2024-04-15 10:10 ` Honggang LI [this message]
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