From: Sagi Grimberg <sagi@grimberg.me>
To: zhenwei pi <pizhenwei@bytedance.com>,
kbusch@kernel.org, hch@lst.de, axboe@fb.com
Cc: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] nvme-rdma: handle nvme completion data length
Date: Fri, 23 Oct 2020 11:01:40 -0700 [thread overview]
Message-ID: <d23e33e7-d545-2ad0-d163-5182dd5430b1@grimberg.me> (raw)
In-Reply-To: <20201023065910.1358586-1-pizhenwei@bytedance.com>
> diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
> index 9e378d0a0c01..2ecadd309f4a 100644
> --- a/drivers/nvme/host/rdma.c
> +++ b/drivers/nvme/host/rdma.c
> @@ -1767,6 +1767,21 @@ static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
> return;
> }
>
> + /* received data length checking */
> + if (unlikely(wc->byte_len < len)) {
> + /* zero bytes message could be ignored */
> + if (!wc->byte_len) {
> + nvme_rdma_post_recv(queue, qe);
> + return;
> + }
Nothing in the spec defines zero-length messages, hence we cannot
support something that is not standard. If your array needs this,
please submit a TPAR to the NVMe TWG.
WARNING: multiple messages have this Message-ID (diff)
From: Sagi Grimberg <sagi@grimberg.me>
To: zhenwei pi <pizhenwei@bytedance.com>,
kbusch@kernel.org, hch@lst.de, axboe@fb.com
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org
Subject: Re: [PATCH v2] nvme-rdma: handle nvme completion data length
Date: Fri, 23 Oct 2020 11:01:40 -0700 [thread overview]
Message-ID: <d23e33e7-d545-2ad0-d163-5182dd5430b1@grimberg.me> (raw)
In-Reply-To: <20201023065910.1358586-1-pizhenwei@bytedance.com>
> diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
> index 9e378d0a0c01..2ecadd309f4a 100644
> --- a/drivers/nvme/host/rdma.c
> +++ b/drivers/nvme/host/rdma.c
> @@ -1767,6 +1767,21 @@ static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
> return;
> }
>
> + /* received data length checking */
> + if (unlikely(wc->byte_len < len)) {
> + /* zero bytes message could be ignored */
> + if (!wc->byte_len) {
> + nvme_rdma_post_recv(queue, qe);
> + return;
> + }
Nothing in the spec defines zero-length messages, hence we cannot
support something that is not standard. If your array needs this,
please submit a TPAR to the NVMe TWG.
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Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme
next prev parent reply other threads:[~2020-10-23 18:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-23 6:59 [PATCH v2] nvme-rdma: handle nvme completion data length zhenwei pi
2020-10-23 6:59 ` zhenwei pi
2020-10-23 8:45 ` Chao Leng
2020-10-23 8:45 ` Chao Leng
2020-10-23 18:01 ` Sagi Grimberg [this message]
2020-10-23 18:01 ` Sagi Grimberg
2020-10-24 7:36 ` Christoph Hellwig
2020-10-24 7:36 ` Christoph Hellwig
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