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-<table class="head">
- <tr>
- <td class="head-ltitle">NVMF_CHE(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">NVMF_CHE(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">nvmf_che</code> &#x2014; <span class="Nd">TCP
- transport for NVM Express over Fabrics on Chelsio NICs</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">In <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>nvmf_che_load=&quot;YES&quot;</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">nvmf_che</code> module implements the a
- TCP/IP transport for NVM Express over Fabrics using PDU offload on Chelsio
- T7 adapters. It can be used by either the in-kernel NVMeoF host driver or
- controller. In order to use PDU offload, the initial socket connection must
- be using the TCP offload engine (TOE) on a supported network interface. In
- addition, controller connections must negotiate a suitable
- <code class="Dv">MAXH2CDATA</code> limit to ensure that received PDUs do not
- exceeed the maximum size supported by the adapter.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
- VARIABLES</a></h1>
-<p class="Pp">The following variables are available as both
- <a class="Xr">sysctl(8)</a> variables and <a class="Xr">loader(8)</a>
- tunables:</p>
-<dl class="Bl-tag">
- <dt id="kern.nvmf.che.max_transmit_pdu"><var class="Va">kern.nvmf.che.max_transmit_pdu</var></dt>
- <dd>The maximum size of a transmitted PDU including all headers, payload, and
- checksums. This is an upper limit enforced when queues are created.
- Individual adapters may empose a smaller limit. The default size is 32
- kilobytes.</dd>
- <dt id="kern.nvmf.che.max_receive_pdu"><var class="Va">kern.nvmf.che.max_receive_pdu</var></dt>
- <dd>As above, but for received PDUs.</dd>
- <dt id="kern.nvmf.che.use_dsgl"><var class="Va">kern.nvmf.che.use_dsgl</var></dt>
- <dd>Enable the use of a S/G list for large writes into adapter memory when
- writing control structures for DDP (not used for PDU payload data). S/G
- lists are enabled by default.</dd>
- <dt id="kern.nvmf.che.inline_threshold"><var class="Va">kern.nvmf.che.inline_threshold</var></dt>
- <dd>Writes of control structures into adapter memory use a S/G list instead of
- immediate data placed in work requests. The default threshold is 256
- bytes.</dd>
- <dt id="kern.nvmf.che.ddp_tags_per_qp"><var class="Va">kern.nvmf.che.ddp_tags_per_qp</var></dt>
- <dd>The number of STAGs reserved for use by DDP buffers for each queue pair.
- Each command sent on a queue that requests data from the remote peer can
- use DDP to place received data directly into the associated data buffer.
- Each buffer requires a STAG to enable DDP. If an STAG is not available
- when command requesting remote data is sent, the data will be received in
- free list buffers and copied into the data buffer by the driver instead.
- The default size is 256 kilobytes.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">cxgbe(4)</a>, <a class="Xr">nvmf(4)</a>,
- <a class="Xr">nvmf_tcp(4)</a>, <a class="Xr">nvmft(4)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">nvmf_che</code> module first appeared in
- <span class="Ux">FreeBSD 16.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">nvmf_che</code> module was developed by
- <span class="An">John Baldwin</span>
- &lt;<a class="Mt" href="mailto:jhb@FreeBSD.org">jhb@FreeBSD.org</a>&gt;
- under sponsorship from Chelsio Communications, Inc.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">November 14, 2025</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>