1 .\" Copyright (c) 2008 Pyun YongHyeon
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13 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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25 .\" $FreeBSD: src/share/man/man4/jme.4,v 1.1 2008/05/27 01:59:17 yongari Exp $
26 .\" $DragonFly: src/share/man/man4/jme.4,v 1.3 2008/07/27 19:38:58 swildner Exp $
33 .Nd JMicron Gigabit/Fast Ethernet driver
35 To compile this driver into the kernel,
36 place the following lines in your
37 kernel configuration file:
38 .Bd -ragged -offset indent
43 Alternatively, to load the driver as a
44 module at boot time, place the following line in
46 .Bd -literal -offset indent
52 device driver provides support for JMicron JMC250 PCI Express
53 Gigabit Ethernet controllers and JMicron JMC260 PCI Express Fast
56 All LOMs supported by the
58 driver have TCP/UDP/IP checksum offload for both transmit and receive,
59 .\" TCP segmentation offload (TSO),
60 hardware VLAN tag stripping/insertion features,
62 an interrupt coalescing/moderation mechanism as well as
63 a 64-bit multicast hash filter.
65 The JMC250 also supports Jumbo Frames (up to 9216 bytes), which can be
66 configured via the interface MTU setting.
67 Selecting an MTU larger than 1500 bytes with the
69 utility configures the adapter to receive and transmit Jumbo Frames.
73 driver supports the following media types:
74 .Bl -tag -width ".Cm 10baseT/UTP"
76 Enable autoselection of the media type and options.
77 The user can manually override
78 the autoselected mode by adding media options to
83 Set 100Mbps (Fast Ethernet) operation.
85 Set 1000baseT operation over twisted pair.
90 driver supports the following media options:
91 .Bl -tag -width ".Cm full-duplex"
93 Force full duplex operation.
95 Force half duplex operation.
98 For more information on configuring this device, see
105 A number of per-interface variables are implemented in the
110 .Bl -tag -width "rx_ring_count"
112 Maximum amount of time to delay for TX completion interrupt in
114 The accepted range is 1 to 65535, the default is 65535 (65535us).
116 Maximum number of packets to fire TX completion interrupt.
117 The accepted range is 0 to 255, the default is 64.
118 Packet count based TX interrupt coalescing could be disabled
119 by setting this variable to 0.
121 Maximum amount of time to delay for RX completion interrupt in
123 The accepted range is 1 to 65535, the default is 100 (100us).
125 Maximum number of packets to fire RX completion interrupt.
126 The accepted range is 0 to 255, the default is 64.
127 Packet count based RX interrupt coalescing could be disabled
128 by setting this variable to 0.
130 Number of RX descriptors per-ring (read-only).
132 .Va hw.jme.rx_desc_count
135 Number of TX descriptors (read-only).
137 .Va hw.jme.tx_desc_count
140 Number of RX rings (read-only).
142 .Va hw.jme.rx_ring_count
145 Number of RX rings being used (read-only).
160 driver was written by
162 .Aq yongari@FreeBSD.org .
165 and was imported into