Broadcom NetXtreme/NetLink BCM5718 Series Programmer's Manual page 320

BCM5718 Programmer's Guide
Name
HTX2B Programmable Jumbo
Frame Length
Reserved
TX-MBUF Burst Size
Do not insert GCM/GMAC IV
Do not drop if packet found
malformed
Do not drop if SA found in RX
direction
Do not drop if unsupported
IPV6 extension found or IPv4
option found
Do not drop if SA invalid
Do not drop if AH/ESP Header
not found
Enable TX AH Offload
Enable TX ESP Offload
TxMBUF corruption lockup fix
enable
Link Aware Enable
Enable Long Pause
Enable Big Backoff
Broadcom
®
January 29, 2016 • 5718-PG108-R
Default
Bits Access Value
22 RW 0
21 – –
20:17 RW 0000
16 RW 0
15 RW 0
14 RW 0
13 RW 0
12 RW 0
11 RW 0
10 RW 0
9 RW 0
8 RW 0
7 RW 0
6 RW 0
5 RW 0
Ethernet MAC (EMAC) Registers
Description
When this bit is 0:
Hardware automatically applies preset lengths to
detect jumbo frames for HTX2B.
When this bit is 1:
The jumbo frame length for HTX2B is
programmable via 0x464[23:16].
–
This filed determines the size of the MA read
performed by TCE.
0000 => burst-size 16
0001–01111 => reserved
1000 => burst-size 8
1001 => burst-size 9
.........
1111 => burst-size 15
If this bit is 0, an IV is generated by the chip and
inserted in an offloaded TX ESP or TX AH packet
in GCM or GMAC Cipher mode.
If this bit is 1, an IV is not inserted. Instead, the IV
is extracted from the TX frame.
These bit are there for debug purposes. Normally
an offloaded TX packet that does not adhere to
BCM5718 family limitations or does not
associate with a valid SA, unless the bit
corresponding to the error symptom is set to 1
here; in that case the particular error is
overlooked and the packet is transmitted in clear
text.
When such a packet is dropped in the chip, an
interrupt is generated.
A value 1 enables the TX AH offload feature.
When 0, offloaded AH packet gets dropped. This
value must be static.
A value 1 enables the TX ESP offload feature.
When 0, offloaded ESP packet gets dropped.
This value must be static.
When set, TXMBUF corruption lockup fix is
enabled.
When set, transmission of packets by the MAC is
enabled only when link is up.
When set, the Pause time value set in the
transmitted PAUSE frames is 0xFFFF.
The default value for PAUSE time is 0x1FFF
MAC will use larger than normal back-off
algorithm.
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