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参数资料
型号： 4450HG/3-K
厂商： EXAR CORP
元件分类： 微控制器/微处理器
英文描述： MICROPROCESSOR, PBGA324
封装： ROHS COMPLIANT, HSBGA-324
文件页数： 17/92页
文件大小： 780K
代理商： 4450HG/3-K
4450 – Data Sheet, DS-0131-06
Page 24
Hifn Confidential
4.2 4450 Packet Processing Operation
Inbound packets arrive over the network-side GMAC interface typically connected to the
PHY device. The packet's payload is buffered and the DPU classifies the header as being
IPsec and/or IPcomp and uses the SPI, protocol, destination address, ethernet interface,
and VLAN ID to look-up the SA. Upon successful look-up, the DPU forwards the SA
information along with the packet to the crypto algorithm processors. The DPU then
performs the anti-replay check, and a post-crypto inbound policy check. The DPU then
updates the SA with adjusted sequence numbers and packet/byte counters. The decoded
packet is then egressed out the host GMAC port typically connected to the host subsystem.
Figure 4-2. 4450 Processing Steps
Any errors in this process are captured to the eSC processor (or optionally the host) for
statistics logging. Non-IPsec packets are checked against the SPD policy database and
either discarded or forwarded to the host MAC port, depending on policy. IPsec packet
fragments are forwarded to the host side MAC port for off-chip reassembly. The
reassembled packets are then returned via the outbound MAC port with appropriate
messaging, and re-inserted for inbound IPsec processing. Optionally, packet reassembly
may occur on-chip in the eSC processor.
Outbound packets arrive over the Ethernet GMAC interface connected to the host-side
media access (MAC) port. The packet's payload is buffered and the DPU performs a SPD
policy look-up (based on the selectors defined for the security protocol), and then a SA
look-up (based on the selectors defined for the security protocol), and checks the SA
lifetime counters. The DPU also checks for exceptions and fragmentation. Upon successful
SAL
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Li
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-
Laye
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From
Host
To
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SA
D
RA
M
SAD
RAM
Post
-
Cry
pt
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P
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essi
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Po
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ry
pto
Pr
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es
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Crypt
o
&
Compression
Processing
Crypto &
Compression
Processing
SA
Fetch
SA
Fetch
SA
Lookup
SA
Lookup
Polic
y
Lookup
Policy
Lookup
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&
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xtract
ion
IP
H
d
r
C
hec
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&
Extr
ac
tion
SA Mask
Polic
y
TCA
M
Policy
TCAM
Et
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Li
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-
La
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Et
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-
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aye
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To
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From
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Po
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Cr
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Pro
cessi
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Pos
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P
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Polic
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Selecto
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Che
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Selector
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SA
D
RA
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SAD
RAM
SAL
SA
Lookup
SA
Lookup
SA
Fetch
SA
Fetch
Crypt
o
&
Decompressio
n
Processing
Crypto &
Decompression
Processing
SAD = SA Database
SAL = SA Lookup table
TCAM = Ternary Content - Addressable Memory
Inbound
Outbound
250 SA’s
On-chip
200 SA’s
On-chip
IPsec/ IPcomp
VLAN tag
Ethernet Channel # (0 or 1)
Dest
Source &
IP address
Protocol (TCP/UDP/ICMP …)
Port numbers
Source & Dest
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