ethtool是用來查詢和設定網絡卡驅動&硬體資訊的工具，功能很強大！linux一般都會預設安裝，在進行網路除錯和網路效能分析時非常有用。提供統計資訊查詢、ring buffer設定、協議解除安裝設定、網絡卡測試等等……自己在進行ddos攻擊模擬、分析和測試中經常使用！
以網絡卡p5p2為例
[root@globus03 20160924]# ethtool -g p5p2
ring parameters for p5p2:
pre-set maximums:
rx:4078
rx mini: 0
rx jumbo: 0
tx:4078
current hardware settings:
rx:2014
rx mini: 0
rx jumbo: 0
tx:4078
[root@globus03 20160924]# ethtool -g p5p2 rx 4078
[root@globus03 20160924]# ethtool -g p5p2
ring parameters for p5p2:
pre-set maximums:
rx:4078
rx mini: 0
rx jumbo: 0
tx:4078
current hardware settings:
rx:4078
rx mini: 0
rx jumbo: 0
tx:4078
[root@globus03
20160924]# ethtool -i p5p2
driver: bnx2x
version: 1.710
.51-0
firmware-version: ffv7.12
.19 bc 7.12
.5 phy 1.45
bus-info: 0000:06:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
[root@globus03 20160924]# ethtool p5p2
settings for p5p2:
supported ports: [ tp ]
supported link modes: 100baset/half 100baset/full
1000baset/full
10000baset/full
supported pause frame use: symmetric receive-only
supports auto-negotiation: yes
advertised link modes: 100baset/half 100baset/full
1000baset/full
10000baset/full
advertised pause frame use: symmetric receive-only
advertised auto-negotiation: yes
link partner advertised link modes: 100baset/half 100baset/full
1000baset/half 1000baset/full
10000baset/full
link partner advertised pause frame use: no
link partner advertised auto-negotiation: yes
speed: 10000mb/s
duplex: full
port: twisted pair
phyad: 17
transceiver: internal
auto-negotiation: on
mdi-x: unknown
supports wake-on: g
wake-on: d
current message level: 0x00000000 (0)
link detected: yes
[root@globus03 ~]# ethtool -t p5p2 online
the test result is pass
the test extra info:
register_test
(offline) 0
memory_test
(offline) 0
int_loopback_test
(offline) 0
ext_loopback_test
(offline) 0
nvram_test
(online) 0
interrupt_test
(online) 0
link_test
(online) 0
[root@globus03 ~]# ethtool -s em2 | grep -i error
rx_fcs_errors: 0
rx_align_errors: 0
rx_frame_too_long_errors: 0
rx_in_length_errors: 0
rx_out_length_errors: 0
tx_mac_errors: 0
tx_carrier_sense_errors: 0
tx_errors: 0
[root@globus03 ~]# ethtool -s em2 | grep -i rx
rx_octets:
0rx_fragments:
0rx_ucast_packets:
0rx_mcast_packets:
0rx_bcast_packets:
0rx_fcs_errors:
0…………
offload 是將本來該作業系統進行的一些資料報處理（如分片、重組等）放到網絡卡硬體中去做，降低系統 cpu 消耗的同時，提高處理的效能。
[root@globus03 ~]# ethtool -k p5p2
features for
p5p2:
rx-checksumming: on
tx-checksumming: on
tx-checksum-ipv4: on
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: on
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: on
tx-scatter-gather: on
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: on
tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on [fixed]
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
tx-gre-segmentation: on
tx-ipip-segmentation: on
tx-sit-segmentation: on
tx-udp_tnl-segmentation: on
tx-mpls-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off
rx-fcs: off [fixed]
rx-all: off [fixed]
tx-vlan-stag-hw-insert: off [fixed]
rx-vlan-stag-hw-parse: off [fixed]
rx-vlan-stag-filter: off [fixed]
busy-poll: on [fixed]
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