ionic: update doc files

Update the basic doc file with some configuration hints and a
little bit of stats information.

Signed-off-by: Shannon Nelson <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/device_drivers/pensando/ionic.rst

···
 ========
 
 - Identifying the Adapter
+- Enabling the driver
+- Configuring the driver
+- Statistics
 - Support
 
 Identifying the Adapter
···
 messages such as these::
 
   $ dmesg | grep ionic
-  ionic Pensando Ethernet NIC Driver, ver 0.15.0-k
+  ionic 0000:b5:00.0: 126.016 Gb/s available PCIe bandwidth (8.0 GT/s PCIe x16 link)
   ionic 0000:b5:00.0 enp181s0: renamed from eth0
+  ionic 0000:b5:00.0 enp181s0: Link up - 100 Gbps
+  ionic 0000:b6:00.0: 126.016 Gb/s available PCIe bandwidth (8.0 GT/s PCIe x16 link)
   ionic 0000:b6:00.0 enp182s0: renamed from eth0
+  ionic 0000:b6:00.0 enp182s0: Link up - 100 Gbps
+
+Driver and firmware version information can be gathered with either of
+ethtool or devlink tools::
+
+  $ ethtool -i enp181s0
+  driver: ionic
+  version: 5.7.0
+  firmware-version: 1.8.0-28
+  ...
+
+  $ devlink dev info pci/0000:b5:00.0
+  pci/0000:b5:00.0:
+    driver ionic
+    serial_number FLM18420073
+    versions:
+        fixed:
+          asic.id 0x0
+          asic.rev 0x0
+        running:
+          fw 1.8.0-28
+
+See Documentation/networking/devlink/ionic.rst for more information
+on the devlink dev info data.
+
+Enabling the driver
+===================
+
+The driver is enabled via the standard kernel configuration system,
+using the make command::
+
+  make oldconfig/menuconfig/etc.
+
+The driver is located in the menu structure at:
+
+  -> Device Drivers
+    -> Network device support (NETDEVICES [=y])
+      -> Ethernet driver support
+        -> Pensando devices
+          -> Pensando Ethernet IONIC Support
+
+Configuring the Driver
+======================
+
+MTU
+---
+
+Jumbo frame support is available with a maximim size of 9194 bytes.
+
+Interrupt coalescing
+--------------------
+
+Interrupt coalescing can be configured by changing the rx-usecs value with
+the "ethtool -C" command.  The rx-usecs range is 0-190.  The tx-usecs value
+reflects the rx-usecs value as they are tied together on the same interrupt.
+
+SR-IOV
+------
+
+Minimal SR-IOV support is currently offered and can be enabled by setting
+the sysfs 'sriov_numvfs' value, if supported by your particular firmware
+configuration.
+
+Statistics
+==========
+
+Basic hardware stats
+--------------------
+
+The commands ``netstat -i``, ``ip -s link show``, and ``ifconfig`` show
+a limited set of statistics taken directly from firmware.  For example::
+
+  $ ip -s link show enp181s0
+  7: enp181s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
+      link/ether 00:ae:cd:00:07:68 brd ff:ff:ff:ff:ff:ff
+      RX: bytes  packets  errors  dropped overrun mcast
+      414        5        0       0       0       0
+      TX: bytes  packets  errors  dropped carrier collsns
+      1384       18       0       0       0       0
+
+ethtool -S
+----------
+
+The statistics shown from the ``ethtool -S`` command includes a combination of
+driver counters and firmware counters, including port and queue specific values.
+The driver values are counters computed by the driver, and the firmware values
+are gathered by the firmware from the port hardware and passed through the
+driver with no further interpretation.
+
+Driver port specific::
+
+     tx_packets: 12
+     tx_bytes: 964
+     rx_packets: 5
+     rx_bytes: 414
+     tx_tso: 0
+     tx_tso_bytes: 0
+     tx_csum_none: 12
+     tx_csum: 0
+     rx_csum_none: 0
+     rx_csum_complete: 3
+     rx_csum_error: 0
+
+Driver queue specific::
+
+     tx_0_pkts: 3
+     tx_0_bytes: 294
+     tx_0_clean: 3
+     tx_0_dma_map_err: 0
+     tx_0_linearize: 0
+     tx_0_frags: 0
+     tx_0_tso: 0
+     tx_0_tso_bytes: 0
+     tx_0_csum_none: 3
+     tx_0_csum: 0
+     tx_0_vlan_inserted: 0
+     rx_0_pkts: 2
+     rx_0_bytes: 120
+     rx_0_dma_map_err: 0
+     rx_0_alloc_err: 0
+     rx_0_csum_none: 0
+     rx_0_csum_complete: 0
+     rx_0_csum_error: 0
+     rx_0_dropped: 0
+     rx_0_vlan_stripped: 0
+
+Firmware port specific::
+
+     hw_tx_dropped: 0
+     hw_rx_dropped: 0
+     hw_rx_over_errors: 0
+     hw_rx_missed_errors: 0
+     hw_tx_aborted_errors: 0
+     frames_rx_ok: 15
+     frames_rx_all: 15
+     frames_rx_bad_fcs: 0
+     frames_rx_bad_all: 0
+     octets_rx_ok: 1290
+     octets_rx_all: 1290
+     frames_rx_unicast: 10
+     frames_rx_multicast: 5
+     frames_rx_broadcast: 0
+     frames_rx_pause: 0
+     frames_rx_bad_length: 0
+     frames_rx_undersized: 0
+     frames_rx_oversized: 0
+     frames_rx_fragments: 0
+     frames_rx_jabber: 0
+     frames_rx_pripause: 0
+     frames_rx_stomped_crc: 0
+     frames_rx_too_long: 0
+     frames_rx_vlan_good: 3
+     frames_rx_dropped: 0
+     frames_rx_less_than_64b: 0
+     frames_rx_64b: 4
+     frames_rx_65b_127b: 11
+     frames_rx_128b_255b: 0
+     frames_rx_256b_511b: 0
+     frames_rx_512b_1023b: 0
+     frames_rx_1024b_1518b: 0
+     frames_rx_1519b_2047b: 0
+     frames_rx_2048b_4095b: 0
+     frames_rx_4096b_8191b: 0
+     frames_rx_8192b_9215b: 0
+     frames_rx_other: 0
+     frames_tx_ok: 31
+     frames_tx_all: 31
+     frames_tx_bad: 0
+     octets_tx_ok: 2614
+     octets_tx_total: 2614
+     frames_tx_unicast: 8
+     frames_tx_multicast: 21
+     frames_tx_broadcast: 2
+     frames_tx_pause: 0
+     frames_tx_pripause: 0
+     frames_tx_vlan: 0
+     frames_tx_less_than_64b: 0
+     frames_tx_64b: 4
+     frames_tx_65b_127b: 27
+     frames_tx_128b_255b: 0
+     frames_tx_256b_511b: 0
+     frames_tx_512b_1023b: 0
+     frames_tx_1024b_1518b: 0
+     frames_tx_1519b_2047b: 0
+     frames_tx_2048b_4095b: 0
+     frames_tx_4096b_8191b: 0
+     frames_tx_8192b_9215b: 0
+     frames_tx_other: 0
+     frames_tx_pri_0: 0
+     frames_tx_pri_1: 0
+     frames_tx_pri_2: 0
+     frames_tx_pri_3: 0
+     frames_tx_pri_4: 0
+     frames_tx_pri_5: 0
+     frames_tx_pri_6: 0
+     frames_tx_pri_7: 0
+     frames_rx_pri_0: 0
+     frames_rx_pri_1: 0
+     frames_rx_pri_2: 0
+     frames_rx_pri_3: 0
+     frames_rx_pri_4: 0
+     frames_rx_pri_5: 0
+     frames_rx_pri_6: 0
+     frames_rx_pri_7: 0
+     tx_pripause_0_1us_count: 0
+     tx_pripause_1_1us_count: 0
+     tx_pripause_2_1us_count: 0
+     tx_pripause_3_1us_count: 0
+     tx_pripause_4_1us_count: 0
+     tx_pripause_5_1us_count: 0
+     tx_pripause_6_1us_count: 0
+     tx_pripause_7_1us_count: 0
+     rx_pripause_0_1us_count: 0
+     rx_pripause_1_1us_count: 0
+     rx_pripause_2_1us_count: 0
+     rx_pripause_3_1us_count: 0
+     rx_pripause_4_1us_count: 0
+     rx_pripause_5_1us_count: 0
+     rx_pripause_6_1us_count: 0
+     rx_pripause_7_1us_count: 0
+     rx_pause_1us_count: 0
+     frames_tx_truncated: 0
+
 
 Support
 =======
+
 For general Linux networking support, please use the netdev mailing
 list, which is monitored by Pensando personnel::