CFBMC-2788: AFF A800, AFF C800, ASA A800 or ASA C800 systems might report TCP checksum errors for e0S internal port

Issue

On AFF A800, AFF C800, ASA A800 or ASA C800 all-flash storage systems running with BMC firmware version 10.8,
ONTAP might log "netif.tcp.conn.bad.checksum:error" events for the e0S internal port.
The following are examples of the event message:
netif.tcp.conn.bad.checksum: TCP packet with bad checksum detected on port e0S.
The packet arrived on connection with source address 192.0.2.81 and destination_address 192.0.2.84
or
netif.tcp.conn.bad.checksum: TCP packet with bad checksum detected on port e0S.
The packet arrived on connection with source address 192.0.2.82 and destination_address 192.0.2.85
The following is an example of nodeshell "ifstat -a" output showing the "Bad TCP cksum" counter:
[-- interface e0S (19 days, 2 hours, 9 minutes, 10 seconds) --
RECEIVE
Total frames: 18913k | Frames/second: 13 | Total bytes: 1724m
Bytes/second: 1278 | Total errors: 0 | Errors/minute: 0
Total discards: 0 | Discards/minute: 0 | Multi/broadcast: 2082
Non-primary u/c: 0 | Errored frames: 0 | Unsupported Op: 0
CRC errors: 0 | Runt frames: 0 | Fragment: 0
Long frames: 0 | Jabber: 0 | Length errors: 0
Alignment errors: 0 | No buffer: 0 | Xon: 0
Xoff: 0 | Jumbo: 0 | Noproto: 0
Error symbol: 0 | Illegal symbol: 0 | Bus overruns: 0
Queue drops: 0 | LRO segments: 0 | LRO bytes: 0
LRO6 segments: 0 | LRO6 bytes: 0 | Bad UDP cksum: 0
Bad UDP6 cksum: 0 | Bad TCP cksum: 1429 | Bad TCP6 cksum: 0 <<<<<<<
Mcast v6 solicit: 0 | Lagg errors: 0 | Lacp errors: 0
Lacp PDU errors: 0]