Hi guys,
A little review about the new bios (2.30) available for HP EliteDesk 705 G1 SFF/2215, BIOS L06 v02.30 03/22/2018.
It's change nothing about the TG3 driver= still crash (without iommu=soft, in my case) .... :(

[   80.864034] ------------[ cut here ]------------
[   80.864039] NETDEV WATCHDOG: eno1 (tg3): transmit queue 0 timed out
[   80.864081] WARNING: CPU: 1 PID: 0 at /home/khfeng/Sources/linux-lp1447664-xenial/net/sched/sch_generic.c:323 dev_watchdog+0x222/0x230
[   80.864082] Modules linked in: nls_iso8859_1 edac_mce_amd crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi aesni_intel aes_x86_64 hp_wmi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer shpchp snd crypto_simd glue_helper cryptd fam15h_power input_leds serio_raw sparse_keymap soundcore wmi_bmof k10temp tpm_infineon i2c_piix4 mac_hid ip_tables x_tables autofs4 amdkfd amd_iommu_v2 amdgpu chash radeon i2c_algo_bit ttm tg3 ptp psmouse pps_core drm_kms_helper wmi syscopyarea sysfillrect ahci sysimgblt fb_sys_fops libahci drm video
[   80.864136] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-9-generic #10~lp1447664+xenial
[   80.864137] Hardware name: Hewlett-Packard HP EliteDesk 705 G1 SFF/2215, BIOS L06 v02.30 03/22/2018
[   80.864141] RIP: 0010:dev_watchdog+0x222/0x230
[   80.864143] RSP: 0018:ffff9d3caec83e68 EFLAGS: 00010282
[   80.864146] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
[   80.864147] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff9d3caec96450
[   80.864149] RBP: ffff9d3caec83e98 R08: 0000000000000001 R09: 00000000000003da
[   80.864150] R10: 0000000000000000 R11: 00000000000003da R12: 0000000000000005
[   80.864152] R13: ffff9d3c9b4a4000 R14: ffff9d3c9b4a4478 R15: ffff9d3c9af34d80
[   80.864154] FS:  0000000000000000(0000) GS:ffff9d3caec80000(0000) knlGS:0000000000000000
[   80.864156] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   80.864158] CR2: 00002547c8b50c00 CR3: 000000022188c000 CR4: 00000000000406e0
[   80.864160] Call Trace:
[   80.864163]  <IRQ>
[   80.864168]  ? dev_graft_qdisc+0x70/0x70
[   80.864174]  call_timer_fn+0x32/0x140
[   80.864178]  run_timer_softirq+0x1ed/0x440
[   80.864182]  ? ktime_get+0x3e/0xa0
[   80.864186]  ? lapic_next_event+0x20/0x30
[   80.864192]  __do_softirq+0xf2/0x288
[   80.864196]  irq_exit+0xb6/0xc0
[   80.864200]  smp_apic_timer_interrupt+0x71/0x140
[   80.864204]  apic_timer_interrupt+0x9f/0xb0
[   80.864205]  </IRQ>
[   80.864210] RIP: 0010:cpuidle_enter_state+0xa7/0x300
[   80.864212] RSP: 0018:ffffbd7700d4fe60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
[   80.864215] RAX: ffff9d3caeca2840 RBX: 0000000000000002 RCX: 000000000000001f
[   80.864216] RDX: 0000000000000000 RSI: 0000000024a3c7c4 RDI: 0000000000000000
[   80.864218] RBP: ffffbd7700d4fe98 R08: ffff9d3caeca1664 R09: 0000000000000018
[   80.864219] R10: ffffbd7700d4fe30 R11: 000000000000011c R12: 0000000000000002
[   80.864221] R13: ffff9d3ca5f1b000 R14: ffffffffbf3802f8 R15: 00000012d3b48a8f
[   80.864226]  cpuidle_enter+0x17/0x20
[   80.864230]  call_cpuidle+0x23/0x40
[   80.864233]  do_idle+0x197/0x200
[   80.864236]  cpu_startup_entry+0x73/0x80
[   80.864239]  start_secondary+0x1a6/0x200
[   80.864243]  secondary_startup_64+0xa5/0xb0
[   80.864245] Code: 37 00 49 63 4e e8 eb 92 4c 89 ef c6 05 a7 ca d8 00 01 e8 92 3b fd ff 89 d9 48 89 c2 4c 89 ee 48 c7 c7 f0 51 f9 be e8 2e 74 80 ff <0f> ff eb c0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 c7 
[   80.864291] ---[ end trace 66fca4ee347f3dab ]---
[   80.864297] tg3 0000:03:00.0 eno1: transmit timed out, resetting
[   83.718667] tg3 0000:03:00.0 eno1: 0x00000000: 0x168714e4, 0x00100506, 0x02000010, 0x00000010
                                     (.............................................................................................)
[   83.719815] tg3 0000:03:00.0 eno1: 0x00007510: 0x00000000, 0xf4736ff5, 0x00000000, 0x00000000
[   83.719823] tg3 0000:03:00.0 eno1: 0: Host status block [00000001:000000f6:(0000:02f6:0000):(0000:0131)]
[   83.719829] tg3 0000:03:00.0 eno1: 0: NAPI info [000000f6:000000f6:(013b:0131:01ff):0000:(03c3:0000:0000:0000)]
[   83.719833] tg3 0000:03:00.0 eno1: 1: Host status block [00000001:0000008f:(0000:0000:0000):(0afb:0000)]
[   83.719838] tg3 0000:03:00.0 eno1: 1: NAPI info [0000008f:0000008f:(0000:0000:01ff):0afb:(02fb:02fb:0000:0000)]
[   83.719842] tg3 0000:03:00.0 eno1: 2: Host status block [00000001:000000db:(0000:0000:0000):(0000:0000)]
[   83.719847] tg3 0000:03:00.0 eno1: 2: NAPI info [000000db:000000db:(0000:0000:01ff):0000:(0000:0000:0000:0000)]
[   83.763859] tg3 0000:03:00.0 eno1: Link is down
[   87.316394] tg3 0000:03:00.0 eno1: Link is up at 1000 Mbps, full duplex
[   87.316410] tg3 0000:03:00.0 eno1: Flow control is off for TX and off for RX
[   87.316413] tg3 0000:03:00.0 eno1: EEE is enabled