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platform: detect EINVAL as failure to set the MTU

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Some drivers will reject an invalid MTU size with EINVAL.

Quote from [1]:

  While investigating, I did notice that do_change_link in
  nm-linux-platform.c really ought to count -EINVAL as an MTU out-of-range
  error and not just -ERANGE. Even if the hardware supports a large MTU,
  if the transmit FIFO is set too small, stmmac_change_mtu [2] will return
  -EINVAL. For example, on my device, the maxmtu is 9000 but in practice I
  can't set an MTU larger than 4096 unless I first run ethtool
  --set-channels eno1 tx 3.

[1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1198#note_1738311
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c?h=v6.1#n5577
This commit is contained in:
Thomas Haller 2023-01-25 09:03:49 +01:00
parent fce8e572d0
commit 621b41ebfa
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GPG key ID: 29C2366E4DFC5728
1 changed files with 2 additions and 1 deletions
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3
src/libnm-platform/nm-linux-platform.c
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@ -8217,7 +8217,8 @@ retry:
} else if (NM_IN_SET(seq_result, -ESRCH, -ENOENT)) {
log_detail = ", firmware not found";
result = -NME_PL_NO_FIRMWARE;
} else if (NM_IN_SET(seq_result, -ERANGE) && change_link_type == CHANGE_LINK_TYPE_SET_MTU) {
} else if (NM_IN_SET(seq_result, -ERANGE, -EINVAL)
&& change_link_type == CHANGE_LINK_TYPE_SET_MTU) {
log_detail = ", setting MTU to requested size is not possible";
result = -NME_PL_CANT_SET_MTU;
} else if (NM_IN_SET(seq_result, -ENFILE) && change_link_type == CHANGE_LINK_TYPE_SET_ADDRESS