CVS commit: src/sys/dev/pci/ixgbe

["SAITOH Masanobu" <msaitoh%netbsd.org@localhost>]

Module Name:    src
Committed By:   msaitoh
Date:           Wed Aug 18 09:17:17 UTC 2021

Modified Files:
        src/sys/dev/pci/ixgbe: ix_txrx.c

Log Message:
 Refresh unrefreshed descriptors' buffers correctly.

- Update next_to_refresh at least before ixgbe_rx_unrefresed() to detect
  the unrefreshed status correctly in ixgbe_rxeof().
- next_to_refresh points to the previous entry of the first unrefreshed
  descriptor, so fix a loop variable to point to the correct one in
  ixgbe_refresh_mbufs().
- Without the above two fixes, RX ring may have some unrefreshed entries
  which have inconsistent state. On such state, "ifconfig down up" causes
  panic in bus_dmamap_sync() on aarch64.
- Tested on amd64 and aarch64. OK'd by knakahara.


To generate a diff of this commit:
cvs rdiff -u -r1.81 -r1.82 src/sys/dev/pci/ixgbe/ix_txrx.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.