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21ef2d065a
netdev_set_tc_queue() (and related helpers/drivers such as netdev_bind_sb_channel_queue(), netdev_reset_tc(), and netdev_unbind_sb_channel()) perform separate 16-bit writes to dev->tc_to_txq[tc].count and dev->tc_to_txq[tc].offset. Furthermore, memset() in netdev_reset_tc() and netdev_unbind_sb_channel() provides no guarantee of performing full 32-bit word stores. Concurrent lockless readers (e.g. skb_tx_hash(), netdev_txq_to_tc(), ixgbe_select_queue(), taprio, mqprio, FPE drivers) can observe torn values where offset and count belong to inconsistent configurations. Redefine struct netdev_tc_txq to embed count and offset inside a union with a u32 combined field, allowing atomic manipulation via READ_ONCE() and WRITE_ONCE(). Update all lockless readers and writers across the kernel to use READ_ONCE() and WRITE_ONCE() on the combined field. Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20260812085440.3917924-2-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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