128747ab0b
The receive function em_process_receive_interrupts() unlocks the adapter while ether_input() processes the packet, and then locks it back. In the meantime, em_init() may be called, either from em_watchdog() from softclock interrupt or from the ifconfig(8) program. The em_init() resets the card, in particular it sets adapter->next_rx_desc_to_check to 0 and resets hardware RX Head and Tail descriptor pointers. The loop in em_process_receive_interrupts() does not expect these things to change, and a mess may result. This fixes long wedges of em(4) interfaces receive part under high load and IP fastforwarding enabled. PR: kern/87418 Submitted by: Dmitrij Tejblum <tejblum yandex-team.ru>
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