• Eric Dumazet's avatar
    net: ena: remove ndo_poll_controller · 21627982
    Eric Dumazet authored
    As diagnosed by Song Liu, ndo_poll_controller() can
    be very dangerous on loaded hosts, since the cpu
    calling ndo_poll_controller() might steal all NAPI
    contexts (for all RX/TX queues of the NIC). This capture
    can last for unlimited amount of time, since one
    cpu is generally not able to drain all the queues under load.
    
    ena uses NAPI for TX completions, so we better let core
    networking stack call the napi->poll() to avoid the capture.
    Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
    Cc: Netanel Belgazal <netanel@amazon.com>
    Cc: Saeed Bishara <saeedb@amazon.com>
    Cc: Zorik Machulsky <zorik@amazon.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    21627982
ena_netdev.c 93 KB