• Ben Hutchings's avatar
    sfc: Fix maximum number of TSO segments and minimum TX queue size · 7e6d06f0
    Ben Hutchings authored
    Currently an skb requiring TSO may not fit within a minimum-size TX
    queue.  The TX queue selected for the skb may stall and trigger the TX
    watchdog repeatedly (since the problem skb will be retried after the
    TX reset).  This issue is designated as CVE-2012-3412.
    
    Set the maximum number of TSO segments for our devices to 100.  This
    should make no difference to behaviour unless the actual MSS is less
    than about 700.  Increase the minimum TX queue size accordingly to
    allow for 2 worst-case skbs, so that there will definitely be space
    to add an skb after we wake a queue.
    
    To avoid invalidating existing configurations, change
    efx_ethtool_set_ringparam() to fix up values that are too small rather
    than returning -EINVAL.
    Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    7e6d06f0
tx.c 33.8 KB