Date: Sat, 14 Nov 2015 00:30:39 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: freebsd-stable@freebsd.org Subject: NETMAP and off-by-one? Message-ID: <20151113213039.GK48728@zxy.spb.ru>
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I am see strange things: like NETMAP stop transmit after `head` and `cur`
touch `tail`.
But:
/*
* check if space is available in the ring.
*/
static inline int
nm_ring_empty(struct netmap_ring *ring)
{
return (ring->cur == ring->tail);
}
i.e. if cur == (tail-1) mod ring_size -- space is available in the
ring and I can put packet in output buffer.
After put this packet ring is full, but no transmiting.
This is bug?
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