r1.10 of if_bnx.c effectively removed the limit on the number of segments in

the tx dma maps, apparently to allow heavily fragmented packets to be sent.

The tx ring accounting in bnx_start assumed that the longest fragment chain
we'd see was BNX_MAX_SEGMENTS, so sending a heavily fragmented packet when the
ring was already full could cause it to overflow.

In the 10 years since r1.10, we've started defragmenting packets if they
won't fit in the dma map, so we can limit the maps to BNX_MAX_SEGMENTS again.
While we're here, ensure there's always at least one slot on the tx ring free,
for consistency between drivers.

Fixes packet corruption seen by otto@
ok mpi@ dlg@

0 files changed, 0 insertions, 0 deletions