tg3: Adjust rx prod ring bd replenish thresholds

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The oldest tg3 devices had large rx producer ring BD caches.  Back then,
it made sense to make the BD cache replenish threshold only a function
of the number of rx buffers posted by the driver.  Since then, the BD
cache sizes have shrunk to 25% of their original size and, in some
cases, the ring sizes have quadrupled in size.  Under such conditions,
static BD cache replenish thresholds no longer match the hardware
constraints.

This patch attempts to factor in the BD cache size into the bd cache
replenish strategy, taking the existing hardware bugs into account.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Matt Carlson 2011-04-20 07:57:36 +00:00 • committed by David S. Miller

parent 4d95847381

commit eb07a9408e

2 changed files with 53 additions and 23 deletions

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67

drivers/net/tg3.c

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9

drivers/net/tg3.h

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