netxen: napi and irq cleanup

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o separate and simpler irq handler for msi interrupts, avoids few checks
  than legacy mode.
o avoid redudant tx_has_work() and rx_has_work() checks in interrupt
  and napi, which can uncork irq based on racy (lockless) access to tx
  and rx ring indices. If we get interrupt, there's sufficient reason to
  schedule napi.
o replenish rx ring more often, remove self-imposed threshold rcv_free
  that prevents posting rx desc to card. This improves performance in
  low memory.

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Tested-by: Vernon Mauery <mauery@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

...

This commit is contained in:

Dhananjay Phadke 2008-03-17 19:59:49 -07:00 • committed by Jeff Garzik

parent 443be7960b

commit 05aaa02d79

4 changed files with 48 additions and 163 deletions

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5

drivers/net/netxen/netxen_nic.h

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76

drivers/net/netxen/netxen_nic_init.c

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17

drivers/net/netxen/netxen_nic_isr.c

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113

drivers/net/netxen/netxen_nic_main.c

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