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Disable retrying RX descriptor loading. The counter is used to set

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number of retry to be performed whenever controller found RX
descriptor was empty. RX empty interrupt is generated only when the
retry counter is over. Experimentation shows retrying RX descriptor
loading increased number of dropped frames under flow-control
enabled environments so disable it and have controller generate RX
empty interrupt as fast as it can.
While I'm here fix RXCSR_DESC_RT_CNT macro.
This commit is contained in:
Pyun YongHyeon 2010-11-26 01:48:29 +00:00
parent b443638277
commit cd96c3c984
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=215847
1 changed files with 2 additions and 2 deletions
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4
sys/dev/jme/if_jmereg.h
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@ -275,8 +275,8 @@
#define RXCSR_RXQ2 2
#define RXCSR_RXQ3 3
#define RXCSR_DESC_RT_CNT(x) \
((((x) / 4) << RXCSR_DESC_RT_CNT_SHIFT) & RXCSR_DESC_RT_CNT_MASK)
#define RXCSR_DESC_RT_CNT_DEFAULT 32
(((x) << RXCSR_DESC_RT_CNT_SHIFT) & RXCSR_DESC_RT_CNT_MASK)
#define RXCSR_DESC_RT_CNT_DEFAULT 0
/* Rx queue descriptor base address. 16bytes alignment needed. */
#define JME_RXDBA_LO 0x0024