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Set the number of RX frames to receive after RX MBUF low watermark

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has reached. This reduced number of dropped frames when
flow-control is enabled. Previously it dropped incoming frames once
RX MBUF low watermark has reached. The value used in MAC RX MBUF
low watermark is greater than or equal to 4 so receiving two more
RX frames should not be a problem.

Obtained from:	OpenBSD
This commit is contained in:
Pyun YongHyeon 2010-09-29 00:00:45 +00:00
parent 8d74ca8ce9
commit dedcdf574b
2 changed files with 9 additions and 0 deletions
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8
sys/dev/bge/if_bge.c
View File

@ -4220,6 +4220,14 @@ bge_init_locked(struct bge_softc *sc)
/* Turn on receiver. */
BGE_SETBIT(sc, BGE_RX_MODE, BGE_RXMODE_ENABLE);
/*
* Set the number of good frames to receive after RX MBUF
* Low Watermark has been reached. After the RX MAC receives
* this number of frames, it will drop subsequent incoming
* frames until the MBUF High Watermark is reached.
*/
CSR_WRITE_4(sc, BGE_MAX_RX_FRAME_LOWAT, 2);
/* Tell firmware we're alive. */
BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);

1
sys/dev/bge/if_bgereg.h
View File

@ -632,6 +632,7 @@
#define BGE_RX_BD_RULES_CTL15 0x04F8
#define BGE_RX_BD_RULES_MASKVAL15 0x04FC
#define BGE_RX_RULES_CFG 0x0500
#define BGE_MAX_RX_FRAME_LOWAT 0x0504
#define BGE_SERDES_CFG 0x0590
#define BGE_SERDES_STS 0x0594
#define BGE_SGDIG_CFG 0x05B0