Make some tweaks to the RealTek driver:

- Fix a bug in rl_rxeof() handler: in the case where the packet wraps
  from the end of the receive buffer back to the beginning, we need to
  insure that at least sizeof(ether_header) bytes make it into the first
  mbuf. If we don't, then doing eh = mtod(m, struct ether_header *)
  loses. To avoid this, we use m_pullup() to suck at least MHLEN -
  RL_ETHER_ALIGN bytes into the first mbuf, which should also help
  small packets fit into a single mbuf.

  Pointed out by: Philip A. Prindeville <philipp@zembu.com>

- Make the transmit threshold autotuning: start off with a small value
  and jack it up when TX underruns are detected.

- Also improve TX error recovery: kick the chip in the head with a
  reset/init sequence to make sure it recovers afer a transmit error.

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h
index 8654f7e..0bb9ffc 100644
--- a/sys/pci/if_rlreg.h
+++ b/sys/pci/if_rlreg.h
@@ -299,7 +299,8 @@
 #define RL_RXBUFLEN		(1 << ((RL_RX_BUF_SZ >> 11) + 13))
 #define RL_TX_LIST_CNT		4
 #define RL_MIN_FRAMELEN		60
-#define RL_TX_EARLYTHRESH	(256 << 11)
+#define RL_TXTHRESH(x)		((x) << 11)
+#define RL_TX_THRESH_INIT	96
 #define RL_RX_FIFOTHRESH	RL_RXFIFO_256BYTES
 #define RL_RX_MAXDMA		RL_RXDMA_UNLIMITED
 #define RL_TX_MAXDMA		RL_TXDMA_2048BYTES
@@ -364,6 +365,7 @@ struct rl_softc {
 	u_int8_t		rl_unit;	/* interface number */
 	u_int8_t		rl_type;
 	u_int8_t		rl_stats_no_timeout;
+	int			rl_txthresh;
 	struct rl_chain_data	rl_cdata;
 	struct callout_handle	rl_stat_ch;
 };