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netxen: remove low level tx lock

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o eliminate tx lock in netxen adapter struct, instead pound on netdev
  tx lock appropriately.
o remove old "concurrent transmit" code that unnecessarily drops and
  reacquires tx lock in hard_xmit_frame(), this is already serialized
  the netdev xmit lock.
o reduce scope of tx lock in tx cleanup. tx cleanup operates on
  different section of the ring than transmitting cpus and is
  guarded by producer and consumer indices. This fixes a race
  caused by rx softirq preemption on realtime kernels.

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 19:59:50 -07:00
committed by Jeff Garzik
parent 05aaa02d79
commit ba53e6b487
4 changed files with 43 additions and 157 deletions
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2
drivers/net/netxen/netxen_nic_ethtool.c
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@ -70,9 +70,7 @@ static const struct netxen_nic_stats netxen_nic_gstrings_stats[] = {
{"uphcong", NETXEN_NIC_STAT(stats.uphcong)},
{"upmcong", NETXEN_NIC_STAT(stats.upmcong)},
{"updunno", NETXEN_NIC_STAT(stats.updunno)},
{"skb_freed", NETXEN_NIC_STAT(stats.skbfreed)},
{"tx_dropped", NETXEN_NIC_STAT(stats.txdropped)},
{"tx_null_skb", NETXEN_NIC_STAT(stats.txnullskb)},
{"csummed", NETXEN_NIC_STAT(stats.csummed)},
{"no_rcv", NETXEN_NIC_STAT(stats.no_rcv)},
{"rx_bytes", NETXEN_NIC_STAT(stats.rxbytes)},