John Fastabend 4f8a91ad9a ixgbe: align flow control DV macros with datasheet ... The flow control DV macros are used to calculate the flow control high and low thresholds. This patch annotates these macros slightly better and fixes the issues below. The macro variables are renamed LINK to _max_frame_link and TC to _max_frame_tc. This was to avoid confusion and make them more readable. It was found that people auditing the code read TC to be 'traffic class' in the 802.1Q definition instead of the max frame size of the tc. Hopefully it is clear now. This audit also found the following real deviations from the theoretical values. Fixed in this patch. * I multiplied the DV calculations by (36/25) which always evaluates to 1. This does not match the intended theoretical value of 1.44. * IXGBE_BT2KB added 1023 to account for rounding however this really should be 8 * 1023 - 1 to account for division by 8k. * x2 multiplication of max frame in DV calculations to account for updated hardware recommendations. With this patch the DV values are inline with the recommendations in the 82599 and 82598 data sheets. Its worth noting I did not see any dropped frames with flow control on in my experiments without this patch. However aligning with the hardware specs and recommendations seems like a good idea here to account for worst case scenarios. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Tested-by: Ross Brattain <ross.b.brattain@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>		2012-06-14 03:12:17 -07:00
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3com	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
8390	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
adaptec	starfire: remove deprecated options.	2012-04-07 11:45:26 +02:00
adi	bfin: Fix build failure due to get_ts_info() changes.	2012-04-06 00:17:50 -04:00
aeroflex	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
alteon	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
amd	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
apple	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
atheros	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
broadcom	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-12 21:59:18 -07:00
brocade	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
cadence	net/at91_ether: use gpio_to_irq for phy IRQ line	2012-04-28 21:48:39 -04:00
calxeda	net: use eth_hw_addr_random() and reset addr_assign_type	2012-02-15 15:34:17 -05:00
chelsio	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
cirrus	cirrus: cs89x0: Remove function prototypes and reorder declarations	2012-05-18 23:48:07 -04:00
cisco	drivers/net: Convert compare_ether_addr to ether_addr_equal	2012-05-10 23:33:01 -04:00
davicom	dm9000: some coldfire boards need this	2012-05-14 18:40:16 -04:00
dec	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
dlink	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-05-07 23:35:40 -04:00
emulex	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-12 21:59:18 -07:00
faraday	net: replace random_ether_addr() with eth_hw_addr_random()	2012-02-15 15:34:16 -05:00
freescale	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
fujitsu	drivers/net: delete all code/drivers depending on CONFIG_MCA	2012-05-17 16:37:41 -04:00
hp	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
i825xx	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
ibm	ehea: fix losing of NEQ events when one event occurred early	2012-05-10 22:45:54 -04:00
icplus
intel	ixgbe: align flow control DV macros with datasheet	2012-06-14 03:12:17 -07:00
marvell	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-12 21:59:18 -07:00
mellanox	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
micrel	net/ethernet: ks8851_mll unregister_netdev() before freeing	2012-06-07 13:15:09 -07:00
microchip	net: use eth_hw_addr_random() and reset addr_assign_type	2012-02-15 15:34:17 -05:00
myricom	myri10ge: stop using net_device.{base_addr, irq}.	2012-04-07 11:58:09 +02:00
natsemi	drivers/net: delete all code/drivers depending on CONFIG_MCA	2012-05-17 16:37:41 -04:00
neterion	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
nuvoton	netdev: ethernet dev_alloc_skb to netdev_alloc_skb	2012-02-08 18:46:38 -05:00
nvidia	forcedeth: add transmit timestamping support	2012-04-30 21:33:27 -04:00
nxp	lpc_eth: fix tx completion	2012-06-11 13:12:33 -07:00
octeon	octeon: fix PHY name to match MDIO bus name	2012-02-13 16:04:09 -05:00
oki-semi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-05-16 22:17:37 -04:00
packetengines	yellowfin: stop using net_device.{base_addr, irq}.	2012-04-07 11:45:26 +02:00
pasemi	net/pasemi: fix compiler warning	2012-05-02 20:52:48 -04:00
qlogic	qlcnic: Fix protcol type in case of inband vlan.	2012-06-07 13:18:54 -07:00
racal	netdev: ethernet dev_alloc_skb to netdev_alloc_skb	2012-02-08 18:46:38 -05:00
rdc	r6040: Do a Proper deinit at errorpath and also when driver unloads (calling r6040_remove_one)	2012-05-29 22:31:08 -04:00
realtek	r8169: avoid NAPI scheduling delay.	2012-06-10 20:21:07 -07:00
renesas	net: sh_eth: fix the rxdesc pointer when rx descriptor empty happens	2012-05-29 17:30:08 -04:00
seeq	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
sfc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-05-16 22:17:37 -04:00
sgi	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
silan	sc92031: stop using net_device.{base_addr, irq}	2012-04-07 11:45:27 +02:00
sis	sis900: stop using net_device.{base_addr, irq} and convert to __iomem.	2012-04-07 11:47:18 +02:00
smsc	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
stmicro	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-12 21:59:18 -07:00
sun	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-06-12 21:59:18 -07:00
tehuti	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
ti	arm-soc: cleanups, part 2	2012-05-26 12:31:49 -07:00
tile	tilegx network driver: initial support	2012-06-11 17:01:26 -07:00
toshiba	drivers/net: Convert compare_ether_addr to ether_addr_equal	2012-05-10 23:33:01 -04:00
tundra	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
via	ethernet: Remove casts to same type	2012-06-06 09:31:33 -07:00
wiznet	net: WIZnet drivers: fix possible NULL dereference	2012-04-13 13:34:12 -04:00
xilinx	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-04-15 13:19:04 -04:00
xircom	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
xscale	net: remove ixp2000 ethernet driver	2012-04-04 18:09:37 -04:00
dnet.c	dnet: Support the get_ts_info ethtool method.	2012-04-04 05:28:46 -04:00
dnet.h
ethoc.c	ethoc: set addr_assign_type if random_ether_addr() used	2012-02-17 15:58:06 -05:00
fealnx.c	fealnx: Remove unused local label 'out' in netdev_open().	2012-04-07 09:02:32 -04:00
jme.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-02-26 21:55:51 -05:00
jme.h	jme: Fix FIFO flush issue	2012-02-22 14:44:41 -05:00
Kconfig	Ethernet driver for the WIZnet W5300 chip	2012-04-05 01:43:02 -04:00
korina.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
lantiq_etop.c	ethernet: Fix typo in lantiq_etop.c	2012-02-19 19:02:42 -05:00
Makefile	Ethernet driver for the WIZnet W5300 chip	2012-04-05 01:43:02 -04:00
mipsnet.c	net: replace random_ether_addr() with eth_hw_addr_random()	2012-02-15 15:34:16 -05:00
netx-eth.c	netdev: ethernet dev_alloc_skb to netdev_alloc_skb	2012-02-08 18:46:38 -05:00
s6gmac.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00