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Date: Fri, 10 Jun 2011 17:06:58 +0200 From: Richard Cochran <richardcochran@...il.com> To: <netdev@...r.kernel.org> Cc: David Miller <davem@...emloft.net> Subject: [PATCH 00/10] net: expand time stamping, batch #1 This patch series represents the start of an effort to get better coverage of the SO_TIMESTAMPING socket API in the Ethernet drivers. Adding time stamping support to a given driver solves two separate issues, namely software transmit time stamping and hardware time stamping in PHY devices. The SO_TIMESTAMPING socket API has been around since 2.6.30, but it turned out that getting software transmit time stamps could not be done in one central place in the stack. Instead, a work around was introduced whereby each MAC driver must call a skb_tx_timestamp() hook in order to support SW Tx time stamps. Full PTP Hardware Clock (PHC) support has been merged for Linux 3.0, including a driver for a PHY that does HW stamping. In the receive path, the PHY based time stamping is handled by the stack for NAPI based MAC drivers. But for transmit time stamps, support is needed in the Ethernet MAC driver by calling the skb_tx_timestamp() hook. For non-NAPI drivers, PHY based receive time stamping is currently not possible. This patch series adds yet another hook (a wrapper around netif_rx) for such drivers. The first two patches make minor changes in the stack in support of MAC/PHY time stamping. The next three patches enable PHY time stamping for two MACs which have been paired with a PHC PHY on real life boards. The remaining patches are for MACs that I chose because they (1) use phylib and (2) compile for x86. However, I only compiled these, not tested, since I do not have the hardware. The larger goal is to eventually get the skb_tx_timestamp hook into each and every Ethernet MAC driver, so that SO_TIMESTAMPING using SW time stamps will be supported across the board. I have started by picking those drivers in which adding the hook will bring the greatest benefit, namely those using phylib, since adding hooks provides both SW and PHY HW time stamping. If people approve of this effort, I will follow with another patch series adding SW Tx time stamping to yet more MACs. Adding SW Tx support is just a single line, but still, perhaps compile testing only is too risky. I would appreciate feedback on this issue. Richard Cochran (10): net: introduce time stamping wrapper for netif_rx. fec: enable transmit and receive time stamping. davinci_emac: pass ioctls through to phy device. davinci_emac: enable transmit time stamping. tg3: enable transmit time stamping. dnet: enable transmit time stamping. ethoc: enable transmit time stamping. r6040: enable transmit time stamping. stmmac: enable transmit time stamping. smsc9420: enable transmit time stamping. drivers/net/davinci_emac.c | 5 +++-- drivers/net/dnet.c | 2 ++ drivers/net/ethoc.c | 1 + drivers/net/fec.c | 4 +++- drivers/net/r6040.c | 2 ++ drivers/net/smsc9420.c | 2 ++ drivers/net/stmmac/stmmac_main.c | 2 ++ drivers/net/tg3.c | 2 ++ include/linux/netdevice.h | 21 +++++++++++++++++++++ 9 files changed, 38 insertions(+), 3 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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