| Message ID | 20180604070837.19265-10-yangbo.lu@nxp.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Support DPAA PTP clock and timestamping | expand |
On Mon, Jun 04, 2018 at 03:08:36PM +0800, Yangbo Lu wrote: > +if FSL_DPAA_ETH > +config FSL_DPAA_ETH_TS > + bool "DPAA hardware timestamping support" > + select PTP_1588_CLOCK_QORIQ > + default n > + help > + Enable DPAA hardware timestamping support. > + This option is useful for applications to get > + hardware time stamps on the Ethernet packets > + using the SO_TIMESTAMPING API. > +endif You should drop this #ifdef. In general, if a MAC supports time stamping and PHC, then the driver support should simply be compiled in. [ When time stamping incurs a large run time performance penalty to non-PTP users, then it might make sense to have a Kconfig option to disable it, but that doesn't appear to be the case here. ] > @@ -1615,6 +1635,24 @@ static int dpaa_eth_refill_bpools(struct dpaa_priv *priv) > skbh = (struct sk_buff **)phys_to_virt(addr); > skb = *skbh; > > +#ifdef CONFIG_FSL_DPAA_ETH_TS > + if (priv->tx_tstamp && > + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { This condition fits on one line easily. > + struct skb_shared_hwtstamps shhwtstamps; > + u64 ns; Local variables belong at the top of the function. > + memset(&shhwtstamps, 0, sizeof(shhwtstamps)); > + > + if (!dpaa_get_tstamp_ns(priv->net_dev, &ns, > + priv->mac_dev->port[TX], > + (void *)skbh)) { > + shhwtstamps.hwtstamp = ns_to_ktime(ns); > + skb_tstamp_tx(skb, &shhwtstamps); > + } else { > + dev_warn(dev, "dpaa_get_tstamp_ns failed!\n"); > + } > + } > +#endif > if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) { > nr_frags = skb_shinfo(skb)->nr_frags; > dma_unmap_single(dev, addr, qm_fd_get_offset(fd) + > @@ -2086,6 +2124,14 @@ static int dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev) > if (unlikely(err < 0)) > goto skb_to_fd_failed; > > +#ifdef CONFIG_FSL_DPAA_ETH_TS > + if (priv->tx_tstamp && > + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { One line please. > + fd.cmd |= FM_FD_CMD_UPD; > + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; > + } > +#endif > + > if (likely(dpaa_xmit(priv, percpu_stats, queue_mapping, &fd) == 0)) > return NETDEV_TX_OK; > Thanks, Richard
Hi Richard, > -----Original Message----- > From: Richard Cochran [mailto:richardcochran@gmail.com] > Sent: Monday, June 4, 2018 9:49 PM > To: Y.b. Lu <yangbo.lu@nxp.com> > Cc: netdev@vger.kernel.org; Madalin-cristian Bucur > <madalin.bucur@nxp.com>; Rob Herring <robh+dt@kernel.org>; Shawn Guo > <shawnguo@kernel.org>; David S . Miller <davem@davemloft.net>; > devicetree@vger.kernel.org; linuxppc-dev@lists.ozlabs.org; > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH 09/10] dpaa_eth: add support for hardware timestamping > > On Mon, Jun 04, 2018 at 03:08:36PM +0800, Yangbo Lu wrote: > > > +if FSL_DPAA_ETH > > +config FSL_DPAA_ETH_TS > > + bool "DPAA hardware timestamping support" > > + select PTP_1588_CLOCK_QORIQ > > + default n > > + help > > + Enable DPAA hardware timestamping support. > > + This option is useful for applications to get > > + hardware time stamps on the Ethernet packets > > + using the SO_TIMESTAMPING API. > > +endif > > You should drop this #ifdef. In general, if a MAC supports time stamping and > PHC, then the driver support should simply be compiled in. > > [ When time stamping incurs a large run time performance penalty to > non-PTP users, then it might make sense to have a Kconfig option to > disable it, but that doesn't appear to be the case here. ] [Y.b. Lu] Actually these timestamping codes affected DPAA networking performance in our previous performance test. That's why we used ifdef for it. > > > @@ -1615,6 +1635,24 @@ static int dpaa_eth_refill_bpools(struct > dpaa_priv *priv) > > skbh = (struct sk_buff **)phys_to_virt(addr); > > skb = *skbh; > > > > +#ifdef CONFIG_FSL_DPAA_ETH_TS > > + if (priv->tx_tstamp && > > + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { > > This condition fits on one line easily. [Y.b. Lu] Right. I will use one line in next version. > > > + struct skb_shared_hwtstamps shhwtstamps; > > + u64 ns; > > Local variables belong at the top of the function. [Y.b. Lu] Ok, will move them to the top in next verison. > > > + memset(&shhwtstamps, 0, sizeof(shhwtstamps)); > > + > > + if (!dpaa_get_tstamp_ns(priv->net_dev, &ns, > > + priv->mac_dev->port[TX], > > + (void *)skbh)) { > > + shhwtstamps.hwtstamp = ns_to_ktime(ns); > > + skb_tstamp_tx(skb, &shhwtstamps); > > + } else { > > + dev_warn(dev, "dpaa_get_tstamp_ns failed!\n"); > > + } > > + } > > +#endif > > if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) { > > nr_frags = skb_shinfo(skb)->nr_frags; > > dma_unmap_single(dev, addr, qm_fd_get_offset(fd) + @@ -2086,6 > > +2124,14 @@ static int dpaa_start_xmit(struct sk_buff *skb, struct > net_device *net_dev) > > if (unlikely(err < 0)) > > goto skb_to_fd_failed; > > > > +#ifdef CONFIG_FSL_DPAA_ETH_TS > > + if (priv->tx_tstamp && > > + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { > > One line please. [Y.b. Lu] No problem. > > > + fd.cmd |= FM_FD_CMD_UPD; > > + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; > > + } > > +#endif > > + > > if (likely(dpaa_xmit(priv, percpu_stats, queue_mapping, &fd) == 0)) > > return NETDEV_TX_OK; > > > > Thanks, > Richard
On Tue, Jun 05, 2018 at 03:35:28AM +0000, Y.b. Lu wrote: > [Y.b. Lu] Actually these timestamping codes affected DPAA networking performance in our previous performance test. > That's why we used ifdef for it. How much does time stamping hurt performance? If the time stamping is compiled in but not enabled at run time, does it still affect performace? Thanks, Richard
Hi Richard, > -----Original Message----- > From: Richard Cochran [mailto:richardcochran@gmail.com] > Sent: Tuesday, June 5, 2018 9:58 PM > To: Y.b. Lu <yangbo.lu@nxp.com> > Cc: netdev@vger.kernel.org; Madalin-cristian Bucur > <madalin.bucur@nxp.com>; Rob Herring <robh+dt@kernel.org>; Shawn Guo > <shawnguo@kernel.org>; David S . Miller <davem@davemloft.net>; > devicetree@vger.kernel.org; linuxppc-dev@lists.ozlabs.org; > linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH 09/10] dpaa_eth: add support for hardware timestamping > > On Tue, Jun 05, 2018 at 03:35:28AM +0000, Y.b. Lu wrote: > > [Y.b. Lu] Actually these timestamping codes affected DPAA networking > performance in our previous performance test. > > That's why we used ifdef for it. > > How much does time stamping hurt performance? > > If the time stamping is compiled in but not enabled at run time, does it still > affect performace? [Y.b. Lu] I can't remember and find the old data since it had been a long time. I just did the iperf test today between two 10G ports. I didn’t see any performance changes with timestamping code 😊 So, let's me remove the ifdef in next version. Thanks a lot. > > Thanks, > Richard
diff --git a/drivers/net/ethernet/freescale/dpaa/Kconfig b/drivers/net/ethernet/freescale/dpaa/Kconfig index a654736..da34138 100644 --- a/drivers/net/ethernet/freescale/dpaa/Kconfig +++ b/drivers/net/ethernet/freescale/dpaa/Kconfig @@ -8,3 +8,15 @@ menuconfig FSL_DPAA_ETH supporting the Freescale QorIQ chips. Depends on Freescale Buffer Manager and Queue Manager driver and Frame Manager Driver. + +if FSL_DPAA_ETH +config FSL_DPAA_ETH_TS + bool "DPAA hardware timestamping support" + select PTP_1588_CLOCK_QORIQ + default n + help + Enable DPAA hardware timestamping support. + This option is useful for applications to get + hardware time stamps on the Ethernet packets + using the SO_TIMESTAMPING API. +endif diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c index fd43f98..864cfb0 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c @@ -1168,7 +1168,11 @@ static int dpaa_eth_init_tx_port(struct fman_port *port, struct dpaa_fq *errq, buf_prefix_content.priv_data_size = buf_layout->priv_data_size; buf_prefix_content.pass_prs_result = true; buf_prefix_content.pass_hash_result = true; +#ifdef CONFIG_FSL_DPAA_ETH_TS + buf_prefix_content.pass_time_stamp = true; +#else buf_prefix_content.pass_time_stamp = false; +#endif buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT; params.specific_params.non_rx_params.err_fqid = errq->fqid; @@ -1210,7 +1214,11 @@ static int dpaa_eth_init_rx_port(struct fman_port *port, struct dpaa_bp **bps, buf_prefix_content.priv_data_size = buf_layout->priv_data_size; buf_prefix_content.pass_prs_result = true; buf_prefix_content.pass_hash_result = true; +#ifdef CONFIG_FSL_DPAA_ETH_TS + buf_prefix_content.pass_time_stamp = true; +#else buf_prefix_content.pass_time_stamp = false; +#endif buf_prefix_content.data_align = DPAA_FD_DATA_ALIGNMENT; rx_p = ¶ms.specific_params.rx_params; @@ -1592,6 +1600,18 @@ static int dpaa_eth_refill_bpools(struct dpaa_priv *priv) return 0; } +#ifdef CONFIG_FSL_DPAA_ETH_TS +static int dpaa_get_tstamp_ns(struct net_device *net_dev, u64 *ns, + struct fman_port *port, const void *data) +{ + if (!fman_port_get_tstamp_field(port, data, ns)) { + be64_to_cpus(ns); + return 0; + } + return -EINVAL; +} +#endif + /* Cleanup function for outgoing frame descriptors that were built on Tx path, * either contiguous frames or scatter/gather ones. * Skb freeing is not handled here. @@ -1615,6 +1635,24 @@ static int dpaa_eth_refill_bpools(struct dpaa_priv *priv) skbh = (struct sk_buff **)phys_to_virt(addr); skb = *skbh; +#ifdef CONFIG_FSL_DPAA_ETH_TS + if (priv->tx_tstamp && + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { + struct skb_shared_hwtstamps shhwtstamps; + u64 ns; + + memset(&shhwtstamps, 0, sizeof(shhwtstamps)); + + if (!dpaa_get_tstamp_ns(priv->net_dev, &ns, + priv->mac_dev->port[TX], + (void *)skbh)) { + shhwtstamps.hwtstamp = ns_to_ktime(ns); + skb_tstamp_tx(skb, &shhwtstamps); + } else { + dev_warn(dev, "dpaa_get_tstamp_ns failed!\n"); + } + } +#endif if (unlikely(qm_fd_get_format(fd) == qm_fd_sg)) { nr_frags = skb_shinfo(skb)->nr_frags; dma_unmap_single(dev, addr, qm_fd_get_offset(fd) + @@ -2086,6 +2124,14 @@ static int dpaa_start_xmit(struct sk_buff *skb, struct net_device *net_dev) if (unlikely(err < 0)) goto skb_to_fd_failed; +#ifdef CONFIG_FSL_DPAA_ETH_TS + if (priv->tx_tstamp && + skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) { + fd.cmd |= FM_FD_CMD_UPD; + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; + } +#endif + if (likely(dpaa_xmit(priv, percpu_stats, queue_mapping, &fd) == 0)) return NETDEV_TX_OK; @@ -2304,6 +2350,23 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal, if (!skb) return qman_cb_dqrr_consume; +#ifdef CONFIG_FSL_DPAA_ETH_TS + if (priv->rx_tstamp) { + struct skb_shared_hwtstamps *shhwtstamps; + u64 ns; + + shhwtstamps = skb_hwtstamps(skb); + memset(shhwtstamps, 0, sizeof(*shhwtstamps)); + + if (!dpaa_get_tstamp_ns(priv->net_dev, &ns, + priv->mac_dev->port[RX], + vaddr)) + shhwtstamps->hwtstamp = ns_to_ktime(ns); + else + dev_warn(net_dev->dev.parent, "dpaa_get_tstamp_ns failed!\n"); + } +#endif + skb->protocol = eth_type_trans(skb, net_dev); if (net_dev->features & NETIF_F_RXHASH && priv->keygen_in_use && @@ -2523,11 +2586,61 @@ static int dpaa_eth_stop(struct net_device *net_dev) return err; } +#ifdef CONFIG_FSL_DPAA_ETH_TS +static int dpaa_ts_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct dpaa_priv *priv = netdev_priv(dev); + struct hwtstamp_config config; + + if (copy_from_user(&config, rq->ifr_data, sizeof(config))) + return -EFAULT; + + switch (config.tx_type) { + case HWTSTAMP_TX_OFF: + /* Couldn't disable rx/tx timestamping separately. + * Do nothing here. + */ + priv->tx_tstamp = false; + break; + case HWTSTAMP_TX_ON: + priv->mac_dev->set_tstamp(priv->mac_dev->fman_mac, true); + priv->tx_tstamp = true; + break; + default: + return -ERANGE; + } + + if (config.rx_filter == HWTSTAMP_FILTER_NONE) { + /* Couldn't disable rx/tx timestamping separately. + * Do nothing here. + */ + priv->rx_tstamp = false; + } else { + priv->mac_dev->set_tstamp(priv->mac_dev->fman_mac, true); + priv->rx_tstamp = true; + /* TS is set for all frame types, not only those requested */ + config.rx_filter = HWTSTAMP_FILTER_ALL; + } + + return copy_to_user(rq->ifr_data, &config, sizeof(config)) ? + -EFAULT : 0; +} +#endif /* CONFIG_FSL_DPAA_ETH_TS */ + static int dpaa_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd) { - if (!net_dev->phydev) - return -EINVAL; - return phy_mii_ioctl(net_dev->phydev, rq, cmd); + int ret = -EINVAL; + + if (cmd == SIOCGMIIREG) { + if (net_dev->phydev) + return phy_mii_ioctl(net_dev->phydev, rq, cmd); + } + +#ifdef CONFIG_FSL_DPAA_ETH_TS + if (cmd == SIOCSHWTSTAMP) + return dpaa_ts_ioctl(net_dev, rq, cmd); +#endif + return ret; } static const struct net_device_ops dpaa_ops = { diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h index bd94220..e8214fc 100644 --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.h @@ -182,6 +182,11 @@ struct dpaa_priv { struct dpaa_buffer_layout buf_layout[2]; u16 rx_headroom; + +#ifdef CONFIG_FSL_DPAA_ETH_TS + bool tx_tstamp; /* Tx timestamping enabled */ + bool rx_tstamp; /* Rx timestamping enabled */ +#endif }; /* from dpaa_ethtool.c */
This patch is to add hardware timestamping support for dpaa_eth. On Rx, timestamping is enabled for all frames. On Tx, we only instruct the hardware to timestamp the frames marked accordingly by the stack. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> --- drivers/net/ethernet/freescale/dpaa/Kconfig | 12 +++ drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 119 +++++++++++++++++++++++- drivers/net/ethernet/freescale/dpaa/dpaa_eth.h | 5 + 3 files changed, 133 insertions(+), 3 deletions(-)