| Message ID | 1611560015-20034-1-git-send-email-subashab@codeaurora.org |
|---|---|
| State | New |
| Headers | show |
| Series | [net-next,v2] net: qmi_wwan: Add pass through mode | expand |
Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> writes: > Pass through mode is to allow packets in MAP format to be passed > on to the stack. rmnet driver can be used to process and demultiplex > these packets. > > Pass through mode can be enabled when the device is in raw ip mode only. > Conversely, raw ip mode cannot be disabled when pass through mode is > enabled. > > Userspace can use pass through mode in conjunction with rmnet driver > through the following steps- > > 1. Enable raw ip mode on qmi_wwan device > 2. Enable pass through mode on qmi_wwan device > 3. Create a rmnet device with qmi_wwan device as real device using netlink > > Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Thanks! Looks good, and takes us at least one small step closer to a shared wwan userspace ABI Acked-by: Bjørn Mork <bjorn@mork.no>
On Mon, 2021-01-25 at 00:33 -0700, Subash Abhinov Kasiviswanathan wrote: > Pass through mode is to allow packets in MAP format to be passed > on to the stack. rmnet driver can be used to process and demultiplex > these packets. > > Pass through mode can be enabled when the device is in raw ip mode > only. > Conversely, raw ip mode cannot be disabled when pass through mode is > enabled. > > Userspace can use pass through mode in conjunction with rmnet driver > through the following steps- > > 1. Enable raw ip mode on qmi_wwan device > 2. Enable pass through mode on qmi_wwan device > 3. Create a rmnet device with qmi_wwan device as real device using > netlink This option is module-wide, right? eg, if there are multiple qmi_wwan-driven devices on the system, *all* of them must use MAP + passthrough, or none of them can, right? There are users that run 2+ devices on the same system, and different cards. I'm not sure I would assume that all can/would run in the same mode, unfortunately. Dan > Signed-off-by: Subash Abhinov Kasiviswanathan < > subashab@codeaurora.org> > --- > v1->v2: Update commit text and fix the following comments from Bjorn- > Remove locking as no netdev state change is requried since all the > configuration is already done in raw_ip_store. > Check the inverse relationship between raw_ip mode and pass_through > mode. > pass_through_mode just sets/resets the flag now. > raw_ip check is not needed when queueing pass_through mode packets as > that is enforced already during the mode configuration. > > drivers/net/usb/qmi_wwan.c | 58 > ++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 58 insertions(+) > > diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c > index 7ea113f5..e58a80a 100644 > --- a/drivers/net/usb/qmi_wwan.c > +++ b/drivers/net/usb/qmi_wwan.c > @@ -57,6 +57,7 @@ struct qmi_wwan_state { > enum qmi_wwan_flags { > QMI_WWAN_FLAG_RAWIP = 1 << 0, > QMI_WWAN_FLAG_MUX = 1 << 1, > + QMI_WWAN_FLAG_PASS_THROUGH = 1 << 2, > }; > > enum qmi_wwan_quirks { > @@ -326,6 +327,13 @@ static ssize_t raw_ip_store(struct device > *d, struct device_attribute *attr, co > if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP)) > return len; > > + /* ip mode cannot be cleared when pass through mode is set */ > + if (!enable && (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) { > + netdev_err(dev->net, > + "Cannot clear ip mode on pass through > device\n"); > + return -EINVAL; > + } > + > if (!rtnl_trylock()) > return restart_syscall(); > > @@ -456,14 +464,59 @@ static ssize_t del_mux_store(struct device > *d, struct device_attribute *attr, c > return ret; > } > > +static ssize_t pass_through_show(struct device *d, > + struct device_attribute *attr, char > *buf) > +{ > + struct usbnet *dev = netdev_priv(to_net_dev(d)); > + struct qmi_wwan_state *info; > + > + info = (void *)&dev->data; > + return sprintf(buf, "%c\n", > + info->flags & QMI_WWAN_FLAG_PASS_THROUGH ? 'Y' : > 'N'); > +} > + > +static ssize_t pass_through_store(struct device *d, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct usbnet *dev = netdev_priv(to_net_dev(d)); > + struct qmi_wwan_state *info; > + bool enable; > + > + if (strtobool(buf, &enable)) > + return -EINVAL; > + > + info = (void *)&dev->data; > + > + /* no change? */ > + if (enable == (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) > + return len; > + > + /* pass through mode can be set for raw ip devices only */ > + if (!(info->flags & QMI_WWAN_FLAG_RAWIP)) { > + netdev_err(dev->net, > + "Cannot set pass through mode on non ip > device\n"); > + return -EINVAL; > + } > + > + if (enable) > + info->flags |= QMI_WWAN_FLAG_PASS_THROUGH; > + else > + info->flags &= ~QMI_WWAN_FLAG_PASS_THROUGH; > + > + return len; > +} > + > static DEVICE_ATTR_RW(raw_ip); > static DEVICE_ATTR_RW(add_mux); > static DEVICE_ATTR_RW(del_mux); > +static DEVICE_ATTR_RW(pass_through); > > static struct attribute *qmi_wwan_sysfs_attrs[] = { > &dev_attr_raw_ip.attr, > &dev_attr_add_mux.attr, > &dev_attr_del_mux.attr, > + &dev_attr_pass_through.attr, > NULL, > }; > > @@ -510,6 +563,11 @@ static int qmi_wwan_rx_fixup(struct usbnet *dev, > struct sk_buff *skb) > if (info->flags & QMI_WWAN_FLAG_MUX) > return qmimux_rx_fixup(dev, skb); > > + if (info->flags & QMI_WWAN_FLAG_PASS_THROUGH) { > + skb->protocol = htons(ETH_P_MAP); > + return (netif_rx(skb) == NET_RX_SUCCESS); > + } > + > switch (skb->data[0] & 0xf0) { > case 0x40: > proto = htons(ETH_P_IP);
On Mon, 2021-01-25 at 17:00 +0100, Bjørn Mork wrote: > Dan Williams <dcbw@redhat.com> writes: > > On Mon, 2021-01-25 at 00:33 -0700, Subash Abhinov Kasiviswanathan > > wrote: > > > Pass through mode is to allow packets in MAP format to be passed > > > on to the stack. rmnet driver can be used to process and > > > demultiplex > > > these packets. > > > > > > Pass through mode can be enabled when the device is in raw ip > > > mode > > > only. > > > Conversely, raw ip mode cannot be disabled when pass through mode > > > is > > > enabled. > > > > > > Userspace can use pass through mode in conjunction with rmnet > > > driver > > > through the following steps- > > > > > > 1. Enable raw ip mode on qmi_wwan device > > > 2. Enable pass through mode on qmi_wwan device > > > 3. Create a rmnet device with qmi_wwan device as real device > > > using > > > netlink > > > > This option is module-wide, right? > > > > eg, if there are multiple qmi_wwan-driven devices on the system, > > *all* > > of them must use MAP + passthrough, or none of them can, right? > > No, this is a per-netdev setting, just like the raw-ip flag. Thanks for setting me straight. Glad to hear it. Dan
Hello: This patch was applied to netdev/net-next.git (refs/heads/master): On Mon, 25 Jan 2021 00:33:35 -0700 you wrote: > Pass through mode is to allow packets in MAP format to be passed > on to the stack. rmnet driver can be used to process and demultiplex > these packets. > > Pass through mode can be enabled when the device is in raw ip mode only. > Conversely, raw ip mode cannot be disabled when pass through mode is > enabled. > > [...] Here is the summary with links: - [net-next,v2] net: qmi_wwan: Add pass through mode https://git.kernel.org/netdev/net-next/c/59e139cf0b32 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index 7ea113f5..e58a80a 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -57,6 +57,7 @@ struct qmi_wwan_state { enum qmi_wwan_flags { QMI_WWAN_FLAG_RAWIP = 1 << 0, QMI_WWAN_FLAG_MUX = 1 << 1, + QMI_WWAN_FLAG_PASS_THROUGH = 1 << 2, }; enum qmi_wwan_quirks { @@ -326,6 +327,13 @@ static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, co if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP)) return len; + /* ip mode cannot be cleared when pass through mode is set */ + if (!enable && (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) { + netdev_err(dev->net, + "Cannot clear ip mode on pass through device\n"); + return -EINVAL; + } + if (!rtnl_trylock()) return restart_syscall(); @@ -456,14 +464,59 @@ static ssize_t del_mux_store(struct device *d, struct device_attribute *attr, c return ret; } +static ssize_t pass_through_show(struct device *d, + struct device_attribute *attr, char *buf) +{ + struct usbnet *dev = netdev_priv(to_net_dev(d)); + struct qmi_wwan_state *info; + + info = (void *)&dev->data; + return sprintf(buf, "%c\n", + info->flags & QMI_WWAN_FLAG_PASS_THROUGH ? 'Y' : 'N'); +} + +static ssize_t pass_through_store(struct device *d, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct usbnet *dev = netdev_priv(to_net_dev(d)); + struct qmi_wwan_state *info; + bool enable; + + if (strtobool(buf, &enable)) + return -EINVAL; + + info = (void *)&dev->data; + + /* no change? */ + if (enable == (info->flags & QMI_WWAN_FLAG_PASS_THROUGH)) + return len; + + /* pass through mode can be set for raw ip devices only */ + if (!(info->flags & QMI_WWAN_FLAG_RAWIP)) { + netdev_err(dev->net, + "Cannot set pass through mode on non ip device\n"); + return -EINVAL; + } + + if (enable) + info->flags |= QMI_WWAN_FLAG_PASS_THROUGH; + else + info->flags &= ~QMI_WWAN_FLAG_PASS_THROUGH; + + return len; +} + static DEVICE_ATTR_RW(raw_ip); static DEVICE_ATTR_RW(add_mux); static DEVICE_ATTR_RW(del_mux); +static DEVICE_ATTR_RW(pass_through); static struct attribute *qmi_wwan_sysfs_attrs[] = { &dev_attr_raw_ip.attr, &dev_attr_add_mux.attr, &dev_attr_del_mux.attr, + &dev_attr_pass_through.attr, NULL, }; @@ -510,6 +563,11 @@ static int qmi_wwan_rx_fixup(struct usbnet *dev, struct sk_buff *skb) if (info->flags & QMI_WWAN_FLAG_MUX) return qmimux_rx_fixup(dev, skb); + if (info->flags & QMI_WWAN_FLAG_PASS_THROUGH) { + skb->protocol = htons(ETH_P_MAP); + return (netif_rx(skb) == NET_RX_SUCCESS); + } + switch (skb->data[0] & 0xf0) { case 0x40: proto = htons(ETH_P_IP);
Pass through mode is to allow packets in MAP format to be passed on to the stack. rmnet driver can be used to process and demultiplex these packets. Pass through mode can be enabled when the device is in raw ip mode only. Conversely, raw ip mode cannot be disabled when pass through mode is enabled. Userspace can use pass through mode in conjunction with rmnet driver through the following steps- 1. Enable raw ip mode on qmi_wwan device 2. Enable pass through mode on qmi_wwan device 3. Create a rmnet device with qmi_wwan device as real device using netlink Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> --- v1->v2: Update commit text and fix the following comments from Bjorn- Remove locking as no netdev state change is requried since all the configuration is already done in raw_ip_store. Check the inverse relationship between raw_ip mode and pass_through mode. pass_through_mode just sets/resets the flag now. raw_ip check is not needed when queueing pass_through mode packets as that is enforced already during the mode configuration. drivers/net/usb/qmi_wwan.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+)