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path: root/drivers/net/usb/cdc_mbim.c
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Diffstat (limited to 'drivers/net/usb/cdc_mbim.c')
-rw-r--r--drivers/net/usb/cdc_mbim.c104
1 files changed, 82 insertions, 22 deletions
diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c
index 25ba7eca9a13..c9f3281506af 100644
--- a/drivers/net/usb/cdc_mbim.c
+++ b/drivers/net/usb/cdc_mbim.c
@@ -21,6 +21,8 @@
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc-wdm.h>
#include <linux/usb/cdc_ncm.h>
+#include <net/ipv6.h>
+#include <net/addrconf.h>
/* driver specific data - must match cdc_ncm usage */
struct cdc_mbim_state {
@@ -42,13 +44,11 @@ static int cdc_mbim_manage_power(struct usbnet *dev, int on)
if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
/* need autopm_get/put here to ensure the usbcore sees the new value */
rv = usb_autopm_get_interface(dev->intf);
- if (rv < 0)
- goto err;
dev->intf->needs_remote_wakeup = on;
- usb_autopm_put_interface(dev->intf);
+ if (!rv)
+ usb_autopm_put_interface(dev->intf);
}
-err:
- return rv;
+ return 0;
}
static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
@@ -173,7 +173,7 @@ static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb
}
spin_lock_bh(&ctx->mtx);
- skb_out = cdc_ncm_fill_tx_frame(ctx, skb, sign);
+ skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign);
spin_unlock_bh(&ctx->mtx);
return skb_out;
@@ -184,6 +184,60 @@ error:
return NULL;
}
+/* Some devices are known to send Neigbor Solicitation messages and
+ * require Neigbor Advertisement replies. The IPv6 core will not
+ * respond since IFF_NOARP is set, so we must handle them ourselves.
+ */
+static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
+{
+ struct ipv6hdr *iph = (void *)buf;
+ struct nd_msg *msg = (void *)(iph + 1);
+ struct net_device *netdev;
+ struct inet6_dev *in6_dev;
+ bool is_router;
+
+ /* we'll only respond to requests from unicast addresses to
+ * our solicited node addresses.
+ */
+ if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
+ !(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
+ return;
+
+ /* need to send the NA on the VLAN dev, if any */
+ if (tci)
+ netdev = __vlan_find_dev_deep(dev->net, htons(ETH_P_8021Q),
+ tci);
+ else
+ netdev = dev->net;
+ if (!netdev)
+ return;
+
+ in6_dev = in6_dev_get(netdev);
+ if (!in6_dev)
+ return;
+ is_router = !!in6_dev->cnf.forwarding;
+ in6_dev_put(in6_dev);
+
+ /* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
+ ipv6_stub->ndisc_send_na(netdev, NULL, &iph->saddr, &msg->target,
+ is_router /* router */,
+ true /* solicited */,
+ false /* override */,
+ true /* inc_opt */);
+}
+
+static bool is_neigh_solicit(u8 *buf, size_t len)
+{
+ struct ipv6hdr *iph = (void *)buf;
+ struct nd_msg *msg = (void *)(iph + 1);
+
+ return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
+ iph->nexthdr == IPPROTO_ICMPV6 &&
+ msg->icmph.icmp6_code == 0 &&
+ msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION);
+}
+
+
static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
{
__be16 proto = htons(ETH_P_802_3);
@@ -198,6 +252,8 @@ static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_
proto = htons(ETH_P_IP);
break;
case 0x60:
+ if (is_neigh_solicit(buf, len))
+ do_neigh_solicit(dev, buf, tci);
proto = htons(ETH_P_IPV6);
break;
default:
@@ -313,15 +369,13 @@ error:
static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
{
- int ret = 0;
+ int ret = -ENODEV;
struct usbnet *dev = usb_get_intfdata(intf);
struct cdc_mbim_state *info = (void *)&dev->data;
struct cdc_ncm_ctx *ctx = info->ctx;
- if (ctx == NULL) {
- ret = -1;
+ if (!ctx)
goto error;
- }
/*
* Both usbnet_suspend() and subdriver->suspend() MUST return 0
@@ -354,7 +408,7 @@ static int cdc_mbim_resume(struct usb_interface *intf)
if (ret < 0)
goto err;
ret = usbnet_resume(intf);
- if (ret < 0 && callsub && info->subdriver->suspend)
+ if (ret < 0 && callsub)
info->subdriver->suspend(intf, PMSG_SUSPEND);
err:
return ret;
@@ -371,9 +425,18 @@ static const struct driver_info cdc_mbim_info = {
};
/* MBIM and NCM devices should not need a ZLP after NTBs with
- * dwNtbOutMaxSize length. This driver_info is for the exceptional
- * devices requiring it anyway, allowing them to be supported without
- * forcing the performance penalty on all the sane devices.
+ * dwNtbOutMaxSize length. Nevertheless, a number of devices from
+ * different vendor IDs will fail unless we send ZLPs, forcing us
+ * to make this the default.
+ *
+ * This default may cause a performance penalty for spec conforming
+ * devices wanting to take advantage of optimizations possible without
+ * ZLPs. A whitelist is added in an attempt to avoid this for devices
+ * known to conform to the MBIM specification.
+ *
+ * All known devices supporting NCM compatibility mode are also
+ * conforming to the NCM and MBIM specifications. For this reason, the
+ * NCM subclass entry is also in the ZLP whitelist.
*/
static const struct driver_info cdc_mbim_info_zlp = {
.description = "CDC MBIM",
@@ -396,16 +459,13 @@ static const struct usb_device_id mbim_devs[] = {
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&cdc_mbim_info,
},
- /* Sierra Wireless MC7710 need ZLPs */
- { USB_DEVICE_AND_INTERFACE_INFO(0x1199, 0x68a2, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
- .driver_info = (unsigned long)&cdc_mbim_info_zlp,
- },
- /* HP hs2434 Mobile Broadband Module needs ZLPs */
- { USB_DEVICE_AND_INTERFACE_INFO(0x3f0, 0x4b1d, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
- .driver_info = (unsigned long)&cdc_mbim_info_zlp,
+ /* ZLP conformance whitelist: All Ericsson MBIM devices */
+ { USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
+ .driver_info = (unsigned long)&cdc_mbim_info,
},
+ /* default entry */
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
- .driver_info = (unsigned long)&cdc_mbim_info,
+ .driver_info = (unsigned long)&cdc_mbim_info_zlp,
},
{
},