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-rw-r--r--drivers/net/mhi/Makefile2
-rw-r--r--drivers/net/mhi/mhi.h3
-rw-r--r--drivers/net/mhi/net.c7
-rw-r--r--drivers/net/mhi/proto_mbim.c293
4 files changed, 304 insertions, 1 deletions
diff --git a/drivers/net/mhi/Makefile b/drivers/net/mhi/Makefile
index 0acf989a5f95..f71b9f8f3c4f 100644
--- a/drivers/net/mhi/Makefile
+++ b/drivers/net/mhi/Makefile
@@ -1,3 +1,3 @@
obj-$(CONFIG_MHI_NET) += mhi_net.o
-mhi_net-y := net.o
+mhi_net-y := net.o proto_mbim.o
diff --git a/drivers/net/mhi/mhi.h b/drivers/net/mhi/mhi.h
index 82210e073000..12e7407d712a 100644
--- a/drivers/net/mhi/mhi.h
+++ b/drivers/net/mhi/mhi.h
@@ -28,6 +28,7 @@ struct mhi_net_dev {
struct delayed_work rx_refill;
struct mhi_net_stats stats;
u32 rx_queue_sz;
+ int msg_enable;
};
struct mhi_net_proto {
@@ -35,3 +36,5 @@ struct mhi_net_proto {
struct sk_buff * (*tx_fixup)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
void (*rx)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
};
+
+extern const struct mhi_net_proto proto_mbim;
diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
index 44cbfb39e557..f59960876083 100644
--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c
@@ -373,11 +373,18 @@ static const struct mhi_device_info mhi_swip0 = {
.netname = "mhi_swip%d",
};
+static const struct mhi_device_info mhi_hwip0_mbim = {
+ .netname = "mhi_mbim%d",
+ .proto = &proto_mbim,
+};
+
static const struct mhi_device_id mhi_net_id_table[] = {
/* Hardware accelerated data PATH (to modem IPA), protocol agnostic */
{ .chan = "IP_HW0", .driver_data = (kernel_ulong_t)&mhi_hwip0 },
/* Software data PATH (to modem CPU) */
{ .chan = "IP_SW0", .driver_data = (kernel_ulong_t)&mhi_swip0 },
+ /* Hardware accelerated data PATH (to modem IPA), MBIM protocol */
+ { .chan = "IP_HW0_MBIM", .driver_data = (kernel_ulong_t)&mhi_hwip0_mbim },
{}
};
MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);
diff --git a/drivers/net/mhi/proto_mbim.c b/drivers/net/mhi/proto_mbim.c
new file mode 100644
index 000000000000..75b5484c40d5
--- /dev/null
+++ b/drivers/net/mhi/proto_mbim.c
@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* MHI Network driver - Network over MHI bus
+ *
+ * Copyright (C) 2021 Linaro Ltd <loic.poulain@linaro.org>
+ *
+ * This driver copy some code from cdc_ncm, which is:
+ * Copyright (C) ST-Ericsson 2010-2012
+ * and cdc_mbim, which is:
+ * Copyright (c) 2012 Smith Micro Software, Inc.
+ * Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
+ *
+ */
+
+#include <linux/ethtool.h>
+#include <linux/if_vlan.h>
+#include <linux/ip.h>
+#include <linux/mii.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/usbnet.h>
+#include <linux/usb/cdc_ncm.h>
+
+#include "mhi.h"
+
+#define MBIM_NDP16_SIGN_MASK 0x00ffffff
+
+struct mbim_context {
+ u16 rx_seq;
+ u16 tx_seq;
+};
+
+static void __mbim_length_errors_inc(struct mhi_net_dev *dev)
+{
+ u64_stats_update_begin(&dev->stats.rx_syncp);
+ u64_stats_inc(&dev->stats.rx_length_errors);
+ u64_stats_update_end(&dev->stats.rx_syncp);
+}
+
+static void __mbim_errors_inc(struct mhi_net_dev *dev)
+{
+ u64_stats_update_begin(&dev->stats.rx_syncp);
+ u64_stats_inc(&dev->stats.rx_errors);
+ u64_stats_update_end(&dev->stats.rx_syncp);
+}
+
+static int mbim_rx_verify_nth16(struct sk_buff *skb)
+{
+ struct mhi_net_dev *dev = netdev_priv(skb->dev);
+ struct mbim_context *ctx = dev->proto_data;
+ struct usb_cdc_ncm_nth16 *nth16;
+ int len;
+
+ if (skb->len < sizeof(struct usb_cdc_ncm_nth16) +
+ sizeof(struct usb_cdc_ncm_ndp16)) {
+ netif_dbg(dev, rx_err, dev->ndev, "frame too short\n");
+ __mbim_length_errors_inc(dev);
+ return -EINVAL;
+ }
+
+ nth16 = (struct usb_cdc_ncm_nth16 *)skb->data;
+
+ if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
+ netif_dbg(dev, rx_err, dev->ndev,
+ "invalid NTH16 signature <%#010x>\n",
+ le32_to_cpu(nth16->dwSignature));
+ __mbim_errors_inc(dev);
+ return -EINVAL;
+ }
+
+ /* No limit on the block length, except the size of the data pkt */
+ len = le16_to_cpu(nth16->wBlockLength);
+ if (len > skb->len) {
+ netif_dbg(dev, rx_err, dev->ndev,
+ "NTB does not fit into the skb %u/%u\n", len,
+ skb->len);
+ __mbim_length_errors_inc(dev);
+ return -EINVAL;
+ }
+
+ if (ctx->rx_seq + 1 != le16_to_cpu(nth16->wSequence) &&
+ (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
+ !(ctx->rx_seq == 0xffff && !le16_to_cpu(nth16->wSequence))) {
+ netif_dbg(dev, rx_err, dev->ndev,
+ "sequence number glitch prev=%d curr=%d\n",
+ ctx->rx_seq, le16_to_cpu(nth16->wSequence));
+ }
+ ctx->rx_seq = le16_to_cpu(nth16->wSequence);
+
+ return le16_to_cpu(nth16->wNdpIndex);
+}
+
+static int mbim_rx_verify_ndp16(struct sk_buff *skb, int ndpoffset)
+{
+ struct mhi_net_dev *dev = netdev_priv(skb->dev);
+ struct usb_cdc_ncm_ndp16 *ndp16;
+ int ret;
+
+ if (ndpoffset + sizeof(struct usb_cdc_ncm_ndp16) > skb->len) {
+ netif_dbg(dev, rx_err, dev->ndev, "invalid NDP offset <%u>\n",
+ ndpoffset);
+ return -EINVAL;
+ }
+
+ ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
+
+ if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
+ netif_dbg(dev, rx_err, dev->ndev, "invalid DPT16 length <%u>\n",
+ le16_to_cpu(ndp16->wLength));
+ return -EINVAL;
+ }
+
+ ret = ((le16_to_cpu(ndp16->wLength) - sizeof(struct usb_cdc_ncm_ndp16))
+ / sizeof(struct usb_cdc_ncm_dpe16));
+ ret--; /* Last entry is always a NULL terminator */
+
+ if (sizeof(struct usb_cdc_ncm_ndp16) +
+ ret * sizeof(struct usb_cdc_ncm_dpe16) > skb->len) {
+ netif_dbg(dev, rx_err, dev->ndev,
+ "Invalid nframes = %d\n", ret);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static void mbim_rx(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb)
+{
+ struct net_device *ndev = mhi_netdev->ndev;
+ int ndpoffset;
+
+ if (skb_linearize(skb))
+ goto error;
+
+ /* Check NTB header and retrieve first NDP offset */
+ ndpoffset = mbim_rx_verify_nth16(skb);
+ if (ndpoffset < 0) {
+ net_err_ratelimited("%s: Incorrect NTB header\n", ndev->name);
+ goto error;
+ }
+
+ /* Process each NDP */
+ while (1) {
+ struct usb_cdc_ncm_ndp16 *ndp16;
+ struct usb_cdc_ncm_dpe16 *dpe16;
+ int nframes, n;
+
+ /* Check NDP header and retrieve number of datagrams */
+ nframes = mbim_rx_verify_ndp16(skb, ndpoffset);
+ if (nframes < 0) {
+ net_err_ratelimited("%s: Incorrect NDP16\n", ndev->name);
+ __mbim_length_errors_inc(mhi_netdev);
+ goto error;
+ }
+
+ /* Only IP data type supported, no DSS in MHI context */
+ ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
+ if ((ndp16->dwSignature & cpu_to_le32(MBIM_NDP16_SIGN_MASK))
+ != cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN)) {
+ net_err_ratelimited("%s: Unsupported NDP type\n", ndev->name);
+ __mbim_errors_inc(mhi_netdev);
+ goto next_ndp;
+ }
+
+ /* Only primary IP session 0 (0x00) supported for now */
+ if (ndp16->dwSignature & ~cpu_to_le32(MBIM_NDP16_SIGN_MASK)) {
+ net_err_ratelimited("%s: bad packet session\n", ndev->name);
+ __mbim_errors_inc(mhi_netdev);
+ goto next_ndp;
+ }
+
+ /* de-aggregate and deliver IP packets */
+ dpe16 = ndp16->dpe16;
+ for (n = 0; n < nframes; n++, dpe16++) {
+ u16 dgram_offset = le16_to_cpu(dpe16->wDatagramIndex);
+ u16 dgram_len = le16_to_cpu(dpe16->wDatagramLength);
+ struct sk_buff *skbn;
+
+ if (!dgram_offset || !dgram_len)
+ break; /* null terminator */
+
+ skbn = netdev_alloc_skb(ndev, dgram_len);
+ if (!skbn)
+ continue;
+
+ skb_put(skbn, dgram_len);
+ memcpy(skbn->data, skb->data + dgram_offset, dgram_len);
+
+ switch (skbn->data[0] & 0xf0) {
+ case 0x40:
+ skbn->protocol = htons(ETH_P_IP);
+ break;
+ case 0x60:
+ skbn->protocol = htons(ETH_P_IPV6);
+ break;
+ default:
+ net_err_ratelimited("%s: unknown protocol\n",
+ ndev->name);
+ __mbim_errors_inc(mhi_netdev);
+ dev_kfree_skb_any(skbn);
+ continue;
+ }
+
+ netif_rx(skbn);
+ }
+next_ndp:
+ /* Other NDP to process? */
+ ndpoffset = (int)le16_to_cpu(ndp16->wNextNdpIndex);
+ if (!ndpoffset)
+ break;
+ }
+
+ /* free skb */
+ dev_consume_skb_any(skb);
+ return;
+error:
+ dev_kfree_skb_any(skb);
+}
+
+struct mbim_tx_hdr {
+ struct usb_cdc_ncm_nth16 nth16;
+ struct usb_cdc_ncm_ndp16 ndp16;
+ struct usb_cdc_ncm_dpe16 dpe16[2];
+} __packed;
+
+static struct sk_buff *mbim_tx_fixup(struct mhi_net_dev *mhi_netdev,
+ struct sk_buff *skb)
+{
+ struct mbim_context *ctx = mhi_netdev->proto_data;
+ unsigned int dgram_size = skb->len;
+ struct usb_cdc_ncm_nth16 *nth16;
+ struct usb_cdc_ncm_ndp16 *ndp16;
+ struct mbim_tx_hdr *mbim_hdr;
+
+ /* For now, this is a partial implementation of CDC MBIM, only one NDP
+ * is sent, containing the IP packet (no aggregation).
+ */
+
+ /* Ensure we have enough headroom for crafting MBIM header */
+ if (skb_cow_head(skb, sizeof(struct mbim_tx_hdr))) {
+ dev_kfree_skb_any(skb);
+ return NULL;
+ }
+
+ mbim_hdr = skb_push(skb, sizeof(struct mbim_tx_hdr));
+
+ /* Fill NTB header */
+ nth16 = &mbim_hdr->nth16;
+ nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
+ nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
+ nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
+ nth16->wBlockLength = cpu_to_le16(skb->len);
+ nth16->wNdpIndex = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
+
+ /* Fill the unique NDP */
+ ndp16 = &mbim_hdr->ndp16;
+ ndp16->dwSignature = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
+ ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16)
+ + sizeof(struct usb_cdc_ncm_dpe16) * 2);
+ ndp16->wNextNdpIndex = 0;
+
+ /* Datagram follows the mbim header */
+ ndp16->dpe16[0].wDatagramIndex = cpu_to_le16(sizeof(struct mbim_tx_hdr));
+ ndp16->dpe16[0].wDatagramLength = cpu_to_le16(dgram_size);
+
+ /* null termination */
+ ndp16->dpe16[1].wDatagramIndex = 0;
+ ndp16->dpe16[1].wDatagramLength = 0;
+
+ return skb;
+}
+
+static int mbim_init(struct mhi_net_dev *mhi_netdev)
+{
+ struct net_device *ndev = mhi_netdev->ndev;
+
+ mhi_netdev->proto_data = devm_kzalloc(&ndev->dev,
+ sizeof(struct mbim_context),
+ GFP_KERNEL);
+ if (!mhi_netdev->proto_data)
+ return -ENOMEM;
+
+ ndev->needed_headroom = sizeof(struct mbim_tx_hdr);
+
+ return 0;
+}
+
+const struct mhi_net_proto proto_mbim = {
+ .init = mbim_init,
+ .rx = mbim_rx,
+ .tx_fixup = mbim_tx_fixup,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-28 17:01:36 +0000