Merge branch 'Add-MBIM-over-MHI-support'
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
commit
d816f2a9cb
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@ -36,7 +36,7 @@ obj-$(CONFIG_GTP) += gtp.o
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obj-$(CONFIG_NLMON) += nlmon.o
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obj-$(CONFIG_NET_VRF) += vrf.o
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obj-$(CONFIG_VSOCKMON) += vsockmon.o
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obj-$(CONFIG_MHI_NET) += mhi_net.o
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obj-$(CONFIG_MHI_NET) += mhi/
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#
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# Networking Drivers
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|
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3
drivers/net/mhi/Makefile
Normal file
3
drivers/net/mhi/Makefile
Normal file
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@ -0,0 +1,3 @@
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obj-$(CONFIG_MHI_NET) += mhi_net.o
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mhi_net-y := net.o proto_mbim.o
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40
drivers/net/mhi/mhi.h
Normal file
40
drivers/net/mhi/mhi.h
Normal file
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@ -0,0 +1,40 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* MHI Network driver - Network over MHI bus
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*
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* Copyright (C) 2021 Linaro Ltd <loic.poulain@linaro.org>
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*/
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struct mhi_net_stats {
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u64_stats_t rx_packets;
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u64_stats_t rx_bytes;
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u64_stats_t rx_errors;
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u64_stats_t rx_dropped;
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u64_stats_t rx_length_errors;
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u64_stats_t tx_packets;
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u64_stats_t tx_bytes;
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u64_stats_t tx_errors;
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u64_stats_t tx_dropped;
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struct u64_stats_sync tx_syncp;
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struct u64_stats_sync rx_syncp;
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};
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struct mhi_net_dev {
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struct mhi_device *mdev;
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struct net_device *ndev;
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struct sk_buff *skbagg_head;
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struct sk_buff *skbagg_tail;
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const struct mhi_net_proto *proto;
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void *proto_data;
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struct delayed_work rx_refill;
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struct mhi_net_stats stats;
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u32 rx_queue_sz;
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int msg_enable;
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};
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struct mhi_net_proto {
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int (*init)(struct mhi_net_dev *mhi_netdev);
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struct sk_buff * (*tx_fixup)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
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void (*rx)(struct mhi_net_dev *mhi_netdev, struct sk_buff *skb);
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};
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extern const struct mhi_net_proto proto_mbim;
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@ -12,31 +12,15 @@
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#include <linux/skbuff.h>
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#include <linux/u64_stats_sync.h>
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#include "mhi.h"
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#define MHI_NET_MIN_MTU ETH_MIN_MTU
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#define MHI_NET_MAX_MTU 0xffff
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#define MHI_NET_DEFAULT_MTU 0x4000
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struct mhi_net_stats {
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u64_stats_t rx_packets;
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u64_stats_t rx_bytes;
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u64_stats_t rx_errors;
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u64_stats_t rx_dropped;
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u64_stats_t tx_packets;
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u64_stats_t tx_bytes;
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u64_stats_t tx_errors;
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u64_stats_t tx_dropped;
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struct u64_stats_sync tx_syncp;
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struct u64_stats_sync rx_syncp;
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};
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struct mhi_net_dev {
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struct mhi_device *mdev;
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struct net_device *ndev;
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struct sk_buff *skbagg_head;
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struct sk_buff *skbagg_tail;
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struct delayed_work rx_refill;
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struct mhi_net_stats stats;
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u32 rx_queue_sz;
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struct mhi_device_info {
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const char *netname;
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const struct mhi_net_proto *proto;
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};
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static int mhi_ndo_open(struct net_device *ndev)
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@ -68,26 +52,35 @@ static int mhi_ndo_stop(struct net_device *ndev)
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static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev)
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{
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struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
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const struct mhi_net_proto *proto = mhi_netdev->proto;
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struct mhi_device *mdev = mhi_netdev->mdev;
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int err;
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if (proto && proto->tx_fixup) {
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skb = proto->tx_fixup(mhi_netdev, skb);
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if (unlikely(!skb))
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goto exit_drop;
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}
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err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT);
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if (unlikely(err)) {
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net_err_ratelimited("%s: Failed to queue TX buf (%d)\n",
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ndev->name, err);
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u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
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u64_stats_inc(&mhi_netdev->stats.tx_dropped);
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u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
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/* drop the packet */
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dev_kfree_skb_any(skb);
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goto exit_drop;
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}
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if (mhi_queue_is_full(mdev, DMA_TO_DEVICE))
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netif_stop_queue(ndev);
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return NETDEV_TX_OK;
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exit_drop:
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u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
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u64_stats_inc(&mhi_netdev->stats.tx_dropped);
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u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
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return NETDEV_TX_OK;
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}
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static void mhi_ndo_get_stats64(struct net_device *ndev,
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@ -102,6 +95,7 @@ static void mhi_ndo_get_stats64(struct net_device *ndev,
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stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes);
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stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors);
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stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped);
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stats->rx_length_errors = u64_stats_read(&mhi_netdev->stats.rx_length_errors);
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} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start));
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do {
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@ -164,6 +158,7 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
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struct mhi_result *mhi_res)
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{
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struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
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const struct mhi_net_proto *proto = mhi_netdev->proto;
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struct sk_buff *skb = mhi_res->buf_addr;
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int free_desc_count;
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@ -220,7 +215,10 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
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break;
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}
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netif_rx(skb);
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if (proto && proto->rx)
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proto->rx(mhi_netdev, skb);
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else
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netif_rx(skb);
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}
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/* Refill if RX buffers queue becomes low */
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@ -302,14 +300,14 @@ static struct device_type wwan_type = {
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static int mhi_net_probe(struct mhi_device *mhi_dev,
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const struct mhi_device_id *id)
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{
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const char *netname = (char *)id->driver_data;
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const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data;
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struct device *dev = &mhi_dev->dev;
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struct mhi_net_dev *mhi_netdev;
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struct net_device *ndev;
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int err;
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ndev = alloc_netdev(sizeof(*mhi_netdev), netname, NET_NAME_PREDICTABLE,
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mhi_net_setup);
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ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname,
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NET_NAME_PREDICTABLE, mhi_net_setup);
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if (!ndev)
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return -ENOMEM;
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@ -318,6 +316,7 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
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mhi_netdev->ndev = ndev;
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mhi_netdev->mdev = mhi_dev;
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mhi_netdev->skbagg_head = NULL;
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mhi_netdev->proto = info->proto;
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SET_NETDEV_DEV(ndev, &mhi_dev->dev);
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SET_NETDEV_DEVTYPE(ndev, &wwan_type);
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@ -337,8 +336,16 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
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if (err)
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goto out_err;
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if (mhi_netdev->proto) {
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err = mhi_netdev->proto->init(mhi_netdev);
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if (err)
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goto out_err_proto;
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}
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return 0;
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out_err_proto:
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unregister_netdev(ndev);
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out_err:
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free_netdev(ndev);
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return err;
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@ -358,9 +365,26 @@ static void mhi_net_remove(struct mhi_device *mhi_dev)
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free_netdev(mhi_netdev->ndev);
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}
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static const struct mhi_device_info mhi_hwip0 = {
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.netname = "mhi_hwip%d",
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};
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static const struct mhi_device_info mhi_swip0 = {
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.netname = "mhi_swip%d",
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};
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static const struct mhi_device_info mhi_hwip0_mbim = {
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.netname = "mhi_mbim%d",
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.proto = &proto_mbim,
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};
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static const struct mhi_device_id mhi_net_id_table[] = {
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{ .chan = "IP_HW0", .driver_data = (kernel_ulong_t)"mhi_hwip%d" },
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{ .chan = "IP_SW0", .driver_data = (kernel_ulong_t)"mhi_swip%d" },
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/* Hardware accelerated data PATH (to modem IPA), protocol agnostic */
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{ .chan = "IP_HW0", .driver_data = (kernel_ulong_t)&mhi_hwip0 },
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/* Software data PATH (to modem CPU) */
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{ .chan = "IP_SW0", .driver_data = (kernel_ulong_t)&mhi_swip0 },
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/* Hardware accelerated data PATH (to modem IPA), MBIM protocol */
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{ .chan = "IP_HW0_MBIM", .driver_data = (kernel_ulong_t)&mhi_hwip0_mbim },
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{}
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};
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MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);
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293
drivers/net/mhi/proto_mbim.c
Normal file
293
drivers/net/mhi/proto_mbim.c
Normal file
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@ -0,0 +1,293 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* MHI Network driver - Network over MHI bus
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*
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* Copyright (C) 2021 Linaro Ltd <loic.poulain@linaro.org>
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*
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* This driver copy some code from cdc_ncm, which is:
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* Copyright (C) ST-Ericsson 2010-2012
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* and cdc_mbim, which is:
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* Copyright (c) 2012 Smith Micro Software, Inc.
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* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
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*
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*/
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#include <linux/ethtool.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/mii.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/usbnet.h>
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#include <linux/usb/cdc_ncm.h>
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|
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#include "mhi.h"
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|
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#define MBIM_NDP16_SIGN_MASK 0x00ffffff
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struct mbim_context {
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u16 rx_seq;
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u16 tx_seq;
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};
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|
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static void __mbim_length_errors_inc(struct mhi_net_dev *dev)
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{
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u64_stats_update_begin(&dev->stats.rx_syncp);
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u64_stats_inc(&dev->stats.rx_length_errors);
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u64_stats_update_end(&dev->stats.rx_syncp);
|
||||
}
|
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|
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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;
|
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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,
|
||||
};
|
||||
Loading…
Reference in a new issue