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Message-Id: <1612861558-14487-2-git-send-email-loic.poulain@linaro.org>
Date: Tue, 9 Feb 2021 10:05:54 +0100
From: Loic Poulain <loic.poulain@...aro.org>
To: kuba@...nel.org, davem@...emloft.net
Cc: netdev@...r.kernel.org, bjorn@...k.no, dcbw@...hat.com,
carl.yin@...ctel.com, mpearson@...ovo.com, cchen50@...ovo.com,
jwjiang@...ovo.com, ivan.zhang@...ctel.com,
naveen.kumar@...ctel.com, ivan.mikhanchuk@...ctel.com,
Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH net-next v5 1/5] net: mhi: Add protocol support
MHI can transport different protocols, some are handled at upper level,
like IP and QMAP(rmnet/netlink), but others will need to be inside MHI
net driver, like mbim. This change adds support for protocol rx and
tx_fixup callbacks registration, that can be used to encode/decode the
targeted protocol.
Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
drivers/net/mhi_net.c | 69 ++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 57 insertions(+), 12 deletions(-)
diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
index 8800991..b92c2e1 100644
--- a/drivers/net/mhi_net.c
+++ b/drivers/net/mhi_net.c
@@ -34,11 +34,24 @@ struct mhi_net_dev {
struct net_device *ndev;
struct sk_buff *skbagg_head;
struct sk_buff *skbagg_tail;
+ const struct mhi_net_proto *proto;
+ void *proto_data;
struct delayed_work rx_refill;
struct mhi_net_stats stats;
u32 rx_queue_sz;
};
+struct mhi_net_proto {
+ int (*init)(struct mhi_net_dev *mhi_netdev);
+ 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);
+};
+
+struct mhi_device_info {
+ const char *netname;
+ const struct mhi_net_proto *proto;
+};
+
static int mhi_ndo_open(struct net_device *ndev)
{
struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
@@ -68,26 +81,35 @@ static int mhi_ndo_stop(struct net_device *ndev)
static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
+ const struct mhi_net_proto *proto = mhi_netdev->proto;
struct mhi_device *mdev = mhi_netdev->mdev;
int err;
+ if (proto && proto->tx_fixup) {
+ skb = proto->tx_fixup(mhi_netdev, skb);
+ if (unlikely(!skb))
+ goto exit_drop;
+ }
+
err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT);
if (unlikely(err)) {
net_err_ratelimited("%s: Failed to queue TX buf (%d)\n",
ndev->name, err);
-
- u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
- u64_stats_inc(&mhi_netdev->stats.tx_dropped);
- u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
-
- /* drop the packet */
dev_kfree_skb_any(skb);
+ goto exit_drop;
}
if (mhi_queue_is_full(mdev, DMA_TO_DEVICE))
netif_stop_queue(ndev);
return NETDEV_TX_OK;
+
+exit_drop:
+ u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
+ u64_stats_inc(&mhi_netdev->stats.tx_dropped);
+ u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
+
+ return NETDEV_TX_OK;
}
static void mhi_ndo_get_stats64(struct net_device *ndev,
@@ -164,6 +186,7 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
struct mhi_result *mhi_res)
{
struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
+ const struct mhi_net_proto *proto = mhi_netdev->proto;
struct sk_buff *skb = mhi_res->buf_addr;
int free_desc_count;
@@ -220,7 +243,10 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
break;
}
- netif_rx(skb);
+ if (proto && proto->rx)
+ proto->rx(mhi_netdev, skb);
+ else
+ netif_rx(skb);
}
/* Refill if RX buffers queue becomes low */
@@ -302,14 +328,14 @@ static struct device_type wwan_type = {
static int mhi_net_probe(struct mhi_device *mhi_dev,
const struct mhi_device_id *id)
{
- const char *netname = (char *)id->driver_data;
+ const struct mhi_device_info *info = (struct mhi_device_info *)id->driver_data;
struct device *dev = &mhi_dev->dev;
struct mhi_net_dev *mhi_netdev;
struct net_device *ndev;
int err;
- ndev = alloc_netdev(sizeof(*mhi_netdev), netname, NET_NAME_PREDICTABLE,
- mhi_net_setup);
+ ndev = alloc_netdev(sizeof(*mhi_netdev), info->netname,
+ NET_NAME_PREDICTABLE, mhi_net_setup);
if (!ndev)
return -ENOMEM;
@@ -318,6 +344,7 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
mhi_netdev->ndev = ndev;
mhi_netdev->mdev = mhi_dev;
mhi_netdev->skbagg_head = NULL;
+ mhi_netdev->proto = info->proto;
SET_NETDEV_DEV(ndev, &mhi_dev->dev);
SET_NETDEV_DEVTYPE(ndev, &wwan_type);
@@ -337,8 +364,16 @@ static int mhi_net_probe(struct mhi_device *mhi_dev,
if (err)
goto out_err;
+ if (mhi_netdev->proto) {
+ err = mhi_netdev->proto->init(mhi_netdev);
+ if (err)
+ goto out_err_proto;
+ }
+
return 0;
+out_err_proto:
+ unregister_netdev(ndev);
out_err:
free_netdev(ndev);
return err;
@@ -358,9 +393,19 @@ static void mhi_net_remove(struct mhi_device *mhi_dev)
free_netdev(mhi_netdev->ndev);
}
+static const struct mhi_device_info mhi_hwip0 = {
+ .netname = "mhi_hwip%d",
+};
+
+static const struct mhi_device_info mhi_swip0 = {
+ .netname = "mhi_swip%d",
+};
+
static const struct mhi_device_id mhi_net_id_table[] = {
- { .chan = "IP_HW0", .driver_data = (kernel_ulong_t)"mhi_hwip%d" },
- { .chan = "IP_SW0", .driver_data = (kernel_ulong_t)"mhi_swip%d" },
+ /* 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 },
{}
};
MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);
--
2.7.4
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