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Date: Thu, 15 Aug 2013 14:26:17 +0200
From: Francois Romieu <romieu@...zoreil.com>
To: Hayes Wang <hayeswang@...ltek.com>
Cc: netdev@...r.kernel.org, nic_swsd@...ltek.com,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next v2 1/3] net/usb/r8152: support aggregation
Hayes Wang <hayeswang@...ltek.com> :
[...]
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 11c51f2..abb0b9f 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
[...]
> @@ -315,13 +318,34 @@ struct tx_desc {
> u32 opts2;
> };
>
> +struct rx_agg {
> + struct list_head list;
> + struct urb *urb;
> + void *context;
void * is not needed: context is always struct r8152 *.
> + void *buffer;
> + void *head;
> +};
> +
> +struct tx_agg {
> + struct list_head list;
> + struct urb *urb;
> + void *context;
void * is not needed: context is always struct r8152 *.
> + void *buffer;
> + void *head;
> + u32 skb_num;
> + u32 skb_len;
> +};
> +
> struct r8152 {
> unsigned long flags;
> struct usb_device *udev;
> struct tasklet_struct tl;
> struct net_device *netdev;
> - struct urb *rx_urb, *tx_urb;
> - struct sk_buff *tx_skb, *rx_skb;
> + struct tx_agg tx_info[RTL8152_MAX_TX];
> + struct rx_agg rx_info[RTL8152_MAX_RX];
> + struct list_head rx_done, tx_free;
> + struct sk_buff_head tx_queue;
> + spinlock_t rx_lock, tx_lock;
You may group rx data on one side and tx data on an other side to be
more cache friendly.
[...]
> @@ -686,6 +711,9 @@ static void ocp_reg_write(struct r8152 *tp, u16 addr, u16 data)
> ocp_write_word(tp, MCU_TYPE_PLA, ocp_index, data);
> }
>
> +static
> +int r8152_submit_rx(struct r8152 *tp, struct rx_agg *agg, gfp_t mem_flags);
> +
It's a new, less than 10 lines function without driver internal dependencies.
The forward declaration is not needed.
[...]
> @@ -743,129 +751,425 @@ static struct net_device_stats *rtl8152_get_stats(struct net_device *dev)
>
> static void read_bulk_callback(struct urb *urb)
No rtl8152_ prefix ?
> {
[...]
> - if (!netif_device_present(netdev))
> + if (!netif_carrier_ok(netdev))
> return;
How is it related to the subject of the patch ?
[...]
> +static void rx_bottom(struct r8152 *tp)
> +{
> + struct net_device_stats *stats;
> + struct net_device *netdev;
> + struct rx_agg *agg;
> + struct rx_desc *rx_desc;
> + unsigned long lockflags;
Idiom: 'flags'.
> + struct list_head *cursor, *next;
> + struct sk_buff *skb;
> + struct urb *urb;
> + unsigned pkt_len;
> + int len_used;
> + u8 *rx_data;
> + int ret;
The scope of these variables is needlessly wide.
> +
> + netdev = tp->netdev;
> +
> + stats = rtl8152_get_stats(netdev);
> +
> + spin_lock_irqsave(&tp->rx_lock, lockflags);
> + list_for_each_safe(cursor, next, &tp->rx_done) {
> + list_del_init(cursor);
> + spin_unlock_irqrestore(&tp->rx_lock, lockflags);
> +
> + agg = list_entry(cursor, struct rx_agg, list);
> + urb = agg->urb;
> + if (urb->actual_length < ETH_ZLEN) {
goto submit;
> + ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
> + spin_lock_irqsave(&tp->rx_lock, lockflags);
> + if (ret && ret != -ENODEV) {
> + list_add_tail(&agg->list, next);
> + tasklet_schedule(&tp->tl);
> + }
> + continue;
> + }
(remove the line above)
[...]
> + rx_data = rx_agg_align(rx_data + pkt_len + 4);
> + rx_desc = (struct rx_desc *)rx_data;
> + pkt_len = le32_to_cpu(rx_desc->opts1) & RX_LEN_MASK;
> + len_used = (int)(rx_data - (u8 *)agg->head);
> + len_used += sizeof(struct rx_desc) + pkt_len;
> + }
> +
submit:
> + ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
> + spin_lock_irqsave(&tp->rx_lock, lockflags);
> + if (ret && ret != -ENODEV) {
> + list_add_tail(&agg->list, next);
> + tasklet_schedule(&tp->tl);
> + }
> + }
> + spin_unlock_irqrestore(&tp->rx_lock, lockflags);
> +}
It should be possible to retrieve more items in the spinlocked section
so as to have a chance to batch more work. I have not thought too deeply
about it.
> +
> +static void tx_bottom(struct r8152 *tp)
> +{
> + struct net_device_stats *stats;
> + struct net_device *netdev;
> + struct tx_agg *agg;
> + unsigned long lockflags;
> + u32 remain, total;
> + u8 *tx_data;
> + int res;
> +
> + netdev = tp->netdev;
> +
> +next_agg:
Use a real for / while loop and split this function as you experience
line length problem.
[...]
> +static void bottom_half(unsigned long data)
> {
> struct r8152 *tp;
> - int status = urb->status;
>
> - tp = urb->context;
> - if (!tp)
> + tp = (struct r8152 *)data;
struct r8152 *tp = (struct r8152 *)data;
[...]
> - if (!netif_device_present(tp->netdev))
> +
> + if (!netif_carrier_ok(tp->netdev))
> return;
It deserves an explanation.
[...]
> @@ -923,33 +1227,44 @@ static netdev_tx_t rtl8152_start_xmit(struct sk_buff *skb,
> {
[...]
> + spin_lock_irqsave(&tp->tx_lock, lockflags);
> + if (!list_empty(&tp->tx_free) && skb_queue_empty(&tp->tx_queue)) {
> + struct list_head *cursor;
> +
> + cursor = tp->tx_free.next;
> + list_del_init(cursor);
> + agg = list_entry(cursor, struct tx_agg, list);
Duplicated in tx_bottom.
[...]
> @@ -999,17 +1313,18 @@ static inline u8 rtl8152_get_speed(struct r8152 *tp)
>
> static int rtl8152_enable(struct r8152 *tp)
> {
> - u32 ocp_data;
> + u32 ocp_data;
> + int i, ret;
> u8 speed;
>
> speed = rtl8152_get_speed(tp);
> - if (speed & _100bps) {
> + if (speed & _10bps) {
> ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR);
> - ocp_data &= ~EEEP_CR_EEEP_TX;
> + ocp_data |= EEEP_CR_EEEP_TX;
> ocp_write_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR, ocp_data);
> } else {
> ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_EEEP_CR);
> - ocp_data |= EEEP_CR_EEEP_TX;
> + ocp_data &= ~EEEP_CR_EEEP_TX;
Call me "Mickey Mouse" if this is related to the subject of the patch.
[...]
> @@ -1631,10 +1965,12 @@ static int rtl8152_probe(struct usb_interface *intf,
> return -ENOMEM;
> }
>
> + SET_NETDEV_DEV(netdev, &intf->dev);
> tp = netdev_priv(netdev);
> + memset(tp, 0, sizeof(*tp));
Useless, see kzalloc in net/core/dev.c::alloc_netdev_mqs
--
Ueimor
--
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