Use skb_add_rx_frag() to reduce the memory copy for rx data.
Use a new list of rx_used to store the rx buffer which couldn't be
reused yet.
Besides, the total number of rx buffer may be increased or decreased
dynamically. And it is limited by RTL8152_MAX_RX_AGG.
Signed-off-by: Hayes Wang <[email protected]>
---
drivers/net/usb/r8152.c | 122 +++++++++++++++++++++++++++++++++++-----
1 file changed, 108 insertions(+), 14 deletions(-)
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 401e56112365..1615900c8592 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -584,6 +584,9 @@ enum rtl_register_content {
#define TX_ALIGN 4
#define RX_ALIGN 8
+#define RTL8152_MAX_RX_AGG (10 * RTL8152_MAX_RX)
+#define RTL8152_RXFG_HEADSZ 256
+
#define INTR_LINK 0x0004
#define RTL8152_REQT_READ 0xc0
@@ -720,7 +723,7 @@ struct r8152 {
struct net_device *netdev;
struct urb *intr_urb;
struct tx_agg tx_info[RTL8152_MAX_TX];
- struct list_head rx_info;
+ struct list_head rx_info, rx_used;
struct list_head rx_done, tx_free;
struct sk_buff_head tx_queue, rx_queue;
spinlock_t rx_lock, tx_lock;
@@ -1476,7 +1479,7 @@ static void free_rx_agg(struct r8152 *tp, struct rx_agg *agg)
list_del(&agg->info_list);
usb_free_urb(agg->urb);
- __free_pages(agg->page, get_order(tp->rx_buf_sz));
+ put_page(agg->page);
kfree(agg);
atomic_dec(&tp->rx_count);
@@ -1493,7 +1496,7 @@ static struct rx_agg *alloc_rx_agg(struct r8152 *tp, gfp_t mflags)
if (rx_agg) {
unsigned long flags;
- rx_agg->page = alloc_pages(mflags, order);
+ rx_agg->page = alloc_pages(mflags | __GFP_COMP, order);
if (!rx_agg->page)
goto free_rx;
@@ -1951,6 +1954,50 @@ static u8 r8152_rx_csum(struct r8152 *tp, struct rx_desc *rx_desc)
return checksum;
}
+static inline bool rx_count_exceed(struct r8152 *tp)
+{
+ return atomic_read(&tp->rx_count) > RTL8152_MAX_RX;
+}
+
+static inline int agg_offset(struct rx_agg *agg, void *addr)
+{
+ return (int)(addr - agg->buffer);
+}
+
+static struct rx_agg *rtl_get_free_rx(struct r8152 *tp, gfp_t mflags)
+{
+ struct list_head *cursor, *next;
+ struct rx_agg *agg_free = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tp->rx_lock, flags);
+
+ list_for_each_safe(cursor, next, &tp->rx_used) {
+ struct rx_agg *agg;
+
+ agg = list_entry(cursor, struct rx_agg, list);
+
+ if (page_count(agg->page) == 1) {
+ if (!agg_free) {
+ list_del_init(cursor);
+ agg_free = agg;
+ continue;
+ } else if (rx_count_exceed(tp)) {
+ list_del_init(cursor);
+ free_rx_agg(tp, agg);
+ }
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&tp->rx_lock, flags);
+
+ if (!agg_free && atomic_read(&tp->rx_count) < RTL8152_MAX_RX_AGG)
+ agg_free = alloc_rx_agg(tp, mflags);
+
+ return agg_free;
+}
+
static int rx_bottom(struct r8152 *tp, int budget)
{
unsigned long flags;
@@ -1986,7 +2033,7 @@ static int rx_bottom(struct r8152 *tp, int budget)
list_for_each_safe(cursor, next, &rx_queue) {
struct rx_desc *rx_desc;
- struct rx_agg *agg;
+ struct rx_agg *agg, *agg_next;
int len_used = 0;
struct urb *urb;
u8 *rx_data;
@@ -1998,6 +2045,8 @@ static int rx_bottom(struct r8152 *tp, int budget)
if (urb->actual_length < ETH_ZLEN)
goto submit;
+ agg_next = rtl_get_free_rx(tp, GFP_ATOMIC);
+
rx_desc = agg->buffer;
rx_data = agg->buffer;
len_used += sizeof(struct rx_desc);
@@ -2005,7 +2054,7 @@ static int rx_bottom(struct r8152 *tp, int budget)
while (urb->actual_length > len_used) {
struct net_device *netdev = tp->netdev;
struct net_device_stats *stats = &netdev->stats;
- unsigned int pkt_len;
+ unsigned int pkt_len, rx_frag_head_sz;
struct sk_buff *skb;
/* limite the skb numbers for rx_queue */
@@ -2023,22 +2072,37 @@ static int rx_bottom(struct r8152 *tp, int budget)
pkt_len -= ETH_FCS_LEN;
rx_data += sizeof(struct rx_desc);
- skb = napi_alloc_skb(napi, pkt_len);
+ if (!agg_next || RTL8152_RXFG_HEADSZ > pkt_len)
+ rx_frag_head_sz = pkt_len;
+ else
+ rx_frag_head_sz = RTL8152_RXFG_HEADSZ;
+
+ skb = napi_alloc_skb(napi, rx_frag_head_sz);
if (!skb) {
stats->rx_dropped++;
goto find_next_rx;
}
skb->ip_summed = r8152_rx_csum(tp, rx_desc);
- memcpy(skb->data, rx_data, pkt_len);
- skb_put(skb, pkt_len);
+ memcpy(skb->data, rx_data, rx_frag_head_sz);
+ skb_put(skb, rx_frag_head_sz);
+ pkt_len -= rx_frag_head_sz;
+ rx_data += rx_frag_head_sz;
+ if (pkt_len) {
+ skb_add_rx_frag(skb, 0, agg->page,
+ agg_offset(agg, rx_data),
+ pkt_len,
+ SKB_DATA_ALIGN(pkt_len));
+ get_page(agg->page);
+ }
+
skb->protocol = eth_type_trans(skb, netdev);
rtl_rx_vlan_tag(rx_desc, skb);
if (work_done < budget) {
napi_gro_receive(napi, skb);
work_done++;
stats->rx_packets++;
- stats->rx_bytes += pkt_len;
+ stats->rx_bytes += skb->len;
} else {
__skb_queue_tail(&tp->rx_queue, skb);
}
@@ -2046,10 +2110,24 @@ static int rx_bottom(struct r8152 *tp, int budget)
find_next_rx:
rx_data = rx_agg_align(rx_data + pkt_len + ETH_FCS_LEN);
rx_desc = (struct rx_desc *)rx_data;
- len_used = (int)(rx_data - (u8 *)agg->buffer);
+ len_used = agg_offset(agg, rx_data);
len_used += sizeof(struct rx_desc);
}
+ WARN_ON(!agg_next && page_count(agg->page) > 1);
+
+ if (agg_next) {
+ spin_lock_irqsave(&tp->rx_lock, flags);
+ if (page_count(agg->page) == 1) {
+ list_add(&agg_next->list, &tp->rx_used);
+ } else {
+ list_add_tail(&agg->list, &tp->rx_used);
+ agg = agg_next;
+ urb = agg->urb;
+ }
+ spin_unlock_irqrestore(&tp->rx_lock, flags);
+ }
+
submit:
if (!ret) {
ret = r8152_submit_rx(tp, agg, GFP_ATOMIC);
@@ -2376,13 +2454,14 @@ static int rtl_start_rx(struct r8152 *tp)
{
struct list_head *cursor, *next, tmp_list;
unsigned long flags;
- int ret = 0;
+ int ret = 0, i = 0;
INIT_LIST_HEAD(&tmp_list);
spin_lock_irqsave(&tp->rx_lock, flags);
INIT_LIST_HEAD(&tp->rx_done);
+ INIT_LIST_HEAD(&tp->rx_used);
list_splice_init(&tp->rx_info, &tmp_list);
@@ -2394,10 +2473,18 @@ static int rtl_start_rx(struct r8152 *tp)
agg = list_entry(cursor, struct rx_agg, info_list);
INIT_LIST_HEAD(&agg->list);
- if (ret < 0)
+ /* Only RTL8152_MAX_RX rx_agg need to be submitted. */
+ if (++i > RTL8152_MAX_RX) {
+ spin_lock_irqsave(&tp->rx_lock, flags);
+ list_add_tail(&agg->list, &tp->rx_used);
+ spin_unlock_irqrestore(&tp->rx_lock, flags);
+ } else if (unlikely(ret < 0)) {
+ spin_lock_irqsave(&tp->rx_lock, flags);
list_add_tail(&agg->list, &tp->rx_done);
- else
+ spin_unlock_irqrestore(&tp->rx_lock, flags);
+ } else {
ret = r8152_submit_rx(tp, agg, GFP_KERNEL);
+ }
}
spin_lock_irqsave(&tp->rx_lock, flags);
@@ -2429,7 +2516,14 @@ static int rtl_stop_rx(struct r8152 *tp)
struct rx_agg *agg;
agg = list_entry(cursor, struct rx_agg, info_list);
- usb_kill_urb(agg->urb);
+
+ /* At least RTL8152_MAX_RX rx_agg have the page_count being
+ * equal to 1, so the other ones could be freed safely.
+ */
+ if (page_count(agg->page) > 1)
+ free_rx_agg(tp, agg);
+ else
+ usb_kill_urb(agg->urb);
}
/* Move back the list of temp to the rx_info */
--
2.21.0
On Tue, 6 Aug 2019 19:18:03 +0800, Hayes Wang wrote:
> Use skb_add_rx_frag() to reduce the memory copy for rx data.
>
> Use a new list of rx_used to store the rx buffer which couldn't be
> reused yet.
>
> Besides, the total number of rx buffer may be increased or decreased
> dynamically. And it is limited by RTL8152_MAX_RX_AGG.
>
> Signed-off-by: Hayes Wang <[email protected]>
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 401e56112365..1615900c8592 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -584,6 +584,9 @@ enum rtl_register_content {
> #define TX_ALIGN 4
> #define RX_ALIGN 8
>
> +#define RTL8152_MAX_RX_AGG (10 * RTL8152_MAX_RX)
> +#define RTL8152_RXFG_HEADSZ 256
> +
> #define INTR_LINK 0x0004
>
> #define RTL8152_REQT_READ 0xc0
> @@ -720,7 +723,7 @@ struct r8152 {
> struct net_device *netdev;
> struct urb *intr_urb;
> struct tx_agg tx_info[RTL8152_MAX_TX];
> - struct list_head rx_info;
> + struct list_head rx_info, rx_used;
I don't see where entries on the rx_used list get freed when driver is
unloaded, could you explain how that's taken care of?
> struct list_head rx_done, tx_free;
> struct sk_buff_head tx_queue, rx_queue;
> spinlock_t rx_lock, tx_lock;
> @@ -1476,7 +1479,7 @@ static void free_rx_agg(struct r8152 *tp, struct rx_agg *agg)
> list_del(&agg->info_list);
>
> usb_free_urb(agg->urb);
> - __free_pages(agg->page, get_order(tp->rx_buf_sz));
> + put_page(agg->page);
> kfree(agg);
>
> atomic_dec(&tp->rx_count);
> @@ -1493,7 +1496,7 @@ static struct rx_agg *alloc_rx_agg(struct r8152 *tp, gfp_t mflags)
> if (rx_agg) {
> unsigned long flags;
>
> - rx_agg->page = alloc_pages(mflags, order);
> + rx_agg->page = alloc_pages(mflags | __GFP_COMP, order);
> if (!rx_agg->page)
> goto free_rx;
>
> @@ -1951,6 +1954,50 @@ static u8 r8152_rx_csum(struct r8152 *tp, struct rx_desc *rx_desc)
> return checksum;
> }
>
> +static inline bool rx_count_exceed(struct r8152 *tp)
> +{
> + return atomic_read(&tp->rx_count) > RTL8152_MAX_RX;
> +}
> +
> +static inline int agg_offset(struct rx_agg *agg, void *addr)
> +{
> + return (int)(addr - agg->buffer);
> +}
> +
> +static struct rx_agg *rtl_get_free_rx(struct r8152 *tp, gfp_t mflags)
> +{
> + struct list_head *cursor, *next;
> + struct rx_agg *agg_free = NULL;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&tp->rx_lock, flags);
> +
> + list_for_each_safe(cursor, next, &tp->rx_used) {
> + struct rx_agg *agg;
> +
> + agg = list_entry(cursor, struct rx_agg, list);
> +
> + if (page_count(agg->page) == 1) {
> + if (!agg_free) {
> + list_del_init(cursor);
> + agg_free = agg;
> + continue;
> + } else if (rx_count_exceed(tp)) {
nit: else unnecessary after continue
> + list_del_init(cursor);
> + free_rx_agg(tp, agg);
> + }
> + break;
> + }
> + }
> +
> + spin_unlock_irqrestore(&tp->rx_lock, flags);
> +
> + if (!agg_free && atomic_read(&tp->rx_count) < RTL8152_MAX_RX_AGG)
> + agg_free = alloc_rx_agg(tp, mflags);
> +
> + return agg_free;
> +}
> +
> static int rx_bottom(struct r8152 *tp, int budget)
> {
> unsigned long flags;
Jakub Kicinski [mailto:[email protected]]
> Sent: Wednesday, August 07, 2019 6:08 AM
[...]
> > #define RTL8152_REQT_READ 0xc0
> > @@ -720,7 +723,7 @@ struct r8152 {
> > struct net_device *netdev;
> > struct urb *intr_urb;
> > struct tx_agg tx_info[RTL8152_MAX_TX];
> > - struct list_head rx_info;
> > + struct list_head rx_info, rx_used;
>
> I don't see where entries on the rx_used list get freed when driver is
> unloaded, could you explain how that's taken care of?
When the driver is unloaded, all rx_agg would be freed from
info_list list.
The info_list includes all rx_agg buffers which may be idle
or be busy. The rx_done and rx_use are used to determine
the status of rx_agg buffer included in info_list.
info_list: the rx_agg buffer would be inserted in this list
when it is allocated.
rx_done: the rx_agg buffer is ready (contains rx data). Or
it needs to be resubmitted.
rx_use: the rx_agg buffer is busy and couldn't be submitted
yet.
Best Regards,
Hayes