v3:
For patch #1, this patch is replaced. The new patch only break the loop,
and keep that the driver would queue the rx packets.
For patch #2, modify the code depends on patch #1. For work_down < budget,
napi_get_frags() and napi_gro_frags() would be used. For the others,
nothing is changed.
v2:
For patch #1, add comment, update commit message, and add Fixes tag.
v1:
These patches are used to improve rx_bottom().
Hayes Wang (2):
r8152: break the loop when the budget is exhausted
r8152: use napi_gro_frags
drivers/net/usb/r8152.c | 85 ++++++++++++++++++++++++++++++-----------
1 file changed, 63 insertions(+), 22 deletions(-)
--
2.41.0
Use napi_gro_frags() for the skb of fragments when the work_done is less
than budget.
Signed-off-by: Hayes Wang <[email protected]>
---
drivers/net/usb/r8152.c | 67 ++++++++++++++++++++++++++++++-----------
1 file changed, 50 insertions(+), 17 deletions(-)
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index c4038def193f..1231bf365796 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -2490,8 +2490,9 @@ 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, rx_frag_head_sz;
+ unsigned int pkt_len, rx_frag_head_sz, len;
struct sk_buff *skb;
+ bool use_frags;
WARN_ON_ONCE(skb_queue_len(&tp->rx_queue) >= 1000);
@@ -2504,45 +2505,77 @@ static int rx_bottom(struct r8152 *tp, int budget)
break;
pkt_len -= ETH_FCS_LEN;
+ len = pkt_len;
rx_data += sizeof(struct rx_desc);
- if (!agg_free || tp->rx_copybreak > pkt_len)
- rx_frag_head_sz = pkt_len;
+ if (!agg_free || tp->rx_copybreak > len)
+ use_frags = false;
else
- rx_frag_head_sz = tp->rx_copybreak;
+ use_frags = true;
+
+ if (use_frags) {
+ /* If the budget is exhausted, the packet
+ * would be queued in the driver. That is,
+ * napi_gro_frags() wouldn't be called, so
+ * we couldn't use napi_get_frags().
+ */
+ if (work_done >= budget) {
+ rx_frag_head_sz = tp->rx_copybreak;
+ skb = napi_alloc_skb(napi,
+ rx_frag_head_sz);
+ } else {
+ rx_frag_head_sz = 0;
+ skb = napi_get_frags(napi);
+ }
+ } else {
+ rx_frag_head_sz = 0;
+ skb = napi_alloc_skb(napi, len);
+ }
- 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, 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) {
+ rtl_rx_vlan_tag(rx_desc, skb);
+
+ if (use_frags) {
+ if (rx_frag_head_sz) {
+ memcpy(skb->data, rx_data,
+ rx_frag_head_sz);
+ skb_put(skb, rx_frag_head_sz);
+ len -= rx_frag_head_sz;
+ rx_data += rx_frag_head_sz;
+ skb->protocol = eth_type_trans(skb,
+ netdev);
+ }
+
skb_add_rx_frag(skb, 0, agg->page,
agg_offset(agg, rx_data),
- pkt_len,
- SKB_DATA_ALIGN(pkt_len));
+ len, SKB_DATA_ALIGN(len));
get_page(agg->page);
+ } else {
+ memcpy(skb->data, rx_data, len);
+ skb_put(skb, len);
+ skb->protocol = eth_type_trans(skb, netdev);
}
- skb->protocol = eth_type_trans(skb, netdev);
- rtl_rx_vlan_tag(rx_desc, skb);
if (work_done < budget) {
+ if (use_frags)
+ napi_gro_frags(napi);
+ else
+ napi_gro_receive(napi, skb);
+
work_done++;
stats->rx_packets++;
- stats->rx_bytes += skb->len;
- napi_gro_receive(napi, skb);
+ stats->rx_bytes += pkt_len;
} else {
__skb_queue_tail(&tp->rx_queue, skb);
}
find_next_rx:
- rx_data = rx_agg_align(rx_data + pkt_len + ETH_FCS_LEN);
+ rx_data = rx_agg_align(rx_data + len + ETH_FCS_LEN);
rx_desc = (struct rx_desc *)rx_data;
len_used = agg_offset(agg, rx_data);
len_used += sizeof(struct rx_desc);
--
2.41.0
Hello:
This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <[email protected]>:
On Tue, 26 Sep 2023 19:17:12 +0800 you wrote:
> v3:
> For patch #1, this patch is replaced. The new patch only break the loop,
> and keep that the driver would queue the rx packets.
>
> For patch #2, modify the code depends on patch #1. For work_down < budget,
> napi_get_frags() and napi_gro_frags() would be used. For the others,
> nothing is changed.
>
> [...]
Here is the summary with links:
- [net-next,v3,1/2] r8152: break the loop when the budget is exhausted
https://git.kernel.org/netdev/net-next/c/2cf51f931797
- [net-next,v3,2/2] r8152: use napi_gro_frags
https://git.kernel.org/netdev/net-next/c/788d30daa8f9
You are awesome, thank you!
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