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84 lines
2.9 KiB
Diff
84 lines
2.9 KiB
Diff
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From 66eee612a1ba39f9a76a9ace4a34d012044767fb Mon Sep 17 00:00:00 2001
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From: Hayes Wang <hayeswang@realtek.com>
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Date: Tue, 26 Sep 2023 19:17:13 +0800
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Subject: [PATCH] r8152: break the loop when the budget is exhausted
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[ Upstream commit 2cf51f931797d9a47e75d999d0993a68cbd2a560 ]
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A bulk transfer of the USB may contain many packets. And, the total
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number of the packets in the bulk transfer may be more than budget.
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Originally, only budget packets would be handled by napi_gro_receive(),
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and the other packets would be queued in the driver for next schedule.
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This patch would break the loop about getting next bulk transfer, when
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the budget is exhausted. That is, only the current bulk transfer would
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be handled, and the other bulk transfers would be queued for next
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schedule. Besides, the packets which are more than the budget in the
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current bulk trasnfer would be still queued in the driver, as the
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original method.
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In addition, a bulk transfer wouldn't contain more than 400 packets, so
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the check of queue length is unnecessary. Therefore, I replace it with
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WARN_ON_ONCE().
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Fixes: cf74eb5a5bc8 ("eth: r8152: try to use a normal budget")
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Signed-off-by: Hayes Wang <hayeswang@realtek.com>
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Link: https://lore.kernel.org/r/20230926111714.9448-433-nic_swsd@realtek.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Signed-off-by: Sasha Levin <sashal@kernel.org>
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---
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drivers/net/usb/r8152.c | 18 +++++++++++++-----
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1 file changed, 13 insertions(+), 5 deletions(-)
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--- a/drivers/net/usb/r8152.c
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+++ b/drivers/net/usb/r8152.c
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@@ -2539,7 +2539,7 @@ static int rx_bottom(struct r8152 *tp, i
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}
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}
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- if (list_empty(&tp->rx_done))
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+ if (list_empty(&tp->rx_done) || work_done >= budget)
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goto out1;
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clear_bit(RX_EPROTO, &tp->flags);
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@@ -2555,6 +2555,15 @@ static int rx_bottom(struct r8152 *tp, i
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struct urb *urb;
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u8 *rx_data;
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+ /* A bulk transfer of USB may contain may packets, so the
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+ * total packets may more than the budget. Deal with all
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+ * packets in current bulk transfer, and stop to handle the
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+ * next bulk transfer until next schedule, if budget is
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+ * exhausted.
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+ */
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+ if (work_done >= budget)
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+ break;
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+
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list_del_init(cursor);
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agg = list_entry(cursor, struct rx_agg, list);
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@@ -2574,9 +2583,7 @@ static int rx_bottom(struct r8152 *tp, i
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unsigned int pkt_len, rx_frag_head_sz;
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struct sk_buff *skb;
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- /* limit the skb numbers for rx_queue */
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- if (unlikely(skb_queue_len(&tp->rx_queue) >= 1000))
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- break;
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+ WARN_ON_ONCE(skb_queue_len(&tp->rx_queue) >= 1000);
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pkt_len = le32_to_cpu(rx_desc->opts1) & RX_LEN_MASK;
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if (pkt_len < ETH_ZLEN)
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@@ -2654,9 +2661,10 @@ submit:
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}
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}
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+ /* Splice the remained list back to rx_done for next schedule */
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if (!list_empty(&rx_queue)) {
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spin_lock_irqsave(&tp->rx_lock, flags);
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- list_splice_tail(&rx_queue, &tp->rx_done);
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+ list_splice(&rx_queue, &tp->rx_done);
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spin_unlock_irqrestore(&tp->rx_lock, flags);
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}
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