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9309cfe37a
This is an automatically generated commit. When doing `git bisect`, consider `git bisect --skip`. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
65 lines
2.5 KiB
Diff
65 lines
2.5 KiB
Diff
From d0055b03d9c8d48ad2b971821989b09ba95c39f8 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Sun, 17 Sep 2023 20:18:31 +0200
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Subject: [PATCH] net: qualcomm: ipqess: fix TX timeout errors
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Currently logic to handle napi tx completion is flawed and on the long
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run on loaded condition cause TX timeout error with the queue not being
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able to handle any new packet.
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There are 2 main cause of this:
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- incrementing the packet done value wrongly
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- handling 2 times the tx_ring tail
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ipqess_tx_unmap_and_free may return 2 kind values:
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- 0: we are handling first and middle descriptor for the packet
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- packet len: we are at the last descriptor for the packet
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Done value was wrongly incremented also for first and intermediate
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descriptor for the packet resulting causing panic and TX timeouts by
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comunicating to the kernel an inconsistent value of packet handling not
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matching the expected ones.
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Tx_ring tail was handled twice for ipqess_tx_complete run resulting in
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again done value incremented wrongly and also problem with idx handling
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by actually skipping descriptor for some packets.
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Rework the loop logic to fix these 2 problem and also add some comments
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to make sure ipqess_tx_unmap_and_free ret value is better
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understandable.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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---
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drivers/net/ethernet/qualcomm/ipqess/ipqess.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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--- a/drivers/net/ethernet/qualcomm/ipqess/ipqess.c
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+++ b/drivers/net/ethernet/qualcomm/ipqess/ipqess.c
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@@ -453,13 +453,22 @@ static int ipqess_tx_complete(struct ipq
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tail >>= IPQESS_TPD_CONS_IDX_SHIFT;
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tail &= IPQESS_TPD_CONS_IDX_MASK;
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- do {
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+ while ((tx_ring->tail != tail) && (done < budget)) {
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ret = ipqess_tx_unmap_and_free(&tx_ring->ess->pdev->dev,
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&tx_ring->buf[tx_ring->tail]);
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- tx_ring->tail = IPQESS_NEXT_IDX(tx_ring->tail, tx_ring->count);
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+ /* ipqess_tx_unmap_and_free may return 2 kind values:
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+ * - 0: we are handling first and middle descriptor for the packet
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+ * - packet len: we are at the last descriptor for the packet
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+ * Increment total bytes handled and packet done only if we are
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+ * handling the last descriptor for the packet.
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+ */
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+ if (ret) {
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+ total += ret;
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+ done++;
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+ }
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- total += ret;
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- } while ((++done < budget) && (tx_ring->tail != tail));
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+ tx_ring->tail = IPQESS_NEXT_IDX(tx_ring->tail, tx_ring->count);
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+ };
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ipqess_w32(tx_ring->ess, IPQESS_REG_TX_SW_CONS_IDX_Q(tx_ring->idx),
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tx_ring->tail);
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