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66 lines
2.3 KiB
Diff
66 lines
2.3 KiB
Diff
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From ef3556ee16c68735ec69bd08df41d1cd83b14ad3 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Thu, 27 Oct 2022 13:24:30 +0200
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Subject: [PATCH] net: broadcom: bcm4908_enet: update TX stats after actual
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transmission
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Queueing packets doesn't guarantee their transmission. Update TX stats
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after hardware confirms consuming submitted data.
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This also fixes a possible race and NULL dereference.
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bcm4908_enet_start_xmit() could try to access skb after freeing it in
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the bcm4908_enet_poll_tx().
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Reported-by: Florian Fainelli <f.fainelli@gmail.com>
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Fixes: 4feffeadbcb2e ("net: broadcom: bcm4908enet: add BCM4908 controller driver")
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Link: https://lore.kernel.org/r/20221027112430.8696-1-zajec5@gmail.com
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Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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---
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drivers/net/ethernet/broadcom/bcm4908_enet.c | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
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+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
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@@ -560,8 +560,6 @@ static int bcm4908_enet_start_xmit(struc
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if (++ring->write_idx == ring->length - 1)
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ring->write_idx = 0;
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- enet->netdev->stats.tx_bytes += skb->len;
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- enet->netdev->stats.tx_packets++;
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return NETDEV_TX_OK;
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}
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@@ -634,6 +632,7 @@ static int bcm4908_enet_poll_tx(struct n
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struct bcm4908_enet_dma_ring_bd *buf_desc;
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struct bcm4908_enet_dma_ring_slot *slot;
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struct device *dev = enet->dev;
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+ unsigned int bytes = 0;
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int handled = 0;
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while (handled < weight && tx_ring->read_idx != tx_ring->write_idx) {
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@@ -644,12 +643,17 @@ static int bcm4908_enet_poll_tx(struct n
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dma_unmap_single(dev, slot->dma_addr, slot->len, DMA_TO_DEVICE);
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dev_kfree_skb(slot->skb);
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- if (++tx_ring->read_idx == tx_ring->length)
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- tx_ring->read_idx = 0;
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handled++;
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+ bytes += slot->len;
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+
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+ if (++tx_ring->read_idx == tx_ring->length)
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+ tx_ring->read_idx = 0;
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}
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+ enet->netdev->stats.tx_packets += handled;
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+ enet->netdev->stats.tx_bytes += bytes;
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+
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if (handled < weight) {
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napi_complete_done(napi, handled);
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bcm4908_enet_dma_ring_intrs_on(enet, tx_ring);
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