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Merge branch 'net-ethernet-cortina-fix-various-rx-bugs'

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Linus Walleij says:

====================
net: ethernet: cortina: Fix various RX bugs

During review of a minor patch for a bug in the Cortina
ethernet driver, Sashiko jumped in and pointed out a number
of nasty bugs.

This series hopefully fixes all of them.

Signed-off-by: Linus Walleij <linusw@kernel.org>
====================

Link: https://patch.msgid.link/20260509-gemini-ethernet-fixes-v1-0-6c5d20ddc35b@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Paolo Abeni 2026-05-12 15:20:21 +02:00
commit 2cc8f49971
1 changed files with 15 additions and 3 deletions
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18
drivers/net/ethernet/cortina/gemini.c
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@ -122,6 +122,9 @@ struct gemini_ethernet_port {
struct napi_struct napi;
struct hrtimer rx_coalesce_timer;
unsigned int rx_coalesce_nsecs;
struct sk_buff *rx_skb;
unsigned int rx_frag_nr;
unsigned int freeq_refill;
struct gmac_txq txq[TX_QUEUE_NUM];
unsigned int txq_order;
@ -1442,10 +1445,11 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
unsigned short m = (1 << port->rxq_order) - 1;
struct gemini_ethernet *geth = port->geth;
void __iomem *ptr_reg = port->rxq_rwptr;
unsigned int frag_nr = port->rx_frag_nr;
struct sk_buff *skb = port->rx_skb;
unsigned int frame_len, frag_len;
struct gmac_rxdesc *rx = NULL;
struct gmac_queue_page *gpage;
static struct sk_buff *skb;
union gmac_rxdesc_0 word0;
union gmac_rxdesc_1 word1;
union gmac_rxdesc_3 word3;
@ -1455,7 +1459,6 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
unsigned short r, w;
union dma_rwptr rw;
dma_addr_t mapping;
int frag_nr = 0;
spin_lock_irqsave(&geth->irq_lock, flags);
rw.bits32 = readl(ptr_reg);
@ -1491,10 +1494,11 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
gpage = gmac_get_queue_page(geth, port, mapping + PAGE_SIZE);
if (!gpage) {
dev_err(geth->dev, "could not find mapping\n");
port->stats.rx_dropped++;
if (skb) {
napi_free_frags(&port->napi);
port->stats.rx_dropped++;
skb = NULL;
frag_nr = 0;
}
continue;
}
@ -1504,6 +1508,8 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
if (skb) {
napi_free_frags(&port->napi);
port->stats.rx_dropped++;
skb = NULL;
frag_nr = 0;
}
skb = gmac_skb_if_good_frame(port, word0, frame_len);
@ -1538,6 +1544,7 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
if (word3.bits32 & EOF_BIT) {
napi_gro_frags(&port->napi);
skb = NULL;
frag_nr = 0;
--budget;
}
continue;
@ -1546,6 +1553,7 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
if (skb) {
napi_free_frags(&port->napi);
skb = NULL;
frag_nr = 0;
}
if (mapping)
@ -1554,6 +1562,8 @@ static unsigned int gmac_rx(struct net_device *netdev, unsigned int budget)
port->stats.rx_dropped++;
}
port->rx_skb = skb;
port->rx_frag_nr = frag_nr;
writew(r, ptr_reg);
return budget;
}
@ -1881,6 +1891,8 @@ static int gmac_stop(struct net_device *netdev)
gmac_disable_tx_rx(netdev);
gmac_stop_dma(port);
napi_disable(&port->napi);
port->rx_skb = NULL;
port->rx_frag_nr = 0;
gmac_enable_irq(netdev, 0);
gmac_cleanup_rxq(netdev);