[PATCH net-next v3 1/8] net: ethernet: mvneta: Fix napi structure mixup on armada 3700

From: Gregory CLEMENT
Date: Wed Jul 18 2018 - 12:12:01 EST


From: Andrew Lunn <andrew@xxxxxxx>

The mvneta Ethernet driver is used on a few different Marvell SoCs.
Some SoCs have per cpu interrupts for Ethernet events. Some SoCs have
a single interrupt, independent of the CPU. The driver handles this by
having a per CPU napi structure when there are per CPU interrupts, and
a global napi structure when there is a single interrupt.

When the napi core calls mvneta_poll(), it passes the napi
instance. This was not being propagated through the call chain, and
instead the per-cpu napi instance was passed to napi_gro_receive()
call. This breaks when there is a single global napi instance.

Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
Fixes: 2636ac3cc2b4 ("net: mvneta: Add network support for Armada 3700 SoC")
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
---
drivers/net/ethernet/marvell/mvneta.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 0ad2f3f7da85..ec84db47d82d 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -1901,10 +1901,10 @@ static void mvneta_rxq_drop_pkts(struct mvneta_port *pp,
}

/* Main rx processing when using software buffer management */
-static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,
+static int mvneta_rx_swbm(struct napi_struct *napi,
+ struct mvneta_port *pp, int rx_todo,
struct mvneta_rx_queue *rxq)
{
- struct mvneta_pcpu_port *port = this_cpu_ptr(pp->ports);
struct net_device *dev = pp->dev;
int rx_done;
u32 rcvd_pkts = 0;
@@ -1959,7 +1959,7 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,

skb->protocol = eth_type_trans(skb, dev);
mvneta_rx_csum(pp, rx_status, skb);
- napi_gro_receive(&port->napi, skb);
+ napi_gro_receive(napi, skb);

rcvd_pkts++;
rcvd_bytes += rx_bytes;
@@ -2001,7 +2001,7 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,

mvneta_rx_csum(pp, rx_status, skb);

- napi_gro_receive(&port->napi, skb);
+ napi_gro_receive(napi, skb);
}

if (rcvd_pkts) {
@@ -2020,10 +2020,10 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo,
}

/* Main rx processing when using hardware buffer management */
-static int mvneta_rx_hwbm(struct mvneta_port *pp, int rx_todo,
+static int mvneta_rx_hwbm(struct napi_struct *napi,
+ struct mvneta_port *pp, int rx_todo,
struct mvneta_rx_queue *rxq)
{
- struct mvneta_pcpu_port *port = this_cpu_ptr(pp->ports);
struct net_device *dev = pp->dev;
int rx_done;
u32 rcvd_pkts = 0;
@@ -2085,7 +2085,7 @@ static int mvneta_rx_hwbm(struct mvneta_port *pp, int rx_todo,

skb->protocol = eth_type_trans(skb, dev);
mvneta_rx_csum(pp, rx_status, skb);
- napi_gro_receive(&port->napi, skb);
+ napi_gro_receive(napi, skb);

rcvd_pkts++;
rcvd_bytes += rx_bytes;
@@ -2129,7 +2129,7 @@ static int mvneta_rx_hwbm(struct mvneta_port *pp, int rx_todo,

mvneta_rx_csum(pp, rx_status, skb);

- napi_gro_receive(&port->napi, skb);
+ napi_gro_receive(napi, skb);
}

if (rcvd_pkts) {
@@ -2722,9 +2722,11 @@ static int mvneta_poll(struct napi_struct *napi, int budget)
if (rx_queue) {
rx_queue = rx_queue - 1;
if (pp->bm_priv)
- rx_done = mvneta_rx_hwbm(pp, budget, &pp->rxqs[rx_queue]);
+ rx_done = mvneta_rx_hwbm(napi, pp, budget,
+ &pp->rxqs[rx_queue]);
else
- rx_done = mvneta_rx_swbm(pp, budget, &pp->rxqs[rx_queue]);
+ rx_done = mvneta_rx_swbm(napi, pp, budget,
+ &pp->rxqs[rx_queue]);
}

if (rx_done < budget) {
--
2.18.0