@@ -62,8 +62,9 @@ config QCOM_EMAC
config QCOM_IPQ4019_ESS_EDMA
tristate "Qualcomm Atheros IPQ4019 ESS EDMA support"
- depends on OF
+ depends on OF && NET_DSA
select PHYLINK
+ select NET_DSA_TAG_OOB
help
This driver supports the Qualcomm Atheros IPQ40xx built-in
ESS EDMA ethernet controller.
@@ -9,6 +9,7 @@
#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/dsa/oob.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/module.h>
@@ -22,6 +23,7 @@
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <net/checksum.h>
+#include <net/dsa.h>
#include <net/ip6_checksum.h>
#include "ipqess.h"
@@ -330,6 +332,7 @@ static int ipqess_rx_poll(struct ipqess_rx_ring *rx_ring, int budget)
tail &= IPQESS_RFD_CONS_IDX_MASK;
while (done < budget) {
+ struct dsa_oob_tag_info tag_info;
struct ipqess_rx_desc *rd;
struct sk_buff *skb;
@@ -409,6 +412,12 @@ static int ipqess_rx_poll(struct ipqess_rx_ring *rx_ring, int budget)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD),
rd->rrd4);
+ if (netdev_uses_dsa(rx_ring->ess->netdev)) {
+ tag_info.dp = FIELD_GET(IPQESS_RRD_PORT_ID_MASK, rd->rrd1);
+ tag_info.proto = DSA_TAG_PROTO_OOB;
+ dsa_oob_tag_push(skb, &tag_info);
+ }
+
napi_gro_receive(&rx_ring->napi_rx, skb);
rx_ring->ess->stats.rx_packets++;
@@ -713,6 +722,22 @@ static void ipqess_rollback_tx(struct ipqess *eth,
tx_ring->head = start_index;
}
+static void ipqess_process_dsa_tag_sh(struct ipqess *ess, struct sk_buff *skb,
+ u32 *word3)
+{
+ struct dsa_oob_tag_info tag_info;
+
+ if (!netdev_uses_dsa(ess->netdev))
+ return;
+
+ if (dsa_oob_tag_pop(skb, &tag_info))
+ return;
+
+ *word3 |= tag_info.dp << IPQESS_TPD_PORT_BITMAP_SHIFT;
+ *word3 |= BIT(IPQESS_TPD_FROM_CPU_SHIFT);
+ *word3 |= 0x3e << IPQESS_TPD_PORT_BITMAP_SHIFT;
+}
+
static int ipqess_tx_map_and_fill(struct ipqess_tx_ring *tx_ring,
struct sk_buff *skb)
{
@@ -723,6 +748,8 @@ static int ipqess_tx_map_and_fill(struct ipqess_tx_ring *tx_ring,
u16 len;
int i;
+ ipqess_process_dsa_tag_sh(tx_ring->ess, skb, &word3);
+
if (skb_is_gso(skb)) {
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
lso_word1 |= IPQESS_TPD_IPV4_EN;
On the IPQ4019, there's an 5 ports switch connected to the CPU through the IPQESS Ethernet controller. The way the DSA tag is sent-out to that switch is through the DMA descriptor, due to how tightly it is integrated with the switch. This commit uses the out-of-band tagging protocol by getting the source port from the descriptor, push it into the skb, and have the tagger pull it to infer the destination netdev. The reverse process is done on the TX side, where the driver pulls the tag from the skb and builds the descriptor accordingly. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> --- V2->V3: - No changes V1->V2: - Use the new tagger, and the dsa_oob_tag_* helpers drivers/net/ethernet/qualcomm/Kconfig | 3 ++- drivers/net/ethernet/qualcomm/ipqess/ipqess.c | 27 +++++++++++++++++++ 2 files changed, 29 insertions(+), 1 deletion(-)