net: airoha: Fix TSO support for header cloned skbs

For GSO packets, skb_cow_head() will reallocate the skb for TSO header
cloned skbs in airoha_dev_xmit(). For this reason, sinfo pointer can be
no more valid. Fix the issue relying on skb_shinfo() macro directly in
airoha_dev_xmit().

The problem exists since
commit 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC")
but it is not a user visible, since we can't currently enable TSO
for DSA user ports since we are missing to initialize net_device
vlan_features field.

Reviewed-by: Mateusz Polchlopek <mateusz.polchlopek@intel.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20250213-airoha-en7581-flowtable-offload-v4-1-b69ca16d74db@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index 09f448f291240257c5748725848ede231c502fbd..aa5f220ddbcf9ca5bee1173114294cb3aec701c9 100644 (file)
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -2556,11 +2556,10 @@ static u16 airoha_dev_select_queue(struct net_device *dev, struct sk_buff *skb,
 static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
                                   struct net_device *dev)
 {
-       struct skb_shared_info *sinfo = skb_shinfo(skb);
        struct airoha_gdm_port *port = netdev_priv(dev);
+       u32 nr_frags = 1 + skb_shinfo(skb)->nr_frags;
        u32 msg0, msg1, len = skb_headlen(skb);
        struct airoha_qdma *qdma = port->qdma;
-       u32 nr_frags = 1 + sinfo->nr_frags;
        struct netdev_queue *txq;
        struct airoha_queue *q;
        void *data = skb->data;
@@ -2583,8 +2582,9 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
                if (skb_cow_head(skb, 0))
                        goto error;
 
-               if (sinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)) {
-                       __be16 csum = cpu_to_be16(sinfo->gso_size);
+               if (skb_shinfo(skb)->gso_type & (SKB_GSO_TCPV4 |
+                                                SKB_GSO_TCPV6)) {
+                       __be16 csum = cpu_to_be16(skb_shinfo(skb)->gso_size);
 
                        tcp_hdr(skb)->check = (__force __sum16)csum;
                        msg0 |= FIELD_PREP(QDMA_ETH_TXMSG_TSO_MASK, 1);
@@ -2613,7 +2613,7 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
        for (i = 0; i < nr_frags; i++) {
                struct airoha_qdma_desc *desc = &q->desc[index];
                struct airoha_queue_entry *e = &q->entry[index];
-               skb_frag_t *frag = &sinfo->frags[i];
+               skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
                dma_addr_t addr;
                u32 val;