linux-kernel - [PATCH net-next 2/3] netmem, devmem, tcp: access pp fields through @desc in net

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Message-Id: <20251121040047.71921-2-byungchul@sk.com>
Date: Fri, 21 Nov 2025 13:00:46 +0900
From: Byungchul Park <byungchul@...com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	kernel_team@...ynix.com,
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Subject: [PATCH net-next 2/3] netmem, devmem, tcp: access pp fields through @desc in net_iov

Convert all the legacy code directly accessing the pp fields in net_iov
to access them through @desc in net_iov.

Signed-off-by: Byungchul Park <byungchul@...com>
---
 include/linux/skbuff.h | 4 ++--
 net/core/devmem.c      | 6 +++---
 net/ipv4/tcp.c         | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index ff90281ddf90..86737076101d 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3778,8 +3778,8 @@ static inline dma_addr_t __skb_frag_dma_map(struct device *dev,
 					    enum dma_data_direction dir)
 {
 	if (skb_frag_is_net_iov(frag)) {
-		return netmem_to_net_iov(frag->netmem)->dma_addr + offset +
-		       frag->offset;
+		return netmem_to_net_iov(frag->netmem)->desc.dma_addr +
+		       offset + frag->offset;
 	}
 	return dma_map_page(dev, skb_frag_page(frag),
 			    skb_frag_off(frag) + offset, size, dir);
diff --git a/net/core/devmem.c b/net/core/devmem.c
index 1d04754bc756..ec4217d6c0b4 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -97,9 +97,9 @@ net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding)
 	index = offset / PAGE_SIZE;
 	niov = &owner->area.niovs[index];
 
-	niov->pp_magic = 0;
-	niov->pp = NULL;
-	atomic_long_set(&niov->pp_ref_count, 0);
+	niov->desc.pp_magic = 0;
+	niov->desc.pp = NULL;
+	atomic_long_set(&niov->desc.pp_ref_count, 0);
 
 	return niov;
 }
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index dee578aad690..f035440c475a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2587,7 +2587,7 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb,
 				if (err)
 					goto out;
 
-				atomic_long_inc(&niov->pp_ref_count);
+				atomic_long_inc(&niov->desc.pp_ref_count);
 				tcp_xa_pool.netmems[tcp_xa_pool.idx++] = skb_frag_netmem(frag);
 
 				sent += copy;
-- 
2.17.1