netdev - [PATCH net-next v4 02/10] netdevice: add priv_flags IFF_NOT_USE_DMA

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Date:   Tue, 13 Apr 2021 11:15:15 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     netdev@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org,
        "dust . li" <dust.li@...ux.alibaba.com>
Subject: [PATCH net-next v4 02/10] netdevice: add priv_flags IFF_NOT_USE_DMA_ADDR

Some driver devices, such as virtio-net, do not directly use dma addr.
For upper-level frameworks such as xdp socket, that need to be aware of
this. So add a new priv_flag IFF_NOT_USE_DMA_ADDR.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 include/linux/netdevice.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 86e4bd08c2f1..78b2a8b2c31d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1598,6 +1598,7 @@ typedef u64 netdev_priv_flags_t;
  * @IFF_LIVE_RENAME_OK: rename is allowed while device is up and running
  * @IFF_TX_SKB_NO_LINEAR: device/driver is capable of xmitting frames with
  *	skb_headlen(skb) == 0 (data starts from frag0)
+ * @IFF_NOT_USE_DMA_ADDR: driver not use dma addr directly. such as virtio-net
  */
 enum netdev_priv_flags {
 	IFF_802_1Q_VLAN_BIT,
@@ -1632,6 +1633,7 @@ enum netdev_priv_flags {
 	IFF_L3MDEV_RX_HANDLER_BIT,
 	IFF_LIVE_RENAME_OK_BIT,
 	IFF_TX_SKB_NO_LINEAR_BIT,
+	IFF_NOT_USE_DMA_ADDR_BIT,
 };
 
 #define __IFF_BIT(bit)		((netdev_priv_flags_t)1 << (bit))
@@ -1669,6 +1671,7 @@ enum netdev_priv_flags {
 #define IFF_L3MDEV_RX_HANDLER		__IFF(L3MDEV_RX_HANDLER)
 #define IFF_LIVE_RENAME_OK		__IFF(LIVE_RENAME_OK)
 #define IFF_TX_SKB_NO_LINEAR		__IFF(TX_SKB_NO_LINEAR)
+#define IFF_NOT_USE_DMA_ADDR		__IFF(NOT_USE_DMA_ADDR)
 
 /* Specifies the type of the struct net_device::ml_priv pointer */
 enum netdev_ml_priv_type {
-- 
2.31.0