If driver doesn't support ring parameter or tcp-data-split configuration
is not sufficient, the devmem should not be set up.
Before setup the devmem, tcp-data-split should be ON and
tcp-data-split-thresh value should be 0.
Signed-off-by: Taehee Yoo <ap420073@xxxxxxxxx>
---
v3:
- Patch added.
net/core/devmem.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/net/core/devmem.c b/net/core/devmem.c
index 11b91c12ee11..a9e9b15028e0 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -8,6 +8,8 @@
*/
#include <linux/dma-buf.h>
+#include <linux/ethtool.h>
+#include <linux/ethtool_netlink.h>
#include <linux/genalloc.h>
#include <linux/mm.h>
#include <linux/netdevice.h>
@@ -131,6 +133,8 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx,
struct net_devmem_dmabuf_binding *binding,
struct netlink_ext_ack *extack)
{
+ struct kernel_ethtool_ringparam kernel_ringparam = {};
+ struct ethtool_ringparam ringparam = {};
struct netdev_rx_queue *rxq;
u32 xa_idx;
int err;
@@ -146,6 +150,20 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx,
return -EEXIST;
}
+ if (!dev->ethtool_ops->get_ringparam) {
+ NL_SET_ERR_MSG(extack, "can't get ringparam");
+ return -EINVAL;
+ }
+
+ dev->ethtool_ops->get_ringparam(dev, &ringparam,
+ &kernel_ringparam, extack);
+ if (kernel_ringparam.tcp_data_split != ETHTOOL_TCP_DATA_SPLIT_ENABLED ||
+ kernel_ringparam.tcp_data_split_thresh) {
+ NL_SET_ERR_MSG(extack,
+ "tcp-header-data-split is disabled or threshold is not zero");
+ return -EINVAL;
+ }
+
#ifdef CONFIG_XDP_SOCKETS
if (rxq->pool) {
NL_SET_ERR_MSG(extack, "designated queue already in use by AF_XDP");
--
2.34.1
