[PATCH net-next v8 4/9] net: pass queue rx page size from memory provider

Pavel Begunkov
2026-01-09T11:29:07Z

Allow memory providers to configure rx queues with a custom receive
page size. It's passed in struct pp_memory_provider_params, which is
copied into the queue, so it's preserved across queue restarts. Then,
it's propagated to the driver in a new queue config parameter.

Drivers should explicitly opt into using it by setting
QCFG_RX_PAGE_SIZE, in which case they should implement ndo_default_qcfg,
validate the size on queue restart and honour the current config in case
of a reset.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
include/net/netdev_queues.h | 10 ++++++++++
include/net/page_pool/types.h | 1 +
net/core/netdev_rx_queue.c | 9 +++++++++
3 files changed, 20 insertions(+)

diff --git a/include/net/netdev_queues.h b/include/net/netdev_queues.h
index f6f1f71a24e1..feca25131930 100644
--- a/include/net/netdev_queues.h
+++ b/include/net/netdev_queues.h
@@ -15,6 +15,7 @@ struct netdev_config {
};

struct netdev_queue_config {
+ u32 rx_page_size;
};

/* See the netdev.yaml spec for definition of each statistic */
@@ -114,6 +115,11 @@ void netdev_stat_queue_sum(struct net_device *netdev,
int tx_start, int tx_end,
struct netdev_queue_stats_tx *tx_sum);

+enum {
+ /* The queue checks and honours the page size qcfg parameter */
+ QCFG_RX_PAGE_SIZE = 0x1,
+};
+
/**
* struct netdev_queue_mgmt_ops - netdev ops for queue management
*
@@ -135,6 +141,8 @@ void netdev_stat_queue_sum(struct net_device *netdev,
*
* @ndo_default_qcfg: Populate queue config struct with defaults. Optional.
*
+ * @supported_params: Bitmask of supported parameters, see QCFG_*.
+ *
* Note that @ndo_queue_mem_alloc and @ndo_queue_mem_free may be called while
* the interface is closed. @ndo_queue_start and @ndo_queue_stop will only
* be called for an interface which is open.
@@ -158,6 +166,8 @@ struct netdev_queue_mgmt_ops {
struct netdev_queue_config *qcfg);
struct device * (*ndo_queue_get_dma_dev)(struct net_device *dev,
int idx);
+
+ unsigned int supported_params;
};

bool netif_rxq_has_unreadable_mp(struct net_device *dev, int idx);
diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index 1509a536cb85..0d453484a585 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -161,6 +161,7 @@ struct memory_provider_ops;
struct pp_memory_provider_params {
void *mp_priv;
const struct memory_provider_ops *mp_ops;
+ u32 rx_page_size;
};

struct page_pool {
diff --git a/net/core/netdev_rx_queue.c b/net/core/netdev_rx_queue.c
index 86d1c0a925e3..b81cad90ba2f 100644
--- a/net/core/netdev_rx_queue.c
+++ b/net/core/netdev_rx_queue.c
@@ -30,12 +30,21 @@ int netdev_rx_queue_restart(struct net_device *dev, unsigned int rxq_idx)
!qops->ndo_queue_mem_alloc || !qops->ndo_queue_start)
return -EOPNOTSUPP;

+ if (WARN_ON_ONCE(qops->supported_params && !qops->ndo_default_qcfg))
+ return -EINVAL;
+
netdev_assert_locked(dev);

memset(&qcfg, 0, sizeof(qcfg));
if (qops->ndo_default_qcfg)
qops->ndo_default_qcfg(dev, &qcfg);

+ if (rxq->mp_params.rx_page_size) {
+ if (!(qops->supported_params & QCFG_RX_PAGE_SIZE))
+ return -EOPNOTSUPP;
+ qcfg.rx_page_size = rxq->mp_params.rx_page_size;
+ }
+
new_mem = kvzalloc(qops->ndo_queue_mem_size, GFP_KERNEL);
if (!new_mem)
return -ENOMEM;
--
2.52.0