This patch implement the logic of bind/unbind xsk pool to sq and rq.

Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
 drivers/net/virtio/Makefile     |   2 +-
 drivers/net/virtio/main.c       |  11 +-
 drivers/net/virtio/virtio_net.h |  17 +++
 drivers/net/virtio/xsk.c        | 187 ++++++++++++++++++++++++++++++++
 drivers/net/virtio/xsk.h        |   7 ++
 5 files changed, 217 insertions(+), 7 deletions(-)
 create mode 100644 drivers/net/virtio/xsk.c
 create mode 100644 drivers/net/virtio/xsk.h

diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
index 15ed7c97fd4f..8c2a884d2dba 100644
--- a/drivers/net/virtio/Makefile
+++ b/drivers/net/virtio/Makefile
@@ -5,4 +5,4 @@
 
 obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
 
-virtio_net-y := main.o
+virtio_net-y := main.o xsk.o
diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index 8b121de25f41..2b11a94c8d5a 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -8,7 +8,6 @@
 #include <linux/etherdevice.h>
 #include <linux/module.h>
 #include <linux/virtio.h>
-#include <linux/virtio_net.h>
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
 #include <linux/scatterlist.h>
@@ -23,6 +22,7 @@
 #include <net/netdev_rx_queue.h>
 
 #include "virtio_net.h"
+#include "xsk.h"
 
 static int napi_weight = NAPI_POLL_WEIGHT;
 module_param(napi_weight, int, 0444);
@@ -149,9 +149,6 @@ struct virtio_net_common_hdr {
        };
 };
 
-static void virtnet_rq_free_unused_bufs(struct virtqueue *vq);
-static void virtnet_sq_free_unused_bufs(struct virtqueue *vq);
-
 static bool is_xdp_frame(void *ptr)
 {
        return (unsigned long)ptr & VIRTIO_XDP_FLAG;
@@ -3756,6 +3753,8 @@ static int virtnet_xdp(struct net_device *dev, struct 
netdev_bpf *xdp)
        switch (xdp->command) {
        case XDP_SETUP_PROG:
                return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
+       case XDP_SETUP_XSK_POOL:
+               return virtnet_xsk_pool_setup(dev, xdp);
        default:
                return -EINVAL;
        }
@@ -3939,7 +3938,7 @@ static void free_receive_page_frags(struct virtnet_info 
*vi)
                }
 }
 
-static void virtnet_sq_free_unused_bufs(struct virtqueue *vq)
+void virtnet_sq_free_unused_bufs(struct virtqueue *vq)
 {
        struct virtnet_info *vi = vq->vdev->priv;
        struct virtio_dma_head *dma;
@@ -3967,7 +3966,7 @@ static void virtnet_sq_free_unused_bufs(struct virtqueue 
*vq)
        }
 }
 
-static void virtnet_rq_free_unused_bufs(struct virtqueue *vq)
+void virtnet_rq_free_unused_bufs(struct virtqueue *vq)
 {
        struct virtnet_info *vi = vq->vdev->priv;
        struct virtnet_rq *rq;
diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index 5f3dcd37fd0f..1adebcb2a6cc 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -5,6 +5,8 @@
 
 #include <linux/ethtool.h>
 #include <linux/average.h>
+#include <linux/virtio_net.h>
+#include <net/xdp_sock_drv.h>
 
 /* RX packet size EWMA. The average packet size is used to determine the packet
  * buffer size when refilling RX rings. As the entire RX ring may be refilled
@@ -75,6 +77,12 @@ struct virtnet_sq {
 
        /* Record whether sq is in reset state. */
        bool reset;
+
+       struct {
+               struct xsk_buff_pool *pool;
+
+               dma_addr_t hdr_dma_address;
+       } xsk;
 };
 
 /* Internal representation of a receive virtqueue */
@@ -112,6 +120,13 @@ struct virtnet_rq {
 
        /* Record the last dma info to free after new pages is allocated. */
        struct virtnet_rq_dma *last_dma;
+
+       struct {
+               struct xsk_buff_pool *pool;
+
+               /* xdp rxq used by xsk */
+               struct xdp_rxq_info xdp_rxq;
+       } xsk;
 };
 
 struct virtnet_info {
@@ -200,4 +215,6 @@ void virtnet_rx_pause(struct virtnet_info *vi, struct 
virtnet_rq *rq);
 void virtnet_rx_resume(struct virtnet_info *vi, struct virtnet_rq *rq);
 void virtnet_tx_pause(struct virtnet_info *vi, struct virtnet_sq *sq);
 void virtnet_tx_resume(struct virtnet_info *vi, struct virtnet_sq *sq);
+void virtnet_sq_free_unused_bufs(struct virtqueue *vq);
+void virtnet_rq_free_unused_bufs(struct virtqueue *vq);
 #endif
diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
new file mode 100644
index 000000000000..68fa1c422b41
--- /dev/null
+++ b/drivers/net/virtio/xsk.c
@@ -0,0 +1,187 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * virtio-net xsk
+ */
+
+#include "virtio_net.h"
+
+static struct virtio_net_hdr_mrg_rxbuf xsk_hdr;
+
+static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct virtnet_rq 
*rq,
+                                   struct xsk_buff_pool *pool)
+{
+       int err, qindex;
+
+       qindex = rq - vi->rq;
+
+       if (pool) {
+               err = xdp_rxq_info_reg(&rq->xsk.xdp_rxq, vi->dev, qindex, 
rq->napi.napi_id);
+               if (err < 0)
+                       return err;
+
+               err = xdp_rxq_info_reg_mem_model(&rq->xsk.xdp_rxq,
+                                                MEM_TYPE_XSK_BUFF_POOL, NULL);
+               if (err < 0) {
+                       xdp_rxq_info_unreg(&rq->xsk.xdp_rxq);
+                       return err;
+               }
+
+               xsk_pool_set_rxq_info(pool, &rq->xsk.xdp_rxq);
+       }
+
+       virtnet_rx_pause(vi, rq);
+
+       err = virtqueue_reset(rq->vq, virtnet_rq_free_unused_bufs);
+       if (err) {
+               netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: 
%d\n", qindex, err);
+
+               pool = NULL;
+       }
+
+       if (!pool)
+               xdp_rxq_info_unreg(&rq->xsk.xdp_rxq);
+
+       rq->xsk.pool = pool;
+
+       virtnet_rx_resume(vi, rq);
+
+       return err;
+}
+
+static int virtnet_sq_bind_xsk_pool(struct virtnet_info *vi,
+                                   struct virtnet_sq *sq,
+                                   struct xsk_buff_pool *pool)
+{
+       int err, qindex;
+
+       qindex = sq - vi->sq;
+
+       virtnet_tx_pause(vi, sq);
+
+       err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_bufs);
+       if (err) {
+               pool = NULL;
+               netdev_err(vi->dev, "reset tx fail: tx queue index: %d err: 
%d\n", qindex, err);
+       }
+
+       sq->xsk.pool = pool;
+
+       virtnet_tx_resume(vi, sq);
+
+       return err;
+}
+
+static int virtnet_xsk_pool_enable(struct net_device *dev,
+                                  struct xsk_buff_pool *pool,
+                                  u16 qid)
+{
+       struct virtnet_info *vi = netdev_priv(dev);
+       struct virtnet_rq *rq;
+       struct virtnet_sq *sq;
+       struct device *dma_dev;
+       dma_addr_t hdr_dma;
+       int err;
+
+       /* In big_packets mode, xdp cannot work, so there is no need to
+        * initialize xsk of rq.
+        */
+       if (vi->big_packets && !vi->mergeable_rx_bufs)
+               return -ENOENT;
+
+       if (qid >= vi->curr_queue_pairs)
+               return -EINVAL;
+
+       sq = &vi->sq[qid];
+       rq = &vi->rq[qid];
+
+       /* xsk tx zerocopy depend on the tx napi.
+        *
+        * All xsk packets are actually consumed and sent out from the xsk tx
+        * queue under the tx napi mechanism.
+        */
+       if (!sq->napi.weight)
+               return -EPERM;
+
+       if (!virtqueue_get_dma_premapped(rq->vq) || 
!virtqueue_get_dma_premapped(sq->vq))
+               return -EPERM;
+
+       /* For the xsk, the tx and rx should have the same device. But
+        * vq->dma_dev allows every vq has the respective dma dev. So I check
+        * the dma dev of vq and sq is the same dev.
+        */
+       if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq))
+               return -EPERM;
+
+       dma_dev = virtqueue_dma_dev(rq->vq);
+       if (!dma_dev)
+               return -EPERM;
+
+       hdr_dma = dma_map_single(dma_dev, &xsk_hdr, vi->hdr_len, DMA_TO_DEVICE);
+       if (dma_mapping_error(dma_dev, hdr_dma))
+               return -ENOMEM;
+
+       err = xsk_pool_dma_map(pool, dma_dev, 0);
+       if (err)
+               goto err_xsk_map;
+
+       err = virtnet_rq_bind_xsk_pool(vi, rq, pool);
+       if (err)
+               goto err_rq;
+
+       err = virtnet_sq_bind_xsk_pool(vi, sq, pool);
+       if (err)
+               goto err_sq;
+
+       /* Now, we do not support tx offset, so all the tx virtnet hdr is zero.
+        * So all the tx packets can share a single hdr.
+        */
+       sq->xsk.hdr_dma_address = hdr_dma;
+
+       return 0;
+
+err_sq:
+       virtnet_rq_bind_xsk_pool(vi, rq, NULL);
+err_rq:
+       xsk_pool_dma_unmap(pool, 0);
+err_xsk_map:
+       dma_unmap_single(dma_dev, hdr_dma, vi->hdr_len, DMA_TO_DEVICE);
+       return err;
+}
+
+static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
+{
+       struct virtnet_info *vi = netdev_priv(dev);
+       struct xsk_buff_pool *pool;
+       struct device *dma_dev;
+       struct virtnet_rq *rq;
+       struct virtnet_sq *sq;
+       int err1, err2;
+
+       if (qid >= vi->curr_queue_pairs)
+               return -EINVAL;
+
+       sq = &vi->sq[qid];
+       rq = &vi->rq[qid];
+
+       pool = sq->xsk.pool;
+
+       err1 = virtnet_sq_bind_xsk_pool(vi, sq, NULL);
+       err2 = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
+
+       xsk_pool_dma_unmap(pool, 0);
+
+       dma_dev = virtqueue_dma_dev(rq->vq);
+
+       dma_unmap_single(dma_dev, sq->xsk.hdr_dma_address, vi->hdr_len, 
DMA_TO_DEVICE);
+
+       return err1 | err2;
+}
+
+int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp)
+{
+       if (xdp->xsk.pool)
+               return virtnet_xsk_pool_enable(dev, xdp->xsk.pool,
+                                              xdp->xsk.queue_id);
+       else
+               return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id);
+}
diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
new file mode 100644
index 000000000000..1918285c310c
--- /dev/null
+++ b/drivers/net/virtio/xsk.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __XSK_H__
+#define __XSK_H__
+
+int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp);
+#endif
-- 
2.32.0.3.g01195cf9f


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