mlx5, xsk: Migrate to new MEM_TYPE_XSK_BUFF_POOL

Use the new MEM_TYPE_XSK_BUFF_POOL API in lieu of MEM_TYPE_ZERO_COPY in
mlx5e. It allows to drop a lot of code from the driver (which is now
common in AF_XDP core and was related to XSK RX frame allocation, DMA
mapping, etc.) and slightly improve performance (RX +0.8 Mpps, TX +0.4
Mpps).

rfc->v1: Put back the sanity check for XSK params, use XSK API to get
         the total headroom size. (Maxim)

v1->v2: Fix DMA address handling, set XDP metadata to invalid. (Maxim)

v2->v3: Handle frame_sz, use xsk_buff_xdp_get_frame_dma, use xsk_buff
        API for DMA sync on TX, add performance numbers. (Maxim)

v3->v4: Remove unused variable num_xsk_frames. (Jakub)
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200520192103.355233-12-bjorn.topel@gmail.com

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -407,10 +407,7 @@ struct mlx5e_dma_info {
 	dma_addr_t addr;
 	union {
 		struct page *page;
-		struct {
-			u64 handle;
-			void *data;
-		} xsk;
+		struct xdp_buff *xsk;
 	};
 };
 
@@ -623,7 +620,6 @@ struct mlx5e_rq {
 		} mpwqe;
 	};
 	struct {
-		u16            umem_headroom;
 		u16            headroom;
 		u32            frame0_sz;
 		u8             map_dir;   /* dma map direction */
@@ -656,7 +652,6 @@ struct mlx5e_rq {
 	struct page_pool      *page_pool;
 
 	/* AF_XDP zero-copy */
-	struct zero_copy_allocator zca;
 	struct xdp_umem       *umem;
 
 	struct work_struct     recover_work;

drivers/net/ethernet/mellanox/mlx5/core/en/params.c

@@ -12,15 +12,16 @@ static inline bool mlx5e_rx_is_xdp(struct mlx5e_params *params,
 u16 mlx5e_get_linear_rq_headroom(struct mlx5e_params *params,
 				 struct mlx5e_xsk_param *xsk)
 {
-	u16 headroom = NET_IP_ALIGN;
+	u16 headroom;
 
-	if (mlx5e_rx_is_xdp(params, xsk)) {
-		headroom += XDP_PACKET_HEADROOM;
 	if (xsk)
-			headroom += xsk->headroom;
-	} else {
+		return xsk->headroom;
+
+	headroom = NET_IP_ALIGN;
+	if (mlx5e_rx_is_xdp(params, xsk))
+		headroom += XDP_PACKET_HEADROOM;
+	else
 		headroom += MLX5_RX_HEADROOM;
-	}
 
 	return headroom;
 }

drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c

@@ -71,7 +71,7 @@ mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
 	xdptxd.data = xdpf->data;
 	xdptxd.len  = xdpf->len;
 
-	if (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) {
+	if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) {
 		/* The xdp_buff was in the UMEM and was copied into a newly
 		 * allocated page. The UMEM page was returned via the ZCA, and
 		 * this new page has to be mapped at this point and has to be
@@ -119,50 +119,33 @@ mlx5e_xmit_xdp_buff(struct mlx5e_xdpsq *sq, struct mlx5e_rq *rq,
 
 /* returns true if packet was consumed by xdp */
 bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
-		      void *va, u16 *rx_headroom, u32 *len, bool xsk)
+		      u32 *len, struct xdp_buff *xdp)
 {
 	struct bpf_prog *prog = READ_ONCE(rq->xdp_prog);
-	struct xdp_umem *umem = rq->umem;
-	struct xdp_buff xdp;
 	u32 act;
 	int err;
 
 	if (!prog)
 		return false;
 
-	xdp.data = va + *rx_headroom;
-	xdp_set_data_meta_invalid(&xdp);
-	xdp.data_end = xdp.data + *len;
-	xdp.data_hard_start = va;
-	if (xsk)
-		xdp.handle = di->xsk.handle;
-	xdp.rxq = &rq->xdp_rxq;
-	xdp.frame_sz = rq->buff.frame0_sz;
-
-	act = bpf_prog_run_xdp(prog, &xdp);
-	if (xsk) {
-		u64 off = xdp.data - xdp.data_hard_start;
-
-		xdp.handle = xsk_umem_adjust_offset(umem, xdp.handle, off);
-	}
+	act = bpf_prog_run_xdp(prog, xdp);
 	switch (act) {
 	case XDP_PASS:
-		*rx_headroom = xdp.data - xdp.data_hard_start;
-		*len = xdp.data_end - xdp.data;
+		*len = xdp->data_end - xdp->data;
 		return false;
 	case XDP_TX:
-		if (unlikely(!mlx5e_xmit_xdp_buff(rq->xdpsq, rq, di, &xdp)))
+		if (unlikely(!mlx5e_xmit_xdp_buff(rq->xdpsq, rq, di, xdp)))
 			goto xdp_abort;
 		__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags); /* non-atomic */
 		return true;
 	case XDP_REDIRECT:
 		/* When XDP enabled then page-refcnt==1 here */
-		err = xdp_do_redirect(rq->netdev, &xdp, prog);
+		err = xdp_do_redirect(rq->netdev, xdp, prog);
 		if (unlikely(err))
 			goto xdp_abort;
 		__set_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags);
 		__set_bit(MLX5E_RQ_FLAG_XDP_REDIRECT, rq->flags);
-		if (!xsk)
+		if (xdp->rxq->mem.type != MEM_TYPE_XSK_BUFF_POOL)
 			mlx5e_page_dma_unmap(rq, di);
 		rq->stats->xdp_redirect++;
 		return true;

drivers/net/ethernet/mellanox/mlx5/core/en/xdp.h

@@ -63,7 +63,7 @@
 struct mlx5e_xsk_param;
 int mlx5e_xdp_max_mtu(struct mlx5e_params *params, struct mlx5e_xsk_param *xsk);
 bool mlx5e_xdp_handle(struct mlx5e_rq *rq, struct mlx5e_dma_info *di,
-		      void *va, u16 *rx_headroom, u32 *len, bool xsk);
+		      u32 *len, struct xdp_buff *xdp);
 void mlx5e_xdp_mpwqe_complete(struct mlx5e_xdpsq *sq);
 bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq);
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq);

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.c

@@ -3,71 +3,10 @@
 
 #include "rx.h"
 #include "en/xdp.h"
-#include <net/xdp_sock.h>
+#include <net/xdp_sock_drv.h>
 
 /* RX data path */
 
-bool mlx5e_xsk_pages_enough_umem(struct mlx5e_rq *rq, int count)
-{
-	/* Check in advance that we have enough frames, instead of allocating
-	 * one-by-one, failing and moving frames to the Reuse Ring.
-	 */
-	return xsk_umem_has_addrs_rq(rq->umem, count);
-}
-
-int mlx5e_xsk_page_alloc_umem(struct mlx5e_rq *rq,
-			      struct mlx5e_dma_info *dma_info)
-{
-	struct xdp_umem *umem = rq->umem;
-	u64 handle;
-
-	if (!xsk_umem_peek_addr_rq(umem, &handle))
-		return -ENOMEM;
-
-	dma_info->xsk.handle = xsk_umem_adjust_offset(umem, handle,
-						      rq->buff.umem_headroom);
-	dma_info->xsk.data = xdp_umem_get_data(umem, dma_info->xsk.handle);
-
-	/* No need to add headroom to the DMA address. In striding RQ case, we
-	 * just provide pages for UMR, and headroom is counted at the setup
-	 * stage when creating a WQE. In non-striding RQ case, headroom is
-	 * accounted in mlx5e_alloc_rx_wqe.
-	 */
-	dma_info->addr = xdp_umem_get_dma(umem, handle);
-
-	xsk_umem_release_addr_rq(umem);
-
-	dma_sync_single_for_device(rq->pdev, dma_info->addr, PAGE_SIZE,
-				   DMA_BIDIRECTIONAL);
-
-	return 0;
-}
-
-static inline void mlx5e_xsk_recycle_frame(struct mlx5e_rq *rq, u64 handle)
-{
-	xsk_umem_fq_reuse(rq->umem, handle & rq->umem->chunk_mask);
-}
-
-/* XSKRQ uses pages from UMEM, they must not be released. They are returned to
- * the userspace if possible, and if not, this function is called to reuse them
- * in the driver.
- */
-void mlx5e_xsk_page_release(struct mlx5e_rq *rq,
-			    struct mlx5e_dma_info *dma_info)
-{
-	mlx5e_xsk_recycle_frame(rq, dma_info->xsk.handle);
-}
-
-/* Return a frame back to the hardware to fill in again. It is used by XDP when
- * the XDP program returns XDP_TX or XDP_REDIRECT not to an XSKMAP.
- */
-void mlx5e_xsk_zca_free(struct zero_copy_allocator *zca, unsigned long handle)
-{
-	struct mlx5e_rq *rq = container_of(zca, struct mlx5e_rq, zca);
-
-	mlx5e_xsk_recycle_frame(rq, handle);
-}
-
 static struct sk_buff *mlx5e_xsk_construct_skb(struct mlx5e_rq *rq, void *data,
 					       u32 cqe_bcnt)
 {
@@ -90,11 +29,8 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
 						    u32 head_offset,
 						    u32 page_idx)
 {
-	struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx];
-	u16 rx_headroom = rq->buff.headroom - rq->buff.umem_headroom;
+	struct xdp_buff *xdp = wi->umr.dma_info[page_idx].xsk;
 	u32 cqe_bcnt32 = cqe_bcnt;
-	void *va, *data;
-	u32 frag_size;
 	bool consumed;
 
 	/* Check packet size. Note LRO doesn't use linear SKB */
@@ -103,22 +39,20 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
 		return NULL;
 	}
 
-	/* head_offset is not used in this function, because di->xsk.data and
-	 * di->addr point directly to the necessary place. Furthermore, in the
-	 * current implementation, UMR pages are mapped to XSK frames, so
+	/* head_offset is not used in this function, because xdp->data and the
+	 * DMA address point directly to the necessary place. Furthermore, in
+	 * the current implementation, UMR pages are mapped to XSK frames, so
 	 * head_offset should always be 0.
 	 */
 	WARN_ON_ONCE(head_offset);
 
-	va             = di->xsk.data;
-	data           = va + rx_headroom;
-	frag_size      = rq->buff.headroom + cqe_bcnt32;
-
-	dma_sync_single_for_cpu(rq->pdev, di->addr, frag_size, DMA_BIDIRECTIONAL);
-	prefetch(data);
+	xdp->data_end = xdp->data + cqe_bcnt32;
+	xdp_set_data_meta_invalid(xdp);
+	xsk_buff_dma_sync_for_cpu(xdp);
+	prefetch(xdp->data);
 
 	rcu_read_lock();
-	consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt32, true);
+	consumed = mlx5e_xdp_handle(rq, NULL, &cqe_bcnt32, xdp);
 	rcu_read_unlock();
 
 	/* Possible flows:
@@ -145,7 +79,7 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
 	/* XDP_PASS: copy the data from the UMEM to a new SKB and reuse the
 	 * frame. On SKB allocation failure, NULL is returned.
 	 */
-	return mlx5e_xsk_construct_skb(rq, data, cqe_bcnt32);
+	return mlx5e_xsk_construct_skb(rq, xdp->data, cqe_bcnt32);
 }
 
 struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
@@ -153,25 +87,20 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
 					      struct mlx5e_wqe_frag_info *wi,
 					      u32 cqe_bcnt)
 {
-	struct mlx5e_dma_info *di = wi->di;
-	u16 rx_headroom = rq->buff.headroom - rq->buff.umem_headroom;
-	void *va, *data;
+	struct xdp_buff *xdp = wi->di->xsk;
 	bool consumed;
-	u32 frag_size;
 
-	/* wi->offset is not used in this function, because di->xsk.data and
-	 * di->addr point directly to the necessary place. Furthermore, in the
-	 * current implementation, one page = one packet = one frame, so
+	/* wi->offset is not used in this function, because xdp->data and the
+	 * DMA address point directly to the necessary place. Furthermore, the
+	 * XSK allocator allocates frames per packet, instead of pages, so
 	 * wi->offset should always be 0.
 	 */
 	WARN_ON_ONCE(wi->offset);
 
-	va             = di->xsk.data;
-	data           = va + rx_headroom;
-	frag_size      = rq->buff.headroom + cqe_bcnt;
-
-	dma_sync_single_for_cpu(rq->pdev, di->addr, frag_size, DMA_BIDIRECTIONAL);
-	prefetch(data);
+	xdp->data_end = xdp->data + cqe_bcnt;
+	xdp_set_data_meta_invalid(xdp);
+	xsk_buff_dma_sync_for_cpu(xdp);
+	prefetch(xdp->data);
 
 	if (unlikely(get_cqe_opcode(cqe) != MLX5_CQE_RESP_SEND)) {
 		rq->stats->wqe_err++;
@@ -179,7 +108,7 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
 	}
 
 	rcu_read_lock();
-	consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt, true);
+	consumed = mlx5e_xdp_handle(rq, NULL, &cqe_bcnt, xdp);
 	rcu_read_unlock();
 
 	if (likely(consumed))
@@ -189,5 +118,5 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
 	 * will be handled by mlx5e_put_rx_frag.
 	 * On SKB allocation failure, NULL is returned.
 	 */
-	return mlx5e_xsk_construct_skb(rq, data, cqe_bcnt);
+	return mlx5e_xsk_construct_skb(rq, xdp->data, cqe_bcnt);
 }

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/rx.h

@@ -9,12 +9,6 @@
 
 /* RX data path */
 
-bool mlx5e_xsk_pages_enough_umem(struct mlx5e_rq *rq, int count);
-int mlx5e_xsk_page_alloc_umem(struct mlx5e_rq *rq,
-			      struct mlx5e_dma_info *dma_info);
-void mlx5e_xsk_page_release(struct mlx5e_rq *rq,
-			    struct mlx5e_dma_info *dma_info);
-void mlx5e_xsk_zca_free(struct zero_copy_allocator *zca, unsigned long handle);
 struct sk_buff *mlx5e_xsk_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq,
 						    struct mlx5e_mpw_info *wi,
 						    u16 cqe_bcnt,
@@ -25,6 +19,23 @@ struct sk_buff *mlx5e_xsk_skb_from_cqe_linear(struct mlx5e_rq *rq,
 					      struct mlx5e_wqe_frag_info *wi,
 					      u32 cqe_bcnt);
 
+static inline int mlx5e_xsk_page_alloc_umem(struct mlx5e_rq *rq,
+					    struct mlx5e_dma_info *dma_info)
+{
+	dma_info->xsk = xsk_buff_alloc(rq->umem);
+	if (!dma_info->xsk)
+		return -ENOMEM;
+
+	/* Store the DMA address without headroom. In striding RQ case, we just
+	 * provide pages for UMR, and headroom is counted at the setup stage
+	 * when creating a WQE. In non-striding RQ case, headroom is accounted
+	 * in mlx5e_alloc_rx_wqe.
+	 */
+	dma_info->addr = xsk_buff_xdp_get_frame_dma(dma_info->xsk);
+
+	return 0;
+}
+
 static inline bool mlx5e_xsk_update_rx_wakeup(struct mlx5e_rq *rq, bool alloc_err)
 {
 	if (!xsk_umem_uses_need_wakeup(rq->umem))

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c

@@ -5,7 +5,7 @@
 #include "umem.h"
 #include "en/xdp.h"
 #include "en/params.h"
-#include <net/xdp_sock.h>
+#include <net/xdp_sock_drv.h>
 
 int mlx5e_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags)
 {
@@ -92,12 +92,11 @@ bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget)
 			break;
 		}
 
-		xdptxd.dma_addr = xdp_umem_get_dma(umem, desc.addr);
-		xdptxd.data = xdp_umem_get_data(umem, desc.addr);
+		xdptxd.dma_addr = xsk_buff_raw_get_dma(umem, desc.addr);
+		xdptxd.data = xsk_buff_raw_get_data(umem, desc.addr);
 		xdptxd.len = desc.len;
 
-		dma_sync_single_for_device(sq->pdev, xdptxd.dma_addr,
-					   xdptxd.len, DMA_BIDIRECTIONAL);
+		xsk_buff_raw_dma_sync_for_device(umem, xdptxd.dma_addr, xdptxd.len);
 
 		if (unlikely(!sq->xmit_xdp_frame(sq, &xdptxd, &xdpi, check_result))) {
 			if (sq->mpwqe.wqe)

drivers/net/ethernet/mellanox/mlx5/core/en/xsk/umem.c

@@ -10,40 +10,14 @@ static int mlx5e_xsk_map_umem(struct mlx5e_priv *priv,
 			      struct xdp_umem *umem)
 {
 	struct device *dev = priv->mdev->device;
-	u32 i;
 
-	for (i = 0; i < umem->npgs; i++) {
-		dma_addr_t dma = dma_map_page(dev, umem->pgs[i], 0, PAGE_SIZE,
-					      DMA_BIDIRECTIONAL);
-
-		if (unlikely(dma_mapping_error(dev, dma)))
-			goto err_unmap;
-		umem->pages[i].dma = dma;
-	}
-
-	return 0;
-
-err_unmap:
-	while (i--) {
-		dma_unmap_page(dev, umem->pages[i].dma, PAGE_SIZE,
-			       DMA_BIDIRECTIONAL);
-		umem->pages[i].dma = 0;
-	}
-
-	return -ENOMEM;
+	return xsk_buff_dma_map(umem, dev, 0);
 }
 
 static void mlx5e_xsk_unmap_umem(struct mlx5e_priv *priv,
 				 struct xdp_umem *umem)
 {
-	struct device *dev = priv->mdev->device;
-	u32 i;
-
-	for (i = 0; i < umem->npgs; i++) {
-		dma_unmap_page(dev, umem->pages[i].dma, PAGE_SIZE,
-			       DMA_BIDIRECTIONAL);
-		umem->pages[i].dma = 0;
-	}
+	return xsk_buff_dma_unmap(umem, 0);
 }
 
 static int mlx5e_xsk_get_umems(struct mlx5e_xsk *xsk)
@@ -90,13 +64,14 @@ static void mlx5e_xsk_remove_umem(struct mlx5e_xsk *xsk, u16 ix)
 
 static bool mlx5e_xsk_is_umem_sane(struct xdp_umem *umem)
 {
-	return umem->headroom <= 0xffff && umem->chunk_size_nohr <= 0xffff;
+	return xsk_umem_get_headroom(umem) <= 0xffff &&
+		xsk_umem_get_chunk_size(umem) <= 0xffff;
 }
 
 void mlx5e_build_xsk_param(struct xdp_umem *umem, struct mlx5e_xsk_param *xsk)
 {
-	xsk->headroom = umem->headroom;
-	xsk->chunk_size = umem->chunk_size_nohr + umem->headroom;
+	xsk->headroom = xsk_umem_get_headroom(umem);
+	xsk->chunk_size = xsk_umem_get_chunk_size(umem);
 }
 
 static int mlx5e_xsk_enable_locked(struct mlx5e_priv *priv,
@@ -241,18 +216,6 @@ int mlx5e_xsk_setup_umem(struct net_device *dev, struct xdp_umem *umem, u16 qid)
 		      mlx5e_xsk_disable_umem(priv, ix);
 }
 
-int mlx5e_xsk_resize_reuseq(struct xdp_umem *umem, u32 nentries)
-{
-	struct xdp_umem_fq_reuse *reuseq;
-
-	reuseq = xsk_reuseq_prepare(nentries);
-	if (unlikely(!reuseq))
-		return -ENOMEM;
-	xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
-
-	return 0;
-}
-
 u16 mlx5e_xsk_first_unused_channel(struct mlx5e_params *params, struct mlx5e_xsk *xsk)
 {
 	u16 res = xsk->refcnt ? params->num_channels : 0;

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -38,7 +38,7 @@
 #include <linux/bpf.h>
 #include <linux/if_bridge.h>
 #include <net/page_pool.h>
-#include <net/xdp_sock.h>
+#include <net/xdp_sock_drv.h>
 #include "eswitch.h"
 #include "en.h"
 #include "en/txrx.h"
@@ -374,7 +374,6 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
 	struct mlx5_core_dev *mdev = c->mdev;
 	void *rqc = rqp->rqc;
 	void *rqc_wq = MLX5_ADDR_OF(rqc, rqc, wq);
-	u32 num_xsk_frames = 0;
 	u32 rq_xdp_ix;
 	u32 pool_size;
 	int wq_sz;
@@ -414,7 +413,6 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
 
 	rq->buff.map_dir = rq->xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
 	rq->buff.headroom = mlx5e_get_rq_headroom(mdev, params, xsk);
-	rq->buff.umem_headroom = xsk ? xsk->headroom : 0;
 	pool_size = 1 << params->log_rq_mtu_frames;
 
 	switch (rq->wq_type) {
@@ -428,10 +426,6 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
 
 		wq_sz = mlx5_wq_ll_get_size(&rq->mpwqe.wq);
 
-		if (xsk)
-			num_xsk_frames = wq_sz <<
-				mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk);
-
 		pool_size = MLX5_MPWRQ_PAGES_PER_WQE <<
 			mlx5e_mpwqe_get_log_rq_size(params, xsk);
 
@@ -483,9 +477,6 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
 
 		wq_sz = mlx5_wq_cyc_get_size(&rq->wqe.wq);
 
-		if (xsk)
-			num_xsk_frames = wq_sz << rq->wqe.info.log_num_frags;
-
 		rq->wqe.info = rqp->frags_info;
 		rq->buff.frame0_sz = rq->wqe.info.arr[0].frag_stride;
 
@@ -526,19 +517,9 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
 	}
 
 	if (xsk) {
-		rq->buff.frame0_sz = xsk_umem_xdp_frame_sz(umem);
-
-		err = mlx5e_xsk_resize_reuseq(umem, num_xsk_frames);
-		if (unlikely(err)) {
-			mlx5_core_err(mdev, "Unable to allocate the Reuse Ring for %u frames\n",
-				      num_xsk_frames);
-			goto err_free;
-		}
-
-		rq->zca.free = mlx5e_xsk_zca_free;
 		err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
-						 MEM_TYPE_ZERO_COPY,
-						 &rq->zca);
+						 MEM_TYPE_XSK_BUFF_POOL, NULL);
+		xsk_buff_set_rxq_info(rq->umem, &rq->xdp_rxq);
 	} else {
 		/* Create a page_pool and register it with rxq */
 		pp_params.order     = 0;

drivers/net/ethernet/mellanox/mlx5/core/en_rx.c

@@ -300,7 +300,7 @@ static inline void mlx5e_page_release(struct mlx5e_rq *rq,
 		 * put into the Reuse Ring, because there is no way to return
 		 * the page to the userspace when the interface goes down.
 		 */
-		mlx5e_xsk_page_release(rq, dma_info);
+		xsk_buff_free(dma_info->xsk);
 	else
 		mlx5e_page_release_dynamic(rq, dma_info, recycle);
 }
@@ -385,7 +385,11 @@ static int mlx5e_alloc_rx_wqes(struct mlx5e_rq *rq, u16 ix, u8 wqe_bulk)
 	if (rq->umem) {
 		int pages_desired = wqe_bulk << rq->wqe.info.log_num_frags;
 
-		if (unlikely(!mlx5e_xsk_pages_enough_umem(rq, pages_desired)))
+		/* Check in advance that we have enough frames, instead of
+		 * allocating one-by-one, failing and moving frames to the
+		 * Reuse Ring.
+		 */
+		if (unlikely(!xsk_buff_can_alloc(rq->umem, pages_desired)))
 			return -ENOMEM;
 	}
 
@@ -480,8 +484,11 @@ static int mlx5e_alloc_rx_mpwqe(struct mlx5e_rq *rq, u16 ix)
 	int err;
 	int i;
 
+	/* Check in advance that we have enough frames, instead of allocating
+	 * one-by-one, failing and moving frames to the Reuse Ring.
+	 */
 	if (rq->umem &&
-	    unlikely(!mlx5e_xsk_pages_enough_umem(rq, MLX5_MPWRQ_PAGES_PER_WQE))) {
+	    unlikely(!xsk_buff_can_alloc(rq->umem, MLX5_MPWRQ_PAGES_PER_WQE))) {
 		err = -ENOMEM;
 		goto err;
 	}
@@ -1044,12 +1051,24 @@ struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
 	return skb;
 }
 
+static void mlx5e_fill_xdp_buff(struct mlx5e_rq *rq, void *va, u16 headroom,
+				u32 len, struct xdp_buff *xdp)
+{
+	xdp->data_hard_start = va;
+	xdp_set_data_meta_invalid(xdp);
+	xdp->data = va + headroom;
+	xdp->data_end = xdp->data + len;
+	xdp->rxq = &rq->xdp_rxq;
+	xdp->frame_sz = rq->buff.frame0_sz;
+}
+
 struct sk_buff *
 mlx5e_skb_from_cqe_linear(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
 			  struct mlx5e_wqe_frag_info *wi, u32 cqe_bcnt)
 {
 	struct mlx5e_dma_info *di = wi->di;
 	u16 rx_headroom = rq->buff.headroom;
+	struct xdp_buff xdp;
 	struct sk_buff *skb;
 	void *va, *data;
 	bool consumed;
@@ -1065,11 +1084,13 @@ mlx5e_skb_from_cqe_linear(struct mlx5e_rq *rq, struct mlx5_cqe64 *cqe,
 	prefetch(data);
 
 	rcu_read_lock();
-	consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt, false);
+	mlx5e_fill_xdp_buff(rq, va, rx_headroom, cqe_bcnt, &xdp);
+	consumed = mlx5e_xdp_handle(rq, di, &cqe_bcnt, &xdp);
 	rcu_read_unlock();
 	if (consumed)
 		return NULL; /* page/packet was consumed by XDP */
 
+	rx_headroom = xdp.data - xdp.data_hard_start;
 	frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt);
 	skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt);
 	if (unlikely(!skb))
@@ -1343,6 +1364,7 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
 	struct mlx5e_dma_info *di = &wi->umr.dma_info[page_idx];
 	u16 rx_headroom = rq->buff.headroom;
 	u32 cqe_bcnt32 = cqe_bcnt;
+	struct xdp_buff xdp;
 	struct sk_buff *skb;
 	void *va, *data;
 	u32 frag_size;
@@ -1364,7 +1386,8 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
 	prefetch(data);
 
 	rcu_read_lock();
-	consumed = mlx5e_xdp_handle(rq, di, va, &rx_headroom, &cqe_bcnt32, false);
+	mlx5e_fill_xdp_buff(rq, va, rx_headroom, cqe_bcnt32, &xdp);
+	consumed = mlx5e_xdp_handle(rq, di, &cqe_bcnt32, &xdp);
 	rcu_read_unlock();
 	if (consumed) {
 		if (__test_and_clear_bit(MLX5E_RQ_FLAG_XDP_XMIT, rq->flags))
@@ -1372,6 +1395,7 @@ mlx5e_skb_from_cqe_mpwrq_linear(struct mlx5e_rq *rq, struct mlx5e_mpw_info *wi,
 		return NULL; /* page/packet was consumed by XDP */
 	}
 
+	rx_headroom = xdp.data - xdp.data_hard_start;
 	frag_size = MLX5_SKB_FRAG_SZ(rx_headroom + cqe_bcnt32);
 	skb = mlx5e_build_linear_skb(rq, va, frag_size, rx_headroom, cqe_bcnt32);
 	if (unlikely(!skb))