1 files changed, 56 insertions, 325 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 0b7d29192b2c..7276580cbe64 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -2,68 +2,30 @@
 /* Copyright(c) 2018 Intel Corporation. */
 
 #include <linux/bpf_trace.h>
-#include <net/xdp_sock.h>
+#include <net/xdp_sock_drv.h>
 #include <net/xdp.h>
 
 #include "i40e.h"
 #include "i40e_txrx_common.h"
 #include "i40e_xsk.h"
 
-/**
- * i40e_xsk_umem_dma_map - DMA maps all UMEM memory for the netdev
- * @vsi: Current VSI
- * @umem: UMEM to DMA map
- *
- * Returns 0 on success, <0 on failure
- **/
-static int i40e_xsk_umem_dma_map(struct i40e_vsi *vsi, struct xdp_umem *umem)
+int i40e_alloc_rx_bi_zc(struct i40e_ring *rx_ring)
 {
-	struct i40e_pf *pf = vsi->back;
-	struct device *dev;
-	unsigned int i, j;
-	dma_addr_t dma;
-
-	dev = &pf->pdev->dev;
-	for (i = 0; i < umem->npgs; i++) {
-		dma = dma_map_page_attrs(dev, umem->pgs[i], 0, PAGE_SIZE,
-					 DMA_BIDIRECTIONAL, I40E_RX_DMA_ATTR);
-		if (dma_mapping_error(dev, dma))
-			goto out_unmap;
+	unsigned long sz = sizeof(*rx_ring->rx_bi_zc) * rx_ring->count;
 
-		umem->pages[i].dma = dma;
-	}
-
-	return 0;
-
-out_unmap:
-	for (j = 0; j < i; j++) {
-		dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
-				     DMA_BIDIRECTIONAL, I40E_RX_DMA_ATTR);
-		umem->pages[i].dma = 0;
-	}
-
-	return -1;
+	rx_ring->rx_bi_zc = kzalloc(sz, GFP_KERNEL);
+	return rx_ring->rx_bi_zc ? 0 : -ENOMEM;
 }
 
-/**
- * i40e_xsk_umem_dma_unmap - DMA unmaps all UMEM memory for the netdev
- * @vsi: Current VSI
- * @umem: UMEM to DMA map
- **/
-static void i40e_xsk_umem_dma_unmap(struct i40e_vsi *vsi, struct xdp_umem *umem)
+void i40e_clear_rx_bi_zc(struct i40e_ring *rx_ring)
 {
-	struct i40e_pf *pf = vsi->back;
-	struct device *dev;
-	unsigned int i;
-
-	dev = &pf->pdev->dev;
-
-	for (i = 0; i < umem->npgs; i++) {
-		dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
-				     DMA_BIDIRECTIONAL, I40E_RX_DMA_ATTR);
+	memset(rx_ring->rx_bi_zc, 0,
+	       sizeof(*rx_ring->rx_bi_zc) * rx_ring->count);
+}
 
-		umem->pages[i].dma = 0;
-	}
+static struct xdp_buff **i40e_rx_bi(struct i40e_ring *rx_ring, u32 idx)
+{
+	return &rx_ring->rx_bi_zc[idx];
 }
 
 /**
@@ -78,7 +40,6 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
 				u16 qid)
 {
 	struct net_device *netdev = vsi->netdev;
-	struct xdp_umem_fq_reuse *reuseq;
 	bool if_running;
 	int err;
 
@@ -92,13 +53,7 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
 	    qid >= netdev->real_num_tx_queues)
 		return -EINVAL;
 
-	reuseq = xsk_reuseq_prepare(vsi->rx_rings[0]->count);
-	if (!reuseq)
-		return -ENOMEM;
-
-	xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
-
-	err = i40e_xsk_umem_dma_map(vsi, umem);
+	err = xsk_buff_dma_map(umem, &vsi->back->pdev->dev, I40E_RX_DMA_ATTR);
 	if (err)
 		return err;
 
@@ -151,7 +106,7 @@ static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
 	}
 
 	clear_bit(qid, vsi->af_xdp_zc_qps);
-	i40e_xsk_umem_dma_unmap(vsi, umem);
+	xsk_buff_dma_unmap(umem, I40E_RX_DMA_ATTR);
 
 	if (if_running) {
 		err = i40e_queue_pair_enable(vsi, qid);
@@ -184,17 +139,13 @@ int i40e_xsk_umem_setup(struct i40e_vsi *vsi, struct xdp_umem *umem,
  * @rx_ring: Rx ring
  * @xdp: xdp_buff used as input to the XDP program
  *
- * This function enables or disables a UMEM to a certain ring.
- *
  * Returns any of I40E_XDP_{PASS, CONSUMED, TX, REDIR}
  **/
 static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 {
-	struct xdp_umem *umem = rx_ring->xsk_umem;
 	int err, result = I40E_XDP_PASS;
 	struct i40e_ring *xdp_ring;
 	struct bpf_prog *xdp_prog;
-	u64 offset;
 	u32 act;
 
 	rcu_read_lock();
@@ -203,9 +154,6 @@ static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 	 */
 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
-	offset = xdp->data - xdp->data_hard_start;
-
-	xdp->handle = xsk_umem_adjust_offset(umem, xdp->handle, offset);
 
 	switch (act) {
 	case XDP_PASS:
@@ -232,107 +180,26 @@ static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 	return result;
 }
 
-/**
- * i40e_alloc_buffer_zc - Allocates an i40e_rx_buffer
- * @rx_ring: Rx ring
- * @bi: Rx buffer to populate
- *
- * This function allocates an Rx buffer. The buffer can come from fill
- * queue, or via the recycle queue (next_to_alloc).
- *
- * Returns true for a successful allocation, false otherwise
- **/
-static bool i40e_alloc_buffer_zc(struct i40e_ring *rx_ring,
-				 struct i40e_rx_buffer *bi)
-{
-	struct xdp_umem *umem = rx_ring->xsk_umem;
-	void *addr = bi->addr;
-	u64 handle, hr;
-
-	if (addr) {
-		rx_ring->rx_stats.page_reuse_count++;
-		return true;
-	}
-
-	if (!xsk_umem_peek_addr(umem, &handle)) {
-		rx_ring->rx_stats.alloc_page_failed++;
-		return false;
-	}
-
-	hr = umem->headroom + XDP_PACKET_HEADROOM;
-
-	bi->dma = xdp_umem_get_dma(umem, handle);
-	bi->dma += hr;
-
-	bi->addr = xdp_umem_get_data(umem, handle);
-	bi->addr += hr;
-
-	bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
-
-	xsk_umem_release_addr(umem);
-	return true;
-}
-
-/**
- * i40e_alloc_buffer_slow_zc - Allocates an i40e_rx_buffer
- * @rx_ring: Rx ring
- * @bi: Rx buffer to populate
- *
- * This function allocates an Rx buffer. The buffer can come from fill
- * queue, or via the reuse queue.
- *
- * Returns true for a successful allocation, false otherwise
- **/
-static bool i40e_alloc_buffer_slow_zc(struct i40e_ring *rx_ring,
-				      struct i40e_rx_buffer *bi)
-{
-	struct xdp_umem *umem = rx_ring->xsk_umem;
-	u64 handle, hr;
-
-	if (!xsk_umem_peek_addr_rq(umem, &handle)) {
-		rx_ring->rx_stats.alloc_page_failed++;
-		return false;
-	}
-
-	handle &= rx_ring->xsk_umem->chunk_mask;
-
-	hr = umem->headroom + XDP_PACKET_HEADROOM;
-
-	bi->dma = xdp_umem_get_dma(umem, handle);
-	bi->dma += hr;
-
-	bi->addr = xdp_umem_get_data(umem, handle);
-	bi->addr += hr;
-
-	bi->handle = xsk_umem_adjust_offset(umem, handle, umem->headroom);
-
-	xsk_umem_release_addr_rq(umem);
-	return true;
-}
-
-static __always_inline bool
-__i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count,
-			   bool alloc(struct i40e_ring *rx_ring,
-				      struct i40e_rx_buffer *bi))
+bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 {
 	u16 ntu = rx_ring->next_to_use;
 	union i40e_rx_desc *rx_desc;
-	struct i40e_rx_buffer *bi;
+	struct xdp_buff **bi, *xdp;
+	dma_addr_t dma;
 	bool ok = true;
 
 	rx_desc = I40E_RX_DESC(rx_ring, ntu);
-	bi = &rx_ring->rx_bi[ntu];
+	bi = i40e_rx_bi(rx_ring, ntu);
 	do {
-		if (!alloc(rx_ring, bi)) {
+		xdp = xsk_buff_alloc(rx_ring->xsk_umem);
+		if (!xdp) {
 			ok = false;
 			goto no_buffers;
 		}
-
-		dma_sync_single_range_for_device(rx_ring->dev, bi->dma, 0,
-						 rx_ring->rx_buf_len,
-						 DMA_BIDIRECTIONAL);
-
-		rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
+		*bi = xdp;
+		dma = xsk_buff_xdp_get_dma(xdp);
+		rx_desc->read.pkt_addr = cpu_to_le64(dma);
+		rx_desc->read.hdr_addr = 0;
 
 		rx_desc++;
 		bi++;
@@ -340,11 +207,10 @@ __i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count,
 
 		if (unlikely(ntu == rx_ring->count)) {
 			rx_desc = I40E_RX_DESC(rx_ring, 0);
-			bi = rx_ring->rx_bi;
+			bi = i40e_rx_bi(rx_ring, 0);
 			ntu = 0;
 		}
 
-		rx_desc->wb.qword1.status_error_len = 0;
 		count--;
 	} while (count);
 
@@ -356,127 +222,8 @@ no_buffers:
 }
 
 /**
- * i40e_alloc_rx_buffers_zc - Allocates a number of Rx buffers
- * @rx_ring: Rx ring
- * @count: The number of buffers to allocate
- *
- * This function allocates a number of Rx buffers from the reuse queue
- * or fill ring and places them on the Rx ring.
- *
- * Returns true for a successful allocation, false otherwise
- **/
-bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
-{
-	return __i40e_alloc_rx_buffers_zc(rx_ring, count,
-					  i40e_alloc_buffer_slow_zc);
-}
-
-/**
- * i40e_alloc_rx_buffers_fast_zc - Allocates a number of Rx buffers
- * @rx_ring: Rx ring
- * @count: The number of buffers to allocate
- *
- * This function allocates a number of Rx buffers from the fill ring
- * or the internal recycle mechanism and places them on the Rx ring.
- *
- * Returns true for a successful allocation, false otherwise
- **/
-static bool i40e_alloc_rx_buffers_fast_zc(struct i40e_ring *rx_ring, u16 count)
-{
-	return __i40e_alloc_rx_buffers_zc(rx_ring, count,
-					  i40e_alloc_buffer_zc);
-}
-
-/**
- * i40e_get_rx_buffer_zc - Return the current Rx buffer
- * @rx_ring: Rx ring
- * @size: The size of the rx buffer (read from descriptor)
- *
- * This function returns the current, received Rx buffer, and also
- * does DMA synchronization.  the Rx ring.
- *
- * Returns the received Rx buffer
- **/
-static struct i40e_rx_buffer *i40e_get_rx_buffer_zc(struct i40e_ring *rx_ring,
-						    const unsigned int size)
-{
-	struct i40e_rx_buffer *bi;
-
-	bi = &rx_ring->rx_bi[rx_ring->next_to_clean];
-
-	/* we are reusing so sync this buffer for CPU use */
-	dma_sync_single_range_for_cpu(rx_ring->dev,
-				      bi->dma, 0,
-				      size,
-				      DMA_BIDIRECTIONAL);
-
-	return bi;
-}
-
-/**
- * i40e_reuse_rx_buffer_zc - Recycle an Rx buffer
- * @rx_ring: Rx ring
- * @old_bi: The Rx buffer to recycle
- *
- * This function recycles a finished Rx buffer, and places it on the
- * recycle queue (next_to_alloc).
- **/
-static void i40e_reuse_rx_buffer_zc(struct i40e_ring *rx_ring,
-				    struct i40e_rx_buffer *old_bi)
-{
-	struct i40e_rx_buffer *new_bi = &rx_ring->rx_bi[rx_ring->next_to_alloc];
-	u16 nta = rx_ring->next_to_alloc;
-
-	/* update, and store next to alloc */
-	nta++;
-	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
-
-	/* transfer page from old buffer to new buffer */
-	new_bi->dma = old_bi->dma;
-	new_bi->addr = old_bi->addr;
-	new_bi->handle = old_bi->handle;
-
-	old_bi->addr = NULL;
-}
-
-/**
- * i40e_zca_free - Free callback for MEM_TYPE_ZERO_COPY allocations
- * @alloc: Zero-copy allocator
- * @handle: Buffer handle
- **/
-void i40e_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
-{
-	struct i40e_rx_buffer *bi;
-	struct i40e_ring *rx_ring;
-	u64 hr, mask;
-	u16 nta;
-
-	rx_ring = container_of(alloc, struct i40e_ring, zca);
-	hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
-	mask = rx_ring->xsk_umem->chunk_mask;
-
-	nta = rx_ring->next_to_alloc;
-	bi = &rx_ring->rx_bi[nta];
-
-	nta++;
-	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
-
-	handle &= mask;
-
-	bi->dma = xdp_umem_get_dma(rx_ring->xsk_umem, handle);
-	bi->dma += hr;
-
-	bi->addr = xdp_umem_get_data(rx_ring->xsk_umem, handle);
-	bi->addr += hr;
-
-	bi->handle = xsk_umem_adjust_offset(rx_ring->xsk_umem, (u64)handle,
-					    rx_ring->xsk_umem->headroom);
-}
-
-/**
- * i40e_construct_skb_zc - Create skbufff from zero-copy Rx buffer
+ * i40e_construct_skb_zc - Create skbuff from zero-copy Rx buffer
  * @rx_ring: Rx ring
- * @bi: Rx buffer
  * @xdp: xdp_buff
  *
  * This functions allocates a new skb from a zero-copy Rx buffer.
@@ -484,7 +231,6 @@ void i40e_zca_free(struct zero_copy_allocator *alloc, unsigned long handle)
  * Returns the skb, or NULL on failure.
  **/
 static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
-					     struct i40e_rx_buffer *bi,
 					     struct xdp_buff *xdp)
 {
 	unsigned int metasize = xdp->data - xdp->data_meta;
@@ -503,24 +249,11 @@ static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
 	if (metasize)
 		skb_metadata_set(skb, metasize);
 
-	i40e_reuse_rx_buffer_zc(rx_ring, bi);
+	xsk_buff_free(xdp);
 	return skb;
 }
 
 /**
- * i40e_inc_ntc: Advance the next_to_clean index
- * @rx_ring: Rx ring
- **/
-static void i40e_inc_ntc(struct i40e_ring *rx_ring)
-{
-	u32 ntc = rx_ring->next_to_clean + 1;
-
-	ntc = (ntc < rx_ring->count) ? ntc : 0;
-	rx_ring->next_to_clean = ntc;
-	prefetch(I40E_RX_DESC(rx_ring, ntc));
-}
-
-/**
  * i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
  * @rx_ring: Rx ring
  * @budget: NAPI budget
@@ -534,20 +267,17 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 	unsigned int xdp_res, xdp_xmit = 0;
 	bool failure = false;
 	struct sk_buff *skb;
-	struct xdp_buff xdp;
-
-	xdp.rxq = &rx_ring->xdp_rxq;
 
 	while (likely(total_rx_packets < (unsigned int)budget)) {
-		struct i40e_rx_buffer *bi;
 		union i40e_rx_desc *rx_desc;
+		struct xdp_buff **bi;
 		unsigned int size;
 		u64 qword;
 
 		if (cleaned_count >= I40E_RX_BUFFER_WRITE) {
 			failure = failure ||
-				  !i40e_alloc_rx_buffers_fast_zc(rx_ring,
-								 cleaned_count);
+				  !i40e_alloc_rx_buffers_zc(rx_ring,
+							    cleaned_count);
 			cleaned_count = 0;
 		}
 
@@ -560,35 +290,36 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 		 */
 		dma_rmb();
 
-		bi = i40e_clean_programming_status(rx_ring, rx_desc,
-						   qword);
-		if (unlikely(bi)) {
-			i40e_reuse_rx_buffer_zc(rx_ring, bi);
+		if (i40e_rx_is_programming_status(qword)) {
+			i40e_clean_programming_status(rx_ring,
+						      rx_desc->raw.qword[0],
+						      qword);
+			bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
+			xsk_buff_free(*bi);
+			*bi = NULL;
 			cleaned_count++;
+			i40e_inc_ntc(rx_ring);
 			continue;
 		}
 
+		bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
 		size = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >>
 		       I40E_RXD_QW1_LENGTH_PBUF_SHIFT;
 		if (!size)
 			break;
 
-		bi = i40e_get_rx_buffer_zc(rx_ring, size);
-		xdp.data = bi->addr;
-		xdp.data_meta = xdp.data;
-		xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
-		xdp.data_end = xdp.data + size;
-		xdp.handle = bi->handle;
+		bi = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
+		(*bi)->data_end = (*bi)->data + size;
+		xsk_buff_dma_sync_for_cpu(*bi);
 
-		xdp_res = i40e_run_xdp_zc(rx_ring, &xdp);
+		xdp_res = i40e_run_xdp_zc(rx_ring, *bi);
 		if (xdp_res) {
-			if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR)) {
+			if (xdp_res & (I40E_XDP_TX | I40E_XDP_REDIR))
 				xdp_xmit |= xdp_res;
-				bi->addr = NULL;
-			} else {
-				i40e_reuse_rx_buffer_zc(rx_ring, bi);
-			}
+			else
+				xsk_buff_free(*bi);
 
+			*bi = NULL;
 			total_rx_bytes += size;
 			total_rx_packets++;
 
@@ -604,7 +335,8 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
 		 * BIT(I40E_RXD_QW1_ERROR_SHIFT). This is due to that
 		 * SBP is *not* set in PRT_SBPVSI (default not set).
 		 */
-		skb = i40e_construct_skb_zc(rx_ring, bi, &xdp);
+		skb = i40e_construct_skb_zc(rx_ring, *bi);
+		*bi = NULL;
 		if (!skb) {
 			rx_ring->rx_stats.alloc_buff_failed++;
 			break;
@@ -662,10 +394,9 @@ static bool i40e_xmit_zc(struct i40e_ring *xdp_ring, unsigned int budget)
 		if (!xsk_umem_consume_tx(xdp_ring->xsk_umem, &desc))
 			break;
 
-		dma = xdp_umem_get_dma(xdp_ring->xsk_umem, desc.addr);
-
-		dma_sync_single_for_device(xdp_ring->dev, dma, desc.len,
-					   DMA_BIDIRECTIONAL);
+		dma = xsk_buff_raw_get_dma(xdp_ring->xsk_umem, desc.addr);
+		xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_umem, dma,
+						 desc.len);
 
 		tx_bi = &xdp_ring->tx_bi[xdp_ring->next_to_use];
 		tx_bi->bytecount = desc.len;
@@ -824,13 +555,13 @@ void i40e_xsk_clean_rx_ring(struct i40e_ring *rx_ring)
 	u16 i;
 
 	for (i = 0; i < rx_ring->count; i++) {
-		struct i40e_rx_buffer *rx_bi = &rx_ring->rx_bi[i];
+		struct xdp_buff *rx_bi = *i40e_rx_bi(rx_ring, i);
 
-		if (!rx_bi->addr)
+		if (!rx_bi)
 			continue;
 
-		xsk_umem_fq_reuse(rx_ring->xsk_umem, rx_bi->handle);
-		rx_bi->addr = NULL;
+		xsk_buff_free(rx_bi);
+		rx_bi = NULL;
 	}
 }