Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2020-05-23

The following pull-request contains BPF updates for your *net-next* tree.

We've added 50 non-merge commits during the last 8 day(s) which contain
a total of 109 files changed, 2776 insertions(+), 2887 deletions(-).

The main changes are:

1) Add a new AF_XDP buffer allocation API to the core in order to help
   lowering the bar for drivers adopting AF_XDP support. i40e, ice, ixgbe
   as well as mlx5 have been moved over to the new API and also gained a
   small improvement in performance, from Björn Töpel and Magnus Karlsson.

2) Add getpeername()/getsockname() attach types for BPF sock_addr programs
   in order to allow for e.g. reverse translation of load-balancer backend
   to service address/port tuple from a connected peer, from Daniel Borkmann.

3) Improve the BPF verifier is_branch_taken() logic to evaluate pointers
   being non-NULL, e.g. if after an initial test another non-NULL test on
   that pointer follows in a given path, then it can be pruned right away,
   from John Fastabend.

4) Larger rework of BPF sockmap selftests to make output easier to understand
   and to reduce overall runtime as well as adding new BPF kTLS selftests
   that run in combination with sockmap, also from John Fastabend.

5) Batch of misc updates to BPF selftests including fixing up test_align
   to match verifier output again and moving it under test_progs, allowing
   bpf_iter selftest to compile on machines with older vmlinux.h, and
   updating config options for lirc and v6 segment routing helpers, from
   Stanislav Fomichev, Andrii Nakryiko and Alan Maguire.

6) Conversion of BPF tracing samples outdated internal BPF loader to use
   libbpf API instead, from Daniel T. Lee.

7) Follow-up to BPF kernel test infrastructure in order to fix a flake in
   the XDP selftests, from Jesper Dangaard Brouer.

8) Minor improvements to libbpf's internal hashmap implementation, from
   Ian Rogers.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 337 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 20ac54e3156d..b6f928c9e9c9 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -2,7 +2,7 @@
 /* Copyright (c) 2019, Intel Corporation. */
 
 #include <linux/bpf_trace.h>
-#include <net/xdp_sock.h>
+#include <net/xdp_sock_drv.h>
 #include <net/xdp.h>
 #include "ice.h"
 #include "ice_base.h"
@@ -280,28 +280,6 @@ static int ice_xsk_alloc_umems(struct ice_vsi *vsi)
 }
 
 /**
- * ice_xsk_add_umem - add a UMEM region for XDP sockets
- * @vsi: VSI to which the UMEM will be added
- * @umem: pointer to a requested UMEM region
- * @qid: queue ID
- *
- * Returns 0 on success, negative on error
- */
-static int ice_xsk_add_umem(struct ice_vsi *vsi, struct xdp_umem *umem, u16 qid)
-{
-	int err;
-
-	err = ice_xsk_alloc_umems(vsi);
-	if (err)
-		return err;
-
-	vsi->xsk_umems[qid] = umem;
-	vsi->num_xsk_umems_used++;
-
-	return 0;
-}
-
-/**
  * ice_xsk_remove_umem - Remove an UMEM for a certain ring/qid
  * @vsi: VSI from which the VSI will be removed
  * @qid: Ring/qid associated with the UMEM
@@ -318,65 +296,6 @@ static void ice_xsk_remove_umem(struct ice_vsi *vsi, u16 qid)
 	}
 }
 
-/**
- * ice_xsk_umem_dma_map - DMA map UMEM region for XDP sockets
- * @vsi: VSI to map the UMEM region
- * @umem: UMEM to map
- *
- * Returns 0 on success, negative on error
- */
-static int ice_xsk_umem_dma_map(struct ice_vsi *vsi, struct xdp_umem *umem)
-{
-	struct ice_pf *pf = vsi->back;
-	struct device *dev;
-	unsigned int i;
-
-	dev = ice_pf_to_dev(pf);
-	for (i = 0; i < umem->npgs; i++) {
-		dma_addr_t dma = dma_map_page_attrs(dev, umem->pgs[i], 0,
-						    PAGE_SIZE,
-						    DMA_BIDIRECTIONAL,
-						    ICE_RX_DMA_ATTR);
-		if (dma_mapping_error(dev, dma)) {
-			dev_dbg(dev, "XSK UMEM DMA mapping error on page num %d\n",
-				i);
-			goto out_unmap;
-		}
-
-		umem->pages[i].dma = dma;
-	}
-
-	return 0;
-
-out_unmap:
-	for (; i > 0; i--) {
-		dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
-				     DMA_BIDIRECTIONAL, ICE_RX_DMA_ATTR);
-		umem->pages[i].dma = 0;
-	}
-
-	return -EFAULT;
-}
-
-/**
- * ice_xsk_umem_dma_unmap - DMA unmap UMEM region for XDP sockets
- * @vsi: VSI from which the UMEM will be unmapped
- * @umem: UMEM to unmap
- */
-static void ice_xsk_umem_dma_unmap(struct ice_vsi *vsi, struct xdp_umem *umem)
-{
-	struct ice_pf *pf = vsi->back;
-	struct device *dev;
-	unsigned int i;
-
-	dev = ice_pf_to_dev(pf);
-	for (i = 0; i < umem->npgs; i++) {
-		dma_unmap_page_attrs(dev, umem->pages[i].dma, PAGE_SIZE,
-				     DMA_BIDIRECTIONAL, ICE_RX_DMA_ATTR);
-
-		umem->pages[i].dma = 0;
-	}
-}
 
 /**
  * ice_xsk_umem_disable - disable a UMEM region
@@ -391,7 +310,7 @@ static int ice_xsk_umem_disable(struct ice_vsi *vsi, u16 qid)
 	    !vsi->xsk_umems[qid])
 		return -EINVAL;
 
-	ice_xsk_umem_dma_unmap(vsi, vsi->xsk_umems[qid]);
+	xsk_buff_dma_unmap(vsi->xsk_umems[qid], ICE_RX_DMA_ATTR);
 	ice_xsk_remove_umem(vsi, qid);
 
 	return 0;
@@ -408,7 +327,6 @@ static int ice_xsk_umem_disable(struct ice_vsi *vsi, u16 qid)
 static int
 ice_xsk_umem_enable(struct ice_vsi *vsi, struct xdp_umem *umem, u16 qid)
 {
-	struct xdp_umem_fq_reuse *reuseq;
 	int err;
 
 	if (vsi->type != ICE_VSI_PF)
@@ -419,20 +337,18 @@ ice_xsk_umem_enable(struct ice_vsi *vsi, struct xdp_umem *umem, u16 qid)
 	if (qid >= vsi->num_xsk_umems)
 		return -EINVAL;
 
+	err = ice_xsk_alloc_umems(vsi);
+	if (err)
+		return err;
+
 	if (vsi->xsk_umems && vsi->xsk_umems[qid])
 		return -EBUSY;
 
-	reuseq = xsk_reuseq_prepare(vsi->rx_rings[0]->count);
-	if (!reuseq)
-		return -ENOMEM;
-
-	xsk_reuseq_free(xsk_reuseq_swap(umem, reuseq));
-
-	err = ice_xsk_umem_dma_map(vsi, umem);
-	if (err)
-		return err;
+	vsi->xsk_umems[qid] = umem;
+	vsi->num_xsk_umems_used++;
 
-	err = ice_xsk_add_umem(vsi, umem, qid);
+	err = xsk_buff_dma_map(vsi->xsk_umems[qid], ice_pf_to_dev(vsi->back),
+			       ICE_RX_DMA_ATTR);
 	if (err)
 		return err;
 
@@ -484,137 +400,22 @@ xsk_umem_if_up:
 }
 
 /**
- * ice_zca_free - Callback for MEM_TYPE_ZERO_COPY allocations
- * @zca: zero-cpoy allocator
- * @handle: Buffer handle
- */
-void ice_zca_free(struct zero_copy_allocator *zca, unsigned long handle)
-{
-	struct ice_rx_buf *rx_buf;
-	struct ice_ring *rx_ring;
-	struct xdp_umem *umem;
-	u64 hr, mask;
-	u16 nta;
-
-	rx_ring = container_of(zca, struct ice_ring, zca);
-	umem = rx_ring->xsk_umem;
-	hr = umem->headroom + XDP_PACKET_HEADROOM;
-
-	mask = umem->chunk_mask;
-
-	nta = rx_ring->next_to_alloc;
-	rx_buf = &rx_ring->rx_buf[nta];
-
-	nta++;
-	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
-
-	handle &= mask;
-
-	rx_buf->dma = xdp_umem_get_dma(umem, handle);
-	rx_buf->dma += hr;
-
-	rx_buf->addr = xdp_umem_get_data(umem, handle);
-	rx_buf->addr += hr;
-
-	rx_buf->handle = (u64)handle + umem->headroom;
-}
-
-/**
- * ice_alloc_buf_fast_zc - Retrieve buffer address from XDP umem
- * @rx_ring: ring with an xdp_umem bound to it
- * @rx_buf: buffer to which xsk page address will be assigned
- *
- * This function allocates an Rx buffer in the hot path.
- * The buffer can come from fill queue or recycle queue.
- *
- * Returns true if an assignment was successful, false if not.
- */
-static __always_inline bool
-ice_alloc_buf_fast_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf)
-{
-	struct xdp_umem *umem = rx_ring->xsk_umem;
-	void *addr = rx_buf->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;
-
-	rx_buf->dma = xdp_umem_get_dma(umem, handle);
-	rx_buf->dma += hr;
-
-	rx_buf->addr = xdp_umem_get_data(umem, handle);
-	rx_buf->addr += hr;
-
-	rx_buf->handle = handle + umem->headroom;
-
-	xsk_umem_release_addr(umem);
-	return true;
-}
-
-/**
- * ice_alloc_buf_slow_zc - Retrieve buffer address from XDP umem
- * @rx_ring: ring with an xdp_umem bound to it
- * @rx_buf: buffer to which xsk page address will be assigned
- *
- * This function allocates an Rx buffer in the slow path.
- * The buffer can come from fill queue or recycle queue.
- *
- * Returns true if an assignment was successful, false if not.
- */
-static __always_inline bool
-ice_alloc_buf_slow_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf)
-{
-	struct xdp_umem *umem = rx_ring->xsk_umem;
-	u64 handle, headroom;
-
-	if (!xsk_umem_peek_addr_rq(umem, &handle)) {
-		rx_ring->rx_stats.alloc_page_failed++;
-		return false;
-	}
-
-	handle &= umem->chunk_mask;
-	headroom = umem->headroom + XDP_PACKET_HEADROOM;
-
-	rx_buf->dma = xdp_umem_get_dma(umem, handle);
-	rx_buf->dma += headroom;
-
-	rx_buf->addr = xdp_umem_get_data(umem, handle);
-	rx_buf->addr += headroom;
-
-	rx_buf->handle = handle + umem->headroom;
-
-	xsk_umem_release_addr_rq(umem);
-	return true;
-}
-
-/**
  * ice_alloc_rx_bufs_zc - allocate a number of Rx buffers
  * @rx_ring: Rx ring
  * @count: The number of buffers to allocate
- * @alloc: the function pointer to call for allocation
  *
  * 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 false if all allocations were successful, true if any fail.
  */
-static bool
-ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, int count,
-		     bool (*alloc)(struct ice_ring *, struct ice_rx_buf *))
+bool ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, u16 count)
 {
 	union ice_32b_rx_flex_desc *rx_desc;
 	u16 ntu = rx_ring->next_to_use;
 	struct ice_rx_buf *rx_buf;
 	bool ret = false;
+	dma_addr_t dma;
 
 	if (!count)
 		return false;
@@ -623,16 +424,14 @@ ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, int count,
 	rx_buf = &rx_ring->rx_buf[ntu];
 
 	do {
-		if (!alloc(rx_ring, rx_buf)) {
+		rx_buf->xdp = xsk_buff_alloc(rx_ring->xsk_umem);
+		if (!rx_buf->xdp) {
 			ret = true;
 			break;
 		}
 
-		dma_sync_single_range_for_device(rx_ring->dev, rx_buf->dma, 0,
-						 rx_ring->rx_buf_len,
-						 DMA_BIDIRECTIONAL);
-
-		rx_desc->read.pkt_addr = cpu_to_le64(rx_buf->dma);
+		dma = xsk_buff_xdp_get_dma(rx_buf->xdp);
+		rx_desc->read.pkt_addr = cpu_to_le64(dma);
 		rx_desc->wb.status_error0 = 0;
 
 		rx_desc++;
@@ -653,32 +452,6 @@ ice_alloc_rx_bufs_zc(struct ice_ring *rx_ring, int count,
 }
 
 /**
- * ice_alloc_rx_bufs_fast_zc - allocate zero copy bufs in the hot path
- * @rx_ring: Rx ring
- * @count: number of bufs to allocate
- *
- * Returns false on success, true on failure.
- */
-static bool ice_alloc_rx_bufs_fast_zc(struct ice_ring *rx_ring, u16 count)
-{
-	return ice_alloc_rx_bufs_zc(rx_ring, count,
-				    ice_alloc_buf_fast_zc);
-}
-
-/**
- * ice_alloc_rx_bufs_slow_zc - allocate zero copy bufs in the slow path
- * @rx_ring: Rx ring
- * @count: number of bufs to allocate
- *
- * Returns false on success, true on failure.
- */
-bool ice_alloc_rx_bufs_slow_zc(struct ice_ring *rx_ring, u16 count)
-{
-	return ice_alloc_rx_bufs_zc(rx_ring, count,
-				    ice_alloc_buf_slow_zc);
-}
-
-/**
  * ice_bump_ntc - Bump the next_to_clean counter of an Rx ring
  * @rx_ring: Rx ring
  */
@@ -692,76 +465,21 @@ static void ice_bump_ntc(struct ice_ring *rx_ring)
 }
 
 /**
- * ice_get_rx_buf_zc - Fetch the current Rx buffer
- * @rx_ring: Rx ring
- * @size: size of a buffer
- *
- * This function returns the current, received Rx buffer and does
- * DMA synchronization.
- *
- * Returns a pointer to the received Rx buffer.
- */
-static struct ice_rx_buf *ice_get_rx_buf_zc(struct ice_ring *rx_ring, int size)
-{
-	struct ice_rx_buf *rx_buf;
-
-	rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean];
-
-	dma_sync_single_range_for_cpu(rx_ring->dev, rx_buf->dma, 0,
-				      size, DMA_BIDIRECTIONAL);
-
-	return rx_buf;
-}
-
-/**
- * ice_reuse_rx_buf_zc - reuse an Rx buffer
- * @rx_ring: Rx ring
- * @old_buf: The buffer to recycle
- *
- * This function recycles a finished Rx buffer, and places it on the recycle
- * queue (next_to_alloc).
- */
-static void
-ice_reuse_rx_buf_zc(struct ice_ring *rx_ring, struct ice_rx_buf *old_buf)
-{
-	unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask;
-	u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM;
-	u16 nta = rx_ring->next_to_alloc;
-	struct ice_rx_buf *new_buf;
-
-	new_buf = &rx_ring->rx_buf[nta++];
-	rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
-
-	new_buf->dma = old_buf->dma & mask;
-	new_buf->dma += hr;
-
-	new_buf->addr = (void *)((unsigned long)old_buf->addr & mask);
-	new_buf->addr += hr;
-
-	new_buf->handle = old_buf->handle & mask;
-	new_buf->handle += rx_ring->xsk_umem->headroom;
-
-	old_buf->addr = NULL;
-}
-
-/**
  * ice_construct_skb_zc - Create an sk_buff from zero-copy buffer
  * @rx_ring: Rx ring
  * @rx_buf: zero-copy Rx buffer
- * @xdp: XDP buffer
  *
  * This function allocates a new skb from a zero-copy Rx buffer.
  *
  * Returns the skb on success, NULL on failure.
  */
 static struct sk_buff *
-ice_construct_skb_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
-		     struct xdp_buff *xdp)
+ice_construct_skb_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf)
 {
-	unsigned int metasize = xdp->data - xdp->data_meta;
-	unsigned int datasize = xdp->data_end - xdp->data;
-	unsigned int datasize_hard = xdp->data_end -
-				     xdp->data_hard_start;
+	unsigned int metasize = rx_buf->xdp->data - rx_buf->xdp->data_meta;
+	unsigned int datasize = rx_buf->xdp->data_end - rx_buf->xdp->data;
+	unsigned int datasize_hard = rx_buf->xdp->data_end -
+				     rx_buf->xdp->data_hard_start;
 	struct sk_buff *skb;
 
 	skb = __napi_alloc_skb(&rx_ring->q_vector->napi, datasize_hard,
@@ -769,13 +487,13 @@ ice_construct_skb_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf,
 	if (unlikely(!skb))
 		return NULL;
 
-	skb_reserve(skb, xdp->data - xdp->data_hard_start);
-	memcpy(__skb_put(skb, datasize), xdp->data, datasize);
+	skb_reserve(skb, rx_buf->xdp->data - rx_buf->xdp->data_hard_start);
+	memcpy(__skb_put(skb, datasize), rx_buf->xdp->data, datasize);
 	if (metasize)
 		skb_metadata_set(skb, metasize);
 
-	ice_reuse_rx_buf_zc(rx_ring, rx_buf);
-
+	xsk_buff_free(rx_buf->xdp);
+	rx_buf->xdp = NULL;
 	return skb;
 }
 
@@ -802,7 +520,6 @@ ice_run_xdp_zc(struct ice_ring *rx_ring, struct xdp_buff *xdp)
 	}
 
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
-	xdp->handle += xdp->data - xdp->data_hard_start;
 	switch (act) {
 	case XDP_PASS:
 		break;
@@ -840,13 +557,8 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 {
 	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
 	u16 cleaned_count = ICE_DESC_UNUSED(rx_ring);
-	struct xdp_umem *umem = rx_ring->xsk_umem;
 	unsigned int xdp_xmit = 0;
 	bool failure = false;
-	struct xdp_buff xdp;
-
-	xdp.rxq = &rx_ring->xdp_rxq;
-	xdp.frame_sz = xsk_umem_xdp_frame_sz(umem);
 
 	while (likely(total_rx_packets < (unsigned int)budget)) {
 		union ice_32b_rx_flex_desc *rx_desc;
@@ -858,8 +570,8 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 		u8 rx_ptype;
 
 		if (cleaned_count >= ICE_RX_BUF_WRITE) {
-			failure |= ice_alloc_rx_bufs_fast_zc(rx_ring,
-							     cleaned_count);
+			failure |= ice_alloc_rx_bufs_zc(rx_ring,
+							cleaned_count);
 			cleaned_count = 0;
 		}
 
@@ -880,25 +592,19 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 		if (!size)
 			break;
 
-		rx_buf = ice_get_rx_buf_zc(rx_ring, size);
-		if (!rx_buf->addr)
-			break;
 
-		xdp.data = rx_buf->addr;
-		xdp.data_meta = xdp.data;
-		xdp.data_hard_start = xdp.data - XDP_PACKET_HEADROOM;
-		xdp.data_end = xdp.data + size;
-		xdp.handle = rx_buf->handle;
+		rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean];
+		rx_buf->xdp->data_end = rx_buf->xdp->data + size;
+		xsk_buff_dma_sync_for_cpu(rx_buf->xdp);
 
-		xdp_res = ice_run_xdp_zc(rx_ring, &xdp);
+		xdp_res = ice_run_xdp_zc(rx_ring, rx_buf->xdp);
 		if (xdp_res) {
-			if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR)) {
+			if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))
 				xdp_xmit |= xdp_res;
-				rx_buf->addr = NULL;
-			} else {
-				ice_reuse_rx_buf_zc(rx_ring, rx_buf);
-			}
+			else
+				xsk_buff_free(rx_buf->xdp);
 
+			rx_buf->xdp = NULL;
 			total_rx_bytes += size;
 			total_rx_packets++;
 			cleaned_count++;
@@ -908,7 +614,7 @@ int ice_clean_rx_irq_zc(struct ice_ring *rx_ring, int budget)
 		}
 
 		/* XDP_PASS path */
-		skb = ice_construct_skb_zc(rx_ring, rx_buf, &xdp);
+		skb = ice_construct_skb_zc(rx_ring, rx_buf);
 		if (!skb) {
 			rx_ring->rx_stats.alloc_buf_failed++;
 			break;
@@ -979,10 +685,9 @@ static bool ice_xmit_zc(struct ice_ring *xdp_ring, 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_buf->bytecount = desc.len;
 
@@ -1165,11 +870,10 @@ void ice_xsk_clean_rx_ring(struct ice_ring *rx_ring)
 	for (i = 0; i < rx_ring->count; i++) {
 		struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i];
 
-		if (!rx_buf->addr)
+		if (!rx_buf->xdp)
 			continue;
 
-		xsk_umem_fq_reuse(rx_ring->xsk_umem, rx_buf->handle);
-		rx_buf->addr = NULL;
+		rx_buf->xdp = NULL;
 	}
 }