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

Alexei Starovoitov says:

====================
pull-request: bpf-next 2021-03-24

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

We've added 37 non-merge commits during the last 15 day(s) which contain
a total of 65 files changed, 3200 insertions(+), 738 deletions(-).

The main changes are:

1) Static linking of multiple BPF ELF files, from Andrii.

2) Move drop error path to devmap for XDP_REDIRECT, from Lorenzo.

3) Spelling fixes from various folks.
====================

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

arch/s390/net/bpf_jit_comp.c

@@ -1209,21 +1209,67 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
 	 */
 	case BPF_STX | BPF_ATOMIC | BPF_DW:
 	case BPF_STX | BPF_ATOMIC | BPF_W:
-		if (insn->imm != BPF_ADD) {
+	{
+		bool is32 = BPF_SIZE(insn->code) == BPF_W;
+
+		switch (insn->imm) {
+/* {op32|op64} {%w0|%src},%src,off(%dst) */
+#define EMIT_ATOMIC(op32, op64) do {					\
+	EMIT6_DISP_LH(0xeb000000, is32 ? (op32) : (op64),		\
+		      (insn->imm & BPF_FETCH) ? src_reg : REG_W0,	\
+		      src_reg, dst_reg, off);				\
+	if (is32 && (insn->imm & BPF_FETCH))				\
+		EMIT_ZERO(src_reg);					\
+} while (0)
+		case BPF_ADD:
+		case BPF_ADD | BPF_FETCH:
+			/* {laal|laalg} */
+			EMIT_ATOMIC(0x00fa, 0x00ea);
+			break;
+		case BPF_AND:
+		case BPF_AND | BPF_FETCH:
+			/* {lan|lang} */
+			EMIT_ATOMIC(0x00f4, 0x00e4);
+			break;
+		case BPF_OR:
+		case BPF_OR | BPF_FETCH:
+			/* {lao|laog} */
+			EMIT_ATOMIC(0x00f6, 0x00e6);
+			break;
+		case BPF_XOR:
+		case BPF_XOR | BPF_FETCH:
+			/* {lax|laxg} */
+			EMIT_ATOMIC(0x00f7, 0x00e7);
+			break;
+#undef EMIT_ATOMIC
+		case BPF_XCHG:
+			/* {ly|lg} %w0,off(%dst) */
+			EMIT6_DISP_LH(0xe3000000,
+				      is32 ? 0x0058 : 0x0004, REG_W0, REG_0,
+				      dst_reg, off);
+			/* 0: {csy|csg} %w0,%src,off(%dst) */
+			EMIT6_DISP_LH(0xeb000000, is32 ? 0x0014 : 0x0030,
+				      REG_W0, src_reg, dst_reg, off);
+			/* brc 4,0b */
+			EMIT4_PCREL_RIC(0xa7040000, 4, jit->prg - 6);
+			/* {llgfr|lgr} %src,%w0 */
+			EMIT4(is32 ? 0xb9160000 : 0xb9040000, src_reg, REG_W0);
+			if (is32 && insn_is_zext(&insn[1]))
+				insn_count = 2;
+			break;
+		case BPF_CMPXCHG:
+			/* 0: {csy|csg} %b0,%src,off(%dst) */
+			EMIT6_DISP_LH(0xeb000000, is32 ? 0x0014 : 0x0030,
+				      BPF_REG_0, src_reg, dst_reg, off);
+			break;
+		default:
 			pr_err("Unknown atomic operation %02x\n", insn->imm);
 			return -1;
 		}
 
-		/* *(u32/u64 *)(dst + off) += src
-		 *
-		 * BFW_W:  laal  %w0,%src,off(%dst)
-		 * BPF_DW: laalg %w0,%src,off(%dst)
-		 */
-		EMIT6_DISP_LH(0xeb000000,
-			      BPF_SIZE(insn->code) == BPF_W ? 0x00fa : 0x00ea,
-			      REG_W0, src_reg, dst_reg, off);
 		jit->seen |= SEEN_MEM;
 		break;
+	}
 	/*
 	 * BPF_LDX
 	 */

drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -300,7 +300,7 @@ static int ena_xdp_xmit_frame(struct ena_ring *xdp_ring,
 
 	rc = ena_xdp_tx_map_frame(xdp_ring, tx_info, xdpf, &push_hdr, &push_len);
 	if (unlikely(rc))
-		goto error_drop_packet;
+		return rc;
 
 	ena_tx_ctx.ena_bufs = tx_info->bufs;
 	ena_tx_ctx.push_header = push_hdr;
@@ -330,17 +330,15 @@ static int ena_xdp_xmit_frame(struct ena_ring *xdp_ring,
 error_unmap_dma:
 	ena_unmap_tx_buff(xdp_ring, tx_info);
 	tx_info->xdpf = NULL;
-error_drop_packet:
-	xdp_return_frame(xdpf);
 	return rc;
 }
 
 static int ena_xdp_xmit(struct net_device *dev, int n,
 			struct xdp_frame **frames, u32 flags)
 {
 	struct ena_adapter *adapter = netdev_priv(dev);
-	int qid, i, err, drops = 0;
 	struct ena_ring *xdp_ring;
+	int qid, i, nxmit = 0;
 
 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
 		return -EINVAL;
@@ -360,12 +358,9 @@ static int ena_xdp_xmit(struct net_device *dev, int n,
 	spin_lock(&xdp_ring->xdp_tx_lock);
 
 	for (i = 0; i < n; i++) {
-		err = ena_xdp_xmit_frame(xdp_ring, dev, frames[i], 0);
-		/* The descriptor is freed by ena_xdp_xmit_frame in case
-		 * of an error.
-		 */
-		if (err)
-			drops++;
+		if (ena_xdp_xmit_frame(xdp_ring, dev, frames[i], 0))
+			break;
+		nxmit++;
 	}
 
 	/* Ring doorbell to make device aware of the packets */
@@ -378,7 +373,7 @@ static int ena_xdp_xmit(struct net_device *dev, int n,
 	spin_unlock(&xdp_ring->xdp_tx_lock);
 
 	/* Return number of packets sent */
-	return n - drops;
+	return nxmit;
 }
 
 static int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp)
@@ -415,7 +410,9 @@ static int ena_xdp_execute(struct ena_ring *rx_ring, struct xdp_buff *xdp)
 		/* The XDP queues are shared between XDP_TX and XDP_REDIRECT */
 		spin_lock(&xdp_ring->xdp_tx_lock);
 
-		ena_xdp_xmit_frame(xdp_ring, rx_ring->netdev, xdpf, XDP_XMIT_FLUSH);
+		if (ena_xdp_xmit_frame(xdp_ring, rx_ring->netdev, xdpf,
+				       XDP_XMIT_FLUSH))
+			xdp_return_frame(xdpf);
 
 		spin_unlock(&xdp_ring->xdp_tx_lock);
 		xdp_stat = &rx_ring->rx_stats.xdp_tx;

drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c

@@ -217,7 +217,7 @@ int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
 	struct pci_dev *pdev = bp->pdev;
 	struct bnxt_tx_ring_info *txr;
 	dma_addr_t mapping;
-	int drops = 0;
+	int nxmit = 0;
 	int ring;
 	int i;
 
@@ -233,21 +233,17 @@ int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
 		struct xdp_frame *xdp = frames[i];
 
 		if (!txr || !bnxt_tx_avail(bp, txr) ||
-		    !(bp->bnapi[ring]->flags & BNXT_NAPI_FLAG_XDP)) {
-			xdp_return_frame_rx_napi(xdp);
-			drops++;
-			continue;
-		}
+		    !(bp->bnapi[ring]->flags & BNXT_NAPI_FLAG_XDP))
+			break;
 
 		mapping = dma_map_single(&pdev->dev, xdp->data, xdp->len,
 					 DMA_TO_DEVICE);
 
-		if (dma_mapping_error(&pdev->dev, mapping)) {
-			xdp_return_frame_rx_napi(xdp);
-			drops++;
-			continue;
-		}
+		if (dma_mapping_error(&pdev->dev, mapping))
+			break;
+
 		__bnxt_xmit_xdp_redirect(bp, txr, mapping, xdp->len, xdp);
+		nxmit++;
 	}
 
 	if (flags & XDP_XMIT_FLUSH) {
@@ -256,7 +252,7 @@ int bnxt_xdp_xmit(struct net_device *dev, int num_frames,
 		bnxt_db_write(bp, &txr->tx_db, txr->tx_prod);
 	}
 
-	return num_frames - drops;
+	return nxmit;
 }
 
 /* Under rtnl_lock */

drivers/net/ethernet/freescale/dpaa/dpaa_eth.c

@@ -3081,7 +3081,7 @@ static int dpaa_xdp_xmit(struct net_device *net_dev, int n,
 			 struct xdp_frame **frames, u32 flags)
 {
 	struct xdp_frame *xdpf;
-	int i, err, drops = 0;
+	int i, nxmit = 0;
 
 	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
 		return -EINVAL;
@@ -3091,14 +3091,12 @@ static int dpaa_xdp_xmit(struct net_device *net_dev, int n,
 
 	for (i = 0; i < n; i++) {
 		xdpf = frames[i];
-		err = dpaa_xdp_xmit_frame(net_dev, xdpf);
-		if (err) {
-			xdp_return_frame_rx_napi(xdpf);
-			drops++;
-		}
+		if (dpaa_xdp_xmit_frame(net_dev, xdpf))
+			break;
+		nxmit++;
 	}
 
-	return n - drops;
+	return nxmit;
 }
 
 static int dpaa_ts_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

@@ -2431,8 +2431,6 @@ static int dpaa2_eth_xdp_xmit(struct net_device *net_dev, int n,
 	percpu_stats->tx_packets += enqueued;
 	for (i = 0; i < enqueued; i++)
 		percpu_stats->tx_bytes += dpaa2_fd_get_len(&fds[i]);
-	for (i = enqueued; i < n; i++)
-		xdp_return_frame_rx_napi(frames[i]);
 
 	return enqueued;
 }

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -3835,8 +3835,8 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
  * @frames: array of XDP buffer pointers
  * @flags: XDP extra info
  *
- * Returns number of frames successfully sent. Frames that fail are
- * free'ed via XDP return API.
+ * Returns number of frames successfully sent. Failed frames
+ * will be free'ed by XDP core.
  *
  * For error cases, a negative errno code is returned and no-frames
  * are transmitted (caller must handle freeing frames).
@@ -3849,7 +3849,7 @@ int i40e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_pf *pf = vsi->back;
 	struct i40e_ring *xdp_ring;
-	int drops = 0;
+	int nxmit = 0;
 	int i;
 
 	if (test_bit(__I40E_VSI_DOWN, vsi->state))
@@ -3869,14 +3869,13 @@ int i40e_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 		int err;
 
 		err = i40e_xmit_xdp_ring(xdpf, xdp_ring);
-		if (err != I40E_XDP_TX) {
-			xdp_return_frame_rx_napi(xdpf);
-			drops++;
-		}
+		if (err != I40E_XDP_TX)
+			break;
+		nxmit++;
 	}
 
 	if (unlikely(flags & XDP_XMIT_FLUSH))
 		i40e_xdp_ring_update_tail(xdp_ring);
 
-	return n - drops;
+	return nxmit;
 }

drivers/net/ethernet/intel/ice/ice_txrx.c

@@ -554,8 +554,8 @@ ice_run_xdp(struct ice_ring *rx_ring, struct xdp_buff *xdp,
  * @frames: XDP frames to be transmitted
  * @flags: transmit flags
  *
- * Returns number of frames successfully sent. Frames that fail are
- * free'ed via XDP return API.
+ * Returns number of frames successfully sent. Failed frames
+ * will be free'ed by XDP core.
  * For error cases, a negative errno code is returned and no-frames
  * are transmitted (caller must handle freeing frames).
  */
@@ -567,7 +567,7 @@ ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 	unsigned int queue_index = smp_processor_id();
 	struct ice_vsi *vsi = np->vsi;
 	struct ice_ring *xdp_ring;
-	int drops = 0, i;
+	int nxmit = 0, i;
 
 	if (test_bit(__ICE_DOWN, vsi->state))
 		return -ENETDOWN;
@@ -584,16 +584,15 @@ ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
 		int err;
 
 		err = ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring);
-		if (err != ICE_XDP_TX) {
-			xdp_return_frame_rx_napi(xdpf);
-			drops++;
-		}
+		if (err != ICE_XDP_TX)
+			break;
+		nxmit++;
 	}
 
 	if (unlikely(flags & XDP_XMIT_FLUSH))
 		ice_xdp_ring_update_tail(xdp_ring);
 
-	return n - drops;
+	return nxmit;
 }
 
 /**

drivers/net/ethernet/intel/igb/igb_main.c

@@ -2934,7 +2934,7 @@ static int igb_xdp_xmit(struct net_device *dev, int n,
 	int cpu = smp_processor_id();
 	struct igb_ring *tx_ring;
 	struct netdev_queue *nq;
-	int drops = 0;
+	int nxmit = 0;
 	int i;
 
 	if (unlikely(test_bit(__IGB_DOWN, &adapter->state)))
@@ -2961,18 +2961,17 @@ static int igb_xdp_xmit(struct net_device *dev, int n,
 		int err;
 
 		err = igb_xmit_xdp_ring(adapter, tx_ring, xdpf);
-		if (err != IGB_XDP_TX) {
-			xdp_return_frame_rx_napi(xdpf);
-			drops++;
-		}
+		if (err != IGB_XDP_TX)
+			break;
+		nxmit++;
 	}
 
 	__netif_tx_unlock(nq);
 
 	if (unlikely(flags & XDP_XMIT_FLUSH))
 		igb_xdp_ring_update_tail(tx_ring);
 
-	return n - drops;
+	return nxmit;
 }
 
 static const struct net_device_ops igb_netdev_ops = {

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -10189,7 +10189,7 @@ static int ixgbe_xdp_xmit(struct net_device *dev, int n,
 {
 	struct ixgbe_adapter *adapter = netdev_priv(dev);
 	struct ixgbe_ring *ring;
-	int drops = 0;
+	int nxmit = 0;
 	int i;
 
 	if (unlikely(test_bit(__IXGBE_DOWN, &adapter->state)))
@@ -10213,16 +10213,15 @@ static int ixgbe_xdp_xmit(struct net_device *dev, int n,
 		int err;
 
 		err = ixgbe_xmit_xdp_ring(adapter, xdpf);
-		if (err != IXGBE_XDP_TX) {
-			xdp_return_frame_rx_napi(xdpf);
-			drops++;
-		}
+		if (err != IXGBE_XDP_TX)
+			break;
+		nxmit++;
 	}
 
 	if (unlikely(flags & XDP_XMIT_FLUSH))
 		ixgbe_xdp_ring_update_tail(ring);
 
-	return n - drops;
+	return nxmit;
 }
 
 static const struct net_device_ops ixgbe_netdev_ops = {

drivers/net/ethernet/marvell/mvneta.c

@@ -2137,7 +2137,7 @@ mvneta_xdp_xmit(struct net_device *dev, int num_frame,
 {
 	struct mvneta_port *pp = netdev_priv(dev);
 	struct mvneta_pcpu_stats *stats = this_cpu_ptr(pp->stats);
-	int i, nxmit_byte = 0, nxmit = num_frame;
+	int i, nxmit_byte = 0, nxmit = 0;
 	int cpu = smp_processor_id();
 	struct mvneta_tx_queue *txq;
 	struct netdev_queue *nq;
@@ -2155,12 +2155,11 @@ mvneta_xdp_xmit(struct net_device *dev, int num_frame,
 	__netif_tx_lock(nq, cpu);
 	for (i = 0; i < num_frame; i++) {
 		ret = mvneta_xdp_submit_frame(pp, txq, frames[i], true);
-		if (ret == MVNETA_XDP_TX) {
-			nxmit_byte += frames[i]->len;
-		} else {
-			xdp_return_frame_rx_napi(frames[i]);
-			nxmit--;
-		}
+		if (ret != MVNETA_XDP_TX)
+			break;
+
+		nxmit_byte += frames[i]->len;
+		nxmit++;
 	}
 
 	if (unlikely(flags & XDP_XMIT_FLUSH))