netdev - [RFC PATCH bpf-next 4/4] i40e: start using xdp

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Message-Id: <20191113204737.31623-5-bjorn.topel@gmail.com>
Date:   Wed, 13 Nov 2019 21:47:37 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        bpf@...r.kernel.org, magnus.karlsson@...il.com,
        magnus.karlsson@...el.com, jonathan.lemon@...il.com
Subject: [RFC PATCH bpf-next 4/4] i40e: start using xdp_call.h

From: Björn Töpel <bjorn.topel@...el.com>

This commit starts using xdp_call.h and the BPF dispatcher to avoid
the retpoline overhead.

Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 5 ++++-
 drivers/net/ethernet/intel/i40e/i40e_xsk.c  | 5 ++++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index b3d7edbb1389..59b530e4198f 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -5,6 +5,7 @@
 #include <linux/of_net.h>
 #include <linux/pci.h>
 #include <linux/bpf.h>
+#include <linux/xdp_call.h>
 
 /* Local includes */
 #include "i40e.h"
@@ -12517,6 +12518,8 @@ static netdev_features_t i40e_features_check(struct sk_buff *skb,
 	return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 }
 
+DEFINE_XDP_CALL(i40e_xdp_call);
+
 /**
  * i40e_xdp_setup - add/remove an XDP program
  * @vsi: VSI to changed
@@ -12552,6 +12555,8 @@ static int i40e_xdp_setup(struct i40e_vsi *vsi,
 	for (i = 0; i < vsi->num_queue_pairs; i++)
 		WRITE_ONCE(vsi->rx_rings[i]->xdp_prog, vsi->xdp_prog);
 
+	xdp_call_update(i40e_xdp_call, old_prog, prog);
+
 	if (old_prog)
 		bpf_prog_put(old_prog);
 
diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index b8496037ef7f..34d7b15897a1 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -3,6 +3,7 @@
 
 #include <linux/prefetch.h>
 #include <linux/bpf_trace.h>
+#include <linux/xdp_call.h>
 #include <net/xdp.h>
 #include "i40e.h"
 #include "i40e_trace.h"
@@ -2188,6 +2189,8 @@ int i40e_xmit_xdp_tx_ring(struct xdp_buff *xdp, struct i40e_ring *xdp_ring)
 	return i40e_xmit_xdp_ring(xdpf, xdp_ring);
 }
 
+DECLARE_XDP_CALL(i40e_xdp_call);
+
 /**
  * i40e_run_xdp - run an XDP program
  * @rx_ring: Rx ring being processed
@@ -2209,7 +2212,7 @@ static struct sk_buff *i40e_run_xdp(struct i40e_ring *rx_ring,
 
 	prefetchw(xdp->data_hard_start); /* xdp_frame write */
 
-	act = bpf_prog_run_xdp(xdp_prog, xdp);
+	act = xdp_call_run(i40e_xdp_call, xdp_prog, xdp);
 	switch (act) {
 	case XDP_PASS:
 		break;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index a05dfecdd9b4..c623eeaeb625 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -2,6 +2,7 @@
 /* Copyright(c) 2018 Intel Corporation. */
 
 #include <linux/bpf_trace.h>
+#include <linux/xdp_call.h>
 #include <net/xdp_sock.h>
 #include <net/xdp.h>
 
@@ -179,6 +180,8 @@ int i40e_xsk_umem_setup(struct i40e_vsi *vsi, struct xdp_umem *umem,
 		i40e_xsk_umem_disable(vsi, qid);
 }
 
+DECLARE_XDP_CALL(i40e_xdp_call);
+
 /**
  * i40e_run_xdp_zc - Executes an XDP program on an xdp_buff
  * @rx_ring: Rx ring
@@ -202,7 +205,7 @@ static int i40e_run_xdp_zc(struct i40e_ring *rx_ring, struct xdp_buff *xdp)
 	 * this path is enabled by setting an XDP program.
 	 */
 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
-	act = bpf_prog_run_xdp(xdp_prog, xdp);
+	act = xdp_call_run(i40e_xdp_call, xdp_prog, xdp);
 	offset = xdp->data - xdp->data_hard_start;
 
 	xdp->handle = xsk_umem_adjust_offset(umem, xdp->handle, offset);
-- 
2.20.1