netdev - [bpf-next V4 PATCH 08/14] nfp: setup xdp_rxq

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Date:   Wed, 03 Jan 2018 11:25:49 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     dsahern@...il.com, Jakub Kicinski <jakub.kicinski@...ronome.com>,
        oss-drivers@...ronome.com,
        Simon Horman <simon.horman@...ronome.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, gospo@...adcom.com, bjorn.topel@...el.com,
        michael.chan@...adcom.com
Subject: [bpf-next V4 PATCH 08/14] nfp: setup xdp_rxq_info

Driver hook points for xdp_rxq_info:
 * reg  : nfp_net_rx_ring_alloc
 * unreg: nfp_net_rx_ring_free

In struct nfp_net_rx_ring moved member @size into a hole on 64-bit.
Thus, the size remaines the same after adding member @xdp_rxq.

Cc: oss-drivers@...ronome.com
Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: Simon Horman <simon.horman@...ronome.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_net.h       |    5 ++++-
 .../net/ethernet/netronome/nfp/nfp_net_common.c    |   10 ++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net.h b/drivers/net/ethernet/netronome/nfp/nfp_net.h
index 3801c52098d5..0e564cfabe7e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net.h
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net.h
@@ -47,6 +47,7 @@
 #include <linux/netdevice.h>
 #include <linux/pci.h>
 #include <linux/io-64-nonatomic-hi-lo.h>
+#include <net/xdp.h>
 
 #include "nfp_net_ctrl.h"
 
@@ -350,6 +351,7 @@ struct nfp_net_rx_buf {
  * @rxds:       Virtual address of FL/RX ring in host memory
  * @dma:        DMA address of the FL/RX ring
  * @size:       Size, in bytes, of the FL/RX ring (needed to free)
+ * @xdp_rxq:    RX-ring info avail for XDP
  */
 struct nfp_net_rx_ring {
 	struct nfp_net_r_vector *r_vec;
@@ -361,13 +363,14 @@ struct nfp_net_rx_ring {
 	u32 idx;
 
 	int fl_qcidx;
+	unsigned int size;
 	u8 __iomem *qcp_fl;
 
 	struct nfp_net_rx_buf *rxbufs;
 	struct nfp_net_rx_desc *rxds;
 
 	dma_addr_t dma;
-	unsigned int size;
+	struct xdp_rxq_info xdp_rxq;
 } ____cacheline_aligned;
 
 /**
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 0add4870ce2e..45b8cae937be 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1608,11 +1608,13 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 	unsigned int true_bufsz;
 	struct sk_buff *skb;
 	int pkts_polled = 0;
+	struct xdp_buff xdp;
 	int idx;
 
 	rcu_read_lock();
 	xdp_prog = READ_ONCE(dp->xdp_prog);
 	true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
+	xdp.rxq = &rx_ring->xdp_rxq;
 	tx_ring = r_vec->xdp_ring;
 
 	while (pkts_polled < budget) {
@@ -1703,7 +1705,6 @@ static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
 				  dp->bpf_offload_xdp) && !meta.portid) {
 			void *orig_data = rxbuf->frag + pkt_off;
 			unsigned int dma_off;
-			struct xdp_buff xdp;
 			int act;
 
 			xdp.data_hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM;
@@ -2252,6 +2253,7 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
 	struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
 	struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
 
+	xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
 	kfree(rx_ring->rxbufs);
 
 	if (rx_ring->rxds)
@@ -2275,7 +2277,11 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
 static int
 nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring)
 {
-	int sz;
+	int sz, err;
+
+	err = xdp_rxq_info_reg(&rx_ring->xdp_rxq, dp->netdev, rx_ring->idx);
+	if (err < 0)
+		return err;
 
 	rx_ring->cnt = dp->rxd_cnt;
 	rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;