netdev - [PATCH 1/4] igb: prepare for AF

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Date: Tue,  4 Jul 2023 11:59:12 +0200
From: Sriram Yagnaraman <sriram.yagnaraman@....tech>
To:
Cc: intel-wired-lan@...ts.osuosl.org, bpf@...r.kernel.org,
        netdev@...r.kernel.org, Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sriram Yagnaraman <sriram.yagnaraman@....tech>
Subject: [PATCH 1/4] igb: prepare for AF_XDP zero-copy support

Remove static qualifiers on the following functions to be able to call
from XSK specific file that is added in the later patches
- igb_xdp_tx_queue_mapping
- igb_xdp_ring_update_tail
- igb_run_xdp
- igb_process_skb_fields

Introduce igb_xdp_is_enabled() to check if an XDP program is assigned to
the device.

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@....tech>
---
 drivers/net/ethernet/intel/igb/igb.h      | 13 +++++++++++++
 drivers/net/ethernet/intel/igb/igb_main.c | 23 ++++++++++++-----------
 2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 015b78144114..94440af6cf4b 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -718,6 +718,8 @@ extern char igb_driver_name[];
 int igb_xmit_xdp_ring(struct igb_adapter *adapter,
 		      struct igb_ring *ring,
 		      struct xdp_frame *xdpf);
+struct igb_ring *igb_xdp_tx_queue_mapping(struct igb_adapter *adapter);
+void igb_xdp_ring_update_tail(struct igb_ring *ring);
 int igb_open(struct net_device *netdev);
 int igb_close(struct net_device *netdev);
 int igb_up(struct igb_adapter *);
@@ -737,6 +739,12 @@ void igb_setup_tctl(struct igb_adapter *);
 void igb_setup_rctl(struct igb_adapter *);
 void igb_setup_srrctl(struct igb_adapter *, struct igb_ring *);
 netdev_tx_t igb_xmit_frame_ring(struct sk_buff *, struct igb_ring *);
+struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
+			    struct igb_ring *rx_ring,
+			    struct xdp_buff *xdp);
+void igb_process_skb_fields(struct igb_ring *rx_ring,
+			    union e1000_adv_rx_desc *rx_desc,
+			    struct sk_buff *skb);
 void igb_alloc_rx_buffers(struct igb_ring *, u16);
 void igb_update_stats(struct igb_adapter *);
 bool igb_has_link(struct igb_adapter *adapter);
@@ -797,6 +805,11 @@ static inline struct netdev_queue *txring_txq(const struct igb_ring *tx_ring)
 	return netdev_get_tx_queue(tx_ring->netdev, tx_ring->queue_index);
 }
 
+static inline bool igb_xdp_is_enabled(struct igb_adapter *adapter)
+{
+	return !!adapter->xdp_prog;
+}
+
 int igb_add_filter(struct igb_adapter *adapter,
 		   struct igb_nfc_filter *input);
 int igb_erase_filter(struct igb_adapter *adapter,
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 9a2561409b06..dadc3d423cfd 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2939,7 +2939,8 @@ static int igb_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 	}
 }
 
-static void igb_xdp_ring_update_tail(struct igb_ring *ring)
+/* This function assumes __netif_tx_lock is held by the caller. */
+void igb_xdp_ring_update_tail(struct igb_ring *ring)
 {
 	/* Force memory writes to complete before letting h/w know there
 	 * are new descriptors to fetch.
@@ -2948,7 +2949,7 @@ static void igb_xdp_ring_update_tail(struct igb_ring *ring)
 	writel(ring->next_to_use, ring->tail);
 }
 
-static struct igb_ring *igb_xdp_tx_queue_mapping(struct igb_adapter *adapter)
+struct igb_ring *igb_xdp_tx_queue_mapping(struct igb_adapter *adapter)
 {
 	unsigned int r_idx = smp_processor_id();
 
@@ -3025,11 +3026,11 @@ static int igb_xdp_xmit(struct net_device *dev, int n,
 		nxmit++;
 	}
 
-	__netif_tx_unlock(nq);
-
 	if (unlikely(flags & XDP_XMIT_FLUSH))
 		igb_xdp_ring_update_tail(tx_ring);
 
+	__netif_tx_unlock(nq);
+
 	return nxmit;
 }
 
@@ -6631,7 +6632,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 	struct igb_adapter *adapter = netdev_priv(netdev);
 	int max_frame = new_mtu + IGB_ETH_PKT_HDR_PAD;
 
-	if (adapter->xdp_prog) {
+	if (igb_xdp_is_enabled(adapter)) {
 		int i;
 
 		for (i = 0; i < adapter->num_rx_queues; i++) {
@@ -8600,9 +8601,9 @@ static struct sk_buff *igb_build_skb(struct igb_ring *rx_ring,
 	return skb;
 }
 
-static struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
-				   struct igb_ring *rx_ring,
-				   struct xdp_buff *xdp)
+struct sk_buff *igb_run_xdp(struct igb_adapter *adapter,
+			    struct igb_ring *rx_ring,
+			    struct xdp_buff *xdp)
 {
 	int err, result = IGB_XDP_PASS;
 	struct bpf_prog *xdp_prog;
@@ -8798,9 +8799,9 @@ static bool igb_cleanup_headers(struct igb_ring *rx_ring,
  *  order to populate the hash, checksum, VLAN, timestamp, protocol, and
  *  other fields within the skb.
  **/
-static void igb_process_skb_fields(struct igb_ring *rx_ring,
-				   union e1000_adv_rx_desc *rx_desc,
-				   struct sk_buff *skb)
+void igb_process_skb_fields(struct igb_ring *rx_ring,
+			    union e1000_adv_rx_desc *rx_desc,
+			    struct sk_buff *skb)
 {
 	struct net_device *dev = rx_ring->netdev;
 
-- 
2.34.1