netdev - [PATCH net-next 2/9] igc: Refactor __igc_xdp_run

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Message-Id: <20210409164351.188953-3-anthony.l.nguyen@intel.com>
Date:   Fri,  9 Apr 2021 09:43:44 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Andre Guedes <andre.guedes@...el.com>, netdev@...r.kernel.org,
        sassmann@...hat.com, anthony.l.nguyen@...el.com,
        bjorn.topel@...el.com, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, sasha.neftin@...el.com,
        vitaly.lifshits@...el.com, Vedang Patel <vedang.patel@...el.com>,
        Jithu Joseph <jithu.joseph@...el.com>,
        Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Subject: [PATCH net-next 2/9] igc: Refactor __igc_xdp_run_prog()

From: Andre Guedes <andre.guedes@...el.com>

Refactor __igc_xdp_run_prog() helper from igc_xdp_run_prog(),
preparing the code for AF_XDP zero-copy support which is added
by upcoming patches.

The existing igc_xdp_run_prog() caters to regular XDP rx path
which has to verify if bpf_prog is not NULL. Zero-copy
path assumes that bpf_prog is not NULL and hence this check is
not required. Therefore it makes sense to refactor the common
code into a helper function, to avoid code duplication.

Signed-off-by: Andre Guedes <andre.guedes@...el.com>
Signed-off-by: Vedang Patel <vedang.patel@...el.com>
Signed-off-by: Jithu Joseph <jithu.joseph@...el.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 56 +++++++++++------------
 1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index eef2e195dd37..86ec04972a64 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -2020,38 +2020,22 @@ static int igc_xdp_xmit_back(struct igc_adapter *adapter, struct xdp_buff *xdp)
 	return res;
 }
 
-static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
-					struct xdp_buff *xdp)
+/* This function assumes rcu_read_lock() is held by the caller. */
+static int __igc_xdp_run_prog(struct igc_adapter *adapter,
+			      struct bpf_prog *prog,
+			      struct xdp_buff *xdp)
 {
-	struct bpf_prog *prog;
-	int res;
-	u32 act;
-
-	rcu_read_lock();
-
-	prog = READ_ONCE(adapter->xdp_prog);
-	if (!prog) {
-		res = IGC_XDP_PASS;
-		goto unlock;
-	}
+	u32 act = bpf_prog_run_xdp(prog, xdp);
 
-	act = bpf_prog_run_xdp(prog, xdp);
 	switch (act) {
 	case XDP_PASS:
-		res = IGC_XDP_PASS;
-		break;
+		return IGC_XDP_PASS;
 	case XDP_TX:
-		if (igc_xdp_xmit_back(adapter, xdp) < 0)
-			res = IGC_XDP_CONSUMED;
-		else
-			res = IGC_XDP_TX;
-		break;
+		return igc_xdp_xmit_back(adapter, xdp) < 0 ?
+			IGC_XDP_CONSUMED : IGC_XDP_TX;
 	case XDP_REDIRECT:
-		if (xdp_do_redirect(adapter->netdev, xdp, prog) < 0)
-			res = IGC_XDP_CONSUMED;
-		else
-			res = IGC_XDP_REDIRECT;
-		break;
+		return xdp_do_redirect(adapter->netdev, xdp, prog) < 0 ?
+			IGC_XDP_CONSUMED : IGC_XDP_REDIRECT;
 	default:
 		bpf_warn_invalid_xdp_action(act);
 		fallthrough;
@@ -2059,9 +2043,25 @@ static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
 		trace_xdp_exception(adapter->netdev, prog, act);
 		fallthrough;
 	case XDP_DROP:
-		res = IGC_XDP_CONSUMED;
-		break;
+		return IGC_XDP_CONSUMED;
 	}
+}
+
+static struct sk_buff *igc_xdp_run_prog(struct igc_adapter *adapter,
+					struct xdp_buff *xdp)
+{
+	struct bpf_prog *prog;
+	int res;
+
+	rcu_read_lock();
+
+	prog = READ_ONCE(adapter->xdp_prog);
+	if (!prog) {
+		res = IGC_XDP_PASS;
+		goto unlock;
+	}
+
+	res = __igc_xdp_run_prog(adapter, prog, xdp);
 
 unlock:
 	rcu_read_unlock();
-- 
2.26.2