diff mbox series

[net-next,07/11] ice: skip NULL check against XDP prog in ZC path

Message ID 20210212223952.1172568-8-anthony.l.nguyen@intel.com (mailing list archive)
State Accepted
Commit 5c57e507f247ece4d2190f17446850e5a3fa6cf4
Delegated to: Netdev Maintainers
Headers show
Series 40GbE Intel Wired LAN Driver Updates 2021-02-12 | expand

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Context Check Description
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netdev/tree_selection success Clearly marked for net-next
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netdev/cc_maintainers warning 7 maintainers not CCed: intel-wired-lan@lists.osuosl.org hawk@kernel.org ast@kernel.org daniel@iogearbox.net john.fastabend@gmail.com bpf@vger.kernel.org jesse.brandeburg@intel.com
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 14 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
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netdev/stable success Stable not CCed

Commit Message

Tony Nguyen Feb. 12, 2021, 10:39 p.m. UTC 
From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

Whole zero-copy variant of clean Rx IRQ is executed when xsk_pool is
attached to rx_ring and it can happen only when XDP program is present
on interface. Therefore it is safe to assume that program is always
!NULL and there is no need for checking it in ice_run_xdp_zc.

Reviewed-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Kiran Bhandare <kiranx.bhandare@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 875fa0cbef56..83f3c9574ed1 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -467,11 +467,10 @@  ice_run_xdp_zc(struct ice_ring *rx_ring, struct xdp_buff *xdp)
 	u32 act;
 
 	rcu_read_lock();
+	/* ZC patch is enabled only when XDP program is set,
+	 * so here it can not be NULL
+	 */
 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
-	if (!xdp_prog) {
-		rcu_read_unlock();
-		return ICE_XDP_PASS;
-	}
 
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 	switch (act) {