diff mbox series

[net-next,2/3] ixgbe: optimize for XDP_REDIRECT in xsk path

Message ID 20201202150724.31439-3-magnus.karlsson@gmail.com (mailing list archive)
State Awaiting Upstream
Delegated to: Netdev Maintainers
Headers show
Series i40e, ice, ixgbe: optimize for XDP_REDIRECT in xsk path | expand

Checks

Context Check Description
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netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
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
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 23 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/header_inline success Link
netdev/stable success Stable not CCed

Commit Message

Magnus Karlsson Dec. 2, 2020, 3:07 p.m. UTC 
From: Magnus Karlsson <magnus.karlsson@intel.com>

Optimize ixgbe_run_xdp_zc() for the XDP program verdict being
XDP_REDIRECT in the zsk zero-copy path. This path is only used when
having AF_XDP zero-copy on and in that case most packets will be
directed to user space. This provides a little under 100k extra
packets in throughput on my server when running l2fwd in xdpsock.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

Comments

Jambekar, Vishakha March 10, 2021, 4:19 a.m. UTC | #1 
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Magnus Karlsson
> Sent: Wednesday, December 2, 2020 8:37 PM
> To: Karlsson, Magnus <magnus.karlsson@intel.com>; Topel, Bjorn
> <bjorn.topel@intel.com>; intel-wired-lan@lists.osuosl.org; Nguyen, Anthony L
> <anthony.l.nguyen@intel.com>
> Cc: netdev@vger.kernel.org; maciejromanfijalkowski@gmail.com
> Subject: [Intel-wired-lan] [PATCH net-next 2/3] ixgbe: optimize for
> XDP_REDIRECT in xsk path
> 
> From: Magnus Karlsson <magnus.karlsson@intel.com>
> 
> Optimize ixgbe_run_xdp_zc() for the XDP program verdict being XDP_REDIRECT
> in the zsk zero-copy path. This path is only used when having AF_XDP zero-copy
> on and in that case most packets will be directed to user space. This provides a
> little under 100k extra packets in throughput on my server when running l2fwd in
> xdpsock.
> 
> Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
Tested-by: Vishakha Jambekar <vishakha.jambekar@intel.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index 3771857cf887..91ad5b902673 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -104,6 +104,13 @@  static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
 	xdp_prog = READ_ONCE(rx_ring->xdp_prog);
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 
+	if (likely(act == XDP_REDIRECT)) {
+		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
+		result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
+		rcu_read_unlock();
+		return result;
+	}
+
 	switch (act) {
 	case XDP_PASS:
 		break;
@@ -115,10 +122,6 @@  static int ixgbe_run_xdp_zc(struct ixgbe_adapter *adapter,
 		}
 		result = ixgbe_xmit_xdp_ring(adapter, xdpf);
 		break;
-	case XDP_REDIRECT:
-		err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
-		result = !err ? IXGBE_XDP_REDIR : IXGBE_XDP_CONSUMED;
-		break;
 	default:
 		bpf_warn_invalid_xdp_action(act);
 		fallthrough;