net: atlantic: Implement xdp control plane

aq_xdp() is a xdp setup callback function for Atlantic driver.
When XDP is attached or detached, the device will be restarted because
it uses different headroom, tailroom, and page order value.

If XDP enabled, it switches default page order value from 0 to 2.
Because the default maximum frame size is still 2K and it needs
additional area for headroom and tailroom.
The total size(headroom + frame size + tailroom) is 2624.
So, 1472Bytes will be always wasted for every frame.
But when order-2 is used, these pages can be used 6 times
with flip strategy.
It means only about 106Bytes per frame will be wasted.

Also, It supports xdp fragment feature.
MTU can be 16K if xdp prog supports xdp fragment.
If not, MTU can not exceed 2K - ETH_HLEN - ETH_FCS.

And a static key is added and It will be used to call the xdp_clean
handler in ->poll(). data plane implementation will be contained
the followed patch.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 6 deletions

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
index 6ab1f3212d24..997f351bc371 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_vec.c
@@ -10,11 +10,6 @@
  */
 
 #include "aq_vec.h"
-#include "aq_nic.h"
-#include "aq_ring.h"
-#include "aq_hw.h"
-
-#include <linux/netdevice.h>
 
 struct aq_vec_s {
 	const struct aq_hw_ops *aq_hw_ops;
@@ -153,9 +148,23 @@ int aq_vec_ring_alloc(struct aq_vec_s *self, struct aq_nic_s *aq_nic,
 
 		aq_nic_set_tx_ring(aq_nic, idx_ring, ring);
 
+		if (xdp_rxq_info_reg(&self->ring[i][AQ_VEC_RX_ID].xdp_rxq,
+				     aq_nic->ndev, idx,
+				     self->napi.napi_id) < 0) {
+			err = -ENOMEM;
+			goto err_exit;
+		}
+		if (xdp_rxq_info_reg_mem_model(&self->ring[i][AQ_VEC_RX_ID].xdp_rxq,
+					       MEM_TYPE_PAGE_ORDER0, NULL) < 0) {
+			xdp_rxq_info_unreg(&self->ring[i][AQ_VEC_RX_ID].xdp_rxq);
+			err = -ENOMEM;
+			goto err_exit;
+		}
+
 		ring = aq_ring_rx_alloc(&self->ring[i][AQ_VEC_RX_ID], aq_nic,
 					idx_ring, aq_nic_cfg);
 		if (!ring) {
+			xdp_rxq_info_unreg(&self->ring[i][AQ_VEC_RX_ID].xdp_rxq);
 			err = -ENOMEM;
 			goto err_exit;
 		}
@@ -300,8 +309,10 @@ void aq_vec_ring_free(struct aq_vec_s *self)
 	for (i = 0U; self->tx_rings > i; ++i) {
 		ring = self->ring[i];
 		aq_ring_free(&ring[AQ_VEC_TX_ID]);
-		if (i < self->rx_rings)
+		if (i < self->rx_rings) {
+			xdp_rxq_info_unreg(&ring[AQ_VEC_RX_ID].xdp_rxq);
 			aq_ring_free(&ring[AQ_VEC_RX_ID]);
+		}
 	}
 
 	self->tx_rings = 0;