i40e: Remove umem from VSI

As current implementation of netdev already contains and provides
umems for us, we no longer have the need to contain these
structures in i40e_vsi.

Refactor the code to operate on netdev-provided umems.

Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -34,6 +34,7 @@
 #include <net/pkt_cls.h>
 #include <net/tc_act/tc_gact.h>
 #include <net/tc_act/tc_mirred.h>
+#include <net/xdp_sock.h>
 #include "i40e_type.h"
 #include "i40e_prototype.h"
 #include "i40e_client.h"
@@ -787,11 +788,6 @@ struct i40e_vsi {
 
 	/* VSI specific handlers */
 	irqreturn_t (*irq_handler)(int irq, void *data);
-
-	/* AF_XDP zero-copy */
-	struct xdp_umem **xsk_umems;
-	u16 num_xsk_umems_used;
-	u16 num_xsk_umems;
 } ____cacheline_internodealigned_in_smp;
 
 struct i40e_netdev_priv {
@@ -1104,10 +1100,10 @@ static inline struct xdp_umem *i40e_xsk_umem(struct i40e_ring *ring)
 	if (ring_is_xdp(ring))
 		qid -= ring->vsi->alloc_queue_pairs;
 
-	if (!ring->vsi->xsk_umems || !ring->vsi->xsk_umems[qid] || !xdp_on)
+	if (!xdp_on)
 		return NULL;
 
-	return ring->vsi->xsk_umems[qid];
+	return xdp_get_umem_from_qid(ring->vsi->netdev, qid);
 }
 
 int i40e_create_queue_channel(struct i40e_vsi *vsi, struct i40e_channel *ch);

drivers/net/ethernet/intel/i40e/i40e_xsk.c

@@ -9,69 +9,6 @@
 #include "i40e_txrx_common.h"
 #include "i40e_xsk.h"
 
-/**
- * i40e_alloc_xsk_umems - Allocate an array to store per ring UMEMs
- * @vsi: Current VSI
- *
- * Returns 0 on success, <0 on failure
- **/
-static int i40e_alloc_xsk_umems(struct i40e_vsi *vsi)
-{
-	if (vsi->xsk_umems)
-		return 0;
-
-	vsi->num_xsk_umems_used = 0;
-	vsi->num_xsk_umems = vsi->alloc_queue_pairs;
-	vsi->xsk_umems = kcalloc(vsi->num_xsk_umems, sizeof(*vsi->xsk_umems),
-				 GFP_KERNEL);
-	if (!vsi->xsk_umems) {
-		vsi->num_xsk_umems = 0;
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-/**
- * i40e_add_xsk_umem - Store a UMEM for a certain ring/qid
- * @vsi: Current VSI
- * @umem: UMEM to store
- * @qid: Ring/qid to associate with the UMEM
- *
- * Returns 0 on success, <0 on failure
- **/
-static int i40e_add_xsk_umem(struct i40e_vsi *vsi, struct xdp_umem *umem,
-			     u16 qid)
-{
-	int err;
-
-	err = i40e_alloc_xsk_umems(vsi);
-	if (err)
-		return err;
-
-	vsi->xsk_umems[qid] = umem;
-	vsi->num_xsk_umems_used++;
-
-	return 0;
-}
-
-/**
- * i40e_remove_xsk_umem - Remove a UMEM for a certain ring/qid
- * @vsi: Current VSI
- * @qid: Ring/qid associated with the UMEM
- **/
-static void i40e_remove_xsk_umem(struct i40e_vsi *vsi, u16 qid)
-{
-	vsi->xsk_umems[qid] = NULL;
-	vsi->num_xsk_umems_used--;
-
-	if (vsi->num_xsk_umems == 0) {
-		kfree(vsi->xsk_umems);
-		vsi->xsk_umems = NULL;
-		vsi->num_xsk_umems = 0;
-	}
-}
-
 /**
  * i40e_xsk_umem_dma_map - DMA maps all UMEM memory for the netdev
  * @vsi: Current VSI
@@ -140,6 +77,7 @@ static void i40e_xsk_umem_dma_unmap(struct i40e_vsi *vsi, struct xdp_umem *umem)
 static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
 				u16 qid)
 {
+	struct net_device *netdev = vsi->netdev;
 	struct xdp_umem_fq_reuse *reuseq;
 	bool if_running;
 	int err;
@@ -150,12 +88,9 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
 	if (qid >= vsi->num_queue_pairs)
 		return -EINVAL;
 
-	if (vsi->xsk_umems) {
-		if (qid >= vsi->num_xsk_umems)
-			return -EINVAL;
-		if (vsi->xsk_umems[qid])
-			return -EBUSY;
-	}
+	if (qid >= netdev->real_num_rx_queues ||
+	    qid >= netdev->real_num_tx_queues)
+		return -EINVAL;
 
 	reuseq = xsk_reuseq_prepare(vsi->rx_rings[0]->count);
 	if (!reuseq)
@@ -173,13 +108,7 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
 		err = i40e_queue_pair_disable(vsi, qid);
 		if (err)
 			return err;
-	}
-
-	err = i40e_add_xsk_umem(vsi, umem, qid);
-	if (err)
-		return err;
 
-	if (if_running) {
 		err = i40e_queue_pair_enable(vsi, qid);
 		if (err)
 			return err;
@@ -197,11 +126,13 @@ static int i40e_xsk_umem_enable(struct i40e_vsi *vsi, struct xdp_umem *umem,
  **/
 static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
 {
+	struct net_device *netdev = vsi->netdev;
+	struct xdp_umem *umem;
 	bool if_running;
 	int err;
 
-	if (!vsi->xsk_umems || qid >= vsi->num_xsk_umems ||
-	    !vsi->xsk_umems[qid])
+	umem = xdp_get_umem_from_qid(netdev, qid);
+	if (!umem)
 		return -EINVAL;
 
 	if_running = netif_running(vsi->netdev) && i40e_enabled_xdp_vsi(vsi);
@@ -212,8 +143,7 @@ static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
 			return err;
 	}
 
-	i40e_xsk_umem_dma_unmap(vsi, vsi->xsk_umems[qid]);
-	i40e_remove_xsk_umem(vsi, qid);
+	i40e_xsk_umem_dma_unmap(vsi, umem);
 
 	if (if_running) {
 		err = i40e_queue_pair_enable(vsi, qid);
@@ -237,20 +167,18 @@ static int i40e_xsk_umem_disable(struct i40e_vsi *vsi, u16 qid)
 int i40e_xsk_umem_query(struct i40e_vsi *vsi, struct xdp_umem **umem,
 			u16 qid)
 {
+	struct net_device *netdev = vsi->netdev;
+	struct xdp_umem *queried_umem;
+
 	if (vsi->type != I40E_VSI_MAIN)
 		return -EINVAL;
 
-	if (qid >= vsi->num_queue_pairs)
-		return -EINVAL;
+	queried_umem = xdp_get_umem_from_qid(netdev, qid);
 
-	if (vsi->xsk_umems) {
-		if (qid >= vsi->num_xsk_umems)
-			return -EINVAL;
-		*umem = vsi->xsk_umems[qid];
-		return 0;
-	}
+	if (!queried_umem)
+		return -EINVAL;
 
-	*umem = NULL;
+	*umem = queried_umem;
 	return 0;
 }
 
@@ -945,13 +873,11 @@ void i40e_xsk_clean_tx_ring(struct i40e_ring *tx_ring)
  **/
 bool i40e_xsk_any_rx_ring_enabled(struct i40e_vsi *vsi)
 {
+	struct net_device *netdev = vsi->netdev;
 	int i;
 
-	if (!vsi->xsk_umems)
-		return false;
-
 	for (i = 0; i < vsi->num_queue_pairs; i++) {
-		if (vsi->xsk_umems[i])
+		if (xdp_get_umem_from_qid(netdev, i))
 			return true;
 	}