nfp: use dp to carry number of stack tx rings and vectors

Instead of passing variables around use dp to store number of tx rings
for the stack and number of IRQ vectors.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net_common.c

@@ -1786,8 +1786,7 @@ err_alloc:
 
 static struct nfp_net_tx_ring *
 nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_dp *dp,
-			    struct nfp_net_ring_set *s,
-			    unsigned int num_stack_tx_rings)
+			    struct nfp_net_ring_set *s)
 {
 	struct nfp_net_tx_ring *rings;
 	unsigned int r;
@@ -1799,8 +1798,8 @@ nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_dp *dp,
 	for (r = 0; r < s->n_rings; r++) {
 		int bias = 0;
 
-		if (r >= num_stack_tx_rings)
-			bias = num_stack_tx_rings;
+		if (r >= dp->num_stack_tx_rings)
+			bias = dp->num_stack_tx_rings;
 
 		nfp_net_tx_ring_init(&rings[r], &nn->r_vecs[r - bias], r);
 
@@ -2304,8 +2303,7 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		goto err_cleanup_vec;
 	}
 
-	nn->dp.tx_rings = nfp_net_tx_ring_set_prepare(nn, &nn->dp, &tx,
-						      nn->dp.num_stack_tx_rings);
+	nn->dp.tx_rings = nfp_net_tx_ring_set_prepare(nn, &nn->dp, &tx);
 	if (!nn->dp.tx_rings) {
 		err = -ENOMEM;
 		goto err_free_rx_rings;
@@ -2466,10 +2464,16 @@ static void nfp_net_rss_init_itbl(struct nfp_net *nn)
 			ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings);
 }
 
+static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp)
+{
+	struct nfp_net_dp new_dp = *dp;
+
+	*dp = nn->dp;
+	nn->dp = new_dp;
+}
+
 static int
 nfp_net_ring_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp,
-			 unsigned int *num_vecs,
-			 unsigned int *stack_tx_rings,
 			 struct bpf_prog **xdp_prog,
 			 struct nfp_net_ring_set *rx,
 			 struct nfp_net_ring_set *tx)
@@ -2482,8 +2486,8 @@ nfp_net_ring_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp,
 	if (tx)
 		nfp_net_tx_ring_set_swap(nn, tx);
 
-	swap(*num_vecs, nn->dp.num_r_vecs);
-	swap(*stack_tx_rings, nn->dp.num_stack_tx_rings);
+	swap(dp->num_r_vecs, nn->dp.num_r_vecs);
+	swap(dp->num_stack_tx_rings, nn->dp.num_stack_tx_rings);
 	*xdp_prog = xchg(&nn->dp.xdp_prog, *xdp_prog);
 
 	for (r = 0; r <	nn->max_r_vecs; r++)
@@ -2550,17 +2554,16 @@ static void
 nfp_net_ring_reconfig_down(struct nfp_net *nn, struct nfp_net_dp *dp,
 			   struct bpf_prog **xdp_prog,
 			   struct nfp_net_ring_set *rx,
-			   struct nfp_net_ring_set *tx,
-			   unsigned int stack_tx_rings, unsigned int num_vecs)
+			   struct nfp_net_ring_set *tx)
 {
+	nfp_net_dp_swap(nn, dp);
+
 	nn->dp.netdev->mtu = rx ? rx->mtu : nn->dp.netdev->mtu;
 	nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp, nn->dp.netdev->mtu);
 	nn->dp.rxd_cnt = rx ? rx->dcnt : nn->dp.rxd_cnt;
 	nn->dp.txd_cnt = tx ? tx->dcnt : nn->dp.txd_cnt;
 	nn->dp.num_rx_rings = rx ? rx->n_rings : nn->dp.num_rx_rings;
 	nn->dp.num_tx_rings = tx ? tx->n_rings : nn->dp.num_tx_rings;
-	nn->dp.num_stack_tx_rings = stack_tx_rings;
-	nn->dp.num_r_vecs = num_vecs;
 	*xdp_prog = xchg(&nn->dp.xdp_prog, *xdp_prog);
 
 	if (!netif_is_rxfh_configured(nn->dp.netdev))
@@ -2572,31 +2575,31 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp,
 		      struct bpf_prog **xdp_prog,
 		      struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx)
 {
-	unsigned int stack_tx_rings, num_vecs, r;
-	int err;
+	int r, err;
 
-	stack_tx_rings = tx ? tx->n_rings : dp->num_tx_rings;
+	dp->num_stack_tx_rings = tx ? tx->n_rings : dp->num_tx_rings;
 	if (*xdp_prog)
-		stack_tx_rings -= rx ? rx->n_rings : dp->num_rx_rings;
+		dp->num_stack_tx_rings -= rx ? rx->n_rings : dp->num_rx_rings;
 
-	num_vecs = max(rx ? rx->n_rings : dp->num_rx_rings, stack_tx_rings);
+	dp->num_r_vecs = max(rx ? rx->n_rings : dp->num_rx_rings,
+			     dp->num_stack_tx_rings);
 
 	err = nfp_net_check_config(nn, dp, *xdp_prog, rx, tx);
 	if (err)
 		goto exit_free_dp;
 
 	if (!netif_running(dp->netdev)) {
-		nfp_net_ring_reconfig_down(nn, dp, xdp_prog, rx, tx,
-					   stack_tx_rings, num_vecs);
+		nfp_net_ring_reconfig_down(nn, dp, xdp_prog, rx, tx);
+
 		err = 0;
 		goto exit_free_dp;
 	}
 
 	/* Prepare new rings */
-	for (r = nn->dp.num_r_vecs; r < num_vecs; r++) {
+	for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) {
 		err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
 		if (err) {
-			num_vecs = r;
+			dp->num_r_vecs = r;
 			goto err_cleanup_vecs;
 		}
 	}
@@ -2607,7 +2610,7 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp,
 		}
 	}
 	if (tx) {
-		if (!nfp_net_tx_ring_set_prepare(nn, dp, tx, stack_tx_rings)) {
+		if (!nfp_net_tx_ring_set_prepare(nn, dp, tx)) {
 			err = -ENOMEM;
 			goto err_free_rx;
 		}
@@ -2617,22 +2620,19 @@ nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp,
 	nfp_net_close_stack(nn);
 	nfp_net_clear_config_and_disable(nn);
 
-	err = nfp_net_ring_swap_enable(nn, dp, &num_vecs, &stack_tx_rings,
-				       xdp_prog, rx, tx);
+	err = nfp_net_ring_swap_enable(nn, dp, xdp_prog, rx, tx);
 	if (err) {
 		int err2;
 
 		nfp_net_clear_config_and_disable(nn);
 
 		/* Try with old configuration and old rings */
-		err2 = nfp_net_ring_swap_enable(nn, dp, &num_vecs,
-						&stack_tx_rings,
-						xdp_prog, rx, tx);
+		err2 = nfp_net_ring_swap_enable(nn, dp, xdp_prog, rx, tx);
 		if (err2)
 			nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
 			       err, err2);
 	}
-	for (r = num_vecs - 1; r >= nn->dp.num_r_vecs; r--)
+	for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
 
 	if (rx)
@@ -2650,7 +2650,7 @@ err_free_rx:
 	if (rx)
 		nfp_net_rx_ring_set_free(dp, rx, *xdp_prog);
 err_cleanup_vecs:
-	for (r = num_vecs - 1; r >= nn->dp.num_r_vecs; r--)
+	for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
 		nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
 	kfree(dp);
 	return err;