netdev - [PATCH v4 net-next 14/15] nfp: pass ring count as function parameter

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Message-Id: <1459544811-24879-15-git-send-email-jakub.kicinski@netronome.com>
Date:	Fri,  1 Apr 2016 22:06:50 +0100
From:	Jakub Kicinski <jakub.kicinski@...ronome.com>
To:	netdev@...r.kernel.org
Cc:	Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH v4 net-next 14/15] nfp: pass ring count as function parameter

Soon ring resize will call this functions with values
different than the current configuration we need to
explicitly pass the ring count as parameter.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
---
 .../net/ethernet/netronome/nfp/nfp_net_common.c    | 23 +++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 33001ce1d8bf..631168a1971e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -1408,17 +1408,18 @@ static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
 /**
  * nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
  * @tx_ring:   TX Ring structure to allocate
+ * @cnt:       Ring buffer count
  *
  * Return: 0 on success, negative errno otherwise.
  */
-static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring)
+static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt)
 {
 	struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 	int sz;
 
-	tx_ring->cnt = nn->txd_cnt;
+	tx_ring->cnt = cnt;
 
 	tx_ring->size = sizeof(*tx_ring->txds) * tx_ring->cnt;
 	tx_ring->txds = dma_zalloc_coherent(&pdev->dev, tx_ring->size,
@@ -1471,18 +1472,20 @@ static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
  * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
  * @rx_ring:  RX ring to allocate
  * @fl_bufsz: Size of buffers to allocate
+ * @cnt:      Ring buffer count
  *
  * Return: 0 on success, negative errno otherwise.
  */
 static int
-nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz)
+nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz,
+		      u32 cnt)
 {
 	struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
 	struct nfp_net *nn = r_vec->nfp_net;
 	struct pci_dev *pdev = nn->pdev;
 	int sz;
 
-	rx_ring->cnt = nn->rxd_cnt;
+	rx_ring->cnt = cnt;
 	rx_ring->bufsz = fl_bufsz;
 
 	rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
@@ -1508,7 +1511,8 @@ err_alloc:
 }
 
 static struct nfp_net_rx_ring *
-nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz)
+nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz,
+				u32 buf_cnt)
 {
 	struct nfp_net_rx_ring *rings;
 	unsigned int r;
@@ -1520,7 +1524,7 @@ nfp_net_shadow_rx_rings_prepare(struct nfp_net *nn, unsigned int fl_bufsz)
 	for (r = 0; r < nn->num_rx_rings; r++) {
 		nfp_net_rx_ring_init(&rings[r], nn->rx_rings[r].r_vec, r);
 
-		if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz))
+		if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz, buf_cnt))
 			goto err_free_prev;
 
 		if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r]))
@@ -1879,12 +1883,12 @@ static int nfp_net_netdev_open(struct net_device *netdev)
 		if (err)
 			goto err_free_prev_vecs;
 
-		err = nfp_net_tx_ring_alloc(nn->r_vecs[r].tx_ring);
+		err = nfp_net_tx_ring_alloc(nn->r_vecs[r].tx_ring, nn->txd_cnt);
 		if (err)
 			goto err_cleanup_vec_p;
 
 		err = nfp_net_rx_ring_alloc(nn->r_vecs[r].rx_ring,
-					    nn->fl_bufsz);
+					    nn->fl_bufsz, nn->rxd_cnt);
 		if (err)
 			goto err_free_tx_ring_p;
 
@@ -2065,7 +2069,8 @@ static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
 	}
 
 	/* Prepare new rings */
-	tmp_rings = nfp_net_shadow_rx_rings_prepare(nn, new_fl_bufsz);
+	tmp_rings = nfp_net_shadow_rx_rings_prepare(nn, new_fl_bufsz,
+						    nn->rxd_cnt);
 	if (!tmp_rings)
 		return -ENOMEM;
 
-- 
1.9.1