netdev - [net-next 2/5] stmmac: allow mtu bigger than 1500 in case of normal desc.

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Message-Id: <1318318246-1326-3-git-send-email-peppe.cavallaro@st.com>
Date:	Tue, 11 Oct 2011 09:30:43 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	netdev@...r.kernel.org
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Deepak SIKRI <deepak.sikri@...com>
Subject: [net-next 2/5] stmmac: allow mtu bigger than 1500 in case of normal desc.

This patch allows to set the mtu bigger than 1500
in case of normal descriptors.
This is helping some SPEAr customers.

Signed-off-by: Deepak SIKRI <deepak.sikri@...com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
---
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c   |   10 +++++++++-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    6 +++---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index 6c40a38..c3456f8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -127,6 +127,7 @@ static void ndesc_init_rx_desc(struct dma_desc *p, unsigned int ring_size,
 		p->des01.rx.own = 1;
 		p->des01.rx.buffer1_size = BUF_SIZE_2KiB - 1;
 #if defined(CONFIG_STMMAC_RING)
+		p->des01.rx.buffer2_size = BUF_SIZE_2KiB - 1;
 		if (i == (ring_size - 1))
 			p->des01.rx.end_ring = 1;
 #else
@@ -196,7 +197,14 @@ static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 				  int csum_flag)
 {
 	p->des01.tx.first_segment = is_fs;
-	p->des01.tx.buffer1_size = len;
+
+#if defined(CONFIG_STMMAC_RING)
+	if (unlikely(len > BUF_SIZE_2KiB)) {
+		p->des01.etx.buffer1_size = BUF_SIZE_2KiB - 1;
+		p->des01.etx.buffer2_size = len - p->des01.etx.buffer1_size;
+	} else
+#endif
+		p->des01.tx.buffer1_size = len;
 }
 
 static void ndesc_clear_tx_ic(struct dma_desc *p)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 54f1e76..0a7d326 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1491,17 +1491,17 @@ static void stmmac_set_rx_mode(struct net_device *dev)
 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
-	int max_mtu;
+	int max_mtu = ETH_DATA_LEN;
 
 	if (netif_running(dev)) {
 		pr_err("%s: must be stopped to change its MTU\n", dev->name);
 		return -EBUSY;
 	}
 
-	if (priv->plat->has_gmac)
+	if (priv->plat->enh_desc)
 		max_mtu = JUMBO_LEN;
 	else
-		max_mtu = ETH_DATA_LEN;
+		max_mtu = BUF_SIZE_4KiB;
 
 	if ((new_mtu < 46) || (new_mtu > max_mtu)) {
 		pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
-- 
1.7.4.4

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