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Commit 61b8013a authored Jul 17, 2011 by Srinivas Kandagatla Committed by David S. Miller Jul 18, 2011

stmmac: Allow SOCs to use Store forward mode eventhough tx_coe is 0. (V2)



This patch adds new field 'force_sf_dma_mode' to plat_stmmacenet_data
struct to allow users to specify if they want to use force store forward
eventhough tx_coe is not available in hw.
without this flag stmmac driver will use cut-thru mode not use
store-forward mode.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent eb0dc4bb

drivers/net/stmmac/stmmac_main.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -557,9 +557,11 @@ static void free_dma_desc_resources(struct stmmac_priv *priv)
		*/
		static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
		{
		if (likely((priv->plat->tx_coe) && (!priv->no_csum_insertion))) {
		/* In case of GMAC, SF mode has to be enabled
		* to perform the TX COE. This depends on:
		if (likely(priv->plat->force_sf_dma_mode \|\|
		((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
		/*
		* In case of GMAC, SF mode can be enabled
		* to perform the TX COE in HW. This depends on:
		* 1) TX COE if actually supported
		* 2) There is no bugged Jumbo frame support
		* that needs to not insert csum in the TDES.

include/linux/stmmac.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -40,6 +40,7 @@ struct plat_stmmacenet_data {
		int tx_coe;
		int bugged_jumbo;
		int pmt;
		int force_sf_dma_mode;
		void (fix_mac_speed)(void priv, unsigned int speed);
		void (bus_setup)(void __iomem ioaddr);
		int (init)(struct platform_device pdev);