stmmac: consolidate and tidy-up the COE support

The first version of the driver had hard-coded the logic
for handling the checksum offloading.
This was designed according to the chips included in
the STM platforms where:
o MAC10/100 supports no COE at all.
o GMAC fully supports RX/TX COE.

This is not good for other chip configurations where,
for example, the mac10/100 supports the tx csum in HW
or when the GMAC has no IPC.

Thanks to Johannes Stezenbach; he provided me a first
draft of this patch that only reviewed the IPC for the
GMAC devices.

This patch also helps on SPEAr platforms where the
MAC10/100 can perform the TX csum in HW.
Thanks to Deepak SIKRI for his support on this.

In the end, GMAC devices for STM platforms have
a bugged Jumbo frame support that needs to have
the Tx COE disabled for oversized frames (due to
limited buffer sizes). This information is also
passed through the driver's platform structure.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Johannes Stezenbach <js@sig21.net>
Signed-off-by: Deepak SIKRI <deepak.sikri@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index c87c88ccffc0..1d8baf719211 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -35,6 +35,8 @@ struct plat_stmmacenet_data {
         int clk_csr;
         int has_gmac;
         int enh_desc;
+        int tx_coe;
+        int bugged_jumbo;
         void (*fix_mac_speed)(void *priv, unsigned int speed);
         void (*bus_setup)(void __iomem *ioaddr);
 #ifdef CONFIG_STM_DRIVERS