stmmac: first frame prep at the end of xmit routine

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This patch is to fill the first descriptor just before granting
the DMA engine so at the end of the xmit.
The patch takes care about the algorithm adopted to mitigate the
interrupts, then it fixes the last segment in case of no fragments.
Moreover, this new implementation does not pass any "ter" field when
prepare the descriptors because this is not necessary.
The patch also details the memory barrier in the xmit.

As final results, this patch guarantees the same performances
but fixing a case if small datagram are sent. In fact, this
kind of test is impacted if no coalesce is done.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Giuseppe Cavallaro 2016-02-29 14:27:38 +01:00 • committed by David S. Miller

parent fbc80823a9

commit 0e80bdc9a7

6 changed files with 95 additions and 78 deletions

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6

drivers/net/ethernet/stmicro/stmmac/common.h

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25

drivers/net/ethernet/stmicro/stmmac/enh_desc.c

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24

drivers/net/ethernet/stmicro/stmmac/norm_desc.c

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2

drivers/net/ethernet/stmicro/stmmac/ring_mode.c

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2

drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c

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114

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

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