stmmac: optimize tx clean function

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This patch "inline" get_tx_owner and get_ls routines. It Results in a
unique read to tdes0, instead of three, to check TX_OWN and LS bits,
and other status bits.

It helps improve driver TX path by removing two uncached read/writes
inside TX clean loop for enhanced descriptors but not for normal ones
because the des1 must be read in any case.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Acked-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:

Fabrice Gasnier 2016-02-29 14:27:36 +01:00 • committed by David S. Miller

parent be434d5075

commit c363b6586c

4 changed files with 42 additions and 18 deletions

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8

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

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12

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

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13

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

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27

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

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