net: stmmac: set MSS for each tx DMA channel

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The DMA engine in dwmac4 can segment a large TSO packet to several
smaller packets of (max) size Maximum Segment Size (MSS).

The DMA engine fetches and saves the MSS via a context descriptor.

This context decriptor has to be provided to each tx DMA channel.
To ensure that this is done, move struct member mss from stmmac_priv
to stmmac_tx_queue.

stmmac_reset_queues_param() now also resets mss, together with other
queue parameters, so reset of mss value can be removed from
stmmac_resume().

init_dma_tx_desc_rings() now also resets mss, together with other
queue parameters, so reset of mss value can be removed from
stmmac_open().

This fixes tx queue timeouts for dwmac4, with DT property
snps,tx-queues-to-use > 1, when running iperf3 with multiple threads.

Fixes: ce736788e8 ("net: stmmac: adding multiple buffers for TX")
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Niklas Cassel 2018-02-19 18:11:09 +01:00 • committed by David S. Miller

parent 3fef2b6290

commit 8d212a9ea6

2 changed files with 6 additions and 9 deletions

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2

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

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13

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

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