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net: stmmac: don't set own bit too early for jumbo frames 

Commit 0e80bdc9a7 ("stmmac: first frame prep at the end of xmit
routine") overlooked jumbo frames when re-ordering the code, and as a
result the own bit was not getting set anymore for the first jumbo frame
descriptor. Commit 487e2e22ab ("net: stmmac: Set OWN bit for jumbo
frames") tried to fix this, but now the bit is getting set too early and
the DMA may start while we are still setting up the remaining descriptors.
And with the chain mode the own bit remains still unset.

Fix by setting the own bit at the end of xmit also with jumbo frames.

Fixes: 0e80bdc9a7 ("stmmac: first frame prep at the end of xmit routine")
Fixes: 487e2e22ab ("net: stmmac: Set OWN bit for jumbo frames")
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aaro Koskinen 2019-03-14 21:43:19 +02:00 committed by David S. Miller
parent 9804501fa1
commit 80acbed9f8
2 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/ethernet/stmicro/stmmac/ring_mode.c
View File

@ -59,7 +59,7 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);
stmmac_prepare_tx_desc(priv, desc, 1, bmax, csum,
STMMAC_RING_MODE, 1, false, skb->len);
STMMAC_RING_MODE, 0, false, skb->len);
tx_q->tx_skbuff[entry] = NULL;
entry = STMMAC_GET_ENTRY(entry, DMA_TX_SIZE);
@ -91,7 +91,7 @@ static int jumbo_frm(void *p, struct sk_buff *skb, int csum)
tx_q->tx_skbuff_dma[entry].is_jumbo = true;
desc->des3 = cpu_to_le32(des2 + BUF_SIZE_4KiB);
stmmac_prepare_tx_desc(priv, desc, 1, nopaged_len, csum,
STMMAC_RING_MODE, 1, true, skb->len);
STMMAC_RING_MODE, 0, true, skb->len);
}
tx_q->cur_tx = entry;

14
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -3216,14 +3216,16 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
stmmac_prepare_tx_desc(priv, first, 1, nopaged_len,
csum_insertion, priv->mode, 1, last_segment,
skb->len);
/* The own bit must be the latest setting done when prepare the
* descriptor and then barrier is needed to make sure that
* all is coherent before granting the DMA engine.
*/
wmb();
} else {
stmmac_set_tx_owner(priv, first);
}
/* The own bit must be the latest setting done when prepare the
* descriptor and then barrier is needed to make sure that
* all is coherent before granting the DMA engine.
*/
wmb();
netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
stmmac_enable_dma_transmission(priv, priv->ioaddr);