From: troy.kisky@boundarydevices•com (Troy Kisky)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH net-next V2 07/16] net: fec: set cbd_sc without relying on previous value
Date: Fri, 4 Mar 2016 09:08:07 -0700 [thread overview]
Message-ID: <56D9B2E7.6050000@boundarydevices.com> (raw)
In-Reply-To: <VI1PR0401MB18552747CE0E0FF2C7E0E4C5FFBE0@VI1PR0401MB1855.eurprd04.prod.outlook.com>
On 3/4/2016 2:29 AM, Fugang Duan wrote:
> From: Troy Kisky <troy.kisky@boundarydevices•com> Sent: Thursday, February 25, 2016 8:37 AM
>> To: netdev at vger.kernel.org; davem at davemloft.net; b38611 at freescale.com
>> Cc: fabio.estevam at freescale.com; l.stach at pengutronix.de; andrew at lunn.ch;
>> tremyfr at gmail.com; linux at arm.linux.org.uk; linux-arm-
>> kernel at lists.infradead.org; laci at boundarydevices.com; shawnguo at kernel.org;
>> johannes at sipsolutions.net; stillcompiling at gmail.com;
>> sergei.shtylyov at cogentembedded.com; arnd at arndb.de; Troy Kisky
>> <troy.kisky@boundarydevices•com>
>> Subject: [PATCH net-next V2 07/16] net: fec: set cbd_sc without relying on
>> previous value
>>
>> Relying on the wrap bit to stay valid once initialized when the controller also
>> writes to this byte seems undesirable since we can easily know what the value
>> should be.
>>
>> Signed-off-by: Troy Kisky <troy.kisky@boundarydevices•com>
>> ---
>> drivers/net/ethernet/freescale/fec_main.c | 38 +++++++++----------------------
>> 1 file changed, 11 insertions(+), 27 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/freescale/fec_main.c
>> b/drivers/net/ethernet/freescale/fec_main.c
>> index 791f385..6ceb5f9 100644
>> --- a/drivers/net/ethernet/freescale/fec_main.c
>> +++ b/drivers/net/ethernet/freescale/fec_main.c
>> @@ -340,9 +340,8 @@ fec_enet_txq_submit_frag_skb(struct
>> fec_enet_priv_tx_q *txq,
>> bdp = fec_enet_get_nextdesc(bdp, &txq->bd);
>> ebdp = (struct bufdesc_ex *)bdp;
>>
>> - status = fec16_to_cpu(bdp->cbd_sc);
>> - status &= ~BD_ENET_TX_STATS;
>> - status |= (BD_ENET_TX_TC | BD_ENET_TX_READY);
>> + status = BD_ENET_TX_TC | BD_ENET_TX_READY |
>> + ((bdp == txq->bd.last) ? BD_SC_WRAP : 0);
>> frag_len = skb_shinfo(skb)->frags[frag].size;
>>
>> /* Handle the last BD specially */
>> @@ -436,8 +435,6 @@ static int fec_enet_txq_submit_skb(struct
>> fec_enet_priv_tx_q *txq,
>> /* Fill in a Tx ring entry */
>> bdp = txq->bd.cur;
>> last_bdp = bdp;
>> - status = fec16_to_cpu(bdp->cbd_sc);
>> - status &= ~BD_ENET_TX_STATS;
>>
>> /* Set buffer length and buffer pointer */
>> bufaddr = skb->data;
>> @@ -462,6 +459,8 @@ static int fec_enet_txq_submit_skb(struct
>> fec_enet_priv_tx_q *txq,
>> return NETDEV_TX_OK;
>> }
>>
>> + status = BD_ENET_TX_TC | BD_ENET_TX_READY |
>> + ((bdp == txq->bd.last) ? BD_SC_WRAP : 0);
>> if (nr_frags) {
>> last_bdp = fec_enet_txq_submit_frag_skb(txq, skb, ndev);
>> if (IS_ERR(last_bdp)) {
>> @@ -512,7 +511,6 @@ static int fec_enet_txq_submit_skb(struct
>> fec_enet_priv_tx_q *txq,
>> /* Send it on its way. Tell FEC it's ready, interrupt when done,
>> * it's the last BD of the frame, and to put the CRC on the end.
>> */
>> - status |= (BD_ENET_TX_READY | BD_ENET_TX_TC);
>
> This is completely error. We have to prepare all BDs for frag skb, and then enable "READY" and "TC" bit for the first BD, otherwise uDMA copy un-correct data to fifo.
>
I don't follow. Please read patch again.
Thanks
Troy
next prev parent reply other threads:[~2016-03-04 16:08 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 0:36 [PATCH net-next V2 00/16] net: fec: cleanup and fixes Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 01/16] net: fec: only check queue 0 if RXF_0/TXF_0 interrupt is set Troy Kisky
2016-03-02 14:57 ` Fugang Duan
2016-02-25 0:36 ` [PATCH net-next V2 02/16] net: fec: pass rxq to fec_enet_rx_queue instead of queue_id Troy Kisky
2016-03-01 21:05 ` Zhi Li
2016-03-02 15:01 ` Fugang Duan
2016-02-25 0:36 ` [PATCH net-next V2 03/16] net: fec: pass txq to fec_enet_tx_queue " Troy Kisky
2016-03-01 21:06 ` Zhi Li
2016-03-01 21:51 ` Troy Kisky
2016-03-01 22:26 ` Zhi Li
2016-03-01 22:43 ` Troy Kisky
2016-03-02 15:16 ` Fugang Duan
2016-03-02 16:13 ` Troy Kisky
2016-03-04 7:41 ` Fugang Duan
2016-03-04 16:23 ` Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 04/16] net: fec: reduce interrupts Troy Kisky
2016-03-02 15:13 ` Fugang Duan
2016-03-02 16:12 ` Troy Kisky
2016-03-02 16:44 ` Zhi Li
2016-03-02 16:47 ` Zhi Li
2016-03-02 22:32 ` Troy Kisky
2016-03-02 22:52 ` Zhi Li
2016-03-04 8:58 ` Fugang Duan
2016-02-25 0:36 ` [PATCH net-next V2 05/16] net: fec: split off napi routine with 3 queues Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 06/16] net: fec: don't clear all rx queue bits when just one is being checked Troy Kisky
2016-03-04 9:11 ` Fugang Duan
2016-03-04 16:18 ` Troy Kisky
2016-03-04 16:38 ` Russell King - ARM Linux
2016-03-04 17:28 ` Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 07/16] net: fec: set cbd_sc without relying on previous value Troy Kisky
2016-03-04 9:29 ` Fugang Duan
2016-03-04 16:08 ` Troy Kisky [this message]
2016-03-05 23:55 ` Fugang Duan
2016-02-25 0:36 ` [PATCH net-next V2 08/16] net: fec: eliminate calls to fec_enet_get_prevdesc Troy Kisky
2016-03-04 9:33 ` Fugang Duan
2016-03-04 16:05 ` Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 09/16] net: fec: move restart test for efficiency Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 10/16] net: fec: clear cbd_sc after transmission to help with debugging Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 11/16] net: fec: dump all tx queues in fec_dump Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 12/16] net: fec: detect tx int lost Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 13/16] net: fec: print more debug info in fec_timeout Troy Kisky
2016-03-04 10:06 ` Fugang Duan
2016-03-04 16:05 ` Troy Kisky
2016-03-04 17:35 ` Joe Perches
2016-03-04 19:06 ` Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 14/16] net: fec: create subroutine reset_tx_queue Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 15/16] net: fec: call dma_unmap_single on mapped tx buffers at restart Troy Kisky
2016-02-25 0:36 ` [PATCH net-next V2 16/16] net: fec: don't set cbd_bufaddr unless no mapping error Troy Kisky
2016-02-25 2:52 ` [PATCH net-next V2 00/16] net: fec: cleanup and fixes Joshua Clayton
2016-02-25 16:05 ` Troy Kisky
2016-02-25 16:49 ` Joshua Clayton
2016-02-25 8:39 ` Holger Schurig
2016-02-25 15:57 ` Troy Kisky
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