From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: netdev@vger.kernel.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: [PATCH v2 08/12] ftgmac100: Move the barrier out of ftgmac100_txdes_set_dma_own()
Date: Mon, 10 Apr 2017 11:15:22 +1000 [thread overview]
Message-ID: <20170410011526.4509-9-benh@kernel.crashing.org> (raw)
In-Reply-To: <20170410011526.4509-1-benh@kernel.crashing.org>
We'll use variants of this accessor without barriers when
building series of descriptors for fragmented sends
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
drivers/net/ethernet/faraday/ftgmac100.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 8078d65..bdec14f 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -483,11 +483,6 @@ static bool ftgmac100_txdes_owned_by_dma(struct ftgmac100_txdes *txdes)
static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes)
{
- /*
- * Make sure dma own bit will not be set before any other
- * descriptor fields.
- */
- wmb();
txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
}
@@ -677,6 +672,10 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
}
}
+ /* Order the previous packet and descriptor udpates
+ * before setting the OWN bit.
+ */
+ dma_wmb();
ftgmac100_txdes_set_dma_own(txdes);
/* Update next TX pointer */
--
2.9.3
next prev parent reply other threads:[~2017-04-10 1:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-10 1:15 [PATCH v2 00/12] ftgmac100: Rework batch 3 - TX path Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 01/12] ftgmac100: Add a tx timeout handler Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 02/12] ftgmac100: Move ftgmac100_hard_start_xmit() around Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 03/12] ftgmac100: Merge ftgmac100_xmit() into ftgmac100_hard_start_xmit() Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 04/12] ftgmac100: Factor tx packet dropping path Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 05/12] ftgmac100: Pad small frames properly Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 06/12] ftgmac100: Store tx skbs in a separate array Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 07/12] ftgmac100: Cleanup tx queue handling Benjamin Herrenschmidt
2017-04-10 1:15 ` Benjamin Herrenschmidt [this message]
2017-04-10 1:15 ` [PATCH v2 09/12] ftgmac100: Split tx packet freeing from ftgmac100_tx_complete_packet() Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 10/12] ftgmac100: Don't clear tx desc fields unnecessarily Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 11/12] ftgmac100: Add support for fragmented tx Benjamin Herrenschmidt
2017-04-10 1:15 ` [PATCH v2 12/12] ftgmac100: Remove tx descriptor accessors Benjamin Herrenschmidt
2017-04-10 20:04 ` [PATCH v2 00/12] ftgmac100: Rework batch 3 - TX path David Miller
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