Thread (7 messages) 7 messages, 2 authors, 2023-10-23

RE: [PATCH net-next 1/3] octeon_ep: remove dma sync in trasmit path

From: Drewek, Wojciech <hidden>
Date: 2023-10-23 12:02:41
Also in: lkml

-----Original Message-----
From: Shinas Rasheed <srasheed@marvell.com>
Sent: Monday, October 23, 2023 1:45 PM
To: netdev@vger.kernel.org; linux-kernel@vger.kernel.org
Cc: hgani@marvell.com; vimleshk@marvell.com; Gallen, Erwan <redacted>; mschmidt <redacted>;
pabeni@redhat.com; horms@kernel.org; kuba@kernel.org; davem@davemloft.net; Shinas Rasheed [off-list ref];
Veerasenareddy Burru [off-list ref]; Sathesh Edara [off-list ref]; Eric Dumazet [off-list ref]
Subject: [PATCH net-next 1/3] octeon_ep: remove dma sync in trasmit path

Cleanup dma sync calls for scatter gather
mappings in trasmit path

Signed-off-by: Shinas Rasheed <srasheed@marvell.com>
Hi Shinas,

The commit msg only says what changed without justification.
What is the reasoning behind those changes?
quoted hunk ↗ jump to hunk
---
 drivers/net/ethernet/marvell/octeon_ep/octep_main.c | 7 -------
 1 file changed, 7 deletions(-)
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index 552970c7dec0..bf1e376a4232 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -869,9 +869,6 @@ static netdev_tx_t octep_start_xmit(struct sk_buff *skb,
 		if (dma_mapping_error(iq->dev, dma))
 			goto dma_map_err;

-		dma_sync_single_for_cpu(iq->dev, tx_buffer->sglist_dma,
-					OCTEP_SGLIST_SIZE_PER_PKT,
-					DMA_TO_DEVICE);
 		memset(sglist, 0, OCTEP_SGLIST_SIZE_PER_PKT);
 		sglist[0].len[3] = len;
 		sglist[0].dma_ptr[0] = dma;
@@ -891,10 +888,6 @@ static netdev_tx_t octep_start_xmit(struct sk_buff *skb,
 			frag++;
 			si++;
 		}
-		dma_sync_single_for_device(iq->dev, tx_buffer->sglist_dma,
-					   OCTEP_SGLIST_SIZE_PER_PKT,
-					   DMA_TO_DEVICE);
-
 		hw_desc->dptr = tx_buffer->sglist_dma;
 	}

--
2.25.1
  
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