From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: netdev@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Subject: [PATCH 1/2] sh_eth: fix RX buffer size alignment
Date: Fri, 23 Oct 2015 21:46:03 +0000 [thread overview]
Message-ID: <1685698.osUG5igxWz@wasted.cogentembedded.com> (raw)
In-Reply-To: <2249923.hKhT9K6gME@wasted.cogentembedded.com>
Both Renesas R-Car and RZ/A1 manuals state that RX buffer length must be
a multiple of 32 bytes, while the driver only uses 16 byte granularity...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
---
drivers/net/ethernet/renesas/sh_eth.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
Index: net/drivers/net/ethernet/renesas/sh_eth.c
=================================--- net.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net/drivers/net/ethernet/renesas/sh_eth.c
@@ -1148,8 +1148,8 @@ static void sh_eth_ring_format(struct ne
/* RX descriptor */
rxdesc = &mdp->rx_ring[i];
- /* The size of the buffer is a multiple of 16 bytes. */
- rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+ /* The size of the buffer is a multiple of 32 bytes. */
+ rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
dma_addr = dma_map_single(&ndev->dev, skb->data,
rxdesc->buffer_length,
DMA_FROM_DEVICE);
@@ -1506,7 +1506,7 @@ static int sh_eth_rx(struct net_device *
if (mdp->cd->rpadir)
skb_reserve(skb, NET_IP_ALIGN);
dma_unmap_single(&ndev->dev, rxdesc->addr,
- ALIGN(mdp->rx_buf_sz, 16),
+ ALIGN(mdp->rx_buf_sz, 32),
DMA_FROM_DEVICE);
skb_put(skb, pkt_len);
skb->protocol = eth_type_trans(skb, ndev);
@@ -1524,8 +1524,8 @@ static int sh_eth_rx(struct net_device *
for (; mdp->cur_rx - mdp->dirty_rx > 0; mdp->dirty_rx++) {
entry = mdp->dirty_rx % mdp->num_rx_ring;
rxdesc = &mdp->rx_ring[entry];
- /* The size of the buffer is 16 byte boundary. */
- rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+ /* The size of the buffer is 32 byte boundary. */
+ rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
if (mdp->rx_skbuff[entry] = NULL) {
skb = netdev_alloc_skb(ndev, skbuff_size);
WARNING: multiple messages have this Message-ID (diff)
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: netdev@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Subject: [PATCH 1/2] sh_eth: fix RX buffer size alignment
Date: Sat, 24 Oct 2015 00:46:03 +0300 [thread overview]
Message-ID: <1685698.osUG5igxWz@wasted.cogentembedded.com> (raw)
In-Reply-To: <2249923.hKhT9K6gME@wasted.cogentembedded.com>
Both Renesas R-Car and RZ/A1 manuals state that RX buffer length must be
a multiple of 32 bytes, while the driver only uses 16 byte granularity...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
---
drivers/net/ethernet/renesas/sh_eth.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
Index: net/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net/drivers/net/ethernet/renesas/sh_eth.c
@@ -1148,8 +1148,8 @@ static void sh_eth_ring_format(struct ne
/* RX descriptor */
rxdesc = &mdp->rx_ring[i];
- /* The size of the buffer is a multiple of 16 bytes. */
- rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+ /* The size of the buffer is a multiple of 32 bytes. */
+ rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
dma_addr = dma_map_single(&ndev->dev, skb->data,
rxdesc->buffer_length,
DMA_FROM_DEVICE);
@@ -1506,7 +1506,7 @@ static int sh_eth_rx(struct net_device *
if (mdp->cd->rpadir)
skb_reserve(skb, NET_IP_ALIGN);
dma_unmap_single(&ndev->dev, rxdesc->addr,
- ALIGN(mdp->rx_buf_sz, 16),
+ ALIGN(mdp->rx_buf_sz, 32),
DMA_FROM_DEVICE);
skb_put(skb, pkt_len);
skb->protocol = eth_type_trans(skb, ndev);
@@ -1524,8 +1524,8 @@ static int sh_eth_rx(struct net_device *
for (; mdp->cur_rx - mdp->dirty_rx > 0; mdp->dirty_rx++) {
entry = mdp->dirty_rx % mdp->num_rx_ring;
rxdesc = &mdp->rx_ring[entry];
- /* The size of the buffer is 16 byte boundary. */
- rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+ /* The size of the buffer is 32 byte boundary. */
+ rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
if (mdp->rx_skbuff[entry] == NULL) {
skb = netdev_alloc_skb(ndev, skbuff_size);
next prev parent reply other threads:[~2015-10-23 21:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-23 21:44 [PATCH 0/2] sh_eth: RX buffer alignment fixes Sergei Shtylyov
2015-10-23 21:44 ` Sergei Shtylyov
2015-10-23 21:46 ` Sergei Shtylyov [this message]
2015-10-23 21:46 ` [PATCH 1/2] sh_eth: fix RX buffer size alignment Sergei Shtylyov
2015-10-23 21:46 ` [PATCH 2/2] sh_eth: fix RX buffer size calculation Sergei Shtylyov
2015-10-23 21:46 ` Sergei Shtylyov
2015-10-27 1:32 ` [PATCH 0/2] sh_eth: RX buffer alignment fixes David Miller
2015-10-27 1:32 ` David Miller
2015-10-29 19:58 ` Sergei Shtylyov
2015-10-29 19:58 ` Sergei Shtylyov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1685698.osUG5igxWz@wasted.cogentembedded.com \
--to=sergei.shtylyov@cogentembedded.com \
--cc=linux-sh@vger.kernel.org \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.