diff mbox series

[net-next,v3,3/6] ravb: Create helper to allocate skb and align it

Message ID 20240304110858.117100-4-niklas.soderlund+renesas@ragnatech.se (mailing list archive)
State Accepted
Commit cfbad64706c1c9d555fba5dbb545967262bd9f17
Delegated to: Netdev Maintainers
Headers show
Series ravb: Align Rx descriptor setup and maintenance | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 940 this patch: 940
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/build_clang success Errors and warnings before: 956 this patch: 956
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 956 this patch: 956
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 146 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-03-05--21-00 (tests: 892)

Commit Message

Niklas Söderlund March 4, 2024, 11:08 a.m. UTC 
The EtherAVB device requires the SKB data to be aligned to 128 bytes.
The alignment is done by allocating an skb 128 bytes larger than the
maximum frame size supported by the device and adjusting the headroom to
fit the requirement.

This code has been refactored a few times and small issues have been
added along the way. The issues are not harmful but prevent merging
parts of the Rx code which have been split in two implementations with
the addition of RZ/G2L support, a device that supports larger frame
sizes.

This change removes the need for duplicated and somewhat inaccurate
hardware alignment constrains stored in the hardware information struct
by creating a helper to handle the allocation of an skb and alignment of
an skb data.

For the R-Car class of devices the maximum frame size is 4K and each
descriptor is limited to 2K of data. The current implementation does not
support split descriptors, this limits the frame size to 2K. The
current hardware information however records the descriptor size just
under 2K due to bad understanding of the device when larger MTUs where
added.

For the RZ/G2L device the maximum frame size is 8K and each descriptor
is limited to 4K of data. The current hardware information records this
correctly, but it gets the alignment constrains wrong as just aligns it
by 128, it does not extend it by 128 bytes to allow the full frame to be
stored. This works because the RZ/G2L device supports split descriptors
and allocates each skb to 8K and aligns each 4K descriptor in this
space.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
---
* Changes since v1
- Add a GFP mask argument to ravb_alloc_skb() to preserve GFP_KERNEL at
  init time.

* Changes since v2
- Fix spelling in commit message.
---
 drivers/net/ethernet/renesas/ravb.h      |  1 -
 drivers/net/ethernet/renesas/ravb_main.c | 43 +++++++++++++-----------
 2 files changed, 24 insertions(+), 20 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 7f9e8b2c012a..751bb29cd488 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -1057,7 +1057,6 @@  struct ravb_hw_info {
 	netdev_features_t net_hw_features;
 	netdev_features_t net_features;
 	int stats_len;
-	size_t max_rx_len;
 	u32 tccr_mask;
 	u32 rx_max_frame_size;
 	unsigned aligned_tx: 1;
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 5c72b780d623..e6b025058847 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -113,12 +113,23 @@  static void ravb_set_rate_rcar(struct net_device *ndev)
 	}
 }
 
-static void ravb_set_buffer_align(struct sk_buff *skb)
+static struct sk_buff *
+ravb_alloc_skb(struct net_device *ndev, const struct ravb_hw_info *info,
+	       gfp_t gfp_mask)
 {
-	u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
+	struct sk_buff *skb;
+	u32 reserve;
 
+	skb = __netdev_alloc_skb(ndev, info->rx_max_frame_size + RAVB_ALIGN - 1,
+				 gfp_mask);
+	if (!skb)
+		return NULL;
+
+	reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1);
 	if (reserve)
 		skb_reserve(skb, RAVB_ALIGN - reserve);
+
+	return skb;
 }
 
 /* Get MAC address from the MAC address registers
@@ -251,7 +262,7 @@  static void ravb_rx_ring_free_gbeth(struct net_device *ndev, int q)
 				       le32_to_cpu(desc->dptr)))
 			dma_unmap_single(ndev->dev.parent,
 					 le32_to_cpu(desc->dptr),
-					 GBETH_RX_BUFF_MAX,
+					 priv->info->rx_max_frame_size,
 					 DMA_FROM_DEVICE);
 	}
 	ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1);
@@ -276,7 +287,7 @@  static void ravb_rx_ring_free_rcar(struct net_device *ndev, int q)
 				       le32_to_cpu(desc->dptr)))
 			dma_unmap_single(ndev->dev.parent,
 					 le32_to_cpu(desc->dptr),
-					 RX_BUF_SZ,
+					 priv->info->rx_max_frame_size,
 					 DMA_FROM_DEVICE);
 	}
 	ring_size = sizeof(struct ravb_ex_rx_desc) *
@@ -342,7 +353,7 @@  static void ravb_rx_ring_format_gbeth(struct net_device *ndev, int q)
 		rx_desc = &priv->rx_ring[q].desc[i];
 		rx_desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE);
 		dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
-					  GBETH_RX_BUFF_MAX,
+					  priv->info->rx_max_frame_size,
 					  DMA_FROM_DEVICE);
 		/* We just set the data size to 0 for a failed mapping which
 		 * should prevent DMA from happening...
@@ -372,7 +383,7 @@  static void ravb_rx_ring_format_rcar(struct net_device *ndev, int q)
 		rx_desc = &priv->rx_ring[q].ex_desc[i];
 		rx_desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
 		dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data,
-					  RX_BUF_SZ,
+					  priv->info->rx_max_frame_size,
 					  DMA_FROM_DEVICE);
 		/* We just set the data size to 0 for a failed mapping which
 		 * should prevent DMA from happening...
@@ -476,10 +487,9 @@  static int ravb_ring_init(struct net_device *ndev, int q)
 		goto error;
 
 	for (i = 0; i < priv->num_rx_ring[q]; i++) {
-		skb = __netdev_alloc_skb(ndev, info->max_rx_len, GFP_KERNEL);
+		skb = ravb_alloc_skb(ndev, info, GFP_KERNEL);
 		if (!skb)
 			goto error;
-		ravb_set_buffer_align(skb);
 		priv->rx_skb[q][i] = skb;
 	}
 
@@ -805,7 +815,8 @@  static struct sk_buff *ravb_get_skb_gbeth(struct net_device *ndev, int entry,
 	skb = priv->rx_skb[RAVB_BE][entry];
 	priv->rx_skb[RAVB_BE][entry] = NULL;
 	dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
-			 ALIGN(GBETH_RX_BUFF_MAX, 16), DMA_FROM_DEVICE);
+			 ALIGN(priv->info->rx_max_frame_size, 16),
+			 DMA_FROM_DEVICE);
 
 	return skb;
 }
@@ -912,13 +923,12 @@  static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q)
 		desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE);
 
 		if (!priv->rx_skb[q][entry]) {
-			skb = netdev_alloc_skb(ndev, info->max_rx_len);
+			skb = ravb_alloc_skb(ndev, info, GFP_ATOMIC);
 			if (!skb)
 				break;
-			ravb_set_buffer_align(skb);
 			dma_addr = dma_map_single(ndev->dev.parent,
 						  skb->data,
-						  GBETH_RX_BUFF_MAX,
+						  priv->info->rx_max_frame_size,
 						  DMA_FROM_DEVICE);
 			skb_checksum_none_assert(skb);
 			/* We just set the data size to 0 for a failed mapping
@@ -992,7 +1002,7 @@  static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q)
 			skb = priv->rx_skb[q][entry];
 			priv->rx_skb[q][entry] = NULL;
 			dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr),
-					 RX_BUF_SZ,
+					 priv->info->rx_max_frame_size,
 					 DMA_FROM_DEVICE);
 			get_ts &= (q == RAVB_NC) ?
 					RAVB_RXTSTAMP_TYPE_V2_L2_EVENT :
@@ -1028,10 +1038,9 @@  static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q)
 		desc->ds_cc = cpu_to_le16(RX_BUF_SZ);
 
 		if (!priv->rx_skb[q][entry]) {
-			skb = netdev_alloc_skb(ndev, info->max_rx_len);
+			skb = ravb_alloc_skb(ndev, info, GFP_ATOMIC);
 			if (!skb)
 				break;	/* Better luck next round. */
-			ravb_set_buffer_align(skb);
 			dma_addr = dma_map_single(ndev->dev.parent, skb->data,
 						  le16_to_cpu(desc->ds_cc),
 						  DMA_FROM_DEVICE);
@@ -2682,7 +2691,6 @@  static const struct ravb_hw_info ravb_gen3_hw_info = {
 	.net_hw_features = NETIF_F_RXCSUM,
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
-	.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
 	.rx_max_frame_size = SZ_2K,
 	.internal_delay = 1,
@@ -2708,7 +2716,6 @@  static const struct ravb_hw_info ravb_gen2_hw_info = {
 	.net_hw_features = NETIF_F_RXCSUM,
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
-	.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
 	.rx_max_frame_size = SZ_2K,
 	.aligned_tx = 1,
@@ -2731,7 +2738,6 @@  static const struct ravb_hw_info ravb_rzv2m_hw_info = {
 	.net_hw_features = NETIF_F_RXCSUM,
 	.net_features = NETIF_F_RXCSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats),
-	.max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1,
 	.tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3,
 	.rx_max_frame_size = SZ_2K,
 	.multi_irqs = 1,
@@ -2756,7 +2762,6 @@  static const struct ravb_hw_info gbeth_hw_info = {
 	.net_hw_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
 	.net_features = NETIF_F_RXCSUM | NETIF_F_HW_CSUM,
 	.stats_len = ARRAY_SIZE(ravb_gstrings_stats_gbeth),
-	.max_rx_len = ALIGN(GBETH_RX_BUFF_MAX, RAVB_ALIGN),
 	.tccr_mask = TCCR_TSRQ0,
 	.rx_max_frame_size = SZ_8K,
 	.aligned_tx = 1,