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Date: Fri, 1 Mar 2019 17:47:23 +0000
From: Ioana Ciornei <ioana.ciornei@....com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>
CC: Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
"brouer@...hat.com" <brouer@...hat.com>,
"ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
"toke@...hat.com" <toke@...hat.com>,
Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH v2 1/2] dpaa2-eth: Add software annotation types
From: Ioana Radulescu <ruxandra.radulescu@....com>
We write different metadata information in the software annotation
area of Tx frames, depending on frame type. Make this more explicit
by introducing a type field and separate structures for single buffer
and scatter-gather frames.
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@....com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
Changes in v2:
- none
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 38 +++++++++++++-----------
drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h | 24 ++++++++++++---
2 files changed, 40 insertions(+), 22 deletions(-)
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 87777b0..3acfd8c 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -571,10 +571,11 @@ static int build_sg_fd(struct dpaa2_eth_priv *priv,
* all of them on Tx Conf.
*/
swa = (struct dpaa2_eth_swa *)sgt_buf;
- swa->skb = skb;
- swa->scl = scl;
- swa->num_sg = num_sg;
- swa->sgt_size = sgt_buf_size;
+ swa->type = DPAA2_ETH_SWA_SG;
+ swa->sg.skb = skb;
+ swa->sg.scl = scl;
+ swa->sg.num_sg = num_sg;
+ swa->sg.sgt_size = sgt_buf_size;
/* Separately map the SGT buffer */
addr = dma_map_single(dev, sgt_buf, sgt_buf_size, DMA_BIDIRECTIONAL);
@@ -609,7 +610,7 @@ static int build_single_fd(struct dpaa2_eth_priv *priv,
{
struct device *dev = priv->net_dev->dev.parent;
u8 *buffer_start, *aligned_start;
- struct sk_buff **skbh;
+ struct dpaa2_eth_swa *swa;
dma_addr_t addr;
buffer_start = skb->data - dpaa2_eth_needed_headroom(priv, skb);
@@ -626,8 +627,9 @@ static int build_single_fd(struct dpaa2_eth_priv *priv,
* (in the private data area) such that we can release it
* on Tx confirm
*/
- skbh = (struct sk_buff **)buffer_start;
- *skbh = skb;
+ swa = (struct dpaa2_eth_swa *)buffer_start;
+ swa->type = DPAA2_ETH_SWA_SINGLE;
+ swa->single.skb = skb;
addr = dma_map_single(dev, buffer_start,
skb_tail_pointer(skb) - buffer_start,
@@ -659,17 +661,17 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
{
struct device *dev = priv->net_dev->dev.parent;
dma_addr_t fd_addr;
- struct sk_buff **skbh, *skb;
+ struct sk_buff *skb;
unsigned char *buffer_start;
struct dpaa2_eth_swa *swa;
u8 fd_format = dpaa2_fd_get_format(fd);
fd_addr = dpaa2_fd_get_addr(fd);
- skbh = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
+ buffer_start = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
+ swa = (struct dpaa2_eth_swa *)buffer_start;
if (fd_format == dpaa2_fd_single) {
- skb = *skbh;
- buffer_start = (unsigned char *)skbh;
+ skb = swa->single.skb;
/* Accessing the skb buffer is safe before dma unmap, because
* we didn't map the actual skb shell.
*/
@@ -677,15 +679,15 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
skb_tail_pointer(skb) - buffer_start,
DMA_BIDIRECTIONAL);
} else if (fd_format == dpaa2_fd_sg) {
- swa = (struct dpaa2_eth_swa *)skbh;
- skb = swa->skb;
+ skb = swa->sg.skb;
/* Unmap the scatterlist */
- dma_unmap_sg(dev, swa->scl, swa->num_sg, DMA_BIDIRECTIONAL);
- kfree(swa->scl);
+ dma_unmap_sg(dev, swa->sg.scl, swa->sg.num_sg,
+ DMA_BIDIRECTIONAL);
+ kfree(swa->sg.scl);
/* Unmap the SGT buffer */
- dma_unmap_single(dev, fd_addr, swa->sgt_size,
+ dma_unmap_single(dev, fd_addr, swa->sg.sgt_size,
DMA_BIDIRECTIONAL);
} else {
netdev_dbg(priv->net_dev, "Invalid FD format\n");
@@ -695,7 +697,7 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
/* Get the timestamp value */
if (priv->tx_tstamp && skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
struct skb_shared_hwtstamps shhwtstamps;
- __le64 *ts = dpaa2_get_ts(skbh, true);
+ __le64 *ts = dpaa2_get_ts(buffer_start, true);
u64 ns;
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
@@ -707,7 +709,7 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
/* Free SGT buffer allocated on tx */
if (fd_format != dpaa2_fd_single)
- skb_free_frag(skbh);
+ skb_free_frag(buffer_start);
/* Move on with skb release */
napi_consume_skb(skb, in_napi);
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
index 9510928..423976d 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.h
@@ -89,12 +89,28 @@
*/
#define DPAA2_ETH_SWA_SIZE 64
+/* We store different information in the software annotation area of a Tx frame
+ * based on what type of frame it is
+ */
+enum dpaa2_eth_swa_type {
+ DPAA2_ETH_SWA_SINGLE,
+ DPAA2_ETH_SWA_SG,
+};
+
/* Must keep this struct smaller than DPAA2_ETH_SWA_SIZE */
struct dpaa2_eth_swa {
- struct sk_buff *skb;
- struct scatterlist *scl;
- int num_sg;
- int sgt_size;
+ enum dpaa2_eth_swa_type type;
+ union {
+ struct {
+ struct sk_buff *skb;
+ } single;
+ struct {
+ struct sk_buff *skb;
+ struct scatterlist *scl;
+ int num_sg;
+ int sgt_size;
+ } sg;
+ };
};
/* Annotation valid bits in FD FRC */
--
1.9.1
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