staging: fsl-dpaa2/eth: Fix access to FAS field

Commit 4b2d9fe87950 ("staging: fsl-dpaa2/eth: Extra headroom in RX
buffers") removes the software annotation (SWA) area from the RX
buffer layout, as it's not used by anyone, but fails to update the
macros for accessing hardware annotation (HWA) fields, which is
right after the SWA in the buffer headroom.

This may lead to some frame annotation status fields (e.g. indication
if L3/L4 checksum is valid) to be read incorrectly.

Turn the accessor macros into inline functions and add a bool param
to specify if SWA is present or not.

Fixes: 4b2d9fe87950 ("staging: fsl-dpaa2/eth: Extra headroom in RX buffers")
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
index 0d8ed002adcbab4b764ef949d4eaec1f621c5e07..c8a8e3abfc3ac4cf9080906f3d0e2a467fefc150 100644 (file)
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c
@@ -249,7 +249,7 @@ static void dpaa2_eth_rx(struct dpaa2_eth_priv *priv,
        vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr);
        dma_unmap_single(dev, addr, DPAA2_ETH_RX_BUF_SIZE, DMA_FROM_DEVICE);
 
-       fas = dpaa2_get_fas(vaddr);
+       fas = dpaa2_get_fas(vaddr, false);
        prefetch(fas);
        buf_data = vaddr + dpaa2_fd_get_offset(fd);
        prefetch(buf_data);
@@ -385,7 +385,7 @@ static int build_sg_fd(struct dpaa2_eth_priv *priv,
         * on TX confirmation. We are clearing FAS (Frame Annotation Status)
         * field from the hardware annotation area
         */
-       fas = dpaa2_get_fas(sgt_buf);
+       fas = dpaa2_get_fas(sgt_buf, true);
        memset(fas, 0, DPAA2_FAS_SIZE);
 
        sgt = (struct dpaa2_sg_entry *)(sgt_buf + priv->tx_data_offset);
@@ -458,7 +458,7 @@ static int build_single_fd(struct dpaa2_eth_priv *priv,
         * on TX confirmation. We are clearing FAS (Frame Annotation Status)
         * field from the hardware annotation area
         */
-       fas = dpaa2_get_fas(buffer_start);
+       fas = dpaa2_get_fas(buffer_start, true);
        memset(fas, 0, DPAA2_FAS_SIZE);
 
        /* Store a backpointer to the skb at the beginning of the buffer
@@ -510,7 +510,7 @@ static void free_tx_fd(const struct dpaa2_eth_priv *priv,
 
        fd_addr = dpaa2_fd_get_addr(fd);
        skbh = dpaa2_iova_to_virt(priv->iommu_domain, fd_addr);
-       fas = dpaa2_get_fas(skbh);
+       fas = dpaa2_get_fas(skbh, true);
 
        if (fd_format == dpaa2_fd_single) {
                skb = *skbh;

diff --git a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
index 5b3ab9f62d5eea8ecf964b2e9059035b395f5d38..3a4e9395acdced3c8511e546fb17884e766576df 100644 (file)
--- a/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
+++ b/drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h
@@ -153,10 +153,15 @@ struct dpaa2_fas {
 #define DPAA2_FAS_SIZE                 (sizeof(struct dpaa2_fas))
 
 /* Accessors for the hardware annotation fields that we use */
-#define dpaa2_get_hwa(buf_addr) \
-       ((void *)(buf_addr) + DPAA2_ETH_SWA_SIZE)
-#define dpaa2_get_fas(buf_addr) \
-       (struct dpaa2_fas *)(dpaa2_get_hwa(buf_addr) + DPAA2_FAS_OFFSET)
+static inline void *dpaa2_get_hwa(void *buf_addr, bool swa)
+{
+       return buf_addr + (swa ? DPAA2_ETH_SWA_SIZE : 0);
+}
+
+static inline struct dpaa2_fas *dpaa2_get_fas(void *buf_addr, bool swa)
+{
+       return dpaa2_get_hwa(buf_addr, swa) + DPAA2_FAS_OFFSET;
+}
 
 /* Error and status bits in the frame annotation status word */
 /* Debug frame, otherwise supposed to be discarded */