[PATCH net v3 1/2] dpaa_eth: update the buffer layout for non-A050385 erratum scenarios

[Camelia Groza]

Impose a larger RX private data area only when the A050385 erratum is
present on the hardware. A smaller buffer size is sufficient in all
other scenarios. This enables a wider range of linear Jumbo frame
sizes in non-erratum scenarios, instead of turning to multi
buffer Scatter/Gather frames. The maximum linear frame size is
increased by 128 bytes for non-erratum arm64 platforms.

Cleanup the hardware annotations header defines in the process.

Fixes: 3c68b8fffb48 ("dpaa_eth: FMan erratum A050385 workaround")
Signed-off-by: Camelia Groza <camelia.gr...@nxp.com>
---
Changes in v3:
- refactor defines for clarity
- add more details on the user impact

 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c 
b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 06cc863..3eaa5f2 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -174,12 +174,17 @@
 #define DPAA_PARSE_RESULTS_SIZE sizeof(struct fman_prs_result)
 #define DPAA_TIME_STAMP_SIZE 8
 #define DPAA_HASH_RESULTS_SIZE 8
+#define DPAA_HWA_SIZE (DPAA_PARSE_RESULTS_SIZE + DPAA_TIME_STAMP_SIZE \
+                      + DPAA_HASH_RESULTS_SIZE)
+#define DPAA_RX_PRIV_DATA_DEFAULT_SIZE (DPAA_TX_PRIV_DATA_SIZE + \
+                                       dpaa_rx_extra_headroom)
 #ifdef CONFIG_DPAA_ERRATUM_A050385
-#define DPAA_RX_PRIV_DATA_SIZE (DPAA_A050385_ALIGN - (DPAA_PARSE_RESULTS_SIZE\
-        + DPAA_TIME_STAMP_SIZE + DPAA_HASH_RESULTS_SIZE))
+#define DPAA_RX_PRIV_DATA_A050385_SIZE (DPAA_A050385_ALIGN - DPAA_HWA_SIZE)
+#define DPAA_RX_PRIV_DATA_SIZE (fman_has_errata_a050385() ? \
+                               DPAA_RX_PRIV_DATA_A050385_SIZE : \
+                               DPAA_RX_PRIV_DATA_DEFAULT_SIZE)
 #else
-#define DPAA_RX_PRIV_DATA_SIZE (u16)(DPAA_TX_PRIV_DATA_SIZE + \
-                                       dpaa_rx_extra_headroom)
+#define DPAA_RX_PRIV_DATA_SIZE DPAA_RX_PRIV_DATA_DEFAULT_SIZE
 #endif

 #define DPAA_ETH_PCD_RXQ_NUM   128
@@ -2854,8 +2859,7 @@ static inline u16 dpaa_get_headroom(struct 
dpaa_buffer_layout *bl)
         *
         * Also make sure the headroom is a multiple of data_align bytes
         */
-       headroom = (u16)(bl->priv_data_size + DPAA_PARSE_RESULTS_SIZE +
-               DPAA_TIME_STAMP_SIZE + DPAA_HASH_RESULTS_SIZE);
+       headroom = (u16)(bl->priv_data_size + DPAA_HWA_SIZE);

        return ALIGN(headroom, DPAA_FD_DATA_ALIGNMENT);
 }
--
1.9.1