[PATCH net-next v3 04/12] bnxt_en: Parameterize RX buffer offsets.

[Michael Chan]

Convert the global constants BNXT_RX_OFFSET and BNXT_RX_DMA_OFFSET to
device parameters.  This will make it easier to support XDP with
headroom support which requires different RX buffer offsets.

Signed-off-by: Michael Chan <michael.c...@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 15 +++++++++------
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |  2 ++
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c 
b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index ee2cada..c0f2167 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -583,7 +583,7 @@ static inline u8 *__bnxt_alloc_rx_data(struct bnxt *bp, 
dma_addr_t *mapping,
        if (!data)
                return NULL;
 
-       *mapping = dma_map_single(&pdev->dev, data + BNXT_RX_DMA_OFFSET,
+       *mapping = dma_map_single(&pdev->dev, data + bp->rx_dma_offset,
                                  bp->rx_buf_use_size, bp->rx_dir);
 
        if (dma_mapping_error(&pdev->dev, *mapping)) {
@@ -607,7 +607,7 @@ static inline int bnxt_alloc_rx_data(struct bnxt *bp,
                return -ENOMEM;
 
        rx_buf->data = data;
-       rx_buf->data_ptr = data + BNXT_RX_OFFSET;
+       rx_buf->data_ptr = data + bp->rx_offset;
        rx_buf->mapping = mapping;
 
        rxbd->rx_bd_haddr = cpu_to_le64(mapping);
@@ -778,7 +778,7 @@ static struct sk_buff *bnxt_rx_skb(struct bnxt *bp,
                return NULL;
        }
 
-       skb_reserve(skb, BNXT_RX_OFFSET);
+       skb_reserve(skb, bp->rx_offset);
        skb_put(skb, offset_and_len & 0xffff);
        return skb;
 }
@@ -1255,7 +1255,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt 
*bp,
                }
 
                tpa_info->data = new_data;
-               tpa_info->data_ptr = new_data + BNXT_RX_OFFSET;
+               tpa_info->data_ptr = new_data + bp->rx_offset;
                tpa_info->mapping = new_mapping;
 
                skb = build_skb(data, 0);
@@ -1267,7 +1267,7 @@ static inline struct sk_buff *bnxt_tpa_end(struct bnxt 
*bp,
                        bnxt_abort_tpa(bp, bnapi, cp_cons, agg_bufs);
                        return NULL;
                }
-               skb_reserve(skb, BNXT_RX_OFFSET);
+               skb_reserve(skb, bp->rx_offset);
                skb_put(skb, len);
        }
 
@@ -2332,7 +2332,7 @@ static int bnxt_init_one_rx_ring(struct bnxt *bp, int 
ring_nr)
                                        return -ENOMEM;
 
                                rxr->rx_tpa[i].data = data;
-                               rxr->rx_tpa[i].data_ptr = data + BNXT_RX_OFFSET;
+                               rxr->rx_tpa[i].data_ptr = data + bp->rx_offset;
                                rxr->rx_tpa[i].mapping = mapping;
                        }
                } else {
@@ -2348,6 +2348,9 @@ static int bnxt_init_rx_rings(struct bnxt *bp)
 {
        int i, rc = 0;
 
+       bp->rx_offset = BNXT_RX_OFFSET;
+       bp->rx_dma_offset = BNXT_RX_DMA_OFFSET;
+
        for (i = 0; i < bp->rx_nr_rings; i++) {
                rc = bnxt_init_one_rx_ring(bp, i);
                if (rc)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h 
b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 353b6d1..d8fc871 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -997,6 +997,8 @@ struct bnxt {
 
        u32                     rx_buf_size;
        u32                     rx_buf_use_size;        /* useable size */
+       u16                     rx_offset;
+       u16                     rx_dma_offset;
        enum dma_data_direction rx_dir;
        u32                     rx_ring_size;
        u32                     rx_agg_ring_size;
-- 
1.8.3.1