net: hns3: add handling for big TX fragment

This patch unifies big tx fragment handling for tso and non-tso
case.

Signed-off-by: Fuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 31 insertions, 14 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 288d5277f377..3fb8e483a945 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -985,10 +985,13 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
         u32 ol_type_vlan_len_msec = 0;
         u16 bdtp_fe_sc_vld_ra_ri = 0;
         struct skb_frag_struct *frag;
+        unsigned int frag_buf_num;
         u32 type_cs_vlan_tso = 0;
         struct sk_buff *skb;
         u16 inner_vtag = 0;
         u16 out_vtag = 0;
+        unsigned int k;
+        int sizeoflast;
         u32 paylen = 0;
         dma_addr_t dma;
         u16 mss = 0;
@@ -996,16 +999,6 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
         u8 il4_proto;
         int ret;
 
-        /* The txbd's baseinfo of DESC_TYPE_PAGE & DESC_TYPE_SKB */
-        desc_cb->priv = priv;
-        desc_cb->length = size;
-        desc_cb->type = type;
-
-        /* now, fill the descriptor */
-        desc->tx.send_size = cpu_to_le16((u16)size);
-        hns3_set_txbd_baseinfo(&bdtp_fe_sc_vld_ra_ri, frag_end);
-        desc->tx.bdtp_fe_sc_vld_ra_ri = cpu_to_le16(bdtp_fe_sc_vld_ra_ri);
-
         if (type == DESC_TYPE_SKB) {
                 skb = (struct sk_buff *)priv;
                 paylen = skb->len;
@@ -1058,11 +1051,35 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                 return -ENOMEM;
         }
 
-        desc_cb->dma = dma;
-        desc->addr = cpu_to_le64(dma);
+        frag_buf_num = (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
+        sizeoflast = size % HNS3_MAX_BD_SIZE;
+        sizeoflast = sizeoflast ? sizeoflast : HNS3_MAX_BD_SIZE;
+
+        /* When frag size is bigger than hardware limit, split this frag */
+        for (k = 0; k < frag_buf_num; k++) {
+                /* The txbd's baseinfo of DESC_TYPE_PAGE & DESC_TYPE_SKB */
+                desc_cb->priv = priv;
+                desc_cb->length = (k == frag_buf_num - 1) ?
+                                        sizeoflast : HNS3_MAX_BD_SIZE;
+                desc_cb->dma = dma + HNS3_MAX_BD_SIZE * k;
+                desc_cb->type = (type == DESC_TYPE_SKB && !k) ?
+                                        DESC_TYPE_SKB : DESC_TYPE_PAGE;
+
+                /* now, fill the descriptor */
+                desc->addr = cpu_to_le64(dma + HNS3_MAX_BD_SIZE * k);
+                desc->tx.send_size = cpu_to_le16((u16)desc_cb->length);
+                hns3_set_txbd_baseinfo(&bdtp_fe_sc_vld_ra_ri,
+                                       frag_end && (k == frag_buf_num - 1) ?
+                                                1 : 0);
+                desc->tx.bdtp_fe_sc_vld_ra_ri =
+                                cpu_to_le16(bdtp_fe_sc_vld_ra_ri);
+
+                /* move ring pointer to next.*/
+                ring_ptr_move_fw(ring, next_to_use);
 
-        /* move ring pointer to next.*/
-        ring_ptr_move_fw(ring, next_to_use);
+                desc_cb = &ring->desc_cb[ring->next_to_use];
+                desc = &ring->desc[ring->next_to_use];
+        }
 
         return 0;
 }