net: hns3: fix the max tx size according to user manual

Currently the max tx size supported by the hw is calculated by
using the max BD num supported by the hw. According to the hw
user manual, the max tx size is fixed value for both non-TSO and
TSO skb.

This patch updates the max tx size according to the manual.

Fixes: 8ae10cfb("net: hns3: support tx-scatter-gather-fraglist feature")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -1847,7 +1847,6 @@ void hns3_shinfo_pack(struct skb_shared_info *shinfo, __u32 *size)
 
 static int hns3_skb_linearize(struct hns3_enet_ring *ring,
 			      struct sk_buff *skb,
-			      u8 max_non_tso_bd_num,
 			      unsigned int bd_num)
 {
 	/* 'bd_num == UINT_MAX' means the skb' fraglist has a
@@ -1864,8 +1863,7 @@ static int hns3_skb_linearize(struct hns3_enet_ring *ring,
 	 * will not help.
 	 */
 	if (skb->len > HNS3_MAX_TSO_SIZE ||
-	    (!skb_is_gso(skb) && skb->len >
-	     HNS3_MAX_NON_TSO_SIZE(max_non_tso_bd_num))) {
+	    (!skb_is_gso(skb) && skb->len > HNS3_MAX_NON_TSO_SIZE)) {
 		u64_stats_update_begin(&ring->syncp);
 		ring->stats.hw_limitation++;
 		u64_stats_update_end(&ring->syncp);
@@ -1900,8 +1898,7 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
 			goto out;
 		}
 
-		if (hns3_skb_linearize(ring, skb, max_non_tso_bd_num,
-				       bd_num))
+		if (hns3_skb_linearize(ring, skb, bd_num))
 			return -ENOMEM;
 
 		bd_num = hns3_tx_bd_count(skb->len);

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

@@ -186,11 +186,9 @@ enum hns3_nic_state {
 
 #define HNS3_MAX_BD_SIZE			65535
 #define HNS3_MAX_TSO_BD_NUM			63U
-#define HNS3_MAX_TSO_SIZE \
-	(HNS3_MAX_BD_SIZE * HNS3_MAX_TSO_BD_NUM)
+#define HNS3_MAX_TSO_SIZE			1048576U
+#define HNS3_MAX_NON_TSO_SIZE			9728U
 
-#define HNS3_MAX_NON_TSO_SIZE(max_non_tso_bd_num) \
-	(HNS3_MAX_BD_SIZE * (max_non_tso_bd_num))
 
 #define HNS3_VECTOR_GL0_OFFSET			0x100
 #define HNS3_VECTOR_GL1_OFFSET			0x200