net: hns3: replace macro HNS3_MAX_NON_TSO_BD_NUM

Currently, the driver is able to query the device's specifications,
which includes the maximum BD number of non TSO packet, so replace
macro HNS3_MAX_NON_TSO_BD_NUM with the queried value, and rewrite
macro HNS3_MAX_NON_TSO_SIZE whose value depends on the the maximum
BD number of non TSO packet.

Also, add a new parameter max_non_tso_bd_num to function
hns3_tx_bd_num() and hns3_skb_need_linearized(), then they can get
the maximum BD number of non TSO packet from the caller instead of
calculating by themself, The note of hns3_skb_need_linearized()
should be update as well.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 1c4e820..a393755 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1184,21 +1184,23 @@ static unsigned int hns3_skb_bd_num(struct sk_buff *skb, unsigned int *bd_size,
        return bd_num;
 }
 
-static unsigned int hns3_tx_bd_num(struct sk_buff *skb, unsigned int *bd_size)
+static unsigned int hns3_tx_bd_num(struct sk_buff *skb, unsigned int *bd_size,
+                                  u8 max_non_tso_bd_num)
 {
        struct sk_buff *frag_skb;
        unsigned int bd_num = 0;
 
        /* If the total len is within the max bd limit */
        if (likely(skb->len <= HNS3_MAX_BD_SIZE && !skb_has_frag_list(skb) &&
-                  skb_shinfo(skb)->nr_frags < HNS3_MAX_NON_TSO_BD_NUM))
+                  skb_shinfo(skb)->nr_frags < max_non_tso_bd_num))
                return skb_shinfo(skb)->nr_frags + 1U;
 
        /* The below case will always be linearized, return
         * HNS3_MAX_BD_NUM_TSO + 1U to make sure it is linearized.
         */
        if (unlikely(skb->len > HNS3_MAX_TSO_SIZE ||
-                    (!skb_is_gso(skb) && skb->len > HNS3_MAX_NON_TSO_SIZE)))
+                    (!skb_is_gso(skb) && skb->len >
+                     HNS3_MAX_NON_TSO_SIZE(max_non_tso_bd_num))))
                return HNS3_MAX_TSO_BD_NUM + 1U;
 
        bd_num = hns3_skb_bd_num(skb, bd_size, bd_num);
@@ -1223,31 +1225,34 @@ static unsigned int hns3_gso_hdr_len(struct sk_buff *skb)
        return skb_inner_transport_offset(skb) + inner_tcp_hdrlen(skb);
 }
 
-/* HW need every continuous 8 buffer data to be larger than MSS,
- * we simplify it by ensuring skb_headlen + the first continuous
- * 7 frags to to be larger than gso header len + mss, and the remaining
- * continuous 7 frags to be larger than MSS except the last 7 frags.
+/* HW need every continuous max_non_tso_bd_num buffer data to be larger
+ * than MSS, we simplify it by ensuring skb_headlen + the first continuous
+ * max_non_tso_bd_num - 1 frags to be larger than gso header len + mss,
+ * and the remaining continuous max_non_tso_bd_num - 1 frags to be larger
+ * than MSS except the last max_non_tso_bd_num - 1 frags.
  */
 static bool hns3_skb_need_linearized(struct sk_buff *skb, unsigned int *bd_size,
-                                    unsigned int bd_num)
+                                    unsigned int bd_num, u8 max_non_tso_bd_num)
 {
        unsigned int tot_len = 0;
        int i;
 
-       for (i = 0; i < HNS3_MAX_NON_TSO_BD_NUM - 1U; i++)
+       for (i = 0; i < max_non_tso_bd_num - 1U; i++)
                tot_len += bd_size[i];
 
-       /* ensure the first 8 frags is greater than mss + header */
-       if (tot_len + bd_size[HNS3_MAX_NON_TSO_BD_NUM - 1U] <
+       /* ensure the first max_non_tso_bd_num frags is greater than
+        * mss + header
+        */
+       if (tot_len + bd_size[max_non_tso_bd_num - 1U] <
            skb_shinfo(skb)->gso_size + hns3_gso_hdr_len(skb))
                return true;
 
-       /* ensure every continuous 7 buffer is greater than mss
-        * except the last one.
+       /* ensure every continuous max_non_tso_bd_num - 1 buffer is greater
+        * than mss except the last one.
         */
-       for (i = 0; i < bd_num - HNS3_MAX_NON_TSO_BD_NUM; i++) {
+       for (i = 0; i < bd_num - max_non_tso_bd_num; i++) {
                tot_len -= bd_size[i];
-               tot_len += bd_size[i + HNS3_MAX_NON_TSO_BD_NUM - 1U];
+               tot_len += bd_size[i + max_non_tso_bd_num - 1U];
 
                if (tot_len < skb_shinfo(skb)->gso_size)
                        return true;
@@ -1269,13 +1274,15 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
                                  struct sk_buff *skb)
 {
        struct hns3_nic_priv *priv = netdev_priv(netdev);
+       u8 max_non_tso_bd_num = priv->max_non_tso_bd_num;
        unsigned int bd_size[HNS3_MAX_TSO_BD_NUM + 1U];
        unsigned int bd_num;
 
-       bd_num = hns3_tx_bd_num(skb, bd_size);
-       if (unlikely(bd_num > HNS3_MAX_NON_TSO_BD_NUM)) {
+       bd_num = hns3_tx_bd_num(skb, bd_size, max_non_tso_bd_num);
+       if (unlikely(bd_num > max_non_tso_bd_num)) {
                if (bd_num <= HNS3_MAX_TSO_BD_NUM && skb_is_gso(skb) &&
-                   !hns3_skb_need_linearized(skb, bd_size, bd_num)) {
+                   !hns3_skb_need_linearized(skb, bd_size, bd_num,
+                                             max_non_tso_bd_num)) {
                        trace_hns3_over_8bd(skb);
                        goto out;
                }
@@ -1286,7 +1293,7 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
                bd_num = hns3_tx_bd_count(skb->len);
                if ((skb_is_gso(skb) && bd_num > HNS3_MAX_TSO_BD_NUM) ||
                    (!skb_is_gso(skb) &&
-                    bd_num > HNS3_MAX_NON_TSO_BD_NUM)) {
+                    bd_num > max_non_tso_bd_num)) {
                        trace_hns3_over_8bd(skb);
                        return -ENOMEM;
                }
@@ -3991,6 +3998,7 @@ static void hns3_info_show(struct hns3_nic_priv *priv)
 static int hns3_client_init(struct hnae3_handle *handle)
 {
        struct pci_dev *pdev = handle->pdev;
+       struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);
        u16 alloc_tqps, max_rss_size;
        struct hns3_nic_priv *priv;
        struct net_device *netdev;
@@ -4007,6 +4015,7 @@ static int hns3_client_init(struct hnae3_handle *handle)
        priv->netdev = netdev;
        priv->ae_handle = handle;
        priv->tx_timeout_count = 0;
+       priv->max_non_tso_bd_num = ae_dev->dev_specs.max_non_tso_bd_num;
        set_bit(HNS3_NIC_STATE_DOWN, &priv->state);
 
        handle->msg_enable = netif_msg_init(debug, DEFAULT_MSG_LEVEL);

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
index 8a6c8ba..35b0375 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -167,13 +167,12 @@ enum hns3_nic_state {
 #define HNS3_VECTOR_INITED                     1
 
 #define HNS3_MAX_BD_SIZE                       65535
-#define HNS3_MAX_NON_TSO_BD_NUM                        8U
 #define HNS3_MAX_TSO_BD_NUM                    63U
 #define HNS3_MAX_TSO_SIZE \
        (HNS3_MAX_BD_SIZE * HNS3_MAX_TSO_BD_NUM)
 
-#define HNS3_MAX_NON_TSO_SIZE \
-       (HNS3_MAX_BD_SIZE * HNS3_MAX_NON_TSO_BD_NUM)
+#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
@@ -475,6 +474,7 @@ struct hns3_nic_priv {
        struct hns3_enet_ring *ring;
        struct hns3_enet_tqp_vector *tqp_vector;
        u16 vector_num;
+       u8 max_non_tso_bd_num;
 
        u64 tx_timeout_count;