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net: hns3: add 8 BD limit for tx flow

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A single transmit packet can span up to 8 descriptors according
to the HW limit. If a skb has more than 8 frags, driver uses
skb_copy to get a new skb which has less frags.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peng Li 2019-01-27 00:49:19 +08:00 committed by David S. Miller
parent 1cce5eb650
commit 51e8439f34
1 changed files with 27 additions and 1 deletions
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28
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
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@ -1133,6 +1133,7 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum,
struct hns3_enet_ring *ring)
{
struct sk_buff *skb = *out_skb;
struct sk_buff *new_skb = NULL;
struct skb_frag_struct *frag;
int bdnum_for_frag;
int frag_num;
@ -1155,7 +1156,19 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum,
buf_num += bdnum_for_frag;
}
if (buf_num > ring_space(ring))
if (unlikely(buf_num > HNS3_MAX_BD_PER_FRAG)) {
buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
if (ring_space(ring) < buf_num)
return -EBUSY;
/* manual split the send packet */
new_skb = skb_copy(skb, GFP_ATOMIC);
if (!new_skb)
return -ENOMEM;
dev_kfree_skb_any(skb);
*out_skb = new_skb;
}
if (unlikely(ring_space(ring) < buf_num))
return -EBUSY;
*bnum = buf_num;
@ -1166,11 +1179,24 @@ static int hns3_nic_maybe_stop_tx(struct sk_buff **out_skb, int *bnum,
struct hns3_enet_ring *ring)
{
struct sk_buff *skb = *out_skb;
struct sk_buff *new_skb = NULL;
int buf_num;
/* No. of segments (plus a header) */
buf_num = skb_shinfo(skb)->nr_frags + 1;
if (unlikely(buf_num > HNS3_MAX_BD_PER_FRAG)) {
buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
if (ring_space(ring) < buf_num)
return -EBUSY;
/* manual split the send packet */
new_skb = skb_copy(skb, GFP_ATOMIC);
if (!new_skb)
return -ENOMEM;
dev_kfree_skb_any(skb);
*out_skb = new_skb;
}
if (unlikely(ring_space(ring) < buf_num))
return -EBUSY;