diff options
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index 453fdf43136a..944e0aecb816 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -1181,6 +1181,47 @@ static int hns3_nic_bd_num(struct sk_buff *skb) return bd_num; } +static unsigned int hns3_gso_hdr_len(struct sk_buff *skb) +{ + if (!skb->encapsulation) + return skb_transport_offset(skb) + tcp_hdrlen(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. + */ +static bool hns3_skb_need_linearized(struct sk_buff *skb) +{ + int bd_limit = HNS3_MAX_BD_PER_FRAG - 1; + unsigned int tot_len = 0; + int i; + + for (i = 0; i < bd_limit; i++) + tot_len += skb_frag_size(&skb_shinfo(skb)->frags[i]); + + /* ensure headlen + the first 7 frags is greater than mss + header + * and the first 7 frags is greater than mss. + */ + if (((tot_len + skb_headlen(skb)) < (skb_shinfo(skb)->gso_size + + hns3_gso_hdr_len(skb))) || (tot_len < skb_shinfo(skb)->gso_size)) + return true; + + /* ensure the remaining continuous 7 buffer is greater than mss */ + for (i = 0; i < (skb_shinfo(skb)->nr_frags - bd_limit - 1); i++) { + tot_len -= skb_frag_size(&skb_shinfo(skb)->frags[i]); + tot_len += skb_frag_size(&skb_shinfo(skb)->frags[i + bd_limit]); + + if (tot_len < skb_shinfo(skb)->gso_size) + return true; + } + + return false; +} + static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring, struct sk_buff **out_skb) { @@ -1194,6 +1235,9 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring, if (unlikely(bd_num > HNS3_MAX_BD_PER_FRAG)) { struct sk_buff *new_skb; + if (skb_is_gso(skb) && !hns3_skb_need_linearized(skb)) + goto out; + bd_num = hns3_tx_bd_count(skb->len); if (unlikely(ring_space(ring) < bd_num)) return -EBUSY; @@ -1209,6 +1253,7 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring, u64_stats_update_end(&ring->syncp); } +out: if (unlikely(ring_space(ring) < bd_num)) return -EBUSY; |