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authorYunsheng Lin <linyunsheng@huawei.com>2019-05-06 10:48:44 +0800
committerDavid S. Miller <davem@davemloft.net>2019-05-07 10:37:13 -0700
commitdb4970aa92a148389826057290cd45bb30f5650e (patch)
treee5e37fd7844c691f71cee412930990053f865adc /drivers
parentd21ff4f90d975f5027678eb84e0d53fb8ca19c9b (diff)
downloadlinux-db4970aa92a148389826057290cd45bb30f5650e.tar.bz2
net: hns3: add linearizing checking for TSO case
HW requires 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. This patch adds hns3_skb_need_linearized to handle it for TSO case. Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com> Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/hisilicon/hns3/hns3_enet.c45
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;