mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-02 08:39:08 -04:00
Code Issues Packages Projects Releases Wiki Activity

net: hns3: add linearizing checking for TSO case

Browse Source 
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>
This commit is contained in:
Yunsheng Lin
2019-05-06 10:48:44 +08:00
committed by David S. Miller
parent d21ff4f90d
commit db4970aa92
1 changed files with 45 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View File

@@ -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;