[PATCH net-next 10/10] net: hns3: split function hns3_set_l2l3l4()
From: Guangbin Huang <hidden>
Date: 2021-11-29 14:07:32
Also in:
lkml
Subsystem:
hisilicon network subsystem 3 driver (hns3), hisilicon network subsystem driver, networking drivers, the rest · Maintainers:
Jian Shen, Jijie Shao, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Yufeng Mo <redacted> Function hns3_set_l2l3l4() is a bit too long. So add two new functions hns3_set_l3_type() and hns3_set_l4_csum_length() to simplify code and improve code readability. Signed-off-by: Yufeng Mo <redacted> Signed-off-by: Guangbin Huang <redacted> --- .../net/ethernet/hisilicon/hns3/hns3_enet.c | 102 ++++++++++-------- 1 file changed, 57 insertions(+), 45 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 5fc8f9dc6e3e..8c7707263f9d 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c@@ -1355,44 +1355,9 @@ static void hns3_set_outer_l2l3l4(struct sk_buff *skb, u8 ol4_proto, HNS3_TUN_NVGRE); } -static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto, - u8 il4_proto, u32 *type_cs_vlan_tso, - u32 *ol_type_vlan_len_msec) +static void hns3_set_l3_type(struct sk_buff *skb, union l3_hdr_info l3, + u32 *type_cs_vlan_tso) { - unsigned char *l2_hdr = skb->data; - u32 l4_proto = ol4_proto; - union l4_hdr_info l4; - union l3_hdr_info l3; - u32 l2_len, l3_len; - - l4.hdr = skb_transport_header(skb); - l3.hdr = skb_network_header(skb); - - /* handle encapsulation skb */ - if (skb->encapsulation) { - /* If this is a not UDP/GRE encapsulation skb */ - if (!(ol4_proto == IPPROTO_UDP || ol4_proto == IPPROTO_GRE)) { - /* drop the skb tunnel packet if hardware don't support, - * because hardware can't calculate csum when TSO. - */ - if (skb_is_gso(skb)) - return -EDOM; - - /* the stack computes the IP header already, - * driver calculate l4 checksum when not TSO. - */ - return skb_checksum_help(skb); - } - - hns3_set_outer_l2l3l4(skb, ol4_proto, ol_type_vlan_len_msec); - - /* switch to inner header */ - l2_hdr = skb_inner_mac_header(skb); - l3.hdr = skb_inner_network_header(skb); - l4.hdr = skb_inner_transport_header(skb); - l4_proto = il4_proto; - } - if (l3.v4->version == 4) { hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S, HNS3_L3T_IPV4);
@@ -1406,15 +1371,11 @@ static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto, hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3T_S, HNS3_L3T_IPV6); } +} - /* compute inner(/normal) L2 header size, defined in 2 Bytes */ - l2_len = l3.hdr - l2_hdr; - hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L2LEN_S, l2_len >> 1); - - /* compute inner(/normal) L3 header size, defined in 4 Bytes */ - l3_len = l4.hdr - l3.hdr; - hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3LEN_S, l3_len >> 2); - +static int hns3_set_l4_csum_length(struct sk_buff *skb, union l4_hdr_info l4, + u32 l4_proto, u32 *type_cs_vlan_tso) +{ /* compute inner(/normal) L4 header size, defined in 4 Bytes */ switch (l4_proto) { case IPPROTO_TCP:
@@ -1460,6 +1421,57 @@ static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto, return 0; } +static int hns3_set_l2l3l4(struct sk_buff *skb, u8 ol4_proto, + u8 il4_proto, u32 *type_cs_vlan_tso, + u32 *ol_type_vlan_len_msec) +{ + unsigned char *l2_hdr = skb->data; + u32 l4_proto = ol4_proto; + union l4_hdr_info l4; + union l3_hdr_info l3; + u32 l2_len, l3_len; + + l4.hdr = skb_transport_header(skb); + l3.hdr = skb_network_header(skb); + + /* handle encapsulation skb */ + if (skb->encapsulation) { + /* If this is a not UDP/GRE encapsulation skb */ + if (!(ol4_proto == IPPROTO_UDP || ol4_proto == IPPROTO_GRE)) { + /* drop the skb tunnel packet if hardware don't support, + * because hardware can't calculate csum when TSO. + */ + if (skb_is_gso(skb)) + return -EDOM; + + /* the stack computes the IP header already, + * driver calculate l4 checksum when not TSO. + */ + return skb_checksum_help(skb); + } + + hns3_set_outer_l2l3l4(skb, ol4_proto, ol_type_vlan_len_msec); + + /* switch to inner header */ + l2_hdr = skb_inner_mac_header(skb); + l3.hdr = skb_inner_network_header(skb); + l4.hdr = skb_inner_transport_header(skb); + l4_proto = il4_proto; + } + + hns3_set_l3_type(skb, l3, type_cs_vlan_tso); + + /* compute inner(/normal) L2 header size, defined in 2 Bytes */ + l2_len = l3.hdr - l2_hdr; + hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L2LEN_S, l2_len >> 1); + + /* compute inner(/normal) L3 header size, defined in 4 Bytes */ + l3_len = l4.hdr - l3.hdr; + hns3_set_field(*type_cs_vlan_tso, HNS3_TXD_L3LEN_S, l3_len >> 2); + + return hns3_set_l4_csum_length(skb, l4, l4_proto, type_cs_vlan_tso); +} + static int hns3_handle_vtags(struct hns3_enet_ring *tx_ring, struct sk_buff *skb) {
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2.33.0