Commit d0a1299c authored by Ganesh Goudar's avatar Ganesh Goudar Committed by David S. Miller

cxgb4: add support for vxlan segmentation offload

add changes to t4_eth_xmit to enable vxlan segmentation
offload support.

Original work by: Santosh Rastapur <santosh@chelsio.com>
Signed-off-by: default avatarGanesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 846eac3f
......@@ -1314,6 +1314,7 @@ void t4_sge_start(struct adapter *adap);
void t4_sge_stop(struct adapter *adap);
void cxgb4_set_ethtool_ops(struct net_device *netdev);
int cxgb4_write_rss(const struct port_info *pi, const u16 *queues);
enum cpl_tx_tnl_lso_type cxgb_encap_offload_supported(struct sk_buff *skb);
extern int dbfifo_int_thresh;
#define for_each_port(adapter, iter) \
......
......@@ -5210,6 +5210,10 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
NETIF_F_RXCSUM | NETIF_F_RXHASH |
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_TC;
if (CHELSIO_CHIP_VERSION(chip) > CHELSIO_T5)
netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
if (highdma)
netdev->hw_features |= NETIF_F_HIGHDMA;
netdev->features |= netdev->hw_features;
......
......@@ -770,12 +770,19 @@ static inline unsigned int flits_to_desc(unsigned int n)
* Returns whether an Ethernet packet is small enough to fit as
* immediate data. Return value corresponds to headroom required.
*/
static inline int is_eth_imm(const struct sk_buff *skb)
static inline int is_eth_imm(const struct sk_buff *skb, unsigned int chip_ver)
{
int hdrlen = skb_shinfo(skb)->gso_size ?
sizeof(struct cpl_tx_pkt_lso_core) : 0;
int hdrlen = 0;
if (skb->encapsulation && skb_shinfo(skb)->gso_size &&
chip_ver > CHELSIO_T5) {
hdrlen = sizeof(struct cpl_tx_tnl_lso);
hdrlen += sizeof(struct cpl_tx_pkt_core);
} else {
hdrlen = skb_shinfo(skb)->gso_size ?
sizeof(struct cpl_tx_pkt_lso_core) : 0;
hdrlen += sizeof(struct cpl_tx_pkt);
}
if (skb->len <= MAX_IMM_TX_PKT_LEN - hdrlen)
return hdrlen;
return 0;
......@@ -788,10 +795,11 @@ static inline int is_eth_imm(const struct sk_buff *skb)
* Returns the number of flits needed for a Tx WR for the given Ethernet
* packet, including the needed WR and CPL headers.
*/
static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
static inline unsigned int calc_tx_flits(const struct sk_buff *skb,
unsigned int chip_ver)
{
unsigned int flits;
int hdrlen = is_eth_imm(skb);
int hdrlen = is_eth_imm(skb, chip_ver);
/* If the skb is small enough, we can pump it out as a work request
* with only immediate data. In that case we just have to have the
......@@ -810,13 +818,20 @@ static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
* with an embedded TX Packet Write CPL message.
*/
flits = sgl_len(skb_shinfo(skb)->nr_frags + 1);
if (skb_shinfo(skb)->gso_size)
flits += (sizeof(struct fw_eth_tx_pkt_wr) +
sizeof(struct cpl_tx_pkt_lso_core) +
sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64);
if (skb_shinfo(skb)->gso_size) {
if (skb->encapsulation && chip_ver > CHELSIO_T5)
hdrlen = sizeof(struct fw_eth_tx_pkt_wr) +
sizeof(struct cpl_tx_tnl_lso);
else
hdrlen = sizeof(struct fw_eth_tx_pkt_wr) +
sizeof(struct cpl_tx_pkt_lso_core);
hdrlen += sizeof(struct cpl_tx_pkt_core);
flits += (hdrlen / sizeof(__be64));
} else {
flits += (sizeof(struct fw_eth_tx_pkt_wr) +
sizeof(struct cpl_tx_pkt_core)) / sizeof(__be64);
}
return flits;
}
......@@ -827,9 +842,10 @@ static inline unsigned int calc_tx_flits(const struct sk_buff *skb)
* Returns the number of Tx descriptors needed for the given Ethernet
* packet, including the needed WR and CPL headers.
*/
static inline unsigned int calc_tx_descs(const struct sk_buff *skb)
static inline unsigned int calc_tx_descs(const struct sk_buff *skb,
unsigned int chip_ver)
{
return flits_to_desc(calc_tx_flits(skb));
return flits_to_desc(calc_tx_flits(skb, chip_ver));
}
/**
......@@ -1154,6 +1170,102 @@ cxgb_fcoe_offload(struct sk_buff *skb, struct adapter *adap,
}
#endif /* CONFIG_CHELSIO_T4_FCOE */
/* Returns tunnel type if hardware supports offloading of the same.
* It is called only for T5 and onwards.
*/
enum cpl_tx_tnl_lso_type cxgb_encap_offload_supported(struct sk_buff *skb)
{
u8 l4_hdr = 0;
enum cpl_tx_tnl_lso_type tnl_type = TX_TNL_TYPE_OPAQUE;
struct port_info *pi = netdev_priv(skb->dev);
struct adapter *adapter = pi->adapter;
if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
skb->inner_protocol != htons(ETH_P_TEB))
return tnl_type;
switch (vlan_get_protocol(skb)) {
case htons(ETH_P_IP):
l4_hdr = ip_hdr(skb)->protocol;
break;
case htons(ETH_P_IPV6):
l4_hdr = ipv6_hdr(skb)->nexthdr;
break;
default:
return tnl_type;
}
switch (l4_hdr) {
case IPPROTO_UDP:
if (adapter->vxlan_port == udp_hdr(skb)->dest)
tnl_type = TX_TNL_TYPE_VXLAN;
break;
default:
return tnl_type;
}
return tnl_type;
}
static inline void t6_fill_tnl_lso(struct sk_buff *skb,
struct cpl_tx_tnl_lso *tnl_lso,
enum cpl_tx_tnl_lso_type tnl_type)
{
u32 val;
int in_eth_xtra_len;
int l3hdr_len = skb_network_header_len(skb);
int eth_xtra_len = skb_network_offset(skb) - ETH_HLEN;
const struct skb_shared_info *ssi = skb_shinfo(skb);
bool v6 = (ip_hdr(skb)->version == 6);
val = CPL_TX_TNL_LSO_OPCODE_V(CPL_TX_TNL_LSO) |
CPL_TX_TNL_LSO_FIRST_F |
CPL_TX_TNL_LSO_LAST_F |
(v6 ? CPL_TX_TNL_LSO_IPV6OUT_F : 0) |
CPL_TX_TNL_LSO_ETHHDRLENOUT_V(eth_xtra_len / 4) |
CPL_TX_TNL_LSO_IPHDRLENOUT_V(l3hdr_len / 4) |
(v6 ? 0 : CPL_TX_TNL_LSO_IPHDRCHKOUT_F) |
CPL_TX_TNL_LSO_IPLENSETOUT_F |
(v6 ? 0 : CPL_TX_TNL_LSO_IPIDINCOUT_F);
tnl_lso->op_to_IpIdSplitOut = htonl(val);
tnl_lso->IpIdOffsetOut = 0;
/* Get the tunnel header length */
val = skb_inner_mac_header(skb) - skb_mac_header(skb);
in_eth_xtra_len = skb_inner_network_header(skb) -
skb_inner_mac_header(skb) - ETH_HLEN;
switch (tnl_type) {
case TX_TNL_TYPE_VXLAN:
tnl_lso->UdpLenSetOut_to_TnlHdrLen =
htons(CPL_TX_TNL_LSO_UDPCHKCLROUT_F |
CPL_TX_TNL_LSO_UDPLENSETOUT_F);
break;
default:
tnl_lso->UdpLenSetOut_to_TnlHdrLen = 0;
break;
}
tnl_lso->UdpLenSetOut_to_TnlHdrLen |=
htons(CPL_TX_TNL_LSO_TNLHDRLEN_V(val) |
CPL_TX_TNL_LSO_TNLTYPE_V(tnl_type));
tnl_lso->r1 = 0;
val = CPL_TX_TNL_LSO_ETHHDRLEN_V(in_eth_xtra_len / 4) |
CPL_TX_TNL_LSO_IPV6_V(inner_ip_hdr(skb)->version == 6) |
CPL_TX_TNL_LSO_IPHDRLEN_V(skb_inner_network_header_len(skb) / 4) |
CPL_TX_TNL_LSO_TCPHDRLEN_V(inner_tcp_hdrlen(skb) / 4);
tnl_lso->Flow_to_TcpHdrLen = htonl(val);
tnl_lso->IpIdOffset = htons(0);
tnl_lso->IpIdSplit_to_Mss = htons(CPL_TX_TNL_LSO_MSS_V(ssi->gso_size));
tnl_lso->TCPSeqOffset = htonl(0);
tnl_lso->EthLenOffset_Size = htonl(CPL_TX_TNL_LSO_SIZE_V(skb->len));
}
/**
* t4_eth_xmit - add a packet to an Ethernet Tx queue
* @skb: the packet
......@@ -1177,6 +1289,9 @@ netdev_tx_t t4_eth_xmit(struct sk_buff *skb, struct net_device *dev)
bool immediate = false;
int len, max_pkt_len;
bool ptp_enabled = is_ptp_enabled(skb, dev);
unsigned int chip_ver;
enum cpl_tx_tnl_lso_type tnl_type = TX_TNL_TYPE_OPAQUE;
#ifdef CONFIG_CHELSIO_T4_FCOE
int err;
#endif /* CONFIG_CHELSIO_T4_FCOE */
......@@ -1227,7 +1342,8 @@ out_free: dev_kfree_skb_any(skb);
}
#endif /* CONFIG_CHELSIO_T4_FCOE */
flits = calc_tx_flits(skb);
chip_ver = CHELSIO_CHIP_VERSION(adap->params.chip);
flits = calc_tx_flits(skb, chip_ver);
ndesc = flits_to_desc(flits);
credits = txq_avail(&q->q) - ndesc;
......@@ -1241,9 +1357,12 @@ out_free: dev_kfree_skb_any(skb);
return NETDEV_TX_BUSY;
}
if (is_eth_imm(skb))
if (is_eth_imm(skb, chip_ver))
immediate = true;
if (skb->encapsulation && chip_ver > CHELSIO_T5)
tnl_type = cxgb_encap_offload_supported(skb);
if (!immediate &&
unlikely(map_skb(adap->pdev_dev, skb, addr) < 0)) {
q->mapping_err++;
......@@ -1270,10 +1389,32 @@ out_free: dev_kfree_skb_any(skb);
bool v6 = (ssi->gso_type & SKB_GSO_TCPV6) != 0;
int l3hdr_len = skb_network_header_len(skb);
int eth_xtra_len = skb_network_offset(skb) - ETH_HLEN;
struct cpl_tx_tnl_lso *tnl_lso = (void *)(wr + 1);
if (tnl_type)
len += sizeof(*tnl_lso);
else
len += sizeof(*lso);
wr->op_immdlen = htonl(FW_WR_OP_V(FW_ETH_TX_PKT_WR) |
FW_WR_IMMDLEN_V(len));
if (tnl_type) {
struct iphdr *iph = ip_hdr(skb);
t6_fill_tnl_lso(skb, tnl_lso, tnl_type);
cpl = (void *)(tnl_lso + 1);
/* Driver is expected to compute partial checksum that
* does not include the IP Total Length.
*/
if (iph->version == 4) {
iph->check = 0;
iph->tot_len = 0;
iph->check = (u16)(~ip_fast_csum((u8 *)iph,
iph->ihl));
}
if (skb->ip_summed == CHECKSUM_PARTIAL)
cntrl = hwcsum(adap->params.chip, skb);
} else {
lso->c.lso_ctrl = htonl(LSO_OPCODE_V(CPL_TX_PKT_LSO) |
LSO_FIRST_SLICE_F | LSO_LAST_SLICE_F |
LSO_IPV6_V(v6) |
......@@ -1286,10 +1427,12 @@ out_free: dev_kfree_skb_any(skb);
if (is_t4(adap->params.chip))
lso->c.len = htonl(skb->len);
else
lso->c.len = htonl(LSO_T5_XFER_SIZE_V(skb->len));
lso->c.len =
htonl(LSO_T5_XFER_SIZE_V(skb->len));
cpl = (void *)(lso + 1);
if (CHELSIO_CHIP_VERSION(adap->params.chip) <= CHELSIO_T5)
if (CHELSIO_CHIP_VERSION(adap->params.chip)
<= CHELSIO_T5)
cntrl = TXPKT_ETHHDR_LEN_V(eth_xtra_len);
else
cntrl = T6_TXPKT_ETHHDR_LEN_V(eth_xtra_len);
......@@ -1297,6 +1440,7 @@ out_free: dev_kfree_skb_any(skb);
cntrl |= TXPKT_CSUM_TYPE_V(v6 ?
TX_CSUM_TCPIP6 : TX_CSUM_TCPIP) |
TXPKT_IPHDR_LEN_V(l3hdr_len);
}
q->tso++;
q->tx_cso += ssi->gso_segs;
} else {
......
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