diff options
author | Igor Russkikh <irusskikh@marvell.com> | 2019-11-07 22:42:06 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2019-11-07 19:54:43 -0800 |
commit | 822cd114cd05a47b7c272de9b3a4da73114894ca (patch) | |
tree | ca561e2124bacc2ca21686ef92fcccd18c4bbd17 /drivers/net/ethernet | |
parent | 8009bb1928a6d5b0ce2d8a1dba79972f01e50533 (diff) | |
download | linux-822cd114cd05a47b7c272de9b3a4da73114894ca.tar.bz2 |
net: atlantic: implement UDP GSO offload
atlantic hardware does support UDP hardware segmentation offload.
This allows user to specify one large contiguous buffer with data
which then will be split automagically into multiple UDP packets
of specified size.
Bulk sending of large UDP streams lowers CPU usage and increases
bandwidth.
We did estimations both with udpgso_bench_tx test tool and with modified
iperf3 measurement tool (4 streams, multithread, 200b packet size)
over AQC<->AQC 10G link. Flow control is disabled to prevent RX side
impact on measurements.
No UDP GSO:
iperf3 -c 10.0.1.2 -u -b0 -l 200 -P4 --multithread
UDP GSO:
iperf3 -c 10.0.1.2 -u -b0 -l 12600 --udp-lso 200 -P4 --multithread
Mode CPU iperf speed Line speed Packets per second
-------------------------------------------------------------
NO UDP GSO 350% 3.07 Gbps 3.8 Gbps 1,919,419
SW UDP GSO 200% 5.55 Gbps 6.4 Gbps 3,286,144
HW UDP GSO 90% 6.80 Gbps 8.4 Gbps 4,273,117
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
4 files changed, 40 insertions, 32 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c index 7ad8eb535d28..a17a4da7bc15 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c @@ -309,6 +309,7 @@ void aq_nic_ndev_init(struct aq_nic_s *self) self->ndev->vlan_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_RXHASH | NETIF_F_SG | NETIF_F_LRO | NETIF_F_TSO; + self->ndev->gso_partial_features = NETIF_F_GSO_UDP_L4; self->ndev->priv_flags = aq_hw_caps->hw_priv_flags; self->ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE; @@ -472,11 +473,18 @@ unsigned int aq_nic_map_skb(struct aq_nic_s *self, struct sk_buff *skb, { unsigned int nr_frags = skb_shinfo(skb)->nr_frags; struct aq_ring_buff_s *first = NULL; + u8 ipver = ip_hdr(skb)->version; struct aq_ring_buff_s *dx_buff; bool need_context_tag = false; unsigned int frag_count = 0U; unsigned int ret = 0U; unsigned int dx; + u8 l4proto = 0; + + if (ipver == 4) + l4proto = ip_hdr(skb)->protocol; + else if (ipver == 6) + l4proto = ipv6_hdr(skb)->nexthdr; dx = ring->sw_tail; dx_buff = &ring->buff_ring[dx]; @@ -484,14 +492,24 @@ unsigned int aq_nic_map_skb(struct aq_nic_s *self, struct sk_buff *skb, if (unlikely(skb_is_gso(skb))) { dx_buff->mss = skb_shinfo(skb)->gso_size; - dx_buff->is_gso = 1U; + if (l4proto == IPPROTO_TCP) { + dx_buff->is_gso_tcp = 1U; + dx_buff->len_l4 = tcp_hdrlen(skb); + } else if (l4proto == IPPROTO_UDP) { + dx_buff->is_gso_udp = 1U; + dx_buff->len_l4 = sizeof(struct udphdr); + /* UDP GSO Hardware does not replace packet length. */ + udp_hdr(skb)->len = htons(dx_buff->mss + + dx_buff->len_l4); + } else { + WARN_ONCE(true, "Bad GSO mode"); + goto exit; + } dx_buff->len_pkt = skb->len; dx_buff->len_l2 = ETH_HLEN; - dx_buff->len_l3 = ip_hdrlen(skb); - dx_buff->len_l4 = tcp_hdrlen(skb); + dx_buff->len_l3 = skb_network_header_len(skb); dx_buff->eop_index = 0xffffU; - dx_buff->is_ipv6 = - (ip_hdr(skb)->version == 6) ? 1U : 0U; + dx_buff->is_ipv6 = (ipver == 6); need_context_tag = true; } @@ -525,24 +543,9 @@ unsigned int aq_nic_map_skb(struct aq_nic_s *self, struct sk_buff *skb, ++ret; if (skb->ip_summed == CHECKSUM_PARTIAL) { - dx_buff->is_ip_cso = (htons(ETH_P_IP) == skb->protocol) ? - 1U : 0U; - - if (ip_hdr(skb)->version == 4) { - dx_buff->is_tcp_cso = - (ip_hdr(skb)->protocol == IPPROTO_TCP) ? - 1U : 0U; - dx_buff->is_udp_cso = - (ip_hdr(skb)->protocol == IPPROTO_UDP) ? - 1U : 0U; - } else if (ip_hdr(skb)->version == 6) { - dx_buff->is_tcp_cso = - (ipv6_hdr(skb)->nexthdr == NEXTHDR_TCP) ? - 1U : 0U; - dx_buff->is_udp_cso = - (ipv6_hdr(skb)->nexthdr == NEXTHDR_UDP) ? - 1U : 0U; - } + dx_buff->is_ip_cso = (htons(ETH_P_IP) == skb->protocol); + dx_buff->is_tcp_cso = (l4proto == IPPROTO_TCP); + dx_buff->is_udp_cso = (l4proto == IPPROTO_UDP); } for (; nr_frags--; ++frag_count) { @@ -597,7 +600,8 @@ mapping_error: --ret, dx = aq_ring_next_dx(ring, dx)) { dx_buff = &ring->buff_ring[dx]; - if (!dx_buff->is_gso && !dx_buff->is_vlan && dx_buff->pa) { + if (!(dx_buff->is_gso_tcp || dx_buff->is_gso_udp) && + !dx_buff->is_vlan && dx_buff->pa) { if (unlikely(dx_buff->is_sop)) { dma_unmap_single(aq_nic_get_dev(self), dx_buff->pa, diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.h b/drivers/net/ethernet/aquantia/atlantic/aq_ring.h index be3702a4dcc9..991e4d31b094 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.h +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.h @@ -65,19 +65,20 @@ struct __packed aq_ring_buff_s { }; union { struct { - u16 len; + u32 len:16; u32 is_ip_cso:1; u32 is_udp_cso:1; u32 is_tcp_cso:1; u32 is_cso_err:1; u32 is_sop:1; u32 is_eop:1; - u32 is_gso:1; + u32 is_gso_tcp:1; + u32 is_gso_udp:1; u32 is_mapped:1; u32 is_cleaned:1; u32 is_error:1; u32 is_vlan:1; - u32 rsvd3:5; + u32 rsvd3:4; u16 eop_index; u16 rsvd4; }; diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c index 03b62d7d9f1a..9b1062b8af64 100644 --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_a0.c @@ -454,7 +454,7 @@ static int hw_atl_a0_hw_ring_tx_xmit(struct aq_hw_s *self, buff = &ring->buff_ring[ring->sw_tail]; - if (buff->is_gso) { + if (buff->is_gso_tcp) { txd->ctl |= (buff->len_l3 << 31) | (buff->len_l2 << 24) | HW_ATL_A0_TXD_CTL_CMD_TCP | diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c index c5da60c12262..58e891af6e09 100644 --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_b0.c @@ -43,7 +43,9 @@ NETIF_F_NTUPLE | \ NETIF_F_HW_VLAN_CTAG_FILTER | \ NETIF_F_HW_VLAN_CTAG_RX | \ - NETIF_F_HW_VLAN_CTAG_TX, \ + NETIF_F_HW_VLAN_CTAG_TX | \ + NETIF_F_GSO_UDP_L4 | \ + NETIF_F_GSO_PARTIAL, \ .hw_priv_flags = IFF_UNICAST_FLT, \ .flow_control = true, \ .mtu = HW_ATL_B0_MTU_JUMBO, \ @@ -533,8 +535,9 @@ static int hw_atl_b0_hw_ring_tx_xmit(struct aq_hw_s *self, buff = &ring->buff_ring[ring->sw_tail]; - if (buff->is_gso) { - txd->ctl |= HW_ATL_B0_TXD_CTL_CMD_TCP; + if (buff->is_gso_tcp || buff->is_gso_udp) { + if (buff->is_gso_tcp) + txd->ctl |= HW_ATL_B0_TXD_CTL_CMD_TCP; txd->ctl |= HW_ATL_B0_TXD_CTL_DESC_TYPE_TXC; txd->ctl |= (buff->len_l3 << 31) | (buff->len_l2 << 24); @@ -554,7 +557,7 @@ static int hw_atl_b0_hw_ring_tx_xmit(struct aq_hw_s *self, txd->ctl |= buff->vlan_tx_tag << 4; is_vlan = true; } - if (!buff->is_gso && !buff->is_vlan) { + if (!buff->is_gso_tcp && !buff->is_gso_udp && !buff->is_vlan) { buff_pa_len = buff->len; txd->buf_addr = buff->pa; |