diff options
| author |   Somnath Kotur <somnath.kotur@broadcom.com> | 2020-11-30 08:24:45 +0530 |
|---|---|---|
| committer |   Damjan Marion <dmarion@me.com> | 2021-01-21 13:40:42 +0000 |
| commit | 09332e9bc09748dd7eea564cb47f70863374ebf8 (patch) | |
| tree | 0ff9eb4469a277749d0a780aedcc5bf2fb640a50 /src/plugins/dpdk | |
| parent | e1480a2c12ff764622dd2ae1bc9bce6cd25bcbdd (diff) | |
dpdk: do not use TSO for small packets
Asking for TSO (TCP Segmentation Offload) on packets that are already
smaller than (headers + MSS) does not make sense and may not work
on some HW.
Fix to only set the TSO flag when a segmentation offload is
really required, i.e when packet is large enough.
Type: improvement
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Change-Id: I7830ae8474581c8e518fb4910f7863e10346bb62
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Diffstat (limited to 'src/plugins/dpdk')
| -rw-r--r-- | src/plugins/dpdk/device/device.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/plugins/dpdk/device/device.c b/src/plugins/dpdk/device/device.c index 4d26abde214..ec33f6a4461 100644 --- a/src/plugins/dpdk/device/device.c +++ b/src/plugins/dpdk/device/device.c @@ -222,7 +222,7 @@ dpdk_buffer_tx_offload (dpdk_device_t * xd, vlib_buffer_t * b, u32 tcp_cksum = b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; u32 udp_cksum = b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM; int is_ip4 = b->flags & VNET_BUFFER_F_IS_IP4; - u32 tso = b->flags & VNET_BUFFER_F_GSO; + u32 tso = b->flags & VNET_BUFFER_F_GSO, max_pkt_len; u64 ol_flags; /* Is there any work for us? */ @@ -238,12 +238,15 @@ dpdk_buffer_tx_offload (dpdk_device_t * xd, vlib_buffer_t * b, ol_flags |= ip_cksum ? PKT_TX_IP_CKSUM : 0; ol_flags |= tcp_cksum ? PKT_TX_TCP_CKSUM : 0; ol_flags |= udp_cksum ? PKT_TX_UDP_CKSUM : 0; - ol_flags |= tso ? (tcp_cksum ? PKT_TX_TCP_SEG : PKT_TX_UDP_SEG) : 0; if (tso) { mb->l4_len = vnet_buffer2 (b)->gso_l4_hdr_sz; mb->tso_segsz = vnet_buffer2 (b)->gso_size; + /* ensure packet is large enough to require tso */ + max_pkt_len = mb->l2_len + mb->l3_len + mb->l4_len + mb->tso_segsz; + if (mb->tso_segsz != 0 && mb->pkt_len > max_pkt_len) + ol_flags |= (tcp_cksum ? PKT_TX_TCP_SEG : PKT_TX_UDP_SEG); } mb->ol_flags |= ol_flags; |