在 2024/1/9 上午12:04, Kumara Parameshwaran 写道:
In the current implementation when a packet is received with
special TCP flag(s) set, only that packet is delivered out of order.
There could be already coalesced packets in the GRO table
belonging to the same flow but not delivered.
This fix makes sure that the entire segment is delivered with the
special flag(s) set which is how the Linux GRO is also implemented
Signed-off-by: Kumara Parameshwaran <kumaraparames...@gmail.com>
---
If the received packet is not a pure ACK packet, we check if
there are any previous packets in the flow, if present we indulge
the received packet also in the coalescing logic and update the flags
of the last recived packet to the entire segment which would avoid
re-ordering.
Lets say a case where P1(PSH), P2(ACK), P3(ACK) are received in burst
mode,
P1 contains PSH flag and since it does not contain any prior packets in
the flow
we copy it to unprocess_packets and P2(ACK) and P3(ACK) are merged
together.
In the existing case the P2,P3 would be delivered as single segment
first and the
unprocess_packets will be copied later which will cause reordering.
With the patch
copy the unprocess packets first and then the packets from the GRO
table.
Testing done
The csum test-pmd was modified to support the following
GET request of 10MB from client to server via test-pmd (static arp
entries added in client
and server). Enable GRO and TSO in test-pmd where the packets recived
from the client mac
would be sent to server mac and vice versa.
In above testing, without the patch the client observerd re-ordering of
25 packets
and with the patch there were no packet re-ordering observerd.
v2:
Fix warnings in commit and comment.
Do not consider packet as candidate to merge if it contains SYN/RST
flag.
v3:
Fix warnings.
v4:
Rebase with master.
v5:
Adding co-author email
v6:
Address review comments from the maintainer to restructure the code
and handle only special flags PSH,FIN
v7:
Fix warnings and errors
v8:
Fix warnings and errors
v9:
Fix commit message
v10:
Update tcp header flags and address review comments
v11:
Fix warnings
v12:
Fix nit review comments
v13:
Fix warnings
lib/gro/gro_tcp.h | 9 +++++++++
lib/gro/gro_tcp4.c | 36 +++++++++++++++++++++++++++---------
lib/gro/gro_tcp_internal.h | 2 +-
lib/gro/gro_vxlan_tcp4.c | 5 +++--
4 files changed, 40 insertions(+), 12 deletions(-)
Reviewed-by: Jiayu Hu <hujiayu...@foxmail.com>
Thanks,
Jiayu
