Skip to content

K
Kernel

openeuler / Kernel
1 年多 前同步成功

通知 8
Star 0
Fork 0
K
Kernel
切换分支/标签
  1. 17 7月, 2018 26 次提交
  3. 16 7月, 2018 14 次提交
    • D
      Merge branch 'TLS-offload-rx-netdev-and-mlx5' · aea06eb2
      由 David S. Miller 提交于 
      Boris Pismenny says:

====================
TLS offload rx, netdev & mlx5

The following series provides TLS RX inline crypto offload.

v5->v4:
    - Remove the Kconfig to mutually exclude both IPsec and TLS

v4->v3:
    - Remove the iov revert for zero copy send flow

v2->v3:
    - Fix typo
    - Adjust cover letter
    - Fix bug in zero copy flows
    - Use network byte order for the record number in resync
    - Adjust the sequence provided in resync

v1->v2:
    - Fix bisectability problems due to variable name changes
    - Fix potential uninitialized return value

This series completes the generic infrastructure to offload TLS crypto to
a network devices. It enables the kernel TLS socket to skip decryption and
authentication operations for SKBs marked as decrypted on the receive
side of the data path. Leaving those computationally expensive operations
to the NIC.

This infrastructure doesn't require a TCP offload engine. Instead, the
NIC decrypts a packet's payload if the packet contains the expected TCP
sequence number. The TLS record authentication tag remains unmodified
regardless of decryption. If the packet is decrypted successfully and it
contains an authentication tag, then the authentication check has passed.
Otherwise, if the authentication fails, then the packet is provided
unmodified and the KTLS layer is responsible for handling it.
Out-Of-Order TCP packets are provided unmodified. As a result,
in the slow path some of the SKBs are decrypted while others remain as
ciphertext.

The GRO and TCP layers must not coalesce decrypted and non-decrypted SKBs.
At the worst case a received TLS record consists of both plaintext
and ciphertext packets. These partially decrypted records must be
reencrypted, only to be decrypted.

The notable differences between SW KTLS and NIC offloaded TLS
implementations are as follows:
1. Partial decryption - Software must handle the case of a TLS record
that was only partially decrypted by HW. This can happen due to packet
reordering.
2. Resynchronization - tls_read_size calls the device driver to
resynchronize HW whenever it lost track of the TLS record framing in
the TCP stream.

The infrastructure should be extendable to support various NIC offload
implementations.  However it is currently written with the
implementation below in mind:
The NIC identifies packets that should be offloaded according to
the 5-tuple and the TCP sequence number. If these match and the
packet is decrypted and authenticated successfully, then a syndrome
is provided to software. Otherwise, the packet is unmodified.
Decrypted and non-decrypted packets aren't coalesced by the network stack,
and the KTLS layer decrypts and authenticates partially decrypted records.
The NIC provides an indication whenever a resync is required. The resync
operation is triggered by the KTLS layer while parsing TLS record headers.

Finally, we measure the performance obtained by running single stream
iperf with two Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz machines connected
back-to-back with Innova TLS (40Gbps) NICs. We compare TCP (upper bound)
and KTLS-Offload running both in Tx and Rx. The results show that the
performance of offload is comparable to TCP.

                          | Bandwidth (Gbps) | CPU Tx (%) | CPU rx (%)
TCP                       | 28.8             | 5          | 12
KTLS-Offload-Tx-Rx 	  | 28.6	     | 7          | 14

Paper: https://netdevconf.org/2.2/papers/pismenny-tlscrypto-talk.pdf
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      aea06eb2
    • B
      net/mlx5e: IPsec, fix byte count in CQE · b3ccf978
      由 Boris Pismenny 提交于 
      This patch fixes the byte count indication in CQE for processed IPsec
packets that contain a metadata header.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      b3ccf978
    • B
      net/mlx5: Accel, add common metadata functions · 10e71acc
      由 Boris Pismenny 提交于 
      This patch adds common functions to handle mellanox metadata headers.
These functions are used by IPsec and TLS to process FPGA metadata.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      10e71acc
    • B
      net/mlx5e: TLS, build TLS netdev from capabilities · 790af90c
      由 Boris Pismenny 提交于 
      This patch enables TLS Rx based on available HW capabilities.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      790af90c
    • B
      net/mlx5e: TLS, add software statistics · afd3baaa
      由 Boris Pismenny 提交于 
      This patch adds software statistics for TLS to count important
events.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      afd3baaa
    • B
      net/mlx5e: TLS, add Innova TLS rx data path · 00aebab2
      由 Boris Pismenny 提交于 
      Implement the TLS rx offload data path according to the
requirements of the TLS generic NIC offload infrastructure.

Special metadata ethertype is used to pass information to
the hardware.

When hardware loses synchronization a special resync request
metadata message is used to request resync.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NIlya Lesokhin <ilyal@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      00aebab2
    • B
      net/mlx5e: TLS, add innova rx support · ca942c78
      由 Boris Pismenny 提交于 
      Add the mlx5 implementation of the TLS Rx routines to add/del TLS
contexts, also add the tls_dev_resync_rx routine
to work with the TLS inline Rx crypto offload infrastructure.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NIlya Lesokhin <ilyal@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ca942c78
    • B
      net/mlx5: Accel, add TLS rx offload routines · ab412e1d
      由 Boris Pismenny 提交于 
      In Innova TLS, TLS contexts are added or deleted
via a command message over the SBU connection.
The HW then sends a response message over the same connection.

Complete the implementation for Innova TLS (FPGA-based) hardware by
adding support for rx inline crypto offload.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NIlya Lesokhin <ilyal@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      ab412e1d
    • B
      net/mlx5e: TLS, refactor variable names · 0aadb2fc
      由 Boris Pismenny 提交于 
      For symmetry, we rename mlx5e_tls_offload_context to
mlx5e_tls_offload_context_tx before we add mlx5e_tls_offload_context_rx.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Reviewed-by: NAviad Yehezkel <aviadye@mellanox.com>
Reviewed-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      0aadb2fc
    • B
      tls: Fix zerocopy_from_iter iov handling · 47187998
      由 Boris Pismenny 提交于 
      zerocopy_from_iter iterates over the message, but it doesn't revert the
updates made by the iov iteration. This patch fixes it. Now, the iov can
be used after calling zerocopy_from_iter.

Fixes: 3c4d7559 ("tls: kernel TLS support")
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      47187998
    • B
      tls: Add rx inline crypto offload · 4799ac81
      由 Boris Pismenny 提交于 
      This patch completes the generic infrastructure to offload TLS crypto to a
network device. It enables the kernel to skip decryption and
authentication of some skbs marked as decrypted by the NIC. In the fast
path, all packets received are decrypted by the NIC and the performance
is comparable to plain TCP.

This infrastructure doesn't require a TCP offload engine. Instead, the
NIC only decrypts packets that contain the expected TCP sequence number.
Out-Of-Order TCP packets are provided unmodified. As a result, at the
worst case a received TLS record consists of both plaintext and ciphertext
packets. These partially decrypted records must be reencrypted,
only to be decrypted.

The notable differences between SW KTLS Rx and this offload are as
follows:
1. Partial decryption - Software must handle the case of a TLS record
that was only partially decrypted by HW. This can happen due to packet
reordering.
2. Resynchronization - tls_read_size calls the device driver to
resynchronize HW after HW lost track of TLS record framing in
the TCP stream.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      4799ac81
    • B
      tls: Fill software context without allocation · b190a587
      由 Boris Pismenny 提交于 
      This patch allows tls_set_sw_offload to fill the context in case it was
already allocated previously.

We will use it in TLS_DEVICE to fill the RX software context.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      b190a587
    • B
      tls: Split tls_sw_release_resources_rx · 39f56e1a
      由 Boris Pismenny 提交于 
      This patch splits tls_sw_release_resources_rx into two functions one
which releases all inner software tls structures and another that also
frees the containing structure.

In TLS_DEVICE we will need to release the software structures without
freeeing the containing structure, which contains other information.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      39f56e1a
    • B
      tls: Split decrypt_skb to two functions · dafb67f3
      由 Boris Pismenny 提交于 
      Previously, decrypt_skb also updated the TLS context.
Now, decrypt_skb only decrypts the payload using the current context,
while decrypt_skb_update also updates the state.

Later, in the tls_device Rx flow, we will use decrypt_skb directly.
Signed-off-by: NBoris Pismenny <borisp@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      dafb67f3