2 Copyright(c) 2016 Intel Corporation. All rights reserved.
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
9 * Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11 * Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in
13 the documentation and/or other materials provided with the
15 * Neither the name of Intel Corporation nor the names of its
16 contributors may be used to endorse or promote products derived
17 from this software without specific prior written permission.
19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 .. _l2_fwd_crypto_app:
33 L2 Forwarding with Crypto Sample Application
34 ============================================
36 The L2 Forwarding with Crypto (l2fwd-crypto) sample application is a simple example of packet processing using
37 the Data Plane Development Kit (DPDK), in conjunction with the Cryptodev library.
42 The L2 Forwarding with Crypto sample application performs a crypto operation (cipher/hash)
43 specified by the user from command line (or using the default values),
44 with a crypto device capable of doing that operation,
45 for each packet that is received on a RX_PORT and performs L2 forwarding.
46 The destination port is the adjacent port from the enabled portmask, that is,
47 if the first four ports are enabled (portmask 0xf),
48 ports 0 and 1 forward into each other, and ports 2 and 3 forward into each other.
49 Also, the MAC addresses are affected as follows:
51 * The source MAC address is replaced by the TX_PORT MAC address
53 * The destination MAC address is replaced by 02:00:00:00:00:TX_PORT_ID
55 Compiling the Application
56 -------------------------
58 #. Go to the example directory:
60 .. code-block:: console
62 export RTE_SDK=/path/to/rte_sdk
63 cd ${RTE_SDK}/examples/l2fwd-crypto
65 #. Set the target (a default target is used if not specified). For example:
67 .. code-block:: console
69 export RTE_TARGET=x86_64-native-linuxapp-gcc
71 *See the DPDK Getting Started Guide* for possible RTE_TARGET values.
73 #. Build the application:
75 .. code-block:: console
79 Running the Application
80 -----------------------
82 The application requires a number of command line options:
84 .. code-block:: console
86 ./build/l2fwd-crypto [EAL options] -- [-p PORTMASK] [-q NQ] [-s] [-T PERIOD] /
87 [--cdev_type HW/SW/ANY] [--chain HASH_CIPHER/CIPHER_HASH/CIPHER_ONLY/HASH_ONLY] /
88 [--cipher_algo ALGO] [--cipher_op ENCRYPT/DECRYPT] [--cipher_key KEY] /
89 [--cipher_key_random_size SIZE] [--iv IV] [--iv_random_size SIZE] /
90 [--auth_algo ALGO] [--auth_op GENERATE/VERIFY] [--auth_key KEY] /
91 [--auth_key_random_size SIZE] [--aad AAD] [--aad_random_size SIZE] /
92 [--digest size SIZE] [--sessionless]
96 * p PORTMASK: A hexadecimal bitmask of the ports to configure (default is all the ports)
98 * q NQ: A number of queues (=ports) per lcore (default is 1)
100 * s: manage all ports from single core
102 * T PERIOD: statistics will be refreshed each PERIOD seconds
104 (0 to disable, 10 default, 86400 maximum)
106 * cdev_type: select preferred crypto device type: HW, SW or anything (ANY)
110 * chain: select the operation chaining to perform: Cipher->Hash (CIPHER_HASH),
112 Hash->Cipher (HASH_CIPHER), Cipher (CIPHER_ONLY), Hash(HASH_ONLY)
114 (default is Cipher->Hash)
116 * cipher_algo: select the ciphering algorithm (default is AES CBC)
118 * cipher_op: select the ciphering operation to perform: ENCRYPT or DECRYPT
122 * cipher_key: set the ciphering key to be used. Bytes has to be separated with ":"
124 * cipher_key_random_size: set the size of the ciphering key,
126 which will be generated randomly.
128 Note that if --cipher_key is used, this will be ignored.
130 * iv: set the IV to be used. Bytes has to be separated with ":"
132 * iv_random_size: set the size of the IV, which will be generated randomly.
134 Note that if --iv is used, this will be ignored.
136 * auth_algo: select the authentication algorithm (default is SHA1-HMAC)
138 * cipher_op: select the authentication operation to perform: GENERATE or VERIFY
140 (default is GENERATE)
142 * auth_key: set the authentication key to be used. Bytes has to be separated with ":"
144 * auth_key_random_size: set the size of the authentication key,
146 which will be generated randomly.
148 Note that if --auth_key is used, this will be ignored.
150 * aad: set the AAD to be used. Bytes has to be separated with ":"
152 * aad_random_size: set the size of the AAD, which will be generated randomly.
154 Note that if --aad is used, this will be ignored.
156 * digest_size: set the size of the digest to be generated/verified.
158 * sessionless: no crypto session will be created.
161 The application requires that crypto devices capable of performing
162 the specified crypto operation are available on application initialization.
163 This means that HW crypto device/s must be bound to a DPDK driver or
164 a SW crypto device/s (virtual crypto PMD) must be created (using --vdev).
166 To run the application in linuxapp environment with 2 lcores, 2 ports and 2 crypto devices, issue the command:
168 .. code-block:: console
170 $ ./build/l2fwd-crypto -l 0-1 -n 4 --vdev "cryptodev_aesni_mb_pmd" \
171 --vdev "cryptodev_aesni_mb_pmd" -- -p 0x3 --chain CIPHER_HASH \
172 --cipher_op ENCRYPT --cipher_algo AES_CBC \
173 --cipher_key 00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f \
174 --auth_op GENERATE --auth_algo AES_XCBC_MAC \
175 --auth_key 10:11:12:13:14:15:16:17:18:19:1a:1b:1c:1d:1e:1f
177 Refer to the *DPDK Getting Started Guide* for general information on running applications
178 and the Environment Abstraction Layer (EAL) options.
183 The L2 forward with Crypto application demonstrates the performance of a crypto operation
184 on a packet received on a RX PORT before forwarding it to a TX PORT.
186 The following figure illustrates a sample flow of a packet in the application,
187 from reception until transmission.
189 .. _figure_l2_fwd_encrypt_flow:
191 .. figure:: img/l2_fwd_encrypt_flow.*
193 Encryption flow Through the L2 Forwarding with Crypto Application
196 The following sections provide some explanation of the application.
198 Crypto operation specification
199 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
201 All the packets received in all the ports get transformed by the crypto device/s
202 (ciphering and/or authentication).
203 The crypto operation to be performed on the packet is parsed from the command line
204 (go to "Running the Application section for all the options).
206 If no parameter is passed, the default crypto operation is:
208 * Encryption with AES-CBC with 128 bit key.
210 * Authentication with SHA1-HMAC (generation).
212 * Keys, IV and AAD are generated randomly.
214 There are two methods to pass keys, IV and ADD from the command line:
216 * Passing the full key, separated bytes by ":"::
218 --cipher_key 00:11:22:33:44
220 * Passing the size, so key is generated randomly::
222 --cipher_key_random_size 16
225 If full key is passed (first method) and the size is passed as well (second method),
226 the latter will be ignored.
228 Size of these keys are checked (regardless the method), before starting the app,
229 to make sure that it is supported by the crypto devices.
231 Crypto device initialization
232 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
234 Once the encryption operation is defined, crypto devices are initialized.
235 The crypto devices must be either bound to a DPDK driver (if they are physical devices)
236 or created using the EAL option --vdev (if they are virtual devices),
237 when running the application.
239 The initialize_cryptodevs() function performs the device initialization.
240 It iterates through the list of the available crypto devices and
241 check which ones are capable of performing the operation.
242 Each device has a set of capabilities associated with it,
243 which are stored in the device info structure, so the function checks if the operation
244 is within the structure of each device.
246 The following code checks if the device supports the specified cipher algorithm
247 (similar for the authentication algorithm):
251 /* Check if device supports cipher algo */
253 opt_cipher_algo = options->cipher_xform.cipher.algo;
254 cap = &dev_info.capabilities[i];
255 while (cap->op != RTE_CRYPTO_OP_TYPE_UNDEFINED) {
256 cap_cipher_algo = cap->sym.cipher.algo;
257 if (cap->sym.xform_type ==
258 RTE_CRYPTO_SYM_XFORM_CIPHER) {
259 if (cap_cipher_algo == opt_cipher_algo) {
260 if (check_type(options, &dev_info) == 0)
264 cap = &dev_info.capabilities[++i];
267 If a capable crypto device is found, key sizes are checked to see if they are supported
268 (cipher key and IV for the ciphering):
273 * Check if length of provided cipher key is supported
274 * by the algorithm chosen.
276 if (options->ckey_param) {
277 if (check_supported_size(
278 options->cipher_xform.cipher.key.length,
279 cap->sym.cipher.key_size.min,
280 cap->sym.cipher.key_size.max,
281 cap->sym.cipher.key_size.increment)
283 printf("Unsupported cipher key length\n");
287 * Check if length of the cipher key to be randomly generated
288 * is supported by the algorithm chosen.
290 } else if (options->ckey_random_size != -1) {
291 if (check_supported_size(options->ckey_random_size,
292 cap->sym.cipher.key_size.min,
293 cap->sym.cipher.key_size.max,
294 cap->sym.cipher.key_size.increment)
296 printf("Unsupported cipher key length\n");
299 options->cipher_xform.cipher.key.length =
300 options->ckey_random_size;
301 /* No size provided, use minimum size. */
303 options->cipher_xform.cipher.key.length =
304 cap->sym.cipher.key_size.min;
306 After all the checks, the device is configured and it is added to the
310 The number of crypto devices that supports the specified crypto operation
311 must be at least the number of ports to be used.
316 The crypto operation has a crypto session associated to it, which contains
317 information such as the transform chain to perform (e.g. ciphering then hashing),
318 pointers to the keys, lengths... etc.
320 This session is created and is later attached to the crypto operation:
324 static struct rte_cryptodev_sym_session *
325 initialize_crypto_session(struct l2fwd_crypto_options *options,
328 struct rte_crypto_sym_xform *first_xform;
330 if (options->xform_chain == L2FWD_CRYPTO_CIPHER_HASH) {
331 first_xform = &options->cipher_xform;
332 first_xform->next = &options->auth_xform;
333 } else if (options->xform_chain == L2FWD_CRYPTO_HASH_CIPHER) {
334 first_xform = &options->auth_xform;
335 first_xform->next = &options->cipher_xform;
336 } else if (options->xform_chain == L2FWD_CRYPTO_CIPHER_ONLY) {
337 first_xform = &options->cipher_xform;
339 first_xform = &options->auth_xform;
342 /* Setup Cipher Parameters */
343 return rte_cryptodev_sym_session_create(cdev_id, first_xform);
348 port_cparams[i].session = initialize_crypto_session(options,
349 port_cparams[i].dev_id);
351 Crypto operation creation
352 ~~~~~~~~~~~~~~~~~~~~~~~~~
354 Given N packets received from a RX PORT, N crypto operations are allocated
361 * If we can't allocate a crypto_ops, then drop
362 * the rest of the burst and dequeue and
363 * process the packets to free offload structs
365 if (rte_crypto_op_bulk_alloc(
366 l2fwd_crypto_op_pool,
367 RTE_CRYPTO_OP_TYPE_SYMMETRIC,
370 for (j = 0; j < nb_rx; j++)
371 rte_pktmbuf_free(pkts_burst[i]);
376 After filling the crypto operation (including session attachment),
377 the mbuf which will be transformed is attached to it::
381 Since no destination mbuf is set, the source mbuf will be overwritten
382 after the operation is done (in-place).
384 Crypto operation enqueuing/dequeuing
385 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
387 Once the operation has been created, it has to be enqueued in one of the crypto devices.
388 Before doing so, for performance reasons, the operation stays in a buffer.
389 When the buffer has enough operations (MAX_PKT_BURST), they are enqueued in the device,
390 which will perform the operation at that moment:
395 l2fwd_crypto_enqueue(struct rte_crypto_op *op,
396 struct l2fwd_crypto_params *cparams)
398 unsigned lcore_id, len;
399 struct lcore_queue_conf *qconf;
401 lcore_id = rte_lcore_id();
403 qconf = &lcore_queue_conf[lcore_id];
404 len = qconf->op_buf[cparams->dev_id].len;
405 qconf->op_buf[cparams->dev_id].buffer[len] = op;
408 /* enough ops to be sent */
409 if (len == MAX_PKT_BURST) {
410 l2fwd_crypto_send_burst(qconf, MAX_PKT_BURST, cparams);
414 qconf->op_buf[cparams->dev_id].len = len;
421 l2fwd_crypto_send_burst(struct lcore_queue_conf *qconf, unsigned n,
422 struct l2fwd_crypto_params *cparams)
424 struct rte_crypto_op **op_buffer;
427 op_buffer = (struct rte_crypto_op **)
428 qconf->op_buf[cparams->dev_id].buffer;
430 ret = rte_cryptodev_enqueue_burst(cparams->dev_id,
431 cparams->qp_id, op_buffer, (uint16_t) n);
433 crypto_statistics[cparams->dev_id].enqueued += ret;
434 if (unlikely(ret < n)) {
435 crypto_statistics[cparams->dev_id].errors += (n - ret);
437 rte_pktmbuf_free(op_buffer[ret]->sym->m_src);
438 rte_crypto_op_free(op_buffer[ret]);
445 After this, the operations are dequeued from the device, and the transformed mbuf
446 is extracted from the operation. Then, the operation is freed and the mbuf is
447 forwarded as it is done in the L2 forwarding application.
451 /* Dequeue packets from Crypto device */
453 nb_rx = rte_cryptodev_dequeue_burst(
454 cparams->dev_id, cparams->qp_id,
455 ops_burst, MAX_PKT_BURST);
457 crypto_statistics[cparams->dev_id].dequeued +=
460 /* Forward crypto'd packets */
461 for (j = 0; j < nb_rx; j++) {
462 m = ops_burst[j]->sym->m_src;
464 rte_crypto_op_free(ops_burst[j]);
465 l2fwd_simple_forward(m, portid);
467 } while (nb_rx == MAX_PKT_BURST);