[RFC PATCH 0/4] crypto: add CRYPTO_TFM_REQ_DMA flag

[Iuliana Prodan (OSS)]

From: Iuliana Prodan <iuliana.prodan@xxxxxxx>

Add the option to allocate the crypto request object plus any extra space
needed by the driver into a DMA-able memory.

Add CRYPTO_TFM_REQ_DMA flag to be used by backend implementations to
indicate to crypto API the need to allocate GFP_DMA memory
for private contexts of the crypto requests.

For IPsec use cases, CRYPTO_TFM_REQ_DMA flag is also checked in
esp_alloc_tmp() function for IPv4 and IPv6.

This series includes an example of how a driver can use
CRYPTO_TFM_REQ_DMA flag while setting reqsize to a larger value
to avoid allocating memory at crypto request runtime.
The extra size needed by the driver is added to the reqsize field
that indicates how much memory could be needed per request.

Iuliana Prodan (4):
  crypto: add CRYPTO_TFM_REQ_DMA flag
  net: esp: check CRYPTO_TFM_REQ_DMA flag when allocating crypto request
  crypto: caam - avoid allocating memory at crypto request runtime for
    skcipher
  crypto: caam - avoid allocating memory at crypto request runtime for
    aead

 drivers/crypto/caam/caamalg.c | 130 +++++++++++++++++++++++++---------
 include/crypto/aead.h         |   4 ++
 include/crypto/akcipher.h     |  21 ++++++
 include/crypto/hash.h         |   4 ++
 include/crypto/skcipher.h     |   4 ++
 include/linux/crypto.h        |   1 +
 net/ipv4/esp4.c               |   7 +-
 net/ipv6/esp6.c               |   7 +-
 8 files changed, 144 insertions(+), 34 deletions(-)

-- 
2.17.1