doc: fix AESNI-GCM limitations in crypto guide

This patch fixes the aesni-gcm cryptodev documentation by
filling the lacked unsupported chained mbuf description.

Fixes: 6f16aab09a91 ("crypto/aesni_gcm: migrate to Multi-buffer library")
Cc: stable@dpdk.org
Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>

diff --git a/doc/guides/cryptodevs/aesni_gcm.rst b/doc/guides/cryptodevs/aesni_gcm.rst
index 9a8bc93..15002ab 100644 (file)
--- a/doc/guides/cryptodevs/aesni_gcm.rst
+++ b/doc/guides/cryptodevs/aesni_gcm.rst
@@ -22,11 +22,12 @@ AEAD algorithms:
 
 * RTE_CRYPTO_AEAD_AES_GCM
 
-
 Limitations
 -----------
 
 * Chained mbufs are supported but only out-of-place (destination mbuf must be contiguous).
+* Chained mbufs are only supported by RTE_CRYPTO_AEAD_AES_GCM algorithm,
+  not RTE_CRYPTO_AUTH_AES_GMAC.
 * Cipher only is not supported.