RDMA/siw: Use crypto_shash_digest() in siw_qp_prepare_tx()

Simplify siw_qp_prepare_tx() by using crypto_shash_digest() instead of
an init+update+final sequence.  This should also improve performance.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20231029045839.154071-1-ebiggers@kernel.orgAcked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/sw/siw/siw_qp_tx.c

@@ -249,14 +249,10 @@ static int siw_qp_prepare_tx(struct siw_iwarp_tx *c_tx)
 		/*
 		 * Do complete CRC if enabled and short packet
 		 */
-		if (c_tx->mpa_crc_hd) {
-			crypto_shash_init(c_tx->mpa_crc_hd);
-			if (crypto_shash_update(c_tx->mpa_crc_hd,
-						(u8 *)&c_tx->pkt,
-						c_tx->ctrl_len))
-				return -EINVAL;
-			crypto_shash_final(c_tx->mpa_crc_hd, (u8 *)crc);
-		}
+		if (c_tx->mpa_crc_hd &&
+		    crypto_shash_digest(c_tx->mpa_crc_hd, (u8 *)&c_tx->pkt,
+					c_tx->ctrl_len, (u8 *)crc) != 0)
+			return -EINVAL;
 		c_tx->ctrl_len += MPA_CRC_SIZE;
 
 		return PKT_COMPLETE;