RDMA/rxe: switch to using the crc32 library

Now that the crc32_le() library function takes advantage of
architecture-specific optimizations, it is unnecessary to go through the
crypto API.  Just use crc32_le().  This is much simpler, and it improves
performance due to eliminating the crypto API overhead.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://patch.msgid.link/20250207032316.53941-1-ebiggers@kernel.org
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/sw/rxe/Kconfig

@@ -4,8 +4,7 @@ config RDMA_RXE
 	depends on INET && PCI && INFINIBAND
 	depends on INFINIBAND_VIRT_DMA
 	select NET_UDP_TUNNEL
-	select CRYPTO
+	select CRC32
-	select CRYPTO_CRC32
 	help
 	This driver implements the InfiniBand RDMA transport over
 	the Linux network stack. It enables a system with a

drivers/infiniband/sw/rxe/rxe.c

@@ -31,9 +31,6 @@ void rxe_dealloc(struct ib_device *ib_dev)
 
 	WARN_ON(!RB_EMPTY_ROOT(&rxe->mcg_tree));
 
-	if (rxe->tfm)
-		crypto_free_shash(rxe->tfm);
-
 	mutex_destroy(&rxe->usdev_lock);
 }
 

drivers/infiniband/sw/rxe/rxe.h

@@ -21,7 +21,6 @@
 #include <rdma/ib_umem.h>
 #include <rdma/ib_cache.h>
 #include <rdma/ib_addr.h>
-#include <crypto/hash.h>
 
 #include "rxe_net.h"
 #include "rxe_opcode.h"

drivers/infiniband/sw/rxe/rxe_icrc.c

@@ -9,28 +9,6 @@
 #include "rxe.h"
 #include "rxe_loc.h"
 
-/**
- * rxe_icrc_init() - Initialize crypto function for computing crc32
- * @rxe: rdma_rxe device object
- *
- * Return: 0 on success else an error
- */
-int rxe_icrc_init(struct rxe_dev *rxe)
-{
-	struct crypto_shash *tfm;
-
-	tfm = crypto_alloc_shash("crc32", 0, 0);
-	if (IS_ERR(tfm)) {
-		rxe_dbg_dev(rxe, "failed to init crc32 algorithm err: %ld\n",
-			       PTR_ERR(tfm));
-		return PTR_ERR(tfm);
-	}
-
-	rxe->tfm = tfm;
-
-	return 0;
-}
-
 /**
  * rxe_crc32() - Compute cumulative crc32 for a contiguous segment
  * @rxe: rdma_rxe device object
@@ -42,23 +20,7 @@ int rxe_icrc_init(struct rxe_dev *rxe)
  */
 static __be32 rxe_crc32(struct rxe_dev *rxe, __be32 crc, void *next, size_t len)
 {
-	__be32 icrc;
+	return (__force __be32)crc32_le((__force u32)crc, next, len);
-	int err;
-
-	SHASH_DESC_ON_STACK(shash, rxe->tfm);
-
-	shash->tfm = rxe->tfm;
-	*(__be32 *)shash_desc_ctx(shash) = crc;
-	err = crypto_shash_update(shash, next, len);
-	if (unlikely(err)) {
-		rxe_dbg_dev(rxe, "failed crc calculation, err: %d\n", err);
-		return (__force __be32)crc32_le((__force u32)crc, next, len);
-	}
-
-	icrc = *(__be32 *)shash_desc_ctx(shash);
-	barrier_data(shash_desc_ctx(shash));
-
-	return icrc;
 }
 
 /**

drivers/infiniband/sw/rxe/rxe_loc.h

@@ -168,7 +168,6 @@ int rxe_sender(struct rxe_qp *qp);
 int rxe_receiver(struct rxe_qp *qp);
 
 /* rxe_icrc.c */
-int rxe_icrc_init(struct rxe_dev *rxe);
 int rxe_icrc_check(struct sk_buff *skb, struct rxe_pkt_info *pkt);
 void rxe_icrc_generate(struct sk_buff *skb, struct rxe_pkt_info *pkt);
 

drivers/infiniband/sw/rxe/rxe_req.c

@@ -5,7 +5,6 @@
  */
 
 #include <linux/skbuff.h>
-#include <crypto/hash.h>
 
 #include "rxe.h"
 #include "rxe_loc.h"

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -1546,10 +1546,6 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name,
 	if (err)
 		return err;
 
-	err = rxe_icrc_init(rxe);
-	if (err)
-		return err;
-
 	err = ib_register_device(dev, ibdev_name, NULL);
 	if (err)
 		rxe_dbg_dev(rxe, "failed with error %d\n", err);

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -404,7 +404,6 @@ struct rxe_dev {
 	atomic64_t		stats_counters[RXE_NUM_OF_COUNTERS];
 
 	struct rxe_port		port;
-	struct crypto_shash	*tfm;
 };
 
 static inline struct net_device *rxe_ib_device_get_netdev(struct ib_device *dev)