Commit cee2688e authored by yonatanc's avatar yonatanc Committed by Doug Ledford

IB/rxe: Offload CRC calculation when possible

Use CPU ability to perform CRC calculations, by
replacing direct calls to crc32_le() with crypto_shash_updata().

The overall performance gain measured with ib_send_bw tool is 10% and it
was tested on "Intel CPU ES-2660 v2 @ 2.20Ghz" CPU.

ib_send_bw -d rxe0  -x 1 -n 9000 -e  -s $((1024 * 1024 )) -l 100

---------------------------------------------------------------------------------------------
|             | bytes   | iterations | BW peak[MB/sec] | BW average[MB/sec] | MsgRate[Mpps] |
---------------------------------------------------------------------------------------------
| crc32_le    | 1048576 | 9000       | inf             | 497.60             | 0.000498      |
| CRC offload | 1048576 | 9000       | inf             | 546.70             | 0.000547      |
---------------------------------------------------------------------------------------------

Fixes: 8700e3e7 ("Soft RoCE driver")
Signed-off-by: default avatarYonatan Cohen <yonatanc@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 0d38ac8a
......@@ -2,6 +2,7 @@ config RDMA_RXE
tristate "Software RDMA over Ethernet (RoCE) driver"
depends on INET && PCI && INFINIBAND
depends on NET_UDP_TUNNEL
depends on CRYPTO_CRC32
select DMA_VIRT_OPS
---help---
This driver implements the InfiniBand RDMA transport over
......
......@@ -64,6 +64,8 @@ static void rxe_cleanup(struct rxe_dev *rxe)
rxe_pool_cleanup(&rxe->mc_elem_pool);
rxe_cleanup_ports(rxe);
crypto_free_shash(rxe->tfm);
}
/* called when all references have been dropped */
......
......@@ -50,6 +50,7 @@
#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"
......@@ -64,6 +65,25 @@
#define RXE_ROCE_V2_SPORT (0xc000)
static inline u32 rxe_crc32(struct rxe_dev *rxe,
u32 crc, void *next, size_t len)
{
int err;
SHASH_DESC_ON_STACK(shash, rxe->tfm);
shash->tfm = rxe->tfm;
shash->flags = 0;
*(u32 *)shash_desc_ctx(shash) = crc;
err = crypto_shash_update(shash, next, len);
if (unlikely(err)) {
pr_warn_ratelimited("failed crc calculation, err: %d\n", err);
return crc32_le(crc, next, len);
}
return *(u32 *)shash_desc_ctx(shash);
}
int rxe_set_mtu(struct rxe_dev *rxe, unsigned int dev_mtu);
int rxe_add(struct rxe_dev *rxe, unsigned int mtu);
......
......@@ -87,10 +87,10 @@ u32 rxe_icrc_hdr(struct rxe_pkt_info *pkt, struct sk_buff *skb)
bth->qpn |= cpu_to_be32(~BTH_QPN_MASK);
length = hdr_size + RXE_BTH_BYTES;
crc = crc32_le(crc, pshdr, length);
crc = rxe_crc32(pkt->rxe, crc, pshdr, length);
/* And finish to compute the CRC on the remainder of the headers. */
crc = crc32_le(crc, pkt->hdr + RXE_BTH_BYTES,
crc = rxe_crc32(pkt->rxe, crc, pkt->hdr + RXE_BTH_BYTES,
rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES);
return crc;
}
......@@ -370,7 +370,8 @@ int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
((void *)(uintptr_t)iova) : addr;
if (crcp)
*crcp = crc32_le(*crcp, src, length);
crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
*crcp, src, length);
memcpy(dest, src, length);
......@@ -403,7 +404,8 @@ int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
bytes = length;
if (crcp)
crc = crc32_le(crc, src, bytes);
crc = rxe_crc32(to_rdev(mem->pd->ibpd.device),
crc, src, bytes);
memcpy(dest, src, bytes);
......
......@@ -387,7 +387,7 @@ int rxe_rcv(struct sk_buff *skb)
pack_icrc = be32_to_cpu(*icrcp);
calc_icrc = rxe_icrc_hdr(pkt, skb);
calc_icrc = crc32_le(calc_icrc, (u8 *)payload_addr(pkt),
calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
payload_size(pkt));
calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
if (unlikely(calc_icrc != pack_icrc)) {
......
......@@ -32,6 +32,7 @@
*/
#include <linux/skbuff.h>
#include <crypto/hash.h>
#include "rxe.h"
#include "rxe_loc.h"
......@@ -483,8 +484,7 @@ static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
if (wqe->wr.send_flags & IB_SEND_INLINE) {
u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
crc = crc32_le(crc, tmp, paylen);
crc = rxe_crc32(rxe, crc, tmp, paylen);
memcpy(payload_addr(pkt), tmp, paylen);
wqe->dma.resid -= paylen;
......
......@@ -1322,6 +1322,13 @@ int rxe_register_device(struct rxe_dev *rxe)
dev->get_hw_stats = rxe_ib_get_hw_stats;
dev->alloc_hw_stats = rxe_ib_alloc_hw_stats;
rxe->tfm = crypto_alloc_shash("crc32", 0, 0);
if (IS_ERR(rxe->tfm)) {
pr_err("failed to allocate crc algorithmi err:%ld",
PTR_ERR(rxe->tfm));
return PTR_ERR(rxe->tfm);
}
err = ib_register_device(dev, NULL);
if (err) {
pr_warn("rxe_register_device failed, err = %d\n", err);
......@@ -1342,6 +1349,8 @@ int rxe_register_device(struct rxe_dev *rxe)
err2:
ib_unregister_device(dev);
err1:
crypto_free_shash(rxe->tfm);
return err;
}
......
......@@ -406,6 +406,7 @@ struct rxe_dev {
struct rxe_port port;
struct list_head list;
struct crypto_shash *tfm;
};
static inline void rxe_counter_inc(struct rxe_dev *rxe, enum rxe_counters cnt)
......
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