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Mon, 15 Nov 2021 10:24:16 -0800 (PST)
From: Lance Richardson <lance.richardson@broadcom.com>
To: Bruce Richardson <bruce.richardson@intel.com>,
Konstantin Ananyev <konstantin.ananyev@intel.com>,
Ajit Khaparde <ajit.khaparde@broadcom.com>,
Somnath Kotur <somnath.kotur@broadcom.com>
Cc: dev@dpdk.org,
stable@dpdk.org
Subject: [PATCH 1/2] net/bnxt: avoid unnecessary work in AVX2 Rx path
Date: Mon, 15 Nov 2021 13:24:09 -0500
Message-Id: <20211115182410.5545-2-lance.richardson@broadcom.com>
X-Mailer: git-send-email 2.25.1
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--000000000000ac90f305d0d7ea86
Content-Transfer-Encoding: 8bit
Each call to the AVX2 vector burst receive function makes at
least one pass through the function's inner loop, loading
256 bytes of completion descriptors and copying 8 rte_mbuf
pointers regardless of whether there are any packets to be
received.
Unidirectional forwarding performance is improved by about
3-4% if we ensure that at least one packet can be received
before entering the inner loop.
Fixes: c4e4c18963b0 ("net/bnxt: add AVX2 RX/Tx")
Cc: stable@dpdk.org
Signed-off-by: Lance Richardson <lance.richardson@broadcom.com>
---
drivers/net/bnxt/bnxt_rxtx_vec_avx2.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c b/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c
index e4905b4fd1..54e3af22ac 100644
--- a/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c
+++ b/drivers/net/bnxt/bnxt_rxtx_vec_avx2.c
@@ -98,6 +98,10 @@ recv_burst_vec_avx2(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
rte_prefetch0(&cp_desc_ring[cons + 8]);
rte_prefetch0(&cp_desc_ring[cons + 12]);
+ /* Return immediately if there is not at least one completed packet. */
+ if (!bnxt_cpr_cmp_valid(&cp_desc_ring[cons], raw_cons, cp_ring_size))
+ return 0;
+
/* Ensure that we do not go past the ends of the rings. */
nb_pkts = RTE_MIN(nb_pkts, RTE_MIN(rx_ring_size - mbcons,
(cp_ring_size - cons) / 2));
--
2.25.1
--000000000000ac90f305d0d7ea86
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