patch 'net/iavf: fix AVX-512 pointer copy on 32-bit' has been queued to stable release 21.11.9

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 21.11.9

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 12/02/24. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/4d613e1278426faa2bac791b0ef756daf37f231d

Thanks.

Kevin

---
>From 4d613e1278426faa2bac791b0ef756daf37f231d Mon Sep 17 00:00:00 2001
From: Bruce Richardson <bruce.richardson at intel.com>
Date: Fri, 6 Sep 2024 15:11:26 +0100
Subject: [PATCH] net/iavf: fix AVX-512 pointer copy on 32-bit

[ upstream commit 77608b24bdd840d323ebd9cb6ffffaf5c760983e ]

The size of a pointer on 32-bit is only 4 rather than 8 bytes, so
copying 32 pointers only requires half the number of AVX-512 load store
operations.

Fixes: 9ab9514c150e ("net/iavf: enable AVX512 for Tx")

Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
Acked-by: Ian Stokes <ian.stokes at intel.com>
---
 drivers/net/iavf/iavf_rxtx_vec_avx512.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx512.c b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
index 9876c715e5..874ae55676 100644
--- a/drivers/net/iavf/iavf_rxtx_vec_avx512.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
@@ -1819,4 +1819,5 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
 		/* n is multiple of 32 */
 		while (copied < n) {
+#ifdef RTE_ARCH_64
 			const __m512i a = _mm512_loadu_si512(&txep[copied]);
 			const __m512i b = _mm512_loadu_si512(&txep[copied + 8]);
@@ -1828,4 +1829,10 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
 			_mm512_storeu_si512(&cache_objs[copied + 16], c);
 			_mm512_storeu_si512(&cache_objs[copied + 24], d);
+#else
+			const __m512i a = _mm512_loadu_si512(&txep[copied]);
+			const __m512i b = _mm512_loadu_si512(&txep[copied + 16]);
+			_mm512_storeu_si512(&cache_objs[copied], a);
+			_mm512_storeu_si512(&cache_objs[copied + 16], b);
+#endif
 			copied += 32;
 		}
-- 
2.47.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-11-27 17:17:39.578254385 +0000
+++ 0041-net-iavf-fix-AVX-512-pointer-copy-on-32-bit.patch	2024-11-27 17:17:38.207269280 +0000
@@ -1 +1 @@
-From 77608b24bdd840d323ebd9cb6ffffaf5c760983e Mon Sep 17 00:00:00 2001
+From 4d613e1278426faa2bac791b0ef756daf37f231d Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 77608b24bdd840d323ebd9cb6ffffaf5c760983e ]
+
@@ -11 +12,0 @@
-Cc: stable at dpdk.org
@@ -20 +21 @@
-index 3bb6f305df..d6a861bf80 100644
+index 9876c715e5..874ae55676 100644
@@ -23 +24 @@
-@@ -1893,4 +1893,5 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
+@@ -1819,4 +1819,5 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
@@ -29 +30 @@
-@@ -1902,4 +1903,10 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
+@@ -1828,4 +1829,10 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)