netdev - [PATCH net-next 4/5] selftests: hw-net: toeplitz: read indirection table from the device

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Message-ID: <20251121040259.3647749-5-kuba@kernel.org>
Date: Thu, 20 Nov 2025 20:02:58 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	andrew+netdev@...n.ch,
	horms@...nel.org,
	willemb@...gle.com,
	petrm@...dia.com,
	dw@...idwei.uk,
	shuah@...nel.org,
	linux-kselftest@...r.kernel.org,
	Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next 4/5] selftests: hw-net: toeplitz: read indirection table from the device

Replace the simple modulo math with the real indirection table
read from the device. This makes the tests pass for mlx5 and
bnxt NICs.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 .../selftests/drivers/net/hw/toeplitz.c       | 24 ++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/drivers/net/hw/toeplitz.c b/tools/testing/selftests/drivers/net/hw/toeplitz.c
index 7420a4e201cc..a4d04438c313 100644
--- a/tools/testing/selftests/drivers/net/hw/toeplitz.c
+++ b/tools/testing/selftests/drivers/net/hw/toeplitz.c
@@ -68,6 +68,7 @@
 #define FOUR_TUPLE_MAX_LEN	((sizeof(struct in6_addr) * 2) + (sizeof(uint16_t) * 2))
 
 #define RSS_MAX_CPUS (1 << 16)	/* real constraint is PACKET_FANOUT_MAX */
+#define RSS_MAX_INDIR	(1 << 16)
 
 #define RPS_MAX_CPUS 16UL	/* must be a power of 2 */
 
@@ -105,6 +106,8 @@ struct ring_state {
 static unsigned int rx_irq_cpus[RSS_MAX_CPUS];	/* map from rxq to cpu */
 static int rps_silo_to_cpu[RPS_MAX_CPUS];
 static unsigned char toeplitz_key[TOEPLITZ_KEY_MAX_LEN];
+static unsigned int rss_indir_tbl[RSS_MAX_INDIR];
+static unsigned int rss_indir_tbl_size;
 static struct ring_state rings[RSS_MAX_CPUS];
 
 static inline uint32_t toeplitz(const unsigned char *four_tuple,
@@ -133,7 +136,12 @@ static inline uint32_t toeplitz(const unsigned char *four_tuple,
 /* Compare computed cpu with arrival cpu from packet_fanout_cpu */
 static void verify_rss(uint32_t rx_hash, int cpu)
 {
-	int queue = rx_hash % cfg_num_queues;
+	int queue;
+
+	if (rss_indir_tbl_size)
+		queue = rss_indir_tbl[rx_hash % rss_indir_tbl_size];
+	else
+		queue = rx_hash % cfg_num_queues;
 
 	log_verbose(" rxq %d (cpu %d)", queue, rx_irq_cpus[queue]);
 	if (rx_irq_cpus[queue] != cpu) {
@@ -517,6 +525,20 @@ static void read_rss_dev_info_ynl(void)
 
 	memcpy(toeplitz_key, rsp->hkey, rsp->_len.hkey);
 
+	if (rsp->_count.indir > RSS_MAX_INDIR)
+		error(1, 0, "RSS indirection table too large (%u > %u)",
+		      rsp->_count.indir, RSS_MAX_INDIR);
+
+	/* If indir table not available we'll fallback to simple modulo math */
+	if (rsp->_count.indir) {
+		memcpy(rss_indir_tbl, rsp->indir,
+		       rsp->_count.indir * sizeof(rss_indir_tbl[0]));
+		rss_indir_tbl_size = rsp->_count.indir;
+
+		log_verbose("RSS indirection table size: %u\n",
+			    rss_indir_tbl_size);
+	}
+
 	ethtool_rss_get_rsp_free(rsp);
 	ethtool_rss_get_req_free(req);
 	ynl_sock_destroy(ys);
-- 
2.51.1