dpdk/rss: add rte_flow_rss support for mlx5

mlx5 driver uses only one generic rte_flow RSS rule to match all traffic

The configuration of this rule is the same as for ixgbe driver except
the hash function is not RTE_ETH_HASH_FUNCTION_DEFAULT but
RTE_ETH_HASH_FUNCTION_TOEPLITZ.

The syntax in dpdk-testpmd for this rule with attributes:
	port index == 0
	used rx queue indices == 0 1 2 3
	<hash_key> == 6d5a symmetric hash key
is as follows:
"flow create 0 ingress pattern eth / end actions rss types ipv4 ipv6
end queues 0 1 2 3 end key <hash_key> key_len 40 func toeplitz / end"

Ticket: 7337

src/Makefile.am

@@ -479,6 +479,7 @@ noinst_HEADERS = \
 	util-dpdk-i40e.h \
 	util-dpdk-ice.h \
 	util-dpdk-ixgbe.h \
+	util-dpdk-mlx5.h \
 	util-dpdk-bonding.h \
 	util-dpdk-rss.h \
 	util-ebpf.h \
@@ -1028,6 +1029,7 @@ libsuricata_c_a_SOURCES = \
 	util-dpdk-i40e.c \
 	util-dpdk-ice.c \
 	util-dpdk-ixgbe.c \
+	util-dpdk-mlx5.c \
 	util-dpdk-bonding.c \
 	util-dpdk-rss.c \
 	util-ebpf.c \

src/source-dpdk.c

@@ -90,6 +90,7 @@ TmEcode NoDPDKSupportExit(ThreadVars *tv, const void *initdata, void **data)
 #include "util-dpdk-i40e.h"
 #include "util-dpdk-ice.h"
 #include "util-dpdk-ixgbe.h"
+#include "util-dpdk-mlx5.h"
 #include "util-dpdk-bonding.h"
 #include <numa.h>
 
@@ -200,6 +201,8 @@ static void DevicePostStartPMDSpecificActions(DPDKThreadVars *ptv, const char *d
         ixgbeDeviceSetRSS(ptv->port_id, ptv->threads, ptv->livedev->dev);
     else if (strcmp(driver_name, "net_ice") == 0)
         iceDeviceSetRSS(ptv->port_id, ptv->threads, ptv->livedev->dev);
+    else if (strcmp(driver_name, "mlx5_pci") == 0)
+        mlx5DeviceSetRSS(ptv->port_id, ptv->threads, ptv->livedev->dev);
 }
 
 static void DevicePreClosePMDSpecificActions(DPDKThreadVars *ptv, const char *driver_name)
@@ -209,7 +212,7 @@ static void DevicePreClosePMDSpecificActions(DPDKThreadVars *ptv, const char *dr
     }
 
     if (strcmp(driver_name, "net_i40e") == 0 || strcmp(driver_name, "net_ixgbe") == 0 ||
-            strcmp(driver_name, "net_ice") == 0) {
+            strcmp(driver_name, "net_ice") == 0 || strcmp(driver_name, "mlx5_pci") == 0) {
 #if RTE_VERSION > RTE_VERSION_NUM(20, 0, 0, 0)
         // Flush the RSS rules that have been inserted in the post start section
         struct rte_flow_error flush_error = { 0 };

src/util-dpdk-mlx5.c

@@ -0,0 +1,76 @@
+/* Copyright (C) 2024 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ *  \defgroup dpdk DPDK NVIDIA mlx5 driver helpers functions
+ *
+ *  @{
+ */
+
+/**
+ * \file
+ *
+ * \author Adam Kiripolsky <adam.kiripolsky@cesnet.cz>
+ *
+ * DPDK driver's helper functions
+ *
+ */
+
+#include "util-debug.h"
+#include "util-dpdk.h"
+#include "util-dpdk-bonding.h"
+#include "util-dpdk-mlx5.h"
+#include "util-dpdk-rss.h"
+
+#ifdef HAVE_DPDK
+
+#define MLX5_RSS_HKEY_LEN 40
+
+int mlx5DeviceSetRSS(int port_id, int nb_rx_queues, char *port_name)
+{
+    uint16_t queues[RTE_MAX_QUEUES_PER_PORT];
+    struct rte_flow_error flush_error = { 0 };
+    struct rte_eth_rss_conf rss_conf = {
+        .rss_key = RSS_HKEY,
+        .rss_key_len = MLX5_RSS_HKEY_LEN,
+    };
+
+    if (nb_rx_queues < 1) {
+        FatalError("The number of queues for RSS configuration must be "
+                   "configured with a positive number");
+    }
+
+    struct rte_flow_action_rss rss_action_conf = DeviceInitRSSAction(
+            rss_conf, nb_rx_queues, queues, RTE_ETH_HASH_FUNCTION_TOEPLITZ, true);
+
+    int retval = DeviceCreateRSSFlowGeneric(port_id, port_name, rss_action_conf);
+    if (retval != 0) {
+        retval = rte_flow_flush(port_id, &flush_error);
+        if (retval != 0) {
+            SCLogError("Unable to flush rte_flow rules of %s: %s Flush error msg: %s", port_name,
+                    rte_strerror(-retval), flush_error.message);
+        }
+        return retval;
+    }
+
+    return 0;
+}
+
+#endif /* HAVE_DPDK */
+/**
+ * @}
+ */

src/util-dpdk-mlx5.h

@@ -0,0 +1,35 @@
+/* Copyright (C) 2024 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ *
+ * \author Adam Kiripolsky <adam.kiripolsky@cesnet.cz>
+ */
+
+#ifndef UTIL_DPDK_MLX5_H
+#define UTIL_DPDK_MLX5_H
+
+#include "suricata-common.h"
+
+#ifdef HAVE_DPDK
+
+int mlx5DeviceSetRSS(int port_id, int nb_rx_queues, char *port_name);
+
+#endif /* HAVE_DPDK */
+
+#endif /* UTIL_DPDK_MLX5_H */

src/util-dpdk-rss.c

@@ -108,7 +108,8 @@ int DeviceCreateRSSFlowGeneric(
     action[0].conf = &rss_conf;
     action[1].type = RTE_FLOW_ACTION_TYPE_END;
 
-    pattern[0].type = RTE_FLOW_ITEM_TYPE_END;
+    pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
+    pattern[1].type = RTE_FLOW_ITEM_TYPE_END;
 
     struct rte_flow *flow = rte_flow_create(port_id, &attr, pattern, action, &flow_error);
     if (flow == NULL) {