Add rss_scheme parameter to select rss hash

Author: cardigliano

drivers/intel/ice/ice-1.12.7-zc/src/ice_lib.c

@@ -12,6 +12,7 @@
 
 #ifdef HAVE_PF_RING
 extern int RSS[ICE_MAX_NIC];
+extern int rss_scheme;
 extern int enable_debug;
 #endif
 
@@ -2318,7 +2319,12 @@ int ice_vsi_cfg_rss_lut_key(struct ice_vsi *vsi)
 	 * 11b = Reserved
 	*/
 	reg = rd32(hw, VSIQF_HASH_CTL(vsi->vsi_num));
-	reg = (reg & (~VSIQF_HASH_CTL_HASH_SCHEME_M)) | (1 << VSIQF_HASH_CTL_HASH_SCHEME_S);
+	if (rss_scheme == 1) /* Asymmetric Toeplitz */
+		reg = (reg & (~VSIQF_HASH_CTL_HASH_SCHEME_M)) | (0);
+	else if (rss_scheme == 2) /* Simple XOR */
+		reg = (reg & (~VSIQF_HASH_CTL_HASH_SCHEME_M)) | (2 << VSIQF_HASH_CTL_HASH_SCHEME_S);
+	else /* Symmetric Toeplitz (Default) */
+		reg = (reg & (~VSIQF_HASH_CTL_HASH_SCHEME_M)) | (1 << VSIQF_HASH_CTL_HASH_SCHEME_S);
 	wr32(hw, VSIQF_HASH_CTL(vsi->vsi_num), reg); 
 #endif
 

drivers/intel/ice/ice-1.12.7-zc/src/ice_main.c

@@ -38,11 +38,15 @@ MODULE_PARM_DESC(RSS,
 
 int enable_debug = 0;
 module_param(enable_debug, int, 0644);
-MODULE_PARM_DESC(debug, "PF_RING debug (0=none, 1=enabled)");
+MODULE_PARM_DESC(enable_debug, "PF_RING debug (0=none, 1=enabled)");
+
+int rss_scheme = 0;
+module_param(rss_scheme, int, 0644);
+MODULE_PARM_DESC(rss_scheme, "Select RSS Hash Scheme (0=Symmetric Toeplitz, 1=Asymmetric Toeplitz, 2=Simple XOR)");
 
 int pppoe_rss = 0;
 module_param(pppoe_rss, int, 0644);
-MODULE_PARM_DESC(debug, "Enable PPPoE Session ID hash in RSS (0=disabled, 1=enabled)");
+MODULE_PARM_DESC(pppoe_rss, "Enable PPPoE Session ID hash in RSS (0=disabled, 1=enabled)");
 #endif /* HAVE_PF_RING */
 
 #define DRV_VERSION_MAJOR 1