e1000: use newly exposed RSS hash key API rather than ad-hoc hashing

Differential Revision:	https://reviews.freebsd.org/D53097
Reviewed by: kbowling
Sponsored by: Netflix

sys/dev/e1000/em_txrx.c

@@ -29,10 +29,8 @@
 
 #include "if_em.h"
 
-#ifdef RSS
 #include <net/rss_config.h>
 #include <netinet/in_rss.h>
-#endif
 
 #ifdef VERBOSE_DEBUG
 #define DPRINTF device_printf

sys/dev/e1000/if_em.c

@@ -3415,12 +3415,8 @@ igb_initialize_rss_mapping(struct e1000_softc *sc)
 	 */
 	mrqc = E1000_MRQC_ENABLE_RSS_MQ;
 
-#ifdef RSS
 	/* XXX ew typecasting */
 	rss_getkey((uint8_t *) &rss_key);
-#else
-	arc4rand(&rss_key, sizeof(rss_key), 0);
-#endif
 	for (i = 0; i < 10; i++)
 		E1000_WRITE_REG_ARRAY(hw, E1000_RSSRK(0), i, rss_key[i]);
 

sys/dev/e1000/if_em.h

@@ -72,10 +72,8 @@
 #include <net/if_dl.h>
 #include <net/if_media.h>
 #include <net/iflib.h>
-#ifdef	RSS
 #include <net/rss_config.h>
 #include <netinet/in_rss.h>
-#endif
 
 #include <net/if_types.h>
 #include <net/if_vlan_var.h>

sys/dev/e1000/igb_txrx.c

@@ -28,10 +28,8 @@
 
 #include "if_em.h"
 
-#ifdef RSS
 #include <net/rss_config.h>
 #include <netinet/in_rss.h>
-#endif
 
 #ifdef VERBOSE_DEBUG
 #define DPRINTF device_printf