From bad52b1658ae0cf3d64b4e3265ad588c8e3e5f2c Mon Sep 17 00:00:00 2001
From: Stephen Hurd <shurd@FreeBSD.org>
Date: Tue, 28 Feb 2017 02:27:51 +0000
Subject: [PATCH] bnxt: propagate RSS hash type to the network stack.

RSS hash type will be used to identify the CPU on to which, a receive packet
will be queued.  This patch extracts the "RSS hash type" from the receive
completion and sends it to the stack.

Submitted by:	Venkatkumar Duvvuru <venkatkumar.duvvuru@broadcom.com>
Reviewed by:	shurd
Approved by:	sbruno
MFC after:	1 week
Sponsored by:	Broadcom Limited
Differential Revision:	https://reviews.freebsd.org/D9685
---
 sys/dev/bnxt/bnxt.h      |  8 +++++++
 sys/dev/bnxt/bnxt_txrx.c | 47 ++++++++++++++++++++++++++++------------
 2 files changed, 41 insertions(+), 14 deletions(-)

diff --git a/sys/dev/bnxt/bnxt.h b/sys/dev/bnxt/bnxt.h
index 608c1b89d2a..13d5c1a9b1d 100644
--- a/sys/dev/bnxt/bnxt.h
+++ b/sys/dev/bnxt/bnxt.h
@@ -92,6 +92,14 @@ __FBSDID("$FreeBSD$");
 
 #define BNXT_MAX_MTU	9000
 
+#define BNXT_RSS_HASH_TYPE_TCPV4	0
+#define BNXT_RSS_HASH_TYPE_UDPV4	1
+#define BNXT_RSS_HASH_TYPE_IPV4		2
+#define BNXT_RSS_HASH_TYPE_TCPV6	3
+#define BNXT_RSS_HASH_TYPE_UDPV6	4
+#define BNXT_RSS_HASH_TYPE_IPV6		5
+#define BNXT_GET_RSS_PROFILE_ID(rss_hash_type) ((rss_hash_type >> 1) & 0x1F)
+
 /* Completion related defines */
 #define CMP_VALID(cmp, v_bit) \
 	((!!(((struct cmpl_base *)(cmp))->info3_v & htole32(CMPL_BASE_V))) == !!(v_bit) )
diff --git a/sys/dev/bnxt/bnxt_txrx.c b/sys/dev/bnxt/bnxt_txrx.c
index b3e8a12b71b..1729ba3a93e 100644
--- a/sys/dev/bnxt/bnxt_txrx.c
+++ b/sys/dev/bnxt/bnxt_txrx.c
@@ -412,6 +412,37 @@ cmpl_invalid:
 	return avail;
 }
 
+static void
+bnxt_set_rsstype(if_rxd_info_t ri, uint8_t rss_hash_type)
+{
+	uint8_t rss_profile_id;
+
+	rss_profile_id = BNXT_GET_RSS_PROFILE_ID(rss_hash_type);
+	switch (rss_profile_id) {
+	case BNXT_RSS_HASH_TYPE_TCPV4:
+		ri->iri_rsstype = M_HASHTYPE_RSS_TCP_IPV4;
+		break;
+	case BNXT_RSS_HASH_TYPE_UDPV4:
+		ri->iri_rsstype = M_HASHTYPE_RSS_UDP_IPV4;
+		break;
+	case BNXT_RSS_HASH_TYPE_IPV4:
+		ri->iri_rsstype = M_HASHTYPE_RSS_IPV4;
+		break;
+	case BNXT_RSS_HASH_TYPE_TCPV6:
+		ri->iri_rsstype = M_HASHTYPE_RSS_TCP_IPV6;
+		break;
+	case BNXT_RSS_HASH_TYPE_UDPV6:
+		ri->iri_rsstype = M_HASHTYPE_RSS_UDP_IPV6;
+		break;
+	case BNXT_RSS_HASH_TYPE_IPV6:
+		ri->iri_rsstype = M_HASHTYPE_RSS_IPV6;
+		break;
+	default:
+		ri->iri_rsstype = M_HASHTYPE_OPAQUE;
+		break;
+	}
+}
+
 static int
 bnxt_pkt_get_l2(struct bnxt_softc *softc, if_rxd_info_t ri,
     struct bnxt_cp_ring *cpr, uint16_t flags_type)
@@ -429,13 +460,7 @@ bnxt_pkt_get_l2(struct bnxt_softc *softc, if_rxd_info_t ri,
 	/* Extract from the first 16-byte BD */
 	if (flags_type & RX_PKT_CMPL_FLAGS_RSS_VALID) {
 		ri->iri_flowid = le32toh(rcp->rss_hash);
-		/*
-		 * TODO: Extract something useful from rcp->rss_hash_type
-		 * (undocumented)
-		 * May be documented in the "LSI ES"
-		 * also check the firmware code.
-		 */
-		ri->iri_rsstype = M_HASHTYPE_OPAQUE;
+		bnxt_set_rsstype(ri, rcp->rss_hash_type);
 	}
 	else {
 		ri->iri_rsstype = M_HASHTYPE_NONE;
@@ -515,13 +540,7 @@ bnxt_pkt_get_tpa(struct bnxt_softc *softc, if_rxd_info_t ri,
 	/* Extract from the first 16-byte BD */
 	if (le16toh(tpas->low.flags_type) & RX_TPA_START_CMPL_FLAGS_RSS_VALID) {
 		ri->iri_flowid = le32toh(tpas->low.rss_hash);
-		/*
-		 * TODO: Extract something useful from tpas->low.rss_hash_type
-		 * (undocumented)
-		 * May be documented in the "LSI ES"
-		 * also check the firmware code.
-		 */
-		ri->iri_rsstype = M_HASHTYPE_OPAQUE;
+		bnxt_set_rsstype(ri, tpas->low.rss_hash_type);
 	}
 	else {
 		ri->iri_rsstype = M_HASHTYPE_NONE;