[PATCH] net/nfp: add support for hardware RSS v2

[Alejandro Lucero <alejandro.lucero@netronome.com>]

hained metadata instead of prepend metadata was added in
firmware version 4. However, it could be old firmwares evolving
but not supporting chained metadata.

This patch adds support for an old firmware being updated and
getting a firmware version number higher than 4, but it still not
implementing chained metadata.

Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
---
 drivers/net/nfp/nfp_net.c      | 29 ++++++++++++++++-------------
 drivers/net/nfp/nfp_net_ctrl.h |  1 +
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/drivers/net/nfp/nfp_net.c b/drivers/net/nfp/nfp_net.c
index 07abe7f..f5c5767 100644
--- a/drivers/net/nfp/nfp_net.c
+++ b/drivers/net/nfp/nfp_net.c
@@ -1958,14 +1958,10 @@ enum nfp_qcp_ptr {
 	if (!(hw->ctrl & NFP_NET_CFG_CTRL_RSS))
 		return;
 
-	if (NFD_CFG_MAJOR_VERSION_of(hw->ver) <= 3) {
-		if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
-			return;
-
-		hash = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_OFFSET);
-		hash_type = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_TYPE_OFFSET);
-
-	} else if (NFP_DESC_META_LEN(rxd)) {
+	/* this is true for new firmwares */
+	if (likely(((hw->cap & NFP_NET_CFG_CTRL_RSS2) ||
+	    (NFD_CFG_MAJOR_VERSION_of(hw->ver) == 4)) &&
+	     NFP_DESC_META_LEN(rxd))) {
 		/*
 		 * new metadata api:
 		 * <----  32 bit  ----->
@@ -1998,7 +1994,11 @@ enum nfp_qcp_ptr {
 			return;
 		}
 	} else {
-		return;
+		if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
+			return;
+
+		hash = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_OFFSET);
+		hash_type = rte_be_to_cpu_32(*(uint32_t *)NFP_HASH_TYPE_OFFSET);
 	}
 
 	mbuf->hash.rss = hash;
@@ -2953,9 +2953,11 @@ uint32_t nfp_net_txq_full(struct nfp_net_txq *txq)
 	else
 		hw->rx_offset = nn_cfg_readl(hw, NFP_NET_CFG_RX_OFFSET_ADDR);
 
-	PMD_INIT_LOG(INFO, "VER: %#x, Maximum supported MTU: %d",
-		     hw->ver, hw->max_mtu);
-	PMD_INIT_LOG(INFO, "CAP: %#x, %s%s%s%s%s%s%s%s%s%s%s%s", hw->cap,
+	PMD_INIT_LOG(INFO, "VER: %u.%u, Maximum supported MTU: %d",
+			   NFD_CFG_MAJOR_VERSION_of(hw->ver),
+			   NFD_CFG_MINOR_VERSION_of(hw->ver), hw->max_mtu);
+
+	PMD_INIT_LOG(INFO, "CAP: %#x, %s%s%s%s%s%s%s%s%s%s%s%s%s", hw->cap,
 		     hw->cap & NFP_NET_CFG_CTRL_PROMISC ? "PROMISC " : "",
 		     hw->cap & NFP_NET_CFG_CTRL_L2BC    ? "L2BCFILT " : "",
 		     hw->cap & NFP_NET_CFG_CTRL_L2MC    ? "L2MCFILT " : "",
@@ -2967,7 +2969,8 @@ uint32_t nfp_net_txq_full(struct nfp_net_txq *txq)
 		     hw->cap & NFP_NET_CFG_CTRL_GATHER  ? "GATHER "  : "",
 		     hw->cap & NFP_NET_CFG_CTRL_LSO     ? "TSO "     : "",
 		     hw->cap & NFP_NET_CFG_CTRL_LSO2     ? "TSOv2 "     : "",
-		     hw->cap & NFP_NET_CFG_CTRL_RSS     ? "RSS "     : "");
+		     hw->cap & NFP_NET_CFG_CTRL_RSS     ? "RSS "     : "",
+		     hw->cap & NFP_NET_CFG_CTRL_RSS2     ? "RSSv2 "     : "");
 
 	hw->ctrl = 0;
 
diff --git a/drivers/net/nfp/nfp_net_ctrl.h b/drivers/net/nfp/nfp_net_ctrl.h
index 7d242d3..14eb176 100644
--- a/drivers/net/nfp/nfp_net_ctrl.h
+++ b/drivers/net/nfp/nfp_net_ctrl.h
@@ -121,6 +121,7 @@
 #define   NFP_NET_CFG_CTRL_NVGRE          (0x1 << 25) /* Enable NVGRE */
 #define   NFP_NET_CFG_CTRL_MSIX_TX_OFF    (0x1 << 26) /* Disable MSIX for TX */
 #define   NFP_NET_CFG_CTRL_LSO2           (0x1 << 28) /* LSO/TSO (version 2) */
+#define   NFP_NET_CFG_CTRL_RSS2           (0x1 << 29) /* RSS (version 2) */
 #define NFP_NET_CFG_UPDATE              0x0004
 #define   NFP_NET_CFG_UPDATE_GEN          (0x1 <<  0) /* General update */
 #define   NFP_NET_CFG_UPDATE_RING         (0x1 <<  1) /* Ring config change */
-- 
1.9.1