Merge branch 'nfp-crc32-rss-hash-port-name-reporting-and-misc-fastpath-cleanups'

Jakub Kicinski says:

====================
nfp: CRC32 RSS hash, port name reporting and misc fastpath cleanups

This series adds support for CRC32 RSS hash function to kernel API
of which NFP driver immediately makes use.  There is also a
.ndo_get_phys_port_name() implementation conforming to switchdev
name format.  Small patch takes advantage of napi_complete_done()'s
return code.  Simon provides a fix for potentially trusting values
returned from FW too much.

A handful of unassuming fast path adjustments is also thrown in to make
the upcoming xdp_adjust_head() series easier to review.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/nfp_net.h

@@ -112,6 +112,7 @@
 
 /* Forward declarations */
 struct nfp_cpp;
+struct nfp_eth_table_port;
 struct nfp_net;
 struct nfp_net_r_vector;
 
@@ -434,11 +435,12 @@ struct nfp_stat_pair {
 
 /**
  * struct nfp_net - NFP network device structure
- * @pdev:               Backpointer to PCI device
+ * @dev:		Backpointer to struct device
  * @netdev:             Backpointer to net_device structure
  * @is_vf:              Is the driver attached to a VF?
  * @bpf_offload_skip_sw:  Offloaded BPF program will not be rerun by cls_bpf
  * @bpf_offload_xdp:	Offloaded BPF program is XDP
+ * @chained_metadata_format:  Firemware will use new metadata format
  * @ctrl:               Local copy of the control register/word.
  * @fl_bufsz:           Currently configured size of the freelist buffers
  * @rx_offset:		Offset in the RX buffers where packet data starts
@@ -446,6 +448,7 @@ struct nfp_stat_pair {
  * @fw_ver:             Firmware version
  * @cap:                Capabilities advertised by the Firmware
  * @max_mtu:            Maximum support MTU advertised by the Firmware
+ * @rss_hfunc:		RSS selected hash function
  * @rss_cfg:            RSS configuration
  * @rss_key:            RSS secret key
  * @rss_itbl:           RSS indirection table
@@ -494,15 +497,18 @@ struct nfp_stat_pair {
  * @debugfs_dir:	Device directory in debugfs
  * @ethtool_dump_flag:	Ethtool dump flag
  * @port_list:		Entry on device port list
+ * @pdev:		Backpointer to PCI device
  * @cpp:		CPP device handle if available
+ * @eth_port:		Translated ETH Table port entry
  */
 struct nfp_net {
-	struct pci_dev *pdev;
+	struct device *dev;
 	struct net_device *netdev;
 
 	unsigned is_vf:1;
 	unsigned bpf_offload_skip_sw:1;
 	unsigned bpf_offload_xdp:1;
+	unsigned chained_metadata_format:1;
 
 	u32 ctrl;
 	u32 fl_bufsz;
@@ -518,6 +524,7 @@ struct nfp_net {
 	u32 cap;
 	u32 max_mtu;
 
+	u8 rss_hfunc;
 	u32 rss_cfg;
 	u8 rss_key[NFP_NET_CFG_RSS_KEY_SZ];
 	u8 rss_itbl[NFP_NET_CFG_RSS_ITBL_SZ];
@@ -584,7 +591,10 @@ struct nfp_net {
 
 	struct list_head port_list;
 
+	struct pci_dev *pdev;
 	struct nfp_cpp *cpp;
+
+	struct nfp_eth_table_port *eth_port;
 };
 
 struct nfp_net_ring_set {
@@ -776,6 +786,7 @@ void nfp_net_netdev_clean(struct net_device *netdev);
 void nfp_net_set_ethtool_ops(struct net_device *netdev);
 void nfp_net_info(struct nfp_net *nn);
 int nfp_net_reconfig(struct nfp_net *nn, u32 update);
+unsigned int nfp_net_rss_key_sz(struct nfp_net *nn);
 void nfp_net_rss_write_itbl(struct nfp_net *nn);
 void nfp_net_rss_write_key(struct nfp_net *nn);
 void nfp_net_coalesce_write_cfg(struct nfp_net *nn);

drivers/net/ethernet/netronome/nfp/nfp_net_ctrl.h

 /*
- * Copyright (C) 2015 Netronome Systems, Inc.
+ * Copyright (C) 2015-2017 Netronome Systems, Inc.
  *
  * This software is dual licensed under the GNU General License Version 2,
  * June 1991 as shown in the file COPYING in the top-level directory of this
@@ -191,6 +191,14 @@
 #define NFP_NET_CFG_RX_OFFSET		0x0050
 #define NFP_NET_CFG_RX_OFFSET_DYNAMIC		0	/* Prepend mode */
 
+/**
+ * RSS capabilities
+ * @NFP_NET_CFG_RSS_CAP_HFUNC:	supported hash functions (same bits as
+ *				@NFP_NET_CFG_RSS_HFUNC)
+ */
+#define NFP_NET_CFG_RSS_CAP		0x0054
+#define   NFP_NET_CFG_RSS_CAP_HFUNC	  0xff000000
+
 /**
  * VXLAN/UDP encap configuration
  * @NFP_NET_CFG_VXLAN_PORT:	Base address of table of tunnels' UDP dst ports
@@ -249,7 +257,11 @@
 #define   NFP_NET_CFG_RSS_IPV4_UDP        (1 << 11) /* RSS for IPv4/UDP */
 #define   NFP_NET_CFG_RSS_IPV6_TCP        (1 << 12) /* RSS for IPv6/TCP */
 #define   NFP_NET_CFG_RSS_IPV6_UDP        (1 << 13) /* RSS for IPv6/UDP */
+#define   NFP_NET_CFG_RSS_HFUNC		  0xff000000
 #define   NFP_NET_CFG_RSS_TOEPLITZ        (1 << 24) /* Use Toeplitz hash */
+#define   NFP_NET_CFG_RSS_XOR		  (1 << 25) /* Use XOR as hash */
+#define   NFP_NET_CFG_RSS_CRC32		  (1 << 26) /* Use CRC32 as hash */
+#define   NFP_NET_CFG_RSS_HFUNCS	  3
 #define NFP_NET_CFG_RSS_KEY             (NFP_NET_CFG_RSS_BASE + 0x4)
 #define NFP_NET_CFG_RSS_KEY_SZ          0x28
 #define NFP_NET_CFG_RSS_ITBL            (NFP_NET_CFG_RSS_BASE + 0x4 + \

drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c

@@ -64,8 +64,10 @@ static int nfp_net_debugfs_rx_q_read(struct seq_file *file, void *data)
 	rx_rd_p = nfp_qcp_rd_ptr_read(rx_ring->qcp_rx);
 	rx_wr_p = nfp_qcp_wr_ptr_read(rx_ring->qcp_rx);
 
-	seq_printf(file, "RX[%02d]: H_RD=%d H_WR=%d FL_RD=%d FL_WR=%d RX_RD=%d RX_WR=%d\n",
-		   rx_ring->idx, rx_ring->rd_p, rx_ring->wr_p,
+	seq_printf(file, "RX[%02d,%02d,%02d]: cnt=%d dma=%pad host=%p   H_RD=%d H_WR=%d FL_RD=%d FL_WR=%d RX_RD=%d RX_WR=%d\n",
+		   rx_ring->idx, rx_ring->fl_qcidx, rx_ring->rx_qcidx,
+		   rx_ring->cnt, &rx_ring->dma, rx_ring->rxds,
+		   rx_ring->rd_p, rx_ring->wr_p,
 		   fl_rd_p, fl_wr_p, rx_rd_p, rx_wr_p);
 
 	for (i = 0; i < rxd_cnt; i++) {
@@ -151,8 +153,11 @@ static int nfp_net_debugfs_tx_q_read(struct seq_file *file, void *data)
 	d_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
 	d_wr_p = nfp_qcp_wr_ptr_read(tx_ring->qcp_q);
 
-	seq_printf(file, "TX[%02d]: H_RD=%d H_WR=%d D_RD=%d D_WR=%d\n",
-		   tx_ring->idx, tx_ring->rd_p, tx_ring->wr_p, d_rd_p, d_wr_p);
+	seq_printf(file, "TX[%02d,%02d%s]: cnt=%d dma=%pad host=%p   H_RD=%d H_WR=%d D_RD=%d D_WR=%d\n",
+		   tx_ring->idx, tx_ring->qcidx,
+		   tx_ring == r_vec->tx_ring ? "" : "xdp",
+		   tx_ring->cnt, &tx_ring->dma, tx_ring->txds,
+		   tx_ring->rd_p, tx_ring->wr_p, d_rd_p, d_wr_p);
 
 	for (i = 0; i < txd_cnt; i++) {
 		txd = &tx_ring->txds[i];

drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c

@@ -40,6 +40,7 @@
  *          Brad Petrus <brad.petrus@netronome.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
@@ -454,7 +455,7 @@ static int nfp_net_set_rss_hash_opt(struct nfp_net *nn,
 		return -EINVAL;
 	}
 
-	new_rss_cfg |= NFP_NET_CFG_RSS_TOEPLITZ;
+	new_rss_cfg |= FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc);
 	new_rss_cfg |= NFP_NET_CFG_RSS_MASK;
 
 	if (new_rss_cfg == nn->rss_cfg)
@@ -496,7 +497,12 @@ static u32 nfp_net_get_rxfh_indir_size(struct net_device *netdev)
 
 static u32 nfp_net_get_rxfh_key_size(struct net_device *netdev)
 {
-	return NFP_NET_CFG_RSS_KEY_SZ;
+	struct nfp_net *nn = netdev_priv(netdev);
+
+	if (!(nn->cap & NFP_NET_CFG_CTRL_RSS))
+		return -EOPNOTSUPP;
+
+	return nfp_net_rss_key_sz(nn);
 }
 
 static int nfp_net_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
@@ -512,9 +518,12 @@ static int nfp_net_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
 		for (i = 0; i < ARRAY_SIZE(nn->rss_itbl); i++)
 			indir[i] = nn->rss_itbl[i];
 	if (key)
-		memcpy(key, nn->rss_key, NFP_NET_CFG_RSS_KEY_SZ);
-	if (hfunc)
-		*hfunc = ETH_RSS_HASH_TOP;
+		memcpy(key, nn->rss_key, nfp_net_rss_key_sz(nn));
+	if (hfunc) {
+		*hfunc = nn->rss_hfunc;
+		if (*hfunc >= 1 << ETH_RSS_HASH_FUNCS_COUNT)
+			*hfunc = ETH_RSS_HASH_UNKNOWN;
+	}
 
 	return 0;
 }
@@ -527,14 +536,14 @@ static int nfp_net_set_rxfh(struct net_device *netdev,
 	int i;
 
 	if (!(nn->cap & NFP_NET_CFG_CTRL_RSS) ||
-	    !(hfunc == ETH_RSS_HASH_NO_CHANGE || hfunc == ETH_RSS_HASH_TOP))
+	    !(hfunc == ETH_RSS_HASH_NO_CHANGE || hfunc == nn->rss_hfunc))
 		return -EOPNOTSUPP;
 
 	if (!key && !indir)
 		return 0;
 
 	if (key) {
-		memcpy(nn->rss_key, key, NFP_NET_CFG_RSS_KEY_SZ);
+		memcpy(nn->rss_key, key, nfp_net_rss_key_sz(nn));
 		nfp_net_rss_write_key(nn);
 	}
 	if (indir) {

drivers/net/ethernet/netronome/nfp/nfp_net_main.c

@@ -141,8 +141,7 @@ nfp_net_get_mac_addr_hwinfo(struct nfp_net *nn, struct nfp_cpp *cpp,
 
 	mac_str = nfp_hwinfo_lookup(cpp, name);
 	if (!mac_str) {
-		dev_warn(&nn->pdev->dev,
-			 "Can't lookup MAC address. Generate\n");
+		dev_warn(nn->dev, "Can't lookup MAC address. Generate\n");
 		eth_hw_addr_random(nn->netdev);
 		return;
 	}
@@ -150,7 +149,7 @@ nfp_net_get_mac_addr_hwinfo(struct nfp_net *nn, struct nfp_cpp *cpp,
 	if (sscanf(mac_str, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
 		   &mac_addr[0], &mac_addr[1], &mac_addr[2],
 		   &mac_addr[3], &mac_addr[4], &mac_addr[5]) != 6) {
-		dev_warn(&nn->pdev->dev,
+		dev_warn(nn->dev,
 			 "Can't parse MAC address (%s). Generate.\n", mac_str);
 		eth_hw_addr_random(nn->netdev);
 		return;
@@ -178,6 +177,8 @@ nfp_net_get_mac_addr(struct nfp_net *nn, struct nfp_pf *pf, unsigned int id)
 		if (pf->eth_tbl->ports[i].eth_index == id) {
 			const u8 *mac_addr = pf->eth_tbl->ports[i].mac_addr;
 
+			nn->eth_port = &pf->eth_tbl->ports[i];
+
 			ether_addr_copy(nn->netdev->dev_addr, mac_addr);
 			ether_addr_copy(nn->netdev->perm_addr, mac_addr);
 			return;

drivers/net/ethernet/netronome/nfp/nfp_net_offload.c

@@ -168,8 +168,7 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn,
 	start_off = nn_readw(nn, NFP_NET_CFG_BPF_START);
 	done_off = nn_readw(nn, NFP_NET_CFG_BPF_DONE);
 
-	*code = dma_zalloc_coherent(&nn->pdev->dev, code_sz, dma_addr,
-				    GFP_KERNEL);
+	*code = dma_zalloc_coherent(nn->dev, code_sz, dma_addr, GFP_KERNEL);
 	if (!*code)
 		return -ENOMEM;
 
@@ -181,7 +180,7 @@ nfp_net_bpf_offload_prepare(struct nfp_net *nn,
 	return 0;
 
 out:
-	dma_free_coherent(&nn->pdev->dev, code_sz, *code, *dma_addr);
+	dma_free_coherent(nn->dev, code_sz, *code, *dma_addr);
 	return ret;
 }
 
@@ -214,7 +213,7 @@ nfp_net_bpf_load_and_start(struct nfp_net *nn, u32 tc_flags,
 	if (err)
 		nn_err(nn, "FW command error while enabling BPF: %d\n", err);
 
-	dma_free_coherent(&nn->pdev->dev, code_sz, code, dma_addr);
+	dma_free_coherent(nn->dev, code_sz, code, dma_addr);
 
 	nfp_net_bpf_stats_reset(nn);
 	mod_timer(&nn->rx_filter_stats_timer, jiffies + NFP_NET_STAT_POLL_IVL);

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c

@@ -134,9 +134,32 @@ nfp_eth_port_translate(const struct eth_table_entry *src, unsigned int index,
 
 	nfp_eth_copy_mac_reverse(dst->mac_addr, src->mac_addr);
 
-	snprintf(dst->label, sizeof(dst->label) - 1, "%llu.%llu",
-		 FIELD_GET(NSP_ETH_PORT_PHYLABEL, port),
-		 FIELD_GET(NSP_ETH_PORT_LABEL, port));
+	dst->label_port = FIELD_GET(NSP_ETH_PORT_PHYLABEL, port);
+	dst->label_subport = FIELD_GET(NSP_ETH_PORT_LABEL, port);
+}
+
+static void
+nfp_eth_mark_split_ports(struct nfp_cpp *cpp, struct nfp_eth_table *table)
+{
+	unsigned int i, j;
+
+	for (i = 0; i < table->count; i++)
+		for (j = 0; j < table->count; j++) {
+			if (i == j)
+				continue;
+			if (table->ports[i].label_port !=
+			    table->ports[j].label_port)
+				continue;
+			if (table->ports[i].label_subport ==
+			    table->ports[j].label_subport)
+				nfp_warn(cpp,
+					 "Port %d subport %d is a duplicate\n",
+					 table->ports[i].label_port,
+					 table->ports[i].label_subport);
+
+			table->ports[i].is_split = true;
+			break;
+		}
 }
 
 /**
@@ -168,8 +191,7 @@ __nfp_eth_read_ports(struct nfp_cpp *cpp, struct nfp_nsp *nsp)
 {
 	struct eth_table_entry *entries;
 	struct nfp_eth_table *table;
-	unsigned int cnt;
-	int i, j, ret;
+	int i, j, ret, cnt = 0;
 
 	entries = kzalloc(NSP_ETH_TABLE_SIZE, GFP_KERNEL);
 	if (!entries)
@@ -178,24 +200,27 @@ __nfp_eth_read_ports(struct nfp_cpp *cpp, struct nfp_nsp *nsp)
 	ret = nfp_nsp_read_eth_table(nsp, entries, NSP_ETH_TABLE_SIZE);
 	if (ret < 0) {
 		nfp_err(cpp, "reading port table failed %d\n", ret);
-		kfree(entries);
-		return NULL;
+		goto err;
 	}
 
-	/* Some versions of flash will give us 0 instead of port count */
-	cnt = ret;
-	if (!cnt) {
 	for (i = 0; i < NSP_ETH_MAX_COUNT; i++)
 		if (entries[i].port & NSP_ETH_PORT_LANES_MASK)
 			cnt++;
+
+	/* Some versions of flash will give us 0 instead of port count.
+	 * For those that give a port count, verify it against the value
+	 * calculated above.
+	 */
+	if (ret && ret != cnt) {
+		nfp_err(cpp, "table entry count reported (%d) does not match entries present (%d)\n",
+			ret, cnt);
+		goto err;
 	}
 
 	table = kzalloc(sizeof(*table) +
 			sizeof(struct nfp_eth_table_port) * cnt, GFP_KERNEL);
-	if (!table) {
-		kfree(entries);
-		return NULL;
-	}
+	if (!table)
+		goto err;
 
 	table->count = cnt;
 	for (i = 0, j = 0; i < NSP_ETH_MAX_COUNT; i++)
@@ -203,9 +228,15 @@ __nfp_eth_read_ports(struct nfp_cpp *cpp, struct nfp_nsp *nsp)
 			nfp_eth_port_translate(&entries[i], i,
 					       &table->ports[j++]);
 
+	nfp_eth_mark_split_ports(cpp, table);
+
 	kfree(entries);
 
 	return table;
+
+err:
+	kfree(entries);
+	return NULL;
 }
 
 /**

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.h

@@ -49,10 +49,13 @@
  * @lanes:	number of channels
  * @speed:	interface speed (in Mbps)
  * @mac_addr:	interface MAC address
- * @label:	interface id string
+ * @label_port:	port id
+ * @label_subport:  id of interface within port (for split ports)
  * @enabled:	is enabled?
  * @tx_enabled:	is TX enabled?
  * @rx_enabled:	is RX enabled?
+ *
+ * @is_split:	is interface part of a split port
  */
 struct nfp_eth_table {
 	unsigned int count;
@@ -65,14 +68,22 @@ struct nfp_eth_table {
 		unsigned int speed;
 
 		u8 mac_addr[ETH_ALEN];
-		char label[8];
+
+		u8 label_port;
+		u8 label_subport;
 
 		bool enabled;
 		bool tx_enabled;
 		bool rx_enabled;
+
+		/* Computed fields */
+		bool is_split;
 	} ports[0];
 };
 
+struct nfp_cpp;
+struct nfp_nsp;
+
 struct nfp_eth_table *nfp_eth_read_ports(struct nfp_cpp *cpp);
 struct nfp_eth_table *
 __nfp_eth_read_ports(struct nfp_cpp *cpp, struct nfp_nsp *nsp);

include/linux/ethtool.h

@@ -60,6 +60,7 @@ enum ethtool_phys_id_state {
 enum {
 	ETH_RSS_HASH_TOP_BIT, /* Configurable RSS hash function - Toeplitz */
 	ETH_RSS_HASH_XOR_BIT, /* Configurable RSS hash function - Xor */
+	ETH_RSS_HASH_CRC32_BIT, /* Configurable RSS hash function - Crc32 */
 
 	/*
 	 * Add your fresh new hash function bits above and remember to update
@@ -73,6 +74,7 @@ enum {
 
 #define ETH_RSS_HASH_TOP	__ETH_RSS_HASH(TOP)
 #define ETH_RSS_HASH_XOR	__ETH_RSS_HASH(XOR)
+#define ETH_RSS_HASH_CRC32	__ETH_RSS_HASH(CRC32)
 
 #define ETH_RSS_HASH_UNKNOWN	0
 #define ETH_RSS_HASH_NO_CHANGE	0

net/core/ethtool.c

@@ -109,6 +109,7 @@ static const char
 rss_hash_func_strings[ETH_RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
 	[ETH_RSS_HASH_TOP_BIT] =	"toeplitz",
 	[ETH_RSS_HASH_XOR_BIT] =	"xor",
+	[ETH_RSS_HASH_CRC32_BIT] =	"crc32",
 };
 
 static const char