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Date: Wed, 11 Jun 2008 15:20:21 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: jeff@...zick.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, davem@...emloft.net,
e1000-dev@...ts.sourceforge.net
Subject: Re: [PATCH 1/2] [UPDATED] ixgbe: add LRO support
On Wed, 11 Jun 2008 15:14:17 -0700 Jeff Kirsher wrote:
>
> Support for in-kernel LRO with the ability to enable/disable via ethtool
> based on comments from Ben Hutchings.
>
> Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Signed-off-by: PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>
> ---
>
> drivers/net/ixgbe/ixgbe.h | 9 +++
> drivers/net/ixgbe/ixgbe_ethtool.c | 11 ++++
> drivers/net/ixgbe/ixgbe_main.c | 111 ++++++++++++++++++++++++++++++-------
> 3 files changed, 110 insertions(+), 21 deletions(-)
Is there also a patch to drivers/net/Kconfig that makes IXGBE depend on INET?
You can't just assume that the lro_* functions are always there....
> diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
> index d981134..956914a 100644
> --- a/drivers/net/ixgbe/ixgbe.h
> +++ b/drivers/net/ixgbe/ixgbe.h
> @@ -32,6 +32,7 @@
> #include <linux/types.h>
> #include <linux/pci.h>
> #include <linux/netdevice.h>
> +#include <linux/inet_lro.h>
>
> #include "ixgbe_type.h"
> #include "ixgbe_common.h"
> @@ -100,6 +101,9 @@
> #define IXGBE_TX_FLAGS_VLAN_MASK 0xffff0000
> #define IXGBE_TX_FLAGS_VLAN_SHIFT 16
>
> +#define IXGBE_MAX_LRO_DESCRIPTORS 8
> +#define IXGBE_MAX_LRO_AGGREGATE 32
> +
> /* wrapper around a pointer to a socket buffer,
> * so a DMA handle can be stored along with the buffer */
> struct ixgbe_tx_buffer {
> @@ -150,6 +154,8 @@ struct ixgbe_ring {
> /* cpu for tx queue */
> int cpu;
> #endif
> + struct net_lro_mgr lro_mgr;
> + bool lro_used;
> struct ixgbe_queue_stats stats;
> u8 v_idx; /* maps directly to the index for this ring in the hardware
> * vector array, can also be used for finding the bit in EICR
> @@ -287,6 +293,9 @@ struct ixgbe_adapter {
>
> unsigned long state;
> u64 tx_busy;
> + u64 lro_aggregated;
> + u64 lro_flushed;
> + u64 lro_no_desc;
> };
>
> enum ixbge_state_t {
> diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
> index 4e46377..12990b1 100644
> --- a/drivers/net/ixgbe/ixgbe_ethtool.c
> +++ b/drivers/net/ixgbe/ixgbe_ethtool.c
> @@ -90,6 +90,8 @@ static struct ixgbe_stats ixgbe_gstrings_stats[] = {
> {"rx_header_split", IXGBE_STAT(rx_hdr_split)},
> {"alloc_rx_page_failed", IXGBE_STAT(alloc_rx_page_failed)},
> {"alloc_rx_buff_failed", IXGBE_STAT(alloc_rx_buff_failed)},
> + {"lro_aggregated", IXGBE_STAT(lro_aggregated)},
> + {"lro_flushed", IXGBE_STAT(lro_flushed)},
> };
>
> #define IXGBE_QUEUE_STATS_LEN \
> @@ -787,6 +789,7 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev,
> int stat_count = sizeof(struct ixgbe_queue_stats) / sizeof(u64);
> int j, k;
> int i;
> + u64 aggregated = 0, flushed = 0, no_desc = 0;
>
> ixgbe_update_stats(adapter);
> for (i = 0; i < IXGBE_GLOBAL_STATS_LEN; i++) {
> @@ -801,11 +804,17 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev,
> i += k;
> }
> for (j = 0; j < adapter->num_rx_queues; j++) {
> + aggregated += adapter->rx_ring[j].lro_mgr.stats.aggregated;
> + flushed += adapter->rx_ring[j].lro_mgr.stats.flushed;
> + no_desc += adapter->rx_ring[j].lro_mgr.stats.no_desc;
> queue_stat = (u64 *)&adapter->rx_ring[j].stats;
> for (k = 0; k < stat_count; k++)
> data[i + k] = queue_stat[k];
> i += k;
> }
> + adapter->lro_aggregated = aggregated;
> + adapter->lro_flushed = flushed;
> + adapter->lro_no_desc = no_desc;
> }
>
> static void ixgbe_get_strings(struct net_device *netdev, u32 stringset,
> @@ -973,6 +982,8 @@ static struct ethtool_ops ixgbe_ethtool_ops = {
> .get_ethtool_stats = ixgbe_get_ethtool_stats,
> .get_coalesce = ixgbe_get_coalesce,
> .set_coalesce = ixgbe_set_coalesce,
> + .get_flags = ethtool_op_get_flags,
> + .set_flags = ethtool_op_set_flags,
> };
>
> void ixgbe_set_ethtool_ops(struct net_device *netdev)
> diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
> index 7b85922..04c6482 100644
> --- a/drivers/net/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ixgbe/ixgbe_main.c
> @@ -389,24 +389,39 @@ static int __ixgbe_notify_dca(struct device *dev, void *data)
> * ixgbe_receive_skb - Send a completed packet up the stack
> * @adapter: board private structure
> * @skb: packet to send up
> - * @is_vlan: packet has a VLAN tag
> - * @tag: VLAN tag from descriptor
> + * @status: hardware indication of status of receive
> + * @rx_ring: rx descriptor ring (for a specific queue) to setup
> + * @rx_desc: rx descriptor
> **/
> static void ixgbe_receive_skb(struct ixgbe_adapter *adapter,
> - struct sk_buff *skb, bool is_vlan,
> - u16 tag)
> + struct sk_buff *skb, u8 status,
> + struct ixgbe_ring *ring,
> + union ixgbe_adv_rx_desc *rx_desc)
> {
> - if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
> - if (adapter->vlgrp && is_vlan)
> - vlan_hwaccel_receive_skb(skb, adapter->vlgrp, tag);
> - else
> - netif_receive_skb(skb);
> - } else {
> + bool is_vlan = (status & IXGBE_RXD_STAT_VP);
> + u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);
>
> + if (adapter->netdev->features & NETIF_F_LRO &&
> + skb->ip_summed == CHECKSUM_UNNECESSARY) {
> if (adapter->vlgrp && is_vlan)
> - vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
> + lro_vlan_hwaccel_receive_skb(&ring->lro_mgr, skb,
> + adapter->vlgrp, tag,
> + rx_desc);
> else
> - netif_rx(skb);
> + lro_receive_skb(&ring->lro_mgr, skb, rx_desc);
> + ring->lro_used = true;
> + } else {
> + if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
> + if (adapter->vlgrp && is_vlan)
> + vlan_nw_accel_receive_skb(skb, adapter->vlgrp, tag);
> + else
> + netif_receive_skb(skb);
> + } else {
> + if (adapter->vlgrp && is_vlan)
> + vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
> + else
> + netif_rx(skb);
> + }
> }
> }
>
> @@ -546,8 +561,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
> struct sk_buff *skb;
> unsigned int i;
> u32 upper_len, len, staterr;
> - u16 hdr_info, vlan_tag;
> - bool is_vlan, cleaned = false;
> + u16 hdr_info;
> + bool cleaned = false;
> int cleaned_count = 0;
> unsigned int total_rx_bytes = 0, total_rx_packets = 0;
>
> @@ -556,8 +571,6 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
> rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);
> staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
> rx_buffer_info = &rx_ring->rx_buffer_info[i];
> - is_vlan = (staterr & IXGBE_RXD_STAT_VP);
> - vlan_tag = le16_to_cpu(rx_desc->wb.upper.vlan);
>
> while (staterr & IXGBE_RXD_STAT_DD) {
> if (*work_done >= work_to_do)
> @@ -635,7 +648,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_adapter *adapter,
> total_rx_packets++;
>
> skb->protocol = eth_type_trans(skb, netdev);
> - ixgbe_receive_skb(adapter, skb, is_vlan, vlan_tag);
> + ixgbe_receive_skb(adapter, skb, staterr, rx_ring, rx_desc);
> netdev->last_rx = jiffies;
>
> next_desc:
> @@ -652,8 +665,11 @@ next_desc:
> rx_buffer_info = next_buffer;
>
> staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
> - is_vlan = (staterr & IXGBE_RXD_STAT_VP);
> - vlan_tag = le16_to_cpu(rx_desc->wb.upper.vlan);
> + }
> +
> + if (rx_ring->lro_used) {
> + lro_flush_all(&rx_ring->lro_mgr);
> + rx_ring->lro_used = false;
> }
>
> rx_ring->next_to_clean = i;
> @@ -1382,6 +1398,33 @@ static void ixgbe_configure_tx(struct ixgbe_adapter *adapter)
>
> #define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2
> /**
> + * ixgbe_get_skb_hdr - helper function for LRO header processing
> + * @skb: pointer to sk_buff to be added to LRO packet
> + * @iphdr: pointer to tcp header structure
> + * @tcph: pointer to tcp header structure
> + * @hdr_flags: pointer to header flags
> + * @priv: private data
> + **/
> +static int ixgbe_get_skb_hdr(struct sk_buff *skb, void **iphdr, void **tcph,
> + u64 *hdr_flags, void *priv)
> +{
> + union ixgbe_adv_rx_desc *rx_desc = priv;
> +
> + /* Verify that this is a valid IPv4 TCP packet */
> + if (!(rx_desc->wb.lower.lo_dword.pkt_info &
> + (IXGBE_RXDADV_PKTTYPE_IPV4 | IXGBE_RXDADV_PKTTYPE_TCP)))
> + return -1;
> +
> + /* Set network headers */
> + skb_reset_network_header(skb);
> + skb_set_transport_header(skb, ip_hdrlen(skb));
> + *iphdr = ip_hdr(skb);
> + *tcph = tcp_hdr(skb);
> + *hdr_flags = LRO_IPV4 | LRO_TCP;
> + return 0;
> +}
> +
> +/**
> * ixgbe_configure_rx - Configure 8254x Receive Unit after Reset
> * @adapter: board private structure
> *
> @@ -1470,6 +1513,17 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
> adapter->rx_ring[i].tail = IXGBE_RDT(i);
> }
>
> + /* Intitial LRO Settings */
> + adapter->rx_ring[i].lro_mgr.max_aggr = IXGBE_MAX_LRO_AGGREGATE;
> + adapter->rx_ring[i].lro_mgr.max_desc = IXGBE_MAX_LRO_DESCRIPTORS;
> + adapter->rx_ring[i].lro_mgr.get_skb_header = ixgbe_get_skb_hdr;
> + adapter->rx_ring[i].lro_mgr.features = LRO_F_EXTRACT_VLAN_ID;
> + if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL))
> + adapter->rx_ring[i].lro_mgr.features |= LRO_F_NAPI;
> + adapter->rx_ring[i].lro_mgr.dev = adapter->netdev;
> + adapter->rx_ring[i].lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
> + adapter->rx_ring[i].lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
> +
> if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) {
> /* Fill out redirection table */
> for (i = 0, j = 0; i < 128; i++, j++) {
> @@ -2489,12 +2543,18 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
> struct pci_dev *pdev = adapter->pdev;
> int size;
>
> + size = sizeof(struct net_lro_desc) * IXGBE_MAX_LRO_DESCRIPTORS;
> + rxdr->lro_mgr.lro_arr = vmalloc(size);
> + if (!rxdr->lro_mgr.lro_arr)
> + return -ENOMEM;
> + memset(rxdr->lro_mgr.lro_arr, 0, size);
> +
> size = sizeof(struct ixgbe_rx_buffer) * rxdr->count;
> rxdr->rx_buffer_info = vmalloc(size);
> if (!rxdr->rx_buffer_info) {
> DPRINTK(PROBE, ERR,
> "vmalloc allocation failed for the rx desc ring\n");
> - return -ENOMEM;
> + goto alloc_failed;
> }
> memset(rxdr->rx_buffer_info, 0, size);
>
> @@ -2508,13 +2568,18 @@ int ixgbe_setup_rx_resources(struct ixgbe_adapter *adapter,
> DPRINTK(PROBE, ERR,
> "Memory allocation failed for the rx desc ring\n");
> vfree(rxdr->rx_buffer_info);
> - return -ENOMEM;
> + goto alloc_failed;
> }
>
> rxdr->next_to_clean = 0;
> rxdr->next_to_use = 0;
>
> return 0;
> +
> +alloc_failed:
> + vfree(rxdr->lro_mgr.lro_arr);
> + rxdr->lro_mgr.lro_arr = NULL;
> + return -ENOMEM;
> }
>
> /**
> @@ -2565,6 +2630,9 @@ static void ixgbe_free_rx_resources(struct ixgbe_adapter *adapter,
> {
> struct pci_dev *pdev = adapter->pdev;
>
> + vfree(rx_ring->lro_mgr.lro_arr);
> + rx_ring->lro_mgr.lro_arr = NULL;
> +
> ixgbe_clean_rx_ring(adapter, rx_ring);
>
> vfree(rx_ring->rx_buffer_info);
> @@ -3517,6 +3585,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
> NETIF_F_HW_VLAN_RX |
> NETIF_F_HW_VLAN_FILTER;
>
> + netdev->features |= NETIF_F_LRO;
> netdev->features |= NETIF_F_TSO;
>
> netdev->features |= NETIF_F_TSO6;
---
~Randy
--
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