Re: [PATCH] s2io: read rx_packets count from the hardware stats
From: Jon Mason <hidden>
Date: 2010-06-30 00:59:53
On Thu, Jun 24, 2010 at 04:32:32PM -0700, Michal Schmidt wrote:
Most of the statistics the s2io driver provides in /proc/net/dev it reads directly from the hardware counters. For some reason it does not do that for rx_packets. It counts rx_packets purely in software. A customer reported a bug where in /proc/net/dev the 'multicast' counter was increasing faster than 'packets' ( = rx_packets in the source code). This confuses userspace, especially snmpd. The hardware provides a counter for the total number of received frames (RMAC_VLD_FRMS) which the driver can use for the rx_packets statistic. By reading both statistics from the hardware it makes sure that all multicast frames are included in the total.
On the Xframe adapter, there is a issue with the multicast statistics counter. It includes broadcast and pause frames in its count. This is most likely the cause of the issue you are seeing. While, looking over the patch you submitted, I noticed other issues with the s2io_get_stats function. I have a patch that I will push soon that addresses the multicast issue, the issues I discovered, and the octet issues Dave suggested. Thanks, Jon
quoted hunk ↗ jump to hunk
The customer tested a patch like this (only modified for RHEL5) with S2io Inc. Xframe II 10Gbps Ethernet (rev 02) and it fixed the problem. Signed-off-by: Michal Schmidt <redacted> --- drivers/net/s2io.c | 11 ++++++----- drivers/net/s2io.h | 1 - 2 files changed, 6 insertions(+), 6 deletions(-)diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c index 668327c..eefc4b2 100644 --- a/drivers/net/s2io.c +++ b/drivers/net/s2io.c@@ -4919,6 +4919,10 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev) sp->stats.tx_packets; sp->stats.tx_packets = le32_to_cpu(stats->tmac_frms); + dev->stats.rx_packets += le32_to_cpu(stats->rmac_vld_frms) - + sp->stats.rx_packets; + sp->stats.rx_packets = le32_to_cpu(stats->rmac_vld_frms); + dev->stats.tx_errors += le32_to_cpu(stats->tmac_any_err_frms) - sp->stats.tx_errors; sp->stats.tx_errors = le32_to_cpu(stats->tmac_any_err_frms);@@ -4935,12 +4939,11 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev) sp->stats.rx_length_errors; sp->stats.rx_length_errors = le64_to_cpu(stats->rmac_long_frms); - /* collect per-ring rx_packets and rx_bytes */ - dev->stats.rx_packets = dev->stats.rx_bytes = 0; + /* collect per-ring rx_bytes */ + dev->stats.rx_bytes = 0; for (i = 0; i < config->rx_ring_num; i++) { struct ring_info *ring = &mac_control->rings[i]; - dev->stats.rx_packets += ring->rx_packets; dev->stats.rx_bytes += ring->rx_bytes; }@@ -7455,8 +7458,6 @@ static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp) } } - /* Updating statistics */ - ring_data->rx_packets++; rxdp->Host_Control = 0; if (sp->rxd_mode == RXD_MODE_1) { int len = RXD_GET_BUFFER0_SIZE_1(rxdp->Control_2);diff --git a/drivers/net/s2io.h b/drivers/net/s2io.h index 47c36e0..4da9ab8 100644 --- a/drivers/net/s2io.h +++ b/drivers/net/s2io.h@@ -747,7 +747,6 @@ struct ring_info { struct buffAdd **ba; /* per-Ring statistics */ - unsigned long rx_packets; unsigned long rx_bytes; } ____cacheline_aligned; --To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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