From: Jacob Keller Date: Thu, 17 May 2018 08:08:34 +0000 (-0700) Subject: i40e: always return all queue stat strings X-Git-Tag: v5.15~8692^2~173^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b8312365097ca854a03231bd58a284491aaa8ef7;p=platform%2Fkernel%2Flinux-starfive.git i40e: always return all queue stat strings The ethtool API for obtaining device statistics is not intended to allow runtime changes in the number of statistics reported. It may *appear* this way, as there is an ability to request the number of stats using ethtool_get_set_count(). However, it is expected that this must always return the same value for invocations of the same device. If we don't satisfy this contract, and allow the number of stats to change during run time, we could cause invalid memory accesses or report the stat strings incorrectly. This is because the API for obtaining stats is to (1) get the size, (2) get the strings and finally (3) get the stats. Since these are each separate ethtool op commands, it is not possible to maintain consistency by holding the RTNL lock over the whole operation. This results in the potential for a race condition to occur where the size changed between any of the 3 calls. Avoid this issue by requiring that we always return the same value for a given device. We can check any values which remain constant for the life of the device, but must not report different sizes depending on runtime attributes. This patch specifically fixes the queue statistics to always return every queue even if it's not currently in use. Signed-off-by: Jacob Keller Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c index de5dad7..bacb01b 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c +++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c @@ -140,8 +140,12 @@ static const struct i40e_stats i40e_gstrings_stats[] = { I40E_PF_STAT("rx_lpi_count", stats.rx_lpi_count), }; -#define I40E_QUEUE_STATS_LEN(n) \ - (((struct i40e_netdev_priv *)netdev_priv((n)))->vsi->num_queue_pairs \ +/* We use num_tx_queues here as a proxy for the maximum number of queues + * available because we always allocate queues symmetrically. + */ +#define I40E_MAX_NUM_QUEUES(n) ((n)->num_tx_queues) +#define I40E_QUEUE_STATS_LEN(n) \ + (I40E_MAX_NUM_QUEUES(n) \ * 2 /* Tx and Rx together */ \ * (sizeof(struct i40e_queue_stats) / sizeof(u64))) #define I40E_GLOBAL_STATS_LEN ARRAY_SIZE(i40e_gstrings_stats) @@ -1712,11 +1716,19 @@ static void i40e_get_ethtool_stats(struct net_device *netdev, sizeof(u64)) ? *(u64 *)p : *(u32 *)p; } rcu_read_lock(); - for (j = 0; j < vsi->num_queue_pairs; j++) { + for (j = 0; j < I40E_MAX_NUM_QUEUES(netdev) ; j++) { tx_ring = READ_ONCE(vsi->tx_rings[j]); - if (!tx_ring) + if (!tx_ring) { + /* Bump the stat counter to skip these stats, and make + * sure the memory is zero'd + */ + data[i++] = 0; + data[i++] = 0; + data[i++] = 0; + data[i++] = 0; continue; + } /* process Tx ring statistics */ do { @@ -1800,7 +1812,7 @@ static void i40e_get_strings(struct net_device *netdev, u32 stringset, i40e_gstrings_misc_stats[i].stat_string); p += ETH_GSTRING_LEN; } - for (i = 0; i < vsi->num_queue_pairs; i++) { + for (i = 0; i < I40E_MAX_NUM_QUEUES(netdev); i++) { snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_packets", i); p += ETH_GSTRING_LEN; snprintf(p, ETH_GSTRING_LEN, "tx-%d.tx_bytes", i);