ixgbe: Add FCoE DDP allocation failure counters to ethtool stats.

Add 2 new counters to ethtool:
	1. Count DDP allocation failure since we max the number of buffers
		allowed in one DDP context.
	2. Count DDP allocation failure since we max the number of buffers
		allowed in one DDP context when we alloc an extra buffer.

Signed-off-by: Amir Hanania <amir.hanania@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c

@@ -113,6 +113,8 @@ static struct ixgbe_stats ixgbe_gstrings_stats[] = {
 	{"rx_fcoe_dropped", IXGBE_STAT(stats.fcoerpdc)},
 	{"rx_fcoe_packets", IXGBE_STAT(stats.fcoeprc)},
 	{"rx_fcoe_dwords", IXGBE_STAT(stats.fcoedwrc)},
+	{"fcoe_noddp", IXGBE_STAT(stats.fcoe_noddp)},
+	{"fcoe_noddp_ext_buff", IXGBE_STAT(stats.fcoe_noddp_ext_buff)},
 	{"tx_fcoe_packets", IXGBE_STAT(stats.fcoeptc)},
 	{"tx_fcoe_dwords", IXGBE_STAT(stats.fcoedwtc)},
 #endif /* IXGBE_FCOE */

drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c

@@ -145,6 +145,7 @@ static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 	u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
 	dma_addr_t addr = 0;
 	struct pci_pool *pool;
+	unsigned int cpu;
 
 	if (!netdev || !sgl)
 		return 0;
@@ -182,7 +183,8 @@ static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 	}
 
 	/* alloc the udl from per cpu ddp pool */
-	pool = *per_cpu_ptr(fcoe->pool, get_cpu());
+	cpu = get_cpu();
+	pool = *per_cpu_ptr(fcoe->pool, cpu);
 	ddp->udl = pci_pool_alloc(pool, GFP_ATOMIC, &ddp->udp);
 	if (!ddp->udl) {
 		e_err(drv, "failed allocated ddp context\n");
@@ -199,9 +201,7 @@ static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 		while (len) {
 			/* max number of buffers allowed in one DDP context */
 			if (j >= IXGBE_BUFFCNT_MAX) {
-				e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
-				      "not enough descriptors\n",
-				      xid, i, j, dmacount, (u64)addr);
+				*per_cpu_ptr(fcoe->pcpu_noddp, cpu) += 1;
 				goto out_noddp_free;
 			}
 
@@ -241,12 +241,7 @@ static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 	 */
 	if (lastsize == bufflen) {
 		if (j >= IXGBE_BUFFCNT_MAX) {
-			printk_once("Will NOT use DDP since there are not "
-				    "enough user buffers. We need an  extra "
-				    "buffer because lastsize is bufflen. "
-				    "xid=%x:%d,%d,%d:addr=%llx\n",
-				    xid, i, j, dmacount, (u64)addr);
-
+			*per_cpu_ptr(fcoe->pcpu_noddp_ext_buff, cpu) += 1;
 			goto out_noddp_free;
 		}
 
@@ -600,6 +595,7 @@ void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 	struct ixgbe_hw *hw = &adapter->hw;
 	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 	struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
+	unsigned int cpu;
 
 	if (!fcoe->pool) {
 		spin_lock_init(&fcoe->lock);
@@ -627,6 +623,24 @@ void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 			e_err(drv, "failed to map extra DDP buffer\n");
 			goto out_extra_ddp_buffer;
 		}
+
+		/* Alloc per cpu mem to count the ddp alloc failure number */
+		fcoe->pcpu_noddp = alloc_percpu(u64);
+		if (!fcoe->pcpu_noddp) {
+			e_err(drv, "failed to alloc noddp counter\n");
+			goto out_pcpu_noddp_alloc_fail;
+		}
+
+		fcoe->pcpu_noddp_ext_buff = alloc_percpu(u64);
+		if (!fcoe->pcpu_noddp_ext_buff) {
+			e_err(drv, "failed to alloc noddp extra buff cnt\n");
+			goto out_pcpu_noddp_extra_buff_alloc_fail;
+		}
+
+		for_each_possible_cpu(cpu) {
+			*per_cpu_ptr(fcoe->pcpu_noddp, cpu) = 0;
+			*per_cpu_ptr(fcoe->pcpu_noddp_ext_buff, cpu) = 0;
+		}
 	}
 
 	/* Enable L2 eth type filter for FCoE */
@@ -664,7 +678,13 @@ void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 	IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, IXGBE_FCRXCTRL_FCCRCBO |
 			(FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 	return;
-
+out_pcpu_noddp_extra_buff_alloc_fail:
+	free_percpu(fcoe->pcpu_noddp);
+out_pcpu_noddp_alloc_fail:
+	dma_unmap_single(&adapter->pdev->dev,
+			 fcoe->extra_ddp_buffer_dma,
+			 IXGBE_FCBUFF_MIN,
+			 DMA_FROM_DEVICE);
 out_extra_ddp_buffer:
 	kfree(fcoe->extra_ddp_buffer);
 out_ddp_pools:
@@ -693,6 +713,8 @@ void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
 			 fcoe->extra_ddp_buffer_dma,
 			 IXGBE_FCBUFF_MIN,
 			 DMA_FROM_DEVICE);
+	free_percpu(fcoe->pcpu_noddp);
+	free_percpu(fcoe->pcpu_noddp_ext_buff);
 	kfree(fcoe->extra_ddp_buffer);
 	ixgbe_fcoe_ddp_pools_free(fcoe);
 }

drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.h

@@ -73,6 +73,8 @@ struct ixgbe_fcoe {
 	unsigned char *extra_ddp_buffer;
 	dma_addr_t extra_ddp_buffer_dma;
 	unsigned long mode;
+	u64 __percpu *pcpu_noddp;
+	u64 __percpu *pcpu_noddp_ext_buff;
 #ifdef CONFIG_IXGBE_DCB
 	u8 up;
 #endif

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

@@ -5552,6 +5552,11 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
 	u64 non_eop_descs = 0, restart_queue = 0, tx_busy = 0;
 	u64 alloc_rx_page_failed = 0, alloc_rx_buff_failed = 0;
 	u64 bytes = 0, packets = 0;
+#ifdef IXGBE_FCOE
+	struct ixgbe_fcoe *fcoe = &adapter->fcoe;
+	unsigned int cpu;
+	u64 fcoe_noddp_counts_sum = 0, fcoe_noddp_ext_buff_counts_sum = 0;
+#endif /* IXGBE_FCOE */
 
 	if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 	    test_bit(__IXGBE_RESETTING, &adapter->state))
@@ -5679,6 +5684,18 @@ void ixgbe_update_stats(struct ixgbe_adapter *adapter)
 		hwstats->fcoeptc += IXGBE_READ_REG(hw, IXGBE_FCOEPTC);
 		hwstats->fcoedwrc += IXGBE_READ_REG(hw, IXGBE_FCOEDWRC);
 		hwstats->fcoedwtc += IXGBE_READ_REG(hw, IXGBE_FCOEDWTC);
+		/* Add up per cpu counters for total ddp aloc fail */
+		if (fcoe->pcpu_noddp && fcoe->pcpu_noddp_ext_buff) {
+			for_each_possible_cpu(cpu) {
+				fcoe_noddp_counts_sum +=
+					*per_cpu_ptr(fcoe->pcpu_noddp, cpu);
+				fcoe_noddp_ext_buff_counts_sum +=
+					*per_cpu_ptr(fcoe->
+						pcpu_noddp_ext_buff, cpu);
+			}
+		}
+		hwstats->fcoe_noddp = fcoe_noddp_counts_sum;
+		hwstats->fcoe_noddp_ext_buff = fcoe_noddp_ext_buff_counts_sum;
 #endif /* IXGBE_FCOE */
 		break;
 	default:

drivers/net/ethernet/intel/ixgbe/ixgbe_type.h

@@ -2682,6 +2682,8 @@ struct ixgbe_hw_stats {
 	u64 fcoeptc;
 	u64 fcoedwrc;
 	u64 fcoedwtc;
+	u64 fcoe_noddp;
+	u64 fcoe_noddp_ext_buff;
 	u64 b2ospc;
 	u64 b2ogprc;
 	u64 o2bgptc;