mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/net/ethernet/sfc/nic.c
..
..
@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /****************************************************************************
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  * Driver for Solarflare network controllers and boards
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  * Copyright 2005-2006 Fen Systems Ltd.
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  * Copyright 2006-2013 Solarflare Communications Inc.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published
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- * by the Free Software Foundation, incorporated herein by reference.
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  */
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7
 
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 #include <linux/bitops.h>
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..
@@ -23,6 +20,7 @@
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 #include "farch_regs.h"
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 #include "io.h"
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 #include "workarounds.h"
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+#include "mcdi_pcol.h"
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24
 
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 /**************************************************************************
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  *
..
..
@@ -34,8 +32,8 @@
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 int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
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 			 unsigned int len, gfp_t gfp_flags)
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 {
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-	buffer->addr = dma_zalloc_coherent(&efx->pci_dev->dev, len,
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-					   &buffer->dma_addr, gfp_flags);
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+	buffer->addr = dma_alloc_coherent(&efx->pci_dev->dev, len,
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+					  &buffer->dma_addr, gfp_flags);
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 	if (!buffer->addr)
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 		return -ENOMEM;
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 	buffer->len = len;
..
..
@@ -92,6 +90,7 @@
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 				  efx->pci_dev->irq);
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 			goto fail1;
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 		}
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+		efx->irqs_hooked = true;
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 		return 0;
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 	}
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..
..
@@ -131,6 +130,7 @@
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 #endif
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 	}
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+	efx->irqs_hooked = true;
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 	return 0;
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135
 
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  fail2:
..
..
@@ -156,6 +156,8 @@
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 	efx->net_dev->rx_cpu_rmap = NULL;
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 #endif
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+	if (!efx->irqs_hooked)
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+		return;
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 	if (EFX_INT_MODE_USE_MSI(efx)) {
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 		/* Disable MSI/MSI-X interrupts */
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 		efx_for_each_channel(channel, efx)
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@@ -165,6 +167,7 @@
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 		/* Disable legacy interrupt */
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 		free_irq(efx->legacy_irq, efx);
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 	}
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+	efx->irqs_hooked = false;
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 }
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 /* Register dump */
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@@ -474,6 +477,49 @@
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 }
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 /**
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+ * efx_nic_copy_stats - Copy stats from the DMA buffer in to an
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+ *	intermediate buffer. This is used to get a consistent
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+ *	set of stats while the DMA buffer can be written at any time
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+ *	by the NIC.
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+ * @efx: The associated NIC.
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+ * @dest: Destination buffer. Must be the same size as the DMA buffer.
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+ */
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+int efx_nic_copy_stats(struct efx_nic *efx, __le64 *dest)
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+{
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+	__le64 *dma_stats = efx->stats_buffer.addr;
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+	__le64 generation_start, generation_end;
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+	int rc = 0, retry;
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+
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+	if (!dest)
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+		return 0;
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+
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+	if (!dma_stats)
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+		goto return_zeroes;
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+
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+	/* If we're unlucky enough to read statistics during the DMA, wait
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+	 * up to 10ms for it to finish (typically takes <500us)
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+	 */
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+	for (retry = 0; retry < 100; ++retry) {
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+		generation_end = dma_stats[efx->num_mac_stats - 1];
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+		if (generation_end == EFX_MC_STATS_GENERATION_INVALID)
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+			goto return_zeroes;
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+		rmb();
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+		memcpy(dest, dma_stats, efx->num_mac_stats * sizeof(__le64));
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+		rmb();
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+		generation_start = dma_stats[MC_CMD_MAC_GENERATION_START];
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+		if (generation_end == generation_start)
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+			return 0; /* return good data */
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+		udelay(100);
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+	}
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+
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+	rc = -EIO;
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+
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+return_zeroes:
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+	memset(dest, 0, efx->num_mac_stats * sizeof(u64));
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+	return rc;
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+}
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+
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+/**
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  * efx_nic_update_stats - Convert statistics DMA buffer to array of u64
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  * @desc: Array of &struct efx_hw_stat_desc describing the DMA buffer
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  *	layout.  DMA widths of 0, 16, 32 and 64 are supported; where