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sfc: use kmalloc() to allocate logging buffer

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efx_mcdi_init() allocates a logging buffer for MCDI firmware
communication diagnostics.

This buffer can be allocated with kmalloc() as there's nothing special
about it to go directly to the page allocator.

kmalloc() provides a better API that does not require ugly casts and
kfree() does not need to know the size of the freed object.

Performance difference between kmalloc() and __get_free_pages() is not
measurable as both allocators take an object/page from a per-CPU list for
fast path allocations.

For the slow path the performance is anyway determined by the amount of
reclaim involved rather than by what allocator is used.

Replace use of __get_free_page() with kmalloc() and free_page() with
kfree().

Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Edward Cree <ecree.xilinx@gmail.com>
Link: https://patch.msgid.link/20260701-b4-drivers-ethernet-v1-4-58776615db6e@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Mike Rapoport (Microsoft) 2026-07-01 16:57:21 +03:00 committed by Paolo Abeni
parent 50bfc5eac4
commit e8cfc70720
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/sfc/mcdi.c
View File

@ -7,6 +7,7 @@
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/atomic.h>
#include <linux/slab.h>
#include "net_driver.h"
#include "nic.h"
#include "io.h"
@ -71,7 +72,7 @@ int efx_mcdi_init(struct efx_nic *efx)
mcdi->efx = efx;
#ifdef CONFIG_SFC_MCDI_LOGGING
/* consuming code assumes buffer is page-sized */
mcdi->logging_buffer = (char *)__get_free_page(GFP_KERNEL);
mcdi->logging_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!mcdi->logging_buffer)
goto fail1;
mcdi->logging_enabled = mcdi_logging_default;
@ -112,7 +113,7 @@ int efx_mcdi_init(struct efx_nic *efx)
return 0;
fail2:
#ifdef CONFIG_SFC_MCDI_LOGGING
free_page((unsigned long)mcdi->logging_buffer);
kfree(mcdi->logging_buffer);
fail1:
#endif
kfree(efx->mcdi);
@ -138,7 +139,7 @@ void efx_mcdi_fini(struct efx_nic *efx)
return;
#ifdef CONFIG_SFC_MCDI_LOGGING
free_page((unsigned long)efx->mcdi->iface.logging_buffer);
kfree(efx->mcdi->iface.logging_buffer);
#endif
kfree(efx->mcdi);