[PATCH 4/4] net/netvsc: cache device parameters for hot plug events

[Stephen Hemminger]

On Mon, 27 Jan 2025 17:35:06 -0800
longli at linuxonhyperv.com wrote:

> From: Long Li <longli at microsoft.com>
> 
> If a device is hot removed and hot plugged, it needs the same driver
> parameters that are passed to EAL. However, during device removal, all
> EAL driver parameters are freed as part of the cleanup.
> 
> Cache those driver parameters for future hot plug events. Because we don't
> know which device will show up, cache all the PCI driver parameters.
> 
> Signed-off-by: Long Li <longli at microsoft.com>

*Build Failed #1:
OS: OpenAnolis8.9-64
Target: x86_64-native-linuxapp-gcc
FAILED: drivers/libtmp_rte_net_netvsc.a.p/net_netvsc_hn_ethdev.c.o 
gcc -Idrivers/libtmp_rte_net_netvsc.a.p -Idrivers -I../drivers -Idrivers/net/netvsc -I../drivers/net/netvsc -Ilib/ethdev -I../lib/ethdev -I. -I.. -Iconfig -I../config -Ilib/eal/include -I../lib/eal/include -Ilib/eal/linux/include -I../lib/eal/linux/include -Ilib/eal/x86/include -I../lib/eal/x86/include -I../kernel/linux -Ilib/eal/common -I../lib/eal/common -Ilib/eal -I../lib/eal -Ilib/kvargs -I../lib/kvargs -Ilib/log -I../lib/log -Ilib/metrics -I../lib/metrics -Ilib/telemetry -I../lib/telemetry -Ilib/net -I../lib/net -Ilib/mbuf -I../lib/mbuf -Ilib/mempool -I../lib/mempool -Ilib/ring -I../lib/ring -Ilib/meter -I../lib/meter -Idrivers/bus/pci -I../drivers/bus/pci -I../drivers/bus/pci/linux -Ilib/pci -I../lib/pci -Idrivers/bus/vdev -I../drivers/bus/vdev -Idrivers/bus/vmbus -I../drivers/bus/vmbus -I../drivers/bus/vmbus/linux -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Werror -std=c11 -O3 -include rte_config.h -Wcast-qual -Wdeprecated -Wformat -Wformat-nonliteral -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wpointer-arith -Wsign-compare -Wstrict-prototypes -Wundef -Wwrite-strings -Wno-packed-not-aligned -Wno-missing-field-initializers -D_GNU_SOURCE -fPIC -march=native -mrtm -DALLOW_EXPERIMENTAL_API -DALLOW_INTERNAL_API -Wno-format-truncation -DRTE_LOG_DEFAULT_LOGTYPE=pmd.net.netvsc -MD -MQ drivers/libtmp_rte_net_netvsc.a.p/net_netvsc_hn_ethdev.c.o -MF drivers/libtmp_rte_net_netvsc.a.p/net_netvsc_hn_ethdev.c.o.d -o drivers/libtmp_rte_net_netvsc.a.p/net_netvsc_hn_ethdev.c.o -c ../drivers/net/netvsc/hn_ethdev.c
../drivers/net/netvsc/hn_ethdev.c: In function ‘populate_cache_list’:
../drivers/net/netvsc/hn_ethdev.c:1460:40: error: argument to ‘sizeof’ in ‘strncpy’ call is the same expression as the source; did you mean to use the size of the destination? [-Werror=sizeof-pointer-memaccess]
   strncpy(cache->name, da->name, sizeof(da->name));
                                        ^
../drivers/net/netvsc/hn_ethdev.c: In function ‘eth_hn_probe’:
../drivers/net/netvsc/hn_ethdev.c:1502:5: error: ‘ret’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  if (ret)
     ^