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linux-stable/drivers/scsi
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Eric Dumazet 3948b05950 net: introduce a config option to tweak MAX_SKB_FRAGS 
Currently, MAX_SKB_FRAGS value is 17.

For standard tcp sendmsg() traffic, no big deal because tcp_sendmsg()
attempts order-3 allocations, stuffing 32768 bytes per frag.

But with zero copy, we use order-0 pages.

For BIG TCP to show its full potential, we add a config option
to be able to fit up to 45 segments per skb.

This is also needed for BIG TCP rx zerocopy, as zerocopy currently
does not support skbs with frag list.

We have used MAX_SKB_FRAGS=45 value for years at Google before
we deployed 4K MTU, with no adverse effect, other than
a recent issue in mlx4, fixed in commit 26782aad00
("net/mlx4: MLX4_TX_BOUNCE_BUFFER_SIZE depends on MAX_SKB_FRAGS")

Back then, goal was to be able to receive full size (64KB) GRO
packets without the frag_list overhead.

Note that /proc/sys/net/core/max_skb_frags can also be used to limit
the number of fragments TCP can use in tx packets.

By default we keep the old/legacy value of 17 until we get
more coverage for the updated values.

Sizes of struct skb_shared_info on 64bit arches

MAX_SKB_FRAGS | sizeof(struct skb_shared_info):
==============================================
         17     320
         21     320+64  = 384
         25     320+128 = 448
         29     320+192 = 512
         33     320+256 = 576
         37     320+320 = 640
         41     320+384 = 704
         45     320+448 = 768

This inflation might cause problems for drivers assuming they could pack
both the incoming packet (for MTU=1500) and skb_shared_info in half a page,
using build_skb().

v3: fix build error when CONFIG_NET=n
v2: fix two build errors assuming MAX_SKB_FRAGS was "unsigned long"

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Link: https://lore.kernel.org/r/20230323162842.1935061-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2023-03-27 19:29:22 -07:00
..
aacraid scsi: aacraid: Allocate cmd_priv with scsicmd 2023-02-08 18:49:48 -05:00
aic7xxx scsi: aic79xx: Use __ro_after_init explicitly 2022-09-15 22:01:24 -04:00
aic94xx scsi: aic94xx: Add missing check for dma_map_single() 2023-02-08 19:12:25 -05:00
arcmsr
arm scsi: arm: Move the SCSI pointer to private command data 2022-02-22 21:11:03 -05:00
be2iscsi scsi: iscsi: Remove iscsi_get_task back_lock requirement 2022-06-21 21:19:23 -04:00
bfa scsi: bfa: Replace one-element array with flexible-array member 2022-11-17 18:15:45 +00:00
bnx2fc scsi: bnx2fc: Avoid using get_cpu() in bnx2fc_cmd_alloc() 2022-05-16 21:26:50 -04:00
bnx2i scsi: iscsi: Fix session removal on shutdown 2022-06-21 21:14:54 -04:00
csiostor scsi: csiostor: Remove unused variable 'n' 2022-11-08 03:40:54 +00:00
cxgbi net: introduce a config option to tweak MAX_SKB_FRAGS 2023-03-27 19:29:22 -07:00
cxlflash - Daniel Verkamp has contributed a memfd series ("mm/memfd: add 2023-02-23 17:09:35 -08:00
device_handler scsi: scsi_dh_alua: Fix memleak for 'qdata' in alua_activate() 2023-03-16 23:02:23 -04:00
elx scsi: elx: libefc_sli: Use "/*" for non-kernel-doc comment 2023-01-23 20:53:43 -05:00
esas2r scsi: esas2r: Introduce scsi_template_proc_dir() 2022-10-18 03:17:09 +00:00
fcoe SCSI misc on 20221213 2022-12-14 08:58:51 -08:00
fnic SCSI misc on 20220804 2022-08-04 19:47:37 -07:00
hisi_sas scsi: hisi_sas: Check devm_add_action() return value 2023-03-06 18:33:12 -05:00
ibmvscsi scsi: ibmvfc: Avoid path failures during live migration 2022-11-07 18:57:39 +00:00
ibmvscsi_tgt scsi: ibmvscsi_tgt: Fix repeated words in comment 2022-09-15 22:30:26 -04:00
isci scsi: isci: Fix typo in comment 2022-05-23 23:24:10 -04:00
libfc scsi: libfc: Include the correct header 2022-12-01 03:03:36 +00:00
libsas SCSI misc on 20230222 2023-02-22 13:41:41 -08:00
lpfc SCSI fixes on 20230310 2023-03-10 20:45:53 -08:00
megaraid scsi: megaraid_sas: Driver version update to 07.725.01.00-rc1 2023-03-06 18:33:13 -05:00
mpi3mr scsi: mpi3mr: Fix expander node leak in mpi3mr_remove() 2023-03-07 21:17:23 -05:00
mpt3sas scsi: mpt3sas: Fix NULL pointer access in mpt3sas_transport_port_add() 2023-03-07 21:02:09 -05:00
mvsas scsi: mvsas: Use sas_task_find_rq() for tagging 2022-10-22 03:02:52 +00:00
pcmcia scsi: pcmcia: nsp_cs: Remove unused variable i 2022-10-27 02:15:46 +00:00
pm8001 scsi: pm8001: Use sysfs_emit() in show function callbacks 2023-01-11 21:53:34 -05:00
qedf scsi: qedf: Remove set but unused variable 'page' 2022-10-22 03:09:45 +00:00
qedi scsi: qedi: Remove unneeded version.h include 2023-02-21 22:00:51 -05:00
qla2xxx scsi: qla2xxx: Synchronize the IOCB count to be in order 2023-03-16 22:59:19 -04:00
qla4xxx scsi: core: Change the return type of .eh_timed_out() 2022-10-22 03:25:59 +00:00
smartpqi scsi: smartpqi: Replace one-element array with flexible-array member 2023-02-08 19:03:43 -05:00
snic scsi: snic: Fix memory leak with using debugfs_lookup() 2023-02-08 18:49:59 -05:00
sym53c8xx_2 scsi: sym53c8xx_2: Remove redundant "with" 2022-06-21 21:41:19 -04:00
.gitignore
3w-9xxx.c scsi: 3w-9xxx: Avoid disabling device if failing to enable it 2022-09-06 22:22:24 -04:00
3w-9xxx.h
3w-sas.c scsi: 3w-sas: Replace 1-element arrays with flexible array members 2023-01-12 00:09:52 -05:00
3w-sas.h scsi: 3w-sas: Replace 1-element arrays with flexible array members 2023-01-12 00:09:52 -05:00
3w-xxxx.c scsi: 3w-xxxx: Replace one-element array with flexible-array member 2022-09-25 13:06:00 -04:00
3w-xxxx.h scsi: 3w-xxxx: Replace one-element array with flexible-array member 2022-09-25 13:06:00 -04:00
53c700.c scsi: 53c700: Stop clearing SCSI pointer fields 2022-02-22 21:11:03 -05:00
53c700.h
53c700.scr
53c700_d.h_shipped
a100u2w.c
a100u2w.h
a2091.c scsi: a2091: Convert m68k WD33C93 drivers to DMA API 2022-07-07 17:01:22 -04:00
a2091.h
a3000.c scsi: a3000: Convert m68k WD33C93 drivers to DMA API 2022-07-07 17:01:22 -04:00
a3000.h
a4000t.c
advansys.c scsi: advansys: Move the SCSI pointer to private command data 2022-02-22 21:11:03 -05:00
aha152x.c scsi: aha152x: Stop using struct scsi_pointer 2022-03-29 23:42:18 -04:00
aha152x.h
aha1542.c scsi: aha1542: Remove unneeded semicolon 2022-04-25 23:25:11 -04:00
aha1542.h
aha1740.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
aha1740.h
am53c974.c
atari_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
atp870u.c
atp870u.h
BusLogic.c scsi: BusLogic: Remove variable 'adapter_count' 2022-11-08 03:01:12 +00:00
BusLogic.h
bvme6000_scsi.c
ch.c scsi: ch: Convert to scsi_execute_cmd() 2023-01-13 21:34:08 -05:00
constants.c
dc395x.c scsi: dc395x: Fix a missing check on list iterator 2022-04-26 08:51:56 -04:00
dc395x.h
dmx3191d.c scsi: NCR5380: Remove the NCR5380_CMD_SIZE macro 2022-02-22 21:11:03 -05:00
esp_scsi.c scsi: esp_scsi: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
esp_scsi.h scsi: esp_scsi: Stop using the SCSI pointer 2022-02-22 21:11:04 -05:00
fdomain.c scsi: fdomain: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
fdomain.h
fdomain_isa.c
fdomain_pci.c
FlashPoint.c scsi: FlashPoint: Remove redundant variable bm_int_st 2022-08-01 19:52:03 -04:00
g_NCR5380.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
gvp11.c scsi: gvp11.c: Fix DMA mask calculation error 2022-07-13 23:18:26 -04:00
gvp11.h
hosts.c scsi: core: Fix a procfs host directory removal regression 2023-03-09 21:07:21 -05:00
hpsa.c scsi: hpsa: Fix allocation size for scsi_host_alloc() 2023-01-18 18:59:46 -05:00
hpsa.h
hpsa_cmd.h
hptiop.c scsi: hptiop: Use struct_size() helper in code related to struct hpt_iop_request_scsi_command 2022-09-25 13:02:23 -04:00
hptiop.h scsi: hptiop: Replace one-element array with flexible-array member in struct hpt_iop_request_ioctl_command() 2022-09-25 13:04:17 -04:00
imm.c scsi: imm: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
imm.h scsi: imm: Move the SCSI pointer to private command data 2022-02-22 21:11:04 -05:00
initio.c scsi: initio: Remove redundant assignment to pointer scb 2022-08-31 23:39:57 -04:00
initio.h scsi: initio: Stop using the SCSI pointer 2022-02-22 21:11:05 -05:00
ipr.c SCSI misc on 20230303 2023-03-03 14:41:50 -08:00
ipr.h
ips.c scsi: ips: Replace kmap_atomic() with kmap_local_page() 2023-01-18 18:41:12 -05:00
ips.h
iscsi_boot_sysfs.c
iscsi_tcp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-01-27 22:56:18 -08:00
iscsi_tcp.h scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername() 2022-09-25 14:27:47 -04:00
jazz_esp.c
Kconfig scsi: core: Make SCSI_MOD depend on BLOCK for cleaner .config files 2022-09-25 12:46:59 -04:00
lasi700.c
libiscsi.c scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress 2023-01-18 19:14:56 -05:00
libiscsi_tcp.c scsi: iscsi: Remove iscsi_get_task back_lock requirement 2022-06-21 21:19:23 -04:00
mac53c94.c scsi: mac53c94: Fix warning comparing pointer to 0 2022-04-25 23:23:05 -04:00
mac53c94.h scsi: mac53c94: Stop using struct scsi_pointer 2022-02-27 21:35:30 -05:00
mac_esp.c
mac_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
Makefile scsi: dpt_i2o: Remove obsolete driver 2022-06-27 22:56:21 -04:00
megaraid.c scsi: megaraid: Fix error check return value of register_chrdev() 2022-04-26 09:02:44 -04:00
megaraid.h scsi: megaraid: Stop using the SCSI pointer 2022-02-22 21:11:05 -05:00
mesh.c powerpc/powermac: Remove empty function note_scsi_host() 2022-06-26 10:29:44 +10:00
mesh.h scsi: mesh: Stop using struct scsi_pointer 2022-02-27 21:34:02 -05:00
mvme16x_scsi.c
mvme147.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
mvme147.h
mvumi.c scsi: mvumi: Replace 1-element arrays with flexible array members 2023-01-12 00:11:11 -05:00
mvumi.h scsi: mvumi: Replace 1-element arrays with flexible array members 2023-01-12 00:11:11 -05:00
myrb.c scsi: myrb: Fix up null pointer access on myrb_cleanup() 2022-05-23 23:24:10 -04:00
myrb.h
myrs.c scsi: myrs: Fix crash in error case 2022-01-25 00:09:41 -05:00
myrs.h
ncr53c8xx.c scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
ncr53c8xx.h scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
NCR5380.c scsi: NCR5380: Fix repeated words in comment 2022-11-08 02:57:01 +00:00
NCR5380.h scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
nsp32.c scsi: nsp32: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
nsp32.h scsi: nsp32: Stop using the SCSI pointer 2022-02-22 21:11:06 -05:00
nsp32_debug.c
nsp32_io.h
pmcraid.c scsi: pmcraid: Fix missing resource cleanup in error case 2022-06-07 22:05:14 -04:00
pmcraid.h scsi: pmcraid: Remove the PMCRAID_PASSTHROUGH_IOCTL ioctl implementation 2022-03-29 23:32:26 -04:00
ppa.c scsi: ppa: Move the SCSI pointer to private command data 2022-02-22 21:11:06 -05:00
ppa.h
ps3rom.c
qla1280.c scsi: qla1280: Remove redundant variable 2022-05-19 20:26:21 -04:00
qla1280.h scsi: qla1280: Move the SCSI pointer to private command data 2022-02-22 21:11:06 -05:00
qlogicfas.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
qlogicfas408.c scsi: Remove drivers/scsi/scsi.h 2022-02-22 21:11:02 -05:00
qlogicfas408.h
qlogicpti.c scsi: qlogicpti: Fix dma_map_sg() check 2022-09-06 22:14:14 -04:00
qlogicpti.h
raid_class.c
script_asm.pl
scsi.c scsi: core: Add BLIST_NO_VPD_SIZE for some VDASD 2023-03-09 20:57:58 -05:00
scsi_bsg.c scsi: bsg: Drop needless assignment in scsi_bsg_sg_io_fn() 2022-03-15 14:05:02 -04:00
scsi_common.c
scsi_debug.c Merge branch '6.2/scsi-queue' into 6.2/scsi-fixes 2022-12-30 16:29:34 +00:00
scsi_debugfs.c scsi: core: Remove struct scsi_request 2022-03-01 22:21:50 -05:00
scsi_debugfs.h
scsi_devinfo.c scsi: core: Add BLIST_SKIP_VPD_PAGES for SKhynix H28U74301AMR 2023-03-16 22:54:43 -04:00
scsi_dh.c
scsi_error.c Merge branch '6.2/scsi-queue' into 6.2/scsi-fixes 2022-12-30 16:29:34 +00:00
scsi_ioctl.c scsi: core: Convert to scsi_execute_cmd() 2023-01-13 21:34:09 -05:00
scsi_lib.c scsi: core: Extend struct scsi_exec_args 2023-02-21 22:00:51 -05:00
scsi_lib_dma.c
scsi_logging.c scsi: core: scsi_logging: Fix a BUG 2022-03-29 23:29:19 -04:00
scsi_logging.h
scsi_netlink.c
scsi_pm.c scsi: block: pm: Always set request queue runtime active in blk_post_runtime_resume() 2021-12-22 23:38:29 -05:00
scsi_priv.h scsi: core: Introduce a new list for SCSI proc directory entries 2022-10-18 03:17:09 +00:00
scsi_proc.c scsi: core: Introduce a new list for SCSI proc directory entries 2022-10-18 03:17:09 +00:00
scsi_sas_internal.h
scsi_scan.c scsi: core: Add BLIST_NO_VPD_SIZE for some VDASD 2023-03-09 20:57:58 -05:00
scsi_sysctl.c
scsi_sysfs.c Driver core changes for 6.3-rc1 2023-02-24 12:58:55 -08:00
scsi_trace.c
scsi_transport_api.h
scsi_transport_fc.c scsi: scsi_transport_fc: Add an additional flag to fc_host_fpin_rcv() 2023-02-21 18:03:29 -05:00
scsi_transport_iscsi.c Merge branch '6.2/scsi-queue' into 6.2/scsi-fixes 2022-12-30 16:29:34 +00:00
scsi_transport_sas.c scsi: scsi_transport_sas: Fix error handling in sas_phy_add() 2022-11-08 01:52:52 +00:00
scsi_transport_spi.c scsi: spi: Convert to scsi_execute_cmd() 2023-01-13 21:34:09 -05:00
scsi_transport_srp.c scsi: core: Change the return type of .eh_timed_out() 2022-10-22 03:25:59 +00:00
scsicam.c scsicam: Fix use of page cache 2022-05-08 14:28:18 -04:00
sd.c scsi: sd: Fix wrong zone_write_granularity value during revalidate 2023-03-06 18:33:13 -05:00
sd.h scsi: sd: Revert "Rework asynchronous resume support" 2022-08-22 22:45:25 -04:00
sd_dif.c scsi: sd: Update DIX config every time sd_revalidate_disk() is called 2023-02-21 22:00:32 -05:00
sd_trace.h scsi: sd: sd_zbc: Trace zone append emulation 2022-12-01 03:13:55 +00:00
sd_zbc.c scsi: sd: Fix wrong zone_write_granularity value during revalidate 2023-03-06 18:33:13 -05:00
sense_codes.h
ses.c scsi: ses: Don't attach if enclosure has no components 2023-02-21 17:44:06 -05:00
sg.c mm: replace vma->vm_flags direct modifications with modifier calls 2023-02-09 16:51:39 -08:00
sgiwd93.c scsi: wd33c93: Move the SCSI pointer to private command data 2022-02-22 21:11:07 -05:00
sim710.c
sni_53c710.c
sr.c scsi: sr: Convert to scsi_execute_cmd() 2023-01-13 21:34:09 -05:00
sr.h sr: implement ->free_disk to simplify refcounting 2022-03-08 19:40:01 -07:00
sr_ioctl.c scsi: sr: Convert to scsi_execute_cmd() 2023-01-13 21:34:09 -05:00
sr_vendor.c scsi: sr: Don't use GFP_DMA 2021-12-22 23:41:13 -05:00
st.c SCSI misc on 20221007 2022-10-07 12:33:18 -07:00
st.h scsi: don't use disk->private_data to find the scsi_driver 2022-03-08 19:40:00 -07:00
st_options.h
stex.c scsi: stex: Properly zero out the passthrough command structure 2022-09-25 14:15:03 -04:00
storvsc_drv.c scsi: storvsc: Handle BlockSize change in Hyper-V VHD/VHDX file 2023-03-06 18:33:13 -05:00
sun3_scsi.c scsi: NCR5380: Add SCp members to struct NCR5380_cmd 2022-02-22 21:11:03 -05:00
sun3_scsi_vme.c
sun3x_esp.c
sun_esp.c
virtio_scsi.c virtio,vhost,vdpa: features, fixes 2023-02-25 11:48:02 -08:00
vmw_pvscsi.c scsi: vmw_pvscsi: No need to clear memory after a dma_alloc_coherent() call 2022-04-06 23:01:54 -04:00
vmw_pvscsi.h scsi: vmw_pvscsi: Expand vcpuHint to 16 bits 2022-06-07 21:30:56 -04:00
wd33c93.c scsi: wd33c93: Remove dead code related to the long-gone config WD33C93_PIO 2022-09-25 13:29:53 -04:00
wd33c93.h scsi: wd33c93: Remove dead code related to the long-gone config WD33C93_PIO 2022-09-25 13:29:53 -04:00
wd719x.c scsi: wd719x: Return proper error code when dma_set_mask() fails 2022-03-01 23:56:28 -05:00
wd719x.h scsi: wd719x: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
xen-scsifront.c xen: make remove callback of xen driver void returned 2022-12-15 16:06:10 +01:00
zalon.c scsi: zalon: Stop using the SCSI pointer 2022-02-22 21:11:07 -05:00
zorro7xx.c scsi: zorro7xx: Fix a resource leak in zorro7xx_remove_one() 2022-03-30 00:05:42 -04:00
zorro_esp.c