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5febf6d6ae
The current codebase makes use of the zero-length array language extension
to the C90 standard, but the preferred mechanism to declare variable-length
types such as these ones is a flexible array member[1][2], introduced in
C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning in
case the flexible array does not occur last in the structure, which will
help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by this
change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200224161406.GA21454@embeddedor
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
271 lines
7.9 KiB
C
271 lines
7.9 KiB
C
/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _VNIC_DEVCMD_H_
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#define _VNIC_DEVCMD_H_
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#define _CMD_NBITS 14
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#define _CMD_VTYPEBITS 10
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#define _CMD_FLAGSBITS 6
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#define _CMD_DIRBITS 2
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#define _CMD_NMASK ((1 << _CMD_NBITS)-1)
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#define _CMD_VTYPEMASK ((1 << _CMD_VTYPEBITS)-1)
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#define _CMD_FLAGSMASK ((1 << _CMD_FLAGSBITS)-1)
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#define _CMD_DIRMASK ((1 << _CMD_DIRBITS)-1)
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#define _CMD_NSHIFT 0
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#define _CMD_VTYPESHIFT (_CMD_NSHIFT+_CMD_NBITS)
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#define _CMD_FLAGSSHIFT (_CMD_VTYPESHIFT+_CMD_VTYPEBITS)
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#define _CMD_DIRSHIFT (_CMD_FLAGSSHIFT+_CMD_FLAGSBITS)
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/*
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* Direction bits (from host perspective).
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*/
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#define _CMD_DIR_NONE 0U
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#define _CMD_DIR_WRITE 1U
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#define _CMD_DIR_READ 2U
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#define _CMD_DIR_RW (_CMD_DIR_WRITE | _CMD_DIR_READ)
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/*
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* Flag bits.
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*/
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#define _CMD_FLAGS_NONE 0U
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#define _CMD_FLAGS_NOWAIT 1U
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/*
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* vNIC type bits.
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*/
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#define _CMD_VTYPE_NONE 0U
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#define _CMD_VTYPE_ENET 1U
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#define _CMD_VTYPE_FC 2U
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#define _CMD_VTYPE_SCSI 4U
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#define _CMD_VTYPE_ALL (_CMD_VTYPE_ENET | _CMD_VTYPE_FC | _CMD_VTYPE_SCSI)
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/*
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* Used to create cmds..
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*/
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#define _CMDCF(dir, flags, vtype, nr) \
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(((dir) << _CMD_DIRSHIFT) | \
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((flags) << _CMD_FLAGSSHIFT) | \
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((vtype) << _CMD_VTYPESHIFT) | \
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((nr) << _CMD_NSHIFT))
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#define _CMDC(dir, vtype, nr) _CMDCF(dir, 0, vtype, nr)
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#define _CMDCNW(dir, vtype, nr) _CMDCF(dir, _CMD_FLAGS_NOWAIT, vtype, nr)
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/*
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* Used to decode cmds..
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*/
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#define _CMD_DIR(cmd) (((cmd) >> _CMD_DIRSHIFT) & _CMD_DIRMASK)
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#define _CMD_FLAGS(cmd) (((cmd) >> _CMD_FLAGSSHIFT) & _CMD_FLAGSMASK)
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#define _CMD_VTYPE(cmd) (((cmd) >> _CMD_VTYPESHIFT) & _CMD_VTYPEMASK)
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#define _CMD_N(cmd) (((cmd) >> _CMD_NSHIFT) & _CMD_NMASK)
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enum vnic_devcmd_cmd {
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CMD_NONE = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_NONE, 0),
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/* mcpu fw info in mem: (u64)a0=paddr to struct vnic_devcmd_fw_info */
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CMD_MCPU_FW_INFO = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 1),
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/* dev-specific block member:
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* in: (u16)a0=offset,(u8)a1=size
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* out: a0=value */
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CMD_DEV_SPEC = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 2),
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/* stats clear */
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CMD_STATS_CLEAR = _CMDCNW(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 3),
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/* stats dump in mem: (u64)a0=paddr to stats area,
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* (u16)a1=sizeof stats area */
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CMD_STATS_DUMP = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 4),
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/* nic_cfg in (u32)a0 */
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CMD_NIC_CFG = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 16),
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/* set struct vnic_devcmd_notify buffer in mem:
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* in:
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* (u64)a0=paddr to notify (set paddr=0 to unset)
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* (u32)a1 & 0x00000000ffffffff=sizeof(struct vnic_devcmd_notify)
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* (u16)a1 & 0x0000ffff00000000=intr num (-1 for no intr)
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* out:
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* (u32)a1 = effective size
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*/
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CMD_NOTIFY = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 21),
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/* initiate open sequence (u32)a0=flags (see CMD_OPENF_*) */
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CMD_OPEN = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 23),
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/* open status:
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* out: a0=0 open complete, a0=1 open in progress */
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CMD_OPEN_STATUS = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 24),
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/* close vnic */
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CMD_CLOSE = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 25),
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/* initialize virtual link: (u32)a0=flags (see CMD_INITF_*) */
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CMD_INIT = _CMDCNW(_CMD_DIR_READ, _CMD_VTYPE_ALL, 26),
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/* enable virtual link */
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CMD_ENABLE = _CMDCNW(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 28),
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/* enable virtual link, waiting variant. */
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CMD_ENABLE_WAIT = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 28),
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/* disable virtual link */
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CMD_DISABLE = _CMDC(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 29),
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/* stats dump all vnics on uplink in mem: (u64)a0=paddr (u32)a1=uif */
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CMD_STATS_DUMP_ALL = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 30),
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/* init status:
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* out: a0=0 init complete, a0=1 init in progress
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* if a0=0, a1=errno */
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CMD_INIT_STATUS = _CMDC(_CMD_DIR_READ, _CMD_VTYPE_ALL, 31),
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/* undo initialize of virtual link */
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CMD_DEINIT = _CMDCNW(_CMD_DIR_NONE, _CMD_VTYPE_ALL, 34),
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/* check fw capability of a cmd:
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* in: (u32)a0=cmd
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* out: (u32)a0=errno, 0:valid cmd, a1=supported VNIC_STF_* bits */
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CMD_CAPABILITY = _CMDC(_CMD_DIR_RW, _CMD_VTYPE_ALL, 36),
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/*
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* Initialization for the devcmd2 interface.
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* in: (u64) a0=host result buffer physical address
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* in: (u16) a1=number of entries in result buffer
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*/
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CMD_INITIALIZE_DEVCMD2 = _CMDC(_CMD_DIR_WRITE, _CMD_VTYPE_ALL, 57)
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};
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/* flags for CMD_OPEN */
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#define CMD_OPENF_OPROM 0x1 /* open coming from option rom */
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/* flags for CMD_INIT */
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#define CMD_INITF_DEFAULT_MAC 0x1 /* init with default mac addr */
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/* flags for CMD_PACKET_FILTER */
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#define CMD_PFILTER_DIRECTED 0x01
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#define CMD_PFILTER_MULTICAST 0x02
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#define CMD_PFILTER_BROADCAST 0x04
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#define CMD_PFILTER_PROMISCUOUS 0x08
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#define CMD_PFILTER_ALL_MULTICAST 0x10
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enum vnic_devcmd_status {
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STAT_NONE = 0,
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STAT_BUSY = 1 << 0, /* cmd in progress */
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STAT_ERROR = 1 << 1, /* last cmd caused error (code in a0) */
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};
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enum vnic_devcmd_error {
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ERR_SUCCESS = 0,
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ERR_EINVAL = 1,
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ERR_EFAULT = 2,
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ERR_EPERM = 3,
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ERR_EBUSY = 4,
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ERR_ECMDUNKNOWN = 5,
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ERR_EBADSTATE = 6,
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ERR_ENOMEM = 7,
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ERR_ETIMEDOUT = 8,
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ERR_ELINKDOWN = 9,
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};
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struct vnic_devcmd_fw_info {
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char fw_version[32];
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char fw_build[32];
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char hw_version[32];
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char hw_serial_number[32];
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};
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struct vnic_devcmd_notify {
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u32 csum; /* checksum over following words */
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u32 link_state; /* link up == 1 */
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u32 port_speed; /* effective port speed (rate limit) */
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u32 mtu; /* MTU */
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u32 msglvl; /* requested driver msg lvl */
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u32 uif; /* uplink interface */
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u32 status; /* status bits (see VNIC_STF_*) */
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u32 error; /* error code (see ERR_*) for first ERR */
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u32 link_down_cnt; /* running count of link down transitions */
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};
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#define VNIC_STF_FATAL_ERR 0x0001 /* fatal fw error */
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struct vnic_devcmd_provinfo {
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u8 oui[3];
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u8 type;
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u8 data[];
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};
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/*
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* Writing cmd register causes STAT_BUSY to get set in status register.
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* When cmd completes, STAT_BUSY will be cleared.
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*
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* If cmd completed successfully STAT_ERROR will be clear
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* and args registers contain cmd-specific results.
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*
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* If cmd error, STAT_ERROR will be set and args[0] contains error code.
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*
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* status register is read-only. While STAT_BUSY is set,
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* all other register contents are read-only.
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*/
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/* Make sizeof(vnic_devcmd) a power-of-2 for I/O BAR. */
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#define VNIC_DEVCMD_NARGS 15
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struct vnic_devcmd {
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u32 status; /* RO */
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u32 cmd; /* RW */
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u64 args[VNIC_DEVCMD_NARGS]; /* RW cmd args (little-endian) */
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};
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/*
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* Version 2 of the interface.
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*
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* Some things are carried over, notably the vnic_devcmd_cmd enum.
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*/
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/*
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* Flags for vnic_devcmd2.flags
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*/
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#define DEVCMD2_FNORESULT 0x1 /* Don't copy result to host */
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#define VNIC_DEVCMD2_NARGS VNIC_DEVCMD_NARGS
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struct vnic_devcmd2 {
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u16 pad;
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u16 flags;
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u32 cmd; /* same command #defines as original */
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u64 args[VNIC_DEVCMD2_NARGS];
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};
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#define VNIC_DEVCMD2_NRESULTS VNIC_DEVCMD_NARGS
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struct devcmd2_result {
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u64 results[VNIC_DEVCMD2_NRESULTS];
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u32 pad;
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u16 completed_index; /* into copy WQ */
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u8 error; /* same error codes as original */
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u8 color; /* 0 or 1 as with completion queues */
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};
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#define DEVCMD2_RING_SIZE 32
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#define DEVCMD2_DESC_SIZE 128
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#define DEVCMD2_RESULTS_SIZE_MAX ((1 << 16) - 1)
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#endif /* _VNIC_DEVCMD_H_ */
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