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sfc: Refactor efx_mcdi_rpc_start() and efx_mcdi_copyin()

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Preparation for asynchronous MCDI requests.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2013-08-22 22:06:09 +01:00
parent 38589cdcd0
commit 2f4bcdcca7
1 changed files with 30 additions and 19 deletions
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49
drivers/net/ethernet/sfc/mcdi.c
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@ -70,8 +70,8 @@ void efx_mcdi_fini(struct efx_nic *efx)
kfree(efx->mcdi);
}
static void efx_mcdi_copyin(struct efx_nic *efx, unsigned cmd,
const efx_dword_t *inbuf, size_t inlen)
static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
const efx_dword_t *inbuf, size_t inlen)
{
struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
efx_dword_t hdr[2];
@ -80,6 +80,11 @@ static void efx_mcdi_copyin(struct efx_nic *efx, unsigned cmd,
BUG_ON(atomic_read(&mcdi->state) == MCDI_STATE_QUIESCENT);
/* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
spin_lock_bh(&mcdi->iface_lock);
++mcdi->seqno;
spin_unlock_bh(&mcdi->iface_lock);
seqno = mcdi->seqno & SEQ_MASK;
xflags = 0;
if (mcdi->mode == MCDI_MODE_EVENTS)
@ -114,6 +119,8 @@ static void efx_mcdi_copyin(struct efx_nic *efx, unsigned cmd,
}
efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
mcdi->new_epoch = false;
}
static int efx_mcdi_errno(unsigned int mcdi_err)
@ -340,6 +347,22 @@ static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
efx_mcdi_complete(mcdi);
}
static int
efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
{
if (efx->type->mcdi_max_ver < 0 ||
(efx->type->mcdi_max_ver < 2 &&
cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
return -EINVAL;
if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
(efx->type->mcdi_max_ver < 2 &&
inlen > MCDI_CTL_SDU_LEN_MAX_V1))
return -EMSGSIZE;
return 0;
}
int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
const efx_dword_t *inbuf, size_t inlen,
efx_dword_t *outbuf, size_t outlen,
@ -358,26 +381,14 @@ int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
const efx_dword_t *inbuf, size_t inlen)
{
struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
int rc;
if (efx->type->mcdi_max_ver < 0 ||
(efx->type->mcdi_max_ver < 2 &&
cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
return -EINVAL;
if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
(efx->type->mcdi_max_ver < 2 &&
inlen > MCDI_CTL_SDU_LEN_MAX_V1))
return -EMSGSIZE;
rc = efx_mcdi_check_supported(efx, cmd, inlen);
if (rc)
return rc;
efx_mcdi_acquire(mcdi);
/* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
spin_lock_bh(&mcdi->iface_lock);
++mcdi->seqno;
spin_unlock_bh(&mcdi->iface_lock);
efx_mcdi_copyin(efx, cmd, inbuf, inlen);
mcdi->new_epoch = false;
efx_mcdi_send_request(efx, cmd, inbuf, inlen);
return 0;
}