| Message ID | 1493249935-30759-2-git-send-email-isubramanian@apm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 04/26/2017 04:38 PM, Iyappan Subramanian wrote: > From: Quan Nguyen <qnguyen@apm.com> > > This patch adds lock to protect indirect mac access sequence. > > Signed-off-by: Quan Nguyen <qnguyen@apm.com> > Signed-off-by: Iyappan Subramanian <isubramanian@apm.com> > --- > drivers/net/ethernet/apm/xgene/xgene_enet_hw.c | 2 ++ > drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 1 + > drivers/net/ethernet/apm/xgene/xgene_enet_main.h | 1 + > drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c | 7 ++++++- > drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c | 2 ++ > 5 files changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c > index 2a835e0..3697ba7 100644 > --- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c > +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c > @@ -365,9 +365,11 @@ static void xgene_enet_rd_mcx_mac(struct xgene_enet_pdata *pdata, > cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET; > cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET; > > + spin_lock(&pdata->mac_lock); > if (!xgene_enet_rd_indirect(addr, rd, cmd, cmd_done, rd_addr, rd_data)) > netdev_err(pdata->ndev, "MCX mac read failed, addr: %04x\n", > rd_addr); > + spin_unlock(&pdata->mac_lock); Why not fold the spinlock manipulation within xgenet_enet_rd_indirect()? That way the caller does not have to know that acquiring the spinlock is required and you avoid potential bugs in the future where you are missing the spinlock on indirect accesses?
On Wed, Apr 26, 2017 at 5:06 PM, Florian Fainelli <f.fainelli@gmail.com> wrote: > On 04/26/2017 04:38 PM, Iyappan Subramanian wrote: >> From: Quan Nguyen <qnguyen@apm.com> >> >> This patch adds lock to protect indirect mac access sequence. >> >> Signed-off-by: Quan Nguyen <qnguyen@apm.com> >> Signed-off-by: Iyappan Subramanian <isubramanian@apm.com> >> --- >> drivers/net/ethernet/apm/xgene/xgene_enet_hw.c | 2 ++ >> drivers/net/ethernet/apm/xgene/xgene_enet_main.c | 1 + >> drivers/net/ethernet/apm/xgene/xgene_enet_main.h | 1 + >> drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c | 7 ++++++- >> drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c | 2 ++ >> 5 files changed, 12 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c >> index 2a835e0..3697ba7 100644 >> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c >> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c >> @@ -365,9 +365,11 @@ static void xgene_enet_rd_mcx_mac(struct xgene_enet_pdata *pdata, >> cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET; >> cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET; >> >> + spin_lock(&pdata->mac_lock); >> if (!xgene_enet_rd_indirect(addr, rd, cmd, cmd_done, rd_addr, rd_data)) >> netdev_err(pdata->ndev, "MCX mac read failed, addr: %04x\n", >> rd_addr); >> + spin_unlock(&pdata->mac_lock); > > Why not fold the spinlock manipulation within xgenet_enet_rd_indirect()? > That way the caller does not have to know that acquiring the spinlock is > required and you avoid potential bugs in the future where you are > missing the spinlock on indirect accesses? Thanks. We'll do that and post the next version. > -- > Florian
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c index 2a835e0..3697ba7 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c @@ -365,9 +365,11 @@ static void xgene_enet_rd_mcx_mac(struct xgene_enet_pdata *pdata, cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET; cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET; + spin_lock(&pdata->mac_lock); if (!xgene_enet_rd_indirect(addr, rd, cmd, cmd_done, rd_addr, rd_data)) netdev_err(pdata->ndev, "MCX mac read failed, addr: %04x\n", rd_addr); + spin_unlock(&pdata->mac_lock); } static void xgene_gmac_set_mac_addr(struct xgene_enet_pdata *pdata) diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c index 5f37ed3..9a28ac3 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c @@ -2055,6 +2055,7 @@ static int xgene_enet_probe(struct platform_device *pdev) goto err; xgene_enet_setup_ops(pdata); + spin_lock_init(&pdata->mac_lock); if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { ndev->features |= NETIF_F_TSO | NETIF_F_RXCSUM; diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.h b/drivers/net/ethernet/apm/xgene/xgene_enet_main.h index 0d4be24..827b33d 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.h +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.h @@ -221,6 +221,7 @@ struct xgene_enet_pdata { struct xgene_enet_cle cle; struct rtnl_link_stats64 stats; const struct xgene_mac_ops *mac_ops; + spinlock_t mac_lock; /* mac lock */ const struct xgene_port_ops *port_ops; struct xgene_ring_ops *ring_ops; const struct xgene_cle_ops *cle_ops; diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c index a8e063b..4dd41f5 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c @@ -130,6 +130,7 @@ static u32 xgene_enet_rd_indirect(struct xgene_indirect_ctl *ctl, u32 rd_addr) static u32 xgene_enet_rd_mac(struct xgene_enet_pdata *p, u32 rd_addr) { + u32 val; struct xgene_indirect_ctl ctl = { .addr = p->mcx_mac_addr + MAC_ADDR_REG_OFFSET, .ctl = p->mcx_mac_addr + MAC_READ_REG_OFFSET, @@ -137,7 +138,11 @@ static u32 xgene_enet_rd_mac(struct xgene_enet_pdata *p, u32 rd_addr) .cmd_done = p->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET }; - return xgene_enet_rd_indirect(&ctl, rd_addr); + spin_lock(&p->mac_lock); + val = xgene_enet_rd_indirect(&ctl, rd_addr); + spin_unlock(&p->mac_lock); + + return val; } static int xgene_enet_ecc_init(struct xgene_enet_pdata *p) diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c b/drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c index 423240c..9a2d0ca 100644 --- a/drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c @@ -158,9 +158,11 @@ static void xgene_enet_rd_mac(struct xgene_enet_pdata *pdata, cmd = pdata->mcx_mac_addr + MAC_COMMAND_REG_OFFSET; cmd_done = pdata->mcx_mac_addr + MAC_COMMAND_DONE_REG_OFFSET; + spin_lock(&pdata->mac_lock); if (!xgene_enet_rd_indirect(addr, rd, cmd, cmd_done, rd_addr, rd_data)) netdev_err(pdata->ndev, "MCX mac read failed, addr: %04x\n", rd_addr); + spin_unlock(&pdata->mac_lock); } static bool xgene_enet_rd_pcs(struct xgene_enet_pdata *pdata,