diff options
| author |   Giuseppe Cavallaro <peppe.cavallaro@st.com> | 2016-02-29 14:27:35 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-03-02 14:21:32 -0500 |
| commit | be434d5075d6be0cda996200b2a20035e1565215 (patch) | |
| tree | c00deb31fdcdc2547ab67c84dbb9cfab718bdac9 /drivers/net/ethernet/stmicro/stmmac/enh_desc.c | |
| parent | stmmac: merge get_rx_owner into rx_status routine. (diff) | |
| download | linux-dev-be434d5075d6be0cda996200b2a20035e1565215.tar.xz linux-dev-be434d5075d6be0cda996200b2a20035e1565215.zip | |
stmmac: optimize tx desc management
This patch is to optimize the way to manage the TDES inside the
xmit function. When prepare the frame, some settings (e.g. OWN
bit) can be merged. This has been reworked to improve the tx
performances.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/enh_desc.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/enh_desc.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c index 1a2fce988548..1abd80ed09f3 100644 --- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c +++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c @@ -302,7 +302,8 @@ static void enh_desc_release_tx_desc(struct dma_desc *p, int mode) } static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len, - int csum_flag, int mode) + bool csum_flag, int mode, bool tx_own, + bool ls_ic) { unsigned int tdes0 = p->des0; @@ -316,6 +317,19 @@ static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len, else tdes0 &= ~(TX_CIC_FULL << ETDES0_CHECKSUM_INSERTION_SHIFT); + if (tx_own) + tdes0 |= ETDES0_OWN; + + if (is_fs & tx_own) + /* When the own bit, for the first frame, has to be set, all + * descriptors for the same frame has to be set before, to + * avoid race condition. + */ + wmb(); + + if (ls_ic) + tdes0 |= ETDES0_LAST_SEGMENT | ETDES0_INTERRUPT; + p->des0 = tdes0; if (mode == STMMAC_CHAIN_MODE) @@ -329,11 +343,6 @@ static void enh_desc_clear_tx_ic(struct dma_desc *p) p->des0 &= ~ETDES0_INTERRUPT; } -static void enh_desc_close_tx_desc(struct dma_desc *p) -{ - p->des0 |= ETDES0_LAST_SEGMENT | ETDES0_INTERRUPT; -} - static int enh_desc_get_rx_frame_len(struct dma_desc *p, int rx_coe_type) { unsigned int csum = 0; @@ -403,7 +412,6 @@ const struct stmmac_desc_ops enh_desc_ops = { .release_tx_desc = enh_desc_release_tx_desc, .prepare_tx_desc = enh_desc_prepare_tx_desc, .clear_tx_ic = enh_desc_clear_tx_ic, - .close_tx_desc = enh_desc_close_tx_desc, .get_tx_ls = enh_desc_get_tx_ls, .set_tx_owner = enh_desc_set_tx_owner, .set_rx_owner = enh_desc_set_rx_owner, |