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Date: Wed, 16 Oct 2013 17:24:11 +0200
From: Jimmy Perchet <jimmy.perchet@...rot.com>
To: <peppe.cavallaro@...com>
CC: <netdev@...r.kernel.org>, Jimmy Perchet <jimmy.perchet@...rot.com>
Subject: [PATCH RFC 4/5] net:stmmac: fix jumbo frame handling.
This patch addresses several issues which prevent jumbo frames from working properly :
.jumbo frames' last descriptor was not closed
.several confusion regarding descriptor's max buffer size
.frags could not be jumbo
Signed-off-by: Jimmy Perchet <jimmy.perchet@...rot.com>
---
drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 95 ++++++++----------
drivers/net/ethernet/stmicro/stmmac/common.h | 6 ++
drivers/net/ethernet/stmicro/stmmac/descs_com.h | 8 +-
drivers/net/ethernet/stmicro/stmmac/enh_desc.c | 6 ++
drivers/net/ethernet/stmicro/stmmac/norm_desc.c | 6 ++
drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 90 ++++++++---------
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 112 +++++++++++-----------
7 files changed, 158 insertions(+), 165 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
index d234ab5..d6ed0ce 100644
--- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c
@@ -28,70 +28,58 @@
#include "stmmac.h"
-static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
+static unsigned int stmmac_prepare_frm(void *p, void *data, unsigned int len,
+ int csum, unsigned int entry)
{
struct stmmac_priv *priv = (struct stmmac_priv *)p;
- unsigned int txsize = priv->dma_tx_size;
- unsigned int entry = priv->cur_tx % txsize;
- struct dma_desc *desc = priv->dma_tx + entry;
- unsigned int nopaged_len = skb_headlen(skb);
+ unsigned int entry_count = 0;
+ struct dma_desc *desc;
unsigned int bmax;
- unsigned int i = 1, len;
- if (priv->plat->enh_desc)
- bmax = BUF_SIZE_8KiB;
- else
- bmax = BUF_SIZE_2KiB;
-
- len = nopaged_len - bmax;
-
- desc->des2 = dma_map_single(priv->device, skb->data,
- bmax, DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, STMMAC_CHAIN_MODE);
-
- while (len != 0) {
- entry = (++priv->cur_tx) % txsize;
+ if (priv->plat->enh_desc) {
+ desc = (struct dma_desc *)(priv->dma_etx + entry);
+ bmax = BUF_SIZE_8KiB - 1;
+ } else{
desc = priv->dma_tx + entry;
-
- if (len > bmax) {
- desc->des2 = dma_map_single(priv->device,
- (skb->data + bmax * i),
- bmax, DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,
- STMMAC_CHAIN_MODE);
- priv->hw->desc->set_tx_owner(desc);
- priv->tx_skbuff[entry] = NULL;
- len -= bmax;
- i++;
- } else {
- desc->des2 = dma_map_single(priv->device,
- (skb->data + bmax * i), len,
- DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
- STMMAC_CHAIN_MODE);
- priv->hw->desc->set_tx_owner(desc);
- priv->tx_skbuff[entry] = NULL;
- len = 0;
- }
+ bmax = BUF_SIZE_2KiB - 1;
}
- return entry;
-}
-static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc)
-{
- unsigned int ret = 0;
+ while (len > bmax) {
+ desc->des2 = dma_map_single(priv->device,
+ data + bmax*entry_count,
+ bmax, DMA_TO_DEVICE);
+ priv->tx_skbuff_dma[entry] = desc->des2;
+ priv->tx_skbuff[entry] = NULL;
+ priv->hw->desc->prepare_tx_desc(desc, 0, bmax, csum,
+ STMMAC_CHAIN_MODE);
+
+ len -= bmax;
+ entry++;
+ entry %= priv->dma_tx_size;
+ entry_count++;
+
+ if (priv->plat->enh_desc)
+ desc = (struct dma_desc *)
+ (((struct dma_extended_desc *)desc)+1);
+ else
+ desc++;
+ }
- if ((enh_desc && (len > BUF_SIZE_8KiB)) ||
- (!enh_desc && (len > BUF_SIZE_2KiB))) {
- ret = 1;
+ if (len) {
+ desc->des2 = dma_map_single(priv->device,
+ data + bmax*entry_count,
+ len, DMA_TO_DEVICE);
+ priv->tx_skbuff_dma[entry] = desc->des2;
+ priv->tx_skbuff[entry] = NULL;
+ priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
+ STMMAC_CHAIN_MODE);
+ entry_count++;
}
- return ret;
+ return entry_count;
}
+
static void stmmac_init_dma_chain(void *des, dma_addr_t phy_addr,
unsigned int size, unsigned int extend_desc)
{
@@ -154,8 +142,7 @@ static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
const struct stmmac_chain_mode_ops chain_mode_ops = {
.init = stmmac_init_dma_chain,
- .is_jumbo_frm = stmmac_is_jumbo_frm,
- .jumbo_frm = stmmac_jumbo_frm,
+ .prepare_frm = stmmac_prepare_frm,
.refill_desc3 = stmmac_refill_desc3,
.clean_desc3 = stmmac_clean_desc3,
};
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 7eb8bab..5d3f734 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -323,6 +323,8 @@ struct stmmac_desc_ops {
/* Handle extra events on specific interrupts hw dependent */
int (*get_rx_owner) (struct dma_desc *p);
void (*set_rx_owner) (struct dma_desc *p);
+
+ void (*set_tx_first) (struct dma_desc *p);
/* Get the receive frame size */
int (*get_rx_frame_len) (struct dma_desc *p, int rx_coe_type);
/* Return the reception status looking at the RDES1 */
@@ -421,6 +423,8 @@ struct mii_regs {
struct stmmac_ring_mode_ops {
unsigned int (*is_jumbo_frm) (int len, int ehn_desc);
unsigned int (*jumbo_frm) (void *priv, struct sk_buff *skb, int csum);
+ unsigned int (*prepare_frm) (void *p, void *data, unsigned int len,
+ int csum, unsigned int entry);
void (*refill_desc3) (void *priv, struct dma_desc *p);
void (*init_desc3) (struct dma_desc *p);
void (*clean_desc3) (void *priv, struct dma_desc *p);
@@ -432,6 +436,8 @@ struct stmmac_chain_mode_ops {
unsigned int extend_desc);
unsigned int (*is_jumbo_frm) (int len, int ehn_desc);
unsigned int (*jumbo_frm) (void *priv, struct sk_buff *skb, int csum);
+ unsigned int (*prepare_frm) (void *p, void *data, unsigned int len,
+ int csum, unsigned int entry);
void (*refill_desc3) (void *priv, struct dma_desc *p);
void (*clean_desc3) (void *priv, struct dma_desc *p);
};
diff --git a/drivers/net/ethernet/stmicro/stmmac/descs_com.h b/drivers/net/ethernet/stmicro/stmmac/descs_com.h
index 6f2cc78..cf199d6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/descs_com.h
+++ b/drivers/net/ethernet/stmicro/stmmac/descs_com.h
@@ -53,9 +53,9 @@ static inline void enh_desc_end_tx_desc_on_ring(struct dma_desc *p, int ter)
static inline void enh_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
{
- if (unlikely(len > BUF_SIZE_4KiB)) {
- p->des01.etx.buffer1_size = BUF_SIZE_4KiB;
- p->des01.etx.buffer2_size = len - BUF_SIZE_4KiB;
+ if (unlikely(len >= BUF_SIZE_8KiB)) {
+ p->des01.etx.buffer1_size = BUF_SIZE_8KiB - 1;
+ p->des01.etx.buffer2_size = len - p->des01.etx.buffer1_size;
} else
p->des01.etx.buffer1_size = len;
}
@@ -81,7 +81,7 @@ static inline void ndesc_end_tx_desc_on_ring(struct dma_desc *p, int ter)
static inline void norm_set_tx_desc_len_on_ring(struct dma_desc *p, int len)
{
- if (unlikely(len > BUF_SIZE_2KiB)) {
+ if (unlikely(len >= BUF_SIZE_2KiB)) {
p->des01.etx.buffer1_size = BUF_SIZE_2KiB - 1;
p->des01.etx.buffer2_size = len - p->des01.etx.buffer1_size;
} else
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 7e6628a..915a7ab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -297,6 +297,11 @@ static void enh_desc_release_tx_desc(struct dma_desc *p, int mode)
enh_desc_end_tx_desc_on_ring(p, ter);
}
+static void enh_desc_set_tx_first(struct dma_desc *p)
+{
+ p->des01.etx.first_segment = 1;
+}
+
static void enh_desc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
int csum_flag, int mode)
{
@@ -393,6 +398,7 @@ const struct stmmac_desc_ops enh_desc_ops = {
.get_tx_ls = enh_desc_get_tx_ls,
.set_tx_owner = enh_desc_set_tx_owner,
.set_rx_owner = enh_desc_set_rx_owner,
+ .set_tx_first = enh_desc_set_tx_first,
.get_rx_frame_len = enh_desc_get_rx_frame_len,
.rx_extended_status = enh_desc_get_ext_status,
.enable_tx_timestamp = enh_desc_enable_tx_timestamp,
diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index 35ad4f4..6363776 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -180,6 +180,11 @@ static void ndesc_release_tx_desc(struct dma_desc *p, int mode)
ndesc_end_tx_desc_on_ring(p, ter);
}
+static void ndesc_set_tx_first(struct dma_desc *p)
+{
+ p->des01.etx.first_segment = 1;
+}
+
static void ndesc_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
int csum_flag, int mode)
{
@@ -265,6 +270,7 @@ const struct stmmac_desc_ops ndesc_ops = {
.get_tx_ls = ndesc_get_tx_ls,
.set_tx_owner = ndesc_set_tx_owner,
.set_rx_owner = ndesc_set_rx_owner,
+ .set_tx_first = ndesc_set_tx_first,
.get_rx_frame_len = ndesc_get_rx_frame_len,
.enable_tx_timestamp = ndesc_enable_tx_timestamp,
.get_tx_timestamp_status = ndesc_get_tx_timestamp_status,
diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
index 1ef9d8a..7faa42a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
+++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c
@@ -28,73 +28,60 @@
#include "stmmac.h"
-static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
+
+static unsigned int stmmac_prepare_frm(void *p, void *data, unsigned int len,
+ int csum, unsigned int entry)
{
struct stmmac_priv *priv = (struct stmmac_priv *)p;
- unsigned int txsize = priv->dma_tx_size;
- unsigned int entry = priv->cur_tx % txsize;
+ unsigned int entry_count = 0;
struct dma_desc *desc;
- unsigned int nopaged_len = skb_headlen(skb);
- unsigned int bmax, len;
+ unsigned int bmax;
- if (priv->extend_desc)
+ if (priv->plat->enh_desc) {
desc = (struct dma_desc *)(priv->dma_etx + entry);
- else
+ bmax = BUF_SIZE_8KiB - 1;
+ } else{
desc = priv->dma_tx + entry;
+ bmax = BUF_SIZE_2KiB - 1;
+ }
- if (priv->plat->enh_desc)
- bmax = BUF_SIZE_8KiB;
- else
- bmax = BUF_SIZE_2KiB;
-
- len = nopaged_len - bmax;
-
- if (nopaged_len > BUF_SIZE_8KiB) {
-
- desc->des2 = dma_map_single(priv->device, skb->data,
- bmax, DMA_TO_DEVICE);
+ while (len > 2*bmax) {
+ desc->des2 = dma_map_single(priv->device,
+ data + 2*bmax*entry_count,
+ 2*bmax, DMA_TO_DEVICE);
priv->tx_skbuff_dma[entry] = desc->des2;
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum,
+ priv->tx_skbuff[entry] = NULL;
+ desc->des3 = desc->des2 + bmax;
+ priv->hw->desc->prepare_tx_desc(desc, 0, 2*bmax, csum,
STMMAC_RING_MODE);
- wmb();
- entry = (++priv->cur_tx) % txsize;
- if (priv->extend_desc)
- desc = (struct dma_desc *)(priv->dma_etx + entry);
+ len -= 2*bmax;
+ entry++;
+ entry %= priv->dma_tx_size;
+ entry_count++;
+
+ if (priv->plat->enh_desc)
+ desc = (struct dma_desc *)
+ (((struct dma_extended_desc *)desc)+1);
else
- desc = priv->dma_tx + entry;
+ desc++;
+ }
+ if (len) {
- desc->des2 = dma_map_single(priv->device, skb->data + bmax,
- len, DMA_TO_DEVICE);
+ desc->des2 = dma_map_single(priv->device,
+ data + 2*bmax*entry_count,
+ len, DMA_TO_DEVICE);
priv->tx_skbuff_dma[entry] = desc->des2;
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
- STMMAC_RING_MODE);
- wmb();
- priv->hw->desc->set_tx_owner(desc);
priv->tx_skbuff[entry] = NULL;
- } else {
- desc->des2 = dma_map_single(priv->device, skb->data,
- nopaged_len, DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- desc->des3 = desc->des2 + BUF_SIZE_4KiB;
- priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum,
+ desc->des3 = desc->des2 + bmax;
+ priv->hw->desc->prepare_tx_desc(desc, 0, len, csum,
STMMAC_RING_MODE);
+ entry_count++;
}
- return entry;
+ return entry_count;
}
-static unsigned int stmmac_is_jumbo_frm(int len, int enh_desc)
-{
- unsigned int ret = 0;
-
- if (len >= BUF_SIZE_4KiB)
- ret = 1;
-
- return ret;
-}
static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)
{
@@ -103,13 +90,13 @@ static void stmmac_refill_desc3(void *priv_ptr, struct dma_desc *p)
if (unlikely(priv->plat->has_gmac))
/* Fill DES3 in case of RING mode */
if (priv->dma_buf_sz >= BUF_SIZE_8KiB)
- p->des3 = p->des2 + BUF_SIZE_8KiB;
+ p->des3 = p->des2 + BUF_SIZE_8KiB - 1;
}
/* In ring mode we need to fill the desc3 because it is used as buffer */
static void stmmac_init_desc3(struct dma_desc *p)
{
- p->des3 = p->des2 + BUF_SIZE_8KiB;
+ p->des3 = p->des2 + BUF_SIZE_8KiB - 1;
}
static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p)
@@ -127,8 +114,7 @@ static int stmmac_set_16kib_bfsize(int mtu)
}
const struct stmmac_ring_mode_ops ring_mode_ops = {
- .is_jumbo_frm = stmmac_is_jumbo_frm,
- .jumbo_frm = stmmac_jumbo_frm,
+ .prepare_frm = stmmac_prepare_frm,
.refill_desc3 = stmmac_refill_desc3,
.init_desc3 = stmmac_init_desc3,
.clean_desc3 = stmmac_clean_desc3,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index af04b5d..5873246 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1832,6 +1832,20 @@ static int stmmac_release(struct net_device *dev)
return 0;
}
+
+static struct dma_desc *get_desc(struct stmmac_priv *priv, unsigned int entry)
+{
+ struct dma_desc *desc;
+
+ if (priv->plat->enh_desc)
+ desc = (struct dma_desc *)(priv->dma_etx + entry);
+ else
+ desc = priv->dma_tx + entry;
+
+ return desc;
+}
+
+
/**
* stmmac_xmit: Tx entry point of the driver
* @skb : the socket buffer
@@ -1844,11 +1858,10 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct stmmac_priv *priv = netdev_priv(dev);
unsigned int txsize = priv->dma_tx_size;
- unsigned int entry;
- int i, csum_insertion = 0, is_jumbo = 0;
+ unsigned int entry, first_entry, nb_desc = 0;
+ int i, csum_insertion = 0;
int nfrags = skb_shinfo(skb)->nr_frags;
- struct dma_desc *desc, *first;
- unsigned int nopaged_len = skb_headlen(skb);
+ struct dma_desc *desc = NULL, *first;
if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
if (!netif_queue_stopped(dev)) {
@@ -1858,73 +1871,53 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
}
return NETDEV_TX_BUSY;
}
-
spin_lock(&priv->tx_lock);
if (priv->tx_path_in_lpi_mode)
stmmac_disable_eee_mode(priv);
- entry = priv->cur_tx % txsize;
+ first_entry = entry = priv->cur_tx % txsize;
csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
-
- if (priv->extend_desc)
- desc = (struct dma_desc *)(priv->dma_etx + entry);
+ /* To program the descriptors according to the size of the frame */
+ if (priv->mode == STMMAC_RING_MODE)
+ entry += priv->hw->ring->prepare_frm(priv, skb->data,
+ skb_headlen(skb), csum_insertion, entry);
else
- desc = priv->dma_tx + entry;
+ entry += priv->hw->chain->prepare_frm(priv, skb->data,
+ skb_headlen(skb), csum_insertion, entry);
- first = desc;
-
- priv->tx_skbuff[entry] = skb;
-
- /* To program the descriptors according to the size of the frame */
- if (priv->mode == STMMAC_RING_MODE) {
- is_jumbo = priv->hw->ring->is_jumbo_frm(skb->len,
- priv->plat->enh_desc);
- if (unlikely(is_jumbo))
- entry = priv->hw->ring->jumbo_frm(priv, skb,
- csum_insertion);
- } else {
- is_jumbo = priv->hw->chain->is_jumbo_frm(skb->len,
- priv->plat->enh_desc);
- if (unlikely(is_jumbo))
- entry = priv->hw->chain->jumbo_frm(priv, skb,
- csum_insertion);
- }
- if (likely(!is_jumbo)) {
- desc->des2 = dma_map_single(priv->device, skb->data,
- nopaged_len, DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
- csum_insertion, priv->mode);
- } else
- desc = first;
+ entry %= txsize;
for (i = 0; i < nfrags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
- int len = skb_frag_size(frag);
- entry = (++priv->cur_tx) % txsize;
- if (priv->extend_desc)
- desc = (struct dma_desc *)(priv->dma_etx + entry);
+ if (priv->mode == STMMAC_RING_MODE)
+ entry += priv->hw->ring->prepare_frm(priv,
+ skb_frag_address(frag),
+ skb_frag_size(frag),
+ csum_insertion, entry);
else
- desc = priv->dma_tx + entry;
-
- desc->des2 = skb_frag_dma_map(priv->device, frag, 0, len,
- DMA_TO_DEVICE);
- priv->tx_skbuff_dma[entry] = desc->des2;
- priv->tx_skbuff[entry] = NULL;
- priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion,
- priv->mode);
- wmb();
- priv->hw->desc->set_tx_owner(desc);
- wmb();
- }
-
+ entry += priv->hw->chain->prepare_frm(priv,
+ skb_frag_address(frag),
+ skb_frag_size(frag),
+ csum_insertion, entry);
+
+ entry %= txsize;
+ }
+ /*Set owner for all segment but the first one */
+ for (i = first_entry; i != entry;) {
+ desc = get_desc(priv, i);
+ nb_desc++;
+ if (i != first_entry)
+ priv->hw->desc->set_tx_owner(desc);
+ i++;
+ i %= txsize;
+ }
+ BUG_ON(desc == NULL);
/* Finalize the latest segment. */
priv->hw->desc->close_tx_desc(desc);
- wmb();
/* According to the coalesce parameter the IC bit for the latest
* segment could be reset and the timer re-started to invoke the
* stmmac_tx function. This approach takes care about the fragments.
@@ -1938,11 +1931,20 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
} else
priv->tx_count_frames = 0;
+ /*Prepare first segment */
+ priv->tx_skbuff[first_entry] = skb;
+
+ first = get_desc(priv, first_entry);
+
+ priv->hw->desc->set_tx_first(first);
+
+ wmb();
+
/* To avoid raise condition */
priv->hw->desc->set_tx_owner(first);
wmb();
- priv->cur_tx++;
+ priv->cur_tx += nb_desc;
if (netif_msg_pktdata(priv)) {
pr_debug("%s: curr %d dirty=%d entry=%d, first=%p, nfrags=%d",
--
1.8.1.2
--
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