evie/android_kernel_oneplus_msm8998
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Merge "msm: ipa3: linearize large skbs"

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Linux Build Service Account 2016-11-18 01:55:00 -08:00 • committed by Gerrit - the friendly Code Review server
commit a708ddf420
1 changed files with 37 additions and 22 deletions
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59
drivers/platform/msm/ipa/ipa_v3/ipa_dp.c
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@ -1723,6 +1723,7 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
struct ipa3_sys_context *sys;
int src_ep_idx;
int num_frags, f;
struct ipa_gsi_ep_config *gsi_ep;
if (unlikely(!ipa3_ctx)) {
IPAERR("IPA3 driver was not initialized\n");
@ -1734,23 +1735,6 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
return -EINVAL;
}
num_frags = skb_shinfo(skb)->nr_frags;
if (num_frags) {
/* 1 desc for tag to resolve status out-of-order issue;
* 1 desc is needed for the linear portion of skb;
* 1 desc may be needed for the PACKET_INIT;
* 1 desc for each frag
*/
desc = kzalloc(sizeof(*desc) * (num_frags + 3), GFP_ATOMIC);
if (!desc) {
IPAERR("failed to alloc desc array\n");
goto fail_mem;
}
} else {
memset(_desc, 0, 3 * sizeof(struct ipa3_desc));
desc = &_desc[0];
}
/*
* USB_CONS: PKT_INIT ep_idx = dst pipe
* Q6_CONS: PKT_INIT ep_idx = sender pipe
@ -1787,6 +1771,37 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
goto fail_gen;
}
num_frags = skb_shinfo(skb)->nr_frags;
/*
* make sure TLV FIFO supports the needed frags.
* 2 descriptors are needed for IP_PACKET_INIT and TAG_STATUS.
* 1 descriptor needed for the linear portion of skb.
*/
gsi_ep = ipa3_get_gsi_ep_info(src_ep_idx);
if (gsi_ep && (num_frags + 3 > gsi_ep->ipa_if_tlv)) {
if (skb_linearize(skb)) {
IPAERR("Failed to linear skb with %d frags\n",
num_frags);
goto fail_gen;
}
num_frags = 0;
}
if (num_frags) {
/* 1 desc for tag to resolve status out-of-order issue;
* 1 desc is needed for the linear portion of skb;
* 1 desc may be needed for the PACKET_INIT;
* 1 desc for each frag
*/
desc = kzalloc(sizeof(*desc) * (num_frags + 3), GFP_ATOMIC);
if (!desc) {
IPAERR("failed to alloc desc array\n");
goto fail_gen;
}
} else {
memset(_desc, 0, 3 * sizeof(struct ipa3_desc));
desc = &_desc[0];
}
if (dst_ep_idx != -1) {
/* SW data path */
cmd.destination_pipe_index = dst_ep_idx;
@ -1794,7 +1809,7 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
IPA_IMM_CMD_IP_PACKET_INIT, &cmd, true);
if (unlikely(!cmd_pyld)) {
IPAERR("failed to construct ip_packet_init imm cmd\n");
goto fail_gen;
goto fail_mem;
}
/* the tag field will be populated in ipa3_send() function */
@ -1863,7 +1878,7 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
if (num_frags == 0) {
if (ipa3_send(sys, 2, desc, true)) {
IPAERR("fail to send skb %p HWP\n", skb);
goto fail_gen;
goto fail_mem;
}
} else {
for (f = 0; f < num_frags; f++) {
@ -1880,7 +1895,7 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
if (ipa3_send(sys, num_frags + 2, desc, true)) {
IPAERR("fail to send skb %p num_frags %u HWP\n",
skb, num_frags);
goto fail_gen;
goto fail_mem;
}
}
IPA_STATS_INC_CNT(ipa3_ctx->stats.tx_hw_pkts);
@ -1894,10 +1909,10 @@ int ipa3_tx_dp(enum ipa_client_type dst, struct sk_buff *skb,
fail_send:
ipahal_destroy_imm_cmd(cmd_pyld);
fail_gen:
fail_mem:
if (num_frags)
kfree(desc);
fail_mem:
fail_gen:
return -EFAULT;
}